patch-2.4.25 linux-2.4.25/fs/xfs/quota/xfs_qm.c
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- Lines: 2820
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/quota/xfs_qm.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/quota/xfs_qm.c linux-2.4.25/fs/xfs/quota/xfs_qm.c
@@ -0,0 +1,2819 @@
+/*
+ * 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_fs.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_clnt.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_dmapi.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_bit.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_rw.h"
+#include "xfs_acl.h"
+#include "xfs_cap.h"
+#include "xfs_mac.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;
+
+kmem_zone_t *qm_dqzone;
+kmem_zone_t *qm_dqtrxzone;
+kmem_shaker_t xfs_qm_shaker;
+
+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 int xfs_qm_shake(int, unsigned int);
+
+#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) 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); } \
+}
+#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_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;
+
+ 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;
+
+ xfs_qm_shaker = 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_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) {
+ if ((xfs_Gqm = xfs_Gqm_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)
+{
+ 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.
+ */
+int
+xfs_qm_mount_quotas(
+ xfs_mount_t *mp)
+{
+ unsigned long s;
+ int error = 0;
+ uint sbf;
+
+ /*
+ * If a file system had quotas running earlier, but decided to
+ * mount without -o quota/uquota/gquota options, revoke the
+ * quotachecked license, and bail out.
+ */
+ if (! XFS_IS_QUOTA_ON(mp) &&
+ (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
+
+ 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 = 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.
+ */
+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/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;
+}
+
+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_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);
+ }
+ 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 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));
+ }
+#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 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)
+{
+ 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_ISLOCKED_INODE_EXCL(ip));
+
+ 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_ISLOCKED_INODE_EXCL(ip));
+ if (XFS_IS_GQUOTA_ON(mp)) {
+ 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 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_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));
+ }
+ 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_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_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);
+ 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;
+ }
+}
+
+/*
+ * 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,
+ 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);
+ }
+ memset(&zerocr, 0, sizeof(zerocr));
+
+ if ((error = xfs_dir_ialloc(&tp, mp->m_rootip, S_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);
+ /*
+ * 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_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);
+ 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 */
+ 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, 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, NULL,
+ 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;
+
+ XQM_LIST_PRINT(&(XFS_QI_MPL_LIST(mp)), MPL_NEXT, "++++ Mp list +++");
+
+ error_return:
+ 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, &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 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_GQUOTA_ON(mp) && gip == NULL) {
+ 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
+ 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)) {
+ xfs_dqtrace_entry(dqp, "DQSHAKE: DQDIRTY");
+ /*
+ * 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);
+ goto tryagain;
+ }
+ xfs_dqtrace_entry(dqp, "DQSHAKE: UNLINKING");
+#ifdef QUOTADEBUG
+ cmn_err(CE_DEBUG, "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++;
+ 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, unsigned int 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)) {
+ xfs_dqtrace_entry(dqp, "DQRECLAIM: DQDIRTY");
+ /*
+ * 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())) {
+ 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);
+ (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;
+
+ 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, 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 flags)
+{
+ 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_bydquots(tp, ip->i_mount,
+ delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
+ flags | XFS_QMOPT_RES_REGBLKS)))
+ 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 | XFS_QMOPT_RES_REGBLKS)))
+ return (error);
+ xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
+ unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
+ XFS_QMOPT_RES_REGBLKS);
+ }
+
+ 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_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
+ cmn_err(CE_DEBUG, "FREELIST destroy 0x%p", 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++;
+}
+
+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);
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)