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linux/fs/xfs/xfs_qm.c
Christoph Hellwig 28fb588c9b xfs: simplify xfs_qm_detach_gdquots 
There is no reason to drop qi_dqlist_lock around calls to xfs_qm_dqrele
because the free list lock now nests inside qi_dqlist_lock and the
dquot lock.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2011-12-16 15:33:30 -06:00

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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_alloc.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_bmap.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_trans_space.h"
#include "xfs_utils.h"
#include "xfs_qm.h"
#include "xfs_trace.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.
*/
struct mutex xfs_Gqm_lock;
struct xfs_qm *xfs_Gqm;
uint ndquot;
kmem_zone_t *qm_dqzone;
kmem_zone_t *qm_dqtrxzone;
STATIC void xfs_qm_list_init(xfs_dqlist_t *, char *, int);
STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
STATIC int xfs_qm_shake(struct shrinker *, struct shrink_control *);
static struct shrinker xfs_qm_shaker = {
.shrink = xfs_qm_shake,
.seeks = DEFAULT_SEEKS,
};
/*
* Initialize the XQM structure.
* Note that there is not one quota manager per file system.
*/
STATIC struct xfs_qm *
xfs_Gqm_init(void)
{
xfs_dqhash_t *udqhash, *gdqhash;
xfs_qm_t *xqm;
size_t hsize;
uint i;
/*
* Initialize the dquot hash tables.
*/
udqhash = kmem_zalloc_greedy(&hsize,
XFS_QM_HASHSIZE_LOW * sizeof(xfs_dqhash_t),
XFS_QM_HASHSIZE_HIGH * sizeof(xfs_dqhash_t));
if (!udqhash)
goto out;
gdqhash = kmem_zalloc_large(hsize);
if (!gdqhash)
goto out_free_udqhash;
hsize /= sizeof(xfs_dqhash_t);
ndquot = hsize << 8;
xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
xqm->qm_dqhashmask = hsize - 1;
xqm->qm_usr_dqhtable = udqhash;
xqm->qm_grp_dqhtable = gdqhash;
ASSERT(xqm->qm_usr_dqhtable != NULL);
ASSERT(xqm->qm_grp_dqhtable != NULL);
for (i = 0; i < hsize; i++) {
xfs_qm_list_init(&(xqm->qm_usr_dqhtable[i]), "uxdqh", i);
xfs_qm_list_init(&(xqm->qm_grp_dqhtable[i]), "gxdqh", i);
}
/*
* Freelist of all dquots of all file systems
*/
INIT_LIST_HEAD(&xqm->qm_dqfrlist);
xqm->qm_dqfrlist_cnt = 0;
mutex_init(&xqm->qm_dqfrlist_lock);
/*
* dquot zone. we register our own low-memory callback.
*/
if (!qm_dqzone) {
xqm->qm_dqzone = kmem_zone_init(sizeof(xfs_dquot_t),
"xfs_dquots");
qm_dqzone = xqm->qm_dqzone;
} else
xqm->qm_dqzone = qm_dqzone;
register_shrinker(&xfs_qm_shaker);
/*
* The t_dqinfo portion of transactions.
*/
if (!qm_dqtrxzone) {
xqm->qm_dqtrxzone = kmem_zone_init(sizeof(xfs_dquot_acct_t),
"xfs_dqtrx");
qm_dqtrxzone = xqm->qm_dqtrxzone;
} else
xqm->qm_dqtrxzone = qm_dqtrxzone;
atomic_set(&xqm->qm_totaldquots, 0);
xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
xqm->qm_nrefs = 0;
return xqm;
out_free_udqhash:
kmem_free_large(udqhash);
out:
return NULL;
}
/*
* Destroy the global quota manager when its reference count goes to zero.
*/
STATIC void
xfs_qm_destroy(
struct xfs_qm *xqm)
{
int hsize, i;
ASSERT(xqm != NULL);
ASSERT(xqm->qm_nrefs == 0);
unregister_shrinker(&xfs_qm_shaker);
mutex_lock(&xqm->qm_dqfrlist_lock);
ASSERT(list_empty(&xqm->qm_dqfrlist));
mutex_unlock(&xqm->qm_dqfrlist_lock);
hsize = xqm->qm_dqhashmask + 1;
for (i = 0; i < hsize; i++) {
xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));
xfs_qm_list_destroy(&(xqm->qm_grp_dqhtable[i]));
}
kmem_free_large(xqm->qm_usr_dqhtable);
kmem_free_large(xqm->qm_grp_dqhtable);
xqm->qm_usr_dqhtable = NULL;
xqm->qm_grp_dqhtable = NULL;
xqm->qm_dqhashmask = 0;
kmem_free(xqm);
}
/*
* Called at mount time to let XQM know that another file system is
* starting quotas. This isn't crucial information as the individual mount
* structures are pretty independent, but it helps the XQM keep a
* global view of what's going on.
*/
/* ARGSUSED */
STATIC int
xfs_qm_hold_quotafs_ref(
struct xfs_mount *mp)
{
/*
* Need to lock the xfs_Gqm structure for things like this. For example,
* the structure could disappear between the entry to this routine and
* a HOLD operation if not locked.
*/
mutex_lock(&xfs_Gqm_lock);
if (!xfs_Gqm) {
xfs_Gqm = xfs_Gqm_init();
if (!xfs_Gqm) {
mutex_unlock(&xfs_Gqm_lock);
return ENOMEM;
}
}
/*
* We can keep a list of all filesystems with quotas mounted for
* debugging and statistical purposes, but ...
* Just take a reference and get out.
*/
xfs_Gqm->qm_nrefs++;
mutex_unlock(&xfs_Gqm_lock);
return 0;
}
/*
* Release the reference that a filesystem took at mount time,
* so that we know when we need to destroy the entire quota manager.
*/
/* ARGSUSED */
STATIC void
xfs_qm_rele_quotafs_ref(
struct xfs_mount *mp)
{
ASSERT(xfs_Gqm);
ASSERT(xfs_Gqm->qm_nrefs > 0);
/*
* Destroy the entire XQM. If somebody mounts with quotaon, this'll
* be restarted.
*/
mutex_lock(&xfs_Gqm_lock);
if (--xfs_Gqm->qm_nrefs == 0) {
xfs_qm_destroy(xfs_Gqm);
xfs_Gqm = NULL;
}
mutex_unlock(&xfs_Gqm_lock);
}
/*
* Just destroy the quotainfo structure.
*/
void
xfs_qm_unmount(
struct xfs_mount *mp)
{
if (mp->m_quotainfo) {
xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
xfs_qm_destroy_quotainfo(mp);
}
}
/*
* 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(
xfs_mount_t *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_RUNNING(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) || XFS_IS_PQUOTA_ON(mp)))
mp->m_qflags &= ~XFS_OQUOTA_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_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
/*
* 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_RUNNING(mp)));
xfs_alert(mp, "%s: Superblock update failed!",
__func__);
}
}
if (error) {
xfs_warn(mp, "Failed to initialize disk quotas.");
return;
}
}
/*
* 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) {
IRELE(mp->m_quotainfo->qi_uquotaip);
mp->m_quotainfo->qi_uquotaip = NULL;
}
if (mp->m_quotainfo->qi_gquotaip) {
IRELE(mp->m_quotainfo->qi_gquotaip);
mp->m_quotainfo->qi_gquotaip = NULL;
}
}
}
/*
* Flush all dquots of the given file system to disk. The dquots are
* _not_ purged from memory here, just their data written to disk.
*/
STATIC int
xfs_qm_dqflush_all(
struct xfs_mount *mp)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
int recl;
struct xfs_dquot *dqp;
int error;
if (!q)
return 0;
again:
mutex_lock(&q->qi_dqlist_lock);
list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
xfs_dqlock(dqp);
if ((dqp->dq_flags & XFS_DQ_FREEING) ||
!XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/* XXX a sentinel would be better */
recl = q->qi_dqreclaims;
if (!xfs_dqflock_nowait(dqp)) {
/*
* If we can't grab the flush lock then check
* to see if the dquot has been flushed delayed
* write. If so, grab its buffer and send it
* out immediately. We'll be able to acquire
* the flush lock when the I/O completes.
*/
xfs_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write.
*/
mutex_unlock(&q->qi_dqlist_lock);
error = xfs_qm_dqflush(dqp, 0);
xfs_dqunlock(dqp);
if (error)
return error;
mutex_lock(&q->qi_dqlist_lock);
if (recl != q->qi_dqreclaims) {
mutex_unlock(&q->qi_dqlist_lock);
/* XXX restart limit */
goto again;
}
}
mutex_unlock(&q->qi_dqlist_lock);
/* return ! busy */
return 0;
}
/*
* Release the group dquot pointers the user dquots may be
* carrying around as a hint. mplist is locked on entry and exit.
*/
STATIC void
xfs_qm_detach_gdquots(
struct xfs_mount *mp)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
struct xfs_dquot *dqp, *gdqp;
again:
ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
xfs_dqlock(dqp);
if (dqp->dq_flags & XFS_DQ_FREEING) {
xfs_dqunlock(dqp);
mutex_unlock(&q->qi_dqlist_lock);
delay(1);
mutex_lock(&q->qi_dqlist_lock);
goto again;
}
gdqp = dqp->q_gdquot;
if (gdqp)
dqp->q_gdquot = NULL;
xfs_dqunlock(dqp);
if (gdqp)
xfs_qm_dqrele(gdqp);
}
}
/*
* Go through all the incore dquots of this file system and take them
* off the mplist and hashlist, if the dquot type matches the dqtype
* parameter. This is used when turning off quota accounting for
* users and/or groups, as well as when the filesystem is unmounting.
*/
STATIC int
xfs_qm_dqpurge_int(
struct xfs_mount *mp,
uint flags)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
struct xfs_dquot *dqp, *n;
uint dqtype;
int nmisses = 0;
LIST_HEAD (dispose_list);
if (!q)
return 0;
dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
dqtype |= (flags & XFS_QMOPT_GQUOTA) ? XFS_DQ_GROUP : 0;
mutex_lock(&q->qi_dqlist_lock);
/*
* In the first pass through all incore dquots of this filesystem,
* we release the group dquot pointers the user dquots may be
* carrying around as a hint. We need to do this irrespective of
* what's being turned off.
*/
xfs_qm_detach_gdquots(mp);
/*
* Try to get rid of all of the unwanted dquots.
*/
list_for_each_entry_safe(dqp, n, &q->qi_dqlist, q_mplist) {
xfs_dqlock(dqp);
if ((dqp->dq_flags & dqtype) != 0 &&
!(dqp->dq_flags & XFS_DQ_FREEING)) {
if (dqp->q_nrefs == 0) {
dqp->dq_flags |= XFS_DQ_FREEING;
list_move_tail(&dqp->q_mplist, &dispose_list);
} else
nmisses++;
}
xfs_dqunlock(dqp);
}
mutex_unlock(&q->qi_dqlist_lock);
list_for_each_entry_safe(dqp, n, &dispose_list, q_mplist)
xfs_qm_dqpurge(dqp);
return nmisses;
}
int
xfs_qm_dqpurge_all(
xfs_mount_t *mp,
uint flags)
{
int ndquots;
/*
* Purge the dquot cache.
* None of the dquots should really be busy at this point.
*/
if (mp->m_quotainfo) {
while ((ndquots = xfs_qm_dqpurge_int(mp, flags))) {
delay(ndquots * 10);
}
}
return 0;
}
STATIC int
xfs_qm_dqattach_one(
xfs_inode_t *ip,
xfs_dqid_t id,
uint type,
uint doalloc,
xfs_dquot_t *udqhint, /* hint */
xfs_dquot_t **IO_idqpp)
{
xfs_dquot_t *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;
}
/*
* udqhint is the i_udquot field in inode, and is non-NULL only
* when the type arg is group/project. Its purpose is to save a
* lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
* the user dquot.
*/
if (udqhint) {
ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
xfs_dqlock(udqhint);
/*
* No need to take dqlock to look at the id.
*
* The ID can't change until it gets reclaimed, and it won't
* be reclaimed as long as we have a ref from inode and we
* hold the ilock.
*/
dqp = udqhint->q_gdquot;
if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
ASSERT(*IO_idqpp == NULL);
*IO_idqpp = xfs_qm_dqhold(dqp);
xfs_dqunlock(udqhint);
return 0;
}
/*
* We can't hold a dquot lock when we call the dqget code.
* We'll deadlock in no time, because of (not conforming to)
* lock ordering - the inodelock comes before any dquot lock,
* and we may drop and reacquire the ilock in xfs_qm_dqget().
*/
xfs_dqunlock(udqhint);
}
/*
* 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(ip->i_mount, ip, id, type,
doalloc | XFS_QMOPT_DOWARN, &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;
}
/*
* Given a udquot and gdquot, attach a ptr to the group dquot in the
* udquot as a hint for future lookups.
*/
STATIC void
xfs_qm_dqattach_grouphint(
xfs_dquot_t *udq,
xfs_dquot_t *gdq)
{
xfs_dquot_t *tmp;
xfs_dqlock(udq);
tmp = udq->q_gdquot;
if (tmp) {
if (tmp == gdq)
goto done;
udq->q_gdquot = NULL;
xfs_qm_dqrele(tmp);
}
udq->q_gdquot = xfs_qm_dqhold(gdq);
done:
xfs_dqunlock(udq);
}
/*
* Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
* into account.
* If XFS_QMOPT_DQALLOC, 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,
uint flags)
{
xfs_mount_t *mp = ip->i_mount;
uint nquotas = 0;
int error = 0;
if (!XFS_IS_QUOTA_RUNNING(mp) ||
!XFS_IS_QUOTA_ON(mp) ||
!XFS_NOT_DQATTACHED(mp, ip) ||
ip->i_ino == mp->m_sb.sb_uquotino ||
ip->i_ino == mp->m_sb.sb_gquotino)
return 0;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (XFS_IS_UQUOTA_ON(mp)) {
error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
flags & XFS_QMOPT_DQALLOC,
NULL, &ip->i_udquot);
if (error)
goto done;
nquotas++;
}
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (XFS_IS_OQUOTA_ON(mp)) {
error = XFS_IS_GQUOTA_ON(mp) ?
xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
flags & XFS_QMOPT_DQALLOC,
ip->i_udquot, &ip->i_gdquot) :
xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
flags & XFS_QMOPT_DQALLOC,
ip->i_udquot, &ip->i_gdquot);
/*
* Don't worry about the udquot that we may have
* attached above. It'll get detached, if not already.
*/
if (error)
goto done;
nquotas++;
}
/*
* Attach this group quota to the user quota as a hint.
* This WON'T, in general, result in a thrash.
*/
if (nquotas == 2) {
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(ip->i_udquot);
ASSERT(ip->i_gdquot);
/*
* We do not have i_udquot locked at this point, but this check
* is OK since we don't depend on the i_gdquot to be accurate
* 100% all the time. It is just a hint, and this will
* succeed in general.
*/
if (ip->i_udquot->q_gdquot != ip->i_gdquot)
xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
}
done:
#ifdef DEBUG
if (!error) {
if (XFS_IS_UQUOTA_ON(mp))
ASSERT(ip->i_udquot);
if (XFS_IS_OQUOTA_ON(mp))
ASSERT(ip->i_gdquot);
}
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
#endif
return error;
}
int
xfs_qm_dqattach(
struct xfs_inode *ip,
uint flags)
{
int error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_qm_dqattach_locked(ip, flags);
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))
return;
trace_xfs_dquot_dqdetach(ip);
ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
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;
}
}
/*
* The hash chains and the mplist use the same xfs_dqhash structure as
* their list head, but we can take the mplist qh_lock and one of the
* hash qh_locks at the same time without any problem as they aren't
* related.
*/
static struct lock_class_key xfs_quota_mplist_class;
/*
* 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));
/*
* Tell XQM that we exist as soon as possible.
*/
if ((error = xfs_qm_hold_quotafs_ref(mp))) {
return error;
}
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_LIST_HEAD(&qinf->qi_dqlist);
mutex_init(&qinf->qi_dqlist_lock);
lockdep_set_class(&qinf->qi_dqlist_lock, &xfs_quota_mplist_class);
qinf->qi_dqreclaims = 0;
/* 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;
}
return 0;
}
/*
* 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(
xfs_mount_t *mp)
{
xfs_quotainfo_t *qi;
qi = mp->m_quotainfo;
ASSERT(qi != NULL);
ASSERT(xfs_Gqm != NULL);
/*
* Release the reference that XQM kept, so that we know
* when the XQM structure should be freed. We cannot assume
* that xfs_Gqm is non-null after this point.
*/
xfs_qm_rele_quotafs_ref(mp);
ASSERT(list_empty(&qi->qi_dqlist));
mutex_destroy(&qi->qi_dqlist_lock);
if (qi->qi_uquotaip) {
IRELE(qi->qi_uquotaip);
qi->qi_uquotaip = NULL; /* paranoia */
}
if (qi->qi_gquotaip) {
IRELE(qi->qi_gquotaip);
qi->qi_gquotaip = NULL;
}
mutex_destroy(&qi->qi_quotaofflock);
kmem_free(qi);
mp->m_quotainfo = NULL;
}
/* ------------------- PRIVATE STATIC FUNCTIONS ----------------------- */
/* ARGSUSED */
STATIC void
xfs_qm_list_init(
xfs_dqlist_t *list,
char *str,
int n)
{
mutex_init(&list->qh_lock);
INIT_LIST_HEAD(&list->qh_list);
list->qh_version = 0;
list->qh_nelems = 0;
}
STATIC void
xfs_qm_list_destroy(
xfs_dqlist_t *list)
{
mutex_destroy(&(list->qh_lock));
}
/*
* 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(
xfs_mount_t *mp,
xfs_inode_t **ip,
__int64_t sbfields,
uint flags)
{
xfs_trans_t *tp;
int error;
int committed;
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
if ((error = xfs_trans_reserve(tp,
XFS_QM_QINOCREATE_SPACE_RES(mp),
XFS_CREATE_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_CREATE_LOG_COUNT))) {
xfs_trans_cancel(tp, 0);
return error;
}
error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
if (error) {
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
XFS_TRANS_ABORT);
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_sb_version_hasquota(&mp->m_sb));
ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
(XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
xfs_sb_version_addquota(&mp->m_sb);
mp->m_sb.sb_uquotino = NULLFSINO;
mp->m_sb.sb_gquotino = NULLFSINO;
/* qflags will get updated _after_ quotacheck */
mp->m_sb.sb_qflags = 0;
}
if (flags & XFS_QMOPT_UQUOTA)
mp->m_sb.sb_uquotino = (*ip)->i_ino;
else
mp->m_sb.sb_gquotino = (*ip)->i_ino;
spin_unlock(&mp->m_sb_lock);
xfs_mod_sb(tp, sbfields);
if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
xfs_alert(mp, "%s failed (error %d)!", __func__, error);
return error;
}
return 0;
}
STATIC void
xfs_qm_reset_dqcounts(
xfs_mount_t *mp,
xfs_buf_t *bp,
xfs_dqid_t id,
uint type)
{
xfs_disk_dquot_t *ddq;
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 = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
do_div(j, sizeof(xfs_dqblk_t));
ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
#endif
ddq = bp->b_addr;
for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; 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_qm_dqcheck.
*/
(void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
"xfs_quotacheck");
ddq->d_bcount = 0;
ddq->d_icount = 0;
ddq->d_rtbcount = 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;
ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
}
}
STATIC int
xfs_qm_dqiter_bufs(
xfs_mount_t *mp,
xfs_dqid_t firstid,
xfs_fsblock_t bno,
xfs_filblks_t blkcnt,
uint flags)
{
xfs_buf_t *bp;
int error;
int type;
ASSERT(blkcnt > 0);
type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
error = 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);
if (error)
break;
xfs_qm_reset_dqcounts(mp, bp, firstid, type);
xfs_buf_delwri_queue(bp);
xfs_buf_relse(bp);
/*
* goto the next block.
*/
bno++;
firstid += mp->m_quotainfo->qi_dqperchunk;
}
return error;
}
/*
* Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
* caller supplied function for every chunk of dquots that we find.
*/
STATIC int
xfs_qm_dqiterate(
xfs_mount_t *mp,
xfs_inode_t *qip,
uint flags)
{
xfs_bmbt_irec_t *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_d.di_nblocks == 0)
return 0;
map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
lblkno = 0;
maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
do {
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.
*/
xfs_ilock(qip, XFS_ILOCK_SHARED);
error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
map, &nmaps, 0);
xfs_iunlock(qip, XFS_ILOCK_SHARED);
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);
rablkno++;
}
}
/*
* Iterate thru all the blks in the extent and
* reset the counters of all the dquots inside them.
*/
if ((error = xfs_qm_dqiter_bufs(mp,
firstid,
map[i].br_startblock,
map[i].br_blockcount,
flags))) {
break;
}
}
if (error)
break;
} while (nmaps > 0);
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_dqid_t id,
uint type,
xfs_qcnt_t nblks,
xfs_qcnt_t rtblks)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_dquot *dqp;
int error;
error = xfs_qm_dqget(mp, ip, id, type,
XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &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.
*/
be64_add_cpu(&dqp->q_core.d_icount, 1);
dqp->q_res_icount++;
if (nblks) {
be64_add_cpu(&dqp->q_core.d_bcount, nblks);
dqp->q_res_bcount += nblks;
}
if (rtblks) {
be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
dqp->q_res_rtbcount += 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_core.d_id) {
xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
}
dqp->dq_flags |= XFS_DQ_DIRTY;
xfs_qm_dqput(dqp);
return 0;
}
STATIC int
xfs_qm_get_rtblks(
xfs_inode_t *ip,
xfs_qcnt_t *O_rtblks)
{
xfs_filblks_t rtblks; /* total rt blks */
xfs_extnum_t idx; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extent entries */
int error;
ASSERT(XFS_IS_REALTIME_INODE(ip));
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
return error;
}
rtblks = 0;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (idx = 0; idx < nextents; idx++)
rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
*O_rtblks = (xfs_qcnt_t)rtblks;
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(
xfs_mount_t *mp, /* mount point for filesystem */
xfs_ino_t ino, /* inode number to get data for */
void __user *buffer, /* not used */
int ubsize, /* not used */
int *ubused, /* not used */
int *res) /* result code value */
{
xfs_inode_t *ip;
xfs_qcnt_t nblks, rtblks = 0;
int error;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* rootino must have its resources accounted for, not so with the quota
* inodes.
*/
if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
*res = BULKSTAT_RV_NOTHING;
return XFS_ERROR(EINVAL);
}
/*
* We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
* interface expects the inode to be exclusively locked because that's
* the case in all other instances. It's OK that we do this because
* quotacheck is done only at mount time.
*/
error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
if (error) {
*res = BULKSTAT_RV_NOTHING;
return error;
}
ASSERT(ip->i_delayed_blks == 0);
if (XFS_IS_REALTIME_INODE(ip)) {
/*
* Walk thru the extent list and count the realtime blocks.
*/
error = xfs_qm_get_rtblks(ip, &rtblks);
if (error)
goto error0;
}
nblks = (xfs_qcnt_t)ip->i_d.di_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, ip->i_d.di_uid,
XFS_DQ_USER, nblks, rtblks);
if (error)
goto error0;
}
if (XFS_IS_GQUOTA_ON(mp)) {
error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
XFS_DQ_GROUP, nblks, rtblks);
if (error)
goto error0;
}
if (XFS_IS_PQUOTA_ON(mp)) {
error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
XFS_DQ_PROJ, nblks, rtblks);
if (error)
goto error0;
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
IRELE(ip);
*res = BULKSTAT_RV_DIDONE;
return 0;
error0:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
IRELE(ip);
*res = BULKSTAT_RV_GIVEUP;
return error;
}
/*
* Walk thru all the filesystem inodes and construct a consistent view
* of the disk quota world. If the quotacheck fails, disable quotas.
*/
int
xfs_qm_quotacheck(
xfs_mount_t *mp)
{
int done, count, error;
xfs_ino_t lastino;
size_t structsz;
xfs_inode_t *uip, *gip;
uint flags;
count = INT_MAX;
structsz = 1;
lastino = 0;
flags = 0;
ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* There should be no cached dquots. The (simplistic) quotacheck
* algorithm doesn't like that.
*/
ASSERT(list_empty(&mp->m_quotainfo->qi_dqlist));
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.
*/
uip = mp->m_quotainfo->qi_uquotaip;
if (uip) {
error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA);
if (error)
goto error_return;
flags |= XFS_UQUOTA_CHKD;
}
gip = mp->m_quotainfo->qi_gquotaip;
if (gip) {
error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
if (error)
goto error_return;
flags |= XFS_OQUOTA_CHKD;
}
do {
/*
* Iterate thru all the inodes in the file system,
* adjusting the corresponding dquot counters in core.
*/
error = xfs_bulkstat(mp, &lastino, &count,
xfs_qm_dqusage_adjust,
structsz, NULL, &done);
if (error)
break;
} while (!done);
/*
* We've made all the changes that we need to make incore.
* Flush them down to disk buffers if everything was updated
* successfully.
*/
if (!error)
error = xfs_qm_dqflush_all(mp);
/*
* 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, XFS_QMOPT_QUOTALL);
goto error_return;
}
/*
* We didn't log anything, because if we crashed, we'll have to
* start the quotacheck from scratch anyway. However, we must make
* sure that our dquot changes are secure before we put the
* quotacheck'd stamp on the superblock. So, here we do a synchronous
* flush.
*/
xfs_flush_buftarg(mp->m_ddev_targp, 1);
/*
* 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_OQUOTA_CHKD | XFS_UQUOTA_CHKD);
mp->m_qflags |= flags;
error_return:
if (error) {
xfs_warn(mp,
"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
error);
/*
* We must turn off quotas.
*/
ASSERT(mp->m_quotainfo != NULL);
ASSERT(xfs_Gqm != 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 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)
{
xfs_inode_t *uip, *gip;
int error;
__int64_t sbflags;
uint flags;
ASSERT(mp->m_quotainfo);
uip = gip = NULL;
sbflags = 0;
flags = 0;
/*
* Get the uquota and gquota inodes
*/
if (xfs_sb_version_hasquota(&mp->m_sb)) {
if (XFS_IS_UQUOTA_ON(mp) &&
mp->m_sb.sb_uquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_uquotino > 0);
if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
0, 0, &uip)))
return XFS_ERROR(error);
}
if (XFS_IS_OQUOTA_ON(mp) &&
mp->m_sb.sb_gquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_gquotino > 0);
if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
0, 0, &gip))) {
if (uip)
IRELE(uip);
return XFS_ERROR(error);
}
}
} else {
flags |= XFS_QMOPT_SBVERSION;
sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
}
/*
* Create the two 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) {
if ((error = xfs_qm_qino_alloc(mp, &uip,
sbflags | XFS_SB_UQUOTINO,
flags | XFS_QMOPT_UQUOTA)))
return XFS_ERROR(error);
flags &= ~XFS_QMOPT_SBVERSION;
}
if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
flags |= (XFS_IS_GQUOTA_ON(mp) ?
XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
error = xfs_qm_qino_alloc(mp, &gip,
sbflags | XFS_SB_GQUOTINO, flags);
if (error) {
if (uip)
IRELE(uip);
return XFS_ERROR(error);
}
}
mp->m_quotainfo->qi_uquotaip = uip;
mp->m_quotainfo->qi_gquotaip = gip;
return 0;
}
/*
* Pop the least recently used dquot off the freelist and recycle it.
*/
STATIC struct xfs_dquot *
xfs_qm_dqreclaim_one(void)
{
struct xfs_dquot *dqp;
int restarts = 0;
mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
restart:
list_for_each_entry(dqp, &xfs_Gqm->qm_dqfrlist, q_freelist) {
struct xfs_mount *mp = dqp->q_mount;
if (!xfs_dqlock_nowait(dqp))
continue;
/*
* This dquot has already been grabbed by dqlookup.
* Remove it from the freelist and try again.
*/
if (dqp->q_nrefs) {
trace_xfs_dqreclaim_want(dqp);
XQM_STATS_INC(xqmstats.xs_qm_dqwants);
list_del_init(&dqp->q_freelist);
xfs_Gqm->qm_dqfrlist_cnt--;
restarts++;
goto dqunlock;
}
ASSERT(dqp->q_hash);
ASSERT(!list_empty(&dqp->q_mplist));
/*
* Try to grab the flush lock. If this dquot is in the process
* of getting flushed to disk, we don't want to reclaim it.
*/
if (!xfs_dqflock_nowait(dqp))
goto dqunlock;
/*
* We have the flush lock so we know that this is not in the
* process of being flushed. So, if this is dirty, flush it
* DELWRI so that we don't get a freelist infested with
* dirty dquots.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
int error;
trace_xfs_dqreclaim_dirty(dqp);
/*
* We flush it delayed write, so don't bother
* releasing the freelist lock.
*/
error = xfs_qm_dqflush(dqp, SYNC_TRYLOCK);
if (error) {
xfs_warn(mp, "%s: dquot %p flush failed",
__func__, dqp);
}
goto dqunlock;
}
xfs_dqfunlock(dqp);
/*
* Prevent lookup now that we are going to reclaim the dquot.
* Once XFS_DQ_FREEING is set lookup won't touch the dquot,
* thus we can drop the lock now.
*/
dqp->dq_flags |= XFS_DQ_FREEING;
xfs_dqunlock(dqp);
mutex_lock(&dqp->q_hash->qh_lock);
list_del_init(&dqp->q_hashlist);
dqp->q_hash->qh_version++;
mutex_unlock(&dqp->q_hash->qh_lock);
mutex_lock(&mp->m_quotainfo->qi_dqlist_lock);
list_del_init(&dqp->q_mplist);
mp->m_quotainfo->qi_dquots--;
mp->m_quotainfo->qi_dqreclaims++;
mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
ASSERT(dqp->q_nrefs == 0);
list_del_init(&dqp->q_freelist);
xfs_Gqm->qm_dqfrlist_cnt--;
mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
return dqp;
dqunlock:
xfs_dqunlock(dqp);
if (restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
break;
goto restart;
}
mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
return NULL;
}
/*
* Traverse the freelist of dquots and attempt to reclaim a maximum of
* 'howmany' dquots. This operation races with dqlookup(), and attempts to
* favor the lookup function ...
*/
STATIC int
xfs_qm_shake_freelist(
int howmany)
{
int nreclaimed = 0;
xfs_dquot_t *dqp;
if (howmany <= 0)
return 0;
while (nreclaimed < howmany) {
dqp = xfs_qm_dqreclaim_one();
if (!dqp)
return nreclaimed;
xfs_qm_dqdestroy(dqp);
nreclaimed++;
}
return nreclaimed;
}
/*
* The kmem_shake interface is invoked when memory is running low.
*/
/* ARGSUSED */
STATIC int
xfs_qm_shake(
struct shrinker *shrink,
struct shrink_control *sc)
{
int ndqused, nfree, n;
gfp_t gfp_mask = sc->gfp_mask;
if (!kmem_shake_allow(gfp_mask))
return 0;
if (!xfs_Gqm)
return 0;
nfree = xfs_Gqm->qm_dqfrlist_cnt; /* free dquots */
/* incore dquots in all f/s's */
ndqused = atomic_read(&xfs_Gqm->qm_totaldquots) - nfree;
ASSERT(ndqused >= 0);
if (nfree <= ndqused && nfree < ndquot)
return 0;
ndqused *= xfs_Gqm->qm_dqfree_ratio; /* target # of free dquots */
n = nfree - ndqused - ndquot; /* # over target */
return xfs_qm_shake_freelist(MAX(nfree, n));
}
/*------------------------------------------------------------------*/
/*
* Return a new incore dquot. Depending on the number of
* dquots in the system, we either allocate a new one on the kernel heap,
* or reclaim a free one.
* Return value is B_TRUE if we allocated a new dquot, B_FALSE if we managed
* to reclaim an existing one from the freelist.
*/
boolean_t
xfs_qm_dqalloc_incore(
xfs_dquot_t **O_dqpp)
{
xfs_dquot_t *dqp;
/*
* Check against high water mark to see if we want to pop
* a nincompoop dquot off the freelist.
*/
if (atomic_read(&xfs_Gqm->qm_totaldquots) >= ndquot) {
/*
* Try to recycle a dquot from the freelist.
*/
if ((dqp = xfs_qm_dqreclaim_one())) {
XQM_STATS_INC(xqmstats.xs_qm_dqreclaims);
/*
* Just zero the core here. The rest will get
* reinitialized by caller. XXX we shouldn't even
* do this zero ...
*/
memset(&dqp->q_core, 0, sizeof(dqp->q_core));
*O_dqpp = dqp;
return B_FALSE;
}
XQM_STATS_INC(xqmstats.xs_qm_dqreclaim_misses);
}
/*
* Allocate a brand new dquot on the kernel heap and return it
* to the caller to initialize.
*/
ASSERT(xfs_Gqm->qm_dqzone != NULL);
*O_dqpp = kmem_zone_zalloc(xfs_Gqm->qm_dqzone, KM_SLEEP);
atomic_inc(&xfs_Gqm->qm_totaldquots);
return B_TRUE;
}
/*
* Start a transaction and write the incore superblock changes to
* disk. flags parameter indicates which fields have changed.
*/
int
xfs_qm_write_sb_changes(
xfs_mount_t *mp,
__int64_t flags)
{
xfs_trans_t *tp;
int error;
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
if ((error = xfs_trans_reserve(tp, 0,
mp->m_sb.sb_sectsize + 128, 0,
0,
XFS_DEFAULT_LOG_COUNT))) {
xfs_trans_cancel(tp, 0);
return error;
}
xfs_mod_sb(tp, flags);
error = xfs_trans_commit(tp, 0);
return error;
}
/* --------------- 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,
uid_t uid,
gid_t gid,
prid_t prid,
uint flags,
struct xfs_dquot **O_udqpp,
struct xfs_dquot **O_gdqpp)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_dquot *uq, *gq;
int error;
uint lockflags;
if (!XFS_IS_QUOTA_RUNNING(mp) || !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 = ip->i_d.di_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, XFS_QMOPT_DQALLOC);
if (error) {
xfs_iunlock(ip, lockflags);
return error;
}
}
uq = gq = NULL;
if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
if (ip->i_d.di_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);
if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
XFS_DQ_USER,
XFS_QMOPT_DQALLOC |
XFS_QMOPT_DOWARN,
&uq))) {
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)) {
if (ip->i_d.di_gid != gid) {
xfs_iunlock(ip, lockflags);
if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
XFS_DQ_GROUP,
XFS_QMOPT_DQALLOC |
XFS_QMOPT_DOWARN,
&gq))) {
if (uq)
xfs_qm_dqrele(uq);
ASSERT(error != ENOENT);
return error;
}
xfs_dqunlock(gq);
lockflags = XFS_ILOCK_SHARED;
xfs_ilock(ip, lockflags);
} else {
ASSERT(ip->i_gdquot);
gq = xfs_qm_dqhold(ip->i_gdquot);
}
} else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
if (xfs_get_projid(ip) != prid) {
xfs_iunlock(ip, lockflags);
if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
XFS_DQ_PROJ,
XFS_QMOPT_DQALLOC |
XFS_QMOPT_DOWARN,
&gq))) {
if (uq)
xfs_qm_dqrele(uq);
ASSERT(error != ENOENT);
return (error);
}
xfs_dqunlock(gq);
lockflags = XFS_ILOCK_SHARED;
xfs_ilock(ip, lockflags);
} else {
ASSERT(ip->i_gdquot);
gq = xfs_qm_dqhold(ip->i_gdquot);
}
}
if (uq)
trace_xfs_dquot_dqalloc(ip);
xfs_iunlock(ip, lockflags);
if (O_udqpp)
*O_udqpp = uq;
else if (uq)
xfs_qm_dqrele(uq);
if (O_gdqpp)
*O_gdqpp = gq;
else if (gq)
xfs_qm_dqrele(gq);
return 0;
}
/*
* Actually transfer ownership, and do dquot modifications.
* These were already reserved.
*/
xfs_dquot_t *
xfs_qm_vop_chown(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t **IO_olddq,
xfs_dquot_t *newdq)
{
xfs_dquot_t *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_RUNNING(ip->i_mount));
/* old dquot */
prevdq = *IO_olddq;
ASSERT(prevdq);
ASSERT(prevdq != newdq);
xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_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_d.di_nblocks);
xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
/*
* 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;
}
/*
* Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
*/
int
xfs_qm_vop_chown_reserve(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t *udqp,
xfs_dquot_t *gdqp,
uint flags)
{
xfs_mount_t *mp = ip->i_mount;
uint delblks, blkflags, prjflags = 0;
xfs_dquot_t *unresudq, *unresgdq, *delblksudq, *delblksgdq;
int error;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
delblks = ip->i_delayed_blks;
delblksudq = delblksgdq = unresudq = unresgdq = NULL;
blkflags = XFS_IS_REALTIME_INODE(ip) ?
XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
if (XFS_IS_UQUOTA_ON(mp) && udqp &&
ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
delblksudq = udqp;
/*
* If there are delayed allocation blocks, then we have to
* unreserve those from the old dquot, and add them to the
* new dquot.
*/
if (delblks) {
ASSERT(ip->i_udquot);
unresudq = ip->i_udquot;
}
}
if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
prjflags = XFS_QMOPT_ENOSPC;
if (prjflags ||
(XFS_IS_GQUOTA_ON(ip->i_mount) &&
ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
delblksgdq = gdqp;
if (delblks) {
ASSERT(ip->i_gdquot);
unresgdq = ip->i_gdquot;
}
}
}
if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
flags | blkflags | prjflags)))
return (error);
/*
* Do the delayed blks reservations/unreservations now. Since, these
* are done without the help of a transaction, if a reservation fails
* its previous reservations won't be automatically undone by trans
* code. So, we have to do it manually here.
*/
if (delblks) {
/*
* Do the reservations first. Unreservation can't fail.
*/
ASSERT(delblksudq || delblksgdq);
ASSERT(unresudq || unresgdq);
if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
flags | blkflags | prjflags)))
return (error);
xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
blkflags);
}
return (0);
}
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_RUNNING(mp) || !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, 0);
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_mount *mp = tp->t_mountp;
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
return;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
if (udqp) {
ASSERT(ip->i_udquot == NULL);
ASSERT(XFS_IS_UQUOTA_ON(mp));
ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
ip->i_udquot = xfs_qm_dqhold(udqp);
xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
}
if (gdqp) {
ASSERT(ip->i_gdquot == NULL);
ASSERT(XFS_IS_OQUOTA_ON(mp));
ASSERT((XFS_IS_GQUOTA_ON(mp) ?
ip->i_d.di_gid : xfs_get_projid(ip)) ==
be32_to_cpu(gdqp->q_core.d_id));
ip->i_gdquot = xfs_qm_dqhold(gdqp);
xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
}
}
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