File: [Development] / xfs-linux-nodel / Attic / xfs_qm.c (download)
Revision 1.84, Wed Oct 2 17:25:30 2002 UTC (15 years ago) by lord
Branch: MAIN
Changes since 1.83: +1 -1
lines
This is a two fold change, first it moves the translation
between linux dev_t and kdev_t up the call stack in xfs
and makes the bulk of xfs work in terms of its on disk
dev_t format. It also cleans up a few related chunks of
code.
The other part of the change reworks how we keep the linux
inode contents and the xfs inode fields in sync. A number
of places where we resynced the two have been removed, these
were basically replicating work elsewhere in the filesystem.
We now also ensure that the inode fields are filled in
before calling unlock_new_inode - there used to be a window.
Finally all the code which hooks together the linux inode
and the xfs inode is brought together as a more coherent
whole rather than being scattered around the inode create
path. Most calls to revalidate the linux inode from the
xfs inode are removed.
No need to feed in a dev_t here, we are creating a regular
file and we ignore the rdev field.
|
/*
* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include <xfs.h>
#include <xfs_quota_priv.h>
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_quotacheck(xfs_mount_t *);
STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC void xfs_qm_shake(void);
#ifdef DEBUG
extern mutex_t qcheck_lock;
#endif
#ifdef QUOTADEBUG
#define XQM_LIST_PRINT(l, NXT, title) \
{ \
xfs_dquot_t *dqp; int i = 0;\
printk("%s (#%d)\n", title, (int) (l)->qh_nelems); \
for (dqp = (l)->qh_next; dqp != NULL; dqp = dqp->NXT) { \
printk("\t%d.\t\"%d (%s)\"\t bcnt = %d, icnt = %d refs = %d\n", \
++i, (int) INT_GET(dqp->q_core.d_id, ARCH_CONVERT), \
DQFLAGTO_TYPESTR(dqp), \
(int) INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT), \
(int) INT_GET(dqp->q_core.d_icount, ARCH_CONVERT), \
(int) dqp->q_nrefs); } \
}
#endif
/*
* Initialize the XQM structure.
* Note that there is not one quota manager per file system.
*/
struct xfs_qm *
xfs_qm_init(void)
{
xfs_qm_t *xqm;
int hsize, i;
xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
ASSERT(xqm);
/*
* Initialize the dquot hash tables.
*/
hsize = (DQUOT_HASH_HEURISTIC < XFS_QM_NCSIZE_THRESHOLD) ?
XFS_QM_HASHSIZE_LOW : XFS_QM_HASHSIZE_HIGH;
xqm->qm_dqhashmask = hsize - 1;
/*
* XXXsup We could keep reference counts on usr and grp quotas
* inside XQM separately, and avoid having two hashtables even
* when only one 'type' is active in the system.
*/
xqm->qm_usr_dqhtable = (xfs_dqhash_t *)kmem_zalloc(hsize *
sizeof(xfs_dqhash_t),
KM_SLEEP);
xqm->qm_grp_dqhtable = (xfs_dqhash_t *)kmem_zalloc(hsize *
sizeof(xfs_dqhash_t),
KM_SLEEP);
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;
kmem_shake_register(xfs_qm_shake);
/*
* 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, MUTEX_DEFAULT, "qchk");
#endif
return (xqm);
}
/*
* Destroy the global quota manager when its reference count goes to zero.
*/
void
xfs_qm_destroy(
struct xfs_qm *xqm)
{
int hsize, i;
ASSERT(xqm != NULL);
ASSERT(xqm->qm_nrefs == 0);
kmem_shake_deregister(xfs_qm_shake);
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) {
if ((xfs_Gqm = xfs_qm_init()) == NULL) {
return (XFS_ERROR(EINVAL));
}
}
/*
* 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);
}
/*
* This is called at mount time from xfs_mountfs to initialize the quotainfo
* structure and start the global quotamanager (xfs_Gqm) if it hasn't done
* so already. Note that the superblock has not been read in yet.
*/
void
xfs_qm_mount_quotainit(
xfs_mount_t *mp,
uint flags)
{
/*
* User or group quotas has to be on.
*/
ASSERT(flags & (XFSMNT_UQUOTA | XFSMNT_GQUOTA));
/*
* Initialize the flags in the mount structure. From this point
* onwards we look at m_qflags to figure out if quotas's ON/OFF, etc.
* Note that we enforce nothing if accounting is off.
* ie. XFSMNT_*QUOTA must be ON for XFSMNT_*QUOTAENF.
* It isn't necessary to take the quotaoff lock to do this; this is
* called from mount.
*/
if (flags & XFSMNT_UQUOTA) {
mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
if (flags & XFSMNT_UQUOTAENF)
mp->m_qflags |= XFS_UQUOTA_ENFD;
}
if (flags & XFSMNT_GQUOTA) {
mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
if (flags & XFSMNT_GQUOTAENF)
mp->m_qflags |= XFS_GQUOTA_ENFD;
}
}
/*
* Just destroy the quotainfo structure.
*/
void
xfs_qm_unmount_quotadestroy(
xfs_mount_t *mp)
{
xfs_qm_destroy_quotainfo(mp);
}
/*
* This is called from xfs_mountfs to start quotas and initialize all
* necessary data structures like quotainfo, and in the rootfs's case
* xfs_Gqm. This is also responsible for running a quotacheck as necessary.
* We are guaranteed that the superblock is consistently read in at this
* point.
*/
int
xfs_qm_mount_quotas(
xfs_mount_t *mp)
{
unsigned long s;
int error;
uint sbf;
error = 0;
/*
* If a non-root file system had quotas running earlier, but decided
* to mount without -o quota/pquota options, revoke the quotachecked
* license, and bail out.
*/
if (! XFS_IS_QUOTA_ON(mp) &&
(mp->m_dev != rootdev) &&
(mp->m_sb.sb_qflags & (XFS_UQUOTA_ACCT|XFS_GQUOTA_ACCT))) {
mp->m_qflags = 0;
goto write_changes;
}
/*
* 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;
}
#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
cmn_err(CE_NOTE, "Attempting to turn on disk quotas.");
#endif
/*
* If this is the root file system, mark flags in mount struct first.
* We couldn't do this earlier because we didn't have the superblock
* read in.
*/
if (mp->m_dev == rootdev) {
ASSERT(XFS_SB_VERSION_HASQUOTA(&mp->m_sb));
ASSERT(mp->m_sb.sb_qflags &
(XFS_UQUOTA_ACCT|XFS_GQUOTA_ACCT));
if (xfs_Gqm == NULL) {
if ((xfs_Gqm = xfs_qm_init()) == NULL) {
mp->m_qflags = 0;
error = EINVAL;
goto write_changes;
}
}
mp->m_qflags = mp->m_sb.sb_qflags;
if (mp->m_qflags & XFS_UQUOTA_ACCT)
mp->m_qflags |= XFS_UQUOTA_ACTIVE;
if (mp->m_qflags & XFS_GQUOTA_ACCT)
mp->m_qflags |= XFS_GQUOTA_ACTIVE;
/*
* The quotainode of the root file system may or may not
* exist at this point.
*/
}
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* Allocate the quotainfo structure inside the mount struct, and
* create quotainode(s), and change/rev superblock if necessary.
*/
if ((error = xfs_qm_init_quotainfo(mp))) {
/*
* 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)) {
#ifdef DEBUG
cmn_err(CE_NOTE, "Doing a quotacheck. Please wait.");
#endif
if ((error = xfs_qm_quotacheck(mp))) {
cmn_err(CE_WARN, "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);
mp->m_qflags = 0;
goto write_changes;
}
#ifdef DEBUG
cmn_err(CE_NOTE, "Done quotacheck.");
#endif
}
write_changes:
/*
* We actually don't have to acquire the SB_LOCK at all.
* This can only be called from mount, and that's single threaded. XXX
*/
s = XFS_SB_LOCK(mp);
sbf = mp->m_sb.sb_qflags;
mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
XFS_SB_UNLOCK(mp, s);
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 XFS_ERROR(error);
}
/*
* Called from the vfsops layer.
*/
int
xfs_qm_unmount_quotas(
xfs_mount_t *mp)
{
xfs_inode_t *uqp, *gqp;
int error;
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);
if (mp->m_rootip->i_udquot || mp->m_rootip->i_gdquot)
xfs_qm_dqdettach_inode(mp->m_rootip);
if (mp->m_rbmip &&
(mp->m_rbmip->i_udquot || mp->m_rbmip->i_gdquot))
xfs_qm_dqdettach_inode(mp->m_rbmip);
if (mp->m_rsumip &&
(mp->m_rsumip->i_udquot || mp->m_rsumip->i_gdquot))
xfs_qm_dqdettach_inode(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 (error == EFSCORRUPTED)
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 (error == EFSCORRUPTED)
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.
*/
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);
/*
* If this is the root filesystem doing a quotacheck,
* we should do periodic bflushes. This is because there's
* no bflushd at this point.
*/
if (mp->m_flags & XFS_MOUNT_ROOTQCHECK) {
if (++niters == XFS_QM_MAX_DQCLUSTER_LOGSZ) {
xfs_log_force(mp, (xfs_lsn_t)0,
XFS_LOG_FORCE | XFS_LOG_SYNC);
XFS_bflush(mp->m_ddev_targp);
niters = 0;
}
}
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.
*/
int
xfs_qm_dqpurge_all(
xfs_mount_t *mp,
uint flags) /* QUOTAOFF/UMOUNTING/UQUOTA/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_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);
}
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_ISLOCKED_INODE_EXCL(ip));
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 XFS_DQ_GROUP. 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);
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) &&
(INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == 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);
}
/* XXX XFS_STATS */
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);
ASSERT(!udqhint || !XFS_DQ_IS_LOCKED(udqhint));
goto done;
}
if (! udqhint)
goto done;
ASSERT(udqhint);
ASSERT(dolock);
ASSERT(! XFS_DQ_IS_LOCKED(udqhint));
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));
else
ASSERT(! XFS_DQ_IS_LOCKED(udqhint));
}
if (! error) {
if (dolock)
ASSERT(XFS_DQ_IS_LOCKED(dqp));
else
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 contraints.
* 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));
} else {
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);
ASSERT(! XFS_DQ_IS_LOCKED(udq));
ASSERT(! XFS_DQ_IS_LOCKED(gdq));
xfs_dqlock(udq);
xfs_dqlock(gdq);
} else {
ASSERT(XFS_DQ_IS_LOCKED(udq));
if (! locked) {
ASSERT(! XFS_DQ_IS_LOCKED(gdq));
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 UQUOTAON / GQUOTAON
* in to 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)
{
int error;
xfs_mount_t *mp;
uint nquotas;
mp = ip->i_mount;
ASSERT(ip->i_ino != mp->m_sb.sb_uquotino &&
ip->i_ino != mp->m_sb.sb_gquotino);
ASSERT((flags & XFS_QMOPT_ILOCKED) == 0 ||
XFS_ISLOCKED_INODE_EXCL(ip));
nquotas = 0;
error = 0;
if (! (flags & XFS_QMOPT_ILOCKED))
xfs_ilock(ip, XFS_ILOCK_EXCL);
if (XFS_IS_UQUOTA_ON(mp)) {
if ((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)))
goto done;
nquotas++;
}
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
if (XFS_IS_GQUOTA_ON(mp)) {
if ((error = 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)))
/*
* Don't worry about the udquot that we may have
* attached above. It'll get dettached, if not already.
*/
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_ISLOCKED_INODE_EXCL(ip));
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));
else
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));
else
ASSERT(! XFS_DQ_IS_LOCKED(ip->i_gdquot));
}
if (XFS_IS_UQUOTA_ON(mp))
ASSERT(ip->i_udquot);
if (XFS_IS_GQUOTA_ON(mp))
ASSERT(ip->i_gdquot);
}
#endif
if (! (flags & XFS_QMOPT_ILOCKED))
xfs_iunlock(ip, XFS_ILOCK_EXCL);
#ifdef QUOTADEBUG
else
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
#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_dqdettach_inode(
xfs_inode_t *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_dqtrace_entry_ino(ip->i_udquot, "DQDETTACH", ip);
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;
}
}
int
xfs_qm_unmount(
xfs_mount_t *mp)
{
vnode_t *vp;
if (XFS_IS_UQUOTA_ON(mp)) {
vp = XFS_ITOV(XFS_QI_UQIP(mp));
VN_RELE(vp);
if (vn_count(vp) > 1)
cmn_err(CE_WARN, "UQUOTA busy vp=0x%x count=%d\n",
vp, vn_count(vp));
}
if (XFS_IS_GQUOTA_ON(mp)) {
vp = XFS_ITOV(XFS_QI_GQIP(mp));
VN_RELE(vp);
if (vn_count(vp) > 1)
cmn_err(CE_WARN, "GQUOTA busy vp=0x%x count=%d\n",
vp, vn_count(vp));
}
return (0);
}
/*
* This is called by xfs_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,
short flags)
{
int recl, restarts;
xfs_dquot_t *dqp;
uint flush_flags;
boolean_t nowait;
int error;
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,
* see if we can give a push to the buffer before we wait
* on the flush lock. At this point, we know that
* eventhough 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
*/
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);
}
spinlock_init(&qinf->qi_pinlock, "xfs_qinf_pin");
xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
qinf->qi_dqreclaims = 0;
/* mutex used to serialize quotaoffs */
mutex_init(&qinf->qi_quotaofflock, MUTEX_DEFAULT, "qoff");
/* 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_DQ_GROUP,
XFS_QMOPT_DQSUSER|XFS_QMOPT_DOWARN,
&dqp);
if (! error) {
/*
* 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 = INT_GET(dqp->q_core.d_btimer, ARCH_CONVERT) ?
INT_GET(dqp->q_core.d_btimer, ARCH_CONVERT) : XFS_QM_BTIMELIMIT;
qinf->qi_itimelimit = INT_GET(dqp->q_core.d_itimer, ARCH_CONVERT) ?
INT_GET(dqp->q_core.d_itimer, ARCH_CONVERT) : XFS_QM_ITIMELIMIT;
qinf->qi_rtbtimelimit = INT_GET(dqp->q_core.d_rtbtimer, ARCH_CONVERT) ?
INT_GET(dqp->q_core.d_rtbtimer, ARCH_CONVERT) : XFS_QM_RTBTIMELIMIT;
qinf->qi_bwarnlimit = INT_GET(dqp->q_core.d_bwarns, ARCH_CONVERT) ?
INT_GET(dqp->q_core.d_bwarns, ARCH_CONVERT) : XFS_QM_BWARNLIMIT;
qinf->qi_iwarnlimit = INT_GET(dqp->q_core.d_iwarns, ARCH_CONVERT) ?
INT_GET(dqp->q_core.d_iwarns, ARCH_CONVERT) : XFS_QM_IWARNLIMIT;
/*
* 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;
}
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, MUTEX_DEFAULT, str);
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_ISLOCKED_INODE_EXCL(ip));
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_GQUOTA_ON(mp)) {
ASSERT(ip->i_gdquot == NULL);
if (udqp)
xfs_dqunlock(udqp);
if ((error = xfs_qm_dqget(mp, ip, ip->i_d.di_gid, XFS_DQ_GROUP,
XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
&gdqp))) {
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;
unsigned long s;
cred_t zerocr;
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);
}
bzero(&zerocr, sizeof(zerocr));
if ((error = xfs_dir_ialloc(&tp, mp->m_rootip, IFREG, 1, 0,
&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_ISLOCKED_INODE_EXCL(*ip));
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.
*/
s = XFS_SB_LOCK(mp);
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;
XFS_SB_UNLOCK(mp, s);
xfs_mod_sb(tp, sbfields);
if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES,
NULL))) {
xfs_fs_cmn_err(CE_ALERT, mp, "XFS qino_alloc failed!");
return (error);
}
return (0);
}
STATIC int
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 unitialized dquot blks. See comment in xfs_qm_dqcheck.
*/
(void) xfs_qm_dqcheck(ddq, id+j, type, XFS_QMOPT_DQREPAIR,
"xfs_quotacheck");
INT_SET(ddq->d_bcount, ARCH_CONVERT, 0ULL);
INT_SET(ddq->d_icount, ARCH_CONVERT, 0ULL);
INT_SET(ddq->d_rtbcount, ARCH_CONVERT, 0ULL);
INT_SET(ddq->d_btimer, ARCH_CONVERT, (time_t)0);
INT_SET(ddq->d_itimer, ARCH_CONVERT, (time_t)0);
INT_SET(ddq->d_bwarns, ARCH_CONVERT, 0UL);
INT_SET(ddq->d_iwarns, ARCH_CONVERT, 0UL);
ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
}
return (0);
}
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;
ASSERT(blkcnt > 0);
notcommitted = 0;
incr = (blkcnt > XFS_QM_MAX_DQCLUSTER_LOGSZ) ?
XFS_QM_MAX_DQCLUSTER_LOGSZ : blkcnt;
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;
(void) xfs_qm_reset_dqcounts(mp, bp, firstid,
flags & XFS_QMOPT_UQUOTA ?
XFS_DQ_USER : XFS_DQ_GROUP);
xfs_bdwrite(mp, bp);
/*
* When quotachecking the root filesystem,
* we may not have bdflush, and we may fill
* up all available freebufs.
* The workaround here is to push on the
* log and do a bflush on the rootdev
* periodically.
*/
if (mp->m_flags & XFS_MOUNT_ROOTQCHECK) {
if (++notcommitted == incr) {
xfs_log_force(mp, (xfs_lsn_t)0,
XFS_LOG_FORCE | XFS_LOG_SYNC);
XFS_bflush(mp->m_ddev_targp);
notcommitted = 0;
}
}
/*
* goto the next block.
*/
bno++;
firstid += XFS_QM_DQPERBLK(mp);
}
return (error);
}
/*
* Iterate over all allocated USR/GRP 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 racey, 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_MAX_FILE_OFFSET);
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);
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.
*/
INT_MOD(dqp->q_core.d_icount, ARCH_CONVERT, +1);
dqp->q_res_icount++;
if (nblks) {
INT_MOD(dqp->q_core.d_bcount, ARCH_CONVERT, nblks);
dqp->q_res_bcount += nblks;
}
if (rtblks) {
INT_MOD(dqp->q_core.d_rtbcount, ARCH_CONVERT, rtblks);
dqp->q_res_rtbcount += rtblks;
}
/*
* Adjust the timers since we just changed usages
*/
if (! XFS_IS_SUSER_DQUOT(dqp))
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_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extent entries */
xfs_bmbt_rec_t *base; /* base of extent array */
xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
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 / sizeof(xfs_bmbt_rec_t);
base = &ifp->if_u1.if_extents[0];
for (ep = base; ep < &base[nextents]; ep++)
rtblks += xfs_bmbt_get_blockcount(ep);
*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_trans_t *tp, /* transaction pointer - NULL */
xfs_ino_t ino, /* inode number to get data for */
void *buffer, /* not used */
xfs_daddr_t bno, /* starting block of inode cluster */
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, tp, ino, XFS_ILOCK_EXCL, &ip, bno))) {
*res = BULKSTAT_RV_NOTHING;
return (error);
}
if (ip->i_d.di_mode == 0) {
xfs_iput_new(ip, XFS_ILOCK_EXCL);
*res = BULKSTAT_RV_NOTHING;
return XFS_ERROR(ENOENT);
}
/*
* 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 racey, 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_GQUOTA_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.
*/
VN_RELE(XFS_ITOV(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.
*/
STATIC 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, 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_QMOPT_GQUOTA)))
goto error_return;
flags |= XFS_GQUOTA_CHKD;
}
do {
/*
* Iterate thru all the inodes in the file system,
* adjusting the corresponding dquot counters in core.
*/
if ((error = xfs_bulkstat(mp, NULL, &lastino, &count,
xfs_qm_dqusage_adjust,
structsz, NULL,
BULKSTAT_FG_IGET|BULKSTAT_FG_VFSLOCKED,
&done)))
break;
} while (! done);
/*
* 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_UQUOTA|XFS_QMOPT_GQUOTA|
XFS_QMOPT_QUOTAOFF);
goto error_return;
}
/*
* We've made all the changes that we need to make incore.
* Now flush_them down to disk buffers.
*/
xfs_qm_dqflush_all(mp, XFS_QMOPT_DELWRI);
/*
* 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_GQUOTA_CHKD | XFS_UQUOTA_CHKD);
mp->m_qflags |= flags;
#ifdef QUOTADEBUG
XQM_LIST_PRINT(&(XFS_QI_MPL_LIST(mp)), MPL_NEXT, "++++ Mp list +++");
#endif
error_return:
cmn_err(CE_NOTE, "XFS quotacheck %s: Done.", mp->m_fsname);
mp->m_flags &= ~(XFS_MOUNT_ROOTQCHECK);
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, &uip, 0)))
return XFS_ERROR(error);
}
if (XFS_IS_GQUOTA_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, &gip, 0))) {
if (uip)
VN_RELE(XFS_ITOV(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 (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
return XFS_ERROR(EROFS);
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_GQUOTA_ON(mp) && gip == NULL) {
if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY) {
if (uip)
VN_RELE(XFS_ITOV(uip));
return XFS_ERROR(EROFS);
}
if ((error = xfs_qm_qino_alloc(mp, &gip,
sbflags | XFS_SB_GQUOTINO,
flags | XFS_QMOPT_GQUOTA))) {
if (uip)
VN_RELE(XFS_ITOV(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
printk("Shake free 0x%x\n", 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 != howmany);
XFS_STATS_INC(xfsstats.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);
XFS_STATS_INC(xfsstats.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)) {
xfs_dqtrace_entry(dqp, "DQSHAKE: DQDIRTY");
/*
* We'll be doing a dqflush, and it is
* possible to fill up the entire buffer cache
* with dirty delayed write buffers when doing
* this on a root filesystem, if bdflush isn't
* running. So, do a flush periodically.
*/
if (dqp->q_mount->m_flags & XFS_MOUNT_ROOTQCHECK) {
if (!(++nflushes % XFS_QM_MAX_DQCLUSTER_LOGSZ)){
xfs_log_force(dqp->q_mount, (xfs_lsn_t)0,
XFS_LOG_FORCE | XFS_LOG_SYNC);
XFS_bflush(dqp->q_mount->m_ddev_targp);
}
}
/*
* We flush it delayed write, so don't bother
* releasing the mplock.
*/
(void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
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 != howmany);
goto tryagain;
}
xfs_dqtrace_entry(dqp, "DQSHAKE: UNLINKING");
#ifdef QUOTADEBUG
printk("Shake 0x%p, ID 0x%x\n", dqp, INT_GET(dqp->q_core.d_id, ARCH_CONVERT));
#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++;
XFS_STATS_INC(xfsstats.xs_qm_dqshake_reclaims);
xfs_qm_dqdestroy(dqp);
dqp = nextdqp;
}
xfs_qm_freelist_unlock(xfs_Gqm);
return (nreclaimed != howmany);
}
/*
* The shake manager routine called by shaked() when memory is
* running low.
*/
/* ARGSUSED */
STATIC void
xfs_qm_shake(void)
{
int ndqused, nfree, n;
if (!xfs_Gqm)
return;
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;
ndqused *= xfs_Gqm->qm_dqfree_ratio; /* target # of free dquots */
n = nfree - ndqused - ndquot; /* # over target */
(void) 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);
XFS_STATS_INC(xfsstats.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;
XFS_STATS_INC(xfsstats.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)) {
xfs_dqtrace_entry(dqp, "DQRECLAIM: DQDIRTY");
/*
* We'll be doing a dqflush, and it is
* possible to fill up the entire buffer cache
* with dirty delayed write buffers when doing
* this on a root filesystem, if bdflush isn't
* running. So, do a flush periodically.
*/
if (dqp->q_mount->m_flags & XFS_MOUNT_ROOTQCHECK) {
if (!(++nflushes % XFS_QM_MAX_DQCLUSTER_LOGSZ)) {
xfs_log_force(dqp->q_mount, (xfs_lsn_t)0,
XFS_LOG_FORCE | XFS_LOG_SYNC);
XFS_bflush(dqp->q_mount->m_ddev_targp);
}
}
/*
* We flush it delayed write, so don't bother
* releasing the freelist lock.
*/
(void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
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())) {
XFS_STATS_INC(xfsstats.xs_qm_dqreclaims);
/*
* Just bzero the core here. The rest will get
* reinitialized by caller. XXX we shouldn't even
* do this bzero ...
*/
bzero(&dqp->q_core, sizeof(dqp->q_core));
*O_dqpp = dqp;
return (B_FALSE);
}
XFS_STATS_INC(xfsstats.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);
(void) xfs_trans_commit(tp, 0, NULL);
return (0);
}
/* --------------- 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,
uint flags,
xfs_dquot_t **O_udqpp,
xfs_dquot_t **O_gdqpp)
{
int error;
xfs_dquot_t *uq, *gq;
uint lockflags;
lockflags = XFS_ILOCK_EXCL;
xfs_ilock(ip, lockflags);
if ((flags & XFS_QMOPT_INHERIT) &&
XFS_INHERIT_GID(ip, XFS_MTOVFS(mp)))
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);
}
}
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;
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
/* old dquot */
prevdq = *IO_olddq;
ASSERT(prevdq);
ASSERT(prevdq != newdq);
xfs_trans_mod_dquot(tp, prevdq,
XFS_TRANS_DQ_BCOUNT,
-(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,
XFS_TRANS_DQ_BCOUNT,
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).
*/
int
xfs_qm_vop_chown_reserve(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t *udqp,
xfs_dquot_t *gdqp,
uint privileged)
{
int error;
xfs_mount_t *mp;
uint delblks;
xfs_dquot_t *unresudq, *unresgdq, *delblksudq, *delblksgdq;
ASSERT(XFS_ISLOCKED_INODE(ip));
mp = ip->i_mount;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
delblks = ip->i_delayed_blks;
delblksudq = delblksgdq = unresudq = unresgdq = NULL;
if (XFS_IS_UQUOTA_ON(mp) && udqp &&
ip->i_d.di_uid != (uid_t)INT_GET(udqp->q_core.d_id, ARCH_CONVERT)) {
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_GQUOTA_ON(ip->i_mount) && gdqp &&
ip->i_d.di_gid != INT_GET(gdqp->q_core.d_id, ARCH_CONVERT)) {
delblksgdq = gdqp;
if (delblks) {
ASSERT(ip->i_gdquot);
unresgdq = ip->i_gdquot;
}
}
if ((error = xfs_trans_reserve_quota(tp, delblksudq,
delblksgdq,
ip->i_d.di_nblocks, 1,
privileged)))
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(NULL,
delblksudq, delblksgdq,
(xfs_qcnt_t)delblks, 0,
privileged)))
return (error);
(void) xfs_trans_unreserve_quota(NULL,
unresudq, unresgdq,
(xfs_qcnt_t)delblks, 0,
0);
}
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_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)
{
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
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(ip->i_d.di_uid == INT_GET(udqp->q_core.d_id, ARCH_CONVERT));
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(ip->i_d.di_gid == INT_GET(gdqp->q_core.d_id, ARCH_CONVERT));
xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
}
}
/* ------------- list stuff -----------------*/
void
xfs_qm_freelist_init(xfs_frlist_t *ql)
{
ql->qh_next = ql->qh_prev = (xfs_dquot_t *) ql;
mutex_init(&ql->qh_lock, MUTEX_DEFAULT, "dqf");
ql->qh_version = 0;
ql->qh_nelems = 0;
}
void
xfs_qm_freelist_destroy(xfs_frlist_t *ql)
{
xfs_dquot_t *dqp, *nextdqp;
mutex_lock(&ql->qh_lock, PINOD);
for (dqp = ql->qh_next;
dqp != (xfs_dquot_t *)ql; ) {
xfs_dqlock(dqp);
nextdqp = dqp->dq_flnext;
#ifdef QUOTADEBUG
printk("FREELIST destroy 0x%p\n", dqp);
#endif
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
xfs_qm_dqdestroy(dqp);
dqp = nextdqp;
}
/*
* Don't bother about unlocking.
*/
mutex_destroy(&ql->qh_lock);
ASSERT(ql->qh_nelems == 0);
}
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++;
}
#ifdef QUOTADEBUG
void
xfs_qm_freelist_print(xfs_frlist_t *qlist, char *title)
{
xfs_dquot_t *dq;
int i = 0;
printk("%s (#%d)\n", title, (int) qlist->qh_nelems);
FOREACH_DQUOT_IN_FREELIST(dq, qlist) {
printk("\t%d.\t\"%d (%s:0x%p)\"\t bcnt = %d, icnt = %d "
"refs = %d\n",
++i, INT_GET(dq->q_core.d_id, ARCH_CONVERT),
DQFLAGTO_TYPESTR(dq), dq,
(int) INT_GET(dq->q_core.d_bcount, ARCH_CONVERT),
(int) INT_GET(dq->q_core.d_icount, ARCH_CONVERT),
(int) dq->q_nrefs);
}
}
#endif
void
xfs_qm_freelist_append(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
xfs_qm_freelist_insert((xfs_frlist_t *)ql->qh_prev, dq);
}
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);
}
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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