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Message-ID: <537DD5BA.1050105@gmail.com> Date: Thu, 22 May 2014 18:47:22 +0800 From: Niu Yawei <yawei.niu@...il.com> To: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org CC: yawei.niu@...el.com, andreas.dilger@...el.com, jack@...e.cz, lai.siyao@...el.com Subject: [PATCH] quota: remove dqptr_sem for scalability There are several global locks in the VFS quota code which hurts performance a lot when quota accounting enabled, dqptr_sem is the major one. This patch tries to make the VFS quota code scalable with minimal changes. Following tests (mdtest & dbench) were running over ext4 fs in a centos6.5 vm (8 cpus, 4G mem, kenrel: 3.15.0-rc5+), and the result shows the patch relieved the lock congestion a lot. === mdtest (http://sourceforge.net/projects/mdtest/) mdtest creation: threads 1 2 4 8 16 disabled quota: 40045 78379 128652 89176 103666 enabled quota: 34939 46725 24095 14321 16510 patched/disabled: 39120 75325 124181 72012 86622 patched/enabled: 34769 67086 111854 85923 87982 mdtest unlink: threads 1 2 4 8 16 disabled quota: 91587 148808 227496 193661 190477 enabled quota: 72426 48726 14845 12825 15907 patched/disabled: 85246 146369 228514 194053 192407 patched/enabled: 78257 124332 166146 180874 174715 === dbench test (8 threads) disabled quota: Operation Count AvgLat MaxLat -------------------------------------------------- Deltree 32 3.585 8.437 Flush 82625 3.797 207.561 Close 865785 0.004 1.353 LockX 3840 0.005 0.182 Mkdir 16 0.005 0.007 Rename 49897 0.050 6.085 ReadX 1847719 0.006 6.332 WriteX 588019 0.033 6.968 Unlink 238061 0.050 6.537 UnlockX 3840 0.004 0.302 FIND_FIRST 413054 0.024 2.920 SET_FILE_INFORMATION 95961 0.035 6.998 QUERY_FILE_INFORMATION 187253 0.003 0.478 QUERY_PATH_INFORMATION 1068225 0.010 6.211 QUERY_FS_INFORMATION 195932 0.006 0.541 NTCreateX 1178614 0.021 64.684 Throughput 616.998 MB/sec 8 clients 8 procs max_latency=207.575 ms enabled quota: Operation Count AvgLat MaxLat -------------------------------------------------- Deltree 16 11.240 54.888 Flush 61421 3.627 127.876 Close 643369 0.004 0.924 LockX 2848 0.005 0.253 Mkdir 8 0.005 0.008 Rename 37088 0.116 3.845 ReadX 1372315 0.007 5.024 WriteX 435537 0.106 18.304 Unlink 176928 0.351 29.266 UnlockX 2848 0.004 0.095 FIND_FIRST 306847 0.024 1.689 SET_FILE_INFORMATION 71406 0.040 8.933 QUERY_FILE_INFORMATION 138904 0.003 0.421 QUERY_PATH_INFORMATION 794000 0.011 4.027 QUERY_FS_INFORMATION 145520 0.006 0.473 NTCreateX 875964 0.072 52.923 Throughput 457.433 MB/sec 8 clients 8 procs max_latency=127.902 ms patched/disabled: Operation Count AvgLat MaxLat -------------------------------------------------- Deltree 32 3.332 8.210 Flush 82543 3.790 146.987 Close 865200 0.004 1.289 LockX 3836 0.005 0.142 Mkdir 16 0.008 0.038 Rename 49870 0.052 4.907 ReadX 1846334 0.006 6.107 WriteX 587645 0.033 8.086 Unlink 237737 0.052 6.440 UnlockX 3836 0.004 0.105 FIND_FIRST 412704 0.024 1.597 SET_FILE_INFORMATION 95948 0.034 7.854 QUERY_FILE_INFORMATION 187179 0.003 0.408 QUERY_PATH_INFORMATION 1067460 0.010 5.316 QUERY_FS_INFORMATION 195706 0.006 0.613 NTCreateX 1177689 0.021 6.521 Throughput 616.574 MB/sec 8 clients 8 procs max_latency=147.007 ms patched/enabled: Operation Count AvgLat MaxLat -------------------------------------------------- Deltree 32 3.248 8.430 Flush 80481 3.908 241.537 Close 843781 0.004 0.561 LockX 3746 0.005 0.141 Mkdir 16 0.005 0.007 Rename 48642 0.051 6.466 ReadX 1800754 0.006 87.027 WriteX 573185 0.033 6.750 Unlink 231880 0.058 14.507 UnlockX 3746 0.004 0.103 FIND_FIRST 402463 0.024 1.342 SET_FILE_INFORMATION 93557 0.035 42.348 QUERY_FILE_INFORMATION 182573 0.003 1.305 QUERY_PATH_INFORMATION 1041026 0.010 86.289 QUERY_FS_INFORMATION 190869 0.006 1.240 NTCreateX 1148570 0.022 6.285 Throughput 602.147 MB/sec 8 clients 8 procs max_latency=241.561 ms [PATCH] quota: remove dqptr_sem for scalability Remove dqptr_sem (but kept in struct quota_info to keep kernel ABI unchanged), and the functionality of this lock is implemented by other locks: * i_dquot is protected by i_lock, however only this pointer, the content of this struct is by dq_data_lock. * Q_GETFMT is now protected with dqonoff_mutex instead of dqptr_sem. * Small changes in __dquot_initialize() to avoid unnecessary dqget()/dqput() calls. Signed-off-by: Lai Siyao <lai.siyao@...el.com> Signed-off-by: Niu Yawei <yawei.niu@...el.com> --- fs/quota/dquot.c | 171 ++++++++++++++++++++++++++------------------------- fs/quota/quota.c | 6 +- fs/stat.c | 7 ++- fs/super.c | 1 - include/linux/fs.h | 1 + 5 files changed, 97 insertions(+), 89 deletions(-) diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 9cd5f63..99394b2 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -83,26 +83,21 @@ /* * There are three quota SMP locks. dq_list_lock protects all lists with quotas * and quota formats. - * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and - * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. - * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly - * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects - * modifications of quota state (on quotaon and quotaoff) and readers who care - * about latest values take it as well. - * - * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, + * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures. + * dq_state_lock protects modifications of quota state (on quotaon and quotaoff) + * and readers who care about latest values take it as well. + * + * The spinlock ordering is hence: i_lock > dq_data_lock > dq_list_lock, * dq_list_lock > dq_state_lock * * Note that some things (eg. sb pointer, type, id) doesn't change during * the life of the dquot structure and so needn't to be protected by a lock * - * Any operation working on dquots via inode pointers must hold dqptr_sem. If - * operation is just reading pointers from inode (or not using them at all) the - * read lock is enough. If pointers are altered function must hold write lock. + * Any operation working on dquots via inode pointers must hold i_lock. * Special care needs to be taken about S_NOQUOTA inode flag (marking that * inode is a quota file). Functions adding pointers from inode to dquots have - * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they - * have to do all pointer modifications before dropping dqptr_sem. This makes + * to check this flag under i_lock and then (if S_NOQUOTA is not set) they + * have to do all pointer modifications before dropping i_lock. This makes * sure they cannot race with quotaon which first sets S_NOQUOTA flag and * then drops all pointers to dquots from an inode. * @@ -116,16 +111,9 @@ * spinlock to internal buffers before writing. * * Lock ordering (including related VFS locks) is the following: - * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock > - * dqio_mutex + * i_mutex > dqonoff_sem > journal_lock > dquot->dq_lock > dqio_mutex * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc. - * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > - * dqptr_sem. But filesystem has to count with the fact that functions such as - * dquot_alloc_space() acquire dqptr_sem and they usually have to be called - * from inside a transaction to keep filesystem consistency after a crash. Also - * filesystems usually want to do some IO on dquot from ->mark_dirty which is - * called with dqptr_sem held. - */ + */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); @@ -974,7 +962,6 @@ static inline int dqput_blocks(struct dquot *dquot) /* * Remove references to dquots from inode and add dquot to list for freeing * if we have the last reference to dquot - * We can't race with anybody because we hold dqptr_sem for writing... */ static int remove_inode_dquot_ref(struct inode *inode, int type, struct list_head *tofree_head) @@ -1035,13 +1022,15 @@ static void remove_dquot_ref(struct super_block *sb, int type, * We have to scan also I_NEW inodes because they can already * have quota pointer initialized. Luckily, we need to touch * only quota pointers and these have separate locking - * (dqptr_sem). + * (i_lock). */ + spin_lock(&inode->i_lock); if (!IS_NOQUOTA(inode)) { if (unlikely(inode_get_rsv_space(inode) > 0)) reserved = 1; remove_inode_dquot_ref(inode, type, tofree_head); } + spin_unlock(&inode->i_lock); } spin_unlock(&inode_sb_list_lock); #ifdef CONFIG_QUOTA_DEBUG @@ -1059,9 +1048,7 @@ static void drop_dquot_ref(struct super_block *sb, int type) LIST_HEAD(tofree_head); if (sb->dq_op) { - down_write(&sb_dqopt(sb)->dqptr_sem); remove_dquot_ref(sb, type, &tofree_head); - up_write(&sb_dqopt(sb)->dqptr_sem); put_dquot_list(&tofree_head); } } @@ -1392,25 +1379,27 @@ static int dquot_active(const struct inode *inode) /* * Initialize quota pointers in inode * - * We do things in a bit complicated way but by that we avoid calling - * dqget() and thus filesystem callbacks under dqptr_sem. - * * It is better to call this function outside of any transaction as it * might need a lot of space in journal for dquot structure allocation. */ static void __dquot_initialize(struct inode *inode, int type) { - int cnt; - struct dquot *got[MAXQUOTAS]; + int cnt, dq_get = 0; + struct dquot *got[MAXQUOTAS] = { NULL, NULL }; struct super_block *sb = inode->i_sb; qsize_t rsv; - /* First test before acquiring mutex - solves deadlocks when we - * re-enter the quota code and are already holding the mutex */ if (!dquot_active(inode)) return; - /* First get references to structures we might need. */ + /* In most case, the i_dquot should have been initialized, except + * the newly allocated one. We'd always try to skip the dqget() and + * dqput() calls to avoid unnecessary global lock contention. */ + if (!(inode->i_state & I_NEW)) + goto init_idquot; + +get_dquots: + dq_get = 1; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { struct kqid qid; got[cnt] = NULL; @@ -1426,8 +1415,8 @@ static void __dquot_initialize(struct inode *inode, int type) } got[cnt] = dqget(sb, qid); } - - down_write(&sb_dqopt(sb)->dqptr_sem); +init_idquot: + spin_lock(&inode->i_lock); if (IS_NOQUOTA(inode)) goto out_err; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { @@ -1437,9 +1426,13 @@ static void __dquot_initialize(struct inode *inode, int type) if (!sb_has_quota_active(sb, cnt)) continue; /* We could race with quotaon or dqget() could have failed */ - if (!got[cnt]) + if (!got[cnt] && dq_get) continue; if (!inode->i_dquot[cnt]) { + if (dq_get == 0) { + spin_unlock(&inode->i_lock); + goto get_dquots; + } inode->i_dquot[cnt] = got[cnt]; got[cnt] = NULL; /* @@ -1455,7 +1448,7 @@ static void __dquot_initialize(struct inode *inode, int type) } } out_err: - up_write(&sb_dqopt(sb)->dqptr_sem); + spin_unlock(&inode->i_lock); /* Drop unused references */ dqput_all(got); } @@ -1474,12 +1467,12 @@ static void __dquot_drop(struct inode *inode) int cnt; struct dquot *put[MAXQUOTAS]; - down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&inode->i_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { put[cnt] = inode->i_dquot[cnt]; inode->i_dquot[cnt] = NULL; } - up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_unlock(&inode->i_lock); dqput_all(put); } @@ -1519,36 +1512,57 @@ static qsize_t *inode_reserved_space(struct inode * inode) return inode->i_sb->dq_op->get_reserved_space(inode); } +static inline void __inode_add_rsv_space(struct inode *inode, qsize_t number) +{ + *inode_reserved_space(inode) += number; +} + void inode_add_rsv_space(struct inode *inode, qsize_t number) { spin_lock(&inode->i_lock); - *inode_reserved_space(inode) += number; + __inode_add_rsv_space(inode, number); spin_unlock(&inode->i_lock); } EXPORT_SYMBOL(inode_add_rsv_space); +static inline void __inode_claim_rsv_space(struct inode *inode, qsize_t number) +{ + *inode_reserved_space(inode) -= number; + __inode_add_bytes(inode, number); +} + void inode_claim_rsv_space(struct inode *inode, qsize_t number) { spin_lock(&inode->i_lock); - *inode_reserved_space(inode) -= number; - __inode_add_bytes(inode, number); + __inode_claim_rsv_space(inode, number); spin_unlock(&inode->i_lock); } EXPORT_SYMBOL(inode_claim_rsv_space); -void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) +static inline void __inode_reclaim_rsv_space(struct inode *inode, + qsize_t number) { - spin_lock(&inode->i_lock); *inode_reserved_space(inode) += number; __inode_sub_bytes(inode, number); +} + +void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) +{ + spin_lock(&inode->i_lock); + __inode_reclaim_rsv_space(inode, number); spin_unlock(&inode->i_lock); } EXPORT_SYMBOL(inode_reclaim_rsv_space); +static inline void __inode_sub_rsv_space(struct inode *inode, qsize_t number) +{ + *inode_reserved_space(inode) -= number; +} + void inode_sub_rsv_space(struct inode *inode, qsize_t number) { spin_lock(&inode->i_lock); - *inode_reserved_space(inode) -= number; + __inode_sub_rsv_space(inode, number); spin_unlock(&inode->i_lock); } EXPORT_SYMBOL(inode_sub_rsv_space); @@ -1559,9 +1573,8 @@ static qsize_t inode_get_rsv_space(struct inode *inode) if (!inode->i_sb->dq_op->get_reserved_space) return 0; - spin_lock(&inode->i_lock); + ret = *inode_reserved_space(inode); - spin_unlock(&inode->i_lock); return ret; } @@ -1569,17 +1582,17 @@ static void inode_incr_space(struct inode *inode, qsize_t number, int reserve) { if (reserve) - inode_add_rsv_space(inode, number); + __inode_add_rsv_space(inode, number); else - inode_add_bytes(inode, number); + __inode_add_bytes(inode, number); } static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) { if (reserve) - inode_sub_rsv_space(inode, number); + __inode_sub_rsv_space(inode, number); else - inode_sub_bytes(inode, number); + __inode_sub_bytes(inode, number); } /* @@ -1602,10 +1615,6 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) struct dquot **dquots = inode->i_dquot; int reserve = flags & DQUOT_SPACE_RESERVE; - /* - * First test before acquiring mutex - solves deadlocks when we - * re-enter the quota code and are already holding the mutex - */ if (!dquot_active(inode)) { inode_incr_space(inode, number, reserve); goto out; @@ -1614,7 +1623,7 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) for (cnt = 0; cnt < MAXQUOTAS; cnt++) warn[cnt].w_type = QUOTA_NL_NOWARN; - down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&inode->i_lock); spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!dquots[cnt]) @@ -1623,6 +1632,7 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) !(flags & DQUOT_SPACE_WARN), &warn[cnt]); if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { spin_unlock(&dq_data_lock); + spin_unlock(&inode->i_lock); goto out_flush_warn; } } @@ -1636,12 +1646,12 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) } inode_incr_space(inode, number, reserve); spin_unlock(&dq_data_lock); + spin_unlock(&inode->i_lock); if (reserve) goto out_flush_warn; mark_all_dquot_dirty(dquots); out_flush_warn: - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); flush_warnings(warn); out: return ret; @@ -1657,13 +1667,12 @@ int dquot_alloc_inode(const struct inode *inode) struct dquot_warn warn[MAXQUOTAS]; struct dquot * const *dquots = inode->i_dquot; - /* First test before acquiring mutex - solves deadlocks when we - * re-enter the quota code and are already holding the mutex */ if (!dquot_active(inode)) return 0; for (cnt = 0; cnt < MAXQUOTAS; cnt++) warn[cnt].w_type = QUOTA_NL_NOWARN; - down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + + spin_lock((spinlock_t *)&inode->i_lock); spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!dquots[cnt]) @@ -1681,9 +1690,9 @@ int dquot_alloc_inode(const struct inode *inode) warn_put_all: spin_unlock(&dq_data_lock); + spin_unlock((spinlock_t *)&inode->i_lock); if (ret == 0) mark_all_dquot_dirty(dquots); - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); flush_warnings(warn); return ret; } @@ -1701,7 +1710,7 @@ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) return 0; } - down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&inode->i_lock); spin_lock(&dq_data_lock); /* Claim reserved quotas to allocated quotas */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { @@ -1710,10 +1719,10 @@ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) number); } /* Update inode bytes */ - inode_claim_rsv_space(inode, number); + __inode_claim_rsv_space(inode, number); spin_unlock(&dq_data_lock); + spin_unlock(&inode->i_lock); mark_all_dquot_dirty(inode->i_dquot); - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); return 0; } EXPORT_SYMBOL(dquot_claim_space_nodirty); @@ -1730,7 +1739,7 @@ void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) return; } - down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&inode->i_lock); spin_lock(&dq_data_lock); /* Claim reserved quotas to allocated quotas */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { @@ -1739,10 +1748,10 @@ void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) number); } /* Update inode bytes */ - inode_reclaim_rsv_space(inode, number); + __inode_reclaim_rsv_space(inode, number); spin_unlock(&dq_data_lock); + spin_unlock(&inode->i_lock); mark_all_dquot_dirty(inode->i_dquot); - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); return; } EXPORT_SYMBOL(dquot_reclaim_space_nodirty); @@ -1757,14 +1766,12 @@ void __dquot_free_space(struct inode *inode, qsize_t number, int flags) struct dquot **dquots = inode->i_dquot; int reserve = flags & DQUOT_SPACE_RESERVE; - /* First test before acquiring mutex - solves deadlocks when we - * re-enter the quota code and are already holding the mutex */ if (!dquot_active(inode)) { inode_decr_space(inode, number, reserve); return; } - down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&inode->i_lock); spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { int wtype; @@ -1782,12 +1789,12 @@ void __dquot_free_space(struct inode *inode, qsize_t number, int flags) } inode_decr_space(inode, number, reserve); spin_unlock(&dq_data_lock); + spin_unlock(&inode->i_lock); if (reserve) - goto out_unlock; + goto out; mark_all_dquot_dirty(dquots); -out_unlock: - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); +out: flush_warnings(warn); } EXPORT_SYMBOL(__dquot_free_space); @@ -1801,12 +1808,10 @@ void dquot_free_inode(const struct inode *inode) struct dquot_warn warn[MAXQUOTAS]; struct dquot * const *dquots = inode->i_dquot; - /* First test before acquiring mutex - solves deadlocks when we - * re-enter the quota code and are already holding the mutex */ if (!dquot_active(inode)) return; - down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock((spinlock_t *)&inode->i_lock); spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { int wtype; @@ -1820,8 +1825,8 @@ void dquot_free_inode(const struct inode *inode) dquot_decr_inodes(dquots[cnt], 1); } spin_unlock(&dq_data_lock); + spin_unlock((spinlock_t *)&inode->i_lock); mark_all_dquot_dirty(dquots); - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); flush_warnings(warn); } EXPORT_SYMBOL(dquot_free_inode); @@ -1847,8 +1852,6 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) struct dquot_warn warn_from_inodes[MAXQUOTAS]; struct dquot_warn warn_from_space[MAXQUOTAS]; - /* First test before acquiring mutex - solves deadlocks when we - * re-enter the quota code and are already holding the mutex */ if (IS_NOQUOTA(inode)) return 0; /* Initialize the arrays */ @@ -1857,9 +1860,9 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; } - down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&inode->i_lock); if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ - up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_unlock(&inode->i_lock); return 0; } spin_lock(&dq_data_lock); @@ -1916,7 +1919,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) inode->i_dquot[cnt] = transfer_to[cnt]; } spin_unlock(&dq_data_lock); - up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_unlock(&inode->i_lock); mark_all_dquot_dirty(transfer_from); mark_all_dquot_dirty(transfer_to); @@ -1930,7 +1933,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) return 0; over_quota: spin_unlock(&dq_data_lock); - up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_unlock(&inode->i_lock); flush_warnings(warn_to); return ret; } diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 2b363e2..e4851cb 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -79,13 +79,13 @@ static int quota_getfmt(struct super_block *sb, int type, void __user *addr) { __u32 fmt; - down_read(&sb_dqopt(sb)->dqptr_sem); + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); if (!sb_has_quota_active(sb, type)) { - up_read(&sb_dqopt(sb)->dqptr_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return -ESRCH; } fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; - up_read(&sb_dqopt(sb)->dqptr_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); if (copy_to_user(addr, &fmt, sizeof(fmt))) return -EFAULT; return 0; diff --git a/fs/stat.c b/fs/stat.c index ae0c3ce..b0e6898 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -488,12 +488,17 @@ void inode_sub_bytes(struct inode *inode, loff_t bytes) EXPORT_SYMBOL(inode_sub_bytes); +loff_t __inode_get_bytes(struct inode *inode) +{ + return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; +} + loff_t inode_get_bytes(struct inode *inode) { loff_t ret; spin_lock(&inode->i_lock); - ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; + ret = __inode_get_bytes(inode); spin_unlock(&inode->i_lock); return ret; } diff --git a/fs/super.c b/fs/super.c index 48377f7..a97aecf 100644 --- a/fs/super.c +++ b/fs/super.c @@ -214,7 +214,6 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags) lockdep_set_class(&s->s_vfs_rename_mutex, &type->s_vfs_rename_key); mutex_init(&s->s_dquot.dqio_mutex); mutex_init(&s->s_dquot.dqonoff_mutex); - init_rwsem(&s->s_dquot.dqptr_sem); s->s_maxbytes = MAX_NON_LFS; s->s_op = &default_op; s->s_time_gran = 1000000000; diff --git a/include/linux/fs.h b/include/linux/fs.h index 8780312..cd2f427 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2518,6 +2518,7 @@ void __inode_add_bytes(struct inode *inode, loff_t bytes); void inode_add_bytes(struct inode *inode, loff_t bytes); void __inode_sub_bytes(struct inode *inode, loff_t bytes); void inode_sub_bytes(struct inode *inode, loff_t bytes); +loff_t __inode_get_bytes(struct inode *inode); loff_t inode_get_bytes(struct inode *inode); void inode_set_bytes(struct inode *inode, loff_t bytes); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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