diff options
Diffstat (limited to 'fs/xfs/quota/xfs_dquot.c')
| -rw-r--r-- | fs/xfs/quota/xfs_dquot.c | 1648 |
1 files changed, 1648 insertions, 0 deletions
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c new file mode 100644 index 000000000000..740d20d33187 --- /dev/null +++ b/fs/xfs/quota/xfs_dquot.c @@ -0,0 +1,1648 @@ +/* + * Copyright (c) 2000-2003 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_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_trans_priv.h" + +#include "xfs_qm.h" + + +/* + LOCK ORDER + + inode lock (ilock) + dquot hash-chain lock (hashlock) + xqm dquot freelist lock (freelistlock + mount's dquot list lock (mplistlock) + user dquot lock - lock ordering among dquots is based on the uid or gid + group dquot lock - similar to udquots. Between the two dquots, the udquot + has to be locked first. + pin lock - the dquot lock must be held to take this lock. + flush lock - ditto. +*/ + +STATIC void xfs_qm_dqflush_done(xfs_buf_t *, xfs_dq_logitem_t *); + +#ifdef DEBUG +xfs_buftarg_t *xfs_dqerror_target; +int xfs_do_dqerror; +int xfs_dqreq_num; +int xfs_dqerror_mod = 33; +#endif + +/* + * Allocate and initialize a dquot. We don't always allocate fresh memory; + * we try to reclaim a free dquot if the number of incore dquots are above + * a threshold. + * The only field inside the core that gets initialized at this point + * is the d_id field. The idea is to fill in the entire q_core + * when we read in the on disk dquot. + */ +xfs_dquot_t * +xfs_qm_dqinit( + xfs_mount_t *mp, + xfs_dqid_t id, + uint type) +{ + xfs_dquot_t *dqp; + boolean_t brandnewdquot; + + brandnewdquot = xfs_qm_dqalloc_incore(&dqp); + dqp->dq_flags = type; + INT_SET(dqp->q_core.d_id, ARCH_CONVERT, id); + dqp->q_mount = mp; + + /* + * No need to re-initialize these if this is a reclaimed dquot. + */ + if (brandnewdquot) { + dqp->dq_flnext = dqp->dq_flprev = dqp; + mutex_init(&dqp->q_qlock, MUTEX_DEFAULT, "xdq"); + initnsema(&dqp->q_flock, 1, "fdq"); + sv_init(&dqp->q_pinwait, SV_DEFAULT, "pdq"); + +#ifdef XFS_DQUOT_TRACE + dqp->q_trace = ktrace_alloc(DQUOT_TRACE_SIZE, KM_SLEEP); + xfs_dqtrace_entry(dqp, "DQINIT"); +#endif + } else { + /* + * Only the q_core portion was zeroed in dqreclaim_one(). + * So, we need to reset others. + */ + dqp->q_nrefs = 0; + dqp->q_blkno = 0; + dqp->MPL_NEXT = dqp->HL_NEXT = NULL; + dqp->HL_PREVP = dqp->MPL_PREVP = NULL; + dqp->q_bufoffset = 0; + dqp->q_fileoffset = 0; + dqp->q_transp = NULL; + dqp->q_gdquot = NULL; + dqp->q_res_bcount = 0; + dqp->q_res_icount = 0; + dqp->q_res_rtbcount = 0; + dqp->q_pincount = 0; + dqp->q_hash = NULL; + ASSERT(dqp->dq_flnext == dqp->dq_flprev); + +#ifdef XFS_DQUOT_TRACE + ASSERT(dqp->q_trace); + xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT"); +#endif + } + + /* + * log item gets initialized later + */ + return (dqp); +} + +/* + * This is called to free all the memory associated with a dquot + */ +void +xfs_qm_dqdestroy( + xfs_dquot_t *dqp) +{ + ASSERT(! XFS_DQ_IS_ON_FREELIST(dqp)); + + mutex_destroy(&dqp->q_qlock); + freesema(&dqp->q_flock); + sv_destroy(&dqp->q_pinwait); + +#ifdef XFS_DQUOT_TRACE + if (dqp->q_trace) + ktrace_free(dqp->q_trace); + dqp->q_trace = NULL; +#endif + kmem_zone_free(xfs_Gqm->qm_dqzone, dqp); + atomic_dec(&xfs_Gqm->qm_totaldquots); +} + +/* + * This is what a 'fresh' dquot inside a dquot chunk looks like on disk. + */ +STATIC void +xfs_qm_dqinit_core( + xfs_dqid_t id, + uint type, + xfs_dqblk_t *d) +{ + /* + * Caller has zero'd the entire dquot 'chunk' already. + */ + INT_SET(d->dd_diskdq.d_magic, ARCH_CONVERT, XFS_DQUOT_MAGIC); + INT_SET(d->dd_diskdq.d_version, ARCH_CONVERT, XFS_DQUOT_VERSION); + INT_SET(d->dd_diskdq.d_id, ARCH_CONVERT, id); + INT_SET(d->dd_diskdq.d_flags, ARCH_CONVERT, type); +} + + +#ifdef XFS_DQUOT_TRACE +/* + * Dquot tracing for debugging. + */ +/* ARGSUSED */ +void +__xfs_dqtrace_entry( + xfs_dquot_t *dqp, + char *func, + void *retaddr, + xfs_inode_t *ip) +{ + xfs_dquot_t *udqp = NULL; + xfs_ino_t ino = 0; + + ASSERT(dqp->q_trace); + if (ip) { + ino = ip->i_ino; + udqp = ip->i_udquot; + } + ktrace_enter(dqp->q_trace, + (void *)(__psint_t)DQUOT_KTRACE_ENTRY, + (void *)func, + (void *)(__psint_t)dqp->q_nrefs, + (void *)(__psint_t)dqp->dq_flags, + (void *)(__psint_t)dqp->q_res_bcount, + (void *)(__psint_t)INT_GET(dqp->q_core.d_bcount, + ARCH_CONVERT), + (void *)(__psint_t)INT_GET(dqp->q_core.d_icount, + ARCH_CONVERT), + (void *)(__psint_t)INT_GET(dqp->q_core.d_blk_hardlimit, + ARCH_CONVERT), + (void *)(__psint_t)INT_GET(dqp->q_core.d_blk_softlimit, + ARCH_CONVERT), + (void *)(__psint_t)INT_GET(dqp->q_core.d_ino_hardlimit, + ARCH_CONVERT), + (void *)(__psint_t)INT_GET(dqp->q_core.d_ino_softlimit, + ARCH_CONVERT), + (void *)(__psint_t)INT_GET(dqp->q_core.d_id, ARCH_CONVERT), + (void *)(__psint_t)current_pid(), + (void *)(__psint_t)ino, + (void *)(__psint_t)retaddr, + (void *)(__psint_t)udqp); + return; +} +#endif + + +/* + * If default limits are in force, push them into the dquot now. + * We overwrite the dquot limits only if they are zero and this + * is not the root dquot. + */ +void +xfs_qm_adjust_dqlimits( + xfs_mount_t *mp, + xfs_disk_dquot_t *d) +{ + xfs_quotainfo_t *q = mp->m_quotainfo; + + ASSERT(d->d_id); + + if (q->qi_bsoftlimit && !d->d_blk_softlimit) + INT_SET(d->d_blk_softlimit, ARCH_CONVERT, q->qi_bsoftlimit); + if (q->qi_bhardlimit && !d->d_blk_hardlimit) + INT_SET(d->d_blk_hardlimit, ARCH_CONVERT, q->qi_bhardlimit); + if (q->qi_isoftlimit && !d->d_ino_softlimit) + INT_SET(d->d_ino_softlimit, ARCH_CONVERT, q->qi_isoftlimit); + if (q->qi_ihardlimit && !d->d_ino_hardlimit) + INT_SET(d->d_ino_hardlimit, ARCH_CONVERT, q->qi_ihardlimit); + if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit) + INT_SET(d->d_rtb_softlimit, ARCH_CONVERT, q->qi_rtbsoftlimit); + if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit) + INT_SET(d->d_rtb_hardlimit, ARCH_CONVERT, q->qi_rtbhardlimit); +} + +/* + * Check the limits and timers of a dquot and start or reset timers + * if necessary. + * This gets called even when quota enforcement is OFF, which makes our + * life a little less complicated. (We just don't reject any quota + * reservations in that case, when enforcement is off). + * We also return 0 as the values of the timers in Q_GETQUOTA calls, when + * enforcement's off. + * In contrast, warnings are a little different in that they don't + * 'automatically' get started when limits get exceeded. + */ +void +xfs_qm_adjust_dqtimers( + xfs_mount_t *mp, + xfs_disk_dquot_t *d) +{ + ASSERT(d->d_id); + +#ifdef QUOTADEBUG + if (INT_GET(d->d_blk_hardlimit, ARCH_CONVERT)) + ASSERT(INT_GET(d->d_blk_softlimit, ARCH_CONVERT) <= + INT_GET(d->d_blk_hardlimit, ARCH_CONVERT)); + if (INT_GET(d->d_ino_hardlimit, ARCH_CONVERT)) + ASSERT(INT_GET(d->d_ino_softlimit, ARCH_CONVERT) <= + INT_GET(d->d_ino_hardlimit, ARCH_CONVERT)); + if (INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT)) + ASSERT(INT_GET(d->d_rtb_softlimit, ARCH_CONVERT) <= + INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT)); +#endif + if (!d->d_btimer) { + if ((INT_GET(d->d_blk_softlimit, ARCH_CONVERT) && + (INT_GET(d->d_bcount, ARCH_CONVERT) >= + INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) || + (INT_GET(d->d_blk_hardlimit, ARCH_CONVERT) && + (INT_GET(d->d_bcount, ARCH_CONVERT) >= + INT_GET(d->d_blk_hardlimit, ARCH_CONVERT)))) { + INT_SET(d->d_btimer, ARCH_CONVERT, + get_seconds() + XFS_QI_BTIMELIMIT(mp)); + } + } else { + if ((!d->d_blk_softlimit || + (INT_GET(d->d_bcount, ARCH_CONVERT) < + INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) && + (!d->d_blk_hardlimit || + (INT_GET(d->d_bcount, ARCH_CONVERT) < + INT_GET(d->d_blk_hardlimit, ARCH_CONVERT)))) { + d->d_btimer = 0; + } + } + + if (!d->d_itimer) { + if ((INT_GET(d->d_ino_softlimit, ARCH_CONVERT) && + (INT_GET(d->d_icount, ARCH_CONVERT) >= + INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) || + (INT_GET(d->d_ino_hardlimit, ARCH_CONVERT) && + (INT_GET(d->d_icount, ARCH_CONVERT) >= + INT_GET(d->d_ino_hardlimit, ARCH_CONVERT)))) { + INT_SET(d->d_itimer, ARCH_CONVERT, + get_seconds() + XFS_QI_ITIMELIMIT(mp)); + } + } else { + if ((!d->d_ino_softlimit || + (INT_GET(d->d_icount, ARCH_CONVERT) < + INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) && + (!d->d_ino_hardlimit || + (INT_GET(d->d_icount, ARCH_CONVERT) < + INT_GET(d->d_ino_hardlimit, ARCH_CONVERT)))) { + d->d_itimer = 0; + } + } + + if (!d->d_rtbtimer) { + if ((INT_GET(d->d_rtb_softlimit, ARCH_CONVERT) && + (INT_GET(d->d_rtbcount, ARCH_CONVERT) >= + INT_GET(d->d_rtb_softlimit, ARCH_CONVERT))) || + (INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT) && + (INT_GET(d->d_rtbcount, ARCH_CONVERT) >= + INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT)))) { + INT_SET(d->d_rtbtimer, ARCH_CONVERT, + get_seconds() + XFS_QI_RTBTIMELIMIT(mp)); + } + } else { + if ((!d->d_rtb_softlimit || + (INT_GET(d->d_rtbcount, ARCH_CONVERT) < + INT_GET(d->d_rtb_softlimit, ARCH_CONVERT))) && + (!d->d_rtb_hardlimit || + (INT_GET(d->d_rtbcount, ARCH_CONVERT) < + INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT)))) { + d->d_rtbtimer = 0; + } + } +} + +/* + * Increment or reset warnings of a given dquot. + */ +int +xfs_qm_dqwarn( + xfs_disk_dquot_t *d, + uint flags) +{ + int warned; + + /* + * root's limits are not real limits. + */ + if (!d->d_id) + return (0); + + warned = 0; + if (INT_GET(d->d_blk_softlimit, ARCH_CONVERT) && + (INT_GET(d->d_bcount, ARCH_CONVERT) >= + INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) { + if (flags & XFS_QMOPT_DOWARN) { + INT_MOD(d->d_bwarns, ARCH_CONVERT, +1); + warned++; + } + } else { + if (!d->d_blk_softlimit || + (INT_GET(d->d_bcount, ARCH_CONVERT) < + INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) { + d->d_bwarns = 0; + } + } + + if (INT_GET(d->d_ino_softlimit, ARCH_CONVERT) > 0 && + (INT_GET(d->d_icount, ARCH_CONVERT) >= + INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) { + if (flags & XFS_QMOPT_DOWARN) { + INT_MOD(d->d_iwarns, ARCH_CONVERT, +1); + warned++; + } + } else { + if (!d->d_ino_softlimit || + (INT_GET(d->d_icount, ARCH_CONVERT) < + INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) { + d->d_iwarns = 0; + } + } +#ifdef QUOTADEBUG + if (INT_GET(d->d_iwarns, ARCH_CONVERT)) + cmn_err(CE_DEBUG, + "--------@@Inode warnings running : %Lu >= %Lu", + INT_GET(d->d_icount, ARCH_CONVERT), + INT_GET(d->d_ino_softlimit, ARCH_CONVERT)); + if (INT_GET(d->d_bwarns, ARCH_CONVERT)) + cmn_err(CE_DEBUG, + "--------@@Blks warnings running : %Lu >= %Lu", + INT_GET(d->d_bcount, ARCH_CONVERT), + INT_GET(d->d_blk_softlimit, ARCH_CONVERT)); +#endif + return (warned); +} + + +/* + * initialize a buffer full of dquots and log the whole thing + */ +STATIC void +xfs_qm_init_dquot_blk( + xfs_trans_t *tp, + xfs_mount_t *mp, + xfs_dqid_t id, + uint type, + xfs_buf_t *bp) +{ + xfs_dqblk_t *d; + int curid, i; + + ASSERT(tp); + ASSERT(XFS_BUF_ISBUSY(bp)); + ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); + + d = (xfs_dqblk_t *)XFS_BUF_PTR(bp); + + /* + * ID of the first dquot in the block - id's are zero based. + */ + curid = id - (id % XFS_QM_DQPERBLK(mp)); + ASSERT(curid >= 0); + memset(d, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp))); + for (i = 0; i < XFS_QM_DQPERBLK(mp); i++, d++, curid++) + xfs_qm_dqinit_core(curid, type, d); + xfs_trans_dquot_buf(tp, bp, + type & XFS_DQ_USER ? + XFS_BLI_UDQUOT_BUF : + XFS_BLI_GDQUOT_BUF); + xfs_trans_log_buf(tp, bp, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1); +} + + + +/* + * Allocate a block and fill it with dquots. + * This is called when the bmapi finds a hole. + */ +STATIC int +xfs_qm_dqalloc( + xfs_trans_t *tp, + xfs_mount_t *mp, + xfs_dquot_t *dqp, + xfs_inode_t *quotip, + xfs_fileoff_t offset_fsb, + xfs_buf_t **O_bpp) +{ + xfs_fsblock_t firstblock; + xfs_bmap_free_t flist; + xfs_bmbt_irec_t map; + int nmaps, error, committed; + xfs_buf_t *bp; + + ASSERT(tp != NULL); + xfs_dqtrace_entry(dqp, "DQALLOC"); + + /* + * Initialize the bmap freelist prior to calling bmapi code. + */ + XFS_BMAP_INIT(&flist, &firstblock); + xfs_ilock(quotip, XFS_ILOCK_EXCL); + /* + * Return if this type of quotas is turned off while we didn't + * have an inode lock + */ + if (XFS_IS_THIS_QUOTA_OFF(dqp)) { + xfs_iunlock(quotip, XFS_ILOCK_EXCL); + return (ESRCH); + } + + /* + * xfs_trans_commit normally decrements the vnode ref count + * when it unlocks the inode. Since we want to keep the quota + * inode around, we bump the vnode ref count now. + */ + VN_HOLD(XFS_ITOV(quotip)); + + xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL); + nmaps = 1; + if ((error = xfs_bmapi(tp, quotip, + offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB, + XFS_BMAPI_METADATA | XFS_BMAPI_WRITE, + &firstblock, + XFS_QM_DQALLOC_SPACE_RES(mp), + &map, &nmaps, &flist))) { + goto error0; + } + ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB); + ASSERT(nmaps == 1); + ASSERT((map.br_startblock != DELAYSTARTBLOCK) && + (map.br_startblock != HOLESTARTBLOCK)); + + /* + * Keep track of the blkno to save a lookup later + */ + dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); + + /* now we can just get the buffer (there's nothing to read yet) */ + bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, + dqp->q_blkno, + XFS_QI_DQCHUNKLEN(mp), + 0); + if (!bp || (error = XFS_BUF_GETERROR(bp))) + goto error1; + /* + * Make a chunk of dquots out of this buffer and log + * the entire thing. + */ + xfs_qm_init_dquot_blk(tp, mp, INT_GET(dqp->q_core.d_id, ARCH_CONVERT), + dqp->dq_flags & (XFS_DQ_USER|XFS_DQ_GROUP), + bp); + + if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed))) { + goto error1; + } + + *O_bpp = bp; + return 0; + + error1: + xfs_bmap_cancel(&flist); + error0: + xfs_iunlock(quotip, XFS_ILOCK_EXCL); + + return (error); +} + +/* + * Maps a dquot to the buffer containing its on-disk version. + * This returns a ptr to the buffer containing the on-disk dquot + * in the bpp param, and a ptr to the on-disk dquot within that buffer + */ +STATIC int +xfs_qm_dqtobp( + xfs_trans_t *tp, + xfs_dquot_t *dqp, + xfs_disk_dquot_t **O_ddpp, + xfs_buf_t **O_bpp, + uint flags) +{ + xfs_bmbt_irec_t map; + int nmaps, error; + xfs_buf_t *bp; + xfs_inode_t *quotip; + xfs_mount_t *mp; + xfs_disk_dquot_t *ddq; + xfs_dqid_t id; + boolean_t newdquot; + + mp = dqp->q_mount; + id = INT_GET(dqp->q_core.d_id, ARCH_CONVERT); + nmaps = 1; + newdquot = B_FALSE; + + /* + * If we don't know where the dquot lives, find out. + */ + if (dqp->q_blkno == (xfs_daddr_t) 0) { + /* We use the id as an index */ + dqp->q_fileoffset = (xfs_fileoff_t) ((uint)id / + XFS_QM_DQPERBLK(mp)); + nmaps = 1; + quotip = XFS_DQ_TO_QIP(dqp); + xfs_ilock(quotip, XFS_ILOCK_SHARED); + /* + * Return if this type of quotas is turned off while we didn't + * have an inode lock + */ + if (XFS_IS_THIS_QUOTA_OFF(dqp)) { + xfs_iunlock(quotip, XFS_ILOCK_SHARED); + return (ESRCH); + } + /* + * Find the block map; no allocations yet + */ + error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset, + XFS_DQUOT_CLUSTER_SIZE_FSB, + XFS_BMAPI_METADATA, + NULL, 0, &map, &nmaps, NULL); + + xfs_iunlock(quotip, XFS_ILOCK_SHARED); + if (error) + return (error); + ASSERT(nmaps == 1); + ASSERT(map.br_blockcount == 1); + + /* + * offset of dquot in the (fixed sized) dquot chunk. + */ + dqp->q_bufoffset = (id % XFS_QM_DQPERBLK(mp)) * + sizeof(xfs_dqblk_t); + if (map.br_startblock == HOLESTARTBLOCK) { + /* + * We don't allocate unless we're asked to + */ + if (!(flags & XFS_QMOPT_DQALLOC)) + return (ENOENT); + + ASSERT(tp); + if ((error = xfs_qm_dqalloc(tp, mp, dqp, quotip, + dqp->q_fileoffset, &bp))) + return (error); + newdquot = B_TRUE; + } else { + /* + * store the blkno etc so that we don't have to do the + * mapping all the time + */ + dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); + } + } + ASSERT(dqp->q_blkno != DELAYSTARTBLOCK); + ASSERT(dqp->q_blkno != HOLESTARTBLOCK); + + /* + * Read in the buffer, unless we've just done the allocation + * (in which case we already have the buf). + */ + if (! newdquot) { + xfs_dqtrace_entry(dqp, "DQTOBP READBUF"); + if ((error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, + dqp->q_blkno, + XFS_QI_DQCHUNKLEN(mp), + 0, &bp))) { + return (error); + } + if (error || !bp) + return XFS_ERROR(error); + } + ASSERT(XFS_BUF_ISBUSY(bp)); + ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); + + /* + * calculate the location of the dquot inside the buffer. + */ + ddq = (xfs_disk_dquot_t *)((char *)XFS_BUF_PTR(bp) + dqp->q_bufoffset); + + /* + * A simple sanity check in case we got a corrupted dquot... + */ + if (xfs_qm_dqcheck(ddq, id, + dqp->dq_flags & (XFS_DQ_USER|XFS_DQ_GROUP), + flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN), + "dqtobp")) { + if (!(flags & XFS_QMOPT_DQREPAIR)) { + xfs_trans_brelse(tp, bp); + return XFS_ERROR(EIO); + } + XFS_BUF_BUSY(bp); /* We dirtied this */ + } + + *O_bpp = bp; + *O_ddpp = ddq; + + return (0); +} + + +/* + * Read in the ondisk dquot using dqtobp() then copy it to an incore version, + * and release the buffer immediately. + * + */ +/* ARGSUSED */ +STATIC int +xfs_qm_dqread( + xfs_trans_t *tp, + xfs_dqid_t id, + xfs_dquot_t *dqp, /* dquot to get filled in */ + uint flags) +{ + xfs_disk_dquot_t *ddqp; + xfs_buf_t *bp; + int error; + + /* + * get a pointer to the on-disk dquot and the buffer containing it + * dqp already knows its own type (GROUP/USER). + */ + xfs_dqtrace_entry(dqp, "DQREAD"); + if ((error = xfs_qm_dqtobp(tp, dqp, &ddqp, &bp, flags))) { + return (error); + } + + /* copy everything from disk dquot to the incore dquot */ + memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t)); + ASSERT(INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == id); + xfs_qm_dquot_logitem_init(dqp); + + /* + * Reservation counters are defined as reservation plus current usage + * to avoid having to add everytime. + */ + dqp->q_res_bcount = INT_GET(ddqp->d_bcount, ARCH_CONVERT); + dqp->q_res_icount = INT_GET(ddqp->d_icount, ARCH_CONVERT); + dqp->q_res_rtbcount = INT_GET(ddqp->d_rtbcount, ARCH_CONVERT); + + /* Mark the buf so that this will stay incore a little longer */ + XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF); + + /* + * We got the buffer with a xfs_trans_read_buf() (in dqtobp()) + * So we need to release with xfs_trans_brelse(). + * The strategy here is identical to that of inodes; we lock + * the dquot in xfs_qm_dqget() before making it accessible to + * others. This is because dquots, like inodes, need a good level of + * concurrency, and we don't want to take locks on the entire buffers + * for dquot accesses. + * Note also that the dquot buffer may even be dirty at this point, if + * this particular dquot was repaired. We still aren't afraid to + * brelse it because we have the changes incore. + */ + ASSERT(XFS_BUF_ISBUSY(bp)); + ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); + xfs_trans_brelse(tp, bp); + + return (error); +} + + +/* + * allocate an incore dquot from the kernel heap, + * and fill its core with quota information kept on disk. + * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk + * if it wasn't already allocated. + */ +STATIC int +xfs_qm_idtodq( + xfs_mount_t *mp, + xfs_dqid_t id, /* gid or uid, depending on type */ + uint type, /* UDQUOT or GDQUOT */ + uint flags, /* DQALLOC, DQREPAIR */ + xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */ +{ + xfs_dquot_t *dqp; + int error; + xfs_trans_t *tp; + int cancelflags=0; + + dqp = xfs_qm_dqinit(mp, id, type); + tp = NULL; + if (flags & XFS_QMOPT_DQALLOC) { + tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC); + if ((error = xfs_trans_reserve(tp, + XFS_QM_DQALLOC_SPACE_RES(mp), + XFS_WRITE_LOG_RES(mp) + + BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1 + + 128, + 0, + XFS_TRANS_PERM_LOG_RES, + XFS_WRITE_LOG_COUNT))) { + cancelflags = 0; + goto error0; + } + cancelflags = XFS_TRANS_RELEASE_LOG_RES; + } + + /* + * Read it from disk; xfs_dqread() takes care of + * all the necessary initialization of dquot's fields (locks, etc) + */ + if ((error = xfs_qm_dqread(tp, id, dqp, flags))) { + /* + * This can happen if quotas got turned off (ESRCH), + * or if the dquot didn't exist on disk and we ask to + * allocate (ENOENT). + */ + xfs_dqtrace_entry(dqp, "DQREAD FAIL"); + cancelflags |= XFS_TRANS_ABORT; + goto error0; + } + if (tp) { + if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, + NULL))) + goto error1; + } + + *O_dqpp = dqp; + return (0); + + error0: + ASSERT(error); + if (tp) + xfs_trans_cancel(tp, cancelflags); + error1: + xfs_qm_dqdestroy(dqp); + *O_dqpp = NULL; + return (error); +} + +/* + * Lookup a dquot in the incore dquot hashtable. We keep two separate + * hashtables for user and group dquots; and, these are global tables + * inside the XQM, not per-filesystem tables. + * The hash chain must be locked by caller, and it is left locked + * on return. Returning dquot is locked. + */ +STATIC int +xfs_qm_dqlookup( + xfs_mount_t *mp, + xfs_dqid_t id, + xfs_dqhash_t *qh, + xfs_dquot_t **O_dqpp) +{ + xfs_dquot_t *dqp; + uint flist_locked; + xfs_dquot_t *d; + + ASSERT(XFS_DQ_IS_HASH_LOCKED(qh)); + + flist_locked = B_FALSE; + + /* + * Traverse the hashchain looking for a match + */ + for (dqp = qh->qh_next; dqp != NULL; dqp = dqp->HL_NEXT) { + /* + * We already have the hashlock. We don't need the + * dqlock to look at the id field of the dquot, since the + * id can't be modified without the hashlock anyway. + */ + if (INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == id && dqp->q_mount == mp) { + xfs_dqtrace_entry(dqp, "DQFOUND BY LOOKUP"); + /* + * All in core dquots must be on the dqlist of mp + */ + ASSERT(dqp->MPL_PREVP != NULL); + + xfs_dqlock(dqp); + if (dqp->q_nrefs == 0) { + ASSERT (XFS_DQ_IS_ON_FREELIST(dqp)); + if (! xfs_qm_freelist_lock_nowait(xfs_Gqm)) { + xfs_dqtrace_entry(dqp, "DQLOOKUP: WANT"); + + /* + * We may have raced with dqreclaim_one() + * (and lost). So, flag that we don't + * want the dquot to be reclaimed. + */ + dqp->dq_flags |= XFS_DQ_WANT; + xfs_dqunlock(dqp); + xfs_qm_freelist_lock(xfs_Gqm); + xfs_dqlock(dqp); + dqp->dq_flags &= ~(XFS_DQ_WANT); + } + flist_locked = B_TRUE; + } + + /* + * id couldn't have changed; we had the hashlock all + * along + */ + ASSERT(INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == id); + + if (flist_locked) { + if (dqp->q_nrefs != 0) { + xfs_qm_freelist_unlock(xfs_Gqm); + flist_locked = B_FALSE; + } else { + /* + * take it off the freelist + */ + xfs_dqtrace_entry(dqp, + "DQLOOKUP: TAKEOFF FL"); + XQM_FREELIST_REMOVE(dqp); + /* xfs_qm_freelist_print(&(xfs_Gqm-> + qm_dqfreelist), + "after removal"); */ + } + } + + /* + * grab a reference + */ + XFS_DQHOLD(dqp); + + if (flist_locked) + xfs_qm_freelist_unlock(xfs_Gqm); + /* + * move the dquot to the front of the hashchain + */ + ASSERT(XFS_DQ_IS_HASH_LOCKED(qh)); + if (dqp->HL_PREVP != &qh->qh_next) { + xfs_dqtrace_entry(dqp, + "DQLOOKUP: HASH MOVETOFRONT"); + if ((d = dqp->HL_NEXT)) + d->HL_PREVP = dqp->HL_PREVP; + *(dqp->HL_PREVP) = d; + d = qh->qh_next; + d->HL_PREVP = &dqp->HL_NEXT; + dqp->HL_NEXT = d; + dqp->HL_PREVP = &qh->qh_next; + qh->qh_next = dqp; + } + xfs_dqtrace_entry(dqp, "LOOKUP END"); + *O_dqpp = dqp; + ASSERT(XFS_DQ_IS_HASH_LOCKED(qh)); + return (0); + } + } + + *O_dqpp = NULL; + ASSERT(XFS_DQ_IS_HASH_LOCKED(qh)); + return (1); +} + +/* + * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a + * a locked dquot, doing an allocation (if requested) as needed. + * When both an inode and an id are given, the inode's id takes precedence. + * That is, if the id changes while we don't hold the ilock inside this + * function, the new dquot is returned, not necessarily the one requested + * in the id argument. + */ +int +xfs_qm_dqget( + xfs_mount_t *mp, + xfs_inode_t *ip, /* locked inode (optional) */ + xfs_dqid_t id, /* gid or uid, depending on type */ + uint type, /* UDQUOT or GDQUOT */ + uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */ + xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */ +{ + xfs_dquot_t *dqp; + xfs_dqhash_t *h; + uint version; + int error; + + ASSERT(XFS_IS_QUOTA_RUNNING(mp)); + if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) || + (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) { + return (ESRCH); + } + h = XFS_DQ_HASH(mp, id, type); + +#ifdef DEBUG + if (xfs_do_dqerror) { + if ((xfs_dqerror_target == mp->m_ddev_targp) && + (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) { + cmn_err(CE_DEBUG, "Returning error in dqget"); + return (EIO); + } + } +#endif + + again: + +#ifdef DEBUG + ASSERT(type == XFS_DQ_USER || type == XFS_DQ_GROUP); + if (ip) { + ASSERT(XFS_ISLOCKED_INODE_EXCL(ip)); + if (type == XFS_DQ_USER) + ASSERT(ip->i_udquot == NULL); + else + ASSERT(ip->i_gdquot == NULL); + } +#endif + XFS_DQ_HASH_LOCK(h); + + /* + * Look in the cache (hashtable). + * The chain is kept locked during lookup. + */ + if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) { + XQM_STATS_INC(xqmstats.xs_qm_dqcachehits); + /* + * The dquot was found, moved to the front of the chain, + * taken off the freelist if it was on it, and locked + * at this point. Just unlock the hashchain and return. + */ + ASSERT(*O_dqpp); + ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp)); + XFS_DQ_HASH_UNLOCK(h); + xfs_dqtrace_entry(*O_dqpp, "DQGET DONE (FROM CACHE)"); + return (0); /* success */ + } + XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses); + + /* + * Dquot cache miss. We don't want to keep the inode lock across + * a (potential) disk read. Also we don't want to deal with the lock + * ordering between quotainode and this inode. OTOH, dropping the inode + * lock here means dealing with a chown that can happen before + * we re-acquire the lock. + */ + if (ip) + xfs_iunlock(ip, XFS_ILOCK_EXCL); + /* + * Save the hashchain version stamp, and unlock the chain, so that + * we don't keep the lock across a disk read + */ + version = h->qh_version; + XFS_DQ_HASH_UNLOCK(h); + + /* + * Allocate the dquot on the kernel heap, and read the ondisk + * portion off the disk. Also, do all the necessary initialization + * 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_idtodq(mp, id, type, + flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR| + XFS_QMOPT_DOWARN), + &dqp))) { + if (ip) + xfs_ilock(ip, XFS_ILOCK_EXCL); + return (error); + } + + /* + * See if this is mount code calling to look at the overall quota limits + * which are stored in the id == 0 user or group's dquot. + * Since we may not have done a quotacheck by this point, just return + * the dquot without attaching it to any hashtables, lists, etc, or even + * taking a reference. + * The caller must dqdestroy this once done. + */ + if (flags & XFS_QMOPT_DQSUSER) { + ASSERT(id == 0); + ASSERT(! ip); + goto dqret; + } + + /* + * Dquot lock comes after hashlock in the lock ordering + */ + if (ip) { + xfs_ilock(ip, XFS_ILOCK_EXCL); + if (! XFS_IS_DQTYPE_ON(mp, type)) { + /* inode stays locked on return */ + xfs_qm_dqdestroy(dqp); + return XFS_ERROR(ESRCH); + } + /* + * A dquot could be attached to this inode by now, since + * we had dropped the ilock. + */ + if (type == XFS_DQ_USER) { + if (ip->i_udquot) { + xfs_qm_dqdestroy(dqp); + dqp = ip->i_udquot; + xfs_dqlock(dqp); + goto dqret; + } + } else { + if (ip->i_gdquot) { + xfs_qm_dqdestroy(dqp); + dqp = ip->i_gdquot; + xfs_dqlock(dqp); + goto dqret; + } + } + } + + /* + * Hashlock comes after ilock in lock order + */ + XFS_DQ_HASH_LOCK(h); + if (version != h->qh_version) { + xfs_dquot_t *tmpdqp; + /* + * Now, see if somebody else put the dquot in the + * hashtable before us. This can happen because we didn't + * keep the hashchain lock. We don't have to worry about + * lock order between the two dquots here since dqp isn't + * on any findable lists yet. + */ + if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) { + /* + * Duplicate found. Just throw away the new dquot + * and start over. + */ + xfs_qm_dqput(tmpdqp); + XFS_DQ_HASH_UNLOCK(h); + xfs_qm_dqdestroy(dqp); + XQM_STATS_INC(xqmstats.xs_qm_dquot_dups); + goto again; + } + } + + /* + * Put the dquot at the beginning of the hash-chain and mp's list + * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock .. + */ + ASSERT(XFS_DQ_IS_HASH_LOCKED(h)); + dqp->q_hash = h; + XQM_HASHLIST_INSERT(h, dqp); + + /* + * Attach this dquot to this filesystem's list of all dquots, + * kept inside the mount structure in m_quotainfo field + */ + xfs_qm_mplist_lock(mp); + + /* + * We return a locked dquot to the caller, with a reference taken + */ + xfs_dqlock(dqp); + dqp->q_nrefs = 1; + + XQM_MPLIST_INSERT(&(XFS_QI_MPL_LIST(mp)), dqp); + + xfs_qm_mplist_unlock(mp); + XFS_DQ_HASH_UNLOCK(h); + dqret: + ASSERT((ip == NULL) || XFS_ISLOCKED_INODE_EXCL(ip)); + xfs_dqtrace_entry(dqp, "DQGET DONE"); + *O_dqpp = dqp; + return (0); +} + + +/* + * Release a reference to the dquot (decrement ref-count) + * and unlock it. If there is a group quota attached to this + * dquot, carefully release that too without tripping over + * deadlocks'n'stuff. + */ +void +xfs_qm_dqput( + xfs_dquot_t *dqp) +{ + xfs_dquot_t *gdqp; + + ASSERT(dqp->q_nrefs > 0); + ASSERT(XFS_DQ_IS_LOCKED(dqp)); + xfs_dqtrace_entry(dqp, "DQPUT"); + + if (dqp->q_nrefs != 1) { + dqp->q_nrefs--; + xfs_dqunlock(dqp); + return; + } + + /* + * drop the dqlock and acquire the freelist and dqlock + * in the right order; but try to get it out-of-order first + */ + if (! xfs_qm_freelist_lock_nowait(xfs_Gqm)) { + xfs_dqtrace_entry(dqp, "DQPUT: FLLOCK-WAIT"); + xfs_dqunlock(dqp); + xfs_qm_freelist_lock(xfs_Gqm); + xfs_dqlock(dqp); + } + + while (1) { + gdqp = NULL; + + /* We can't depend on nrefs being == 1 here */ + if (--dqp->q_nrefs == 0) { + xfs_dqtrace_entry(dqp, "DQPUT: ON FREELIST"); + /* + * insert at end of the freelist. + */ + XQM_FREELIST_INSERT(&(xfs_Gqm->qm_dqfreelist), dqp); + + /* + * If we just added a udquot to the freelist, then + * we want to release the gdquot reference that + * it (probably) has. Otherwise it'll keep the + * gdquot from getting reclaimed. + */ + if ((gdqp = dqp->q_gdquot)) { + /* + * Avoid a recursive dqput call + */ + xfs_dqlock(gdqp); + dqp->q_gdquot = NULL; + } + + /* xfs_qm_freelist_print(&(xfs_Gqm->qm_dqfreelist), + "@@@@@++ Free list (after append) @@@@@+"); + */ + } + xfs_dqunlock(dqp); + + /* + * If we had a group quota inside the user quota as a hint, + * release it now. + */ + if (! gdqp) + break; + dqp = gdqp; + } + xfs_qm_freelist_unlock(xfs_Gqm); +} + +/* + * Release a dquot. Flush it if dirty, then dqput() it. + * dquot must not be locked. + */ +void +xfs_qm_dqrele( + xfs_dquot_t *dqp) +{ + ASSERT(dqp); + xfs_dqtrace_entry(dqp, "DQRELE"); + + xfs_dqlock(dqp); + /* + * We don't care to flush it if the dquot is dirty here. + * That will create stutters that we want to avoid. + * Instead we do a delayed write when we try to reclaim + * a dirty dquot. Also xfs_sync will take part of the burden... + */ + xfs_qm_dqput(dqp); +} + + +/* + * Write a modified dquot to disk. + * The dquot must be locked and the flush lock too taken by caller. + * The flush lock will not be unlocked until the dquot reaches the disk, + * but the dquot is free to be unlocked and modified by the caller + * in the interim. Dquot is still locked on return. This behavior is + * identical to that of inodes. + */ +int +xfs_qm_dqflush( + xfs_dquot_t *dqp, + uint flags) +{ + xfs_mount_t *mp; + xfs_buf_t *bp; + xfs_disk_dquot_t *ddqp; + int error; + SPLDECL(s); + + ASSERT(XFS_DQ_IS_LOCKED(dqp)); + ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp)); + xfs_dqtrace_entry(dqp, "DQFLUSH"); + + /* + * If not dirty, nada. + */ + if (!XFS_DQ_IS_DIRTY(dqp)) { + xfs_dqfunlock(dqp); + return (0); + } + + /* + * Cant flush a pinned dquot. Wait for it. + */ + xfs_qm_dqunpin_wait(dqp); + + /* + * This may have been unpinned because the filesystem is shutting + * down forcibly. If that's the case we must not write this dquot + * to disk, because the log record didn't make it to disk! + */ + if (XFS_FORCED_SHUTDOWN(dqp->q_mount)) { + dqp->dq_flags &= ~(XFS_DQ_DIRTY); + xfs_dqfunlock(dqp); + return XFS_ERROR(EIO); + } + + /* + * Get the buffer containing the on-disk dquot + * We don't need a transaction envelope because we know that the + * the ondisk-dquot has already been allocated for. + */ + if ((error = xfs_qm_dqtobp(NULL, dqp, &ddqp, &bp, XFS_QMOPT_DOWARN))) { + xfs_dqtrace_entry(dqp, "DQTOBP FAIL"); + ASSERT(error != ENOENT); + /* + * Quotas could have gotten turned off (ESRCH) + */ + xfs_dqfunlock(dqp); + return (error); + } + + if (xfs_qm_dqcheck(&dqp->q_core, INT_GET(ddqp->d_id, ARCH_CONVERT), 0, XFS_QMOPT_DOWARN, + "dqflush (incore copy)")) { + xfs_force_shutdown(dqp->q_mount, XFS_CORRUPT_INCORE); + return XFS_ERROR(EIO); + } + + /* This is the only portion of data that needs to persist */ + memcpy(ddqp, &(dqp->q_core), sizeof(xfs_disk_dquot_t)); + + /* + * Clear the dirty field and remember the flush lsn for later use. + */ + dqp->dq_flags &= ~(XFS_DQ_DIRTY); + mp = dqp->q_mount; + + /* lsn is 64 bits */ + AIL_LOCK(mp, s); + dqp->q_logitem.qli_flush_lsn = dqp->q_logitem.qli_item.li_lsn; + AIL_UNLOCK(mp, s); + + /* + * Attach an iodone routine so that we can remove this dquot from the + * AIL and release the flush lock once the dquot is synced to disk. + */ + xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t *, xfs_log_item_t *)) + xfs_qm_dqflush_done, &(dqp->q_logitem.qli_item)); + /* + * If the buffer is pinned then push on the log so we won't + * get stuck waiting in the write for too long. + */ + if (XFS_BUF_ISPINNED(bp)) { + xfs_dqtrace_entry(dqp, "DQFLUSH LOG FORCE"); + xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE); + } + + if (flags & XFS_QMOPT_DELWRI) { + xfs_bdwrite(mp, bp); + } else if (flags & XFS_QMOPT_ASYNC) { + xfs_bawrite(mp, bp); + } else { + error = xfs_bwrite(mp, bp); + } + xfs_dqtrace_entry(dqp, "DQFLUSH END"); + /* + * dqp is still locked, but caller is free to unlock it now. + */ + return (error); + +} + +/* + * This is the dquot flushing I/O completion routine. It is called + * from interrupt level when the buffer containing the dquot is + * flushed to disk. It is responsible for removing the dquot logitem + * from the AIL if it has not been re-logged, and unlocking the dquot's + * flush lock. This behavior is very similar to that of inodes.. + */ +/*ARGSUSED*/ +STATIC void +xfs_qm_dqflush_done( + xfs_buf_t *bp, + xfs_dq_logitem_t *qip) +{ + xfs_dquot_t *dqp; + SPLDECL(s); + + dqp = qip->qli_dquot; + + /* + * We only want to pull the item from the AIL if its + * location in the log has not changed since we started the flush. + * Thus, we only bother if the dquot's lsn has + * not changed. First we check the lsn outside the lock + * since it's cheaper, and then we recheck while + * holding the lock before removing the dquot from the AIL. + */ + if ((qip->qli_item.li_flags & XFS_LI_IN_AIL) && + qip->qli_item.li_lsn == qip->qli_flush_lsn) { + + AIL_LOCK(dqp->q_mount, s); + /* + * xfs_trans_delete_ail() drops the AIL lock. + */ + if (qip->qli_item.li_lsn == qip->qli_flush_lsn) + xfs_trans_delete_ail(dqp->q_mount, + (xfs_log_item_t*)qip, s); + else + AIL_UNLOCK(dqp->q_mount, s); + } + + /* + * Release the dq's flush lock since we're done with it. + */ + xfs_dqfunlock(dqp); +} + + +int +xfs_qm_dqflock_nowait( + xfs_dquot_t *dqp) +{ + int locked; + + locked = cpsema(&((dqp)->q_flock)); + + /* XXX ifdef these out */ + if (locked) + (dqp)->dq_flags |= XFS_DQ_FLOCKED; + return (locked); +} + + +int +xfs_qm_dqlock_nowait( + xfs_dquot_t *dqp) +{ + return (mutex_trylock(&((dqp)->q_qlock))); +} + +void +xfs_dqlock( + xfs_dquot_t *dqp) +{ + mutex_lock(&(dqp->q_qlock), PINOD); +} + +void +xfs_dqunlock( + xfs_dquot_t *dqp) +{ + mutex_unlock(&(dqp->q_qlock)); + if (dqp->q_logitem.qli_dquot == dqp) { + /* Once was dqp->q_mount, but might just have been cleared */ + xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_mountp, + (xfs_log_item_t*)&(dqp->q_logitem)); + } +} + + +void +xfs_dqunlock_nonotify( + xfs_dquot_t *dqp) +{ + mutex_unlock(&(dqp->q_qlock)); +} + +void +xfs_dqlock2( + xfs_dquot_t *d1, + xfs_dquot_t *d2) +{ + if (d1 && d2) { + ASSERT(d1 != d2); + if (INT_GET(d1->q_core.d_id, ARCH_CONVERT) > INT_GET(d2->q_core.d_id, ARCH_CONVERT)) { + xfs_dqlock(d2); + xfs_dqlock(d1); + } else { + xfs_dqlock(d1); + xfs_dqlock(d2); + } + } else { + if (d1) { + xfs_dqlock(d1); + } else if (d2) { + xfs_dqlock(d2); + } + } +} + + +/* + * Take a dquot out of the mount's dqlist as well as the hashlist. + * This is called via unmount as well as quotaoff, and the purge + * will always succeed unless there are soft (temp) references + * outstanding. + * + * This returns 0 if it was purged, 1 if it wasn't. It's not an error code + * that we're returning! XXXsup - not cool. + */ +/* ARGSUSED */ +int +xfs_qm_dqpurge( + xfs_dquot_t *dqp, + uint flags) +{ + xfs_dqhash_t *thishash; + xfs_mount_t *mp; + + mp = dqp->q_mount; + + ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp)); + ASSERT(XFS_DQ_IS_HASH_LOCKED(dqp->q_hash)); + + xfs_dqlock(dqp); + /* + * We really can't afford to purge a dquot that is + * referenced, because these are hard refs. + * It shouldn't happen in general because we went thru _all_ inodes in + * dqrele_all_inodes before calling this and didn't let the mountlock go. + * However it is possible that we have dquots with temporary + * references that are not attached to an inode. e.g. see xfs_setattr(). + */ + if (dqp->q_nrefs != 0) { + xfs_dqunlock(dqp); + XFS_DQ_HASH_UNLOCK(dqp->q_hash); + return (1); + } + + ASSERT(XFS_DQ_IS_ON_FREELIST(dqp)); + + /* + * If we're turning off quotas, we have to make sure that, for + * example, we don't delete quota disk blocks while dquots are + * in the process of getting written to those disk blocks. + * This dquot might well be on AIL, and we can't leave it there + * if we're turning off quotas. Basically, we need this flush + * lock, and are willing to block on it. + */ + if (! xfs_qm_dqflock_nowait(dqp)) { + /* + * Block on the flush lock after nudging dquot buffer, + * if it is incore. + */ + xfs_qm_dqflock_pushbuf_wait(dqp); + } + + /* + * XXXIf we're turning this type of quotas off, we don't care + * about the dirty metadata sitting in this dquot. OTOH, if + * we're unmounting, we do care, so we flush it and wait. + */ + if (XFS_DQ_IS_DIRTY(dqp)) { + xfs_dqtrace_entry(dqp, "DQPURGE ->DQFLUSH: DQDIRTY"); + /* dqflush unlocks dqflock */ + /* + * Given that dqpurge is a very rare occurrence, it is OK + * that we're holding the hashlist and mplist locks + * across the disk write. But, ... XXXsup + * + * We don't care about getting disk errors here. We need + * to purge this dquot anyway, so we go ahead regardless. + */ + (void) xfs_qm_dqflush(dqp, XFS_QMOPT_SYNC); + xfs_dqflock(dqp); + } + ASSERT(dqp->q_pincount == 0); + ASSERT(XFS_FORCED_SHUTDOWN(mp) || + !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL)); + + thishash = dqp->q_hash; + XQM_HASHLIST_REMOVE(thishash, dqp); + XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(mp)), dqp); + /* + * XXX Move this to the front of the freelist, if we can get the + * freelist lock. + */ + ASSERT(XFS_DQ_IS_ON_FREELIST(dqp)); + + dqp->q_mount = NULL; + dqp->q_hash = NULL; + dqp->dq_flags = XFS_DQ_INACTIVE; + memset(&dqp->q_core, 0, sizeof(dqp->q_core)); + xfs_dqfunlock(dqp); + xfs_dqunlock(dqp); + XFS_DQ_HASH_UNLOCK(thishash); + return (0); +} + + +#ifdef QUOTADEBUG +void +xfs_qm_dqprint(xfs_dquot_t *dqp) +{ + cmn_err(CE_DEBUG, "-----------KERNEL DQUOT----------------"); + cmn_err(CE_DEBUG, "---- dquotID = %d", + (int)INT_GET(dqp->q_core.d_id, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- type = %s", + XFS_QM_ISUDQ(dqp) ? "USR" : "GRP"); + cmn_err(CE_DEBUG, "---- fs = 0x%p", dqp->q_mount); + cmn_err(CE_DEBUG, "---- blkno = 0x%x", (int) dqp->q_blkno); + cmn_err(CE_DEBUG, "---- boffset = 0x%x", (int) dqp->q_bufoffset); + cmn_err(CE_DEBUG, "---- blkhlimit = %Lu (0x%x)", + INT_GET(dqp->q_core.d_blk_hardlimit, ARCH_CONVERT), + (int) INT_GET(dqp->q_core.d_blk_hardlimit, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- blkslimit = %Lu (0x%x)", + INT_GET(dqp->q_core.d_blk_softlimit, ARCH_CONVERT), + (int)INT_GET(dqp->q_core.d_blk_softlimit, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- inohlimit = %Lu (0x%x)", + INT_GET(dqp->q_core.d_ino_hardlimit, ARCH_CONVERT), + (int)INT_GET(dqp->q_core.d_ino_hardlimit, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- inoslimit = %Lu (0x%x)", + INT_GET(dqp->q_core.d_ino_softlimit, ARCH_CONVERT), + (int)INT_GET(dqp->q_core.d_ino_softlimit, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- bcount = %Lu (0x%x)", + INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT), + (int)INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- icount = %Lu (0x%x)", + INT_GET(dqp->q_core.d_icount, ARCH_CONVERT), + (int)INT_GET(dqp->q_core.d_icount, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- btimer = %d", + (int)INT_GET(dqp->q_core.d_btimer, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---- itimer = %d", + (int)INT_GET(dqp->q_core.d_itimer, ARCH_CONVERT)); + cmn_err(CE_DEBUG, "---------------------------"); +} +#endif + +/* + * Give the buffer a little push if it is incore and + * wait on the flush lock. + */ +void +xfs_qm_dqflock_pushbuf_wait( + xfs_dquot_t *dqp) +{ + xfs_buf_t *bp; + + /* + * 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. + */ + bp = xfs_incore(dqp->q_mount->m_ddev_targp, dqp->q_blkno, + XFS_QI_DQCHUNKLEN(dqp->q_mount), + XFS_INCORE_TRYLOCK); + if (bp != NULL) { + if (XFS_BUF_ISDELAYWRITE(bp)) { + if (XFS_BUF_ISPINNED(bp)) { + xfs_log_force(dqp->q_mount, + (xfs_lsn_t)0, + XFS_LOG_FORCE); + } + xfs_bawrite(dqp->q_mount, bp); + } else { + xfs_buf_relse(bp); + } + } + xfs_dqflock(dqp); +} |