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numam-spdk/lib/bdev/bdev.c
Shuhei Matsumoto 11d3806efb lib/bdev: Remove inclusion of SPDK event library 
Remove inclusion of spdk/event.h from lib/bdev/bdev.c. Its dependency
had been removed before.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: Icfea104b20172e624574506a41fa92524ebc8627
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2690
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
2020-06-01 09:20:41 +00:00

6438 lines
175 KiB
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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation. All rights reserved.
* Copyright (c) 2019 Mellanox Technologies LTD. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/stdinc.h"
#include "spdk/bdev.h"
#include "spdk/conf.h"
#include "spdk/config.h"
#include "spdk/env.h"
#include "spdk/thread.h"
#include "spdk/likely.h"
#include "spdk/queue.h"
#include "spdk/nvme_spec.h"
#include "spdk/scsi_spec.h"
#include "spdk/notify.h"
#include "spdk/util.h"
#include "spdk/trace.h"
#include "spdk/bdev_module.h"
#include "spdk_internal/log.h"
#include "spdk/string.h"
#include "bdev_internal.h"
#ifdef SPDK_CONFIG_VTUNE
#include "ittnotify.h"
#include "ittnotify_types.h"
int __itt_init_ittlib(const char *, __itt_group_id);
#endif
#define SPDK_BDEV_IO_POOL_SIZE (64 * 1024 - 1)
#define SPDK_BDEV_IO_CACHE_SIZE 256
#define SPDK_BDEV_AUTO_EXAMINE true
#define BUF_SMALL_POOL_SIZE 8191
#define BUF_LARGE_POOL_SIZE 1023
#define NOMEM_THRESHOLD_COUNT 8
#define ZERO_BUFFER_SIZE 0x100000
#define OWNER_BDEV 0x2
#define OBJECT_BDEV_IO 0x2
#define TRACE_GROUP_BDEV 0x3
#define TRACE_BDEV_IO_START SPDK_TPOINT_ID(TRACE_GROUP_BDEV, 0x0)
#define TRACE_BDEV_IO_DONE SPDK_TPOINT_ID(TRACE_GROUP_BDEV, 0x1)
#define SPDK_BDEV_QOS_TIMESLICE_IN_USEC 1000
#define SPDK_BDEV_QOS_MIN_IO_PER_TIMESLICE 1
#define SPDK_BDEV_QOS_MIN_BYTE_PER_TIMESLICE 512
#define SPDK_BDEV_QOS_MIN_IOS_PER_SEC 1000
#define SPDK_BDEV_QOS_MIN_BYTES_PER_SEC (1024 * 1024)
#define SPDK_BDEV_QOS_LIMIT_NOT_DEFINED UINT64_MAX
#define SPDK_BDEV_IO_POLL_INTERVAL_IN_MSEC 1000
#define SPDK_BDEV_POOL_ALIGNMENT 512
static const char *qos_conf_type[] = {"Limit_IOPS",
"Limit_BPS", "Limit_Read_BPS", "Limit_Write_BPS"
};
static const char *qos_rpc_type[] = {"rw_ios_per_sec",
"rw_mbytes_per_sec", "r_mbytes_per_sec", "w_mbytes_per_sec"
};
TAILQ_HEAD(spdk_bdev_list, spdk_bdev);
struct spdk_bdev_mgr {
struct spdk_mempool *bdev_io_pool;
struct spdk_mempool *buf_small_pool;
struct spdk_mempool *buf_large_pool;
void *zero_buffer;
TAILQ_HEAD(bdev_module_list, spdk_bdev_module) bdev_modules;
struct spdk_bdev_list bdevs;
bool init_complete;
bool module_init_complete;
pthread_mutex_t mutex;
#ifdef SPDK_CONFIG_VTUNE
__itt_domain *domain;
#endif
};
static struct spdk_bdev_mgr g_bdev_mgr = {
.bdev_modules = TAILQ_HEAD_INITIALIZER(g_bdev_mgr.bdev_modules),
.bdevs = TAILQ_HEAD_INITIALIZER(g_bdev_mgr.bdevs),
.init_complete = false,
.module_init_complete = false,
.mutex = PTHREAD_MUTEX_INITIALIZER,
};
typedef void (*lock_range_cb)(void *ctx, int status);
struct lba_range {
uint64_t offset;
uint64_t length;
void *locked_ctx;
struct spdk_bdev_channel *owner_ch;
TAILQ_ENTRY(lba_range) tailq;
};
static struct spdk_bdev_opts g_bdev_opts = {
.bdev_io_pool_size = SPDK_BDEV_IO_POOL_SIZE,
.bdev_io_cache_size = SPDK_BDEV_IO_CACHE_SIZE,
.bdev_auto_examine = SPDK_BDEV_AUTO_EXAMINE,
};
static spdk_bdev_init_cb g_init_cb_fn = NULL;
static void *g_init_cb_arg = NULL;
static spdk_bdev_fini_cb g_fini_cb_fn = NULL;
static void *g_fini_cb_arg = NULL;
static struct spdk_thread *g_fini_thread = NULL;
struct spdk_bdev_qos_limit {
/** IOs or bytes allowed per second (i.e., 1s). */
uint64_t limit;
/** Remaining IOs or bytes allowed in current timeslice (e.g., 1ms).
* For remaining bytes, allowed to run negative if an I/O is submitted when
* some bytes are remaining, but the I/O is bigger than that amount. The
* excess will be deducted from the next timeslice.
*/
int64_t remaining_this_timeslice;
/** Minimum allowed IOs or bytes to be issued in one timeslice (e.g., 1ms). */
uint32_t min_per_timeslice;
/** Maximum allowed IOs or bytes to be issued in one timeslice (e.g., 1ms). */
uint32_t max_per_timeslice;
/** Function to check whether to queue the IO. */
bool (*queue_io)(const struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io);
/** Function to update for the submitted IO. */
void (*update_quota)(struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io);
};
struct spdk_bdev_qos {
/** Types of structure of rate limits. */
struct spdk_bdev_qos_limit rate_limits[SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES];
/** The channel that all I/O are funneled through. */
struct spdk_bdev_channel *ch;
/** The thread on which the poller is running. */
struct spdk_thread *thread;
/** Queue of I/O waiting to be issued. */
bdev_io_tailq_t queued;
/** Size of a timeslice in tsc ticks. */
uint64_t timeslice_size;
/** Timestamp of start of last timeslice. */
uint64_t last_timeslice;
/** Poller that processes queued I/O commands each time slice. */
struct spdk_poller *poller;
};
struct spdk_bdev_mgmt_channel {
bdev_io_stailq_t need_buf_small;
bdev_io_stailq_t need_buf_large;
/*
* Each thread keeps a cache of bdev_io - this allows
* bdev threads which are *not* DPDK threads to still
* benefit from a per-thread bdev_io cache. Without
* this, non-DPDK threads fetching from the mempool
* incur a cmpxchg on get and put.
*/
bdev_io_stailq_t per_thread_cache;
uint32_t per_thread_cache_count;
uint32_t bdev_io_cache_size;
TAILQ_HEAD(, spdk_bdev_shared_resource) shared_resources;
TAILQ_HEAD(, spdk_bdev_io_wait_entry) io_wait_queue;
};
/*
* Per-module (or per-io_device) data. Multiple bdevs built on the same io_device
* will queue here their IO that awaits retry. It makes it possible to retry sending
* IO to one bdev after IO from other bdev completes.
*/
struct spdk_bdev_shared_resource {
/* The bdev management channel */
struct spdk_bdev_mgmt_channel *mgmt_ch;
/*
* Count of I/O submitted to bdev module and waiting for completion.
* Incremented before submit_request() is called on an spdk_bdev_io.
*/
uint64_t io_outstanding;
/*
* Queue of IO awaiting retry because of a previous NOMEM status returned
* on this channel.
*/
bdev_io_tailq_t nomem_io;
/*
* Threshold which io_outstanding must drop to before retrying nomem_io.
*/
uint64_t nomem_threshold;
/* I/O channel allocated by a bdev module */
struct spdk_io_channel *shared_ch;
/* Refcount of bdev channels using this resource */
uint32_t ref;
TAILQ_ENTRY(spdk_bdev_shared_resource) link;
};
#define BDEV_CH_RESET_IN_PROGRESS (1 << 0)
#define BDEV_CH_QOS_ENABLED (1 << 1)
struct spdk_bdev_channel {
struct spdk_bdev *bdev;
/* The channel for the underlying device */
struct spdk_io_channel *channel;
/* Per io_device per thread data */
struct spdk_bdev_shared_resource *shared_resource;
struct spdk_bdev_io_stat stat;
/*
* Count of I/O submitted to the underlying dev module through this channel
* and waiting for completion.
*/
uint64_t io_outstanding;
/*
* List of spdk_bdev_io directly associated with a call to the public bdev API.
* It does not include any spdk_bdev_io that are generated via splitting.
*/
bdev_io_tailq_t io_submitted;
/*
* List of spdk_bdev_io that are currently queued because they write to a locked
* LBA range.
*/
bdev_io_tailq_t io_locked;
uint32_t flags;
struct spdk_histogram_data *histogram;
#ifdef SPDK_CONFIG_VTUNE
uint64_t start_tsc;
uint64_t interval_tsc;
__itt_string_handle *handle;
struct spdk_bdev_io_stat prev_stat;
#endif
bdev_io_tailq_t queued_resets;
lba_range_tailq_t locked_ranges;
};
struct media_event_entry {
struct spdk_bdev_media_event event;
TAILQ_ENTRY(media_event_entry) tailq;
};
#define MEDIA_EVENT_POOL_SIZE 64
struct spdk_bdev_desc {
struct spdk_bdev *bdev;
struct spdk_thread *thread;
struct {
bool open_with_ext;
union {
spdk_bdev_remove_cb_t remove_fn;
spdk_bdev_event_cb_t event_fn;
};
void *ctx;
} callback;
bool closed;
bool write;
pthread_mutex_t mutex;
uint32_t refs;
TAILQ_HEAD(, media_event_entry) pending_media_events;
TAILQ_HEAD(, media_event_entry) free_media_events;
struct media_event_entry *media_events_buffer;
TAILQ_ENTRY(spdk_bdev_desc) link;
uint64_t timeout_in_sec;
spdk_bdev_io_timeout_cb cb_fn;
void *cb_arg;
struct spdk_poller *io_timeout_poller;
};
struct spdk_bdev_iostat_ctx {
struct spdk_bdev_io_stat *stat;
spdk_bdev_get_device_stat_cb cb;
void *cb_arg;
};
struct set_qos_limit_ctx {
void (*cb_fn)(void *cb_arg, int status);
void *cb_arg;
struct spdk_bdev *bdev;
};
#define __bdev_to_io_dev(bdev) (((char *)bdev) + 1)
#define __bdev_from_io_dev(io_dev) ((struct spdk_bdev *)(((char *)io_dev) - 1))
static void bdev_write_zero_buffer_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg);
static void bdev_write_zero_buffer_next(void *_bdev_io);
static void bdev_enable_qos_msg(struct spdk_io_channel_iter *i);
static void bdev_enable_qos_done(struct spdk_io_channel_iter *i, int status);
static int
bdev_readv_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf, uint64_t offset_blocks,
uint64_t num_blocks, spdk_bdev_io_completion_cb cb, void *cb_arg);
static int
bdev_writev_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg);
static int
bdev_lock_lba_range(struct spdk_bdev_desc *desc, struct spdk_io_channel *_ch,
uint64_t offset, uint64_t length,
lock_range_cb cb_fn, void *cb_arg);
static int
bdev_unlock_lba_range(struct spdk_bdev_desc *desc, struct spdk_io_channel *_ch,
uint64_t offset, uint64_t length,
lock_range_cb cb_fn, void *cb_arg);
void
spdk_bdev_get_opts(struct spdk_bdev_opts *opts)
{
*opts = g_bdev_opts;
}
int
spdk_bdev_set_opts(struct spdk_bdev_opts *opts)
{
uint32_t min_pool_size;
/*
* Add 1 to the thread count to account for the extra mgmt_ch that gets created during subsystem
* initialization. A second mgmt_ch will be created on the same thread when the application starts
* but before the deferred put_io_channel event is executed for the first mgmt_ch.
*/
min_pool_size = opts->bdev_io_cache_size * (spdk_thread_get_count() + 1);
if (opts->bdev_io_pool_size < min_pool_size) {
SPDK_ERRLOG("bdev_io_pool_size %" PRIu32 " is not compatible with bdev_io_cache_size %" PRIu32
" and %" PRIu32 " threads\n", opts->bdev_io_pool_size, opts->bdev_io_cache_size,
spdk_thread_get_count());
SPDK_ERRLOG("bdev_io_pool_size must be at least %" PRIu32 "\n", min_pool_size);
return -1;
}
g_bdev_opts = *opts;
return 0;
}
/*
* Will implement the whitelist in the furture
*/
static inline bool
bdev_in_examine_whitelist(struct spdk_bdev *bdev)
{
return false;
}
static inline bool
bdev_ok_to_examine(struct spdk_bdev *bdev)
{
if (g_bdev_opts.bdev_auto_examine) {
return true;
} else {
return bdev_in_examine_whitelist(bdev);
}
}
struct spdk_bdev *
spdk_bdev_first(void)
{
struct spdk_bdev *bdev;
bdev = TAILQ_FIRST(&g_bdev_mgr.bdevs);
if (bdev) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Starting bdev iteration at %s\n", bdev->name);
}
return bdev;
}
struct spdk_bdev *
spdk_bdev_next(struct spdk_bdev *prev)
{
struct spdk_bdev *bdev;
bdev = TAILQ_NEXT(prev, internal.link);
if (bdev) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Continuing bdev iteration at %s\n", bdev->name);
}
return bdev;
}
static struct spdk_bdev *
_bdev_next_leaf(struct spdk_bdev *bdev)
{
while (bdev != NULL) {
if (bdev->internal.claim_module == NULL) {
return bdev;
} else {
bdev = TAILQ_NEXT(bdev, internal.link);
}
}
return bdev;
}
struct spdk_bdev *
spdk_bdev_first_leaf(void)
{
struct spdk_bdev *bdev;
bdev = _bdev_next_leaf(TAILQ_FIRST(&g_bdev_mgr.bdevs));
if (bdev) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Starting bdev iteration at %s\n", bdev->name);
}
return bdev;
}
struct spdk_bdev *
spdk_bdev_next_leaf(struct spdk_bdev *prev)
{
struct spdk_bdev *bdev;
bdev = _bdev_next_leaf(TAILQ_NEXT(prev, internal.link));
if (bdev) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Continuing bdev iteration at %s\n", bdev->name);
}
return bdev;
}
struct spdk_bdev *
spdk_bdev_get_by_name(const char *bdev_name)
{
struct spdk_bdev_alias *tmp;
struct spdk_bdev *bdev = spdk_bdev_first();
while (bdev != NULL) {
if (strcmp(bdev_name, bdev->name) == 0) {
return bdev;
}
TAILQ_FOREACH(tmp, &bdev->aliases, tailq) {
if (strcmp(bdev_name, tmp->alias) == 0) {
return bdev;
}
}
bdev = spdk_bdev_next(bdev);
}
return NULL;
}
void
spdk_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len)
{
struct iovec *iovs;
if (bdev_io->u.bdev.iovs == NULL) {
bdev_io->u.bdev.iovs = &bdev_io->iov;
bdev_io->u.bdev.iovcnt = 1;
}
iovs = bdev_io->u.bdev.iovs;
assert(iovs != NULL);
assert(bdev_io->u.bdev.iovcnt >= 1);
iovs[0].iov_base = buf;
iovs[0].iov_len = len;
}
void
spdk_bdev_io_set_md_buf(struct spdk_bdev_io *bdev_io, void *md_buf, size_t len)
{
assert((len / spdk_bdev_get_md_size(bdev_io->bdev)) >= bdev_io->u.bdev.num_blocks);
bdev_io->u.bdev.md_buf = md_buf;
}
static bool
_is_buf_allocated(const struct iovec *iovs)
{
if (iovs == NULL) {
return false;
}
return iovs[0].iov_base != NULL;
}
static bool
_are_iovs_aligned(struct iovec *iovs, int iovcnt, uint32_t alignment)
{
int i;
uintptr_t iov_base;
if (spdk_likely(alignment == 1)) {
return true;
}
for (i = 0; i < iovcnt; i++) {
iov_base = (uintptr_t)iovs[i].iov_base;
if ((iov_base & (alignment - 1)) != 0) {
return false;
}
}
return true;
}
static void
_copy_iovs_to_buf(void *buf, size_t buf_len, struct iovec *iovs, int iovcnt)
{
int i;
size_t len;
for (i = 0; i < iovcnt; i++) {
len = spdk_min(iovs[i].iov_len, buf_len);
memcpy(buf, iovs[i].iov_base, len);
buf += len;
buf_len -= len;
}
}
static void
_copy_buf_to_iovs(struct iovec *iovs, int iovcnt, void *buf, size_t buf_len)
{
int i;
size_t len;
for (i = 0; i < iovcnt; i++) {
len = spdk_min(iovs[i].iov_len, buf_len);
memcpy(iovs[i].iov_base, buf, len);
buf += len;
buf_len -= len;
}
}
static void
_bdev_io_set_bounce_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len)
{
/* save original iovec */
bdev_io->internal.orig_iovs = bdev_io->u.bdev.iovs;
bdev_io->internal.orig_iovcnt = bdev_io->u.bdev.iovcnt;
/* set bounce iov */
bdev_io->u.bdev.iovs = &bdev_io->internal.bounce_iov;
bdev_io->u.bdev.iovcnt = 1;
/* set bounce buffer for this operation */
bdev_io->u.bdev.iovs[0].iov_base = buf;
bdev_io->u.bdev.iovs[0].iov_len = len;
/* if this is write path, copy data from original buffer to bounce buffer */
if (bdev_io->type == SPDK_BDEV_IO_TYPE_WRITE) {
_copy_iovs_to_buf(buf, len, bdev_io->internal.orig_iovs, bdev_io->internal.orig_iovcnt);
}
}
static void
_bdev_io_set_bounce_md_buf(struct spdk_bdev_io *bdev_io, void *md_buf, size_t len)
{
/* save original md_buf */
bdev_io->internal.orig_md_buf = bdev_io->u.bdev.md_buf;
/* set bounce md_buf */
bdev_io->u.bdev.md_buf = md_buf;
if (bdev_io->type == SPDK_BDEV_IO_TYPE_WRITE) {
memcpy(md_buf, bdev_io->internal.orig_md_buf, len);
}
}
static void
bdev_io_get_buf_complete(struct spdk_bdev_io *bdev_io, void *buf, bool status)
{
struct spdk_io_channel *ch = spdk_bdev_io_get_io_channel(bdev_io);
if (spdk_unlikely(bdev_io->internal.get_aux_buf_cb != NULL)) {
bdev_io->internal.get_aux_buf_cb(ch, bdev_io, buf);
bdev_io->internal.get_aux_buf_cb = NULL;
} else {
assert(bdev_io->internal.get_buf_cb != NULL);
bdev_io->internal.buf = buf;
bdev_io->internal.get_buf_cb(ch, bdev_io, status);
bdev_io->internal.get_buf_cb = NULL;
}
}
static void
_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, uint64_t len)
{
struct spdk_bdev *bdev = bdev_io->bdev;
bool buf_allocated;
uint64_t md_len, alignment;
void *aligned_buf;
if (spdk_unlikely(bdev_io->internal.get_aux_buf_cb != NULL)) {
bdev_io_get_buf_complete(bdev_io, buf, true);
return;
}
alignment = spdk_bdev_get_buf_align(bdev);
buf_allocated = _is_buf_allocated(bdev_io->u.bdev.iovs);
aligned_buf = (void *)(((uintptr_t)buf + (alignment - 1)) & ~(alignment - 1));
if (buf_allocated) {
_bdev_io_set_bounce_buf(bdev_io, aligned_buf, len);
} else {
spdk_bdev_io_set_buf(bdev_io, aligned_buf, len);
}
if (spdk_bdev_is_md_separate(bdev)) {
aligned_buf = (char *)aligned_buf + len;
md_len = bdev_io->u.bdev.num_blocks * bdev->md_len;
assert(((uintptr_t)aligned_buf & (alignment - 1)) == 0);
if (bdev_io->u.bdev.md_buf != NULL) {
_bdev_io_set_bounce_md_buf(bdev_io, aligned_buf, md_len);
} else {
spdk_bdev_io_set_md_buf(bdev_io, aligned_buf, md_len);
}
}
bdev_io_get_buf_complete(bdev_io, buf, true);
}
static void
_bdev_io_put_buf(struct spdk_bdev_io *bdev_io, void *buf, uint64_t buf_len)
{
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_mempool *pool;
struct spdk_bdev_io *tmp;
bdev_io_stailq_t *stailq;
struct spdk_bdev_mgmt_channel *ch;
uint64_t md_len, alignment;
md_len = spdk_bdev_is_md_separate(bdev) ? bdev_io->u.bdev.num_blocks * bdev->md_len : 0;
alignment = spdk_bdev_get_buf_align(bdev);
ch = bdev_io->internal.ch->shared_resource->mgmt_ch;
if (buf_len + alignment + md_len <= SPDK_BDEV_BUF_SIZE_WITH_MD(SPDK_BDEV_SMALL_BUF_MAX_SIZE) +
SPDK_BDEV_POOL_ALIGNMENT) {
pool = g_bdev_mgr.buf_small_pool;
stailq = &ch->need_buf_small;
} else {
pool = g_bdev_mgr.buf_large_pool;
stailq = &ch->need_buf_large;
}
if (STAILQ_EMPTY(stailq)) {
spdk_mempool_put(pool, buf);
} else {
tmp = STAILQ_FIRST(stailq);
STAILQ_REMOVE_HEAD(stailq, internal.buf_link);
_bdev_io_set_buf(tmp, buf, tmp->internal.buf_len);
}
}
static void
bdev_io_put_buf(struct spdk_bdev_io *bdev_io)
{
assert(bdev_io->internal.buf != NULL);
_bdev_io_put_buf(bdev_io, bdev_io->internal.buf, bdev_io->internal.buf_len);
bdev_io->internal.buf = NULL;
}
void
spdk_bdev_io_put_aux_buf(struct spdk_bdev_io *bdev_io, void *buf)
{
uint64_t len = bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
assert(buf != NULL);
_bdev_io_put_buf(bdev_io, buf, len);
}
static void
_bdev_io_unset_bounce_buf(struct spdk_bdev_io *bdev_io)
{
if (spdk_likely(bdev_io->internal.orig_iovcnt == 0)) {
assert(bdev_io->internal.orig_md_buf == NULL);
return;
}
/* if this is read path, copy data from bounce buffer to original buffer */
if (bdev_io->type == SPDK_BDEV_IO_TYPE_READ &&
bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS) {
_copy_buf_to_iovs(bdev_io->internal.orig_iovs,
bdev_io->internal.orig_iovcnt,
bdev_io->internal.bounce_iov.iov_base,
bdev_io->internal.bounce_iov.iov_len);
}
/* set original buffer for this io */
bdev_io->u.bdev.iovcnt = bdev_io->internal.orig_iovcnt;
bdev_io->u.bdev.iovs = bdev_io->internal.orig_iovs;
/* disable bouncing buffer for this io */
bdev_io->internal.orig_iovcnt = 0;
bdev_io->internal.orig_iovs = NULL;
/* do the same for metadata buffer */
if (spdk_unlikely(bdev_io->internal.orig_md_buf != NULL)) {
assert(spdk_bdev_is_md_separate(bdev_io->bdev));
if (bdev_io->type == SPDK_BDEV_IO_TYPE_READ &&
bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS) {
memcpy(bdev_io->internal.orig_md_buf, bdev_io->u.bdev.md_buf,
bdev_io->u.bdev.num_blocks * spdk_bdev_get_md_size(bdev_io->bdev));
}
bdev_io->u.bdev.md_buf = bdev_io->internal.orig_md_buf;
bdev_io->internal.orig_md_buf = NULL;
}
/* We want to free the bounce buffer here since we know we're done with it (as opposed
* to waiting for the conditional free of internal.buf in spdk_bdev_free_io()).
*/
bdev_io_put_buf(bdev_io);
}
static void
bdev_io_get_buf(struct spdk_bdev_io *bdev_io, uint64_t len)
{
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_mempool *pool;
bdev_io_stailq_t *stailq;
struct spdk_bdev_mgmt_channel *mgmt_ch;
uint64_t alignment, md_len;
void *buf;
alignment = spdk_bdev_get_buf_align(bdev);
md_len = spdk_bdev_is_md_separate(bdev) ? bdev_io->u.bdev.num_blocks * bdev->md_len : 0;
if (len + alignment + md_len > SPDK_BDEV_BUF_SIZE_WITH_MD(SPDK_BDEV_LARGE_BUF_MAX_SIZE) +
SPDK_BDEV_POOL_ALIGNMENT) {
SPDK_ERRLOG("Length + alignment %" PRIu64 " is larger than allowed\n",
len + alignment);
bdev_io_get_buf_complete(bdev_io, NULL, false);
return;
}
mgmt_ch = bdev_io->internal.ch->shared_resource->mgmt_ch;
bdev_io->internal.buf_len = len;
if (len + alignment + md_len <= SPDK_BDEV_BUF_SIZE_WITH_MD(SPDK_BDEV_SMALL_BUF_MAX_SIZE) +
SPDK_BDEV_POOL_ALIGNMENT) {
pool = g_bdev_mgr.buf_small_pool;
stailq = &mgmt_ch->need_buf_small;
} else {
pool = g_bdev_mgr.buf_large_pool;
stailq = &mgmt_ch->need_buf_large;
}
buf = spdk_mempool_get(pool);
if (!buf) {
STAILQ_INSERT_TAIL(stailq, bdev_io, internal.buf_link);
} else {
_bdev_io_set_buf(bdev_io, buf, len);
}
}
void
spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb, uint64_t len)
{
struct spdk_bdev *bdev = bdev_io->bdev;
uint64_t alignment;
assert(cb != NULL);
bdev_io->internal.get_buf_cb = cb;
alignment = spdk_bdev_get_buf_align(bdev);
if (_is_buf_allocated(bdev_io->u.bdev.iovs) &&
_are_iovs_aligned(bdev_io->u.bdev.iovs, bdev_io->u.bdev.iovcnt, alignment)) {
/* Buffer already present and aligned */
cb(spdk_bdev_io_get_io_channel(bdev_io), bdev_io, true);
return;
}
bdev_io_get_buf(bdev_io, len);
}
void
spdk_bdev_io_get_aux_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_aux_buf_cb cb)
{
uint64_t len = bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
assert(cb != NULL);
assert(bdev_io->internal.get_aux_buf_cb == NULL);
bdev_io->internal.get_aux_buf_cb = cb;
bdev_io_get_buf(bdev_io, len);
}
static int
bdev_module_get_max_ctx_size(void)
{
struct spdk_bdev_module *bdev_module;
int max_bdev_module_size = 0;
TAILQ_FOREACH(bdev_module, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (bdev_module->get_ctx_size && bdev_module->get_ctx_size() > max_bdev_module_size) {
max_bdev_module_size = bdev_module->get_ctx_size();
}
}
return max_bdev_module_size;
}
void
spdk_bdev_config_text(FILE *fp)
{
struct spdk_bdev_module *bdev_module;
TAILQ_FOREACH(bdev_module, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (bdev_module->config_text) {
bdev_module->config_text(fp);
}
}
}
static void
bdev_qos_config_json(struct spdk_bdev *bdev, struct spdk_json_write_ctx *w)
{
int i;
struct spdk_bdev_qos *qos = bdev->internal.qos;
uint64_t limits[SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES];
if (!qos) {
return;
}
spdk_bdev_get_qos_rate_limits(bdev, limits);
spdk_json_write_object_begin(w);
spdk_json_write_named_string(w, "method", "bdev_set_qos_limit");
spdk_json_write_named_object_begin(w, "params");
spdk_json_write_named_string(w, "name", bdev->name);
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (limits[i] > 0) {
spdk_json_write_named_uint64(w, qos_rpc_type[i], limits[i]);
}
}
spdk_json_write_object_end(w);
spdk_json_write_object_end(w);
}
void
spdk_bdev_subsystem_config_json(struct spdk_json_write_ctx *w)
{
struct spdk_bdev_module *bdev_module;
struct spdk_bdev *bdev;
assert(w != NULL);
spdk_json_write_array_begin(w);
spdk_json_write_object_begin(w);
spdk_json_write_named_string(w, "method", "bdev_set_options");
spdk_json_write_named_object_begin(w, "params");
spdk_json_write_named_uint32(w, "bdev_io_pool_size", g_bdev_opts.bdev_io_pool_size);
spdk_json_write_named_uint32(w, "bdev_io_cache_size", g_bdev_opts.bdev_io_cache_size);
spdk_json_write_named_bool(w, "bdev_auto_examine", g_bdev_opts.bdev_auto_examine);
spdk_json_write_object_end(w);
spdk_json_write_object_end(w);
TAILQ_FOREACH(bdev_module, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (bdev_module->config_json) {
bdev_module->config_json(w);
}
}
pthread_mutex_lock(&g_bdev_mgr.mutex);
TAILQ_FOREACH(bdev, &g_bdev_mgr.bdevs, internal.link) {
if (bdev->fn_table->write_config_json) {
bdev->fn_table->write_config_json(bdev, w);
}
bdev_qos_config_json(bdev, w);
}
pthread_mutex_unlock(&g_bdev_mgr.mutex);
spdk_json_write_array_end(w);
}
static int
bdev_mgmt_channel_create(void *io_device, void *ctx_buf)
{
struct spdk_bdev_mgmt_channel *ch = ctx_buf;
struct spdk_bdev_io *bdev_io;
uint32_t i;
STAILQ_INIT(&ch->need_buf_small);
STAILQ_INIT(&ch->need_buf_large);
STAILQ_INIT(&ch->per_thread_cache);
ch->bdev_io_cache_size = g_bdev_opts.bdev_io_cache_size;
/* Pre-populate bdev_io cache to ensure this thread cannot be starved. */
ch->per_thread_cache_count = 0;
for (i = 0; i < ch->bdev_io_cache_size; i++) {
bdev_io = spdk_mempool_get(g_bdev_mgr.bdev_io_pool);
assert(bdev_io != NULL);
ch->per_thread_cache_count++;
STAILQ_INSERT_HEAD(&ch->per_thread_cache, bdev_io, internal.buf_link);
}
TAILQ_INIT(&ch->shared_resources);
TAILQ_INIT(&ch->io_wait_queue);
return 0;
}
static void
bdev_mgmt_channel_destroy(void *io_device, void *ctx_buf)
{
struct spdk_bdev_mgmt_channel *ch = ctx_buf;
struct spdk_bdev_io *bdev_io;
if (!STAILQ_EMPTY(&ch->need_buf_small) || !STAILQ_EMPTY(&ch->need_buf_large)) {
SPDK_ERRLOG("Pending I/O list wasn't empty on mgmt channel free\n");
}
if (!TAILQ_EMPTY(&ch->shared_resources)) {
SPDK_ERRLOG("Module channel list wasn't empty on mgmt channel free\n");
}
while (!STAILQ_EMPTY(&ch->per_thread_cache)) {
bdev_io = STAILQ_FIRST(&ch->per_thread_cache);
STAILQ_REMOVE_HEAD(&ch->per_thread_cache, internal.buf_link);
ch->per_thread_cache_count--;
spdk_mempool_put(g_bdev_mgr.bdev_io_pool, (void *)bdev_io);
}
assert(ch->per_thread_cache_count == 0);
}
static void
bdev_init_complete(int rc)
{
spdk_bdev_init_cb cb_fn = g_init_cb_fn;
void *cb_arg = g_init_cb_arg;
struct spdk_bdev_module *m;
g_bdev_mgr.init_complete = true;
g_init_cb_fn = NULL;
g_init_cb_arg = NULL;
/*
* For modules that need to know when subsystem init is complete,
* inform them now.
*/
if (rc == 0) {
TAILQ_FOREACH(m, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (m->init_complete) {
m->init_complete();
}
}
}
cb_fn(cb_arg, rc);
}
static void
bdev_module_action_complete(void)
{
struct spdk_bdev_module *m;
/*
* Don't finish bdev subsystem initialization if
* module pre-initialization is still in progress, or
* the subsystem been already initialized.
*/
if (!g_bdev_mgr.module_init_complete || g_bdev_mgr.init_complete) {
return;
}
/*
* Check all bdev modules for inits/examinations in progress. If any
* exist, return immediately since we cannot finish bdev subsystem
* initialization until all are completed.
*/
TAILQ_FOREACH(m, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (m->internal.action_in_progress > 0) {
return;
}
}
/*
* Modules already finished initialization - now that all
* the bdev modules have finished their asynchronous I/O
* processing, the entire bdev layer can be marked as complete.
*/
bdev_init_complete(0);
}
static void
bdev_module_action_done(struct spdk_bdev_module *module)
{
assert(module->internal.action_in_progress > 0);
module->internal.action_in_progress--;
bdev_module_action_complete();
}
void
spdk_bdev_module_init_done(struct spdk_bdev_module *module)
{
bdev_module_action_done(module);
}
void
spdk_bdev_module_examine_done(struct spdk_bdev_module *module)
{
bdev_module_action_done(module);
}
/** The last initialized bdev module */
static struct spdk_bdev_module *g_resume_bdev_module = NULL;
static void
bdev_init_failed(void *cb_arg)
{
struct spdk_bdev_module *module = cb_arg;
module->internal.action_in_progress--;
bdev_init_complete(-1);
}
static int
bdev_modules_init(void)
{
struct spdk_bdev_module *module;
int rc = 0;
TAILQ_FOREACH(module, &g_bdev_mgr.bdev_modules, internal.tailq) {
g_resume_bdev_module = module;
if (module->async_init) {
module->internal.action_in_progress = 1;
}
rc = module->module_init();
if (rc != 0) {
/* Bump action_in_progress to prevent other modules from completion of modules_init
* Send message to defer application shutdown until resources are cleaned up */
module->internal.action_in_progress = 1;
spdk_thread_send_msg(spdk_get_thread(), bdev_init_failed, module);
return rc;
}
}
g_resume_bdev_module = NULL;
return 0;
}
void
spdk_bdev_initialize(spdk_bdev_init_cb cb_fn, void *cb_arg)
{
struct spdk_conf_section *sp;
struct spdk_bdev_opts bdev_opts;
int32_t bdev_io_pool_size, bdev_io_cache_size;
int cache_size;
int rc = 0;
char mempool_name[32];
assert(cb_fn != NULL);
sp = spdk_conf_find_section(NULL, "Bdev");
if (sp != NULL) {
spdk_bdev_get_opts(&bdev_opts);
bdev_io_pool_size = spdk_conf_section_get_intval(sp, "BdevIoPoolSize");
if (bdev_io_pool_size >= 0) {
bdev_opts.bdev_io_pool_size = bdev_io_pool_size;
}
bdev_io_cache_size = spdk_conf_section_get_intval(sp, "BdevIoCacheSize");
if (bdev_io_cache_size >= 0) {
bdev_opts.bdev_io_cache_size = bdev_io_cache_size;
}
if (spdk_bdev_set_opts(&bdev_opts)) {
bdev_init_complete(-1);
return;
}
assert(memcmp(&bdev_opts, &g_bdev_opts, sizeof(bdev_opts)) == 0);
}
g_init_cb_fn = cb_fn;
g_init_cb_arg = cb_arg;
spdk_notify_type_register("bdev_register");
spdk_notify_type_register("bdev_unregister");
snprintf(mempool_name, sizeof(mempool_name), "bdev_io_%d", getpid());
g_bdev_mgr.bdev_io_pool = spdk_mempool_create(mempool_name,
g_bdev_opts.bdev_io_pool_size,
sizeof(struct spdk_bdev_io) +
bdev_module_get_max_ctx_size(),
0,
SPDK_ENV_SOCKET_ID_ANY);
if (g_bdev_mgr.bdev_io_pool == NULL) {
SPDK_ERRLOG("could not allocate spdk_bdev_io pool\n");
bdev_init_complete(-1);
return;
}
/**
* Ensure no more than half of the total buffers end up local caches, by
* using spdk_thread_get_count() to determine how many local caches we need
* to account for.
*/
cache_size = BUF_SMALL_POOL_SIZE / (2 * spdk_thread_get_count());
snprintf(mempool_name, sizeof(mempool_name), "buf_small_pool_%d", getpid());
g_bdev_mgr.buf_small_pool = spdk_mempool_create(mempool_name,
BUF_SMALL_POOL_SIZE,
SPDK_BDEV_BUF_SIZE_WITH_MD(SPDK_BDEV_SMALL_BUF_MAX_SIZE) +
SPDK_BDEV_POOL_ALIGNMENT,
cache_size,
SPDK_ENV_SOCKET_ID_ANY);
if (!g_bdev_mgr.buf_small_pool) {
SPDK_ERRLOG("create rbuf small pool failed\n");
bdev_init_complete(-1);
return;
}
cache_size = BUF_LARGE_POOL_SIZE / (2 * spdk_thread_get_count());
snprintf(mempool_name, sizeof(mempool_name), "buf_large_pool_%d", getpid());
g_bdev_mgr.buf_large_pool = spdk_mempool_create(mempool_name,
BUF_LARGE_POOL_SIZE,
SPDK_BDEV_BUF_SIZE_WITH_MD(SPDK_BDEV_LARGE_BUF_MAX_SIZE) +
SPDK_BDEV_POOL_ALIGNMENT,
cache_size,
SPDK_ENV_SOCKET_ID_ANY);
if (!g_bdev_mgr.buf_large_pool) {
SPDK_ERRLOG("create rbuf large pool failed\n");
bdev_init_complete(-1);
return;
}
g_bdev_mgr.zero_buffer = spdk_zmalloc(ZERO_BUFFER_SIZE, ZERO_BUFFER_SIZE,
NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
if (!g_bdev_mgr.zero_buffer) {
SPDK_ERRLOG("create bdev zero buffer failed\n");
bdev_init_complete(-1);
return;
}
#ifdef SPDK_CONFIG_VTUNE
g_bdev_mgr.domain = __itt_domain_create("spdk_bdev");
#endif
spdk_io_device_register(&g_bdev_mgr, bdev_mgmt_channel_create,
bdev_mgmt_channel_destroy,
sizeof(struct spdk_bdev_mgmt_channel),
"bdev_mgr");
rc = bdev_modules_init();
g_bdev_mgr.module_init_complete = true;
if (rc != 0) {
SPDK_ERRLOG("bdev modules init failed\n");
return;
}
bdev_module_action_complete();
}
static void
bdev_mgr_unregister_cb(void *io_device)
{
spdk_bdev_fini_cb cb_fn = g_fini_cb_fn;
if (g_bdev_mgr.bdev_io_pool) {
if (spdk_mempool_count(g_bdev_mgr.bdev_io_pool) != g_bdev_opts.bdev_io_pool_size) {
SPDK_ERRLOG("bdev IO pool count is %zu but should be %u\n",
spdk_mempool_count(g_bdev_mgr.bdev_io_pool),
g_bdev_opts.bdev_io_pool_size);
}
spdk_mempool_free(g_bdev_mgr.bdev_io_pool);
}
if (g_bdev_mgr.buf_small_pool) {
if (spdk_mempool_count(g_bdev_mgr.buf_small_pool) != BUF_SMALL_POOL_SIZE) {
SPDK_ERRLOG("Small buffer pool count is %zu but should be %u\n",
spdk_mempool_count(g_bdev_mgr.buf_small_pool),
BUF_SMALL_POOL_SIZE);
assert(false);
}
spdk_mempool_free(g_bdev_mgr.buf_small_pool);
}
if (g_bdev_mgr.buf_large_pool) {
if (spdk_mempool_count(g_bdev_mgr.buf_large_pool) != BUF_LARGE_POOL_SIZE) {
SPDK_ERRLOG("Large buffer pool count is %zu but should be %u\n",
spdk_mempool_count(g_bdev_mgr.buf_large_pool),
BUF_LARGE_POOL_SIZE);
assert(false);
}
spdk_mempool_free(g_bdev_mgr.buf_large_pool);
}
spdk_free(g_bdev_mgr.zero_buffer);
cb_fn(g_fini_cb_arg);
g_fini_cb_fn = NULL;
g_fini_cb_arg = NULL;
g_bdev_mgr.init_complete = false;
g_bdev_mgr.module_init_complete = false;
pthread_mutex_destroy(&g_bdev_mgr.mutex);
}
static void
bdev_module_finish_iter(void *arg)
{
struct spdk_bdev_module *bdev_module;
/* FIXME: Handling initialization failures is broken now,
* so we won't even try cleaning up after successfully
* initialized modules. if module_init_complete is false,
* just call spdk_bdev_mgr_unregister_cb
*/
if (!g_bdev_mgr.module_init_complete) {
bdev_mgr_unregister_cb(NULL);
return;
}
/* Start iterating from the last touched module */
if (!g_resume_bdev_module) {
bdev_module = TAILQ_LAST(&g_bdev_mgr.bdev_modules, bdev_module_list);
} else {
bdev_module = TAILQ_PREV(g_resume_bdev_module, bdev_module_list,
internal.tailq);
}
while (bdev_module) {
if (bdev_module->async_fini) {
/* Save our place so we can resume later. We must
* save the variable here, before calling module_fini()
* below, because in some cases the module may immediately
* call spdk_bdev_module_finish_done() and re-enter
* this function to continue iterating. */
g_resume_bdev_module = bdev_module;
}
if (bdev_module->module_fini) {
bdev_module->module_fini();
}
if (bdev_module->async_fini) {
return;
}
bdev_module = TAILQ_PREV(bdev_module, bdev_module_list,
internal.tailq);
}
g_resume_bdev_module = NULL;
spdk_io_device_unregister(&g_bdev_mgr, bdev_mgr_unregister_cb);
}
void
spdk_bdev_module_finish_done(void)
{
if (spdk_get_thread() != g_fini_thread) {
spdk_thread_send_msg(g_fini_thread, bdev_module_finish_iter, NULL);
} else {
bdev_module_finish_iter(NULL);
}
}
static void
bdev_finish_unregister_bdevs_iter(void *cb_arg, int bdeverrno)
{
struct spdk_bdev *bdev = cb_arg;
if (bdeverrno && bdev) {
SPDK_WARNLOG("Unable to unregister bdev '%s' during spdk_bdev_finish()\n",
bdev->name);
/*
* Since the call to spdk_bdev_unregister() failed, we have no way to free this
* bdev; try to continue by manually removing this bdev from the list and continue
* with the next bdev in the list.
*/
TAILQ_REMOVE(&g_bdev_mgr.bdevs, bdev, internal.link);
}
if (TAILQ_EMPTY(&g_bdev_mgr.bdevs)) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Done unregistering bdevs\n");
/*
* Bdev module finish need to be deferred as we might be in the middle of some context
* (like bdev part free) that will use this bdev (or private bdev driver ctx data)
* after returning.
*/
spdk_thread_send_msg(spdk_get_thread(), bdev_module_finish_iter, NULL);
return;
}
/*
* Unregister last unclaimed bdev in the list, to ensure that bdev subsystem
* shutdown proceeds top-down. The goal is to give virtual bdevs an opportunity
* to detect clean shutdown as opposed to run-time hot removal of the underlying
* base bdevs.
*
* Also, walk the list in the reverse order.
*/
for (bdev = TAILQ_LAST(&g_bdev_mgr.bdevs, spdk_bdev_list);
bdev; bdev = TAILQ_PREV(bdev, spdk_bdev_list, internal.link)) {
if (bdev->internal.claim_module != NULL) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Skipping claimed bdev '%s'(<-'%s').\n",
bdev->name, bdev->internal.claim_module->name);
continue;
}
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Unregistering bdev '%s'\n", bdev->name);
spdk_bdev_unregister(bdev, bdev_finish_unregister_bdevs_iter, bdev);
return;
}
/*
* If any bdev fails to unclaim underlying bdev properly, we may face the
* case of bdev list consisting of claimed bdevs only (if claims are managed
* correctly, this would mean there's a loop in the claims graph which is
* clearly impossible). Warn and unregister last bdev on the list then.
*/
for (bdev = TAILQ_LAST(&g_bdev_mgr.bdevs, spdk_bdev_list);
bdev; bdev = TAILQ_PREV(bdev, spdk_bdev_list, internal.link)) {
SPDK_WARNLOG("Unregistering claimed bdev '%s'!\n", bdev->name);
spdk_bdev_unregister(bdev, bdev_finish_unregister_bdevs_iter, bdev);
return;
}
}
void
spdk_bdev_finish(spdk_bdev_fini_cb cb_fn, void *cb_arg)
{
struct spdk_bdev_module *m;
assert(cb_fn != NULL);
g_fini_thread = spdk_get_thread();
g_fini_cb_fn = cb_fn;
g_fini_cb_arg = cb_arg;
TAILQ_FOREACH(m, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (m->fini_start) {
m->fini_start();
}
}
bdev_finish_unregister_bdevs_iter(NULL, 0);
}
struct spdk_bdev_io *
bdev_channel_get_io(struct spdk_bdev_channel *channel)
{
struct spdk_bdev_mgmt_channel *ch = channel->shared_resource->mgmt_ch;
struct spdk_bdev_io *bdev_io;
if (ch->per_thread_cache_count > 0) {
bdev_io = STAILQ_FIRST(&ch->per_thread_cache);
STAILQ_REMOVE_HEAD(&ch->per_thread_cache, internal.buf_link);
ch->per_thread_cache_count--;
} else if (spdk_unlikely(!TAILQ_EMPTY(&ch->io_wait_queue))) {
/*
* Don't try to look for bdev_ios in the global pool if there are
* waiters on bdev_ios - we don't want this caller to jump the line.
*/
bdev_io = NULL;
} else {
bdev_io = spdk_mempool_get(g_bdev_mgr.bdev_io_pool);
}
return bdev_io;
}
void
spdk_bdev_free_io(struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev_mgmt_channel *ch;
assert(bdev_io != NULL);
assert(bdev_io->internal.status != SPDK_BDEV_IO_STATUS_PENDING);
ch = bdev_io->internal.ch->shared_resource->mgmt_ch;
if (bdev_io->internal.buf != NULL) {
bdev_io_put_buf(bdev_io);
}
if (ch->per_thread_cache_count < ch->bdev_io_cache_size) {
ch->per_thread_cache_count++;
STAILQ_INSERT_HEAD(&ch->per_thread_cache, bdev_io, internal.buf_link);
while (ch->per_thread_cache_count > 0 && !TAILQ_EMPTY(&ch->io_wait_queue)) {
struct spdk_bdev_io_wait_entry *entry;
entry = TAILQ_FIRST(&ch->io_wait_queue);
TAILQ_REMOVE(&ch->io_wait_queue, entry, link);
entry->cb_fn(entry->cb_arg);
}
} else {
/* We should never have a full cache with entries on the io wait queue. */
assert(TAILQ_EMPTY(&ch->io_wait_queue));
spdk_mempool_put(g_bdev_mgr.bdev_io_pool, (void *)bdev_io);
}
}
static bool
bdev_qos_is_iops_rate_limit(enum spdk_bdev_qos_rate_limit_type limit)
{
assert(limit != SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES);
switch (limit) {
case SPDK_BDEV_QOS_RW_IOPS_RATE_LIMIT:
return true;
case SPDK_BDEV_QOS_RW_BPS_RATE_LIMIT:
case SPDK_BDEV_QOS_R_BPS_RATE_LIMIT:
case SPDK_BDEV_QOS_W_BPS_RATE_LIMIT:
return false;
case SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES:
default:
return false;
}
}
static bool
bdev_qos_io_to_limit(struct spdk_bdev_io *bdev_io)
{
switch (bdev_io->type) {
case SPDK_BDEV_IO_TYPE_NVME_IO:
case SPDK_BDEV_IO_TYPE_NVME_IO_MD:
case SPDK_BDEV_IO_TYPE_READ:
case SPDK_BDEV_IO_TYPE_WRITE:
return true;
case SPDK_BDEV_IO_TYPE_ZCOPY:
if (bdev_io->u.bdev.zcopy.start) {
return true;
} else {
return false;
}
default:
return false;
}
}
static bool
bdev_is_read_io(struct spdk_bdev_io *bdev_io)
{
switch (bdev_io->type) {
case SPDK_BDEV_IO_TYPE_NVME_IO:
case SPDK_BDEV_IO_TYPE_NVME_IO_MD:
/* Bit 1 (0x2) set for read operation */
if (bdev_io->u.nvme_passthru.cmd.opc & SPDK_NVME_OPC_READ) {
return true;
} else {
return false;
}
case SPDK_BDEV_IO_TYPE_READ:
return true;
case SPDK_BDEV_IO_TYPE_ZCOPY:
/* Populate to read from disk */
if (bdev_io->u.bdev.zcopy.populate) {
return true;
} else {
return false;
}
default:
return false;
}
}
static uint64_t
bdev_get_io_size_in_byte(struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev *bdev = bdev_io->bdev;
switch (bdev_io->type) {
case SPDK_BDEV_IO_TYPE_NVME_IO:
case SPDK_BDEV_IO_TYPE_NVME_IO_MD:
return bdev_io->u.nvme_passthru.nbytes;
case SPDK_BDEV_IO_TYPE_READ:
case SPDK_BDEV_IO_TYPE_WRITE:
return bdev_io->u.bdev.num_blocks * bdev->blocklen;
case SPDK_BDEV_IO_TYPE_ZCOPY:
/* Track the data in the start phase only */
if (bdev_io->u.bdev.zcopy.start) {
return bdev_io->u.bdev.num_blocks * bdev->blocklen;
} else {
return 0;
}
default:
return 0;
}
}
static bool
bdev_qos_rw_queue_io(const struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
if (limit->max_per_timeslice > 0 && limit->remaining_this_timeslice <= 0) {
return true;
} else {
return false;
}
}
static bool
bdev_qos_r_queue_io(const struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
if (bdev_is_read_io(io) == false) {
return false;
}
return bdev_qos_rw_queue_io(limit, io);
}
static bool
bdev_qos_w_queue_io(const struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
if (bdev_is_read_io(io) == true) {
return false;
}
return bdev_qos_rw_queue_io(limit, io);
}
static void
bdev_qos_rw_iops_update_quota(struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
limit->remaining_this_timeslice--;
}
static void
bdev_qos_rw_bps_update_quota(struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
limit->remaining_this_timeslice -= bdev_get_io_size_in_byte(io);
}
static void
bdev_qos_r_bps_update_quota(struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
if (bdev_is_read_io(io) == false) {
return;
}
return bdev_qos_rw_bps_update_quota(limit, io);
}
static void
bdev_qos_w_bps_update_quota(struct spdk_bdev_qos_limit *limit, struct spdk_bdev_io *io)
{
if (bdev_is_read_io(io) == true) {
return;
}
return bdev_qos_rw_bps_update_quota(limit, io);
}
static void
bdev_qos_set_ops(struct spdk_bdev_qos *qos)
{
int i;
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (qos->rate_limits[i].limit == SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
qos->rate_limits[i].queue_io = NULL;
qos->rate_limits[i].update_quota = NULL;
continue;
}
switch (i) {
case SPDK_BDEV_QOS_RW_IOPS_RATE_LIMIT:
qos->rate_limits[i].queue_io = bdev_qos_rw_queue_io;
qos->rate_limits[i].update_quota = bdev_qos_rw_iops_update_quota;
break;
case SPDK_BDEV_QOS_RW_BPS_RATE_LIMIT:
qos->rate_limits[i].queue_io = bdev_qos_rw_queue_io;
qos->rate_limits[i].update_quota = bdev_qos_rw_bps_update_quota;
break;
case SPDK_BDEV_QOS_R_BPS_RATE_LIMIT:
qos->rate_limits[i].queue_io = bdev_qos_r_queue_io;
qos->rate_limits[i].update_quota = bdev_qos_r_bps_update_quota;
break;
case SPDK_BDEV_QOS_W_BPS_RATE_LIMIT:
qos->rate_limits[i].queue_io = bdev_qos_w_queue_io;
qos->rate_limits[i].update_quota = bdev_qos_w_bps_update_quota;
break;
default:
break;
}
}
}
static inline void
bdev_io_do_submit(struct spdk_bdev_channel *bdev_ch, struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_io_channel *ch = bdev_ch->channel;
struct spdk_bdev_shared_resource *shared_resource = bdev_ch->shared_resource;
if (spdk_likely(TAILQ_EMPTY(&shared_resource->nomem_io))) {
bdev_ch->io_outstanding++;
shared_resource->io_outstanding++;
bdev_io->internal.in_submit_request = true;
bdev->fn_table->submit_request(ch, bdev_io);
bdev_io->internal.in_submit_request = false;
} else {
TAILQ_INSERT_TAIL(&shared_resource->nomem_io, bdev_io, internal.link);
}
}
static int
bdev_qos_io_submit(struct spdk_bdev_channel *ch, struct spdk_bdev_qos *qos)
{
struct spdk_bdev_io *bdev_io = NULL, *tmp = NULL;
int i, submitted_ios = 0;
TAILQ_FOREACH_SAFE(bdev_io, &qos->queued, internal.link, tmp) {
if (bdev_qos_io_to_limit(bdev_io) == true) {
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (!qos->rate_limits[i].queue_io) {
continue;
}
if (qos->rate_limits[i].queue_io(&qos->rate_limits[i],
bdev_io) == true) {
return submitted_ios;
}
}
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (!qos->rate_limits[i].update_quota) {
continue;
}
qos->rate_limits[i].update_quota(&qos->rate_limits[i], bdev_io);
}
}
TAILQ_REMOVE(&qos->queued, bdev_io, internal.link);
bdev_io_do_submit(ch, bdev_io);
submitted_ios++;
}
return submitted_ios;
}
static void
bdev_queue_io_wait_with_cb(struct spdk_bdev_io *bdev_io, spdk_bdev_io_wait_cb cb_fn)
{
int rc;
bdev_io->internal.waitq_entry.bdev = bdev_io->bdev;
bdev_io->internal.waitq_entry.cb_fn = cb_fn;
bdev_io->internal.waitq_entry.cb_arg = bdev_io;
rc = spdk_bdev_queue_io_wait(bdev_io->bdev, spdk_io_channel_from_ctx(bdev_io->internal.ch),
&bdev_io->internal.waitq_entry);
if (rc != 0) {
SPDK_ERRLOG("Queue IO failed, rc=%d\n", rc);
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
bdev_io->internal.cb(bdev_io, false, bdev_io->internal.caller_ctx);
}
}
static bool
bdev_io_type_can_split(uint8_t type)
{
assert(type != SPDK_BDEV_IO_TYPE_INVALID);
assert(type < SPDK_BDEV_NUM_IO_TYPES);
/* Only split READ and WRITE I/O. Theoretically other types of I/O like
* UNMAP could be split, but these types of I/O are typically much larger
* in size (sometimes the size of the entire block device), and the bdev
* module can more efficiently split these types of I/O. Plus those types
* of I/O do not have a payload, which makes the splitting process simpler.
*/
if (type == SPDK_BDEV_IO_TYPE_READ || type == SPDK_BDEV_IO_TYPE_WRITE) {
return true;
} else {
return false;
}
}
static bool
bdev_io_should_split(struct spdk_bdev_io *bdev_io)
{
uint64_t start_stripe, end_stripe;
uint32_t io_boundary = bdev_io->bdev->optimal_io_boundary;
if (io_boundary == 0) {
return false;
}
if (!bdev_io_type_can_split(bdev_io->type)) {
return false;
}
start_stripe = bdev_io->u.bdev.offset_blocks;
end_stripe = start_stripe + bdev_io->u.bdev.num_blocks - 1;
/* Avoid expensive div operations if possible. These spdk_u32 functions are very cheap. */
if (spdk_likely(spdk_u32_is_pow2(io_boundary))) {
start_stripe >>= spdk_u32log2(io_boundary);
end_stripe >>= spdk_u32log2(io_boundary);
} else {
start_stripe /= io_boundary;
end_stripe /= io_boundary;
}
return (start_stripe != end_stripe);
}
static uint32_t
_to_next_boundary(uint64_t offset, uint32_t boundary)
{
return (boundary - (offset % boundary));
}
static void
bdev_io_split_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg);
static void
_bdev_io_split(void *_bdev_io)
{
struct spdk_bdev_io *bdev_io = _bdev_io;
uint64_t current_offset, remaining;
uint32_t blocklen, to_next_boundary, to_next_boundary_bytes, to_last_block_bytes;
struct iovec *parent_iov, *iov;
uint64_t parent_iov_offset, iov_len;
uint32_t parent_iovpos, parent_iovcnt, child_iovcnt, iovcnt;
void *md_buf = NULL;
int rc;
remaining = bdev_io->u.bdev.split_remaining_num_blocks;
current_offset = bdev_io->u.bdev.split_current_offset_blocks;
blocklen = bdev_io->bdev->blocklen;
parent_iov_offset = (current_offset - bdev_io->u.bdev.offset_blocks) * blocklen;
parent_iovcnt = bdev_io->u.bdev.iovcnt;
for (parent_iovpos = 0; parent_iovpos < parent_iovcnt; parent_iovpos++) {
parent_iov = &bdev_io->u.bdev.iovs[parent_iovpos];
if (parent_iov_offset < parent_iov->iov_len) {
break;
}
parent_iov_offset -= parent_iov->iov_len;
}
child_iovcnt = 0;
while (remaining > 0 && parent_iovpos < parent_iovcnt && child_iovcnt < BDEV_IO_NUM_CHILD_IOV) {
to_next_boundary = _to_next_boundary(current_offset, bdev_io->bdev->optimal_io_boundary);
to_next_boundary = spdk_min(remaining, to_next_boundary);
to_next_boundary_bytes = to_next_boundary * blocklen;
iov = &bdev_io->child_iov[child_iovcnt];
iovcnt = 0;
if (bdev_io->u.bdev.md_buf) {
assert((parent_iov_offset % blocklen) > 0);
md_buf = (char *)bdev_io->u.bdev.md_buf + (parent_iov_offset / blocklen) *
spdk_bdev_get_md_size(bdev_io->bdev);
}
while (to_next_boundary_bytes > 0 && parent_iovpos < parent_iovcnt &&
child_iovcnt < BDEV_IO_NUM_CHILD_IOV) {
parent_iov = &bdev_io->u.bdev.iovs[parent_iovpos];
iov_len = spdk_min(to_next_boundary_bytes, parent_iov->iov_len - parent_iov_offset);
to_next_boundary_bytes -= iov_len;
bdev_io->child_iov[child_iovcnt].iov_base = parent_iov->iov_base + parent_iov_offset;
bdev_io->child_iov[child_iovcnt].iov_len = iov_len;
if (iov_len < parent_iov->iov_len - parent_iov_offset) {
parent_iov_offset += iov_len;
} else {
parent_iovpos++;
parent_iov_offset = 0;
}
child_iovcnt++;
iovcnt++;
}
if (to_next_boundary_bytes > 0) {
/* We had to stop this child I/O early because we ran out of
* child_iov space. Ensure the iovs to be aligned with block
* size and then adjust to_next_boundary before starting the
* child I/O.
*/
assert(child_iovcnt == BDEV_IO_NUM_CHILD_IOV);
to_last_block_bytes = to_next_boundary_bytes % blocklen;
if (to_last_block_bytes != 0) {
uint32_t child_iovpos = child_iovcnt - 1;
/* don't decrease child_iovcnt so the loop will naturally end */
to_last_block_bytes = blocklen - to_last_block_bytes;
to_next_boundary_bytes += to_last_block_bytes;
while (to_last_block_bytes > 0 && iovcnt > 0) {
iov_len = spdk_min(to_last_block_bytes,
bdev_io->child_iov[child_iovpos].iov_len);
bdev_io->child_iov[child_iovpos].iov_len -= iov_len;
if (bdev_io->child_iov[child_iovpos].iov_len == 0) {
child_iovpos--;
if (--iovcnt == 0) {
return;
}
}
to_last_block_bytes -= iov_len;
}
assert(to_last_block_bytes == 0);
}
to_next_boundary -= to_next_boundary_bytes / blocklen;
}
bdev_io->u.bdev.split_outstanding++;
if (bdev_io->type == SPDK_BDEV_IO_TYPE_READ) {
rc = bdev_readv_blocks_with_md(bdev_io->internal.desc,
spdk_io_channel_from_ctx(bdev_io->internal.ch),
iov, iovcnt, md_buf, current_offset,
to_next_boundary,
bdev_io_split_done, bdev_io);
} else {
rc = bdev_writev_blocks_with_md(bdev_io->internal.desc,
spdk_io_channel_from_ctx(bdev_io->internal.ch),
iov, iovcnt, md_buf, current_offset,
to_next_boundary,
bdev_io_split_done, bdev_io);
}
if (rc == 0) {
current_offset += to_next_boundary;
remaining -= to_next_boundary;
bdev_io->u.bdev.split_current_offset_blocks = current_offset;
bdev_io->u.bdev.split_remaining_num_blocks = remaining;
} else {
bdev_io->u.bdev.split_outstanding--;
if (rc == -ENOMEM) {
if (bdev_io->u.bdev.split_outstanding == 0) {
/* No I/O is outstanding. Hence we should wait here. */
bdev_queue_io_wait_with_cb(bdev_io, _bdev_io_split);
}
} else {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
if (bdev_io->u.bdev.split_outstanding == 0) {
spdk_trace_record_tsc(spdk_get_ticks(), TRACE_BDEV_IO_DONE, 0, 0,
(uintptr_t)bdev_io, 0);
TAILQ_REMOVE(&bdev_io->internal.ch->io_submitted, bdev_io, internal.ch_link);
bdev_io->internal.cb(bdev_io, false, bdev_io->internal.caller_ctx);
}
}
return;
}
}
}
static void
bdev_io_split_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
struct spdk_bdev_io *parent_io = cb_arg;
spdk_bdev_free_io(bdev_io);
if (!success) {
parent_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
}
parent_io->u.bdev.split_outstanding--;
if (parent_io->u.bdev.split_outstanding != 0) {
return;
}
/*
* Parent I/O finishes when all blocks are consumed.
*/
if (parent_io->u.bdev.split_remaining_num_blocks == 0) {
assert(parent_io->internal.cb != bdev_io_split_done);
spdk_trace_record_tsc(spdk_get_ticks(), TRACE_BDEV_IO_DONE, 0, 0,
(uintptr_t)parent_io, 0);
TAILQ_REMOVE(&parent_io->internal.ch->io_submitted, parent_io, internal.ch_link);
parent_io->internal.cb(parent_io, parent_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS,
parent_io->internal.caller_ctx);
return;
}
/*
* Continue with the splitting process. This function will complete the parent I/O if the
* splitting is done.
*/
_bdev_io_split(parent_io);
}
static void
bdev_io_split_get_buf_cb(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io, bool success);
static void
bdev_io_split(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io)
{
assert(bdev_io_type_can_split(bdev_io->type));
bdev_io->u.bdev.split_current_offset_blocks = bdev_io->u.bdev.offset_blocks;
bdev_io->u.bdev.split_remaining_num_blocks = bdev_io->u.bdev.num_blocks;
bdev_io->u.bdev.split_outstanding = 0;
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
if (_is_buf_allocated(bdev_io->u.bdev.iovs)) {
_bdev_io_split(bdev_io);
} else {
assert(bdev_io->type == SPDK_BDEV_IO_TYPE_READ);
spdk_bdev_io_get_buf(bdev_io, bdev_io_split_get_buf_cb,
bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen);
}
}
static void
bdev_io_split_get_buf_cb(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io, bool success)
{
if (!success) {
spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
return;
}
bdev_io_split(ch, bdev_io);
}
/* Explicitly mark this inline, since it's used as a function pointer and otherwise won't
* be inlined, at least on some compilers.
*/
static inline void
_bdev_io_submit(void *ctx)
{
struct spdk_bdev_io *bdev_io = ctx;
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_bdev_channel *bdev_ch = bdev_io->internal.ch;
struct spdk_bdev_shared_resource *shared_resource = bdev_ch->shared_resource;
uint64_t tsc;
tsc = spdk_get_ticks();
bdev_io->internal.submit_tsc = tsc;
spdk_trace_record_tsc(tsc, TRACE_BDEV_IO_START, 0, 0, (uintptr_t)bdev_io, bdev_io->type);
if (spdk_likely(bdev_ch->flags == 0)) {
bdev_io_do_submit(bdev_ch, bdev_io);
return;
}
bdev_ch->io_outstanding++;
shared_resource->io_outstanding++;
bdev_io->internal.in_submit_request = true;
if (bdev_ch->flags & BDEV_CH_RESET_IN_PROGRESS) {
spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
} else if (bdev_ch->flags & BDEV_CH_QOS_ENABLED) {
bdev_ch->io_outstanding--;
shared_resource->io_outstanding--;
TAILQ_INSERT_TAIL(&bdev->internal.qos->queued, bdev_io, internal.link);
bdev_qos_io_submit(bdev_ch, bdev->internal.qos);
} else {
SPDK_ERRLOG("unknown bdev_ch flag %x found\n", bdev_ch->flags);
spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
}
bdev_io->internal.in_submit_request = false;
}
bool
bdev_lba_range_overlapped(struct lba_range *range1, struct lba_range *range2);
bool
bdev_lba_range_overlapped(struct lba_range *range1, struct lba_range *range2)
{
if (range1->length == 0 || range2->length == 0) {
return false;
}
if (range1->offset + range1->length <= range2->offset) {
return false;
}
if (range2->offset + range2->length <= range1->offset) {
return false;
}
return true;
}
static bool
bdev_io_range_is_locked(struct spdk_bdev_io *bdev_io, struct lba_range *range)
{
struct spdk_bdev_channel *ch = bdev_io->internal.ch;
struct lba_range r;
switch (bdev_io->type) {
case SPDK_BDEV_IO_TYPE_NVME_IO:
case SPDK_BDEV_IO_TYPE_NVME_IO_MD:
/* Don't try to decode the NVMe command - just assume worst-case and that
* it overlaps a locked range.
*/
return true;
case SPDK_BDEV_IO_TYPE_WRITE:
case SPDK_BDEV_IO_TYPE_UNMAP:
case SPDK_BDEV_IO_TYPE_WRITE_ZEROES:
case SPDK_BDEV_IO_TYPE_ZCOPY:
r.offset = bdev_io->u.bdev.offset_blocks;
r.length = bdev_io->u.bdev.num_blocks;
if (!bdev_lba_range_overlapped(range, &r)) {
/* This I/O doesn't overlap the specified LBA range. */
return false;
} else if (range->owner_ch == ch && range->locked_ctx == bdev_io->internal.caller_ctx) {
/* This I/O overlaps, but the I/O is on the same channel that locked this
* range, and the caller_ctx is the same as the locked_ctx. This means
* that this I/O is associated with the lock, and is allowed to execute.
*/
return false;
} else {
return true;
}
default:
return false;
}
}
void
bdev_io_submit(struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_thread *thread = spdk_bdev_io_get_thread(bdev_io);
struct spdk_bdev_channel *ch = bdev_io->internal.ch;
assert(thread != NULL);
assert(bdev_io->internal.status == SPDK_BDEV_IO_STATUS_PENDING);
if (!TAILQ_EMPTY(&ch->locked_ranges)) {
struct lba_range *range;
TAILQ_FOREACH(range, &ch->locked_ranges, tailq) {
if (bdev_io_range_is_locked(bdev_io, range)) {
TAILQ_INSERT_TAIL(&ch->io_locked, bdev_io, internal.ch_link);
return;
}
}
}
/* Add the bdev_io to io_submitted only if it is the original
* submission from the bdev user. When a bdev_io is split,
* it comes back through this code path, so we need to make sure
* we don't try to add it a second time.
*/
if (bdev_io->internal.cb != bdev_io_split_done) {
TAILQ_INSERT_TAIL(&ch->io_submitted, bdev_io, internal.ch_link);
}
if (bdev->split_on_optimal_io_boundary && bdev_io_should_split(bdev_io)) {
bdev_io->internal.submit_tsc = spdk_get_ticks();
spdk_trace_record_tsc(bdev_io->internal.submit_tsc, TRACE_BDEV_IO_START, 0, 0,
(uintptr_t)bdev_io, bdev_io->type);
bdev_io_split(NULL, bdev_io);
return;
}
if (ch->flags & BDEV_CH_QOS_ENABLED) {
if ((thread == bdev->internal.qos->thread) || !bdev->internal.qos->thread) {
_bdev_io_submit(bdev_io);
} else {
bdev_io->internal.io_submit_ch = ch;
bdev_io->internal.ch = bdev->internal.qos->ch;
spdk_thread_send_msg(bdev->internal.qos->thread, _bdev_io_submit, bdev_io);
}
} else {
_bdev_io_submit(bdev_io);
}
}
static void
bdev_io_submit_reset(struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_bdev_channel *bdev_ch = bdev_io->internal.ch;
struct spdk_io_channel *ch = bdev_ch->channel;
assert(bdev_io->internal.status == SPDK_BDEV_IO_STATUS_PENDING);
bdev_io->internal.in_submit_request = true;
bdev->fn_table->submit_request(ch, bdev_io);
bdev_io->internal.in_submit_request = false;
}
void
bdev_io_init(struct spdk_bdev_io *bdev_io,
struct spdk_bdev *bdev, void *cb_arg,
spdk_bdev_io_completion_cb cb)
{
bdev_io->bdev = bdev;
bdev_io->internal.caller_ctx = cb_arg;
bdev_io->internal.cb = cb;
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_PENDING;
bdev_io->internal.in_submit_request = false;
bdev_io->internal.buf = NULL;
bdev_io->internal.io_submit_ch = NULL;
bdev_io->internal.orig_iovs = NULL;
bdev_io->internal.orig_iovcnt = 0;
bdev_io->internal.orig_md_buf = NULL;
bdev_io->internal.error.nvme.cdw0 = 0;
bdev_io->num_retries = 0;
bdev_io->internal.get_buf_cb = NULL;
bdev_io->internal.get_aux_buf_cb = NULL;
}
static bool
bdev_io_type_supported(struct spdk_bdev *bdev, enum spdk_bdev_io_type io_type)
{
return bdev->fn_table->io_type_supported(bdev->ctxt, io_type);
}
bool
spdk_bdev_io_type_supported(struct spdk_bdev *bdev, enum spdk_bdev_io_type io_type)
{
bool supported;
supported = bdev_io_type_supported(bdev, io_type);
if (!supported) {
switch (io_type) {
case SPDK_BDEV_IO_TYPE_WRITE_ZEROES:
/* The bdev layer will emulate write zeroes as long as write is supported. */
supported = bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE);
break;
case SPDK_BDEV_IO_TYPE_ZCOPY:
/* Zero copy can be emulated with regular read and write */
supported = bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_READ) &&
bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE);
break;
default:
break;
}
}
return supported;
}
int
spdk_bdev_dump_info_json(struct spdk_bdev *bdev, struct spdk_json_write_ctx *w)
{
if (bdev->fn_table->dump_info_json) {
return bdev->fn_table->dump_info_json(bdev->ctxt, w);
}
return 0;
}
static void
bdev_qos_update_max_quota_per_timeslice(struct spdk_bdev_qos *qos)
{
uint32_t max_per_timeslice = 0;
int i;
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (qos->rate_limits[i].limit == SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
qos->rate_limits[i].max_per_timeslice = 0;
continue;
}
max_per_timeslice = qos->rate_limits[i].limit *
SPDK_BDEV_QOS_TIMESLICE_IN_USEC / SPDK_SEC_TO_USEC;
qos->rate_limits[i].max_per_timeslice = spdk_max(max_per_timeslice,
qos->rate_limits[i].min_per_timeslice);
qos->rate_limits[i].remaining_this_timeslice = qos->rate_limits[i].max_per_timeslice;
}
bdev_qos_set_ops(qos);
}
static int
bdev_channel_poll_qos(void *arg)
{
struct spdk_bdev_qos *qos = arg;
uint64_t now = spdk_get_ticks();
int i;
if (now < (qos->last_timeslice + qos->timeslice_size)) {
/* We received our callback earlier than expected - return
* immediately and wait to do accounting until at least one
* timeslice has actually expired. This should never happen
* with a well-behaved timer implementation.
*/
return 0;
}
/* Reset for next round of rate limiting */
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
/* We may have allowed the IOs or bytes to slightly overrun in the last
* timeslice. remaining_this_timeslice is signed, so if it's negative
* here, we'll account for the overrun so that the next timeslice will
* be appropriately reduced.
*/
if (qos->rate_limits[i].remaining_this_timeslice > 0) {
qos->rate_limits[i].remaining_this_timeslice = 0;
}
}
while (now >= (qos->last_timeslice + qos->timeslice_size)) {
qos->last_timeslice += qos->timeslice_size;
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
qos->rate_limits[i].remaining_this_timeslice +=
qos->rate_limits[i].max_per_timeslice;
}
}
return bdev_qos_io_submit(qos->ch, qos);
}
static void
bdev_channel_destroy_resource(struct spdk_bdev_channel *ch)
{
struct spdk_bdev_shared_resource *shared_resource;
struct lba_range *range;
while (!TAILQ_EMPTY(&ch->locked_ranges)) {
range = TAILQ_FIRST(&ch->locked_ranges);
TAILQ_REMOVE(&ch->locked_ranges, range, tailq);
free(range);
}
spdk_put_io_channel(ch->channel);
shared_resource = ch->shared_resource;
assert(TAILQ_EMPTY(&ch->io_locked));
assert(TAILQ_EMPTY(&ch->io_submitted));
assert(ch->io_outstanding == 0);
assert(shared_resource->ref > 0);
shared_resource->ref--;
if (shared_resource->ref == 0) {
assert(shared_resource->io_outstanding == 0);
TAILQ_REMOVE(&shared_resource->mgmt_ch->shared_resources, shared_resource, link);
spdk_put_io_channel(spdk_io_channel_from_ctx(shared_resource->mgmt_ch));
free(shared_resource);
}
}
/* Caller must hold bdev->internal.mutex. */
static void
bdev_enable_qos(struct spdk_bdev *bdev, struct spdk_bdev_channel *ch)
{
struct spdk_bdev_qos *qos = bdev->internal.qos;
int i;
/* Rate limiting on this bdev enabled */
if (qos) {
if (qos->ch == NULL) {
struct spdk_io_channel *io_ch;
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Selecting channel %p as QoS channel for bdev %s on thread %p\n", ch,
bdev->name, spdk_get_thread());
/* No qos channel has been selected, so set one up */
/* Take another reference to ch */
io_ch = spdk_get_io_channel(__bdev_to_io_dev(bdev));
assert(io_ch != NULL);
qos->ch = ch;
qos->thread = spdk_io_channel_get_thread(io_ch);
TAILQ_INIT(&qos->queued);
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (bdev_qos_is_iops_rate_limit(i) == true) {
qos->rate_limits[i].min_per_timeslice =
SPDK_BDEV_QOS_MIN_IO_PER_TIMESLICE;
} else {
qos->rate_limits[i].min_per_timeslice =
SPDK_BDEV_QOS_MIN_BYTE_PER_TIMESLICE;
}
if (qos->rate_limits[i].limit == 0) {
qos->rate_limits[i].limit = SPDK_BDEV_QOS_LIMIT_NOT_DEFINED;
}
}
bdev_qos_update_max_quota_per_timeslice(qos);
qos->timeslice_size =
SPDK_BDEV_QOS_TIMESLICE_IN_USEC * spdk_get_ticks_hz() / SPDK_SEC_TO_USEC;
qos->last_timeslice = spdk_get_ticks();
qos->poller = SPDK_POLLER_REGISTER(bdev_channel_poll_qos,
qos,
SPDK_BDEV_QOS_TIMESLICE_IN_USEC);
}
ch->flags |= BDEV_CH_QOS_ENABLED;
}
}
struct poll_timeout_ctx {
struct spdk_bdev_desc *desc;
uint64_t timeout_in_sec;
spdk_bdev_io_timeout_cb cb_fn;
void *cb_arg;
};
static void
bdev_desc_free(struct spdk_bdev_desc *desc)
{
pthread_mutex_destroy(&desc->mutex);
free(desc->media_events_buffer);
free(desc);
}
static void
bdev_channel_poll_timeout_io_done(struct spdk_io_channel_iter *i, int status)
{
struct poll_timeout_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct spdk_bdev_desc *desc = ctx->desc;
free(ctx);
pthread_mutex_lock(&desc->mutex);
desc->refs--;
if (desc->closed == true && desc->refs == 0) {
pthread_mutex_unlock(&desc->mutex);
bdev_desc_free(desc);
return;
}
pthread_mutex_unlock(&desc->mutex);
}
static void
bdev_channel_poll_timeout_io(struct spdk_io_channel_iter *i)
{
struct poll_timeout_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct spdk_io_channel *io_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *bdev_ch = spdk_io_channel_get_ctx(io_ch);
struct spdk_bdev_desc *desc = ctx->desc;
struct spdk_bdev_io *bdev_io;
uint64_t now;
pthread_mutex_lock(&desc->mutex);
if (desc->closed == true) {
pthread_mutex_unlock(&desc->mutex);
spdk_for_each_channel_continue(i, -1);
return;
}
pthread_mutex_unlock(&desc->mutex);
now = spdk_get_ticks();
TAILQ_FOREACH(bdev_io, &bdev_ch->io_submitted, internal.ch_link) {
/* I/O are added to this TAILQ as they are submitted.
* So once we find an I/O that has not timed out, we can immediately exit the loop. */
if (now < (bdev_io->internal.submit_tsc +
ctx->timeout_in_sec * spdk_get_ticks_hz())) {
goto end;
}
if (bdev_io->internal.desc == desc) {
ctx->cb_fn(ctx->cb_arg, bdev_io);
}
}
end:
spdk_for_each_channel_continue(i, 0);
}
static int
bdev_poll_timeout_io(void *arg)
{
struct spdk_bdev_desc *desc = arg;
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct poll_timeout_ctx *ctx;
ctx = calloc(1, sizeof(struct poll_timeout_ctx));
if (!ctx) {
SPDK_ERRLOG("failed to allocate memory\n");
return 1;
}
ctx->desc = desc;
ctx->cb_arg = desc->cb_arg;
ctx->cb_fn = desc->cb_fn;
ctx->timeout_in_sec = desc->timeout_in_sec;
/* Take a ref on the descriptor in case it gets closed while we are checking
* all of the channels.
*/
pthread_mutex_lock(&desc->mutex);
desc->refs++;
pthread_mutex_unlock(&desc->mutex);
spdk_for_each_channel(__bdev_to_io_dev(bdev),
bdev_channel_poll_timeout_io,
ctx,
bdev_channel_poll_timeout_io_done);
return 1;
}
int
spdk_bdev_set_timeout(struct spdk_bdev_desc *desc, uint64_t timeout_in_sec,
spdk_bdev_io_timeout_cb cb_fn, void *cb_arg)
{
assert(desc->thread == spdk_get_thread());
spdk_poller_unregister(&desc->io_timeout_poller);
if (timeout_in_sec) {
assert(cb_fn != NULL);
desc->io_timeout_poller = SPDK_POLLER_REGISTER(bdev_poll_timeout_io,
desc,
SPDK_BDEV_IO_POLL_INTERVAL_IN_MSEC * SPDK_SEC_TO_USEC /
1000);
if (desc->io_timeout_poller == NULL) {
SPDK_ERRLOG("can not register the desc timeout IO poller\n");
return -1;
}
}
desc->cb_fn = cb_fn;
desc->cb_arg = cb_arg;
desc->timeout_in_sec = timeout_in_sec;
return 0;
}
static int
bdev_channel_create(void *io_device, void *ctx_buf)
{
struct spdk_bdev *bdev = __bdev_from_io_dev(io_device);
struct spdk_bdev_channel *ch = ctx_buf;
struct spdk_io_channel *mgmt_io_ch;
struct spdk_bdev_mgmt_channel *mgmt_ch;
struct spdk_bdev_shared_resource *shared_resource;
struct lba_range *range;
ch->bdev = bdev;
ch->channel = bdev->fn_table->get_io_channel(bdev->ctxt);
if (!ch->channel) {
return -1;
}
assert(ch->histogram == NULL);
if (bdev->internal.histogram_enabled) {
ch->histogram = spdk_histogram_data_alloc();
if (ch->histogram == NULL) {
SPDK_ERRLOG("Could not allocate histogram\n");
}
}
mgmt_io_ch = spdk_get_io_channel(&g_bdev_mgr);
if (!mgmt_io_ch) {
spdk_put_io_channel(ch->channel);
return -1;
}
mgmt_ch = spdk_io_channel_get_ctx(mgmt_io_ch);
TAILQ_FOREACH(shared_resource, &mgmt_ch->shared_resources, link) {
if (shared_resource->shared_ch == ch->channel) {
spdk_put_io_channel(mgmt_io_ch);
shared_resource->ref++;
break;
}
}
if (shared_resource == NULL) {
shared_resource = calloc(1, sizeof(*shared_resource));
if (shared_resource == NULL) {
spdk_put_io_channel(ch->channel);
spdk_put_io_channel(mgmt_io_ch);
return -1;
}
shared_resource->mgmt_ch = mgmt_ch;
shared_resource->io_outstanding = 0;
TAILQ_INIT(&shared_resource->nomem_io);
shared_resource->nomem_threshold = 0;
shared_resource->shared_ch = ch->channel;
shared_resource->ref = 1;
TAILQ_INSERT_TAIL(&mgmt_ch->shared_resources, shared_resource, link);
}
memset(&ch->stat, 0, sizeof(ch->stat));
ch->stat.ticks_rate = spdk_get_ticks_hz();
ch->io_outstanding = 0;
TAILQ_INIT(&ch->queued_resets);
TAILQ_INIT(&ch->locked_ranges);
ch->flags = 0;
ch->shared_resource = shared_resource;
TAILQ_INIT(&ch->io_submitted);
TAILQ_INIT(&ch->io_locked);
#ifdef SPDK_CONFIG_VTUNE
{
char *name;
__itt_init_ittlib(NULL, 0);
name = spdk_sprintf_alloc("spdk_bdev_%s_%p", ch->bdev->name, ch);
if (!name) {
bdev_channel_destroy_resource(ch);
return -1;
}
ch->handle = __itt_string_handle_create(name);
free(name);
ch->start_tsc = spdk_get_ticks();
ch->interval_tsc = spdk_get_ticks_hz() / 100;
memset(&ch->prev_stat, 0, sizeof(ch->prev_stat));
}
#endif
pthread_mutex_lock(&bdev->internal.mutex);
bdev_enable_qos(bdev, ch);
TAILQ_FOREACH(range, &bdev->internal.locked_ranges, tailq) {
struct lba_range *new_range;
new_range = calloc(1, sizeof(*new_range));
if (new_range == NULL) {
pthread_mutex_unlock(&bdev->internal.mutex);
bdev_channel_destroy_resource(ch);
return -1;
}
new_range->length = range->length;
new_range->offset = range->offset;
new_range->locked_ctx = range->locked_ctx;
TAILQ_INSERT_TAIL(&ch->locked_ranges, new_range, tailq);
}
pthread_mutex_unlock(&bdev->internal.mutex);
return 0;
}
/*
* Abort I/O that are waiting on a data buffer. These types of I/O are
* linked using the spdk_bdev_io internal.buf_link TAILQ_ENTRY.
*/
static void
bdev_abort_buf_io(bdev_io_stailq_t *queue, struct spdk_bdev_channel *ch)
{
bdev_io_stailq_t tmp;
struct spdk_bdev_io *bdev_io;
STAILQ_INIT(&tmp);
while (!STAILQ_EMPTY(queue)) {
bdev_io = STAILQ_FIRST(queue);
STAILQ_REMOVE_HEAD(queue, internal.buf_link);
if (bdev_io->internal.ch == ch) {
spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
} else {
STAILQ_INSERT_TAIL(&tmp, bdev_io, internal.buf_link);
}
}
STAILQ_SWAP(&tmp, queue, spdk_bdev_io);
}
/*
* Abort I/O that are queued waiting for submission. These types of I/O are
* linked using the spdk_bdev_io link TAILQ_ENTRY.
*/
static void
bdev_abort_queued_io(bdev_io_tailq_t *queue, struct spdk_bdev_channel *ch)
{
struct spdk_bdev_io *bdev_io, *tmp;
TAILQ_FOREACH_SAFE(bdev_io, queue, internal.link, tmp) {
if (bdev_io->internal.ch == ch) {
TAILQ_REMOVE(queue, bdev_io, internal.link);
/*
* spdk_bdev_io_complete() assumes that the completed I/O had
* been submitted to the bdev module. Since in this case it
* hadn't, bump io_outstanding to account for the decrement
* that spdk_bdev_io_complete() will do.
*/
if (bdev_io->type != SPDK_BDEV_IO_TYPE_RESET) {
ch->io_outstanding++;
ch->shared_resource->io_outstanding++;
}
spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
}
}
}
static void
bdev_qos_channel_destroy(void *cb_arg)
{
struct spdk_bdev_qos *qos = cb_arg;
spdk_put_io_channel(spdk_io_channel_from_ctx(qos->ch));
spdk_poller_unregister(&qos->poller);
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Free QoS %p.\n", qos);
free(qos);
}
static int
bdev_qos_destroy(struct spdk_bdev *bdev)
{
int i;
/*
* Cleanly shutting down the QoS poller is tricky, because
* during the asynchronous operation the user could open
* a new descriptor and create a new channel, spawning
* a new QoS poller.
*
* The strategy is to create a new QoS structure here and swap it
* in. The shutdown path then continues to refer to the old one
* until it completes and then releases it.
*/
struct spdk_bdev_qos *new_qos, *old_qos;
old_qos = bdev->internal.qos;
new_qos = calloc(1, sizeof(*new_qos));
if (!new_qos) {
SPDK_ERRLOG("Unable to allocate memory to shut down QoS.\n");
return -ENOMEM;
}
/* Copy the old QoS data into the newly allocated structure */
memcpy(new_qos, old_qos, sizeof(*new_qos));
/* Zero out the key parts of the QoS structure */
new_qos->ch = NULL;
new_qos->thread = NULL;
new_qos->poller = NULL;
TAILQ_INIT(&new_qos->queued);
/*
* The limit member of spdk_bdev_qos_limit structure is not zeroed.
* It will be used later for the new QoS structure.
*/
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
new_qos->rate_limits[i].remaining_this_timeslice = 0;
new_qos->rate_limits[i].min_per_timeslice = 0;
new_qos->rate_limits[i].max_per_timeslice = 0;
}
bdev->internal.qos = new_qos;
if (old_qos->thread == NULL) {
free(old_qos);
} else {
spdk_thread_send_msg(old_qos->thread, bdev_qos_channel_destroy, old_qos);
}
/* It is safe to continue with destroying the bdev even though the QoS channel hasn't
* been destroyed yet. The destruction path will end up waiting for the final
* channel to be put before it releases resources. */
return 0;
}
static void
bdev_io_stat_add(struct spdk_bdev_io_stat *total, struct spdk_bdev_io_stat *add)
{
total->bytes_read += add->bytes_read;
total->num_read_ops += add->num_read_ops;
total->bytes_written += add->bytes_written;
total->num_write_ops += add->num_write_ops;
total->bytes_unmapped += add->bytes_unmapped;
total->num_unmap_ops += add->num_unmap_ops;
total->read_latency_ticks += add->read_latency_ticks;
total->write_latency_ticks += add->write_latency_ticks;
total->unmap_latency_ticks += add->unmap_latency_ticks;
}
static void
bdev_channel_destroy(void *io_device, void *ctx_buf)
{
struct spdk_bdev_channel *ch = ctx_buf;
struct spdk_bdev_mgmt_channel *mgmt_ch;
struct spdk_bdev_shared_resource *shared_resource = ch->shared_resource;
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Destroying channel %p for bdev %s on thread %p\n", ch, ch->bdev->name,
spdk_get_thread());
/* This channel is going away, so add its statistics into the bdev so that they don't get lost. */
pthread_mutex_lock(&ch->bdev->internal.mutex);
bdev_io_stat_add(&ch->bdev->internal.stat, &ch->stat);
pthread_mutex_unlock(&ch->bdev->internal.mutex);
mgmt_ch = shared_resource->mgmt_ch;
bdev_abort_queued_io(&ch->queued_resets, ch);
bdev_abort_queued_io(&shared_resource->nomem_io, ch);
bdev_abort_buf_io(&mgmt_ch->need_buf_small, ch);
bdev_abort_buf_io(&mgmt_ch->need_buf_large, ch);
if (ch->histogram) {
spdk_histogram_data_free(ch->histogram);
}
bdev_channel_destroy_resource(ch);
}
int
spdk_bdev_alias_add(struct spdk_bdev *bdev, const char *alias)
{
struct spdk_bdev_alias *tmp;
if (alias == NULL) {
SPDK_ERRLOG("Empty alias passed\n");
return -EINVAL;
}
if (spdk_bdev_get_by_name(alias)) {
SPDK_ERRLOG("Bdev name/alias: %s already exists\n", alias);
return -EEXIST;
}
tmp = calloc(1, sizeof(*tmp));
if (tmp == NULL) {
SPDK_ERRLOG("Unable to allocate alias\n");
return -ENOMEM;
}
tmp->alias = strdup(alias);
if (tmp->alias == NULL) {
free(tmp);
SPDK_ERRLOG("Unable to allocate alias\n");
return -ENOMEM;
}
TAILQ_INSERT_TAIL(&bdev->aliases, tmp, tailq);
return 0;
}
int
spdk_bdev_alias_del(struct spdk_bdev *bdev, const char *alias)
{
struct spdk_bdev_alias *tmp;
TAILQ_FOREACH(tmp, &bdev->aliases, tailq) {
if (strcmp(alias, tmp->alias) == 0) {
TAILQ_REMOVE(&bdev->aliases, tmp, tailq);
free(tmp->alias);
free(tmp);
return 0;
}
}
SPDK_INFOLOG(SPDK_LOG_BDEV, "Alias %s does not exists\n", alias);
return -ENOENT;
}
void
spdk_bdev_alias_del_all(struct spdk_bdev *bdev)
{
struct spdk_bdev_alias *p, *tmp;
TAILQ_FOREACH_SAFE(p, &bdev->aliases, tailq, tmp) {
TAILQ_REMOVE(&bdev->aliases, p, tailq);
free(p->alias);
free(p);
}
}
struct spdk_io_channel *
spdk_bdev_get_io_channel(struct spdk_bdev_desc *desc)
{
return spdk_get_io_channel(__bdev_to_io_dev(spdk_bdev_desc_get_bdev(desc)));
}
const char *
spdk_bdev_get_name(const struct spdk_bdev *bdev)
{
return bdev->name;
}
const char *
spdk_bdev_get_product_name(const struct spdk_bdev *bdev)
{
return bdev->product_name;
}
const struct spdk_bdev_aliases_list *
spdk_bdev_get_aliases(const struct spdk_bdev *bdev)
{
return &bdev->aliases;
}
uint32_t
spdk_bdev_get_block_size(const struct spdk_bdev *bdev)
{
return bdev->blocklen;
}
uint32_t
spdk_bdev_get_write_unit_size(const struct spdk_bdev *bdev)
{
return bdev->write_unit_size;
}
uint64_t
spdk_bdev_get_num_blocks(const struct spdk_bdev *bdev)
{
return bdev->blockcnt;
}
const char *
spdk_bdev_get_qos_rpc_type(enum spdk_bdev_qos_rate_limit_type type)
{
return qos_rpc_type[type];
}
void
spdk_bdev_get_qos_rate_limits(struct spdk_bdev *bdev, uint64_t *limits)
{
int i;
memset(limits, 0, sizeof(*limits) * SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES);
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev->internal.qos) {
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (bdev->internal.qos->rate_limits[i].limit !=
SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
limits[i] = bdev->internal.qos->rate_limits[i].limit;
if (bdev_qos_is_iops_rate_limit(i) == false) {
/* Change from Byte to Megabyte which is user visible. */
limits[i] = limits[i] / 1024 / 1024;
}
}
}
}
pthread_mutex_unlock(&bdev->internal.mutex);
}
size_t
spdk_bdev_get_buf_align(const struct spdk_bdev *bdev)
{
return 1 << bdev->required_alignment;
}
uint32_t
spdk_bdev_get_optimal_io_boundary(const struct spdk_bdev *bdev)
{
return bdev->optimal_io_boundary;
}
bool
spdk_bdev_has_write_cache(const struct spdk_bdev *bdev)
{
return bdev->write_cache;
}
const struct spdk_uuid *
spdk_bdev_get_uuid(const struct spdk_bdev *bdev)
{
return &bdev->uuid;
}
uint16_t
spdk_bdev_get_acwu(const struct spdk_bdev *bdev)
{
return bdev->acwu;
}
uint32_t
spdk_bdev_get_md_size(const struct spdk_bdev *bdev)
{
return bdev->md_len;
}
bool
spdk_bdev_is_md_interleaved(const struct spdk_bdev *bdev)
{
return (bdev->md_len != 0) && bdev->md_interleave;
}
bool
spdk_bdev_is_md_separate(const struct spdk_bdev *bdev)
{
return (bdev->md_len != 0) && !bdev->md_interleave;
}
bool
spdk_bdev_is_zoned(const struct spdk_bdev *bdev)
{
return bdev->zoned;
}
uint32_t
spdk_bdev_get_data_block_size(const struct spdk_bdev *bdev)
{
if (spdk_bdev_is_md_interleaved(bdev)) {
return bdev->blocklen - bdev->md_len;
} else {
return bdev->blocklen;
}
}
static uint32_t
_bdev_get_block_size_with_md(const struct spdk_bdev *bdev)
{
if (!spdk_bdev_is_md_interleaved(bdev)) {
return bdev->blocklen + bdev->md_len;
} else {
return bdev->blocklen;
}
}
enum spdk_dif_type spdk_bdev_get_dif_type(const struct spdk_bdev *bdev)
{
if (bdev->md_len != 0) {
return bdev->dif_type;
} else {
return SPDK_DIF_DISABLE;
}
}
bool
spdk_bdev_is_dif_head_of_md(const struct spdk_bdev *bdev)
{
if (spdk_bdev_get_dif_type(bdev) != SPDK_DIF_DISABLE) {
return bdev->dif_is_head_of_md;
} else {
return false;
}
}
bool
spdk_bdev_is_dif_check_enabled(const struct spdk_bdev *bdev,
enum spdk_dif_check_type check_type)
{
if (spdk_bdev_get_dif_type(bdev) == SPDK_DIF_DISABLE) {
return false;
}
switch (check_type) {
case SPDK_DIF_CHECK_TYPE_REFTAG:
return (bdev->dif_check_flags & SPDK_DIF_FLAGS_REFTAG_CHECK) != 0;
case SPDK_DIF_CHECK_TYPE_APPTAG:
return (bdev->dif_check_flags & SPDK_DIF_FLAGS_APPTAG_CHECK) != 0;
case SPDK_DIF_CHECK_TYPE_GUARD:
return (bdev->dif_check_flags & SPDK_DIF_FLAGS_GUARD_CHECK) != 0;
default:
return false;
}
}
uint64_t
spdk_bdev_get_qd(const struct spdk_bdev *bdev)
{
return bdev->internal.measured_queue_depth;
}
uint64_t
spdk_bdev_get_qd_sampling_period(const struct spdk_bdev *bdev)
{
return bdev->internal.period;
}
uint64_t
spdk_bdev_get_weighted_io_time(const struct spdk_bdev *bdev)
{
return bdev->internal.weighted_io_time;
}
uint64_t
spdk_bdev_get_io_time(const struct spdk_bdev *bdev)
{
return bdev->internal.io_time;
}
static void
_calculate_measured_qd_cpl(struct spdk_io_channel_iter *i, int status)
{
struct spdk_bdev *bdev = spdk_io_channel_iter_get_ctx(i);
bdev->internal.measured_queue_depth = bdev->internal.temporary_queue_depth;
if (bdev->internal.measured_queue_depth) {
bdev->internal.io_time += bdev->internal.period;
bdev->internal.weighted_io_time += bdev->internal.period * bdev->internal.measured_queue_depth;
}
}
static void
_calculate_measured_qd(struct spdk_io_channel_iter *i)
{
struct spdk_bdev *bdev = spdk_io_channel_iter_get_ctx(i);
struct spdk_io_channel *io_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(io_ch);
bdev->internal.temporary_queue_depth += ch->io_outstanding;
spdk_for_each_channel_continue(i, 0);
}
static int
bdev_calculate_measured_queue_depth(void *ctx)
{
struct spdk_bdev *bdev = ctx;
bdev->internal.temporary_queue_depth = 0;
spdk_for_each_channel(__bdev_to_io_dev(bdev), _calculate_measured_qd, bdev,
_calculate_measured_qd_cpl);
return 0;
}
void
spdk_bdev_set_qd_sampling_period(struct spdk_bdev *bdev, uint64_t period)
{
bdev->internal.period = period;
if (bdev->internal.qd_poller != NULL) {
spdk_poller_unregister(&bdev->internal.qd_poller);
bdev->internal.measured_queue_depth = UINT64_MAX;
}
if (period != 0) {
bdev->internal.qd_poller = SPDK_POLLER_REGISTER(bdev_calculate_measured_queue_depth, bdev,
period);
}
}
static void
_resize_notify(void *arg)
{
struct spdk_bdev_desc *desc = arg;
pthread_mutex_lock(&desc->mutex);
desc->refs--;
if (!desc->closed) {
pthread_mutex_unlock(&desc->mutex);
desc->callback.event_fn(SPDK_BDEV_EVENT_RESIZE,
desc->bdev,
desc->callback.ctx);
return;
} else if (0 == desc->refs) {
/* This descriptor was closed after this resize_notify message was sent.
* spdk_bdev_close() could not free the descriptor since this message was
* in flight, so we free it now using bdev_desc_free().
*/
pthread_mutex_unlock(&desc->mutex);
bdev_desc_free(desc);
return;
}
pthread_mutex_unlock(&desc->mutex);
}
int
spdk_bdev_notify_blockcnt_change(struct spdk_bdev *bdev, uint64_t size)
{
struct spdk_bdev_desc *desc;
int ret;
pthread_mutex_lock(&bdev->internal.mutex);
/* bdev has open descriptors */
if (!TAILQ_EMPTY(&bdev->internal.open_descs) &&
bdev->blockcnt > size) {
ret = -EBUSY;
} else {
bdev->blockcnt = size;
TAILQ_FOREACH(desc, &bdev->internal.open_descs, link) {
pthread_mutex_lock(&desc->mutex);
if (desc->callback.open_with_ext && !desc->closed) {
desc->refs++;
spdk_thread_send_msg(desc->thread, _resize_notify, desc);
}
pthread_mutex_unlock(&desc->mutex);
}
ret = 0;
}
pthread_mutex_unlock(&bdev->internal.mutex);
return ret;
}
/*
* Convert I/O offset and length from bytes to blocks.
*
* Returns zero on success or non-zero if the byte parameters aren't divisible by the block size.
*/
static uint64_t
bdev_bytes_to_blocks(struct spdk_bdev *bdev, uint64_t offset_bytes, uint64_t *offset_blocks,
uint64_t num_bytes, uint64_t *num_blocks)
{
uint32_t block_size = bdev->blocklen;
uint8_t shift_cnt;
/* Avoid expensive div operations if possible. These spdk_u32 functions are very cheap. */
if (spdk_likely(spdk_u32_is_pow2(block_size))) {
shift_cnt = spdk_u32log2(block_size);
*offset_blocks = offset_bytes >> shift_cnt;
*num_blocks = num_bytes >> shift_cnt;
return (offset_bytes - (*offset_blocks << shift_cnt)) |
(num_bytes - (*num_blocks << shift_cnt));
} else {
*offset_blocks = offset_bytes / block_size;
*num_blocks = num_bytes / block_size;
return (offset_bytes % block_size) | (num_bytes % block_size);
}
}
static bool
bdev_io_valid_blocks(struct spdk_bdev *bdev, uint64_t offset_blocks, uint64_t num_blocks)
{
/* Return failure if offset_blocks + num_blocks is less than offset_blocks; indicates there
* has been an overflow and hence the offset has been wrapped around */
if (offset_blocks + num_blocks < offset_blocks) {
return false;
}
/* Return failure if offset_blocks + num_blocks exceeds the size of the bdev */
if (offset_blocks + num_blocks > bdev->blockcnt) {
return false;
}
return true;
}
static bool
_bdev_io_check_md_buf(const struct iovec *iovs, const void *md_buf)
{
return _is_buf_allocated(iovs) == (md_buf != NULL);
}
static int
bdev_read_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch, void *buf,
void *md_buf, int64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_READ;
bdev_io->u.bdev.iovs = &bdev_io->iov;
bdev_io->u.bdev.iovs[0].iov_base = buf;
bdev_io->u.bdev.iovs[0].iov_len = num_blocks * bdev->blocklen;
bdev_io->u.bdev.iovcnt = 1;
bdev_io->u.bdev.md_buf = md_buf;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_read(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, uint64_t offset, uint64_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
nbytes, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_read_blocks(desc, ch, buf, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_read_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
return bdev_read_blocks_with_md(desc, ch, buf, NULL, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_read_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, void *md_buf, int64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct iovec iov = {
.iov_base = buf,
};
if (!spdk_bdev_is_md_separate(spdk_bdev_desc_get_bdev(desc))) {
return -EINVAL;
}
if (!_bdev_io_check_md_buf(&iov, md_buf)) {
return -EINVAL;
}
return bdev_read_blocks_with_md(desc, ch, buf, md_buf, offset_blocks, num_blocks,
cb, cb_arg);
}
int
spdk_bdev_readv(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt,
uint64_t offset, uint64_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
nbytes, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_readv_blocks(desc, ch, iov, iovcnt, offset_blocks, num_blocks, cb, cb_arg);
}
static int
bdev_readv_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf, uint64_t offset_blocks,
uint64_t num_blocks, spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_READ;
bdev_io->u.bdev.iovs = iov;
bdev_io->u.bdev.iovcnt = iovcnt;
bdev_io->u.bdev.md_buf = md_buf;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int spdk_bdev_readv_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
return bdev_readv_blocks_with_md(desc, ch, iov, iovcnt, NULL, offset_blocks,
num_blocks, cb, cb_arg);
}
int
spdk_bdev_readv_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
if (!spdk_bdev_is_md_separate(spdk_bdev_desc_get_bdev(desc))) {
return -EINVAL;
}
if (!_bdev_io_check_md_buf(iov, md_buf)) {
return -EINVAL;
}
return bdev_readv_blocks_with_md(desc, ch, iov, iovcnt, md_buf, offset_blocks,
num_blocks, cb, cb_arg);
}
static int
bdev_write_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, void *md_buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_WRITE;
bdev_io->u.bdev.iovs = &bdev_io->iov;
bdev_io->u.bdev.iovs[0].iov_base = buf;
bdev_io->u.bdev.iovs[0].iov_len = num_blocks * bdev->blocklen;
bdev_io->u.bdev.iovcnt = 1;
bdev_io->u.bdev.md_buf = md_buf;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_write(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, uint64_t offset, uint64_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
nbytes, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_write_blocks(desc, ch, buf, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_write_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
return bdev_write_blocks_with_md(desc, ch, buf, NULL, offset_blocks, num_blocks,
cb, cb_arg);
}
int
spdk_bdev_write_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, void *md_buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct iovec iov = {
.iov_base = buf,
};
if (!spdk_bdev_is_md_separate(spdk_bdev_desc_get_bdev(desc))) {
return -EINVAL;
}
if (!_bdev_io_check_md_buf(&iov, md_buf)) {
return -EINVAL;
}
return bdev_write_blocks_with_md(desc, ch, buf, md_buf, offset_blocks, num_blocks,
cb, cb_arg);
}
static int
bdev_writev_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_WRITE;
bdev_io->u.bdev.iovs = iov;
bdev_io->u.bdev.iovcnt = iovcnt;
bdev_io->u.bdev.md_buf = md_buf;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_writev(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt,
uint64_t offset, uint64_t len,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
len, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_writev_blocks(desc, ch, iov, iovcnt, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_writev_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
return bdev_writev_blocks_with_md(desc, ch, iov, iovcnt, NULL, offset_blocks,
num_blocks, cb, cb_arg);
}
int
spdk_bdev_writev_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
if (!spdk_bdev_is_md_separate(spdk_bdev_desc_get_bdev(desc))) {
return -EINVAL;
}
if (!_bdev_io_check_md_buf(iov, md_buf)) {
return -EINVAL;
}
return bdev_writev_blocks_with_md(desc, ch, iov, iovcnt, md_buf, offset_blocks,
num_blocks, cb, cb_arg);
}
static void
bdev_compare_do_read_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
struct spdk_bdev_io *parent_io = cb_arg;
uint8_t *read_buf = bdev_io->u.bdev.iovs[0].iov_base;
int i, rc = 0;
if (!success) {
parent_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
parent_io->internal.cb(parent_io, false, parent_io->internal.caller_ctx);
spdk_bdev_free_io(bdev_io);
return;
}
for (i = 0; i < parent_io->u.bdev.iovcnt; i++) {
rc = memcmp(read_buf,
parent_io->u.bdev.iovs[i].iov_base,
parent_io->u.bdev.iovs[i].iov_len);
if (rc) {
break;
}
read_buf += parent_io->u.bdev.iovs[i].iov_len;
}
spdk_bdev_free_io(bdev_io);
if (rc == 0) {
parent_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
parent_io->internal.cb(parent_io, true, parent_io->internal.caller_ctx);
} else {
parent_io->internal.status = SPDK_BDEV_IO_STATUS_MISCOMPARE;
parent_io->internal.cb(parent_io, false, parent_io->internal.caller_ctx);
}
}
static void
bdev_compare_do_read(void *_bdev_io)
{
struct spdk_bdev_io *bdev_io = _bdev_io;
int rc;
rc = spdk_bdev_read_blocks(bdev_io->internal.desc,
spdk_io_channel_from_ctx(bdev_io->internal.ch), NULL,
bdev_io->u.bdev.offset_blocks, bdev_io->u.bdev.num_blocks,
bdev_compare_do_read_done, bdev_io);
if (rc == -ENOMEM) {
bdev_queue_io_wait_with_cb(bdev_io, bdev_compare_do_read);
} else if (rc != 0) {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
bdev_io->internal.cb(bdev_io, false, bdev_io->internal.caller_ctx);
}
}
static int
bdev_comparev_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_COMPARE;
bdev_io->u.bdev.iovs = iov;
bdev_io->u.bdev.iovcnt = iovcnt;
bdev_io->u.bdev.md_buf = md_buf;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
if (bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_COMPARE)) {
bdev_io_submit(bdev_io);
return 0;
}
bdev_compare_do_read(bdev_io);
return 0;
}
int
spdk_bdev_comparev_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
return bdev_comparev_blocks_with_md(desc, ch, iov, iovcnt, NULL, offset_blocks,
num_blocks, cb, cb_arg);
}
int
spdk_bdev_comparev_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *iov, int iovcnt, void *md_buf,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
if (!spdk_bdev_is_md_separate(spdk_bdev_desc_get_bdev(desc))) {
return -EINVAL;
}
if (!_bdev_io_check_md_buf(iov, md_buf)) {
return -EINVAL;
}
return bdev_comparev_blocks_with_md(desc, ch, iov, iovcnt, md_buf, offset_blocks,
num_blocks, cb, cb_arg);
}
static int
bdev_compare_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, void *md_buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_COMPARE;
bdev_io->u.bdev.iovs = &bdev_io->iov;
bdev_io->u.bdev.iovs[0].iov_base = buf;
bdev_io->u.bdev.iovs[0].iov_len = num_blocks * bdev->blocklen;
bdev_io->u.bdev.iovcnt = 1;
bdev_io->u.bdev.md_buf = md_buf;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
if (bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_COMPARE)) {
bdev_io_submit(bdev_io);
return 0;
}
bdev_compare_do_read(bdev_io);
return 0;
}
int
spdk_bdev_compare_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
return bdev_compare_blocks_with_md(desc, ch, buf, NULL, offset_blocks, num_blocks,
cb, cb_arg);
}
int
spdk_bdev_compare_blocks_with_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
void *buf, void *md_buf, uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct iovec iov = {
.iov_base = buf,
};
if (!spdk_bdev_is_md_separate(spdk_bdev_desc_get_bdev(desc))) {
return -EINVAL;
}
if (!_bdev_io_check_md_buf(&iov, md_buf)) {
return -EINVAL;
}
return bdev_compare_blocks_with_md(desc, ch, buf, md_buf, offset_blocks, num_blocks,
cb, cb_arg);
}
static void
bdev_comparev_and_writev_blocks_unlocked(void *ctx, int unlock_status)
{
struct spdk_bdev_io *bdev_io = ctx;
if (unlock_status) {
SPDK_ERRLOG("LBA range unlock failed\n");
}
bdev_io->internal.cb(bdev_io, bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS ? true :
false, bdev_io->internal.caller_ctx);
}
static void
bdev_comparev_and_writev_blocks_unlock(struct spdk_bdev_io *bdev_io, int status)
{
bdev_io->internal.status = status;
bdev_unlock_lba_range(bdev_io->internal.desc, spdk_io_channel_from_ctx(bdev_io->internal.ch),
bdev_io->u.bdev.offset_blocks, bdev_io->u.bdev.num_blocks,
bdev_comparev_and_writev_blocks_unlocked, bdev_io);
}
static void
bdev_compare_and_write_do_write_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
struct spdk_bdev_io *parent_io = cb_arg;
if (!success) {
SPDK_ERRLOG("Compare and write operation failed\n");
}
spdk_bdev_free_io(bdev_io);
bdev_comparev_and_writev_blocks_unlock(parent_io,
success ? SPDK_BDEV_IO_STATUS_SUCCESS : SPDK_BDEV_IO_STATUS_FAILED);
}
static void
bdev_compare_and_write_do_write(void *_bdev_io)
{
struct spdk_bdev_io *bdev_io = _bdev_io;
int rc;
rc = spdk_bdev_writev_blocks(bdev_io->internal.desc,
spdk_io_channel_from_ctx(bdev_io->internal.ch),
bdev_io->u.bdev.fused_iovs, bdev_io->u.bdev.fused_iovcnt,
bdev_io->u.bdev.offset_blocks, bdev_io->u.bdev.num_blocks,
bdev_compare_and_write_do_write_done, bdev_io);
if (rc == -ENOMEM) {
bdev_queue_io_wait_with_cb(bdev_io, bdev_compare_and_write_do_write);
} else if (rc != 0) {
bdev_comparev_and_writev_blocks_unlock(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
}
}
static void
bdev_compare_and_write_do_compare_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
struct spdk_bdev_io *parent_io = cb_arg;
spdk_bdev_free_io(bdev_io);
if (!success) {
bdev_comparev_and_writev_blocks_unlock(parent_io, SPDK_BDEV_IO_STATUS_MISCOMPARE);
return;
}
bdev_compare_and_write_do_write(parent_io);
}
static void
bdev_compare_and_write_do_compare(void *_bdev_io)
{
struct spdk_bdev_io *bdev_io = _bdev_io;
int rc;
rc = spdk_bdev_comparev_blocks(bdev_io->internal.desc,
spdk_io_channel_from_ctx(bdev_io->internal.ch), bdev_io->u.bdev.iovs,
bdev_io->u.bdev.iovcnt, bdev_io->u.bdev.offset_blocks, bdev_io->u.bdev.num_blocks,
bdev_compare_and_write_do_compare_done, bdev_io);
if (rc == -ENOMEM) {
bdev_queue_io_wait_with_cb(bdev_io, bdev_compare_and_write_do_compare);
} else if (rc != 0) {
bdev_comparev_and_writev_blocks_unlock(bdev_io, SPDK_BDEV_IO_STATUS_FIRST_FUSED_FAILED);
}
}
static void
bdev_comparev_and_writev_blocks_locked(void *ctx, int status)
{
struct spdk_bdev_io *bdev_io = ctx;
if (status) {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_FIRST_FUSED_FAILED;
bdev_io->internal.cb(bdev_io, false, bdev_io->internal.caller_ctx);
}
bdev_compare_and_write_do_compare(bdev_io);
}
int
spdk_bdev_comparev_and_writev_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
struct iovec *compare_iov, int compare_iovcnt,
struct iovec *write_iov, int write_iovcnt,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
if (num_blocks > bdev->acwu) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_COMPARE_AND_WRITE;
bdev_io->u.bdev.iovs = compare_iov;
bdev_io->u.bdev.iovcnt = compare_iovcnt;
bdev_io->u.bdev.fused_iovs = write_iov;
bdev_io->u.bdev.fused_iovcnt = write_iovcnt;
bdev_io->u.bdev.md_buf = NULL;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
if (bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_COMPARE_AND_WRITE)) {
bdev_io_submit(bdev_io);
return 0;
}
return bdev_lock_lba_range(desc, ch, offset_blocks, num_blocks,
bdev_comparev_and_writev_blocks_locked, bdev_io);
}
static void
bdev_zcopy_get_buf(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io, bool success)
{
if (!success) {
/* Don't use spdk_bdev_io_complete here - this bdev_io was never actually submitted. */
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_NOMEM;
bdev_io->internal.cb(bdev_io, success, bdev_io->internal.caller_ctx);
return;
}
if (bdev_io->u.bdev.zcopy.populate) {
/* Read the real data into the buffer */
bdev_io->type = SPDK_BDEV_IO_TYPE_READ;
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_PENDING;
bdev_io_submit(bdev_io);
return;
}
/* Don't use spdk_bdev_io_complete here - this bdev_io was never actually submitted. */
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
bdev_io->internal.cb(bdev_io, success, bdev_io->internal.caller_ctx);
}
int
spdk_bdev_zcopy_start(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset_blocks, uint64_t num_blocks,
bool populate,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
if (!spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_ZCOPY)) {
return -ENOTSUP;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_ZCOPY;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io->u.bdev.iovs = NULL;
bdev_io->u.bdev.iovcnt = 0;
bdev_io->u.bdev.md_buf = NULL;
bdev_io->u.bdev.zcopy.populate = populate ? 1 : 0;
bdev_io->u.bdev.zcopy.commit = 0;
bdev_io->u.bdev.zcopy.start = 1;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
if (bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_ZCOPY)) {
bdev_io_submit(bdev_io);
} else {
/* Emulate zcopy by allocating a buffer */
spdk_bdev_io_get_buf(bdev_io, bdev_zcopy_get_buf,
bdev_io->u.bdev.num_blocks * bdev->blocklen);
}
return 0;
}
int
spdk_bdev_zcopy_end(struct spdk_bdev_io *bdev_io, bool commit,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = bdev_io->bdev;
if (bdev_io->type == SPDK_BDEV_IO_TYPE_READ) {
/* This can happen if the zcopy was emulated in start */
if (bdev_io->u.bdev.zcopy.start != 1) {
return -EINVAL;
}
bdev_io->type = SPDK_BDEV_IO_TYPE_ZCOPY;
}
if (bdev_io->type != SPDK_BDEV_IO_TYPE_ZCOPY) {
return -EINVAL;
}
bdev_io->u.bdev.zcopy.commit = commit ? 1 : 0;
bdev_io->u.bdev.zcopy.start = 0;
bdev_io->internal.caller_ctx = cb_arg;
bdev_io->internal.cb = cb;
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_PENDING;
if (bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_ZCOPY)) {
bdev_io_submit(bdev_io);
return 0;
}
if (!bdev_io->u.bdev.zcopy.commit) {
/* Don't use spdk_bdev_io_complete here - this bdev_io was never actually submitted. */
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
bdev_io->internal.cb(bdev_io, true, bdev_io->internal.caller_ctx);
return 0;
}
bdev_io->type = SPDK_BDEV_IO_TYPE_WRITE;
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_write_zeroes(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset, uint64_t len,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
len, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_write_zeroes_blocks(desc, ch, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_write_zeroes_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
if (!bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE_ZEROES) &&
!bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE)) {
return -ENOTSUP;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->type = SPDK_BDEV_IO_TYPE_WRITE_ZEROES;
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
if (bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE_ZEROES)) {
bdev_io_submit(bdev_io);
return 0;
}
assert(bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE));
assert(_bdev_get_block_size_with_md(bdev) <= ZERO_BUFFER_SIZE);
bdev_io->u.bdev.split_remaining_num_blocks = num_blocks;
bdev_io->u.bdev.split_current_offset_blocks = offset_blocks;
bdev_write_zero_buffer_next(bdev_io);
return 0;
}
int
spdk_bdev_unmap(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset, uint64_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
nbytes, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_unmap_blocks(desc, ch, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_unmap_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
if (num_blocks == 0) {
SPDK_ERRLOG("Can't unmap 0 bytes\n");
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_UNMAP;
bdev_io->u.bdev.iovs = &bdev_io->iov;
bdev_io->u.bdev.iovs[0].iov_base = NULL;
bdev_io->u.bdev.iovs[0].iov_len = 0;
bdev_io->u.bdev.iovcnt = 1;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_flush(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset, uint64_t length,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
uint64_t offset_blocks, num_blocks;
if (bdev_bytes_to_blocks(spdk_bdev_desc_get_bdev(desc), offset, &offset_blocks,
length, &num_blocks) != 0) {
return -EINVAL;
}
return spdk_bdev_flush_blocks(desc, ch, offset_blocks, num_blocks, cb, cb_arg);
}
int
spdk_bdev_flush_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
uint64_t offset_blocks, uint64_t num_blocks,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
if (!bdev_io_valid_blocks(bdev, offset_blocks, num_blocks)) {
return -EINVAL;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_FLUSH;
bdev_io->u.bdev.iovs = NULL;
bdev_io->u.bdev.iovcnt = 0;
bdev_io->u.bdev.offset_blocks = offset_blocks;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
static void
bdev_reset_dev(struct spdk_io_channel_iter *i, int status)
{
struct spdk_bdev_channel *ch = spdk_io_channel_iter_get_ctx(i);
struct spdk_bdev_io *bdev_io;
bdev_io = TAILQ_FIRST(&ch->queued_resets);
TAILQ_REMOVE(&ch->queued_resets, bdev_io, internal.link);
bdev_io_submit_reset(bdev_io);
}
static void
bdev_reset_freeze_channel(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *ch;
struct spdk_bdev_channel *channel;
struct spdk_bdev_mgmt_channel *mgmt_channel;
struct spdk_bdev_shared_resource *shared_resource;
bdev_io_tailq_t tmp_queued;
TAILQ_INIT(&tmp_queued);
ch = spdk_io_channel_iter_get_channel(i);
channel = spdk_io_channel_get_ctx(ch);
shared_resource = channel->shared_resource;
mgmt_channel = shared_resource->mgmt_ch;
channel->flags |= BDEV_CH_RESET_IN_PROGRESS;
if ((channel->flags & BDEV_CH_QOS_ENABLED) != 0) {
/* The QoS object is always valid and readable while
* the channel flag is set, so the lock here should not
* be necessary. We're not in the fast path though, so
* just take it anyway. */
pthread_mutex_lock(&channel->bdev->internal.mutex);
if (channel->bdev->internal.qos->ch == channel) {
TAILQ_SWAP(&channel->bdev->internal.qos->queued, &tmp_queued, spdk_bdev_io, internal.link);
}
pthread_mutex_unlock(&channel->bdev->internal.mutex);
}
bdev_abort_queued_io(&shared_resource->nomem_io, channel);
bdev_abort_buf_io(&mgmt_channel->need_buf_small, channel);
bdev_abort_buf_io(&mgmt_channel->need_buf_large, channel);
bdev_abort_queued_io(&tmp_queued, channel);
spdk_for_each_channel_continue(i, 0);
}
static void
bdev_start_reset(void *ctx)
{
struct spdk_bdev_channel *ch = ctx;
spdk_for_each_channel(__bdev_to_io_dev(ch->bdev), bdev_reset_freeze_channel,
ch, bdev_reset_dev);
}
static void
bdev_channel_start_reset(struct spdk_bdev_channel *ch)
{
struct spdk_bdev *bdev = ch->bdev;
assert(!TAILQ_EMPTY(&ch->queued_resets));
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev->internal.reset_in_progress == NULL) {
bdev->internal.reset_in_progress = TAILQ_FIRST(&ch->queued_resets);
/*
* Take a channel reference for the target bdev for the life of this
* reset. This guards against the channel getting destroyed while
* spdk_for_each_channel() calls related to this reset IO are in
* progress. We will release the reference when this reset is
* completed.
*/
bdev->internal.reset_in_progress->u.reset.ch_ref = spdk_get_io_channel(__bdev_to_io_dev(bdev));
bdev_start_reset(ch);
}
pthread_mutex_unlock(&bdev->internal.mutex);
}
int
spdk_bdev_reset(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->internal.submit_tsc = spdk_get_ticks();
bdev_io->type = SPDK_BDEV_IO_TYPE_RESET;
bdev_io->u.reset.ch_ref = NULL;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
pthread_mutex_lock(&bdev->internal.mutex);
TAILQ_INSERT_TAIL(&channel->queued_resets, bdev_io, internal.link);
pthread_mutex_unlock(&bdev->internal.mutex);
TAILQ_INSERT_TAIL(&bdev_io->internal.ch->io_submitted, bdev_io,
internal.ch_link);
bdev_channel_start_reset(channel);
return 0;
}
void
spdk_bdev_get_io_stat(struct spdk_bdev *bdev, struct spdk_io_channel *ch,
struct spdk_bdev_io_stat *stat)
{
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
*stat = channel->stat;
}
static void
bdev_get_device_stat_done(struct spdk_io_channel_iter *i, int status)
{
void *io_device = spdk_io_channel_iter_get_io_device(i);
struct spdk_bdev_iostat_ctx *bdev_iostat_ctx = spdk_io_channel_iter_get_ctx(i);
bdev_iostat_ctx->cb(__bdev_from_io_dev(io_device), bdev_iostat_ctx->stat,
bdev_iostat_ctx->cb_arg, 0);
free(bdev_iostat_ctx);
}
static void
bdev_get_each_channel_stat(struct spdk_io_channel_iter *i)
{
struct spdk_bdev_iostat_ctx *bdev_iostat_ctx = spdk_io_channel_iter_get_ctx(i);
struct spdk_io_channel *ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
bdev_io_stat_add(bdev_iostat_ctx->stat, &channel->stat);
spdk_for_each_channel_continue(i, 0);
}
void
spdk_bdev_get_device_stat(struct spdk_bdev *bdev, struct spdk_bdev_io_stat *stat,
spdk_bdev_get_device_stat_cb cb, void *cb_arg)
{
struct spdk_bdev_iostat_ctx *bdev_iostat_ctx;
assert(bdev != NULL);
assert(stat != NULL);
assert(cb != NULL);
bdev_iostat_ctx = calloc(1, sizeof(struct spdk_bdev_iostat_ctx));
if (bdev_iostat_ctx == NULL) {
SPDK_ERRLOG("Unable to allocate memory for spdk_bdev_iostat_ctx\n");
cb(bdev, stat, cb_arg, -ENOMEM);
return;
}
bdev_iostat_ctx->stat = stat;
bdev_iostat_ctx->cb = cb;
bdev_iostat_ctx->cb_arg = cb_arg;
/* Start with the statistics from previously deleted channels. */
pthread_mutex_lock(&bdev->internal.mutex);
bdev_io_stat_add(bdev_iostat_ctx->stat, &bdev->internal.stat);
pthread_mutex_unlock(&bdev->internal.mutex);
/* Then iterate and add the statistics from each existing channel. */
spdk_for_each_channel(__bdev_to_io_dev(bdev),
bdev_get_each_channel_stat,
bdev_iostat_ctx,
bdev_get_device_stat_done);
}
int
spdk_bdev_nvme_admin_passthru(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
const struct spdk_nvme_cmd *cmd, void *buf, size_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
return -EBADF;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_NVME_ADMIN;
bdev_io->u.nvme_passthru.cmd = *cmd;
bdev_io->u.nvme_passthru.buf = buf;
bdev_io->u.nvme_passthru.nbytes = nbytes;
bdev_io->u.nvme_passthru.md_buf = NULL;
bdev_io->u.nvme_passthru.md_len = 0;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_nvme_io_passthru(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
const struct spdk_nvme_cmd *cmd, void *buf, size_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
/*
* Do not try to parse the NVMe command - we could maybe use bits in the opcode
* to easily determine if the command is a read or write, but for now just
* do not allow io_passthru with a read-only descriptor.
*/
return -EBADF;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_NVME_IO;
bdev_io->u.nvme_passthru.cmd = *cmd;
bdev_io->u.nvme_passthru.buf = buf;
bdev_io->u.nvme_passthru.nbytes = nbytes;
bdev_io->u.nvme_passthru.md_buf = NULL;
bdev_io->u.nvme_passthru.md_len = 0;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_nvme_io_passthru_md(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
const struct spdk_nvme_cmd *cmd, void *buf, size_t nbytes, void *md_buf, size_t md_len,
spdk_bdev_io_completion_cb cb, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
if (!desc->write) {
/*
* Do not try to parse the NVMe command - we could maybe use bits in the opcode
* to easily determine if the command is a read or write, but for now just
* do not allow io_passthru with a read-only descriptor.
*/
return -EBADF;
}
bdev_io = bdev_channel_get_io(channel);
if (!bdev_io) {
return -ENOMEM;
}
bdev_io->internal.ch = channel;
bdev_io->internal.desc = desc;
bdev_io->type = SPDK_BDEV_IO_TYPE_NVME_IO_MD;
bdev_io->u.nvme_passthru.cmd = *cmd;
bdev_io->u.nvme_passthru.buf = buf;
bdev_io->u.nvme_passthru.nbytes = nbytes;
bdev_io->u.nvme_passthru.md_buf = md_buf;
bdev_io->u.nvme_passthru.md_len = md_len;
bdev_io_init(bdev_io, bdev, cb_arg, cb);
bdev_io_submit(bdev_io);
return 0;
}
int
spdk_bdev_queue_io_wait(struct spdk_bdev *bdev, struct spdk_io_channel *ch,
struct spdk_bdev_io_wait_entry *entry)
{
struct spdk_bdev_channel *channel = spdk_io_channel_get_ctx(ch);
struct spdk_bdev_mgmt_channel *mgmt_ch = channel->shared_resource->mgmt_ch;
if (bdev != entry->bdev) {
SPDK_ERRLOG("bdevs do not match\n");
return -EINVAL;
}
if (mgmt_ch->per_thread_cache_count > 0) {
SPDK_ERRLOG("Cannot queue io_wait if spdk_bdev_io available in per-thread cache\n");
return -EINVAL;
}
TAILQ_INSERT_TAIL(&mgmt_ch->io_wait_queue, entry, link);
return 0;
}
static void
bdev_ch_retry_io(struct spdk_bdev_channel *bdev_ch)
{
struct spdk_bdev *bdev = bdev_ch->bdev;
struct spdk_bdev_shared_resource *shared_resource = bdev_ch->shared_resource;
struct spdk_bdev_io *bdev_io;
if (shared_resource->io_outstanding > shared_resource->nomem_threshold) {
/*
* Allow some more I/O to complete before retrying the nomem_io queue.
* Some drivers (such as nvme) cannot immediately take a new I/O in
* the context of a completion, because the resources for the I/O are
* not released until control returns to the bdev poller. Also, we
* may require several small I/O to complete before a larger I/O
* (that requires splitting) can be submitted.
*/
return;
}
while (!TAILQ_EMPTY(&shared_resource->nomem_io)) {
bdev_io = TAILQ_FIRST(&shared_resource->nomem_io);
TAILQ_REMOVE(&shared_resource->nomem_io, bdev_io, internal.link);
bdev_io->internal.ch->io_outstanding++;
shared_resource->io_outstanding++;
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_PENDING;
bdev_io->internal.error.nvme.cdw0 = 0;
bdev_io->num_retries++;
bdev->fn_table->submit_request(spdk_bdev_io_get_io_channel(bdev_io), bdev_io);
if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_NOMEM) {
break;
}
}
}
static inline void
bdev_io_complete(void *ctx)
{
struct spdk_bdev_io *bdev_io = ctx;
struct spdk_bdev_channel *bdev_ch = bdev_io->internal.ch;
uint64_t tsc, tsc_diff;
if (spdk_unlikely(bdev_io->internal.in_submit_request || bdev_io->internal.io_submit_ch)) {
/*
* Send the completion to the thread that originally submitted the I/O,
* which may not be the current thread in the case of QoS.
*/
if (bdev_io->internal.io_submit_ch) {
bdev_io->internal.ch = bdev_io->internal.io_submit_ch;
bdev_io->internal.io_submit_ch = NULL;
}
/*
* Defer completion to avoid potential infinite recursion if the
* user's completion callback issues a new I/O.
*/
spdk_thread_send_msg(spdk_bdev_io_get_thread(bdev_io),
bdev_io_complete, bdev_io);
return;
}
tsc = spdk_get_ticks();
tsc_diff = tsc - bdev_io->internal.submit_tsc;
spdk_trace_record_tsc(tsc, TRACE_BDEV_IO_DONE, 0, 0, (uintptr_t)bdev_io, 0);
/* When a bdev_io is split, the children bdev_io are not added
* to the io_submitted list. So don't try to remove them in that
* case.
*/
if (bdev_io->internal.cb != bdev_io_split_done) {
TAILQ_REMOVE(&bdev_ch->io_submitted, bdev_io, internal.ch_link);
}
if (bdev_io->internal.ch->histogram) {
spdk_histogram_data_tally(bdev_io->internal.ch->histogram, tsc_diff);
}
if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS) {
switch (bdev_io->type) {
case SPDK_BDEV_IO_TYPE_READ:
bdev_io->internal.ch->stat.bytes_read += bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
bdev_io->internal.ch->stat.num_read_ops++;
bdev_io->internal.ch->stat.read_latency_ticks += tsc_diff;
break;
case SPDK_BDEV_IO_TYPE_WRITE:
bdev_io->internal.ch->stat.bytes_written += bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
bdev_io->internal.ch->stat.num_write_ops++;
bdev_io->internal.ch->stat.write_latency_ticks += tsc_diff;
break;
case SPDK_BDEV_IO_TYPE_UNMAP:
bdev_io->internal.ch->stat.bytes_unmapped += bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
bdev_io->internal.ch->stat.num_unmap_ops++;
bdev_io->internal.ch->stat.unmap_latency_ticks += tsc_diff;
break;
case SPDK_BDEV_IO_TYPE_ZCOPY:
/* Track the data in the start phase only */
if (bdev_io->u.bdev.zcopy.start) {
if (bdev_io->u.bdev.zcopy.populate) {
bdev_io->internal.ch->stat.bytes_read +=
bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
bdev_io->internal.ch->stat.num_read_ops++;
bdev_io->internal.ch->stat.read_latency_ticks += tsc_diff;
} else {
bdev_io->internal.ch->stat.bytes_written +=
bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
bdev_io->internal.ch->stat.num_write_ops++;
bdev_io->internal.ch->stat.write_latency_ticks += tsc_diff;
}
}
break;
default:
break;
}
}
#ifdef SPDK_CONFIG_VTUNE
uint64_t now_tsc = spdk_get_ticks();
if (now_tsc > (bdev_io->internal.ch->start_tsc + bdev_io->internal.ch->interval_tsc)) {
uint64_t data[5];
data[0] = bdev_io->internal.ch->stat.num_read_ops - bdev_io->internal.ch->prev_stat.num_read_ops;
data[1] = bdev_io->internal.ch->stat.bytes_read - bdev_io->internal.ch->prev_stat.bytes_read;
data[2] = bdev_io->internal.ch->stat.num_write_ops - bdev_io->internal.ch->prev_stat.num_write_ops;
data[3] = bdev_io->internal.ch->stat.bytes_written - bdev_io->internal.ch->prev_stat.bytes_written;
data[4] = bdev_io->bdev->fn_table->get_spin_time ?
bdev_io->bdev->fn_table->get_spin_time(spdk_bdev_io_get_io_channel(bdev_io)) : 0;
__itt_metadata_add(g_bdev_mgr.domain, __itt_null, bdev_io->internal.ch->handle,
__itt_metadata_u64, 5, data);
bdev_io->internal.ch->prev_stat = bdev_io->internal.ch->stat;
bdev_io->internal.ch->start_tsc = now_tsc;
}
#endif
assert(bdev_io->internal.cb != NULL);
assert(spdk_get_thread() == spdk_bdev_io_get_thread(bdev_io));
bdev_io->internal.cb(bdev_io, bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS,
bdev_io->internal.caller_ctx);
}
static void
bdev_reset_complete(struct spdk_io_channel_iter *i, int status)
{
struct spdk_bdev_io *bdev_io = spdk_io_channel_iter_get_ctx(i);
if (bdev_io->u.reset.ch_ref != NULL) {
spdk_put_io_channel(bdev_io->u.reset.ch_ref);
bdev_io->u.reset.ch_ref = NULL;
}
bdev_io_complete(bdev_io);
}
static void
bdev_unfreeze_channel(struct spdk_io_channel_iter *i)
{
struct spdk_bdev_io *bdev_io = spdk_io_channel_iter_get_ctx(i);
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct spdk_bdev_io *queued_reset;
ch->flags &= ~BDEV_CH_RESET_IN_PROGRESS;
while (!TAILQ_EMPTY(&ch->queued_resets)) {
queued_reset = TAILQ_FIRST(&ch->queued_resets);
TAILQ_REMOVE(&ch->queued_resets, queued_reset, internal.link);
spdk_bdev_io_complete(queued_reset, bdev_io->internal.status);
}
spdk_for_each_channel_continue(i, 0);
}
void
spdk_bdev_io_complete(struct spdk_bdev_io *bdev_io, enum spdk_bdev_io_status status)
{
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_bdev_channel *bdev_ch = bdev_io->internal.ch;
struct spdk_bdev_shared_resource *shared_resource = bdev_ch->shared_resource;
bdev_io->internal.status = status;
if (spdk_unlikely(bdev_io->type == SPDK_BDEV_IO_TYPE_RESET)) {
bool unlock_channels = false;
if (status == SPDK_BDEV_IO_STATUS_NOMEM) {
SPDK_ERRLOG("NOMEM returned for reset\n");
}
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev_io == bdev->internal.reset_in_progress) {
bdev->internal.reset_in_progress = NULL;
unlock_channels = true;
}
pthread_mutex_unlock(&bdev->internal.mutex);
if (unlock_channels) {
spdk_for_each_channel(__bdev_to_io_dev(bdev), bdev_unfreeze_channel,
bdev_io, bdev_reset_complete);
return;
}
} else {
_bdev_io_unset_bounce_buf(bdev_io);
assert(bdev_ch->io_outstanding > 0);
assert(shared_resource->io_outstanding > 0);
bdev_ch->io_outstanding--;
shared_resource->io_outstanding--;
if (spdk_unlikely(status == SPDK_BDEV_IO_STATUS_NOMEM)) {
TAILQ_INSERT_HEAD(&shared_resource->nomem_io, bdev_io, internal.link);
/*
* Wait for some of the outstanding I/O to complete before we
* retry any of the nomem_io. Normally we will wait for
* NOMEM_THRESHOLD_COUNT I/O to complete but for low queue
* depth channels we will instead wait for half to complete.
*/
shared_resource->nomem_threshold = spdk_max((int64_t)shared_resource->io_outstanding / 2,
(int64_t)shared_resource->io_outstanding - NOMEM_THRESHOLD_COUNT);
return;
}
if (spdk_unlikely(!TAILQ_EMPTY(&shared_resource->nomem_io))) {
bdev_ch_retry_io(bdev_ch);
}
}
bdev_io_complete(bdev_io);
}
void
spdk_bdev_io_complete_scsi_status(struct spdk_bdev_io *bdev_io, enum spdk_scsi_status sc,
enum spdk_scsi_sense sk, uint8_t asc, uint8_t ascq)
{
if (sc == SPDK_SCSI_STATUS_GOOD) {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
} else {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_SCSI_ERROR;
bdev_io->internal.error.scsi.sc = sc;
bdev_io->internal.error.scsi.sk = sk;
bdev_io->internal.error.scsi.asc = asc;
bdev_io->internal.error.scsi.ascq = ascq;
}
spdk_bdev_io_complete(bdev_io, bdev_io->internal.status);
}
void
spdk_bdev_io_get_scsi_status(const struct spdk_bdev_io *bdev_io,
int *sc, int *sk, int *asc, int *ascq)
{
assert(sc != NULL);
assert(sk != NULL);
assert(asc != NULL);
assert(ascq != NULL);
switch (bdev_io->internal.status) {
case SPDK_BDEV_IO_STATUS_SUCCESS:
*sc = SPDK_SCSI_STATUS_GOOD;
*sk = SPDK_SCSI_SENSE_NO_SENSE;
*asc = SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE;
*ascq = SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
break;
case SPDK_BDEV_IO_STATUS_NVME_ERROR:
spdk_scsi_nvme_translate(bdev_io, sc, sk, asc, ascq);
break;
case SPDK_BDEV_IO_STATUS_SCSI_ERROR:
*sc = bdev_io->internal.error.scsi.sc;
*sk = bdev_io->internal.error.scsi.sk;
*asc = bdev_io->internal.error.scsi.asc;
*ascq = bdev_io->internal.error.scsi.ascq;
break;
default:
*sc = SPDK_SCSI_STATUS_CHECK_CONDITION;
*sk = SPDK_SCSI_SENSE_ABORTED_COMMAND;
*asc = SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE;
*ascq = SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
break;
}
}
void
spdk_bdev_io_complete_nvme_status(struct spdk_bdev_io *bdev_io, uint32_t cdw0, int sct, int sc)
{
if (sct == SPDK_NVME_SCT_GENERIC && sc == SPDK_NVME_SC_SUCCESS) {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
} else {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_NVME_ERROR;
}
bdev_io->internal.error.nvme.cdw0 = cdw0;
bdev_io->internal.error.nvme.sct = sct;
bdev_io->internal.error.nvme.sc = sc;
spdk_bdev_io_complete(bdev_io, bdev_io->internal.status);
}
void
spdk_bdev_io_get_nvme_status(const struct spdk_bdev_io *bdev_io, uint32_t *cdw0, int *sct, int *sc)
{
assert(sct != NULL);
assert(sc != NULL);
assert(cdw0 != NULL);
if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_NVME_ERROR) {
*sct = bdev_io->internal.error.nvme.sct;
*sc = bdev_io->internal.error.nvme.sc;
} else if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS) {
*sct = SPDK_NVME_SCT_GENERIC;
*sc = SPDK_NVME_SC_SUCCESS;
} else {
*sct = SPDK_NVME_SCT_GENERIC;
*sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
}
*cdw0 = bdev_io->internal.error.nvme.cdw0;
}
void
spdk_bdev_io_get_nvme_fused_status(const struct spdk_bdev_io *bdev_io, uint32_t *cdw0,
int *first_sct, int *first_sc, int *second_sct, int *second_sc)
{
assert(first_sct != NULL);
assert(first_sc != NULL);
assert(second_sct != NULL);
assert(second_sc != NULL);
assert(cdw0 != NULL);
if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_NVME_ERROR) {
if (bdev_io->internal.error.nvme.sct == SPDK_NVME_SCT_MEDIA_ERROR &&
bdev_io->internal.error.nvme.sc == SPDK_NVME_SC_COMPARE_FAILURE) {
*first_sct = bdev_io->internal.error.nvme.sct;
*first_sc = bdev_io->internal.error.nvme.sc;
*second_sct = SPDK_NVME_SCT_GENERIC;
*second_sc = SPDK_NVME_SC_ABORTED_FAILED_FUSED;
} else {
*first_sct = SPDK_NVME_SCT_GENERIC;
*first_sc = SPDK_NVME_SC_SUCCESS;
*second_sct = bdev_io->internal.error.nvme.sct;
*second_sc = bdev_io->internal.error.nvme.sc;
}
} else if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_SUCCESS) {
*first_sct = SPDK_NVME_SCT_GENERIC;
*first_sc = SPDK_NVME_SC_SUCCESS;
*second_sct = SPDK_NVME_SCT_GENERIC;
*second_sc = SPDK_NVME_SC_SUCCESS;
} else if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_FIRST_FUSED_FAILED) {
*first_sct = SPDK_NVME_SCT_GENERIC;
*first_sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
*second_sct = SPDK_NVME_SCT_GENERIC;
*second_sc = SPDK_NVME_SC_ABORTED_FAILED_FUSED;
} else if (bdev_io->internal.status == SPDK_BDEV_IO_STATUS_MISCOMPARE) {
*first_sct = SPDK_NVME_SCT_MEDIA_ERROR;
*first_sc = SPDK_NVME_SC_COMPARE_FAILURE;
*second_sct = SPDK_NVME_SCT_GENERIC;
*second_sc = SPDK_NVME_SC_ABORTED_FAILED_FUSED;
} else {
*first_sct = SPDK_NVME_SCT_GENERIC;
*first_sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
*second_sct = SPDK_NVME_SCT_GENERIC;
*second_sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
}
*cdw0 = bdev_io->internal.error.nvme.cdw0;
}
struct spdk_thread *
spdk_bdev_io_get_thread(struct spdk_bdev_io *bdev_io)
{
return spdk_io_channel_get_thread(bdev_io->internal.ch->channel);
}
struct spdk_io_channel *
spdk_bdev_io_get_io_channel(struct spdk_bdev_io *bdev_io)
{
return bdev_io->internal.ch->channel;
}
static void
bdev_qos_config_limit(struct spdk_bdev *bdev, uint64_t *limits)
{
uint64_t min_qos_set;
int i;
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (limits[i] != SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
break;
}
}
if (i == SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES) {
SPDK_ERRLOG("Invalid rate limits set.\n");
return;
}
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (limits[i] == SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
continue;
}
if (bdev_qos_is_iops_rate_limit(i) == true) {
min_qos_set = SPDK_BDEV_QOS_MIN_IOS_PER_SEC;
} else {
min_qos_set = SPDK_BDEV_QOS_MIN_BYTES_PER_SEC;
}
if (limits[i] == 0 || limits[i] % min_qos_set) {
SPDK_ERRLOG("Assigned limit %" PRIu64 " on bdev %s is not multiple of %" PRIu64 "\n",
limits[i], bdev->name, min_qos_set);
SPDK_ERRLOG("Failed to enable QoS on this bdev %s\n", bdev->name);
return;
}
}
if (!bdev->internal.qos) {
bdev->internal.qos = calloc(1, sizeof(*bdev->internal.qos));
if (!bdev->internal.qos) {
SPDK_ERRLOG("Unable to allocate memory for QoS tracking\n");
return;
}
}
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
bdev->internal.qos->rate_limits[i].limit = limits[i];
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Bdev:%s QoS type:%d set:%lu\n",
bdev->name, i, limits[i]);
}
return;
}
static void
bdev_qos_config(struct spdk_bdev *bdev)
{
struct spdk_conf_section *sp = NULL;
const char *val = NULL;
int i = 0, j = 0;
uint64_t limits[SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES] = {};
bool config_qos = false;
sp = spdk_conf_find_section(NULL, "QoS");
if (!sp) {
return;
}
while (j < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES) {
limits[j] = SPDK_BDEV_QOS_LIMIT_NOT_DEFINED;
i = 0;
while (true) {
val = spdk_conf_section_get_nmval(sp, qos_conf_type[j], i, 0);
if (!val) {
break;
}
if (strcmp(bdev->name, val) != 0) {
i++;
continue;
}
val = spdk_conf_section_get_nmval(sp, qos_conf_type[j], i, 1);
if (val) {
if (bdev_qos_is_iops_rate_limit(j) == true) {
limits[j] = strtoull(val, NULL, 10);
} else {
limits[j] = strtoull(val, NULL, 10) * 1024 * 1024;
}
config_qos = true;
}
break;
}
j++;
}
if (config_qos == true) {
bdev_qos_config_limit(bdev, limits);
}
return;
}
static int
bdev_init(struct spdk_bdev *bdev)
{
char *bdev_name;
assert(bdev->module != NULL);
if (!bdev->name) {
SPDK_ERRLOG("Bdev name is NULL\n");
return -EINVAL;
}
if (!strlen(bdev->name)) {
SPDK_ERRLOG("Bdev name must not be an empty string\n");
return -EINVAL;
}
if (spdk_bdev_get_by_name(bdev->name)) {
SPDK_ERRLOG("Bdev name:%s already exists\n", bdev->name);
return -EEXIST;
}
/* Users often register their own I/O devices using the bdev name. In
* order to avoid conflicts, prepend bdev_. */
bdev_name = spdk_sprintf_alloc("bdev_%s", bdev->name);
if (!bdev_name) {
SPDK_ERRLOG("Unable to allocate memory for internal bdev name.\n");
return -ENOMEM;
}
bdev->internal.status = SPDK_BDEV_STATUS_READY;
bdev->internal.measured_queue_depth = UINT64_MAX;
bdev->internal.claim_module = NULL;
bdev->internal.qd_poller = NULL;
bdev->internal.qos = NULL;
/* If the user didn't specify a uuid, generate one. */
if (spdk_mem_all_zero(&bdev->uuid, sizeof(bdev->uuid))) {
spdk_uuid_generate(&bdev->uuid);
}
if (spdk_bdev_get_buf_align(bdev) > 1) {
if (bdev->split_on_optimal_io_boundary) {
bdev->optimal_io_boundary = spdk_min(bdev->optimal_io_boundary,
SPDK_BDEV_LARGE_BUF_MAX_SIZE / bdev->blocklen);
} else {
bdev->split_on_optimal_io_boundary = true;
bdev->optimal_io_boundary = SPDK_BDEV_LARGE_BUF_MAX_SIZE / bdev->blocklen;
}
}
/* If the user didn't specify a write unit size, set it to one. */
if (bdev->write_unit_size == 0) {
bdev->write_unit_size = 1;
}
/* Set ACWU value to 1 if bdev module did not set it (does not support it natively) */
if (bdev->acwu == 0) {
bdev->acwu = 1;
}
TAILQ_INIT(&bdev->internal.open_descs);
TAILQ_INIT(&bdev->internal.locked_ranges);
TAILQ_INIT(&bdev->internal.pending_locked_ranges);
TAILQ_INIT(&bdev->aliases);
bdev->internal.reset_in_progress = NULL;
bdev_qos_config(bdev);
spdk_io_device_register(__bdev_to_io_dev(bdev),
bdev_channel_create, bdev_channel_destroy,
sizeof(struct spdk_bdev_channel),
bdev_name);
free(bdev_name);
pthread_mutex_init(&bdev->internal.mutex, NULL);
return 0;
}
static void
bdev_destroy_cb(void *io_device)
{
int rc;
struct spdk_bdev *bdev;
spdk_bdev_unregister_cb cb_fn;
void *cb_arg;
bdev = __bdev_from_io_dev(io_device);
cb_fn = bdev->internal.unregister_cb;
cb_arg = bdev->internal.unregister_ctx;
rc = bdev->fn_table->destruct(bdev->ctxt);
if (rc < 0) {
SPDK_ERRLOG("destruct failed\n");
}
if (rc <= 0 && cb_fn != NULL) {
cb_fn(cb_arg, rc);
}
}
static void
bdev_fini(struct spdk_bdev *bdev)
{
pthread_mutex_destroy(&bdev->internal.mutex);
free(bdev->internal.qos);
spdk_io_device_unregister(__bdev_to_io_dev(bdev), bdev_destroy_cb);
}
static void
bdev_start(struct spdk_bdev *bdev)
{
struct spdk_bdev_module *module;
uint32_t action;
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Inserting bdev %s into list\n", bdev->name);
TAILQ_INSERT_TAIL(&g_bdev_mgr.bdevs, bdev, internal.link);
/* Examine configuration before initializing I/O */
TAILQ_FOREACH(module, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (module->examine_config && bdev_ok_to_examine(bdev)) {
action = module->internal.action_in_progress;
module->internal.action_in_progress++;
module->examine_config(bdev);
if (action != module->internal.action_in_progress) {
SPDK_ERRLOG("examine_config for module %s did not call spdk_bdev_module_examine_done()\n",
module->name);
}
}
}
if (bdev->internal.claim_module && bdev_ok_to_examine(bdev)) {
if (bdev->internal.claim_module->examine_disk) {
bdev->internal.claim_module->internal.action_in_progress++;
bdev->internal.claim_module->examine_disk(bdev);
}
return;
}
TAILQ_FOREACH(module, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (module->examine_disk && bdev_ok_to_examine(bdev)) {
module->internal.action_in_progress++;
module->examine_disk(bdev);
}
}
}
int
spdk_bdev_register(struct spdk_bdev *bdev)
{
int rc = bdev_init(bdev);
if (rc == 0) {
bdev_start(bdev);
}
spdk_notify_send("bdev_register", spdk_bdev_get_name(bdev));
return rc;
}
int
spdk_vbdev_register(struct spdk_bdev *vbdev, struct spdk_bdev **base_bdevs, int base_bdev_count)
{
SPDK_ERRLOG("This function is deprecated. Use spdk_bdev_register() instead.\n");
return spdk_bdev_register(vbdev);
}
void
spdk_bdev_destruct_done(struct spdk_bdev *bdev, int bdeverrno)
{
if (bdev->internal.unregister_cb != NULL) {
bdev->internal.unregister_cb(bdev->internal.unregister_ctx, bdeverrno);
}
}
static void
_remove_notify(void *arg)
{
struct spdk_bdev_desc *desc = arg;
pthread_mutex_lock(&desc->mutex);
desc->refs--;
if (!desc->closed) {
pthread_mutex_unlock(&desc->mutex);
if (desc->callback.open_with_ext) {
desc->callback.event_fn(SPDK_BDEV_EVENT_REMOVE, desc->bdev, desc->callback.ctx);
} else {
desc->callback.remove_fn(desc->callback.ctx);
}
return;
} else if (0 == desc->refs) {
/* This descriptor was closed after this remove_notify message was sent.
* spdk_bdev_close() could not free the descriptor since this message was
* in flight, so we free it now using bdev_desc_free().
*/
pthread_mutex_unlock(&desc->mutex);
bdev_desc_free(desc);
return;
}
pthread_mutex_unlock(&desc->mutex);
}
/* Must be called while holding bdev->internal.mutex.
* returns: 0 - bdev removed and ready to be destructed.
* -EBUSY - bdev can't be destructed yet. */
static int
bdev_unregister_unsafe(struct spdk_bdev *bdev)
{
struct spdk_bdev_desc *desc, *tmp;
int rc = 0;
/* Notify each descriptor about hotremoval */
TAILQ_FOREACH_SAFE(desc, &bdev->internal.open_descs, link, tmp) {
rc = -EBUSY;
pthread_mutex_lock(&desc->mutex);
/*
* Defer invocation of the event_cb to a separate message that will
* run later on its thread. This ensures this context unwinds and
* we don't recursively unregister this bdev again if the event_cb
* immediately closes its descriptor.
*/
desc->refs++;
spdk_thread_send_msg(desc->thread, _remove_notify, desc);
pthread_mutex_unlock(&desc->mutex);
}
/* If there are no descriptors, proceed removing the bdev */
if (rc == 0) {
TAILQ_REMOVE(&g_bdev_mgr.bdevs, bdev, internal.link);
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Removing bdev %s from list done\n", bdev->name);
spdk_notify_send("bdev_unregister", spdk_bdev_get_name(bdev));
}
return rc;
}
void
spdk_bdev_unregister(struct spdk_bdev *bdev, spdk_bdev_unregister_cb cb_fn, void *cb_arg)
{
struct spdk_thread *thread;
int rc;
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Removing bdev %s from list\n", bdev->name);
thread = spdk_get_thread();
if (!thread) {
/* The user called this from a non-SPDK thread. */
if (cb_fn != NULL) {
cb_fn(cb_arg, -ENOTSUP);
}
return;
}
pthread_mutex_lock(&g_bdev_mgr.mutex);
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev->internal.status == SPDK_BDEV_STATUS_REMOVING) {
pthread_mutex_unlock(&bdev->internal.mutex);
pthread_mutex_unlock(&g_bdev_mgr.mutex);
if (cb_fn) {
cb_fn(cb_arg, -EBUSY);
}
return;
}
bdev->internal.status = SPDK_BDEV_STATUS_REMOVING;
bdev->internal.unregister_cb = cb_fn;
bdev->internal.unregister_ctx = cb_arg;
/* Call under lock. */
rc = bdev_unregister_unsafe(bdev);
pthread_mutex_unlock(&bdev->internal.mutex);
pthread_mutex_unlock(&g_bdev_mgr.mutex);
if (rc == 0) {
bdev_fini(bdev);
}
}
static void
bdev_dummy_event_cb(void *remove_ctx)
{
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Bdev remove event received with no remove callback specified");
}
static int
bdev_start_qos(struct spdk_bdev *bdev)
{
struct set_qos_limit_ctx *ctx;
/* Enable QoS */
if (bdev->internal.qos && bdev->internal.qos->thread == NULL) {
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
SPDK_ERRLOG("Failed to allocate memory for QoS context\n");
return -ENOMEM;
}
ctx->bdev = bdev;
spdk_for_each_channel(__bdev_to_io_dev(bdev),
bdev_enable_qos_msg, ctx,
bdev_enable_qos_done);
}
return 0;
}
static int
bdev_open(struct spdk_bdev *bdev, bool write, struct spdk_bdev_desc *desc)
{
struct spdk_thread *thread;
int rc = 0;
thread = spdk_get_thread();
if (!thread) {
SPDK_ERRLOG("Cannot open bdev from non-SPDK thread.\n");
return -ENOTSUP;
}
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Opening descriptor %p for bdev %s on thread %p\n", desc, bdev->name,
spdk_get_thread());
desc->bdev = bdev;
desc->thread = thread;
desc->write = write;
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev->internal.status == SPDK_BDEV_STATUS_REMOVING) {
pthread_mutex_unlock(&bdev->internal.mutex);
return -ENODEV;
}
if (write && bdev->internal.claim_module) {
SPDK_ERRLOG("Could not open %s - %s module already claimed it\n",
bdev->name, bdev->internal.claim_module->name);
pthread_mutex_unlock(&bdev->internal.mutex);
return -EPERM;
}
rc = bdev_start_qos(bdev);
if (rc != 0) {
SPDK_ERRLOG("Failed to start QoS on bdev %s\n", bdev->name);
pthread_mutex_unlock(&bdev->internal.mutex);
return rc;
}
TAILQ_INSERT_TAIL(&bdev->internal.open_descs, desc, link);
pthread_mutex_unlock(&bdev->internal.mutex);
return 0;
}
int
spdk_bdev_open(struct spdk_bdev *bdev, bool write, spdk_bdev_remove_cb_t remove_cb,
void *remove_ctx, struct spdk_bdev_desc **_desc)
{
struct spdk_bdev_desc *desc;
int rc;
desc = calloc(1, sizeof(*desc));
if (desc == NULL) {
SPDK_ERRLOG("Failed to allocate memory for bdev descriptor\n");
return -ENOMEM;
}
if (remove_cb == NULL) {
remove_cb = bdev_dummy_event_cb;
}
TAILQ_INIT(&desc->pending_media_events);
TAILQ_INIT(&desc->free_media_events);
desc->callback.open_with_ext = false;
desc->callback.remove_fn = remove_cb;
desc->callback.ctx = remove_ctx;
pthread_mutex_init(&desc->mutex, NULL);
pthread_mutex_lock(&g_bdev_mgr.mutex);
rc = bdev_open(bdev, write, desc);
if (rc != 0) {
bdev_desc_free(desc);
desc = NULL;
}
*_desc = desc;
pthread_mutex_unlock(&g_bdev_mgr.mutex);
return rc;
}
int
spdk_bdev_open_ext(const char *bdev_name, bool write, spdk_bdev_event_cb_t event_cb,
void *event_ctx, struct spdk_bdev_desc **_desc)
{
struct spdk_bdev_desc *desc;
struct spdk_bdev *bdev;
unsigned int event_id;
int rc;
if (event_cb == NULL) {
SPDK_ERRLOG("Missing event callback function\n");
return -EINVAL;
}
pthread_mutex_lock(&g_bdev_mgr.mutex);
bdev = spdk_bdev_get_by_name(bdev_name);
if (bdev == NULL) {
SPDK_ERRLOG("Failed to find bdev with name: %s\n", bdev_name);
pthread_mutex_unlock(&g_bdev_mgr.mutex);
return -EINVAL;
}
desc = calloc(1, sizeof(*desc));
if (desc == NULL) {
SPDK_ERRLOG("Failed to allocate memory for bdev descriptor\n");
pthread_mutex_unlock(&g_bdev_mgr.mutex);
return -ENOMEM;
}
TAILQ_INIT(&desc->pending_media_events);
TAILQ_INIT(&desc->free_media_events);
desc->callback.open_with_ext = true;
desc->callback.event_fn = event_cb;
desc->callback.ctx = event_ctx;
pthread_mutex_init(&desc->mutex, NULL);
if (bdev->media_events) {
desc->media_events_buffer = calloc(MEDIA_EVENT_POOL_SIZE,
sizeof(*desc->media_events_buffer));
if (desc->media_events_buffer == NULL) {
SPDK_ERRLOG("Failed to initialize media event pool\n");
bdev_desc_free(desc);
pthread_mutex_unlock(&g_bdev_mgr.mutex);
return -ENOMEM;
}
for (event_id = 0; event_id < MEDIA_EVENT_POOL_SIZE; ++event_id) {
TAILQ_INSERT_TAIL(&desc->free_media_events,
&desc->media_events_buffer[event_id], tailq);
}
}
rc = bdev_open(bdev, write, desc);
if (rc != 0) {
bdev_desc_free(desc);
desc = NULL;
}
*_desc = desc;
pthread_mutex_unlock(&g_bdev_mgr.mutex);
return rc;
}
void
spdk_bdev_close(struct spdk_bdev_desc *desc)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
int rc;
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Closing descriptor %p for bdev %s on thread %p\n", desc, bdev->name,
spdk_get_thread());
assert(desc->thread == spdk_get_thread());
spdk_poller_unregister(&desc->io_timeout_poller);
pthread_mutex_lock(&bdev->internal.mutex);
pthread_mutex_lock(&desc->mutex);
TAILQ_REMOVE(&bdev->internal.open_descs, desc, link);
desc->closed = true;
if (0 == desc->refs) {
pthread_mutex_unlock(&desc->mutex);
bdev_desc_free(desc);
} else {
pthread_mutex_unlock(&desc->mutex);
}
/* If no more descriptors, kill QoS channel */
if (bdev->internal.qos && TAILQ_EMPTY(&bdev->internal.open_descs)) {
SPDK_DEBUGLOG(SPDK_LOG_BDEV, "Closed last descriptor for bdev %s on thread %p. Stopping QoS.\n",
bdev->name, spdk_get_thread());
if (bdev_qos_destroy(bdev)) {
/* There isn't anything we can do to recover here. Just let the
* old QoS poller keep running. The QoS handling won't change
* cores when the user allocates a new channel, but it won't break. */
SPDK_ERRLOG("Unable to shut down QoS poller. It will continue running on the current thread.\n");
}
}
spdk_bdev_set_qd_sampling_period(bdev, 0);
if (bdev->internal.status == SPDK_BDEV_STATUS_REMOVING && TAILQ_EMPTY(&bdev->internal.open_descs)) {
rc = bdev_unregister_unsafe(bdev);
pthread_mutex_unlock(&bdev->internal.mutex);
if (rc == 0) {
bdev_fini(bdev);
}
} else {
pthread_mutex_unlock(&bdev->internal.mutex);
}
}
int
spdk_bdev_module_claim_bdev(struct spdk_bdev *bdev, struct spdk_bdev_desc *desc,
struct spdk_bdev_module *module)
{
if (bdev->internal.claim_module != NULL) {
SPDK_ERRLOG("bdev %s already claimed by module %s\n", bdev->name,
bdev->internal.claim_module->name);
return -EPERM;
}
if (desc && !desc->write) {
desc->write = true;
}
bdev->internal.claim_module = module;
return 0;
}
void
spdk_bdev_module_release_bdev(struct spdk_bdev *bdev)
{
assert(bdev->internal.claim_module != NULL);
bdev->internal.claim_module = NULL;
}
struct spdk_bdev *
spdk_bdev_desc_get_bdev(struct spdk_bdev_desc *desc)
{
assert(desc != NULL);
return desc->bdev;
}
void
spdk_bdev_io_get_iovec(struct spdk_bdev_io *bdev_io, struct iovec **iovp, int *iovcntp)
{
struct iovec *iovs;
int iovcnt;
if (bdev_io == NULL) {
return;
}
switch (bdev_io->type) {
case SPDK_BDEV_IO_TYPE_READ:
case SPDK_BDEV_IO_TYPE_WRITE:
case SPDK_BDEV_IO_TYPE_ZCOPY:
iovs = bdev_io->u.bdev.iovs;
iovcnt = bdev_io->u.bdev.iovcnt;
break;
default:
iovs = NULL;
iovcnt = 0;
break;
}
if (iovp) {
*iovp = iovs;
}
if (iovcntp) {
*iovcntp = iovcnt;
}
}
void *
spdk_bdev_io_get_md_buf(struct spdk_bdev_io *bdev_io)
{
if (bdev_io == NULL) {
return NULL;
}
if (!spdk_bdev_is_md_separate(bdev_io->bdev)) {
return NULL;
}
if (bdev_io->type == SPDK_BDEV_IO_TYPE_READ ||
bdev_io->type == SPDK_BDEV_IO_TYPE_WRITE) {
return bdev_io->u.bdev.md_buf;
}
return NULL;
}
void
spdk_bdev_module_list_add(struct spdk_bdev_module *bdev_module)
{
if (spdk_bdev_module_list_find(bdev_module->name)) {
SPDK_ERRLOG("ERROR: module '%s' already registered.\n", bdev_module->name);
assert(false);
}
/*
* Modules with examine callbacks must be initialized first, so they are
* ready to handle examine callbacks from later modules that will
* register physical bdevs.
*/
if (bdev_module->examine_config != NULL || bdev_module->examine_disk != NULL) {
TAILQ_INSERT_HEAD(&g_bdev_mgr.bdev_modules, bdev_module, internal.tailq);
} else {
TAILQ_INSERT_TAIL(&g_bdev_mgr.bdev_modules, bdev_module, internal.tailq);
}
}
struct spdk_bdev_module *
spdk_bdev_module_list_find(const char *name)
{
struct spdk_bdev_module *bdev_module;
TAILQ_FOREACH(bdev_module, &g_bdev_mgr.bdev_modules, internal.tailq) {
if (strcmp(name, bdev_module->name) == 0) {
break;
}
}
return bdev_module;
}
static void
bdev_write_zero_buffer_next(void *_bdev_io)
{
struct spdk_bdev_io *bdev_io = _bdev_io;
uint64_t num_bytes, num_blocks;
void *md_buf = NULL;
int rc;
num_bytes = spdk_min(_bdev_get_block_size_with_md(bdev_io->bdev) *
bdev_io->u.bdev.split_remaining_num_blocks,
ZERO_BUFFER_SIZE);
num_blocks = num_bytes / _bdev_get_block_size_with_md(bdev_io->bdev);
if (spdk_bdev_is_md_separate(bdev_io->bdev)) {
md_buf = (char *)g_bdev_mgr.zero_buffer +
spdk_bdev_get_block_size(bdev_io->bdev) * num_blocks;
}
rc = bdev_write_blocks_with_md(bdev_io->internal.desc,
spdk_io_channel_from_ctx(bdev_io->internal.ch),
g_bdev_mgr.zero_buffer, md_buf,
bdev_io->u.bdev.split_current_offset_blocks, num_blocks,
bdev_write_zero_buffer_done, bdev_io);
if (rc == 0) {
bdev_io->u.bdev.split_remaining_num_blocks -= num_blocks;
bdev_io->u.bdev.split_current_offset_blocks += num_blocks;
} else if (rc == -ENOMEM) {
bdev_queue_io_wait_with_cb(bdev_io, bdev_write_zero_buffer_next);
} else {
bdev_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
bdev_io->internal.cb(bdev_io, false, bdev_io->internal.caller_ctx);
}
}
static void
bdev_write_zero_buffer_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
struct spdk_bdev_io *parent_io = cb_arg;
spdk_bdev_free_io(bdev_io);
if (!success) {
parent_io->internal.status = SPDK_BDEV_IO_STATUS_FAILED;
parent_io->internal.cb(parent_io, false, parent_io->internal.caller_ctx);
return;
}
if (parent_io->u.bdev.split_remaining_num_blocks == 0) {
parent_io->internal.status = SPDK_BDEV_IO_STATUS_SUCCESS;
parent_io->internal.cb(parent_io, true, parent_io->internal.caller_ctx);
return;
}
bdev_write_zero_buffer_next(parent_io);
}
static void
bdev_set_qos_limit_done(struct set_qos_limit_ctx *ctx, int status)
{
pthread_mutex_lock(&ctx->bdev->internal.mutex);
ctx->bdev->internal.qos_mod_in_progress = false;
pthread_mutex_unlock(&ctx->bdev->internal.mutex);
if (ctx->cb_fn) {
ctx->cb_fn(ctx->cb_arg, status);
}
free(ctx);
}
static void
bdev_disable_qos_done(void *cb_arg)
{
struct set_qos_limit_ctx *ctx = cb_arg;
struct spdk_bdev *bdev = ctx->bdev;
struct spdk_bdev_io *bdev_io;
struct spdk_bdev_qos *qos;
pthread_mutex_lock(&bdev->internal.mutex);
qos = bdev->internal.qos;
bdev->internal.qos = NULL;
pthread_mutex_unlock(&bdev->internal.mutex);
while (!TAILQ_EMPTY(&qos->queued)) {
/* Send queued I/O back to their original thread for resubmission. */
bdev_io = TAILQ_FIRST(&qos->queued);
TAILQ_REMOVE(&qos->queued, bdev_io, internal.link);
if (bdev_io->internal.io_submit_ch) {
/*
* Channel was changed when sending it to the QoS thread - change it back
* before sending it back to the original thread.
*/
bdev_io->internal.ch = bdev_io->internal.io_submit_ch;
bdev_io->internal.io_submit_ch = NULL;
}
spdk_thread_send_msg(spdk_bdev_io_get_thread(bdev_io),
_bdev_io_submit, bdev_io);
}
if (qos->thread != NULL) {
spdk_put_io_channel(spdk_io_channel_from_ctx(qos->ch));
spdk_poller_unregister(&qos->poller);
}
free(qos);
bdev_set_qos_limit_done(ctx, 0);
}
static void
bdev_disable_qos_msg_done(struct spdk_io_channel_iter *i, int status)
{
void *io_device = spdk_io_channel_iter_get_io_device(i);
struct spdk_bdev *bdev = __bdev_from_io_dev(io_device);
struct set_qos_limit_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct spdk_thread *thread;
pthread_mutex_lock(&bdev->internal.mutex);
thread = bdev->internal.qos->thread;
pthread_mutex_unlock(&bdev->internal.mutex);
if (thread != NULL) {
spdk_thread_send_msg(thread, bdev_disable_qos_done, ctx);
} else {
bdev_disable_qos_done(ctx);
}
}
static void
bdev_disable_qos_msg(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *bdev_ch = spdk_io_channel_get_ctx(ch);
bdev_ch->flags &= ~BDEV_CH_QOS_ENABLED;
spdk_for_each_channel_continue(i, 0);
}
static void
bdev_update_qos_rate_limit_msg(void *cb_arg)
{
struct set_qos_limit_ctx *ctx = cb_arg;
struct spdk_bdev *bdev = ctx->bdev;
pthread_mutex_lock(&bdev->internal.mutex);
bdev_qos_update_max_quota_per_timeslice(bdev->internal.qos);
pthread_mutex_unlock(&bdev->internal.mutex);
bdev_set_qos_limit_done(ctx, 0);
}
static void
bdev_enable_qos_msg(struct spdk_io_channel_iter *i)
{
void *io_device = spdk_io_channel_iter_get_io_device(i);
struct spdk_bdev *bdev = __bdev_from_io_dev(io_device);
struct spdk_io_channel *ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *bdev_ch = spdk_io_channel_get_ctx(ch);
pthread_mutex_lock(&bdev->internal.mutex);
bdev_enable_qos(bdev, bdev_ch);
pthread_mutex_unlock(&bdev->internal.mutex);
spdk_for_each_channel_continue(i, 0);
}
static void
bdev_enable_qos_done(struct spdk_io_channel_iter *i, int status)
{
struct set_qos_limit_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
bdev_set_qos_limit_done(ctx, status);
}
static void
bdev_set_qos_rate_limits(struct spdk_bdev *bdev, uint64_t *limits)
{
int i;
assert(bdev->internal.qos != NULL);
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (limits[i] != SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
bdev->internal.qos->rate_limits[i].limit = limits[i];
if (limits[i] == 0) {
bdev->internal.qos->rate_limits[i].limit =
SPDK_BDEV_QOS_LIMIT_NOT_DEFINED;
}
}
}
}
void
spdk_bdev_set_qos_rate_limits(struct spdk_bdev *bdev, uint64_t *limits,
void (*cb_fn)(void *cb_arg, int status), void *cb_arg)
{
struct set_qos_limit_ctx *ctx;
uint32_t limit_set_complement;
uint64_t min_limit_per_sec;
int i;
bool disable_rate_limit = true;
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (limits[i] == SPDK_BDEV_QOS_LIMIT_NOT_DEFINED) {
continue;
}
if (limits[i] > 0) {
disable_rate_limit = false;
}
if (bdev_qos_is_iops_rate_limit(i) == true) {
min_limit_per_sec = SPDK_BDEV_QOS_MIN_IOS_PER_SEC;
} else {
/* Change from megabyte to byte rate limit */
limits[i] = limits[i] * 1024 * 1024;
min_limit_per_sec = SPDK_BDEV_QOS_MIN_BYTES_PER_SEC;
}
limit_set_complement = limits[i] % min_limit_per_sec;
if (limit_set_complement) {
SPDK_ERRLOG("Requested rate limit %" PRIu64 " is not a multiple of %" PRIu64 "\n",
limits[i], min_limit_per_sec);
limits[i] += min_limit_per_sec - limit_set_complement;
SPDK_ERRLOG("Round up the rate limit to %" PRIu64 "\n", limits[i]);
}
}
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
cb_fn(cb_arg, -ENOMEM);
return;
}
ctx->cb_fn = cb_fn;
ctx->cb_arg = cb_arg;
ctx->bdev = bdev;
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev->internal.qos_mod_in_progress) {
pthread_mutex_unlock(&bdev->internal.mutex);
free(ctx);
cb_fn(cb_arg, -EAGAIN);
return;
}
bdev->internal.qos_mod_in_progress = true;
if (disable_rate_limit == true && bdev->internal.qos) {
for (i = 0; i < SPDK_BDEV_QOS_NUM_RATE_LIMIT_TYPES; i++) {
if (limits[i] == SPDK_BDEV_QOS_LIMIT_NOT_DEFINED &&
(bdev->internal.qos->rate_limits[i].limit > 0 &&
bdev->internal.qos->rate_limits[i].limit !=
SPDK_BDEV_QOS_LIMIT_NOT_DEFINED)) {
disable_rate_limit = false;
break;
}
}
}
if (disable_rate_limit == false) {
if (bdev->internal.qos == NULL) {
bdev->internal.qos = calloc(1, sizeof(*bdev->internal.qos));
if (!bdev->internal.qos) {
pthread_mutex_unlock(&bdev->internal.mutex);
SPDK_ERRLOG("Unable to allocate memory for QoS tracking\n");
bdev_set_qos_limit_done(ctx, -ENOMEM);
return;
}
}
if (bdev->internal.qos->thread == NULL) {
/* Enabling */
bdev_set_qos_rate_limits(bdev, limits);
spdk_for_each_channel(__bdev_to_io_dev(bdev),
bdev_enable_qos_msg, ctx,
bdev_enable_qos_done);
} else {
/* Updating */
bdev_set_qos_rate_limits(bdev, limits);
spdk_thread_send_msg(bdev->internal.qos->thread,
bdev_update_qos_rate_limit_msg, ctx);
}
} else {
if (bdev->internal.qos != NULL) {
bdev_set_qos_rate_limits(bdev, limits);
/* Disabling */
spdk_for_each_channel(__bdev_to_io_dev(bdev),
bdev_disable_qos_msg, ctx,
bdev_disable_qos_msg_done);
} else {
pthread_mutex_unlock(&bdev->internal.mutex);
bdev_set_qos_limit_done(ctx, 0);
return;
}
}
pthread_mutex_unlock(&bdev->internal.mutex);
}
struct spdk_bdev_histogram_ctx {
spdk_bdev_histogram_status_cb cb_fn;
void *cb_arg;
struct spdk_bdev *bdev;
int status;
};
static void
bdev_histogram_disable_channel_cb(struct spdk_io_channel_iter *i, int status)
{
struct spdk_bdev_histogram_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
pthread_mutex_lock(&ctx->bdev->internal.mutex);
ctx->bdev->internal.histogram_in_progress = false;
pthread_mutex_unlock(&ctx->bdev->internal.mutex);
ctx->cb_fn(ctx->cb_arg, ctx->status);
free(ctx);
}
static void
bdev_histogram_disable_channel(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
if (ch->histogram != NULL) {
spdk_histogram_data_free(ch->histogram);
ch->histogram = NULL;
}
spdk_for_each_channel_continue(i, 0);
}
static void
bdev_histogram_enable_channel_cb(struct spdk_io_channel_iter *i, int status)
{
struct spdk_bdev_histogram_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
if (status != 0) {
ctx->status = status;
ctx->bdev->internal.histogram_enabled = false;
spdk_for_each_channel(__bdev_to_io_dev(ctx->bdev), bdev_histogram_disable_channel, ctx,
bdev_histogram_disable_channel_cb);
} else {
pthread_mutex_lock(&ctx->bdev->internal.mutex);
ctx->bdev->internal.histogram_in_progress = false;
pthread_mutex_unlock(&ctx->bdev->internal.mutex);
ctx->cb_fn(ctx->cb_arg, ctx->status);
free(ctx);
}
}
static void
bdev_histogram_enable_channel(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
int status = 0;
if (ch->histogram == NULL) {
ch->histogram = spdk_histogram_data_alloc();
if (ch->histogram == NULL) {
status = -ENOMEM;
}
}
spdk_for_each_channel_continue(i, status);
}
void
spdk_bdev_histogram_enable(struct spdk_bdev *bdev, spdk_bdev_histogram_status_cb cb_fn,
void *cb_arg, bool enable)
{
struct spdk_bdev_histogram_ctx *ctx;
ctx = calloc(1, sizeof(struct spdk_bdev_histogram_ctx));
if (ctx == NULL) {
cb_fn(cb_arg, -ENOMEM);
return;
}
ctx->bdev = bdev;
ctx->status = 0;
ctx->cb_fn = cb_fn;
ctx->cb_arg = cb_arg;
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev->internal.histogram_in_progress) {
pthread_mutex_unlock(&bdev->internal.mutex);
free(ctx);
cb_fn(cb_arg, -EAGAIN);
return;
}
bdev->internal.histogram_in_progress = true;
pthread_mutex_unlock(&bdev->internal.mutex);
bdev->internal.histogram_enabled = enable;
if (enable) {
/* Allocate histogram for each channel */
spdk_for_each_channel(__bdev_to_io_dev(bdev), bdev_histogram_enable_channel, ctx,
bdev_histogram_enable_channel_cb);
} else {
spdk_for_each_channel(__bdev_to_io_dev(bdev), bdev_histogram_disable_channel, ctx,
bdev_histogram_disable_channel_cb);
}
}
struct spdk_bdev_histogram_data_ctx {
spdk_bdev_histogram_data_cb cb_fn;
void *cb_arg;
struct spdk_bdev *bdev;
/** merged histogram data from all channels */
struct spdk_histogram_data *histogram;
};
static void
bdev_histogram_get_channel_cb(struct spdk_io_channel_iter *i, int status)
{
struct spdk_bdev_histogram_data_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
ctx->cb_fn(ctx->cb_arg, status, ctx->histogram);
free(ctx);
}
static void
bdev_histogram_get_channel(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct spdk_bdev_histogram_data_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
int status = 0;
if (ch->histogram == NULL) {
status = -EFAULT;
} else {
spdk_histogram_data_merge(ctx->histogram, ch->histogram);
}
spdk_for_each_channel_continue(i, status);
}
void
spdk_bdev_histogram_get(struct spdk_bdev *bdev, struct spdk_histogram_data *histogram,
spdk_bdev_histogram_data_cb cb_fn,
void *cb_arg)
{
struct spdk_bdev_histogram_data_ctx *ctx;
ctx = calloc(1, sizeof(struct spdk_bdev_histogram_data_ctx));
if (ctx == NULL) {
cb_fn(cb_arg, -ENOMEM, NULL);
return;
}
ctx->bdev = bdev;
ctx->cb_fn = cb_fn;
ctx->cb_arg = cb_arg;
ctx->histogram = histogram;
spdk_for_each_channel(__bdev_to_io_dev(bdev), bdev_histogram_get_channel, ctx,
bdev_histogram_get_channel_cb);
}
size_t
spdk_bdev_get_media_events(struct spdk_bdev_desc *desc, struct spdk_bdev_media_event *events,
size_t max_events)
{
struct media_event_entry *entry;
size_t num_events = 0;
for (; num_events < max_events; ++num_events) {
entry = TAILQ_FIRST(&desc->pending_media_events);
if (entry == NULL) {
break;
}
events[num_events] = entry->event;
TAILQ_REMOVE(&desc->pending_media_events, entry, tailq);
TAILQ_INSERT_TAIL(&desc->free_media_events, entry, tailq);
}
return num_events;
}
int
spdk_bdev_push_media_events(struct spdk_bdev *bdev, const struct spdk_bdev_media_event *events,
size_t num_events)
{
struct spdk_bdev_desc *desc;
struct media_event_entry *entry;
size_t event_id;
int rc = 0;
assert(bdev->media_events);
pthread_mutex_lock(&bdev->internal.mutex);
TAILQ_FOREACH(desc, &bdev->internal.open_descs, link) {
if (desc->write) {
break;
}
}
if (desc == NULL || desc->media_events_buffer == NULL) {
rc = -ENODEV;
goto out;
}
for (event_id = 0; event_id < num_events; ++event_id) {
entry = TAILQ_FIRST(&desc->free_media_events);
if (entry == NULL) {
break;
}
TAILQ_REMOVE(&desc->free_media_events, entry, tailq);
TAILQ_INSERT_TAIL(&desc->pending_media_events, entry, tailq);
entry->event = events[event_id];
}
rc = event_id;
out:
pthread_mutex_unlock(&bdev->internal.mutex);
return rc;
}
void
spdk_bdev_notify_media_management(struct spdk_bdev *bdev)
{
struct spdk_bdev_desc *desc;
pthread_mutex_lock(&bdev->internal.mutex);
TAILQ_FOREACH(desc, &bdev->internal.open_descs, link) {
if (!TAILQ_EMPTY(&desc->pending_media_events)) {
desc->callback.event_fn(SPDK_BDEV_EVENT_MEDIA_MANAGEMENT, bdev,
desc->callback.ctx);
}
}
pthread_mutex_unlock(&bdev->internal.mutex);
}
struct locked_lba_range_ctx {
struct lba_range range;
struct spdk_bdev *bdev;
struct lba_range *current_range;
struct lba_range *owner_range;
struct spdk_poller *poller;
lock_range_cb cb_fn;
void *cb_arg;
};
static void
bdev_lock_error_cleanup_cb(struct spdk_io_channel_iter *i, int status)
{
struct locked_lba_range_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
ctx->cb_fn(ctx->cb_arg, -ENOMEM);
free(ctx);
}
static void
bdev_unlock_lba_range_get_channel(struct spdk_io_channel_iter *i);
static void
bdev_lock_lba_range_cb(struct spdk_io_channel_iter *i, int status)
{
struct locked_lba_range_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct spdk_bdev *bdev = ctx->bdev;
if (status == -ENOMEM) {
/* One of the channels could not allocate a range object.
* So we have to go back and clean up any ranges that were
* allocated successfully before we return error status to
* the caller. We can reuse the unlock function to do that
* clean up.
*/
spdk_for_each_channel(__bdev_to_io_dev(bdev),
bdev_unlock_lba_range_get_channel, ctx,
bdev_lock_error_cleanup_cb);
return;
}
/* All channels have locked this range and no I/O overlapping the range
* are outstanding! Set the owner_ch for the range object for the
* locking channel, so that this channel will know that it is allowed
* to write to this range.
*/
ctx->owner_range->owner_ch = ctx->range.owner_ch;
ctx->cb_fn(ctx->cb_arg, status);
/* Don't free the ctx here. Its range is in the bdev's global list of
* locked ranges still, and will be removed and freed when this range
* is later unlocked.
*/
}
static int
bdev_lock_lba_range_check_io(void *_i)
{
struct spdk_io_channel_iter *i = _i;
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct locked_lba_range_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct lba_range *range = ctx->current_range;
struct spdk_bdev_io *bdev_io;
spdk_poller_unregister(&ctx->poller);
/* The range is now in the locked_ranges, so no new IO can be submitted to this
* range. But we need to wait until any outstanding IO overlapping with this range
* are completed.
*/
TAILQ_FOREACH(bdev_io, &ch->io_submitted, internal.ch_link) {
if (bdev_io_range_is_locked(bdev_io, range)) {
ctx->poller = SPDK_POLLER_REGISTER(bdev_lock_lba_range_check_io, i, 100);
return 1;
}
}
spdk_for_each_channel_continue(i, 0);
return 1;
}
static void
bdev_lock_lba_range_get_channel(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct locked_lba_range_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct lba_range *range;
TAILQ_FOREACH(range, &ch->locked_ranges, tailq) {
if (range->length == ctx->range.length &&
range->offset == ctx->range.offset &&
range->locked_ctx == ctx->range.locked_ctx) {
/* This range already exists on this channel, so don't add
* it again. This can happen when a new channel is created
* while the for_each_channel operation is in progress.
* Do not check for outstanding I/O in that case, since the
* range was locked before any I/O could be submitted to the
* new channel.
*/
spdk_for_each_channel_continue(i, 0);
return;
}
}
range = calloc(1, sizeof(*range));
if (range == NULL) {
spdk_for_each_channel_continue(i, -ENOMEM);
return;
}
range->length = ctx->range.length;
range->offset = ctx->range.offset;
range->locked_ctx = ctx->range.locked_ctx;
ctx->current_range = range;
if (ctx->range.owner_ch == ch) {
/* This is the range object for the channel that will hold
* the lock. Store it in the ctx object so that we can easily
* set its owner_ch after the lock is finally acquired.
*/
ctx->owner_range = range;
}
TAILQ_INSERT_TAIL(&ch->locked_ranges, range, tailq);
bdev_lock_lba_range_check_io(i);
}
static void
bdev_lock_lba_range_ctx(struct spdk_bdev *bdev, struct locked_lba_range_ctx *ctx)
{
assert(spdk_get_thread() == ctx->range.owner_ch->channel->thread);
/* We will add a copy of this range to each channel now. */
spdk_for_each_channel(__bdev_to_io_dev(bdev), bdev_lock_lba_range_get_channel, ctx,
bdev_lock_lba_range_cb);
}
static bool
bdev_lba_range_overlaps_tailq(struct lba_range *range, lba_range_tailq_t *tailq)
{
struct lba_range *r;
TAILQ_FOREACH(r, tailq, tailq) {
if (bdev_lba_range_overlapped(range, r)) {
return true;
}
}
return false;
}
static int
bdev_lock_lba_range(struct spdk_bdev_desc *desc, struct spdk_io_channel *_ch,
uint64_t offset, uint64_t length,
lock_range_cb cb_fn, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct locked_lba_range_ctx *ctx;
if (cb_arg == NULL) {
SPDK_ERRLOG("cb_arg must not be NULL\n");
return -EINVAL;
}
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
return -ENOMEM;
}
ctx->range.offset = offset;
ctx->range.length = length;
ctx->range.owner_ch = ch;
ctx->range.locked_ctx = cb_arg;
ctx->bdev = bdev;
ctx->cb_fn = cb_fn;
ctx->cb_arg = cb_arg;
pthread_mutex_lock(&bdev->internal.mutex);
if (bdev_lba_range_overlaps_tailq(&ctx->range, &bdev->internal.locked_ranges)) {
/* There is an active lock overlapping with this range.
* Put it on the pending list until this range no
* longer overlaps with another.
*/
TAILQ_INSERT_TAIL(&bdev->internal.pending_locked_ranges, &ctx->range, tailq);
} else {
TAILQ_INSERT_TAIL(&bdev->internal.locked_ranges, &ctx->range, tailq);
bdev_lock_lba_range_ctx(bdev, ctx);
}
pthread_mutex_unlock(&bdev->internal.mutex);
return 0;
}
static void
bdev_lock_lba_range_ctx_msg(void *_ctx)
{
struct locked_lba_range_ctx *ctx = _ctx;
bdev_lock_lba_range_ctx(ctx->bdev, ctx);
}
static void
bdev_unlock_lba_range_cb(struct spdk_io_channel_iter *i, int status)
{
struct locked_lba_range_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
struct locked_lba_range_ctx *pending_ctx;
struct spdk_bdev_channel *ch = ctx->range.owner_ch;
struct spdk_bdev *bdev = ch->bdev;
struct lba_range *range, *tmp;
pthread_mutex_lock(&bdev->internal.mutex);
/* Check if there are any pending locked ranges that overlap with this range
* that was just unlocked. If there are, check that it doesn't overlap with any
* other locked ranges before calling bdev_lock_lba_range_ctx which will start
* the lock process.
*/
TAILQ_FOREACH_SAFE(range, &bdev->internal.pending_locked_ranges, tailq, tmp) {
if (bdev_lba_range_overlapped(range, &ctx->range) &&
!bdev_lba_range_overlaps_tailq(range, &bdev->internal.locked_ranges)) {
TAILQ_REMOVE(&bdev->internal.pending_locked_ranges, range, tailq);
pending_ctx = SPDK_CONTAINEROF(range, struct locked_lba_range_ctx, range);
TAILQ_INSERT_TAIL(&bdev->internal.locked_ranges, range, tailq);
spdk_thread_send_msg(pending_ctx->range.owner_ch->channel->thread,
bdev_lock_lba_range_ctx_msg, pending_ctx);
}
}
pthread_mutex_unlock(&bdev->internal.mutex);
ctx->cb_fn(ctx->cb_arg, status);
free(ctx);
}
static void
bdev_unlock_lba_range_get_channel(struct spdk_io_channel_iter *i)
{
struct spdk_io_channel *_ch = spdk_io_channel_iter_get_channel(i);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct locked_lba_range_ctx *ctx = spdk_io_channel_iter_get_ctx(i);
TAILQ_HEAD(, spdk_bdev_io) io_locked;
struct spdk_bdev_io *bdev_io;
struct lba_range *range;
TAILQ_FOREACH(range, &ch->locked_ranges, tailq) {
if (ctx->range.offset == range->offset &&
ctx->range.length == range->length &&
ctx->range.locked_ctx == range->locked_ctx) {
TAILQ_REMOVE(&ch->locked_ranges, range, tailq);
free(range);
break;
}
}
/* Note: we should almost always be able to assert that the range specified
* was found. But there are some very rare corner cases where a new channel
* gets created simultaneously with a range unlock, where this function
* would execute on that new channel and wouldn't have the range.
* We also use this to clean up range allocations when a later allocation
* fails in the locking path.
* So we can't actually assert() here.
*/
/* Swap the locked IO into a temporary list, and then try to submit them again.
* We could hyper-optimize this to only resubmit locked I/O that overlap
* with the range that was just unlocked, but this isn't a performance path so
* we go for simplicity here.
*/
TAILQ_INIT(&io_locked);
TAILQ_SWAP(&ch->io_locked, &io_locked, spdk_bdev_io, internal.ch_link);
while (!TAILQ_EMPTY(&io_locked)) {
bdev_io = TAILQ_FIRST(&io_locked);
TAILQ_REMOVE(&io_locked, bdev_io, internal.ch_link);
bdev_io_submit(bdev_io);
}
spdk_for_each_channel_continue(i, 0);
}
static int
bdev_unlock_lba_range(struct spdk_bdev_desc *desc, struct spdk_io_channel *_ch,
uint64_t offset, uint64_t length,
lock_range_cb cb_fn, void *cb_arg)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(desc);
struct spdk_bdev_channel *ch = spdk_io_channel_get_ctx(_ch);
struct locked_lba_range_ctx *ctx;
struct lba_range *range;
bool range_found = false;
/* Let's make sure the specified channel actually has a lock on
* the specified range. Note that the range must match exactly.
*/
TAILQ_FOREACH(range, &ch->locked_ranges, tailq) {
if (range->offset == offset && range->length == length &&
range->owner_ch == ch && range->locked_ctx == cb_arg) {
range_found = true;
break;
}
}
if (!range_found) {
return -EINVAL;
}
pthread_mutex_lock(&bdev->internal.mutex);
/* We confirmed that this channel has locked the specified range. To
* start the unlock the process, we find the range in the bdev's locked_ranges
* and remove it. This ensures new channels don't inherit the locked range.
* Then we will send a message to each channel (including the one specified
* here) to remove the range from its per-channel list.
*/
TAILQ_FOREACH(range, &bdev->internal.locked_ranges, tailq) {
if (range->offset == offset && range->length == length &&
range->locked_ctx == cb_arg) {
break;
}
}
if (range == NULL) {
assert(false);
pthread_mutex_unlock(&bdev->internal.mutex);
return -EINVAL;
}
TAILQ_REMOVE(&bdev->internal.locked_ranges, range, tailq);
ctx = SPDK_CONTAINEROF(range, struct locked_lba_range_ctx, range);
pthread_mutex_unlock(&bdev->internal.mutex);
ctx->cb_fn = cb_fn;
ctx->cb_arg = cb_arg;
spdk_for_each_channel(__bdev_to_io_dev(bdev), bdev_unlock_lba_range_get_channel, ctx,
bdev_unlock_lba_range_cb);
return 0;
}
SPDK_LOG_REGISTER_COMPONENT("bdev", SPDK_LOG_BDEV)
SPDK_TRACE_REGISTER_FN(bdev_trace, "bdev", TRACE_GROUP_BDEV)
{
spdk_trace_register_owner(OWNER_BDEV, 'b');
spdk_trace_register_object(OBJECT_BDEV_IO, 'i');
spdk_trace_register_description("BDEV_IO_START", TRACE_BDEV_IO_START, OWNER_BDEV,
OBJECT_BDEV_IO, 1, 0, "type: ");
spdk_trace_register_description("BDEV_IO_DONE", TRACE_BDEV_IO_DONE, OWNER_BDEV,
OBJECT_BDEV_IO, 0, 0, "");
}
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