/*
* Given a dquot id and type, read and initialize a dquot from the on-disk
* metadata. This function is only for use during quota initialization so
* it ignores the dquot cache assuming that the dquot shrinker isn't set up.
* The caller is responsible for _qm_dqdestroy'ing the returned dquot.
*/
int
xfs_qm_dqget_uncached(
struct xfs_mount *mp,
xfs_dqid_t id,
uint type,
struct xfs_dquot **dqpp)
{
int error;
error = xfs_qm_dqget_checks(mp, type);
if (error)
return error;
return xfs_qm_dqread(mp, id, type, 0, dqpp);
}
/*
* Given the file system, id, and type (UDQUOT/GDQUOT), return a a locked
* dquot, doing an allocation (if requested) as needed.
*/
int
xfs_qm_dqget(
struct xfs_mount *mp,
xfs_dqid_t id,
uint type,
bool can_alloc,
struct xfs_dquot **O_dqpp)
{
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
struct xfs_dquot *dqp;
int error;
error = xfs_qm_dqget_checks(mp, type);
if (error)
return error;
restart:
dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id);
if (dqp) {
*O_dqpp = dqp;
return 0;
}
error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp);
if (error)
return error;
error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
if (error) {
/*
* Duplicate found. Just throw away the new dquot and start
* over.
*/
xfs_qm_dqdestroy(dqp);
XFS_STATS_INC(mp, xs_qm_dquot_dups);
goto restart;
}
trace_xfs_dqget_miss(dqp);
*O_dqpp = dqp;
return 0;
}
/*
* This initializes all the quota information that's kept in the
* mount structure
*/
STATIC int
xfs_qm_init_quotainfo(
xfs_mount_t *mp)
{
xfs_quotainfo_t *qinf;
int error;
xfs_dquot_t *dqp;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
/*
* See if quotainodes are setup, and if not, allocate them,
* and change the superblock accordingly.
*/
if ((error = xfs_qm_init_quotainos(mp))) {
kmem_free(qinf);
mp->m_quotainfo = NULL;
return error;
}
INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
mutex_init(&qinf->qi_tree_lock);
INIT_LIST_HEAD(&qinf->qi_lru_list);
qinf->qi_lru_count = 0;
mutex_init(&qinf->qi_lru_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);
ASSERT(qinf->qi_dqchunklen);
qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
/*
* We try to get the limits from the superuser's limits fields.
* This is quite hacky, but it is standard quota practice.
*
* We look at the USR dquot with id == 0 first, but if user quotas
* are not enabled we goto the GRP dquot with id == 0.
* We don't really care to keep separate default limits for user
* and group quotas, at least not at this point.
*
* 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_dqread(mp, 0,
XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
(XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
XFS_DQ_PROJ),
XFS_QMOPT_DOWARN, &dqp);
if (!error) {
xfs_disk_dquot_t *ddqp = &dqp->q_core;
/*
* 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.
*/
qinf->qi_btimelimit = ddqp->d_btimer ?
be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
qinf->qi_itimelimit = ddqp->d_itimer ?
be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
qinf->qi_bwarnlimit = ddqp->d_bwarns ?
be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
qinf->qi_iwarnlimit = ddqp->d_iwarns ?
be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
xfs_qm_dqdestroy(dqp);
} else {
qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
}
qinf->qi_shrinker.shrink = xfs_qm_shake;
qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
register_shrinker(&qinf->qi_shrinker);
return 0;
}
/*
* allocate an incore dquot from the kernel heap,
* and fill its core with quota information kept on disk.
* If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
* if it wasn't already allocated.
*/
STATIC int
xfs_qm_idtodq(
xfs_mount_t *mp,
xfs_dqid_t id, /* gid or uid, depending on type */
uint type, /* UDQUOT or GDQUOT */
uint flags, /* DQALLOC, DQREPAIR */
xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */
{
xfs_dquot_t *dqp;
int error;
xfs_trans_t *tp;
int cancelflags=0;
dqp = xfs_qm_dqinit(mp, id, type);
tp = NULL;
if (flags & XFS_QMOPT_DQALLOC) {
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
if ((error = xfs_trans_reserve(tp,
XFS_QM_DQALLOC_SPACE_RES(mp),
XFS_WRITE_LOG_RES(mp) +
BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1 +
128,
0,
XFS_TRANS_PERM_LOG_RES,
XFS_WRITE_LOG_COUNT))) {
cancelflags = 0;
goto error0;
}
cancelflags = XFS_TRANS_RELEASE_LOG_RES;
}
/*
* Read it from disk; xfs_dqread() takes care of
* all the necessary initialization of dquot's fields (locks, etc)
*/
if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
/*
* This can happen if quotas got turned off (ESRCH),
* or if the dquot didn't exist on disk and we ask to
* allocate (ENOENT).
*/
xfs_dqtrace_entry(dqp, "DQREAD FAIL");
cancelflags |= XFS_TRANS_ABORT;
goto error0;
}
if (tp) {
if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES,
NULL)))
goto error1;
}
*O_dqpp = dqp;
return (0);
error0:
ASSERT(error);
if (tp)
xfs_trans_cancel(tp, cancelflags);
error1:
xfs_qm_dqdestroy(dqp);
*O_dqpp = NULL;
return (error);
}
/*
* Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
* a locked dquot, doing an allocation (if requested) as needed.
* When both an inode and an id are given, the inode's id takes precedence.
* That is, if the id changes while we don't hold the ilock inside this
* function, the new dquot is returned, not necessarily the one requested
* in the id argument.
*/
int
xfs_qm_dqget(
xfs_mount_t *mp,
xfs_inode_t *ip, /* locked inode (optional) */
xfs_dqid_t id, /* uid/projid/gid depending on type */
uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
{
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
struct xfs_dquot *dqp;
int error;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
(! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
(! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
return (ESRCH);
}
#ifdef DEBUG
if (xfs_do_dqerror) {
if ((xfs_dqerror_target == mp->m_ddev_targp) &&
(xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
xfs_debug(mp, "Returning error in dqget");
return (EIO);
}
}
ASSERT(type == XFS_DQ_USER ||
type == XFS_DQ_PROJ ||
type == XFS_DQ_GROUP);
if (ip) {
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(xfs_inode_dquot(ip, type) == NULL);
}
#endif
restart:
mutex_lock(&qi->qi_tree_lock);
dqp = radix_tree_lookup(tree, id);
if (dqp) {
xfs_dqlock(dqp);
if (dqp->dq_flags & XFS_DQ_FREEING) {
xfs_dqunlock(dqp);
mutex_unlock(&qi->qi_tree_lock);
trace_xfs_dqget_freeing(dqp);
delay(1);
goto restart;
}
dqp->q_nrefs++;
mutex_unlock(&qi->qi_tree_lock);
trace_xfs_dqget_hit(dqp);
XFS_STATS_INC(xs_qm_dqcachehits);
*O_dqpp = dqp;
return 0;
}
mutex_unlock(&qi->qi_tree_lock);
XFS_STATS_INC(xs_qm_dqcachemisses);
/*
* Dquot cache miss. We don't want to keep the inode lock across
* a (potential) disk read. Also we don't want to deal with the lock
* ordering between quotainode and this inode. OTOH, dropping the inode
* lock here means dealing with a chown that can happen before
* we re-acquire the lock.
*/
if (ip)
xfs_iunlock(ip, XFS_ILOCK_EXCL);
error = xfs_qm_dqread(mp, id, type, flags, &dqp);
if (ip)
xfs_ilock(ip, XFS_ILOCK_EXCL);
if (error)
return error;
if (ip) {
/*
* A dquot could be attached to this inode by now, since
* we had dropped the ilock.
*/
if (xfs_this_quota_on(mp, type)) {
struct xfs_dquot *dqp1;
dqp1 = xfs_inode_dquot(ip, type);
if (dqp1) {
xfs_qm_dqdestroy(dqp);
dqp = dqp1;
xfs_dqlock(dqp);
goto dqret;
}
} else {
/* inode stays locked on return */
xfs_qm_dqdestroy(dqp);
return XFS_ERROR(ESRCH);
}
}
mutex_lock(&qi->qi_tree_lock);
error = -radix_tree_insert(tree, id, dqp);
if (unlikely(error)) {
WARN_ON(error != EEXIST);
/*
* Duplicate found. Just throw away the new dquot and start
* over.
*/
mutex_unlock(&qi->qi_tree_lock);
trace_xfs_dqget_dup(dqp);
xfs_qm_dqdestroy(dqp);
XFS_STATS_INC(xs_qm_dquot_dups);
goto restart;
}
/*
* We return a locked dquot to the caller, with a reference taken
*/
xfs_dqlock(dqp);
dqp->q_nrefs = 1;
qi->qi_dquots++;
mutex_unlock(&qi->qi_tree_lock);
dqret:
ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
trace_xfs_dqget_miss(dqp);
*O_dqpp = dqp;
return (0);
}
/*
* Return the dquot for a given inode and type. If @can_alloc is true, then
* allocate blocks if needed. The inode's ILOCK must be held and it must not
* have already had an inode attached.
*/
int
xfs_qm_dqget_inode(
struct xfs_inode *ip,
uint type,
bool can_alloc,
struct xfs_dquot **O_dqpp)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
struct xfs_dquot *dqp;
xfs_dqid_t id;
int error;
error = xfs_qm_dqget_checks(mp, type);
if (error)
return error;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(xfs_inode_dquot(ip, type) == NULL);
id = xfs_qm_id_for_quotatype(ip, type);
restart:
dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id);
if (dqp) {
*O_dqpp = dqp;
return 0;
}
/*
* Dquot cache miss. We don't want to keep the inode lock across
* a (potential) disk read. Also we don't want to deal with the lock
* ordering between quotainode and this inode. OTOH, dropping the inode
* lock here means dealing with a chown that can happen before
* we re-acquire the lock.
*/
xfs_iunlock(ip, XFS_ILOCK_EXCL);
error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp);
xfs_ilock(ip, XFS_ILOCK_EXCL);
if (error)
return error;
/*
* A dquot could be attached to this inode by now, since we had
* dropped the ilock.
*/
if (xfs_this_quota_on(mp, type)) {
struct xfs_dquot *dqp1;
dqp1 = xfs_inode_dquot(ip, type);
if (dqp1) {
xfs_qm_dqdestroy(dqp);
dqp = dqp1;
xfs_dqlock(dqp);
goto dqret;
}
} else {
/* inode stays locked on return */
xfs_qm_dqdestroy(dqp);
return -ESRCH;
}
error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
if (error) {
/*
* Duplicate found. Just throw away the new dquot and start
* over.
*/
xfs_qm_dqdestroy(dqp);
XFS_STATS_INC(mp, xs_qm_dquot_dups);
goto restart;
}
dqret:
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
trace_xfs_dqget_miss(dqp);
*O_dqpp = dqp;
return 0;
}
