freebsd-nq/include/sys/dsl_dir.h
Matthew Ahrens a1d477c24c OpenZFS 7614, 9064 - zfs device evacuation/removal
OpenZFS 7614 - zfs device evacuation/removal
OpenZFS 9064 - remove_mirror should wait for device removal to complete

This project allows top-level vdevs to be removed from the storage pool
with "zpool remove", reducing the total amount of storage in the pool.
This operation copies all allocated regions of the device to be removed
onto other devices, recording the mapping from old to new location.
After the removal is complete, read and free operations to the removed
(now "indirect") vdev must be remapped and performed at the new location
on disk.  The indirect mapping table is kept in memory whenever the pool
is loaded, so there is minimal performance overhead when doing operations
on the indirect vdev.

The size of the in-memory mapping table will be reduced when its entries
become "obsolete" because they are no longer used by any block pointers
in the pool.  An entry becomes obsolete when all the blocks that use
it are freed.  An entry can also become obsolete when all the snapshots
that reference it are deleted, and the block pointers that reference it
have been "remapped" in all filesystems/zvols (and clones).  Whenever an
indirect block is written, all the block pointers in it will be "remapped"
to their new (concrete) locations if possible.  This process can be
accelerated by using the "zfs remap" command to proactively rewrite all
indirect blocks that reference indirect (removed) vdevs.

Note that when a device is removed, we do not verify the checksum of
the data that is copied.  This makes the process much faster, but if it
were used on redundant vdevs (i.e. mirror or raidz vdevs), it would be
possible to copy the wrong data, when we have the correct data on e.g.
the other side of the mirror.

At the moment, only mirrors and simple top-level vdevs can be removed
and no removal is allowed if any of the top-level vdevs are raidz.

Porting Notes:

* Avoid zero-sized kmem_alloc() in vdev_compact_children().

    The device evacuation code adds a dependency that
    vdev_compact_children() be able to properly empty the vdev_child
    array by setting it to NULL and zeroing vdev_children.  Under Linux,
    kmem_alloc() and related functions return a sentinel pointer rather
    than NULL for zero-sized allocations.

* Remove comment regarding "mpt" driver where zfs_remove_max_segment
  is initialized to SPA_MAXBLOCKSIZE.

  Change zfs_condense_indirect_commit_entry_delay_ticks to
  zfs_condense_indirect_commit_entry_delay_ms for consistency with
  most other tunables in which delays are specified in ms.

* ZTS changes:

    Use set_tunable rather than mdb
    Use zpool sync as appropriate
    Use sync_pool instead of sync
    Kill jobs during test_removal_with_operation to allow unmount/export
    Don't add non-disk names such as "mirror" or "raidz" to $DISKS
    Use $TEST_BASE_DIR instead of /tmp
    Increase HZ from 100 to 1000 which is more common on Linux

    removal_multiple_indirection.ksh
        Reduce iterations in order to not time out on the code
        coverage builders.

    removal_resume_export:
        Functionally, the test case is correct but there exists a race
        where the kernel thread hasn't been fully started yet and is
        not visible.  Wait for up to 1 second for the removal thread
        to be started before giving up on it.  Also, increase the
        amount of data copied in order that the removal not finish
        before the export has a chance to fail.

* MMP compatibility, the concept of concrete versus non-concrete devices
  has slightly changed the semantics of vdev_writeable().  Update
  mmp_random_leaf_impl() accordingly.

* Updated dbuf_remap() to handle the org.zfsonlinux:large_dnode pool
  feature which is not supported by OpenZFS.

* Added support for new vdev removal tracepoints.

* Test cases removal_with_zdb and removal_condense_export have been
  intentionally disabled.  When run manually they pass as intended,
  but when running in the automated test environment they produce
  unreliable results on the latest Fedora release.

  They may work better once the upstream pool import refectoring is
  merged into ZoL at which point they will be re-enabled.

Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Alex Reece <alex@delphix.com>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Richard Laager <rlaager@wiktel.com>
Reviewed by: Tim Chase <tim@chase2k.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Garrett D'Amore <garrett@damore.org>
Ported-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Tim Chase <tim@chase2k.com>

OpenZFS-issue: https://www.illumos.org/issues/7614
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/f539f1eb
Closes #6900
2018-04-14 12:16:17 -07:00

213 lines
7.2 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
* Copyright (c) 2014, Joyent, Inc. All rights reserved.
* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
*/
#ifndef _SYS_DSL_DIR_H
#define _SYS_DSL_DIR_H
#include <sys/dmu.h>
#include <sys/dsl_pool.h>
#include <sys/dsl_synctask.h>
#include <sys/refcount.h>
#include <sys/zfs_context.h>
#include <sys/dsl_crypt.h>
#ifdef __cplusplus
extern "C" {
#endif
struct dsl_dataset;
/*
* DD_FIELD_* are strings that are used in the "extensified" dsl_dir zap object.
* They should be of the format <reverse-dns>:<field>.
*/
#define DD_FIELD_FILESYSTEM_COUNT "com.joyent:filesystem_count"
#define DD_FIELD_SNAPSHOT_COUNT "com.joyent:snapshot_count"
#define DD_FIELD_LAST_REMAP_TXG "com.delphix:last_remap_txg"
#define DD_FIELD_CRYPTO_KEY_OBJ "com.datto:crypto_key_obj"
#define DD_FIELD_LAST_REMAP_TXG "com.delphix:last_remap_txg"
typedef enum dd_used {
DD_USED_HEAD,
DD_USED_SNAP,
DD_USED_CHILD,
DD_USED_CHILD_RSRV,
DD_USED_REFRSRV,
DD_USED_NUM
} dd_used_t;
#define DD_FLAG_USED_BREAKDOWN (1<<0)
typedef struct dsl_dir_phys {
uint64_t dd_creation_time; /* not actually used */
uint64_t dd_head_dataset_obj;
uint64_t dd_parent_obj;
uint64_t dd_origin_obj;
uint64_t dd_child_dir_zapobj;
/*
* how much space our children are accounting for; for leaf
* datasets, == physical space used by fs + snaps
*/
uint64_t dd_used_bytes;
uint64_t dd_compressed_bytes;
uint64_t dd_uncompressed_bytes;
/* Administrative quota setting */
uint64_t dd_quota;
/* Administrative reservation setting */
uint64_t dd_reserved;
uint64_t dd_props_zapobj;
uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
uint64_t dd_flags;
uint64_t dd_used_breakdown[DD_USED_NUM];
uint64_t dd_clones; /* dsl_dir objects */
uint64_t dd_pad[13]; /* pad out to 256 bytes for good measure */
} dsl_dir_phys_t;
struct dsl_dir {
dmu_buf_user_t dd_dbu;
/* These are immutable; no lock needed: */
uint64_t dd_object;
uint64_t dd_crypto_obj;
dsl_pool_t *dd_pool;
/* Stable until user eviction; no lock needed: */
dmu_buf_t *dd_dbuf;
/* protected by lock on pool's dp_dirty_dirs list */
txg_node_t dd_dirty_link;
/* protected by dp_config_rwlock */
dsl_dir_t *dd_parent;
/* Protected by dd_lock */
kmutex_t dd_lock;
list_t dd_props; /* list of dsl_prop_record_t's */
timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
uint64_t dd_origin_txg;
/* gross estimate of space used by in-flight tx's */
uint64_t dd_tempreserved[TXG_SIZE];
/* amount of space we expect to write; == amount of dirty data */
int64_t dd_space_towrite[TXG_SIZE];
/* protected by dd_lock; keep at end of struct for better locality */
char dd_myname[ZFS_MAX_DATASET_NAME_LEN];
};
static inline dsl_dir_phys_t *
dsl_dir_phys(dsl_dir_t *dd)
{
return (dd->dd_dbuf->db_data);
}
void dsl_dir_rele(dsl_dir_t *dd, void *tag);
void dsl_dir_async_rele(dsl_dir_t *dd, void *tag);
int dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag,
dsl_dir_t **, const char **tail);
int dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
const char *tail, void *tag, dsl_dir_t **);
void dsl_dir_name(dsl_dir_t *dd, char *buf);
int dsl_dir_namelen(dsl_dir_t *dd);
uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds,
const char *name, dmu_tx_t *tx);
uint64_t dsl_dir_get_used(dsl_dir_t *dd);
uint64_t dsl_dir_get_quota(dsl_dir_t *dd);
uint64_t dsl_dir_get_reservation(dsl_dir_t *dd);
uint64_t dsl_dir_get_compressratio(dsl_dir_t *dd);
uint64_t dsl_dir_get_logicalused(dsl_dir_t *dd);
uint64_t dsl_dir_get_usedsnap(dsl_dir_t *dd);
uint64_t dsl_dir_get_usedds(dsl_dir_t *dd);
uint64_t dsl_dir_get_usedrefreserv(dsl_dir_t *dd);
uint64_t dsl_dir_get_usedchild(dsl_dir_t *dd);
void dsl_dir_get_origin(dsl_dir_t *dd, char *buf);
int dsl_dir_get_filesystem_count(dsl_dir_t *dd, uint64_t *count);
int dsl_dir_get_snapshot_count(dsl_dir_t *dd, uint64_t *count);
void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv);
uint64_t dsl_dir_space_available(dsl_dir_t *dd,
dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx);
int dsl_dir_get_remaptxg(dsl_dir_t *dd, uint64_t *count);
void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx);
int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
uint64_t asize, boolean_t netfree, void **tr_cookiep, dmu_tx_t *tx);
void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx);
void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx);
void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
uint64_t quota);
int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
uint64_t reservation);
int dsl_dir_activate_fs_ss_limit(const char *);
int dsl_fs_ss_limit_check(dsl_dir_t *, uint64_t, zfs_prop_t, dsl_dir_t *,
cred_t *);
void dsl_fs_ss_count_adjust(dsl_dir_t *, int64_t, const char *, dmu_tx_t *);
int dsl_dir_update_last_remap_txg(dsl_dir_t *, uint64_t);
int dsl_dir_rename(const char *oldname, const char *newname);
int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *);
boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
dmu_tx_t *tx);
void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);
boolean_t dsl_dir_is_zapified(dsl_dir_t *dd);
/* internal reserved dir name */
#define MOS_DIR_NAME "$MOS"
#define ORIGIN_DIR_NAME "$ORIGIN"
#define FREE_DIR_NAME "$FREE"
#define LEAK_DIR_NAME "$LEAK"
#ifdef ZFS_DEBUG
#define dprintf_dd(dd, fmt, ...) do { \
if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
dsl_dir_name(dd, __ds_name); \
dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
} \
_NOTE(CONSTCOND) } while (0)
#else
#define dprintf_dd(dd, fmt, ...)
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_DSL_DIR_H */