// 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"
#include "xfs_health.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;
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_obj(&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;
xfs_assert_ilocked(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;
xfs_assert_ilocked(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.
*/
xfs_assert_ilocked(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;
/*
* If something else is freeing this dquot and hasn't yet removed it
* from the LRU, leave it for the freeing task to complete the freeing
* process rather than risk it being free from under us here.
*/
if (dqp->q_flags & XFS_DQFLAG_FREEING)
goto out_miss_unlock;
/*
* 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))
goto out_miss_unlock;
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_unlock:
xfs_dqunlock(dqp);
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 = shrink->private_data;
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 = shrink->private_data;
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 = kzalloc(sizeof(struct xfs_quotainfo),
GFP_KERNEL | __GFP_NOFAIL);
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_KERNEL);
INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_KERNEL);
INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_KERNEL);
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 = shrinker_alloc(SHRINKER_NUMA_AWARE, "xfs-qm:%s",
mp->m_super->s_id);
if (!qinf->qi_shrinker) {
error = -ENOMEM;
goto out_free_inos;
}
qinf->qi_shrinker->count_objects = xfs_qm_shrink_count;
qinf->qi_shrinker->scan_objects = xfs_qm_shrink_scan;
qinf->qi_shrinker->private_data = qinf;
shrinker_register(qinf->qi_shrinker);
xfs_hooks_init(&qinf->qi_mod_ino_dqtrx_hooks);
xfs_hooks_init(&qinf->qi_apply_dqtrx_hooks);
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:
kfree(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);
shrinker_free(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);
kfree(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)) {
xfs_fs_mark_sick(mp, XFS_SICK_FS_PQUOTA);
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)) {
xfs_fs_mark_sick(mp, XFS_SICK_FS_GQUOTA);
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) {
struct xfs_icreate_args args = {
.mode = S_IFREG,
.flags = XFS_ICREATE_UNLINKABLE,
};
xfs_ino_t ino;
error = xfs_dialloc(&tp, &args, &ino);
if (!error)
error = xfs_icreate(tp, ino, &args, 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_iunlock(*ipp, XFS_ILOCK_EXCL);
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 = kmalloc(XFS_DQITER_MAP_SIZE * sizeof(*map),
GFP_KERNEL | __GFP_NOFAIL);
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:
kfree(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;
/*
* Reload the incore unlinked list to avoid failure in inodegc.
* Use an unlocked check here because unrecovered unlinked inodes
* should be somewhat rare.
*/
if (xfs_inode_unlinked_incomplete(ip)) {
error = xfs_inode_reload_unlinked(ip);
if (error) {
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
goto error0;
}
}
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;
xfs_iflags_clear(ip, XFS_IQUOTAUNCHECKED);
/*
* 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 */
error = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
mp->m_quotainfo->qi_dqchunklen, 0, &bp);
if (error)
goto out_unlock;
if (!(bp->b_flags & _XBF_DELWRI_Q)) {
error = -EAGAIN;
xfs_buf_relse(bp);
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;
}
xfs_set_quotacheck_running(mp);
error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
NULL);
xfs_clear_quotacheck_running(mp);
/*
* On 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.
*/
if (error)
goto error_purge;
/*
* 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)
goto error_purge;
/*
* 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.");
}
xfs_fs_mark_sick(mp, XFS_SICK_FS_QUOTACHECK);
} else {
xfs_notice(mp, "Quotacheck: Done.");
xfs_fs_mark_healthy(mp, XFS_SICK_FS_QUOTACHECK);
}
return error;
error_purge:
/*
* On error, we may have inodes queued for inactivation. This may try
* to attach dquots to the inode before running cleanup operations on
* the inode and this can race with the xfs_qm_destroy_quotainfo() call
* below that frees mp->m_quotainfo. To avoid this race, flush all the
* pending inodegc operations before we purge the dquots from memory,
* ensuring that background inactivation is idle whilst we turn off
* quotas.
*/
xfs_inodegc_flush(mp);
xfs_qm_dqpurge_all(mp);
goto error_return;
}
/*
* 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;
}
}
/*
* Load the inode for a given type of quota, assuming that the sb fields have
* been sorted out. This is not true when switching quota types on a V4
* filesystem, so do not use this function for that.
*
* Returns -ENOENT if the quota inode field is NULLFSINO; 0 and an inode on
* success; or a negative errno.
*/
int
xfs_qm_qino_load(
struct xfs_mount *mp,
xfs_dqtype_t type,
struct xfs_inode **ipp)
{
xfs_ino_t ino = NULLFSINO;
switch (type) {
case XFS_DQTYPE_USER:
ino = mp->m_sb.sb_uquotino;
break;
case XFS_DQTYPE_GROUP:
ino = mp->m_sb.sb_gquotino;
break;
case XFS_DQTYPE_PROJ:
ino = mp->m_sb.sb_pquotino;
break;
default:
ASSERT(0);
return -EFSCORRUPTED;
}
if (ino == NULLFSINO)
return -ENOENT;
return xfs_iget(mp, NULL, ino, 0, 0, ipp);
}
/*
* 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_qm_qino_load(mp, XFS_DQTYPE_USER, &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_qm_qino_load(mp, XFS_DQTYPE_GROUP, &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_qm_qino_load(mp, XFS_DQTYPE_PROJ, &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;
xfs_assert_ilocked(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_ino_dquot(tp, ip, prevdq, bfield, -(ip->i_nblocks));
xfs_trans_mod_ino_dquot(tp, ip, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
/* the sparkling new dquot */
xfs_trans_mod_ino_dquot(tp, ip, newdq, bfield, ip->i_nblocks);
xfs_trans_mod_ino_dquot(tp, ip, 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;
xfs_assert_ilocked(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);
}
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);
}
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_byino(tp, ip, 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;
}
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