linux-stable/fs/xfs/xfs_qm.c
Darrick J. Wong 86d40f1e49 xfs: purge dquots after inode walk fails during quotacheck
xfs/434 and xfs/436 have been reporting occasional memory leaks of
xfs_dquot objects.  These tests themselves were the messenger, not the
culprit, since they unload the xfs module, which trips the slub
debugging code while tearing down all the xfs slab caches:

=============================================================================
BUG xfs_dquot (Tainted: G        W        ): Objects remaining in xfs_dquot on __kmem_cache_shutdown()
-----------------------------------------------------------------------------

Slab 0xffffea000606de00 objects=30 used=5 fp=0xffff888181b78a78 flags=0x17ff80000010200(slab|head|node=0|zone=2|lastcpupid=0xfff)
CPU: 0 PID: 3953166 Comm: modprobe Tainted: G        W         5.18.0-rc6-djwx #rc6 d5824be9e46a2393677bda868f9b154d917ca6a7
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20171121_152543-x86-ol7-builder-01.us.oracle.com-4.el7.1 04/01/2014

Since we don't generally rmmod the xfs module between fstests, this
means that xfs/434 is really just the canary in the coal mine --
something leaked a dquot, but we don't know who.  After days of pounding
on fstests with kmemleak enabled, I finally got it to spit this out:

unreferenced object 0xffff8880465654c0 (size 536):
  comm "u10:4", pid 88, jiffies 4294935810 (age 29.512s)
  hex dump (first 32 bytes):
    60 4a 56 46 80 88 ff ff 58 ea e4 5c 80 88 ff ff  `JVF....X..\....
    00 e0 52 49 80 88 ff ff 01 00 01 00 00 00 00 00  ..RI............
  backtrace:
    [<ffffffffa0740f6c>] xfs_dquot_alloc+0x2c/0x530 [xfs]
    [<ffffffffa07443df>] xfs_qm_dqread+0x6f/0x330 [xfs]
    [<ffffffffa07462a2>] xfs_qm_dqget+0x132/0x4e0 [xfs]
    [<ffffffffa0756bb0>] xfs_qm_quotacheck_dqadjust+0xa0/0x3e0 [xfs]
    [<ffffffffa075724d>] xfs_qm_dqusage_adjust+0x35d/0x4f0 [xfs]
    [<ffffffffa06c9068>] xfs_iwalk_ag_recs+0x348/0x5d0 [xfs]
    [<ffffffffa06c95d3>] xfs_iwalk_run_callbacks+0x273/0x540 [xfs]
    [<ffffffffa06c9e8d>] xfs_iwalk_ag+0x5ed/0x890 [xfs]
    [<ffffffffa06ca22f>] xfs_iwalk_ag_work+0xff/0x170 [xfs]
    [<ffffffffa06d22c9>] xfs_pwork_work+0x79/0x130 [xfs]
    [<ffffffff81170bb2>] process_one_work+0x672/0x1040
    [<ffffffff81171b1b>] worker_thread+0x59b/0xec0
    [<ffffffff8118711e>] kthread+0x29e/0x340
    [<ffffffff810032bf>] ret_from_fork+0x1f/0x30

Now we know that quotacheck is at fault, but even this report was
canaryish -- it was triggered by xfs/494, which doesn't actually mount
any filesystems.  (kmemleak can be a little slow to notice leaks, even
with fstests repeatedly whacking it to look for them.)  Looking at the
*previous* fstest, however, showed that the test run before xfs/494 was
xfs/117.  The tipoff to the problem is in this excerpt from dmesg:

XFS (sda4): Quotacheck needed: Please wait.
XFS (sda4): Metadata corruption detected at xfs_dinode_verify.part.0+0xdb/0x7b0 [xfs], inode 0x119 dinode
XFS (sda4): Unmount and run xfs_repair
XFS (sda4): First 128 bytes of corrupted metadata buffer:
00000000: 49 4e 81 a4 03 02 00 00 00 00 00 00 00 00 00 00  IN..............
00000010: 00 00 00 01 00 00 00 00 00 90 57 54 54 1a 4c 68  ..........WTT.Lh
00000020: 81 f9 7d e1 6d ee 16 00 34 bd 7d e1 6d ee 16 00  ..}.m...4.}.m...
00000030: 34 bd 7d e1 6d ee 16 00 00 00 00 00 00 00 00 00  4.}.m...........
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000050: 00 00 00 02 00 00 00 00 00 00 00 00 96 80 f3 ab  ................
00000060: ff ff ff ff da 57 7b 11 00 00 00 00 00 00 00 03  .....W{.........
00000070: 00 00 00 01 00 00 00 10 00 00 00 00 00 00 00 08  ................
XFS (sda4): Quotacheck: Unsuccessful (Error -117): Disabling quotas.

The dinode verifier decided that the inode was corrupt, which causes
iget to return with EFSCORRUPTED.  Since this happened during
quotacheck, it is obvious that the kernel aborted the inode walk on
account of the corruption error and disabled quotas.  Unfortunately, we
neglect to purge the dquot cache before doing that, which is how the
dquots leaked.

The problems started 10 years ago in commit b84a3a, when the dquot lists
were converted to a radix tree, but the error handling behavior was not
correctly preserved -- in that commit, if the bulkstat failed and
usrquota was enabled, the bulkstat failure code would be overwritten by
the result of flushing all the dquots to disk.  As long as that
succeeds, we'd continue the quota mount as if everything were ok, but
instead we're now operating with a corrupt inode and incorrect quota
usage counts.  I didn't notice this bug in 2019 when I wrote commit
ebd126a, which changed quotacheck to skip the dqflush when the scan
doesn't complete due to inode walk failures.

Introduced-by: b84a3a9675 ("xfs: remove the per-filesystem list of dquots")
Fixes: ebd126a651 ("xfs: convert quotacheck to use the new iwalk functions")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2022-05-27 10:21:43 +10:00

1916 lines
45 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_iwalk.h"
#include "xfs_quota.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_trans.h"
#include "xfs_trans_space.h"
#include "xfs_qm.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_error.h"
#include "xfs_ag.h"
#include "xfs_ialloc.h"
#include "xfs_log_priv.h"
/*
* The global quota manager. There is only one of these for the entire
* system, _not_ one per file system. XQM keeps track of the overall
* quota functionality, including maintaining the freelist and hash
* tables of dquots.
*/
STATIC int xfs_qm_init_quotainos(struct xfs_mount *mp);
STATIC int xfs_qm_init_quotainfo(struct xfs_mount *mp);
STATIC void xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
STATIC void xfs_qm_dqfree_one(struct xfs_dquot *dqp);
/*
* We use the batch lookup interface to iterate over the dquots as it
* currently is the only interface into the radix tree code that allows
* fuzzy lookups instead of exact matches. Holding the lock over multiple
* operations is fine as all callers are used either during mount/umount
* or quotaoff.
*/
#define XFS_DQ_LOOKUP_BATCH 32
STATIC int
xfs_qm_dquot_walk(
struct xfs_mount *mp,
xfs_dqtype_t type,
int (*execute)(struct xfs_dquot *dqp, void *data),
void *data)
{
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
uint32_t next_index;
int last_error = 0;
int skipped;
int nr_found;
restart:
skipped = 0;
next_index = 0;
nr_found = 0;
while (1) {
struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
int error = 0;
int i;
mutex_lock(&qi->qi_tree_lock);
nr_found = radix_tree_gang_lookup(tree, (void **)batch,
next_index, XFS_DQ_LOOKUP_BATCH);
if (!nr_found) {
mutex_unlock(&qi->qi_tree_lock);
break;
}
for (i = 0; i < nr_found; i++) {
struct xfs_dquot *dqp = batch[i];
next_index = dqp->q_id + 1;
error = execute(batch[i], data);
if (error == -EAGAIN) {
skipped++;
continue;
}
if (error && last_error != -EFSCORRUPTED)
last_error = error;
}
mutex_unlock(&qi->qi_tree_lock);
/* bail out if the filesystem is corrupted. */
if (last_error == -EFSCORRUPTED) {
skipped = 0;
break;
}
/* we're done if id overflows back to zero */
if (!next_index)
break;
}
if (skipped) {
delay(1);
goto restart;
}
return last_error;
}
/*
* Purge a dquot from all tracking data structures and free it.
*/
STATIC int
xfs_qm_dqpurge(
struct xfs_dquot *dqp,
void *data)
{
struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
int error = -EAGAIN;
xfs_dqlock(dqp);
if ((dqp->q_flags & XFS_DQFLAG_FREEING) || dqp->q_nrefs != 0)
goto out_unlock;
dqp->q_flags |= XFS_DQFLAG_FREEING;
xfs_dqflock(dqp);
/*
* If we are turning this type of quotas off, we don't care
* about the dirty metadata sitting in this dquot. OTOH, if
* we're unmounting, we do care, so we flush it and wait.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
struct xfs_buf *bp = NULL;
/*
* We don't care about getting disk errors here. We need
* to purge this dquot anyway, so we go ahead regardless.
*/
error = xfs_qm_dqflush(dqp, &bp);
if (!error) {
error = xfs_bwrite(bp);
xfs_buf_relse(bp);
} else if (error == -EAGAIN) {
dqp->q_flags &= ~XFS_DQFLAG_FREEING;
goto out_unlock;
}
xfs_dqflock(dqp);
}
ASSERT(atomic_read(&dqp->q_pincount) == 0);
ASSERT(xlog_is_shutdown(dqp->q_logitem.qli_item.li_log) ||
!test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
qi->qi_dquots--;
/*
* We move dquots to the freelist as soon as their reference count
* hits zero, so it really should be on the freelist here.
*/
ASSERT(!list_empty(&dqp->q_lru));
list_lru_del(&qi->qi_lru, &dqp->q_lru);
XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
xfs_qm_dqdestroy(dqp);
return 0;
out_unlock:
xfs_dqunlock(dqp);
return error;
}
/*
* Purge the dquot cache.
*/
static void
xfs_qm_dqpurge_all(
struct xfs_mount *mp)
{
xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_dqpurge, NULL);
xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_dqpurge, NULL);
xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_dqpurge, NULL);
}
/*
* Just destroy the quotainfo structure.
*/
void
xfs_qm_unmount(
struct xfs_mount *mp)
{
if (mp->m_quotainfo) {
xfs_qm_dqpurge_all(mp);
xfs_qm_destroy_quotainfo(mp);
}
}
/*
* Called from the vfsops layer.
*/
void
xfs_qm_unmount_quotas(
xfs_mount_t *mp)
{
/*
* Release the dquots that root inode, et al might be holding,
* before we flush quotas and blow away the quotainfo structure.
*/
ASSERT(mp->m_rootip);
xfs_qm_dqdetach(mp->m_rootip);
if (mp->m_rbmip)
xfs_qm_dqdetach(mp->m_rbmip);
if (mp->m_rsumip)
xfs_qm_dqdetach(mp->m_rsumip);
/*
* Release the quota inodes.
*/
if (mp->m_quotainfo) {
if (mp->m_quotainfo->qi_uquotaip) {
xfs_irele(mp->m_quotainfo->qi_uquotaip);
mp->m_quotainfo->qi_uquotaip = NULL;
}
if (mp->m_quotainfo->qi_gquotaip) {
xfs_irele(mp->m_quotainfo->qi_gquotaip);
mp->m_quotainfo->qi_gquotaip = NULL;
}
if (mp->m_quotainfo->qi_pquotaip) {
xfs_irele(mp->m_quotainfo->qi_pquotaip);
mp->m_quotainfo->qi_pquotaip = NULL;
}
}
}
STATIC int
xfs_qm_dqattach_one(
struct xfs_inode *ip,
xfs_dqtype_t type,
bool doalloc,
struct xfs_dquot **IO_idqpp)
{
struct xfs_dquot *dqp;
int error;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
error = 0;
/*
* See if we already have it in the inode itself. IO_idqpp is &i_udquot
* or &i_gdquot. This made the code look weird, but made the logic a lot
* simpler.
*/
dqp = *IO_idqpp;
if (dqp) {
trace_xfs_dqattach_found(dqp);
return 0;
}
/*
* Find the dquot from somewhere. This bumps the reference count of
* dquot and returns it locked. This can return ENOENT if dquot didn't
* exist on disk and we didn't ask it to allocate; ESRCH if quotas got
* turned off suddenly.
*/
error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
if (error)
return error;
trace_xfs_dqattach_get(dqp);
/*
* dqget may have dropped and re-acquired the ilock, but it guarantees
* that the dquot returned is the one that should go in the inode.
*/
*IO_idqpp = dqp;
xfs_dqunlock(dqp);
return 0;
}
static bool
xfs_qm_need_dqattach(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
if (!XFS_IS_QUOTA_ON(mp))
return false;
if (!XFS_NOT_DQATTACHED(mp, ip))
return false;
if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
return false;
return true;
}
/*
* Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
* into account.
* If @doalloc is true, the dquot(s) will be allocated if needed.
* Inode may get unlocked and relocked in here, and the caller must deal with
* the consequences.
*/
int
xfs_qm_dqattach_locked(
xfs_inode_t *ip,
bool doalloc)
{
xfs_mount_t *mp = ip->i_mount;
int error = 0;
if (!xfs_qm_need_dqattach(ip))
return 0;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_USER,
doalloc, &ip->i_udquot);
if (error)
goto done;
ASSERT(ip->i_udquot);
}
if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_GROUP,
doalloc, &ip->i_gdquot);
if (error)
goto done;
ASSERT(ip->i_gdquot);
}
if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_PROJ,
doalloc, &ip->i_pdquot);
if (error)
goto done;
ASSERT(ip->i_pdquot);
}
done:
/*
* Don't worry about the dquots that we may have attached before any
* error - they'll get detached later if it has not already been done.
*/
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
return error;
}
int
xfs_qm_dqattach(
struct xfs_inode *ip)
{
int error;
if (!xfs_qm_need_dqattach(ip))
return 0;
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_qm_dqattach_locked(ip, false);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* Release dquots (and their references) if any.
* The inode should be locked EXCL except when this's called by
* xfs_ireclaim.
*/
void
xfs_qm_dqdetach(
xfs_inode_t *ip)
{
if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
return;
trace_xfs_dquot_dqdetach(ip);
ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
if (ip->i_udquot) {
xfs_qm_dqrele(ip->i_udquot);
ip->i_udquot = NULL;
}
if (ip->i_gdquot) {
xfs_qm_dqrele(ip->i_gdquot);
ip->i_gdquot = NULL;
}
if (ip->i_pdquot) {
xfs_qm_dqrele(ip->i_pdquot);
ip->i_pdquot = NULL;
}
}
struct xfs_qm_isolate {
struct list_head buffers;
struct list_head dispose;
};
static enum lru_status
xfs_qm_dquot_isolate(
struct list_head *item,
struct list_lru_one *lru,
spinlock_t *lru_lock,
void *arg)
__releases(lru_lock) __acquires(lru_lock)
{
struct xfs_dquot *dqp = container_of(item,
struct xfs_dquot, q_lru);
struct xfs_qm_isolate *isol = arg;
if (!xfs_dqlock_nowait(dqp))
goto out_miss_busy;
/*
* This dquot has acquired a reference in the meantime remove it from
* the freelist and try again.
*/
if (dqp->q_nrefs) {
xfs_dqunlock(dqp);
XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
trace_xfs_dqreclaim_want(dqp);
list_lru_isolate(lru, &dqp->q_lru);
XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
return LRU_REMOVED;
}
/*
* If the dquot is dirty, flush it. If it's already being flushed, just
* skip it so there is time for the IO to complete before we try to
* reclaim it again on the next LRU pass.
*/
if (!xfs_dqflock_nowait(dqp)) {
xfs_dqunlock(dqp);
goto out_miss_busy;
}
if (XFS_DQ_IS_DIRTY(dqp)) {
struct xfs_buf *bp = NULL;
int error;
trace_xfs_dqreclaim_dirty(dqp);
/* we have to drop the LRU lock to flush the dquot */
spin_unlock(lru_lock);
error = xfs_qm_dqflush(dqp, &bp);
if (error)
goto out_unlock_dirty;
xfs_buf_delwri_queue(bp, &isol->buffers);
xfs_buf_relse(bp);
goto out_unlock_dirty;
}
xfs_dqfunlock(dqp);
/*
* Prevent lookups now that we are past the point of no return.
*/
dqp->q_flags |= XFS_DQFLAG_FREEING;
xfs_dqunlock(dqp);
ASSERT(dqp->q_nrefs == 0);
list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
trace_xfs_dqreclaim_done(dqp);
XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
return LRU_REMOVED;
out_miss_busy:
trace_xfs_dqreclaim_busy(dqp);
XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
return LRU_SKIP;
out_unlock_dirty:
trace_xfs_dqreclaim_busy(dqp);
XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
xfs_dqunlock(dqp);
spin_lock(lru_lock);
return LRU_RETRY;
}
static unsigned long
xfs_qm_shrink_scan(
struct shrinker *shrink,
struct shrink_control *sc)
{
struct xfs_quotainfo *qi = container_of(shrink,
struct xfs_quotainfo, qi_shrinker);
struct xfs_qm_isolate isol;
unsigned long freed;
int error;
if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
return 0;
INIT_LIST_HEAD(&isol.buffers);
INIT_LIST_HEAD(&isol.dispose);
freed = list_lru_shrink_walk(&qi->qi_lru, sc,
xfs_qm_dquot_isolate, &isol);
error = xfs_buf_delwri_submit(&isol.buffers);
if (error)
xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
while (!list_empty(&isol.dispose)) {
struct xfs_dquot *dqp;
dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
list_del_init(&dqp->q_lru);
xfs_qm_dqfree_one(dqp);
}
return freed;
}
static unsigned long
xfs_qm_shrink_count(
struct shrinker *shrink,
struct shrink_control *sc)
{
struct xfs_quotainfo *qi = container_of(shrink,
struct xfs_quotainfo, qi_shrinker);
return list_lru_shrink_count(&qi->qi_lru, sc);
}
STATIC void
xfs_qm_set_defquota(
struct xfs_mount *mp,
xfs_dqtype_t type,
struct xfs_quotainfo *qinf)
{
struct xfs_dquot *dqp;
struct xfs_def_quota *defq;
int error;
error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
if (error)
return;
defq = xfs_get_defquota(qinf, xfs_dquot_type(dqp));
/*
* Timers and warnings have been already set, let's just set the
* default limits for this quota type
*/
defq->blk.hard = dqp->q_blk.hardlimit;
defq->blk.soft = dqp->q_blk.softlimit;
defq->ino.hard = dqp->q_ino.hardlimit;
defq->ino.soft = dqp->q_ino.softlimit;
defq->rtb.hard = dqp->q_rtb.hardlimit;
defq->rtb.soft = dqp->q_rtb.softlimit;
xfs_qm_dqdestroy(dqp);
}
/* Initialize quota time limits from the root dquot. */
static void
xfs_qm_init_timelimits(
struct xfs_mount *mp,
xfs_dqtype_t type)
{
struct xfs_quotainfo *qinf = mp->m_quotainfo;
struct xfs_def_quota *defq;
struct xfs_dquot *dqp;
int error;
defq = xfs_get_defquota(qinf, type);
defq->blk.time = XFS_QM_BTIMELIMIT;
defq->ino.time = XFS_QM_ITIMELIMIT;
defq->rtb.time = XFS_QM_RTBTIMELIMIT;
/*
* We try to get the limits from the superuser's limits fields.
* This is quite hacky, but it is standard quota practice.
*
* Since we may not have done a quotacheck by this point, just read
* the dquot without attaching it to any hashtables or lists.
*/
error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
if (error)
return;
/*
* The warnings and timers set the grace period given to
* a user or group before he or she can not perform any
* more writing. If it is zero, a default is used.
*/
if (dqp->q_blk.timer)
defq->blk.time = dqp->q_blk.timer;
if (dqp->q_ino.timer)
defq->ino.time = dqp->q_ino.timer;
if (dqp->q_rtb.timer)
defq->rtb.time = dqp->q_rtb.timer;
xfs_qm_dqdestroy(dqp);
}
/*
* This initializes all the quota information that's kept in the
* mount structure
*/
STATIC int
xfs_qm_init_quotainfo(
struct xfs_mount *mp)
{
struct xfs_quotainfo *qinf;
int error;
ASSERT(XFS_IS_QUOTA_ON(mp));
qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
error = list_lru_init(&qinf->qi_lru);
if (error)
goto out_free_qinf;
/*
* See if quotainodes are setup, and if not, allocate them,
* and change the superblock accordingly.
*/
error = xfs_qm_init_quotainos(mp);
if (error)
goto out_free_lru;
INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
mutex_init(&qinf->qi_tree_lock);
/* mutex used to serialize quotaoffs */
mutex_init(&qinf->qi_quotaofflock);
/* Precalc some constants */
qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
if (xfs_has_bigtime(mp)) {
qinf->qi_expiry_min =
xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MIN);
qinf->qi_expiry_max =
xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MAX);
} else {
qinf->qi_expiry_min = XFS_DQ_LEGACY_EXPIRY_MIN;
qinf->qi_expiry_max = XFS_DQ_LEGACY_EXPIRY_MAX;
}
trace_xfs_quota_expiry_range(mp, qinf->qi_expiry_min,
qinf->qi_expiry_max);
mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
xfs_qm_init_timelimits(mp, XFS_DQTYPE_USER);
xfs_qm_init_timelimits(mp, XFS_DQTYPE_GROUP);
xfs_qm_init_timelimits(mp, XFS_DQTYPE_PROJ);
if (XFS_IS_UQUOTA_ON(mp))
xfs_qm_set_defquota(mp, XFS_DQTYPE_USER, qinf);
if (XFS_IS_GQUOTA_ON(mp))
xfs_qm_set_defquota(mp, XFS_DQTYPE_GROUP, qinf);
if (XFS_IS_PQUOTA_ON(mp))
xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf);
qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
error = register_shrinker(&qinf->qi_shrinker);
if (error)
goto out_free_inos;
return 0;
out_free_inos:
mutex_destroy(&qinf->qi_quotaofflock);
mutex_destroy(&qinf->qi_tree_lock);
xfs_qm_destroy_quotainos(qinf);
out_free_lru:
list_lru_destroy(&qinf->qi_lru);
out_free_qinf:
kmem_free(qinf);
mp->m_quotainfo = NULL;
return error;
}
/*
* Gets called when unmounting a filesystem or when all quotas get
* turned off.
* This purges the quota inodes, destroys locks and frees itself.
*/
void
xfs_qm_destroy_quotainfo(
struct xfs_mount *mp)
{
struct xfs_quotainfo *qi;
qi = mp->m_quotainfo;
ASSERT(qi != NULL);
unregister_shrinker(&qi->qi_shrinker);
list_lru_destroy(&qi->qi_lru);
xfs_qm_destroy_quotainos(qi);
mutex_destroy(&qi->qi_tree_lock);
mutex_destroy(&qi->qi_quotaofflock);
kmem_free(qi);
mp->m_quotainfo = NULL;
}
/*
* Create an inode and return with a reference already taken, but unlocked
* This is how we create quota inodes
*/
STATIC int
xfs_qm_qino_alloc(
struct xfs_mount *mp,
struct xfs_inode **ipp,
unsigned int flags)
{
struct xfs_trans *tp;
int error;
bool need_alloc = true;
*ipp = NULL;
/*
* With superblock that doesn't have separate pquotino, we
* share an inode between gquota and pquota. If the on-disk
* superblock has GQUOTA and the filesystem is now mounted
* with PQUOTA, just use sb_gquotino for sb_pquotino and
* vice-versa.
*/
if (!xfs_has_pquotino(mp) &&
(flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
xfs_ino_t ino = NULLFSINO;
if ((flags & XFS_QMOPT_PQUOTA) &&
(mp->m_sb.sb_gquotino != NULLFSINO)) {
ino = mp->m_sb.sb_gquotino;
if (XFS_IS_CORRUPT(mp,
mp->m_sb.sb_pquotino != NULLFSINO))
return -EFSCORRUPTED;
} else if ((flags & XFS_QMOPT_GQUOTA) &&
(mp->m_sb.sb_pquotino != NULLFSINO)) {
ino = mp->m_sb.sb_pquotino;
if (XFS_IS_CORRUPT(mp,
mp->m_sb.sb_gquotino != NULLFSINO))
return -EFSCORRUPTED;
}
if (ino != NULLFSINO) {
error = xfs_iget(mp, NULL, ino, 0, 0, ipp);
if (error)
return error;
mp->m_sb.sb_gquotino = NULLFSINO;
mp->m_sb.sb_pquotino = NULLFSINO;
need_alloc = false;
}
}
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
0, 0, &tp);
if (error)
return error;
if (need_alloc) {
xfs_ino_t ino;
error = xfs_dialloc(&tp, 0, S_IFREG, &ino);
if (!error)
error = xfs_init_new_inode(&init_user_ns, tp, NULL, ino,
S_IFREG, 1, 0, 0, false, ipp);
if (error) {
xfs_trans_cancel(tp);
return error;
}
}
/*
* Make the changes in the superblock, and log those too.
* sbfields arg may contain fields other than *QUOTINO;
* VERSIONNUM for example.
*/
spin_lock(&mp->m_sb_lock);
if (flags & XFS_QMOPT_SBVERSION) {
ASSERT(!xfs_has_quota(mp));
xfs_add_quota(mp);
mp->m_sb.sb_uquotino = NULLFSINO;
mp->m_sb.sb_gquotino = NULLFSINO;
mp->m_sb.sb_pquotino = NULLFSINO;
/* qflags will get updated fully _after_ quotacheck */
mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
}
if (flags & XFS_QMOPT_UQUOTA)
mp->m_sb.sb_uquotino = (*ipp)->i_ino;
else if (flags & XFS_QMOPT_GQUOTA)
mp->m_sb.sb_gquotino = (*ipp)->i_ino;
else
mp->m_sb.sb_pquotino = (*ipp)->i_ino;
spin_unlock(&mp->m_sb_lock);
xfs_log_sb(tp);
error = xfs_trans_commit(tp);
if (error) {
ASSERT(xfs_is_shutdown(mp));
xfs_alert(mp, "%s failed (error %d)!", __func__, error);
}
if (need_alloc)
xfs_finish_inode_setup(*ipp);
return error;
}
STATIC void
xfs_qm_reset_dqcounts(
struct xfs_mount *mp,
struct xfs_buf *bp,
xfs_dqid_t id,
xfs_dqtype_t type)
{
struct xfs_dqblk *dqb;
int j;
trace_xfs_reset_dqcounts(bp, _RET_IP_);
/*
* Reset all counters and timers. They'll be
* started afresh by xfs_qm_quotacheck.
*/
#ifdef DEBUG
j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
sizeof(struct xfs_dqblk);
ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
#endif
dqb = bp->b_addr;
for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
struct xfs_disk_dquot *ddq;
ddq = (struct xfs_disk_dquot *)&dqb[j];
/*
* Do a sanity check, and if needed, repair the dqblk. Don't
* output any warnings because it's perfectly possible to
* find uninitialised dquot blks. See comment in
* xfs_dquot_verify.
*/
if (xfs_dqblk_verify(mp, &dqb[j], id + j) ||
(dqb[j].dd_diskdq.d_type & XFS_DQTYPE_REC_MASK) != type)
xfs_dqblk_repair(mp, &dqb[j], id + j, type);
/*
* Reset type in case we are reusing group quota file for
* project quotas or vice versa
*/
ddq->d_type = type;
ddq->d_bcount = 0;
ddq->d_icount = 0;
ddq->d_rtbcount = 0;
/*
* dquot id 0 stores the default grace period and the maximum
* warning limit that were set by the administrator, so we
* should not reset them.
*/
if (ddq->d_id != 0) {
ddq->d_btimer = 0;
ddq->d_itimer = 0;
ddq->d_rtbtimer = 0;
ddq->d_bwarns = 0;
ddq->d_iwarns = 0;
ddq->d_rtbwarns = 0;
if (xfs_has_bigtime(mp))
ddq->d_type |= XFS_DQTYPE_BIGTIME;
}
if (xfs_has_crc(mp)) {
xfs_update_cksum((char *)&dqb[j],
sizeof(struct xfs_dqblk),
XFS_DQUOT_CRC_OFF);
}
}
}
STATIC int
xfs_qm_reset_dqcounts_all(
struct xfs_mount *mp,
xfs_dqid_t firstid,
xfs_fsblock_t bno,
xfs_filblks_t blkcnt,
xfs_dqtype_t type,
struct list_head *buffer_list)
{
struct xfs_buf *bp;
int error = 0;
ASSERT(blkcnt > 0);
/*
* Blkcnt arg can be a very big number, and might even be
* larger than the log itself. So, we have to break it up into
* manageable-sized transactions.
* Note that we don't start a permanent transaction here; we might
* not be able to get a log reservation for the whole thing up front,
* and we don't really care to either, because we just discard
* everything if we were to crash in the middle of this loop.
*/
while (blkcnt--) {
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, bno),
mp->m_quotainfo->qi_dqchunklen, 0, &bp,
&xfs_dquot_buf_ops);
/*
* CRC and validation errors will return a EFSCORRUPTED here. If
* this occurs, re-read without CRC validation so that we can
* repair the damage via xfs_qm_reset_dqcounts(). This process
* will leave a trace in the log indicating corruption has
* been detected.
*/
if (error == -EFSCORRUPTED) {
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, bno),
mp->m_quotainfo->qi_dqchunklen, 0, &bp,
NULL);
}
if (error)
break;
/*
* A corrupt buffer might not have a verifier attached, so
* make sure we have the correct one attached before writeback
* occurs.
*/
bp->b_ops = &xfs_dquot_buf_ops;
xfs_qm_reset_dqcounts(mp, bp, firstid, type);
xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
/* goto the next block. */
bno++;
firstid += mp->m_quotainfo->qi_dqperchunk;
}
return error;
}
/*
* Iterate over all allocated dquot blocks in this quota inode, zeroing all
* counters for every chunk of dquots that we find.
*/
STATIC int
xfs_qm_reset_dqcounts_buf(
struct xfs_mount *mp,
struct xfs_inode *qip,
xfs_dqtype_t type,
struct list_head *buffer_list)
{
struct xfs_bmbt_irec *map;
int i, nmaps; /* number of map entries */
int error; /* return value */
xfs_fileoff_t lblkno;
xfs_filblks_t maxlblkcnt;
xfs_dqid_t firstid;
xfs_fsblock_t rablkno;
xfs_filblks_t rablkcnt;
error = 0;
/*
* This looks racy, but we can't keep an inode lock across a
* trans_reserve. But, this gets called during quotacheck, and that
* happens only at mount time which is single threaded.
*/
if (qip->i_nblocks == 0)
return 0;
map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
lblkno = 0;
maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
do {
uint lock_mode;
nmaps = XFS_DQITER_MAP_SIZE;
/*
* We aren't changing the inode itself. Just changing
* some of its data. No new blocks are added here, and
* the inode is never added to the transaction.
*/
lock_mode = xfs_ilock_data_map_shared(qip);
error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
map, &nmaps, 0);
xfs_iunlock(qip, lock_mode);
if (error)
break;
ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
for (i = 0; i < nmaps; i++) {
ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
ASSERT(map[i].br_blockcount);
lblkno += map[i].br_blockcount;
if (map[i].br_startblock == HOLESTARTBLOCK)
continue;
firstid = (xfs_dqid_t) map[i].br_startoff *
mp->m_quotainfo->qi_dqperchunk;
/*
* Do a read-ahead on the next extent.
*/
if ((i+1 < nmaps) &&
(map[i+1].br_startblock != HOLESTARTBLOCK)) {
rablkcnt = map[i+1].br_blockcount;
rablkno = map[i+1].br_startblock;
while (rablkcnt--) {
xfs_buf_readahead(mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, rablkno),
mp->m_quotainfo->qi_dqchunklen,
&xfs_dquot_buf_ops);
rablkno++;
}
}
/*
* Iterate thru all the blks in the extent and
* reset the counters of all the dquots inside them.
*/
error = xfs_qm_reset_dqcounts_all(mp, firstid,
map[i].br_startblock,
map[i].br_blockcount,
type, buffer_list);
if (error)
goto out;
}
} while (nmaps > 0);
out:
kmem_free(map);
return error;
}
/*
* Called by dqusage_adjust in doing a quotacheck.
*
* Given the inode, and a dquot id this updates both the incore dqout as well
* as the buffer copy. This is so that once the quotacheck is done, we can
* just log all the buffers, as opposed to logging numerous updates to
* individual dquots.
*/
STATIC int
xfs_qm_quotacheck_dqadjust(
struct xfs_inode *ip,
xfs_dqtype_t type,
xfs_qcnt_t nblks,
xfs_qcnt_t rtblks)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_dquot *dqp;
xfs_dqid_t id;
int error;
id = xfs_qm_id_for_quotatype(ip, type);
error = xfs_qm_dqget(mp, id, type, true, &dqp);
if (error) {
/*
* Shouldn't be able to turn off quotas here.
*/
ASSERT(error != -ESRCH);
ASSERT(error != -ENOENT);
return error;
}
trace_xfs_dqadjust(dqp);
/*
* Adjust the inode count and the block count to reflect this inode's
* resource usage.
*/
dqp->q_ino.count++;
dqp->q_ino.reserved++;
if (nblks) {
dqp->q_blk.count += nblks;
dqp->q_blk.reserved += nblks;
}
if (rtblks) {
dqp->q_rtb.count += rtblks;
dqp->q_rtb.reserved += rtblks;
}
/*
* Set default limits, adjust timers (since we changed usages)
*
* There are no timers for the default values set in the root dquot.
*/
if (dqp->q_id) {
xfs_qm_adjust_dqlimits(dqp);
xfs_qm_adjust_dqtimers(dqp);
}
dqp->q_flags |= XFS_DQFLAG_DIRTY;
xfs_qm_dqput(dqp);
return 0;
}
/*
* callback routine supplied to bulkstat(). Given an inumber, find its
* dquots and update them to account for resources taken by that inode.
*/
/* ARGSUSED */
STATIC int
xfs_qm_dqusage_adjust(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_ino_t ino,
void *data)
{
struct xfs_inode *ip;
xfs_qcnt_t nblks;
xfs_filblks_t rtblks = 0; /* total rt blks */
int error;
ASSERT(XFS_IS_QUOTA_ON(mp));
/*
* rootino must have its resources accounted for, not so with the quota
* inodes.
*/
if (xfs_is_quota_inode(&mp->m_sb, ino))
return 0;
/*
* We don't _need_ to take the ilock EXCL here because quotacheck runs
* at mount time and therefore nobody will be racing chown/chproj.
*/
error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
if (error == -EINVAL || error == -ENOENT)
return 0;
if (error)
return error;
ASSERT(ip->i_delayed_blks == 0);
if (XFS_IS_REALTIME_INODE(ip)) {
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
if (error)
goto error0;
xfs_bmap_count_leaves(ifp, &rtblks);
}
nblks = (xfs_qcnt_t)ip->i_nblocks - rtblks;
/*
* Add the (disk blocks and inode) resources occupied by this
* inode to its dquots. We do this adjustment in the incore dquot,
* and also copy the changes to its buffer.
* We don't care about putting these changes in a transaction
* envelope because if we crash in the middle of a 'quotacheck'
* we have to start from the beginning anyway.
* Once we're done, we'll log all the dquot bufs.
*
* The *QUOTA_ON checks below may look pretty racy, but quotachecks
* and quotaoffs don't race. (Quotachecks happen at mount time only).
*/
if (XFS_IS_UQUOTA_ON(mp)) {
error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_USER, nblks,
rtblks);
if (error)
goto error0;
}
if (XFS_IS_GQUOTA_ON(mp)) {
error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_GROUP, nblks,
rtblks);
if (error)
goto error0;
}
if (XFS_IS_PQUOTA_ON(mp)) {
error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_PROJ, nblks,
rtblks);
if (error)
goto error0;
}
error0:
xfs_irele(ip);
return error;
}
STATIC int
xfs_qm_flush_one(
struct xfs_dquot *dqp,
void *data)
{
struct xfs_mount *mp = dqp->q_mount;
struct list_head *buffer_list = data;
struct xfs_buf *bp = NULL;
int error = 0;
xfs_dqlock(dqp);
if (dqp->q_flags & XFS_DQFLAG_FREEING)
goto out_unlock;
if (!XFS_DQ_IS_DIRTY(dqp))
goto out_unlock;
/*
* The only way the dquot is already flush locked by the time quotacheck
* gets here is if reclaim flushed it before the dqadjust walk dirtied
* it for the final time. Quotacheck collects all dquot bufs in the
* local delwri queue before dquots are dirtied, so reclaim can't have
* possibly queued it for I/O. The only way out is to push the buffer to
* cycle the flush lock.
*/
if (!xfs_dqflock_nowait(dqp)) {
/* buf is pinned in-core by delwri list */
bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
mp->m_quotainfo->qi_dqchunklen, 0);
if (!bp) {
error = -EINVAL;
goto out_unlock;
}
xfs_buf_unlock(bp);
xfs_buf_delwri_pushbuf(bp, buffer_list);
xfs_buf_rele(bp);
error = -EAGAIN;
goto out_unlock;
}
error = xfs_qm_dqflush(dqp, &bp);
if (error)
goto out_unlock;
xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
out_unlock:
xfs_dqunlock(dqp);
return error;
}
/*
* Walk thru all the filesystem inodes and construct a consistent view
* of the disk quota world. If the quotacheck fails, disable quotas.
*/
STATIC int
xfs_qm_quotacheck(
xfs_mount_t *mp)
{
int error, error2;
uint flags;
LIST_HEAD (buffer_list);
struct xfs_inode *uip = mp->m_quotainfo->qi_uquotaip;
struct xfs_inode *gip = mp->m_quotainfo->qi_gquotaip;
struct xfs_inode *pip = mp->m_quotainfo->qi_pquotaip;
flags = 0;
ASSERT(uip || gip || pip);
ASSERT(XFS_IS_QUOTA_ON(mp));
xfs_notice(mp, "Quotacheck needed: Please wait.");
/*
* First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
* their counters to zero. We need a clean slate.
* We don't log our changes till later.
*/
if (uip) {
error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_DQTYPE_USER,
&buffer_list);
if (error)
goto error_return;
flags |= XFS_UQUOTA_CHKD;
}
if (gip) {
error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_DQTYPE_GROUP,
&buffer_list);
if (error)
goto error_return;
flags |= XFS_GQUOTA_CHKD;
}
if (pip) {
error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_DQTYPE_PROJ,
&buffer_list);
if (error)
goto error_return;
flags |= XFS_PQUOTA_CHKD;
}
error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
NULL);
if (error) {
/*
* The inode walk may have partially populated the dquot
* caches. We must purge them before disabling quota and
* tearing down the quotainfo, or else the dquots will leak.
*/
xfs_qm_dqpurge_all(mp);
goto error_return;
}
/*
* We've made all the changes that we need to make incore. Flush them
* down to disk buffers if everything was updated successfully.
*/
if (XFS_IS_UQUOTA_ON(mp)) {
error = xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_flush_one,
&buffer_list);
}
if (XFS_IS_GQUOTA_ON(mp)) {
error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_flush_one,
&buffer_list);
if (!error)
error = error2;
}
if (XFS_IS_PQUOTA_ON(mp)) {
error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_flush_one,
&buffer_list);
if (!error)
error = error2;
}
error2 = xfs_buf_delwri_submit(&buffer_list);
if (!error)
error = error2;
/*
* We can get this error if we couldn't do a dquot allocation inside
* xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
* dirty dquots that might be cached, we just want to get rid of them
* and turn quotaoff. The dquots won't be attached to any of the inodes
* at this point (because we intentionally didn't in dqget_noattach).
*/
if (error) {
xfs_qm_dqpurge_all(mp);
goto error_return;
}
/*
* If one type of quotas is off, then it will lose its
* quotachecked status, since we won't be doing accounting for
* that type anymore.
*/
mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
mp->m_qflags |= flags;
error_return:
xfs_buf_delwri_cancel(&buffer_list);
if (error) {
xfs_warn(mp,
"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
error);
/*
* We must turn off quotas.
*/
ASSERT(mp->m_quotainfo != NULL);
xfs_qm_destroy_quotainfo(mp);
if (xfs_mount_reset_sbqflags(mp)) {
xfs_warn(mp,
"Quotacheck: Failed to reset quota flags.");
}
} else
xfs_notice(mp, "Quotacheck: Done.");
return error;
}
/*
* This is called from xfs_mountfs to start quotas and initialize all
* necessary data structures like quotainfo. This is also responsible for
* running a quotacheck as necessary. We are guaranteed that the superblock
* is consistently read in at this point.
*
* If we fail here, the mount will continue with quota turned off. We don't
* need to inidicate success or failure at all.
*/
void
xfs_qm_mount_quotas(
struct xfs_mount *mp)
{
int error = 0;
uint sbf;
/*
* If quotas on realtime volumes is not supported, we disable
* quotas immediately.
*/
if (mp->m_sb.sb_rextents) {
xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
mp->m_qflags = 0;
goto write_changes;
}
ASSERT(XFS_IS_QUOTA_ON(mp));
/*
* Allocate the quotainfo structure inside the mount struct, and
* create quotainode(s), and change/rev superblock if necessary.
*/
error = xfs_qm_init_quotainfo(mp);
if (error) {
/*
* We must turn off quotas.
*/
ASSERT(mp->m_quotainfo == NULL);
mp->m_qflags = 0;
goto write_changes;
}
/*
* If any of the quotas are not consistent, do a quotacheck.
*/
if (XFS_QM_NEED_QUOTACHECK(mp)) {
error = xfs_qm_quotacheck(mp);
if (error) {
/* Quotacheck failed and disabled quotas. */
return;
}
}
/*
* If one type of quotas is off, then it will lose its
* quotachecked status, since we won't be doing accounting for
* that type anymore.
*/
if (!XFS_IS_UQUOTA_ON(mp))
mp->m_qflags &= ~XFS_UQUOTA_CHKD;
if (!XFS_IS_GQUOTA_ON(mp))
mp->m_qflags &= ~XFS_GQUOTA_CHKD;
if (!XFS_IS_PQUOTA_ON(mp))
mp->m_qflags &= ~XFS_PQUOTA_CHKD;
write_changes:
/*
* We actually don't have to acquire the m_sb_lock at all.
* This can only be called from mount, and that's single threaded. XXX
*/
spin_lock(&mp->m_sb_lock);
sbf = mp->m_sb.sb_qflags;
mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
spin_unlock(&mp->m_sb_lock);
if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
if (xfs_sync_sb(mp, false)) {
/*
* We could only have been turning quotas off.
* We aren't in very good shape actually because
* the incore structures are convinced that quotas are
* off, but the on disk superblock doesn't know that !
*/
ASSERT(!(XFS_IS_QUOTA_ON(mp)));
xfs_alert(mp, "%s: Superblock update failed!",
__func__);
}
}
if (error) {
xfs_warn(mp, "Failed to initialize disk quotas.");
return;
}
}
/*
* This is called after the superblock has been read in and we're ready to
* iget the quota inodes.
*/
STATIC int
xfs_qm_init_quotainos(
xfs_mount_t *mp)
{
struct xfs_inode *uip = NULL;
struct xfs_inode *gip = NULL;
struct xfs_inode *pip = NULL;
int error;
uint flags = 0;
ASSERT(mp->m_quotainfo);
/*
* Get the uquota and gquota inodes
*/
if (xfs_has_quota(mp)) {
if (XFS_IS_UQUOTA_ON(mp) &&
mp->m_sb.sb_uquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_uquotino > 0);
error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
0, 0, &uip);
if (error)
return error;
}
if (XFS_IS_GQUOTA_ON(mp) &&
mp->m_sb.sb_gquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_gquotino > 0);
error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
0, 0, &gip);
if (error)
goto error_rele;
}
if (XFS_IS_PQUOTA_ON(mp) &&
mp->m_sb.sb_pquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_pquotino > 0);
error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
0, 0, &pip);
if (error)
goto error_rele;
}
} else {
flags |= XFS_QMOPT_SBVERSION;
}
/*
* Create the three inodes, if they don't exist already. The changes
* made above will get added to a transaction and logged in one of
* the qino_alloc calls below. If the device is readonly,
* temporarily switch to read-write to do this.
*/
if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
error = xfs_qm_qino_alloc(mp, &uip,
flags | XFS_QMOPT_UQUOTA);
if (error)
goto error_rele;
flags &= ~XFS_QMOPT_SBVERSION;
}
if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
error = xfs_qm_qino_alloc(mp, &gip,
flags | XFS_QMOPT_GQUOTA);
if (error)
goto error_rele;
flags &= ~XFS_QMOPT_SBVERSION;
}
if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
error = xfs_qm_qino_alloc(mp, &pip,
flags | XFS_QMOPT_PQUOTA);
if (error)
goto error_rele;
}
mp->m_quotainfo->qi_uquotaip = uip;
mp->m_quotainfo->qi_gquotaip = gip;
mp->m_quotainfo->qi_pquotaip = pip;
return 0;
error_rele:
if (uip)
xfs_irele(uip);
if (gip)
xfs_irele(gip);
if (pip)
xfs_irele(pip);
return error;
}
STATIC void
xfs_qm_destroy_quotainos(
struct xfs_quotainfo *qi)
{
if (qi->qi_uquotaip) {
xfs_irele(qi->qi_uquotaip);
qi->qi_uquotaip = NULL; /* paranoia */
}
if (qi->qi_gquotaip) {
xfs_irele(qi->qi_gquotaip);
qi->qi_gquotaip = NULL;
}
if (qi->qi_pquotaip) {
xfs_irele(qi->qi_pquotaip);
qi->qi_pquotaip = NULL;
}
}
STATIC void
xfs_qm_dqfree_one(
struct xfs_dquot *dqp)
{
struct xfs_mount *mp = dqp->q_mount;
struct xfs_quotainfo *qi = mp->m_quotainfo;
mutex_lock(&qi->qi_tree_lock);
radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
qi->qi_dquots--;
mutex_unlock(&qi->qi_tree_lock);
xfs_qm_dqdestroy(dqp);
}
/* --------------- utility functions for vnodeops ---------------- */
/*
* Given an inode, a uid, gid and prid make sure that we have
* allocated relevant dquot(s) on disk, and that we won't exceed inode
* quotas by creating this file.
* This also attaches dquot(s) to the given inode after locking it,
* and returns the dquots corresponding to the uid and/or gid.
*
* in : inode (unlocked)
* out : udquot, gdquot with references taken and unlocked
*/
int
xfs_qm_vop_dqalloc(
struct xfs_inode *ip,
kuid_t uid,
kgid_t gid,
prid_t prid,
uint flags,
struct xfs_dquot **O_udqpp,
struct xfs_dquot **O_gdqpp,
struct xfs_dquot **O_pdqpp)
{
struct xfs_mount *mp = ip->i_mount;
struct inode *inode = VFS_I(ip);
struct user_namespace *user_ns = inode->i_sb->s_user_ns;
struct xfs_dquot *uq = NULL;
struct xfs_dquot *gq = NULL;
struct xfs_dquot *pq = NULL;
int error;
uint lockflags;
if (!XFS_IS_QUOTA_ON(mp))
return 0;
lockflags = XFS_ILOCK_EXCL;
xfs_ilock(ip, lockflags);
if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
gid = inode->i_gid;
/*
* Attach the dquot(s) to this inode, doing a dquot allocation
* if necessary. The dquot(s) will not be locked.
*/
if (XFS_NOT_DQATTACHED(mp, ip)) {
error = xfs_qm_dqattach_locked(ip, true);
if (error) {
xfs_iunlock(ip, lockflags);
return error;
}
}
if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
ASSERT(O_udqpp);
if (!uid_eq(inode->i_uid, uid)) {
/*
* What we need is the dquot that has this uid, and
* if we send the inode to dqget, the uid of the inode
* takes priority over what's sent in the uid argument.
* We must unlock inode here before calling dqget if
* we're not sending the inode, because otherwise
* we'll deadlock by doing trans_reserve while
* holding ilock.
*/
xfs_iunlock(ip, lockflags);
error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
XFS_DQTYPE_USER, true, &uq);
if (error) {
ASSERT(error != -ENOENT);
return error;
}
/*
* Get the ilock in the right order.
*/
xfs_dqunlock(uq);
lockflags = XFS_ILOCK_SHARED;
xfs_ilock(ip, lockflags);
} else {
/*
* Take an extra reference, because we'll return
* this to caller
*/
ASSERT(ip->i_udquot);
uq = xfs_qm_dqhold(ip->i_udquot);
}
}
if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
ASSERT(O_gdqpp);
if (!gid_eq(inode->i_gid, gid)) {
xfs_iunlock(ip, lockflags);
error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
XFS_DQTYPE_GROUP, true, &gq);
if (error) {
ASSERT(error != -ENOENT);
goto error_rele;
}
xfs_dqunlock(gq);
lockflags = XFS_ILOCK_SHARED;
xfs_ilock(ip, lockflags);
} else {
ASSERT(ip->i_gdquot);
gq = xfs_qm_dqhold(ip->i_gdquot);
}
}
if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
ASSERT(O_pdqpp);
if (ip->i_projid != prid) {
xfs_iunlock(ip, lockflags);
error = xfs_qm_dqget(mp, prid,
XFS_DQTYPE_PROJ, true, &pq);
if (error) {
ASSERT(error != -ENOENT);
goto error_rele;
}
xfs_dqunlock(pq);
lockflags = XFS_ILOCK_SHARED;
xfs_ilock(ip, lockflags);
} else {
ASSERT(ip->i_pdquot);
pq = xfs_qm_dqhold(ip->i_pdquot);
}
}
trace_xfs_dquot_dqalloc(ip);
xfs_iunlock(ip, lockflags);
if (O_udqpp)
*O_udqpp = uq;
else
xfs_qm_dqrele(uq);
if (O_gdqpp)
*O_gdqpp = gq;
else
xfs_qm_dqrele(gq);
if (O_pdqpp)
*O_pdqpp = pq;
else
xfs_qm_dqrele(pq);
return 0;
error_rele:
xfs_qm_dqrele(gq);
xfs_qm_dqrele(uq);
return error;
}
/*
* Actually transfer ownership, and do dquot modifications.
* These were already reserved.
*/
struct xfs_dquot *
xfs_qm_vop_chown(
struct xfs_trans *tp,
struct xfs_inode *ip,
struct xfs_dquot **IO_olddq,
struct xfs_dquot *newdq)
{
struct xfs_dquot *prevdq;
uint bfield = XFS_IS_REALTIME_INODE(ip) ?
XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(XFS_IS_QUOTA_ON(ip->i_mount));
/* old dquot */
prevdq = *IO_olddq;
ASSERT(prevdq);
ASSERT(prevdq != newdq);
xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_nblocks));
xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
/* the sparkling new dquot */
xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_nblocks);
xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
/*
* Back when we made quota reservations for the chown, we reserved the
* ondisk blocks + delalloc blocks with the new dquot. Now that we've
* switched the dquots, decrease the new dquot's block reservation
* (having already bumped up the real counter) so that we don't have
* any reservation to give back when we commit.
*/
xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_RES_BLKS,
-ip->i_delayed_blks);
/*
* Give the incore reservation for delalloc blocks back to the old
* dquot. We don't normally handle delalloc quota reservations
* transactionally, so just lock the dquot and subtract from the
* reservation. Dirty the transaction because it's too late to turn
* back now.
*/
tp->t_flags |= XFS_TRANS_DIRTY;
xfs_dqlock(prevdq);
ASSERT(prevdq->q_blk.reserved >= ip->i_delayed_blks);
prevdq->q_blk.reserved -= ip->i_delayed_blks;
xfs_dqunlock(prevdq);
/*
* Take an extra reference, because the inode is going to keep
* this dquot pointer even after the trans_commit.
*/
*IO_olddq = xfs_qm_dqhold(newdq);
return prevdq;
}
int
xfs_qm_vop_rename_dqattach(
struct xfs_inode **i_tab)
{
struct xfs_mount *mp = i_tab[0]->i_mount;
int i;
if (!XFS_IS_QUOTA_ON(mp))
return 0;
for (i = 0; (i < 4 && i_tab[i]); i++) {
struct xfs_inode *ip = i_tab[i];
int error;
/*
* Watch out for duplicate entries in the table.
*/
if (i == 0 || ip != i_tab[i-1]) {
if (XFS_NOT_DQATTACHED(mp, ip)) {
error = xfs_qm_dqattach(ip);
if (error)
return error;
}
}
}
return 0;
}
void
xfs_qm_vop_create_dqattach(
struct xfs_trans *tp,
struct xfs_inode *ip,
struct xfs_dquot *udqp,
struct xfs_dquot *gdqp,
struct xfs_dquot *pdqp)
{
struct xfs_mount *mp = tp->t_mountp;
if (!XFS_IS_QUOTA_ON(mp))
return;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (udqp && XFS_IS_UQUOTA_ON(mp)) {
ASSERT(ip->i_udquot == NULL);
ASSERT(i_uid_read(VFS_I(ip)) == udqp->q_id);
ip->i_udquot = xfs_qm_dqhold(udqp);
xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
}
if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
ASSERT(ip->i_gdquot == NULL);
ASSERT(i_gid_read(VFS_I(ip)) == gdqp->q_id);
ip->i_gdquot = xfs_qm_dqhold(gdqp);
xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
}
if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
ASSERT(ip->i_pdquot == NULL);
ASSERT(ip->i_projid == pdqp->q_id);
ip->i_pdquot = xfs_qm_dqhold(pdqp);
xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
}
}
/* Decide if this inode's dquot is near an enforcement boundary. */
bool
xfs_inode_near_dquot_enforcement(
struct xfs_inode *ip,
xfs_dqtype_t type)
{
struct xfs_dquot *dqp;
int64_t freesp;
/* We only care for quotas that are enabled and enforced. */
dqp = xfs_inode_dquot(ip, type);
if (!dqp || !xfs_dquot_is_enforced(dqp))
return false;
if (xfs_dquot_res_over_limits(&dqp->q_ino) ||
xfs_dquot_res_over_limits(&dqp->q_rtb))
return true;
/* For space on the data device, check the various thresholds. */
if (!dqp->q_prealloc_hi_wmark)
return false;
if (dqp->q_blk.reserved < dqp->q_prealloc_lo_wmark)
return false;
if (dqp->q_blk.reserved >= dqp->q_prealloc_hi_wmark)
return true;
freesp = dqp->q_prealloc_hi_wmark - dqp->q_blk.reserved;
if (freesp < dqp->q_low_space[XFS_QLOWSP_5_PCNT])
return true;
return false;
}