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linux-sg2042/fs/xfs/quota/xfs_qm.c

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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_clnt.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_bmap.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_trans_space.h"
#include "xfs_utils.h"
#include "xfs_qm.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.
*/
mutex_t xfs_Gqm_lock;
struct xfs_qm *xfs_Gqm;
uint ndquot;
kmem_zone_t *qm_dqzone;
kmem_zone_t *qm_dqtrxzone;
static cred_t xfs_zerocr;
STATIC void xfs_qm_list_init(xfs_dqlist_t *, char *, int);
STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
STATIC void xfs_qm_freelist_init(xfs_frlist_t *);
STATIC void xfs_qm_freelist_destroy(xfs_frlist_t *);
STATIC int xfs_qm_mplist_nowait(xfs_mount_t *);
STATIC int xfs_qm_dqhashlock_nowait(xfs_dquot_t *);
STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
STATIC int xfs_qm_shake(int, gfp_t);
static struct shrinker xfs_qm_shaker = {
.shrink = xfs_qm_shake,
.seeks = DEFAULT_SEEKS,
};
#ifdef DEBUG
extern mutex_t qcheck_lock;
#endif
#ifdef QUOTADEBUG
#define XQM_LIST_PRINT(l, NXT, title) \
{ \
xfs_dquot_t *dqp; int i = 0; \
cmn_err(CE_DEBUG, "%s (#%d)", title, (int) (l)->qh_nelems); \
for (dqp = (l)->qh_next; dqp != NULL; dqp = dqp->NXT) { \
cmn_err(CE_DEBUG, " %d. \"%d (%s)\" " \
"bcnt = %d, icnt = %d, refs = %d", \
++i, (int) be32_to_cpu(dqp->q_core.d_id), \
DQFLAGTO_TYPESTR(dqp), \
(int) be64_to_cpu(dqp->q_core.d_bcount), \
(int) be64_to_cpu(dqp->q_core.d_icount), \
(int) dqp->q_nrefs); } \
}
#else
#define XQM_LIST_PRINT(l, NXT, title) do { } while (0)
#endif
/*
* 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),
KM_SLEEP | KM_MAYFAIL | KM_LARGE);
gdqhash = kmem_zalloc(hsize, KM_SLEEP | KM_LARGE);
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
*/
xfs_qm_freelist_init(&(xqm->qm_dqfreelist));
/*
* 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;
#ifdef DEBUG
mutex_init(&qcheck_lock);
#endif
return xqm;
}
/*
* 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);
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(xqm->qm_usr_dqhtable, hsize * sizeof(xfs_dqhash_t));
kmem_free(xqm->qm_grp_dqhtable, hsize * sizeof(xfs_dqhash_t));
xqm->qm_usr_dqhtable = NULL;
xqm->qm_grp_dqhtable = NULL;
xqm->qm_dqhashmask = 0;
xfs_qm_freelist_destroy(&(xqm->qm_dqfreelist));
#ifdef DEBUG
mutex_destroy(&qcheck_lock);
#endif
kmem_free(xqm, sizeof(xfs_qm_t));
}
/*
* 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.
*/
XFS_QM_LOCK(xfs_Gqm);
if (xfs_Gqm == NULL)
xfs_Gqm = xfs_Gqm_init();
/*
* 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_QM_HOLD(xfs_Gqm);
XFS_QM_UNLOCK(xfs_Gqm);
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)
{
xfs_dquot_t *dqp, *nextdqp;
ASSERT(xfs_Gqm);
ASSERT(xfs_Gqm->qm_nrefs > 0);
/*
* Go thru the freelist and destroy all inactive dquots.
*/
xfs_qm_freelist_lock(xfs_Gqm);
for (dqp = xfs_Gqm->qm_dqfreelist.qh_next;
dqp != (xfs_dquot_t *)&(xfs_Gqm->qm_dqfreelist); ) {
xfs_dqlock(dqp);
nextdqp = dqp->dq_flnext;
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(dqp->MPL_PREVP == NULL);
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
xfs_qm_dqdestroy(dqp);
} else {
xfs_dqunlock(dqp);
}
dqp = nextdqp;
}
xfs_qm_freelist_unlock(xfs_Gqm);
/*
* Destroy the entire XQM. If somebody mounts with quotaon, this'll
* be restarted.
*/
XFS_QM_LOCK(xfs_Gqm);
XFS_QM_RELE(xfs_Gqm);
if (xfs_Gqm->qm_nrefs == 0) {
xfs_qm_destroy(xfs_Gqm);
xfs_Gqm = NULL;
}
XFS_QM_UNLOCK(xfs_Gqm);
}
/*
* Just destroy the quotainfo structure.
*/
void
xfs_qm_unmount_quotadestroy(
xfs_mount_t *mp)
{
if (mp->m_quotainfo)
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 mfsi_flags)
{
int error = 0;
uint sbf;
/*
* If quotas on realtime volumes is not supported, we disable
* quotas immediately.
*/
if (mp->m_sb.sb_rextents) {
cmn_err(CE_NOTE,
"Cannot turn on quotas for realtime filesystem %s",
mp->m_fsname);
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) &&
!(mfsi_flags & XFS_MFSI_NO_QUOTACHECK)) {
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_fs_cmn_err(CE_ALERT, mp,
"XFS mount_quotas: Superblock update failed!");
}
}
if (error) {
xfs_fs_cmn_err(CE_WARN, mp,
"Failed to initialize disk quotas.");
}
return;
}
/*
* Called from the vfsops layer.
*/
int
xfs_qm_unmount_quotas(
xfs_mount_t *mp)
{
xfs_inode_t *uqp, *gqp;
int error = 0;
/*
* 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);
/*
* Flush out the quota inodes.
*/
uqp = gqp = NULL;
if (mp->m_quotainfo) {
if ((uqp = mp->m_quotainfo->qi_uquotaip) != NULL) {
xfs_ilock(uqp, XFS_ILOCK_EXCL);
xfs_iflock(uqp);
error = xfs_iflush(uqp, XFS_IFLUSH_SYNC);
xfs_iunlock(uqp, XFS_ILOCK_EXCL);
if (unlikely(error == EFSCORRUPTED)) {
XFS_ERROR_REPORT("xfs_qm_unmount_quotas(1)",
XFS_ERRLEVEL_LOW, mp);
goto out;
}
}
if ((gqp = mp->m_quotainfo->qi_gquotaip) != NULL) {
xfs_ilock(gqp, XFS_ILOCK_EXCL);
xfs_iflock(gqp);
error = xfs_iflush(gqp, XFS_IFLUSH_SYNC);
xfs_iunlock(gqp, XFS_ILOCK_EXCL);
if (unlikely(error == EFSCORRUPTED)) {
XFS_ERROR_REPORT("xfs_qm_unmount_quotas(2)",
XFS_ERRLEVEL_LOW, mp);
goto out;
}
}
}
if (uqp) {
XFS_PURGE_INODE(uqp);
mp->m_quotainfo->qi_uquotaip = NULL;
}
if (gqp) {
XFS_PURGE_INODE(gqp);
mp->m_quotainfo->qi_gquotaip = NULL;
}
out:
return XFS_ERROR(error);
}
/*
* 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(
xfs_mount_t *mp,
int flags)
{
int recl;
xfs_dquot_t *dqp;
int niters;
int error;
if (mp->m_quotainfo == NULL)
return 0;
niters = 0;
again:
xfs_qm_mplist_lock(mp);
FOREACH_DQUOT_IN_MP(dqp, mp) {
xfs_dqlock(dqp);
if (! XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
xfs_dqtrace_entry(dqp, "FLUSHALL: DQDIRTY");
/* XXX a sentinel would be better */
recl = XFS_QI_MPLRECLAIMS(mp);
if (! xfs_qm_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_qm_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write.
*/
xfs_qm_mplist_unlock(mp);
error = xfs_qm_dqflush(dqp, flags);
xfs_dqunlock(dqp);
if (error)
return error;
xfs_qm_mplist_lock(mp);
if (recl != XFS_QI_MPLRECLAIMS(mp)) {
xfs_qm_mplist_unlock(mp);
/* XXX restart limit */
goto again;
}
}
xfs_qm_mplist_unlock(mp);
/* 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(
xfs_mount_t *mp)
{
xfs_dquot_t *dqp, *gdqp;
int nrecl;
again:
ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
dqp = XFS_QI_MPLNEXT(mp);
while (dqp) {
xfs_dqlock(dqp);
if ((gdqp = dqp->q_gdquot)) {
xfs_dqlock(gdqp);
dqp->q_gdquot = NULL;
}
xfs_dqunlock(dqp);
if (gdqp) {
/*
* Can't hold the mplist lock across a dqput.
* XXXmust convert to marker based iterations here.
*/
nrecl = XFS_QI_MPLRECLAIMS(mp);
xfs_qm_mplist_unlock(mp);
xfs_qm_dqput(gdqp);
xfs_qm_mplist_lock(mp);
if (nrecl != XFS_QI_MPLRECLAIMS(mp))
goto again;
}
dqp = dqp->MPL_NEXT;
}
}
/*
* 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(
xfs_mount_t *mp,
uint flags) /* QUOTAOFF/UMOUNTING/UQUOTA/PQUOTA/GQUOTA */
{
xfs_dquot_t *dqp;
uint dqtype;
int nrecl;
xfs_dquot_t *nextdqp;
int nmisses;
if (mp->m_quotainfo == NULL)
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;
xfs_qm_mplist_lock(mp);
/*
* 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);
again:
nmisses = 0;
ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
/*
* Try to get rid of all of the unwanted dquots. The idea is to
* get them off mplist and hashlist, but leave them on freelist.
*/
dqp = XFS_QI_MPLNEXT(mp);
while (dqp) {
/*
* It's OK to look at the type without taking dqlock here.
* We're holding the mplist lock here, and that's needed for
* a dqreclaim.
*/
if ((dqp->dq_flags & dqtype) == 0) {
dqp = dqp->MPL_NEXT;
continue;
}
if (! xfs_qm_dqhashlock_nowait(dqp)) {
nrecl = XFS_QI_MPLRECLAIMS(mp);
xfs_qm_mplist_unlock(mp);
XFS_DQ_HASH_LOCK(dqp->q_hash);
xfs_qm_mplist_lock(mp);
/*
* XXXTheoretically, we can get into a very long
* ping pong game here.
* No one can be adding dquots to the mplist at
* this point, but somebody might be taking things off.
*/
if (nrecl != XFS_QI_MPLRECLAIMS(mp)) {
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
goto again;
}
}
/*
* Take the dquot off the mplist and hashlist. It may remain on
* freelist in INACTIVE state.
*/
nextdqp = dqp->MPL_NEXT;
nmisses += xfs_qm_dqpurge(dqp, flags);
dqp = nextdqp;
}
xfs_qm_mplist_unlock(mp);
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,
uint dolock,
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.
*/
if ((dqp = *IO_idqpp)) {
if (dolock)
xfs_dqlock(dqp);
xfs_dqtrace_entry(dqp, "DQATTACH: found in ip");
goto done;
}
/*
* 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.
*/
ASSERT(!udqhint || type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
if (udqhint && !dolock)
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.
*/
if (udqhint &&
(dqp = udqhint->q_gdquot) &&
(be32_to_cpu(dqp->q_core.d_id) == id)) {
ASSERT(XFS_DQ_IS_LOCKED(udqhint));
xfs_dqlock(dqp);
XFS_DQHOLD(dqp);
ASSERT(*IO_idqpp == NULL);
*IO_idqpp = dqp;
if (!dolock) {
xfs_dqunlock(dqp);
xfs_dqunlock(udqhint);
}
goto done;
}
/*
* 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().
*/
if (udqhint)
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.
*/
if ((error = xfs_qm_dqget(ip->i_mount, ip, id, type,
doalloc|XFS_QMOPT_DOWARN, &dqp))) {
if (udqhint && dolock)
xfs_dqlock(udqhint);
goto done;
}
xfs_dqtrace_entry(dqp, "DQATTACH: found by dqget");
/*
* 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;
ASSERT(dqp);
ASSERT(XFS_DQ_IS_LOCKED(dqp));
if (! dolock) {
xfs_dqunlock(dqp);
goto done;
}
if (! udqhint)
goto done;
ASSERT(udqhint);
ASSERT(dolock);
ASSERT(XFS_DQ_IS_LOCKED(dqp));
if (! xfs_qm_dqlock_nowait(udqhint)) {
xfs_dqunlock(dqp);
xfs_dqlock(udqhint);
xfs_dqlock(dqp);
}
done:
#ifdef QUOTADEBUG
if (udqhint) {
if (dolock)
ASSERT(XFS_DQ_IS_LOCKED(udqhint));
}
if (! error) {
if (dolock)
ASSERT(XFS_DQ_IS_LOCKED(dqp));
}
#endif
return error;
}
/*
* Given a udquot and gdquot, attach a ptr to the group dquot in the
* udquot as a hint for future lookups. The idea sounds simple, but the
* execution isn't, because the udquot might have a group dquot attached
* already and getting rid of that gets us into lock ordering constraints.
* The process is complicated more by the fact that the dquots may or may not
* be locked on entry.
*/
STATIC void
xfs_qm_dqattach_grouphint(
xfs_dquot_t *udq,
xfs_dquot_t *gdq,
uint locked)
{
xfs_dquot_t *tmp;
#ifdef QUOTADEBUG
if (locked) {
ASSERT(XFS_DQ_IS_LOCKED(udq));
ASSERT(XFS_DQ_IS_LOCKED(gdq));
}
#endif
if (! locked)
xfs_dqlock(udq);
if ((tmp = udq->q_gdquot)) {
if (tmp == gdq) {
if (! locked)
xfs_dqunlock(udq);
return;
}
udq->q_gdquot = NULL;
/*
* We can't keep any dqlocks when calling dqrele,
* because the freelist lock comes before dqlocks.
*/
xfs_dqunlock(udq);
if (locked)
xfs_dqunlock(gdq);
/*
* we took a hard reference once upon a time in dqget,
* so give it back when the udquot no longer points at it
* dqput() does the unlocking of the dquot.
*/
xfs_qm_dqrele(tmp);
xfs_dqlock(udq);
xfs_dqlock(gdq);
} else {
ASSERT(XFS_DQ_IS_LOCKED(udq));
if (! locked) {
xfs_dqlock(gdq);
}
}
ASSERT(XFS_DQ_IS_LOCKED(udq));
ASSERT(XFS_DQ_IS_LOCKED(gdq));
/*
* Somebody could have attached a gdquot here,
* when we dropped the uqlock. If so, just do nothing.
*/
if (udq->q_gdquot == NULL) {
XFS_DQHOLD(gdq);
udq->q_gdquot = gdq;
}
if (! locked) {
xfs_dqunlock(gdq);
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.
* If XFS_QMOPT_DQLOCK, the dquot(s) will be returned locked. This option pretty
* much made this code a complete mess, but it has been pretty useful.
* If XFS_QMOPT_ILOCKED, then inode sent is already locked EXCL.
* Inode may get unlocked and relocked in here, and the caller must deal with
* the consequences.
*/
int
xfs_qm_dqattach(
xfs_inode_t *ip,
uint flags)
{
xfs_mount_t *mp = ip->i_mount;
uint nquotas = 0;
int error = 0;
if ((! 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((flags & XFS_QMOPT_ILOCKED) == 0 ||
xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (! (flags & XFS_QMOPT_ILOCKED))
xfs_ilock(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,
flags & XFS_QMOPT_DQLOCK,
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,
flags & XFS_QMOPT_DQLOCK,
ip->i_udquot, &ip->i_gdquot) :
xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
flags & XFS_QMOPT_DQALLOC,
flags & XFS_QMOPT_DQLOCK,
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 may or may not have the 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)
goto done;
/*
* Attach i_gdquot to the gdquot hint inside the i_udquot.
*/
xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot,
flags & XFS_QMOPT_DQLOCK);
}
done:
#ifdef QUOTADEBUG
if (! error) {
if (ip->i_udquot) {
if (flags & XFS_QMOPT_DQLOCK)
ASSERT(XFS_DQ_IS_LOCKED(ip->i_udquot));
}
if (ip->i_gdquot) {
if (flags & XFS_QMOPT_DQLOCK)
ASSERT(XFS_DQ_IS_LOCKED(ip->i_gdquot));
}
if (XFS_IS_UQUOTA_ON(mp))
ASSERT(ip->i_udquot);
if (XFS_IS_OQUOTA_ON(mp))
ASSERT(ip->i_gdquot);
}
#endif
if (! (flags & XFS_QMOPT_ILOCKED))
xfs_iunlock(ip, XFS_ILOCK_EXCL);
#ifdef QUOTADEBUG
else
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
#endif
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;
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_dqtrace_entry_ino(ip->i_udquot, "DQDETTACH", ip);
xfs_qm_dqrele(ip->i_udquot);
ip->i_udquot = NULL;
}
if (ip->i_gdquot) {
xfs_dqtrace_entry_ino(ip->i_gdquot, "DQDETTACH", ip);
xfs_qm_dqrele(ip->i_gdquot);
ip->i_gdquot = NULL;
}
}
/*
* This is called by VFS_SYNC and flags arg determines the caller,
* and its motives, as done in xfs_sync.
*
* vfs_sync: SYNC_FSDATA|SYNC_ATTR|SYNC_BDFLUSH 0x31
* syscall sync: SYNC_FSDATA|SYNC_ATTR|SYNC_DELWRI 0x25
* umountroot : SYNC_WAIT | SYNC_CLOSE | SYNC_ATTR | SYNC_FSDATA
*/
int
xfs_qm_sync(
xfs_mount_t *mp,
int flags)
{
int recl, restarts;
xfs_dquot_t *dqp;
uint flush_flags;
boolean_t nowait;
int error;
if (! XFS_IS_QUOTA_ON(mp))
return 0;
restarts = 0;
/*
* We won't block unless we are asked to.
*/
nowait = (boolean_t)(flags & SYNC_BDFLUSH || (flags & SYNC_WAIT) == 0);
again:
xfs_qm_mplist_lock(mp);
/*
* dqpurge_all() also takes the mplist lock and iterate thru all dquots
* in quotaoff. However, if the QUOTA_ACTIVE bits are not cleared
* when we have the mplist lock, we know that dquots will be consistent
* as long as we have it locked.
*/
if (! XFS_IS_QUOTA_ON(mp)) {
xfs_qm_mplist_unlock(mp);
return 0;
}
FOREACH_DQUOT_IN_MP(dqp, mp) {
/*
* If this is vfs_sync calling, then skip the dquots that
* don't 'seem' to be dirty. ie. don't acquire dqlock.
* This is very similar to what xfs_sync does with inodes.
*/
if (flags & SYNC_BDFLUSH) {
if (! XFS_DQ_IS_DIRTY(dqp))
continue;
}
if (nowait) {
/*
* Try to acquire the dquot lock. We are NOT out of
* lock order, but we just don't want to wait for this
* lock, unless somebody wanted us to.
*/
if (! xfs_qm_dqlock_nowait(dqp))
continue;
} else {
xfs_dqlock(dqp);
}
/*
* Now, find out for sure if this dquot is dirty or not.
*/
if (! XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/* XXX a sentinel would be better */
recl = XFS_QI_MPLRECLAIMS(mp);
if (! xfs_qm_dqflock_nowait(dqp)) {
if (nowait) {
xfs_dqunlock(dqp);
continue;
}
/*
* If we can't grab the flush lock then if the caller
* really wanted us to give this our best shot, so
* see if we can give a push to the buffer before we wait
* on the flush lock. At this point, we know that
* even though the dquot is being flushed,
* it has (new) dirty data.
*/
xfs_qm_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write
*/
flush_flags = (nowait) ? XFS_QMOPT_DELWRI : XFS_QMOPT_SYNC;
xfs_qm_mplist_unlock(mp);
xfs_dqtrace_entry(dqp, "XQM_SYNC: DQFLUSH");
error = xfs_qm_dqflush(dqp, flush_flags);
xfs_dqunlock(dqp);
if (error && XFS_FORCED_SHUTDOWN(mp))
return 0; /* Need to prevent umount failure */
else if (error)
return error;
xfs_qm_mplist_lock(mp);
if (recl != XFS_QI_MPLRECLAIMS(mp)) {
if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
break;
xfs_qm_mplist_unlock(mp);
goto again;
}
}
xfs_qm_mplist_unlock(mp);
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));
/*
* 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, sizeof(xfs_quotainfo_t));
mp->m_quotainfo = NULL;
return error;
}
spin_lock_init(&qinf->qi_pinlock);
xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
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.
*/
error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)0,
XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
(XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
XFS_DQ_PROJ),
XFS_QMOPT_DQSUSER|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);
/*
* We sent the XFS_QMOPT_DQSUSER flag to dqget because
* we don't want this dquot cached. We haven't done a
* quotacheck yet, and quotacheck doesn't like incore dquots.
*/
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);
spinlock_destroy(&qi->qi_pinlock);
xfs_qm_list_destroy(&qi->qi_dqlist);
if (qi->qi_uquotaip) {
XFS_PURGE_INODE(qi->qi_uquotaip);
qi->qi_uquotaip = NULL; /* paranoia */
}
if (qi->qi_gquotaip) {
XFS_PURGE_INODE(qi->qi_gquotaip);
qi->qi_gquotaip = NULL;
}
mutex_destroy(&qi->qi_quotaofflock);
kmem_free(qi, sizeof(xfs_quotainfo_t));
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);
list->qh_next = NULL;
list->qh_version = 0;
list->qh_nelems = 0;
}
STATIC void
xfs_qm_list_destroy(
xfs_dqlist_t *list)
{
mutex_destroy(&(list->qh_lock));
}
/*
* Stripped down version of dqattach. This doesn't attach, or even look at the
* dquots attached to the inode. The rationale is that there won't be any
* attached at the time this is called from quotacheck.
*/
STATIC int
xfs_qm_dqget_noattach(
xfs_inode_t *ip,
xfs_dquot_t **O_udqpp,
xfs_dquot_t **O_gdqpp)
{
int error;
xfs_mount_t *mp;
xfs_dquot_t *udqp, *gdqp;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
mp = ip->i_mount;
udqp = NULL;
gdqp = NULL;
if (XFS_IS_UQUOTA_ON(mp)) {
ASSERT(ip->i_udquot == NULL);
/*
* We want the dquot allocated if it doesn't exist.
*/
if ((error = xfs_qm_dqget(mp, ip, ip->i_d.di_uid, XFS_DQ_USER,
XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN,
&udqp))) {
/*
* Shouldn't be able to turn off quotas here.
*/
ASSERT(error != ESRCH);
ASSERT(error != ENOENT);
return error;
}
ASSERT(udqp);
}
if (XFS_IS_OQUOTA_ON(mp)) {
ASSERT(ip->i_gdquot == NULL);
if (udqp)
xfs_dqunlock(udqp);
error = XFS_IS_GQUOTA_ON(mp) ?
xfs_qm_dqget(mp, ip,
ip->i_d.di_gid, XFS_DQ_GROUP,
XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
&gdqp) :
xfs_qm_dqget(mp, ip,
ip->i_d.di_projid, XFS_DQ_PROJ,
XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
&gdqp);
if (error) {
if (udqp)
xfs_qm_dqrele(udqp);
ASSERT(error != ESRCH);
ASSERT(error != ENOENT);
return error;
}
ASSERT(gdqp);
/* Reacquire the locks in the right order */
if (udqp) {
if (! xfs_qm_dqlock_nowait(udqp)) {
xfs_dqunlock(gdqp);
xfs_dqlock(udqp);
xfs_dqlock(gdqp);
}
}
}
*O_udqpp = udqp;
*O_gdqpp = gdqp;
#ifdef QUOTADEBUG
if (udqp) ASSERT(XFS_DQ_IS_LOCKED(udqp));
if (gdqp) ASSERT(XFS_DQ_IS_LOCKED(gdqp));
#endif
return 0;
}
/*
* 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;
}
if ((error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0,
&xfs_zerocr, 0, 1, ip, &committed))) {
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
XFS_TRANS_ABORT);
return error;
}
/*
* Keep an extra reference to this quota inode. This inode is
* locked exclusively and joined to the transaction already.
*/
ASSERT(xfs_isilocked(*ip, XFS_ILOCK_EXCL));
VN_HOLD(XFS_ITOV((*ip)));
/*
* 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) {
#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
unsigned oldv = mp->m_sb.sb_versionnum;
#endif
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 defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
cmn_err(CE_NOTE,
"Old superblock version %x, converting to %x.",
oldv, mp->m_sb.sb_versionnum);
#endif
}
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_fs_cmn_err(CE_ALERT, mp, "XFS qino_alloc failed!");
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;
xfs_buftrace("RESET DQUOTS", bp);
/*
* 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(XFS_QM_DQPERBLK(mp) == j);
#endif
ddq = (xfs_disk_dquot_t *)XFS_BUF_PTR(bp);
for (j = 0; j < XFS_QM_DQPERBLK(mp); 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(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 notcommitted;
int incr;
int type;
ASSERT(blkcnt > 0);
notcommitted = 0;
incr = (blkcnt > XFS_QM_MAX_DQCLUSTER_LOGSZ) ?
XFS_QM_MAX_DQCLUSTER_LOGSZ : blkcnt;
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),
(int)XFS_QI_DQCHUNKLEN(mp), 0, &bp);
if (error)
break;
xfs_qm_reset_dqcounts(mp, bp, firstid, type);
xfs_bdwrite(mp, bp);
/*
* goto the next block.
*/
bno++;
firstid += XFS_QM_DQPERBLK(mp);
}
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(NULL, qip, lblkno,
maxlblkcnt - lblkno,
XFS_BMAPI_METADATA,
NULL,
0, map, &nmaps, NULL, NULL);
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 *
XFS_QM_DQPERBLK(mp);
/*
* 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_baread(mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, rablkno),
(int)XFS_QI_DQCHUNKLEN(mp));
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, XFS_DQITER_MAP_SIZE * sizeof(*map));
return error;
}
/*
* Called by dqusage_adjust in doing a quotacheck.
* Given the inode, and a dquot (either USR or GRP, doesn't matter),
* this updates its incore copy 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 void
xfs_qm_quotacheck_dqadjust(
xfs_dquot_t *dqp,
xfs_qcnt_t nblks,
xfs_qcnt_t rtblks)
{
ASSERT(XFS_DQ_IS_LOCKED(dqp));
xfs_dqtrace_entry(dqp, "QCHECK DQADJUST");
/*
* 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)
*/
if (! XFS_IS_SUSER_DQUOT(dqp)) {
xfs_qm_adjust_dqlimits(dqp->q_mount, &dqp->q_core);
xfs_qm_adjust_dqtimers(dqp->q_mount, &dqp->q_core);
}
dqp->dq_flags |= XFS_DQ_DIRTY;
}
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 */
void *private_data, /* not used */
xfs_daddr_t bno, /* starting block of inode cluster */
int *ubused, /* not used */
void *dip, /* on-disk inode pointer (not used) */
int *res) /* result code value */
{
xfs_inode_t *ip;
xfs_dquot_t *udqp, *gdqp;
xfs_qcnt_t nblks, rtblks;
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.
*/
if ((error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip, bno))) {
*res = BULKSTAT_RV_NOTHING;
return error;
}
/*
* Obtain the locked dquots. In case of an error (eg. allocation
* fails for ENOSPC), we return the negative of the error number
* to bulkstat, so that it can get propagated to quotacheck() and
* making us disable quotas for the file system.
*/
if ((error = xfs_qm_dqget_noattach(ip, &udqp, &gdqp))) {
xfs_iput(ip, XFS_ILOCK_EXCL);
*res = BULKSTAT_RV_GIVEUP;
return error;
}
rtblks = 0;
if (! XFS_IS_REALTIME_INODE(ip)) {
nblks = (xfs_qcnt_t)ip->i_d.di_nblocks;
} else {
/*
* Walk thru the extent list and count the realtime blocks.
*/
if ((error = xfs_qm_get_rtblks(ip, &rtblks))) {
xfs_iput(ip, XFS_ILOCK_EXCL);
if (udqp)
xfs_qm_dqput(udqp);
if (gdqp)
xfs_qm_dqput(gdqp);
*res = BULKSTAT_RV_GIVEUP;
return error;
}
nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
}
ASSERT(ip->i_delayed_blks == 0);
/*
* We can't release the inode while holding its dquot locks.
* The inode can go into inactive and might try to acquire the dquotlocks.
* So, just unlock here and do a vn_rele at the end.
*/
xfs_iunlock(ip, XFS_ILOCK_EXCL);
/*
* 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)) {
ASSERT(udqp);
xfs_qm_quotacheck_dqadjust(udqp, nblks, rtblks);
xfs_qm_dqput(udqp);
}
if (XFS_IS_OQUOTA_ON(mp)) {
ASSERT(gdqp);
xfs_qm_quotacheck_dqadjust(gdqp, nblks, rtblks);
xfs_qm_dqput(gdqp);
}
/*
* Now release the inode. This will send it to 'inactive', and
* possibly even free blocks.
*/
IRELE(ip);
/*
* Goto next inode.
*/
*res = BULKSTAT_RV_DIDONE;
return 0;
}
/*
* 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(XFS_QI_UQIP(mp) || XFS_QI_GQIP(mp));
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* There should be no cached dquots. The (simplistic) quotacheck
* algorithm doesn't like that.
*/
ASSERT(XFS_QI_MPLNDQUOTS(mp) == 0);
cmn_err(CE_NOTE, "XFS quotacheck %s: Please wait.", mp->m_fsname);
/*
* 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 = XFS_QI_UQIP(mp))) {
if ((error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA)))
goto error_return;
flags |= XFS_UQUOTA_CHKD;
}
if ((gip = XFS_QI_GQIP(mp))) {
if ((error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA)))
goto error_return;
flags |= XFS_OQUOTA_CHKD;
}
do {
/*
* Iterate thru all the inodes in the file system,
* adjusting the corresponding dquot counters in core.
*/
if ((error = xfs_bulkstat(mp, &lastino, &count,
xfs_qm_dqusage_adjust, NULL,
structsz, NULL, BULKSTAT_FG_IGET, &done)))
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, XFS_QMOPT_DELWRI);
/*
* 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 | XFS_QMOPT_QUOTAOFF);
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_bflush(mp->m_ddev_targp);
/*
* 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;
XQM_LIST_PRINT(&(XFS_QI_MPL_LIST(mp)), MPL_NEXT, "++++ Mp list +++");
error_return:
if (error) {
cmn_err(CE_WARN, "XFS quotacheck %s: Unsuccessful (Error %d): "
"Disabling quotas.",
mp->m_fsname, 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)) {
cmn_err(CE_WARN, "XFS quotacheck %s: "
"Failed to reset quota flags.", mp->m_fsname);
}
} else {
cmn_err(CE_NOTE, "XFS quotacheck %s: Done.", mp->m_fsname);
}
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, 0)))
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, 0))) {
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);
}
}
XFS_QI_UQIP(mp) = uip;
XFS_QI_GQIP(mp) = gip;
return 0;
}
/*
* 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 ...
* XXXsup merge this with qm_reclaim_one().
*/
STATIC int
xfs_qm_shake_freelist(
int howmany)
{
int nreclaimed;
xfs_dqhash_t *hash;
xfs_dquot_t *dqp, *nextdqp;
int restarts;
int nflushes;
if (howmany <= 0)
return 0;
nreclaimed = 0;
restarts = 0;
nflushes = 0;
#ifdef QUOTADEBUG
cmn_err(CE_DEBUG, "Shake free 0x%x", howmany);
#endif
/* lock order is : hashchainlock, freelistlock, mplistlock */
tryagain:
xfs_qm_freelist_lock(xfs_Gqm);
for (dqp = xfs_Gqm->qm_dqfreelist.qh_next;
((dqp != (xfs_dquot_t *) &xfs_Gqm->qm_dqfreelist) &&
nreclaimed < howmany); ) {
xfs_dqlock(dqp);
/*
* We are racing with dqlookup here. Naturally we don't
* want to reclaim a dquot that lookup wants.
*/
if (dqp->dq_flags & XFS_DQ_WANT) {
xfs_dqunlock(dqp);
xfs_qm_freelist_unlock(xfs_Gqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return nreclaimed;
XQM_STATS_INC(xqmstats.xs_qm_dqwants);
goto tryagain;
}
/*
* If the dquot is inactive, we are assured that it is
* not on the mplist or the hashlist, and that makes our
* life easier.
*/
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(dqp->MPL_PREVP == NULL);
XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
nextdqp = dqp->dq_flnext;
goto off_freelist;
}
ASSERT(dqp->MPL_PREVP);
/*
* 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_qm_dqflock_nowait(dqp)) {
xfs_dqunlock(dqp);
dqp = dqp->dq_flnext;
continue;
}
/*
* 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;
xfs_dqtrace_entry(dqp, "DQSHAKE: DQDIRTY");
/*
* We flush it delayed write, so don't bother
* releasing the mplock.
*/
error = xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
if (error) {
xfs_fs_cmn_err(CE_WARN, dqp->q_mount,
"xfs_qm_dqflush_all: dquot %p flush failed", dqp);
}
xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
dqp = dqp->dq_flnext;
continue;
}
/*
* We're trying to get the hashlock out of order. This races
* with dqlookup; so, we giveup and goto the next dquot if
* we couldn't get the hashlock. This way, we won't starve
* a dqlookup process that holds the hashlock that is
* waiting for the freelist lock.
*/
if (! xfs_qm_dqhashlock_nowait(dqp)) {
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
dqp = dqp->dq_flnext;
continue;
}
/*
* This races with dquot allocation code as well as dqflush_all
* and reclaim code. So, if we failed to grab the mplist lock,
* giveup everything and start over.
*/
hash = dqp->q_hash;
ASSERT(hash);
if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
/* XXX put a sentinel so that we can come back here */
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(hash);
xfs_qm_freelist_unlock(xfs_Gqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return nreclaimed;
goto tryagain;
}
xfs_dqtrace_entry(dqp, "DQSHAKE: UNLINKING");
#ifdef QUOTADEBUG
cmn_err(CE_DEBUG, "Shake 0x%p, ID 0x%x\n",
dqp, be32_to_cpu(dqp->q_core.d_id));
#endif
ASSERT(dqp->q_nrefs == 0);
nextdqp = dqp->dq_flnext;
XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(dqp->q_mount)), dqp);
XQM_HASHLIST_REMOVE(hash, dqp);
xfs_dqfunlock(dqp);
xfs_qm_mplist_unlock(dqp->q_mount);
XFS_DQ_HASH_UNLOCK(hash);
off_freelist:
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
nreclaimed++;
XQM_STATS_INC(xqmstats.xs_qm_dqshake_reclaims);
xfs_qm_dqdestroy(dqp);
dqp = nextdqp;
}
xfs_qm_freelist_unlock(xfs_Gqm);
return nreclaimed;
}
/*
* The kmem_shake interface is invoked when memory is running low.
*/
/* ARGSUSED */
STATIC int
xfs_qm_shake(int nr_to_scan, gfp_t gfp_mask)
{
int ndqused, nfree, n;
if (!kmem_shake_allow(gfp_mask))
return 0;
if (!xfs_Gqm)
return 0;
nfree = xfs_Gqm->qm_dqfreelist.qh_nelems; /* 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));
}
/*
* Just pop the least recently used dquot off the freelist and
* recycle it. The returned dquot is locked.
*/
STATIC xfs_dquot_t *
xfs_qm_dqreclaim_one(void)
{
xfs_dquot_t *dqpout;
xfs_dquot_t *dqp;
int restarts;
int nflushes;
restarts = 0;
dqpout = NULL;
nflushes = 0;
/* lockorder: hashchainlock, freelistlock, mplistlock, dqlock, dqflock */
startagain:
xfs_qm_freelist_lock(xfs_Gqm);
FOREACH_DQUOT_IN_FREELIST(dqp, &(xfs_Gqm->qm_dqfreelist)) {
xfs_dqlock(dqp);
/*
* We are racing with dqlookup here. Naturally we don't
* want to reclaim a dquot that lookup wants. We release the
* freelist lock and start over, so that lookup will grab
* both the dquot and the freelistlock.
*/
if (dqp->dq_flags & XFS_DQ_WANT) {
ASSERT(! (dqp->dq_flags & XFS_DQ_INACTIVE));
xfs_dqtrace_entry(dqp, "DQRECLAIM: DQWANT");
xfs_dqunlock(dqp);
xfs_qm_freelist_unlock(xfs_Gqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return NULL;
XQM_STATS_INC(xqmstats.xs_qm_dqwants);
goto startagain;
}
/*
* If the dquot is inactive, we are assured that it is
* not on the mplist or the hashlist, and that makes our
* life easier.
*/
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(dqp->MPL_PREVP == NULL);
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
dqpout = dqp;
XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
break;
}
ASSERT(dqp->q_hash);
ASSERT(dqp->MPL_PREVP);
/*
* 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_qm_dqflock_nowait(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/*
* 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;
xfs_dqtrace_entry(dqp, "DQRECLAIM: DQDIRTY");
/*
* We flush it delayed write, so don't bother
* releasing the freelist lock.
*/
error = xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
if (error) {
xfs_fs_cmn_err(CE_WARN, dqp->q_mount,
"xfs_qm_dqreclaim: dquot %p flush failed", dqp);
}
xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
continue;
}
if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
continue;
}
if (! xfs_qm_dqhashlock_nowait(dqp))
goto mplistunlock;
ASSERT(dqp->q_nrefs == 0);
xfs_dqtrace_entry(dqp, "DQRECLAIM: UNLINKING");
XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(dqp->q_mount)), dqp);
XQM_HASHLIST_REMOVE(dqp->q_hash, dqp);
XQM_FREELIST_REMOVE(dqp);
dqpout = dqp;
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
mplistunlock:
xfs_qm_mplist_unlock(dqp->q_mount);
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
if (dqpout)
break;
}
xfs_qm_freelist_unlock(xfs_Gqm);
return dqpout;
}
/*------------------------------------------------------------------*/
/*
* 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;
#ifdef QUOTADEBUG
cmn_err(CE_NOTE, "Writing superblock quota changes :%s", mp->m_fsname);
#endif
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 and gid (from cred_t) 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(
xfs_mount_t *mp,
xfs_inode_t *ip,
uid_t uid,
gid_t gid,
prid_t prid,
uint flags,
xfs_dquot_t **O_udqpp,
xfs_dquot_t **O_gdqpp)
{
int error;
xfs_dquot_t *uq, *gq;
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 = 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)) {
if ((error = xfs_qm_dqattach(ip, XFS_QMOPT_DQALLOC |
XFS_QMOPT_ILOCKED))) {
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 = ip->i_udquot;
xfs_dqlock(uq);
XFS_DQHOLD(uq);
xfs_dqunlock(uq);
}
}
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 = ip->i_gdquot;
xfs_dqlock(gq);
XFS_DQHOLD(gq);
xfs_dqunlock(gq);
}
} else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
if (ip->i_d.di_projid != 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 = ip->i_gdquot;
xfs_dqlock(gq);
XFS_DQHOLD(gq);
xfs_dqunlock(gq);
}
}
if (uq)
xfs_dqtrace_entry_ino(uq, "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.
*/
xfs_dqlock(newdq);
XFS_DQHOLD(newdq);
xfs_dqunlock(newdq);
*IO_olddq = 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)
{
int error;
xfs_mount_t *mp;
uint delblks, blkflags, prjflags = 0;
xfs_dquot_t *unresudq, *unresgdq, *delblksudq, *delblksgdq;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
mp = ip->i_mount;
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) &&
ip->i_d.di_projid != 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(
xfs_inode_t **i_tab)
{
xfs_inode_t *ip;
int i;
int error;
ip = i_tab[0];
if (! XFS_IS_QUOTA_ON(ip->i_mount))
return 0;
if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
error = xfs_qm_dqattach(ip, 0);
if (error)
return error;
}
for (i = 1; (i < 4 && i_tab[i]); i++) {
/*
* Watch out for duplicate entries in the table.
*/
if ((ip = i_tab[i]) != i_tab[i-1]) {
if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
error = xfs_qm_dqattach(ip, 0);
if (error)
return error;
}
}
}
return 0;
}
void
xfs_qm_vop_dqattach_and_dqmod_newinode(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t *udqp,
xfs_dquot_t *gdqp)
{
if (!XFS_IS_QUOTA_ON(tp->t_mountp))
return;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));
if (udqp) {
xfs_dqlock(udqp);
XFS_DQHOLD(udqp);
xfs_dqunlock(udqp);
ASSERT(ip->i_udquot == NULL);
ip->i_udquot = udqp;
ASSERT(XFS_IS_UQUOTA_ON(tp->t_mountp));
ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
}
if (gdqp) {
xfs_dqlock(gdqp);
XFS_DQHOLD(gdqp);
xfs_dqunlock(gdqp);
ASSERT(ip->i_gdquot == NULL);
ip->i_gdquot = gdqp;
ASSERT(XFS_IS_OQUOTA_ON(tp->t_mountp));
ASSERT((XFS_IS_GQUOTA_ON(tp->t_mountp) ?
ip->i_d.di_gid : ip->i_d.di_projid) ==
be32_to_cpu(gdqp->q_core.d_id));
xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
}
}
/* ------------- list stuff -----------------*/
STATIC void
xfs_qm_freelist_init(xfs_frlist_t *ql)
{
ql->qh_next = ql->qh_prev = (xfs_dquot_t *) ql;
mutex_init(&ql->qh_lock);
ql->qh_version = 0;
ql->qh_nelems = 0;
}
STATIC void
xfs_qm_freelist_destroy(xfs_frlist_t *ql)
{
xfs_dquot_t *dqp, *nextdqp;
mutex_lock(&ql->qh_lock);
for (dqp = ql->qh_next;
dqp != (xfs_dquot_t *)ql; ) {
xfs_dqlock(dqp);
nextdqp = dqp->dq_flnext;
#ifdef QUOTADEBUG
cmn_err(CE_DEBUG, "FREELIST destroy 0x%p", dqp);
#endif
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
xfs_qm_dqdestroy(dqp);
dqp = nextdqp;
}
mutex_unlock(&ql->qh_lock);
mutex_destroy(&ql->qh_lock);
ASSERT(ql->qh_nelems == 0);
}
STATIC void
xfs_qm_freelist_insert(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
dq->dq_flnext = ql->qh_next;
dq->dq_flprev = (xfs_dquot_t *)ql;
ql->qh_next = dq;
dq->dq_flnext->dq_flprev = dq;
xfs_Gqm->qm_dqfreelist.qh_nelems++;
xfs_Gqm->qm_dqfreelist.qh_version++;
}
void
xfs_qm_freelist_unlink(xfs_dquot_t *dq)
{
xfs_dquot_t *next = dq->dq_flnext;
xfs_dquot_t *prev = dq->dq_flprev;
next->dq_flprev = prev;
prev->dq_flnext = next;
dq->dq_flnext = dq->dq_flprev = dq;
xfs_Gqm->qm_dqfreelist.qh_nelems--;
xfs_Gqm->qm_dqfreelist.qh_version++;
}
void
xfs_qm_freelist_append(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
xfs_qm_freelist_insert((xfs_frlist_t *)ql->qh_prev, dq);
}
STATIC int
xfs_qm_dqhashlock_nowait(
xfs_dquot_t *dqp)
{
int locked;
locked = mutex_trylock(&((dqp)->q_hash->qh_lock));
return locked;
}
int
xfs_qm_freelist_lock_nowait(
xfs_qm_t *xqm)
{
int locked;
locked = mutex_trylock(&(xqm->qm_dqfreelist.qh_lock));
return locked;
}
STATIC int
xfs_qm_mplist_nowait(
xfs_mount_t *mp)
{
int locked;
ASSERT(mp->m_quotainfo);
locked = mutex_trylock(&(XFS_QI_MPLLOCK(mp)));
return locked;
}
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