freebsd-dev/sys/fs/nandfs/nandfs_vfsops.c
Grzegorz Bernacki 7f725bcd5c Import work done under project/nand (@235533) into head.
The NAND Flash environment consists of several distinct components:
  - NAND framework (drivers harness for NAND controllers and NAND chips)
  - NAND simulator (NANDsim)
  - NAND file system (NAND FS)
  - Companion tools and utilities
  - Documentation (manual pages)

This work is still experimental. Please use with caution.

Obtained from: Semihalf
Supported by:  FreeBSD Foundation, Juniper Networks
2012-05-17 10:11:18 +00:00

1591 lines
40 KiB
C

/*-
* Copyright (c) 2010-2012 Semihalf
* Copyright (c) 2008, 2009 Reinoud Zandijk
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* From: NetBSD: nilfs_vfsops.c,v 1.1 2009/07/18 16:31:42 reinoud Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/priv.h>
#include <sys/vnode.h>
#include <sys/buf.h>
#include <sys/sysctl.h>
#include <sys/libkern.h>
#include <geom/geom.h>
#include <geom/geom_vfs.h>
#include <machine/_inttypes.h>
#include <fs/nandfs/nandfs_mount.h>
#include <fs/nandfs/nandfs.h>
#include <fs/nandfs/nandfs_subr.h>
static MALLOC_DEFINE(M_NANDFSMNT, "nandfs_mount", "NANDFS mount structure");
#define NANDFS_SET_SYSTEMFILE(vp) { \
(vp)->v_vflag |= VV_SYSTEM; \
vref(vp); \
vput(vp); }
#define NANDFS_UNSET_SYSTEMFILE(vp) { \
VOP_LOCK(vp, LK_EXCLUSIVE); \
MPASS(vp->v_bufobj.bo_dirty.bv_cnt == 0); \
(vp)->v_vflag &= ~VV_SYSTEM; \
vgone(vp); \
vput(vp); }
/* Globals */
struct _nandfs_devices nandfs_devices;
/* Parameters */
int nandfs_verbose = 0;
static void
nandfs_tunable_init(void *arg)
{
TUNABLE_INT_FETCH("vfs.nandfs.verbose", &nandfs_verbose);
}
SYSINIT(nandfs_tunables, SI_SUB_VFS, SI_ORDER_ANY, nandfs_tunable_init, NULL);
static SYSCTL_NODE(_vfs, OID_AUTO, nandfs, CTLFLAG_RD, 0, "NAND filesystem");
static SYSCTL_NODE(_vfs_nandfs, OID_AUTO, mount, CTLFLAG_RD, 0,
"NANDFS mountpoints");
SYSCTL_INT(_vfs_nandfs, OID_AUTO, verbose, CTLFLAG_RW, &nandfs_verbose, 0, "");
#define NANDFS_CONSTR_INTERVAL 5
int nandfs_sync_interval = NANDFS_CONSTR_INTERVAL; /* sync every 5 seconds */
SYSCTL_UINT(_vfs_nandfs, OID_AUTO, sync_interval, CTLFLAG_RW,
&nandfs_sync_interval, 0, "");
#define NANDFS_MAX_DIRTY_SEGS 5
int nandfs_max_dirty_segs = NANDFS_MAX_DIRTY_SEGS; /* sync when 5 dirty seg */
SYSCTL_UINT(_vfs_nandfs, OID_AUTO, max_dirty_segs, CTLFLAG_RW,
&nandfs_max_dirty_segs, 0, "");
#define NANDFS_CPS_BETWEEN_SBLOCKS 5
int nandfs_cps_between_sblocks = NANDFS_CPS_BETWEEN_SBLOCKS; /* write superblock every 5 checkpoints */
SYSCTL_UINT(_vfs_nandfs, OID_AUTO, cps_between_sblocks, CTLFLAG_RW,
&nandfs_cps_between_sblocks, 0, "");
#define NANDFS_CLEANER_ENABLE 1
int nandfs_cleaner_enable = NANDFS_CLEANER_ENABLE;
SYSCTL_UINT(_vfs_nandfs, OID_AUTO, cleaner_enable, CTLFLAG_RW,
&nandfs_cleaner_enable, 0, "");
#define NANDFS_CLEANER_INTERVAL 5
int nandfs_cleaner_interval = NANDFS_CLEANER_INTERVAL;
SYSCTL_UINT(_vfs_nandfs, OID_AUTO, cleaner_interval, CTLFLAG_RW,
&nandfs_cleaner_interval, 0, "");
#define NANDFS_CLEANER_SEGMENTS 5
int nandfs_cleaner_segments = NANDFS_CLEANER_SEGMENTS;
SYSCTL_UINT(_vfs_nandfs, OID_AUTO, cleaner_segments, CTLFLAG_RW,
&nandfs_cleaner_segments, 0, "");
static int nandfs_mountfs(struct vnode *devvp, struct mount *mp);
static vfs_mount_t nandfs_mount;
static vfs_root_t nandfs_root;
static vfs_statfs_t nandfs_statfs;
static vfs_unmount_t nandfs_unmount;
static vfs_vget_t nandfs_vget;
static vfs_sync_t nandfs_sync;
static const char *nandfs_opts[] = {
"snap", "from", "noatime", NULL
};
/* System nodes */
static int
nandfs_create_system_nodes(struct nandfs_device *nandfsdev)
{
int error;
error = nandfs_get_node_raw(nandfsdev, NULL, NANDFS_DAT_INO,
&nandfsdev->nd_super_root.sr_dat, &nandfsdev->nd_dat_node);
if (error)
goto errorout;
error = nandfs_get_node_raw(nandfsdev, NULL, NANDFS_CPFILE_INO,
&nandfsdev->nd_super_root.sr_cpfile, &nandfsdev->nd_cp_node);
if (error)
goto errorout;
error = nandfs_get_node_raw(nandfsdev, NULL, NANDFS_SUFILE_INO,
&nandfsdev->nd_super_root.sr_sufile, &nandfsdev->nd_su_node);
if (error)
goto errorout;
error = nandfs_get_node_raw(nandfsdev, NULL, NANDFS_GC_INO,
NULL, &nandfsdev->nd_gc_node);
if (error)
goto errorout;
NANDFS_SET_SYSTEMFILE(NTOV(nandfsdev->nd_dat_node));
NANDFS_SET_SYSTEMFILE(NTOV(nandfsdev->nd_cp_node));
NANDFS_SET_SYSTEMFILE(NTOV(nandfsdev->nd_su_node));
NANDFS_SET_SYSTEMFILE(NTOV(nandfsdev->nd_gc_node));
DPRINTF(VOLUMES, ("System vnodes: dat: %p cp: %p su: %p\n",
NTOV(nandfsdev->nd_dat_node), NTOV(nandfsdev->nd_cp_node),
NTOV(nandfsdev->nd_su_node)));
return (0);
errorout:
nandfs_dispose_node(&nandfsdev->nd_gc_node);
nandfs_dispose_node(&nandfsdev->nd_dat_node);
nandfs_dispose_node(&nandfsdev->nd_cp_node);
nandfs_dispose_node(&nandfsdev->nd_su_node);
return (error);
}
static void
nandfs_release_system_nodes(struct nandfs_device *nandfsdev)
{
if (!nandfsdev)
return;
if (nandfsdev->nd_refcnt > 0)
return;
if (nandfsdev->nd_gc_node)
NANDFS_UNSET_SYSTEMFILE(NTOV(nandfsdev->nd_gc_node));
if (nandfsdev->nd_dat_node)
NANDFS_UNSET_SYSTEMFILE(NTOV(nandfsdev->nd_dat_node));
if (nandfsdev->nd_cp_node)
NANDFS_UNSET_SYSTEMFILE(NTOV(nandfsdev->nd_cp_node));
if (nandfsdev->nd_su_node)
NANDFS_UNSET_SYSTEMFILE(NTOV(nandfsdev->nd_su_node));
}
static int
nandfs_check_fsdata_crc(struct nandfs_fsdata *fsdata)
{
uint32_t fsdata_crc, comp_crc;
if (fsdata->f_magic != NANDFS_FSDATA_MAGIC)
return (0);
/* Preserve CRC */
fsdata_crc = fsdata->f_sum;
/* Calculate */
fsdata->f_sum = (0);
comp_crc = crc32((uint8_t *)fsdata, fsdata->f_bytes);
/* Restore */
fsdata->f_sum = fsdata_crc;
/* Check CRC */
return (fsdata_crc == comp_crc);
}
static int
nandfs_check_superblock_crc(struct nandfs_fsdata *fsdata,
struct nandfs_super_block *super)
{
uint32_t super_crc, comp_crc;
/* Check super block magic */
if (super->s_magic != NANDFS_SUPER_MAGIC)
return (0);
/* Preserve CRC */
super_crc = super->s_sum;
/* Calculate */
super->s_sum = (0);
comp_crc = crc32((uint8_t *)super, fsdata->f_sbbytes);
/* Restore */
super->s_sum = super_crc;
/* Check CRC */
return (super_crc == comp_crc);
}
static void
nandfs_calc_superblock_crc(struct nandfs_fsdata *fsdata,
struct nandfs_super_block *super)
{
uint32_t comp_crc;
/* Calculate */
super->s_sum = 0;
comp_crc = crc32((uint8_t *)super, fsdata->f_sbbytes);
/* Restore */
super->s_sum = comp_crc;
}
static int
nandfs_is_empty(u_char *area, int size)
{
int i;
for (i = 0; i < size; i++)
if (area[i] != 0xff)
return (0);
return (1);
}
static __inline int
nandfs_sblocks_in_esize(struct nandfs_device *fsdev)
{
return ((fsdev->nd_erasesize - NANDFS_SBLOCK_OFFSET_BYTES) /
sizeof(struct nandfs_super_block));
}
static __inline int
nandfs_max_sblocks(struct nandfs_device *fsdev)
{
return (NANDFS_NFSAREAS * nandfs_sblocks_in_esize(fsdev));
}
static __inline int
nandfs_sblocks_in_block(struct nandfs_device *fsdev)
{
return (fsdev->nd_devblocksize / sizeof(struct nandfs_super_block));
}
static __inline int
nandfs_sblocks_in_first_block(struct nandfs_device *fsdev)
{
int n;
n = nandfs_sblocks_in_block(fsdev) -
NANDFS_SBLOCK_OFFSET_BYTES / sizeof(struct nandfs_super_block);
if (n < 0)
n = 0;
return (n);
}
static int
nandfs_write_superblock_at(struct nandfs_device *fsdev,
struct nandfs_fsarea *fstp)
{
struct nandfs_super_block *super, *supert;
struct buf *bp;
int sb_per_sector, sbs_in_fsd, read_block;
int index, pos, error;
off_t offset;
DPRINTF(SYNC, ("%s: last_used %d nandfs_sblocks_in_esize %d\n",
__func__, fstp->last_used, nandfs_sblocks_in_esize(fsdev)));
if (fstp->last_used == nandfs_sblocks_in_esize(fsdev) - 1)
index = 0;
else
index = fstp->last_used + 1;
super = &fsdev->nd_super;
supert = NULL;
sb_per_sector = nandfs_sblocks_in_block(fsdev);
sbs_in_fsd = sizeof(struct nandfs_fsdata) /
sizeof(struct nandfs_super_block);
index += sbs_in_fsd;
offset = fstp->offset;
DPRINTF(SYNC, ("%s: offset %#jx s_last_pseg %#jx s_last_cno %#jx "
"s_last_seq %#jx wtime %jd index %d\n", __func__, offset,
super->s_last_pseg, super->s_last_cno, super->s_last_seq,
super->s_wtime, index));
read_block = btodb(offset + ((index / sb_per_sector) * sb_per_sector)
* sizeof(struct nandfs_super_block));
DPRINTF(SYNC, ("%s: read_block %#x\n", __func__, read_block));
if (index == sbs_in_fsd) {
error = nandfs_erase(fsdev, offset, fsdev->nd_erasesize);
if (error)
return (error);
error = bread(fsdev->nd_devvp, btodb(offset),
fsdev->nd_devblocksize, NOCRED, &bp);
if (error) {
printf("NANDFS: couldn't read initial data: %d\n",
error);
brelse(bp);
return (error);
}
memcpy(bp->b_data, &fsdev->nd_fsdata, sizeof(fsdev->nd_fsdata));
/*
* 0xff-out the rest. This bp could be cached, so potentially
* b_data contains stale super blocks.
*
* We don't mind cached bp since most of the time we just add
* super blocks to already 0xff-out b_data and don't need to
* perform actual read.
*/
if (fsdev->nd_devblocksize > sizeof(fsdev->nd_fsdata))
memset(bp->b_data + sizeof(fsdev->nd_fsdata), 0xff,
fsdev->nd_devblocksize - sizeof(fsdev->nd_fsdata));
error = bwrite(bp);
if (error) {
printf("NANDFS: cannot rewrite initial data at %jx\n",
offset);
return (error);
}
}
error = bread(fsdev->nd_devvp, read_block, fsdev->nd_devblocksize,
NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
supert = (struct nandfs_super_block *)(bp->b_data);
pos = index % sb_per_sector;
DPRINTF(SYNC, ("%s: storing at %d\n", __func__, pos));
memcpy(&supert[pos], super, sizeof(struct nandfs_super_block));
/*
* See comment above in code that performs erase.
*/
if (pos == 0)
memset(&supert[1], 0xff,
(sb_per_sector - 1) * sizeof(struct nandfs_super_block));
error = bwrite(bp);
if (error) {
printf("NANDFS: cannot update superblock at %jx\n", offset);
return (error);
}
DPRINTF(SYNC, ("%s: fstp->last_used %d -> %d\n", __func__,
fstp->last_used, index - sbs_in_fsd));
fstp->last_used = index - sbs_in_fsd;
return (0);
}
int
nandfs_write_superblock(struct nandfs_device *fsdev)
{
struct nandfs_super_block *super;
struct timespec ts;
int error;
int i, j;
vfs_timestamp(&ts);
super = &fsdev->nd_super;
super->s_last_pseg = fsdev->nd_last_pseg;
super->s_last_cno = fsdev->nd_last_cno;
super->s_last_seq = fsdev->nd_seg_sequence;
super->s_wtime = ts.tv_sec;
nandfs_calc_superblock_crc(&fsdev->nd_fsdata, super);
error = 0;
for (i = 0, j = fsdev->nd_last_fsarea; i < NANDFS_NFSAREAS;
i++, j = (j + 1 % NANDFS_NFSAREAS)) {
if (fsdev->nd_fsarea[j].flags & NANDFS_FSSTOR_FAILED) {
DPRINTF(SYNC, ("%s: skipping %d\n", __func__, j));
continue;
}
error = nandfs_write_superblock_at(fsdev, &fsdev->nd_fsarea[j]);
if (error) {
printf("NANDFS: writing superblock at offset %d failed:"
"%d\n", j * fsdev->nd_erasesize, error);
fsdev->nd_fsarea[j].flags |= NANDFS_FSSTOR_FAILED;
} else
break;
}
if (i == NANDFS_NFSAREAS) {
printf("NANDFS: superblock was not written\n");
/*
* TODO: switch to read-only?
*/
return (error);
} else
fsdev->nd_last_fsarea = (j + 1) % NANDFS_NFSAREAS;
return (0);
}
static int
nandfs_select_fsdata(struct nandfs_device *fsdev,
struct nandfs_fsdata *fsdatat, struct nandfs_fsdata **fsdata, int nfsds)
{
int i;
*fsdata = NULL;
for (i = 0; i < nfsds; i++) {
DPRINTF(VOLUMES, ("%s: i %d f_magic %x f_crc %x\n", __func__,
i, fsdatat[i].f_magic, fsdatat[i].f_sum));
if (!nandfs_check_fsdata_crc(&fsdatat[i]))
continue;
*fsdata = &fsdatat[i];
break;
}
return (*fsdata != NULL ? 0 : EINVAL);
}
static int
nandfs_select_sb(struct nandfs_device *fsdev,
struct nandfs_super_block *supert, struct nandfs_super_block **super,
int nsbs)
{
int i;
*super = NULL;
for (i = 0; i < nsbs; i++) {
if (!nandfs_check_superblock_crc(&fsdev->nd_fsdata, &supert[i]))
continue;
DPRINTF(SYNC, ("%s: i %d s_last_cno %jx s_magic %x "
"s_wtime %jd\n", __func__, i, supert[i].s_last_cno,
supert[i].s_magic, supert[i].s_wtime));
if (*super == NULL || supert[i].s_last_cno >
(*super)->s_last_cno)
*super = &supert[i];
}
return (*super != NULL ? 0 : EINVAL);
}
static int
nandfs_read_structures_at(struct nandfs_device *fsdev,
struct nandfs_fsarea *fstp, struct nandfs_fsdata *fsdata,
struct nandfs_super_block *super)
{
struct nandfs_super_block *tsuper, *tsuperd;
struct buf *bp;
int error, read_size;
int i;
int offset;
offset = fstp->offset;
if (fsdev->nd_erasesize > MAXBSIZE)
read_size = MAXBSIZE;
else
read_size = fsdev->nd_erasesize;
error = bread(fsdev->nd_devvp, btodb(offset), read_size, NOCRED, &bp);
if (error) {
printf("couldn't read: %d\n", error);
brelse(bp);
fstp->flags |= NANDFS_FSSTOR_FAILED;
return (error);
}
tsuper = super;
memcpy(fsdata, bp->b_data, sizeof(struct nandfs_fsdata));
memcpy(tsuper, (bp->b_data + sizeof(struct nandfs_fsdata)),
read_size - sizeof(struct nandfs_fsdata));
brelse(bp);
tsuper += (read_size - sizeof(struct nandfs_fsdata)) /
sizeof(struct nandfs_super_block);
for (i = 1; i < fsdev->nd_erasesize / read_size; i++) {
error = bread(fsdev->nd_devvp, btodb(offset + i * read_size),
read_size, NOCRED, &bp);
if (error) {
printf("couldn't read: %d\n", error);
brelse(bp);
fstp->flags |= NANDFS_FSSTOR_FAILED;
return (error);
}
memcpy(tsuper, bp->b_data, read_size);
tsuper += read_size / sizeof(struct nandfs_super_block);
brelse(bp);
}
tsuper -= 1;
fstp->last_used = nandfs_sblocks_in_esize(fsdev) - 1;
for (tsuperd = super - 1; (tsuper != tsuperd); tsuper -= 1) {
if (nandfs_is_empty((u_char *)tsuper, sizeof(*tsuper)))
fstp->last_used--;
else
break;
}
DPRINTF(VOLUMES, ("%s: last_used %d\n", __func__, fstp->last_used));
return (0);
}
static int
nandfs_read_structures(struct nandfs_device *fsdev)
{
struct nandfs_fsdata *fsdata, *fsdatat;
struct nandfs_super_block *sblocks, *ssblock;
int nsbs, nfsds, i;
int error = 0;
int nrsbs;
nfsds = NANDFS_NFSAREAS;
nsbs = nandfs_max_sblocks(fsdev);
fsdatat = malloc(sizeof(struct nandfs_fsdata) * nfsds, M_NANDFSTEMP,
M_WAITOK | M_ZERO);
sblocks = malloc(sizeof(struct nandfs_super_block) * nsbs, M_NANDFSTEMP,
M_WAITOK | M_ZERO);
nrsbs = 0;
for (i = 0; i < NANDFS_NFSAREAS; i++) {
fsdev->nd_fsarea[i].offset = i * fsdev->nd_erasesize;
error = nandfs_read_structures_at(fsdev, &fsdev->nd_fsarea[i],
&fsdatat[i], sblocks + nrsbs);
if (error)
continue;
nrsbs += (fsdev->nd_fsarea[i].last_used + 1);
if (fsdev->nd_fsarea[fsdev->nd_last_fsarea].last_used >
fsdev->nd_fsarea[i].last_used)
fsdev->nd_last_fsarea = i;
}
if (nrsbs == 0) {
printf("nandfs: no valid superblocks found\n");
error = EINVAL;
goto out;
}
error = nandfs_select_fsdata(fsdev, fsdatat, &fsdata, nfsds);
if (error)
goto out;
memcpy(&fsdev->nd_fsdata, fsdata, sizeof(struct nandfs_fsdata));
error = nandfs_select_sb(fsdev, sblocks, &ssblock, nsbs);
if (error)
goto out;
memcpy(&fsdev->nd_super, ssblock, sizeof(struct nandfs_super_block));
out:
free(fsdatat, M_NANDFSTEMP);
free(sblocks, M_NANDFSTEMP);
if (error == 0)
DPRINTF(VOLUMES, ("%s: selected sb with w_time %jd "
"last_pseg %#jx\n", __func__, fsdev->nd_super.s_wtime,
fsdev->nd_super.s_last_pseg));
return (error);
}
static void
nandfs_unmount_base(struct nandfs_device *nandfsdev)
{
int error;
if (!nandfsdev)
return;
/* Remove all our information */
error = vinvalbuf(nandfsdev->nd_devvp, V_SAVE, 0, 0);
if (error) {
/*
* Flushing buffers failed when fs was umounting, can't do
* much now, just printf error and continue with umount.
*/
nandfs_error("%s(): error:%d when umounting FS\n",
__func__, error);
}
/* Release the device's system nodes */
nandfs_release_system_nodes(nandfsdev);
}
static void
nandfs_get_ncleanseg(struct nandfs_device *nandfsdev)
{
struct nandfs_seg_stat nss;
nandfs_get_seg_stat(nandfsdev, &nss);
nandfsdev->nd_clean_segs = nss.nss_ncleansegs;
DPRINTF(VOLUMES, ("nandfs_mount: clean segs: %jx\n",
(uintmax_t)nandfsdev->nd_clean_segs));
}
static int
nandfs_mount_base(struct nandfs_device *nandfsdev, struct mount *mp,
struct nandfs_args *args)
{
uint32_t log_blocksize;
int error;
/* Flush out any old buffers remaining from a previous use. */
if ((error = vinvalbuf(nandfsdev->nd_devvp, V_SAVE, 0, 0)))
return (error);
error = nandfs_read_structures(nandfsdev);
if (error) {
printf("nandfs: could not get valid filesystem structures\n");
return (error);
}
if (nandfsdev->nd_fsdata.f_rev_level != NANDFS_CURRENT_REV) {
printf("nandfs: unsupported file system revision: %d "
"(supported is %d).\n", nandfsdev->nd_fsdata.f_rev_level,
NANDFS_CURRENT_REV);
return (EINVAL);
}
if (nandfsdev->nd_fsdata.f_erasesize != nandfsdev->nd_erasesize) {
printf("nandfs: erasesize mismatch (device %#x, fs %#x)\n",
nandfsdev->nd_erasesize, nandfsdev->nd_fsdata.f_erasesize);
return (EINVAL);
}
/* Get our blocksize */
log_blocksize = nandfsdev->nd_fsdata.f_log_block_size;
nandfsdev->nd_blocksize = (uint64_t) 1 << (log_blocksize + 10);
DPRINTF(VOLUMES, ("%s: blocksize:%x\n", __func__,
nandfsdev->nd_blocksize));
DPRINTF(VOLUMES, ("%s: accepted super block with cp %#jx\n", __func__,
(uintmax_t)nandfsdev->nd_super.s_last_cno));
/* Calculate dat structure parameters */
nandfs_calc_mdt_consts(nandfsdev, &nandfsdev->nd_dat_mdt,
nandfsdev->nd_fsdata.f_dat_entry_size);
nandfs_calc_mdt_consts(nandfsdev, &nandfsdev->nd_ifile_mdt,
nandfsdev->nd_fsdata.f_inode_size);
/* Search for the super root and roll forward when needed */
if (nandfs_search_super_root(nandfsdev)) {
printf("Cannot find valid SuperRoot\n");
return (EINVAL);
}
nandfsdev->nd_mount_state = nandfsdev->nd_super.s_state;
if (nandfsdev->nd_mount_state != NANDFS_VALID_FS) {
printf("FS is seriously damaged, needs repairing\n");
printf("aborting mount\n");
return (EINVAL);
}
/*
* FS should be ok now. The superblock and the last segsum could be
* updated from the repair so extract running values again.
*/
nandfsdev->nd_last_pseg = nandfsdev->nd_super.s_last_pseg;
nandfsdev->nd_seg_sequence = nandfsdev->nd_super.s_last_seq;
nandfsdev->nd_seg_num = nandfs_get_segnum_of_block(nandfsdev,
nandfsdev->nd_last_pseg);
nandfsdev->nd_next_seg_num = nandfs_get_segnum_of_block(nandfsdev,
nandfsdev->nd_last_segsum.ss_next);
nandfsdev->nd_ts.tv_sec = nandfsdev->nd_last_segsum.ss_create;
nandfsdev->nd_last_cno = nandfsdev->nd_super.s_last_cno;
nandfsdev->nd_fakevblk = 1;
nandfsdev->nd_last_ino = NANDFS_USER_INO;
DPRINTF(VOLUMES, ("%s: last_pseg %#jx last_cno %#jx last_seq %#jx\n"
"fsdev: last_seg: seq %#jx num %#jx, next_seg_num %#jx\n",
__func__, (uintmax_t)nandfsdev->nd_last_pseg,
(uintmax_t)nandfsdev->nd_last_cno,
(uintmax_t)nandfsdev->nd_seg_sequence,
(uintmax_t)nandfsdev->nd_seg_sequence,
(uintmax_t)nandfsdev->nd_seg_num,
(uintmax_t)nandfsdev->nd_next_seg_num));
DPRINTF(VOLUMES, ("nandfs_mount: accepted super root\n"));
/* Create system vnodes for DAT, CP and SEGSUM */
error = nandfs_create_system_nodes(nandfsdev);
if (error)
nandfs_unmount_base(nandfsdev);
nandfs_get_ncleanseg(nandfsdev);
return (error);
}
static void
nandfs_unmount_device(struct nandfs_device *nandfsdev)
{
/* Is there anything? */
if (nandfsdev == NULL)
return;
/* Remove the device only if we're the last reference */
nandfsdev->nd_refcnt--;
if (nandfsdev->nd_refcnt >= 1)
return;
MPASS(nandfsdev->nd_syncer == NULL);
MPASS(nandfsdev->nd_cleaner == NULL);
MPASS(nandfsdev->nd_free_base == NULL);
/* Unmount our base */
nandfs_unmount_base(nandfsdev);
/* Remove from our device list */
SLIST_REMOVE(&nandfs_devices, nandfsdev, nandfs_device, nd_next_device);
DROP_GIANT();
g_topology_lock();
g_vfs_close(nandfsdev->nd_gconsumer);
g_topology_unlock();
PICKUP_GIANT();
DPRINTF(VOLUMES, ("closing device\n"));
/* Clear our mount reference and release device node */
vrele(nandfsdev->nd_devvp);
dev_rel(nandfsdev->nd_devvp->v_rdev);
/* Free our device info */
cv_destroy(&nandfsdev->nd_sync_cv);
mtx_destroy(&nandfsdev->nd_sync_mtx);
cv_destroy(&nandfsdev->nd_clean_cv);
mtx_destroy(&nandfsdev->nd_clean_mtx);
mtx_destroy(&nandfsdev->nd_mutex);
lockdestroy(&nandfsdev->nd_seg_const);
free(nandfsdev, M_NANDFSMNT);
}
static int
nandfs_check_mounts(struct nandfs_device *nandfsdev, struct mount *mp,
struct nandfs_args *args)
{
struct nandfsmount *nmp;
uint64_t last_cno;
/* no double-mounting of the same checkpoint */
STAILQ_FOREACH(nmp, &nandfsdev->nd_mounts, nm_next_mount) {
if (nmp->nm_mount_args.cpno == args->cpno)
return (EBUSY);
}
/* Allow readonly mounts without questioning here */
if (mp->mnt_flag & MNT_RDONLY)
return (0);
/* Read/write mount */
STAILQ_FOREACH(nmp, &nandfsdev->nd_mounts, nm_next_mount) {
/* Only one RW mount on this device! */
if ((nmp->nm_vfs_mountp->mnt_flag & MNT_RDONLY)==0)
return (EROFS);
/* RDONLY on last mountpoint is device busy */
last_cno = nmp->nm_nandfsdev->nd_super.s_last_cno;
if (nmp->nm_mount_args.cpno == last_cno)
return (EBUSY);
}
/* OK for now */
return (0);
}
static int
nandfs_mount_device(struct vnode *devvp, struct mount *mp,
struct nandfs_args *args, struct nandfs_device **nandfsdev_p)
{
struct nandfs_device *nandfsdev;
struct g_provider *pp;
struct g_consumer *cp;
struct cdev *dev;
uint32_t erasesize;
int error, size;
int ronly;
DPRINTF(VOLUMES, ("Mounting NANDFS device\n"));
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
/* Look up device in our nandfs_mountpoints */
*nandfsdev_p = NULL;
SLIST_FOREACH(nandfsdev, &nandfs_devices, nd_next_device)
if (nandfsdev->nd_devvp == devvp)
break;
if (nandfsdev) {
DPRINTF(VOLUMES, ("device already mounted\n"));
error = nandfs_check_mounts(nandfsdev, mp, args);
if (error)
return error;
nandfsdev->nd_refcnt++;
*nandfsdev_p = nandfsdev;
if (!ronly) {
DROP_GIANT();
g_topology_lock();
error = g_access(nandfsdev->nd_gconsumer, 0, 1, 0);
g_topology_unlock();
PICKUP_GIANT();
}
return (error);
}
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
dev = devvp->v_rdev;
dev_ref(dev);
DROP_GIANT();
g_topology_lock();
error = g_vfs_open(devvp, &cp, "nandfs", ronly ? 0 : 1);
pp = g_dev_getprovider(dev);
g_topology_unlock();
PICKUP_GIANT();
VOP_UNLOCK(devvp, 0);
if (error) {
dev_rel(dev);
return (error);
}
nandfsdev = malloc(sizeof(struct nandfs_device), M_NANDFSMNT, M_WAITOK | M_ZERO);
/* Initialise */
nandfsdev->nd_refcnt = 1;
nandfsdev->nd_devvp = devvp;
nandfsdev->nd_syncing = 0;
nandfsdev->nd_cleaning = 0;
nandfsdev->nd_gconsumer = cp;
cv_init(&nandfsdev->nd_sync_cv, "nandfssync");
mtx_init(&nandfsdev->nd_sync_mtx, "nffssyncmtx", NULL, MTX_DEF);
cv_init(&nandfsdev->nd_clean_cv, "nandfsclean");
mtx_init(&nandfsdev->nd_clean_mtx, "nffscleanmtx", NULL, MTX_DEF);
mtx_init(&nandfsdev->nd_mutex, "nandfsdev lock", NULL, MTX_DEF);
lockinit(&nandfsdev->nd_seg_const, PVFS, "nffssegcon", VLKTIMEOUT,
LK_CANRECURSE);
STAILQ_INIT(&nandfsdev->nd_mounts);
nandfsdev->nd_devsize = pp->mediasize;
nandfsdev->nd_devblocksize = pp->sectorsize;
size = sizeof(erasesize);
error = g_io_getattr("NAND::blocksize", nandfsdev->nd_gconsumer, &size,
&erasesize);
if (error) {
DPRINTF(VOLUMES, ("couldn't get erasesize: %d\n", error));
if (error == ENOIOCTL || error == EOPNOTSUPP) {
/*
* We conclude that this is not NAND storage
*/
nandfsdev->nd_erasesize = NANDFS_DEF_ERASESIZE;
nandfsdev->nd_is_nand = 0;
} else {
DROP_GIANT();
g_topology_lock();
g_vfs_close(nandfsdev->nd_gconsumer);
g_topology_unlock();
PICKUP_GIANT();
dev_rel(dev);
free(nandfsdev, M_NANDFSMNT);
return (error);
}
} else {
nandfsdev->nd_erasesize = erasesize;
nandfsdev->nd_is_nand = 1;
}
DPRINTF(VOLUMES, ("%s: erasesize %x\n", __func__,
nandfsdev->nd_erasesize));
/* Register nandfs_device in list */
SLIST_INSERT_HEAD(&nandfs_devices, nandfsdev, nd_next_device);
error = nandfs_mount_base(nandfsdev, mp, args);
if (error) {
/* Remove all our information */
nandfs_unmount_device(nandfsdev);
return (EINVAL);
}
nandfsdev->nd_maxfilesize = nandfs_get_maxfilesize(nandfsdev);
*nandfsdev_p = nandfsdev;
DPRINTF(VOLUMES, ("NANDFS device mounted ok\n"));
return (0);
}
static int
nandfs_mount_checkpoint(struct nandfsmount *nmp)
{
struct nandfs_cpfile_header *cphdr;
struct nandfs_checkpoint *cp;
struct nandfs_inode ifile_inode;
struct nandfs_node *cp_node;
struct buf *bp;
uint64_t ncp, nsn, cpno, fcpno, blocknr, last_cno;
uint32_t off, dlen;
int cp_per_block, error;
cpno = nmp->nm_mount_args.cpno;
if (cpno == 0)
cpno = nmp->nm_nandfsdev->nd_super.s_last_cno;
DPRINTF(VOLUMES, ("%s: trying to mount checkpoint number %"PRIu64"\n",
__func__, cpno));
cp_node = nmp->nm_nandfsdev->nd_cp_node;
VOP_LOCK(NTOV(cp_node), LK_SHARED);
/* Get cpfile header from 1st block of cp file */
error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
if (error) {
brelse(bp);
VOP_UNLOCK(NTOV(cp_node), 0);
return (error);
}
cphdr = (struct nandfs_cpfile_header *) bp->b_data;
ncp = cphdr->ch_ncheckpoints;
nsn = cphdr->ch_nsnapshots;
brelse(bp);
DPRINTF(VOLUMES, ("mount_nandfs: checkpoint header read in\n"));
DPRINTF(VOLUMES, ("\tNumber of checkpoints %"PRIu64"\n", ncp));
DPRINTF(VOLUMES, ("\tNumber of snapshots %"PRIu64"\n", nsn));
/* Read in our specified checkpoint */
dlen = nmp->nm_nandfsdev->nd_fsdata.f_checkpoint_size;
cp_per_block = nmp->nm_nandfsdev->nd_blocksize / dlen;
fcpno = cpno + NANDFS_CPFILE_FIRST_CHECKPOINT_OFFSET - 1;
blocknr = fcpno / cp_per_block;
off = (fcpno % cp_per_block) * dlen;
error = nandfs_bread(cp_node, blocknr, NOCRED, 0, &bp);
if (error) {
brelse(bp);
VOP_UNLOCK(NTOV(cp_node), 0);
printf("mount_nandfs: couldn't read cp block %"PRIu64"\n",
fcpno);
return (EINVAL);
}
/* Needs to be a valid checkpoint */
cp = (struct nandfs_checkpoint *) ((uint8_t *) bp->b_data + off);
if (cp->cp_flags & NANDFS_CHECKPOINT_INVALID) {
printf("mount_nandfs: checkpoint marked invalid\n");
brelse(bp);
VOP_UNLOCK(NTOV(cp_node), 0);
return (EINVAL);
}
/* Is this really the checkpoint we want? */
if (cp->cp_cno != cpno) {
printf("mount_nandfs: checkpoint file corrupt? "
"expected cpno %"PRIu64", found cpno %"PRIu64"\n",
cpno, cp->cp_cno);
brelse(bp);
VOP_UNLOCK(NTOV(cp_node), 0);
return (EINVAL);
}
/* Check if it's a snapshot ! */
last_cno = nmp->nm_nandfsdev->nd_super.s_last_cno;
if (cpno != last_cno) {
/* Only allow snapshots if not mounting on the last cp */
if ((cp->cp_flags & NANDFS_CHECKPOINT_SNAPSHOT) == 0) {
printf( "mount_nandfs: checkpoint %"PRIu64" is not a "
"snapshot\n", cpno);
brelse(bp);
VOP_UNLOCK(NTOV(cp_node), 0);
return (EINVAL);
}
}
ifile_inode = cp->cp_ifile_inode;
brelse(bp);
/* Get ifile inode */
error = nandfs_get_node_raw(nmp->nm_nandfsdev, NULL, NANDFS_IFILE_INO,
&ifile_inode, &nmp->nm_ifile_node);
if (error) {
printf("mount_nandfs: can't read ifile node\n");
VOP_UNLOCK(NTOV(cp_node), 0);
return (EINVAL);
}
NANDFS_SET_SYSTEMFILE(NTOV(nmp->nm_ifile_node));
VOP_UNLOCK(NTOV(cp_node), 0);
/* Get root node? */
return (0);
}
static void
free_nandfs_mountinfo(struct mount *mp)
{
struct nandfsmount *nmp = VFSTONANDFS(mp);
if (nmp == NULL)
return;
free(nmp, M_NANDFSMNT);
}
void
nandfs_wakeup_wait_sync(struct nandfs_device *nffsdev, int reason)
{
char *reasons[] = {
"umount",
"vfssync",
"bdflush",
"fforce",
"fsync",
"ro_upd"
};
DPRINTF(SYNC, ("%s: %s\n", __func__, reasons[reason]));
mtx_lock(&nffsdev->nd_sync_mtx);
if (nffsdev->nd_syncing)
cv_wait(&nffsdev->nd_sync_cv, &nffsdev->nd_sync_mtx);
if (reason == SYNCER_UMOUNT)
nffsdev->nd_syncer_exit = 1;
nffsdev->nd_syncing = 1;
wakeup(&nffsdev->nd_syncing);
cv_wait(&nffsdev->nd_sync_cv, &nffsdev->nd_sync_mtx);
mtx_unlock(&nffsdev->nd_sync_mtx);
}
static void
nandfs_gc_finished(struct nandfs_device *nffsdev, int exit)
{
int error;
mtx_lock(&nffsdev->nd_sync_mtx);
nffsdev->nd_syncing = 0;
DPRINTF(SYNC, ("%s: cleaner finish\n", __func__));
cv_broadcast(&nffsdev->nd_sync_cv);
mtx_unlock(&nffsdev->nd_sync_mtx);
if (!exit) {
error = tsleep(&nffsdev->nd_syncing, PRIBIO, "-",
hz * nandfs_sync_interval);
DPRINTF(SYNC, ("%s: cleaner waked up: %d\n",
__func__, error));
}
}
static void
nandfs_syncer(struct nandfsmount *nmp)
{
struct nandfs_device *nffsdev;
struct mount *mp;
int flags, error;
mp = nmp->nm_vfs_mountp;
nffsdev = nmp->nm_nandfsdev;
tsleep(&nffsdev->nd_syncing, PRIBIO, "-", hz * nandfs_sync_interval);
while (!nffsdev->nd_syncer_exit) {
DPRINTF(SYNC, ("%s: syncer run\n", __func__));
nffsdev->nd_syncing = 1;
flags = (nmp->nm_flags & (NANDFS_FORCE_SYNCER | NANDFS_UMOUNT));
error = nandfs_segment_constructor(nmp, flags);
if (error)
nandfs_error("%s: error:%d when creating segments\n",
__func__, error);
nmp->nm_flags &= ~flags;
nandfs_gc_finished(nffsdev, 0);
}
MPASS(nffsdev->nd_cleaner == NULL);
error = nandfs_segment_constructor(nmp,
NANDFS_FORCE_SYNCER | NANDFS_UMOUNT);
if (error)
nandfs_error("%s: error:%d when creating segments\n",
__func__, error);
nandfs_gc_finished(nffsdev, 1);
nffsdev->nd_syncer = NULL;
MPASS(nffsdev->nd_free_base == NULL);
DPRINTF(SYNC, ("%s: exiting\n", __func__));
kthread_exit();
}
static int
start_syncer(struct nandfsmount *nmp)
{
int error;
MPASS(nmp->nm_nandfsdev->nd_syncer == NULL);
DPRINTF(SYNC, ("%s: start syncer\n", __func__));
nmp->nm_nandfsdev->nd_syncer_exit = 0;
error = kthread_add((void(*)(void *))nandfs_syncer, nmp, NULL,
&nmp->nm_nandfsdev->nd_syncer, 0, 0, "nandfs_syncer");
if (error)
printf("nandfs: could not start syncer: %d\n", error);
return (error);
}
static int
stop_syncer(struct nandfsmount *nmp)
{
MPASS(nmp->nm_nandfsdev->nd_syncer != NULL);
nandfs_wakeup_wait_sync(nmp->nm_nandfsdev, SYNCER_UMOUNT);
DPRINTF(SYNC, ("%s: stop syncer\n", __func__));
return (0);
}
/*
* Mount null layer
*/
static int
nandfs_mount(struct mount *mp)
{
struct nandfsmount *nmp;
struct vnode *devvp;
struct nameidata nd;
struct vfsoptlist *opts;
struct thread *td;
char *from;
int error = 0, flags;
DPRINTF(VOLUMES, ("%s: mp = %p\n", __func__, (void *)mp));
td = curthread;
opts = mp->mnt_optnew;
if (vfs_filteropt(opts, nandfs_opts))
return (EINVAL);
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONANDFS(mp);
if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) {
return (error);
}
if (!(nmp->nm_ronly) && vfs_flagopt(opts, "ro", NULL, 0)) {
vn_start_write(NULL, &mp, V_WAIT);
error = VFS_SYNC(mp, MNT_WAIT);
if (error)
return (error);
vn_finished_write(mp);
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
nandfs_wakeup_wait_sync(nmp->nm_nandfsdev,
SYNCER_ROUPD);
error = vflush(mp, 0, flags, td);
if (error)
return (error);
nandfs_stop_cleaner(nmp->nm_nandfsdev);
stop_syncer(nmp);
DROP_GIANT();
g_topology_lock();
g_access(nmp->nm_nandfsdev->nd_gconsumer, 0, -1, 0);
g_topology_unlock();
PICKUP_GIANT();
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_RDONLY;
MNT_IUNLOCK(mp);
nmp->nm_ronly = 1;
} else if ((nmp->nm_ronly) &&
!vfs_flagopt(opts, "ro", NULL, 0)) {
/*
* Don't allow read-write snapshots.
*/
if (nmp->nm_mount_args.cpno != 0)
return (EROFS);
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
devvp = nmp->nm_nandfsdev->nd_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, VREAD | VWRITE,
td->td_ucred, td);
if (error) {
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
VOP_UNLOCK(devvp, 0);
return (error);
}
}
VOP_UNLOCK(devvp, 0);
DROP_GIANT();
g_topology_lock();
error = g_access(nmp->nm_nandfsdev->nd_gconsumer, 0, 1,
0);
g_topology_unlock();
PICKUP_GIANT();
if (error)
return (error);
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_RDONLY;
MNT_IUNLOCK(mp);
error = start_syncer(nmp);
if (error == 0)
error = nandfs_start_cleaner(nmp->nm_nandfsdev);
if (error) {
DROP_GIANT();
g_topology_lock();
g_access(nmp->nm_nandfsdev->nd_gconsumer, 0, -1,
0);
g_topology_unlock();
PICKUP_GIANT();
return (error);
}
nmp->nm_ronly = 0;
}
return (0);
}
from = vfs_getopts(opts, "from", &error);
if (error)
return (error);
/*
* Find device node
*/
NDINIT(&nd, LOOKUP, FOLLOW|LOCKLEAF, UIO_SYSSPACE, from, curthread);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
devvp = nd.ni_vp;
if (!vn_isdisk(devvp, &error)) {
vput(devvp);
return (error);
}
/* Check the access rights on the mount device */
error = VOP_ACCESS(devvp, VREAD, curthread->td_ucred, curthread);
if (error)
error = priv_check(curthread, PRIV_VFS_MOUNT_PERM);
if (error) {
vput(devvp);
return (error);
}
vfs_getnewfsid(mp);
error = nandfs_mountfs(devvp, mp);
if (error)
return (error);
vfs_mountedfrom(mp, from);
return (0);
}
static int
nandfs_mountfs(struct vnode *devvp, struct mount *mp)
{
struct nandfsmount *nmp = NULL;
struct nandfs_args *args = NULL;
struct nandfs_device *nandfsdev;
char *from;
int error, ronly;
char *cpno;
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
if (devvp->v_rdev->si_iosize_max != 0)
mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
VOP_UNLOCK(devvp, 0);
if (mp->mnt_iosize_max > MAXPHYS)
mp->mnt_iosize_max = MAXPHYS;
from = vfs_getopts(mp->mnt_optnew, "from", &error);
if (error)
goto error;
error = vfs_getopt(mp->mnt_optnew, "snap", (void **)&cpno, NULL);
if (error == ENOENT)
cpno = NULL;
else if (error)
goto error;
args = (struct nandfs_args *)malloc(sizeof(struct nandfs_args),
M_NANDFSMNT, M_WAITOK | M_ZERO);
if (cpno != NULL)
args->cpno = strtoul(cpno, (char **)NULL, 10);
else
args->cpno = 0;
args->fspec = from;
if (args->cpno != 0 && !ronly) {
error = EROFS;
goto error;
}
printf("WARNING: NANDFS is considered to be a highly experimental "
"feature in FreeBSD.\n");
error = nandfs_mount_device(devvp, mp, args, &nandfsdev);
if (error)
goto error;
nmp = (struct nandfsmount *) malloc(sizeof(struct nandfsmount),
M_NANDFSMNT, M_WAITOK | M_ZERO);
mp->mnt_data = nmp;
nmp->nm_vfs_mountp = mp;
nmp->nm_ronly = ronly;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_kern_flag |= MNTK_MPSAFE;
MNT_IUNLOCK(mp);
nmp->nm_nandfsdev = nandfsdev;
/* Add our mountpoint */
STAILQ_INSERT_TAIL(&nandfsdev->nd_mounts, nmp, nm_next_mount);
if (args->cpno > nandfsdev->nd_last_cno) {
printf("WARNING: supplied checkpoint number (%jd) is greater "
"than last known checkpoint on filesystem (%jd). Mounting"
" checkpoint %jd\n", (uintmax_t)args->cpno,
(uintmax_t)nandfsdev->nd_last_cno,
(uintmax_t)nandfsdev->nd_last_cno);
args->cpno = nandfsdev->nd_last_cno;
}
/* Setting up other parameters */
nmp->nm_mount_args = *args;
free(args, M_NANDFSMNT);
error = nandfs_mount_checkpoint(nmp);
if (error) {
nandfs_unmount(mp, MNT_FORCE);
goto unmounted;
}
if (!ronly) {
error = start_syncer(nmp);
if (error == 0)
error = nandfs_start_cleaner(nmp->nm_nandfsdev);
if (error)
nandfs_unmount(mp, MNT_FORCE);
}
return (0);
error:
if (args != NULL)
free(args, M_NANDFSMNT);
if (nmp != NULL) {
free(nmp, M_NANDFSMNT);
mp->mnt_data = NULL;
}
unmounted:
return (error);
}
static int
nandfs_unmount(struct mount *mp, int mntflags)
{
struct nandfs_device *nandfsdev;
struct nandfsmount *nmp;
int error;
int flags = 0;
DPRINTF(VOLUMES, ("%s: mp = %p\n", __func__, (void *)mp));
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
nmp = mp->mnt_data;
nandfsdev = nmp->nm_nandfsdev;
error = vflush(mp, 0, flags | SKIPSYSTEM, curthread);
if (error)
return (error);
if (!(nmp->nm_ronly)) {
nandfs_stop_cleaner(nandfsdev);
stop_syncer(nmp);
}
if (nmp->nm_ifile_node)
NANDFS_UNSET_SYSTEMFILE(NTOV(nmp->nm_ifile_node));
/* Remove our mount point */
STAILQ_REMOVE(&nandfsdev->nd_mounts, nmp, nandfsmount, nm_next_mount);
/* Unmount the device itself when we're the last one */
nandfs_unmount_device(nandfsdev);
free_nandfs_mountinfo(mp);
/*
* Finally, throw away the null_mount structure
*/
mp->mnt_data = 0;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp);
return (0);
}
static int
nandfs_statfs(struct mount *mp, struct statfs *sbp)
{
struct nandfsmount *nmp;
struct nandfs_device *nandfsdev;
struct nandfs_fsdata *fsdata;
struct nandfs_super_block *sb;
struct nandfs_block_group_desc *groups;
struct nandfs_node *ifile;
struct nandfs_mdt *mdt;
struct buf *bp;
int i, error;
uint32_t entries_per_group;
uint64_t files = 0;
nmp = mp->mnt_data;
nandfsdev = nmp->nm_nandfsdev;
fsdata = &nandfsdev->nd_fsdata;
sb = &nandfsdev->nd_super;
ifile = nmp->nm_ifile_node;
mdt = &nandfsdev->nd_ifile_mdt;
entries_per_group = mdt->entries_per_group;
VOP_LOCK(NTOV(ifile), LK_SHARED);
error = nandfs_bread(ifile, 0, NOCRED, 0, &bp);
if (error) {
brelse(bp);
VOP_UNLOCK(NTOV(ifile), 0);
return (error);
}
groups = (struct nandfs_block_group_desc *)bp->b_data;
for (i = 0; i < mdt->groups_per_desc_block; i++)
files += (entries_per_group - groups[i].bg_nfrees);
brelse(bp);
VOP_UNLOCK(NTOV(ifile), 0);
sbp->f_bsize = nandfsdev->nd_blocksize;
sbp->f_iosize = sbp->f_bsize;
sbp->f_blocks = fsdata->f_blocks_per_segment * fsdata->f_nsegments;
sbp->f_bfree = sb->s_free_blocks_count;
sbp->f_bavail = sbp->f_bfree;
sbp->f_files = files;
sbp->f_ffree = 0;
return (0);
}
static int
nandfs_root(struct mount *mp, int flags, struct vnode **vpp)
{
struct nandfsmount *nmp = VFSTONANDFS(mp);
struct nandfs_node *node;
int error;
error = nandfs_get_node(nmp, NANDFS_ROOT_INO, &node);
if (error)
return (error);
KASSERT(NTOV(node)->v_vflag & VV_ROOT,
("root_vp->v_vflag & VV_ROOT"));
*vpp = NTOV(node);
return (error);
}
static int
nandfs_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
{
struct nandfsmount *nmp = VFSTONANDFS(mp);
struct nandfs_node *node;
int error;
error = nandfs_get_node(nmp, ino, &node);
if (node)
*vpp = NTOV(node);
return (error);
}
static int
nandfs_sync(struct mount *mp, int waitfor)
{
struct nandfsmount *nmp = VFSTONANDFS(mp);
DPRINTF(SYNC, ("%s: mp %p waitfor %d\n", __func__, mp, waitfor));
/*
* XXX: A hack to be removed soon
*/
if (waitfor == MNT_LAZY)
return (0);
if (waitfor == MNT_SUSPEND)
return (0);
nandfs_wakeup_wait_sync(nmp->nm_nandfsdev, SYNCER_VFS_SYNC);
return (0);
}
static struct vfsops nandfs_vfsops = {
.vfs_init = nandfs_init,
.vfs_mount = nandfs_mount,
.vfs_root = nandfs_root,
.vfs_statfs = nandfs_statfs,
.vfs_uninit = nandfs_uninit,
.vfs_unmount = nandfs_unmount,
.vfs_vget = nandfs_vget,
.vfs_sync = nandfs_sync,
};
VFS_SET(nandfs_vfsops, nandfs, VFCF_LOOPBACK);