diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-05 13:20:53 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-05 13:20:53 -0800 |
commit | e213e26ab3988c516c06eba4dcd030ac052f6dc9 (patch) | |
tree | 6e26fbdbb842b387697d73daf6e70cf718269a77 /fs/quota/dquot.c | |
parent | c812a51d11bbe983f4c24e32b59b265705ddd3c2 (diff) | |
parent | efd8f0e6f6c1faa041f228d7113bd3a9db802d49 (diff) | |
download | linux-e213e26ab3988c516c06eba4dcd030ac052f6dc9.tar.gz linux-e213e26ab3988c516c06eba4dcd030ac052f6dc9.tar.bz2 linux-e213e26ab3988c516c06eba4dcd030ac052f6dc9.zip |
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: (33 commits)
quota: stop using QUOTA_OK / NO_QUOTA
dquot: cleanup dquot initialize routine
dquot: move dquot initialization responsibility into the filesystem
dquot: cleanup dquot drop routine
dquot: move dquot drop responsibility into the filesystem
dquot: cleanup dquot transfer routine
dquot: move dquot transfer responsibility into the filesystem
dquot: cleanup inode allocation / freeing routines
dquot: cleanup space allocation / freeing routines
ext3: add writepage sanity checks
ext3: Truncate allocated blocks if direct IO write fails to update i_size
quota: Properly invalidate caches even for filesystems with blocksize < pagesize
quota: generalize quota transfer interface
quota: sb_quota state flags cleanup
jbd: Delay discarding buffers in journal_unmap_buffer
ext3: quota_write cross block boundary behaviour
quota: drop permission checks from xfs_fs_set_xstate/xfs_fs_set_xquota
quota: split out compat_sys_quotactl support from quota.c
quota: split out netlink notification support from quota.c
quota: remove invalid optimization from quota_sync_all
...
Fixed trivial conflicts in fs/namei.c and fs/ufs/inode.c
Diffstat (limited to 'fs/quota/dquot.c')
-rw-r--r-- | fs/quota/dquot.c | 412 |
1 files changed, 221 insertions, 191 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 3fc62b097bed..e0b870f4749f 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -100,9 +100,13 @@ * * 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 - * (these locking rules also apply for S_NOQUOTA flag in the inode - note that - * for altering the flag i_mutex is also needed). + * read lock is enough. If pointers are altered function must hold write 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 + * sure they cannot race with quotaon which first sets S_NOQUOTA flag and + * then drops all pointers to dquots from an inode. * * Each dquot has its dq_lock mutex. Locked dquots might not be referenced * from inodes (dquot_alloc_space() and such don't check the dq_lock). @@ -225,6 +229,9 @@ static struct hlist_head *dquot_hash; struct dqstats dqstats; EXPORT_SYMBOL(dqstats); +static qsize_t inode_get_rsv_space(struct inode *inode); +static void __dquot_initialize(struct inode *inode, int type); + static inline unsigned int hashfn(const struct super_block *sb, unsigned int id, int type) { @@ -564,7 +571,7 @@ out: } EXPORT_SYMBOL(dquot_scan_active); -int vfs_quota_sync(struct super_block *sb, int type) +int vfs_quota_sync(struct super_block *sb, int type, int wait) { struct list_head *dirty; struct dquot *dquot; @@ -609,6 +616,33 @@ int vfs_quota_sync(struct super_block *sb, int type) spin_unlock(&dq_list_lock); mutex_unlock(&dqopt->dqonoff_mutex); + if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) + return 0; + + /* This is not very clever (and fast) but currently I don't know about + * any other simple way of getting quota data to disk and we must get + * them there for userspace to be visible... */ + if (sb->s_op->sync_fs) + sb->s_op->sync_fs(sb, 1); + sync_blockdev(sb->s_bdev); + + /* + * Now when everything is written we can discard the pagecache so + * that userspace sees the changes. + */ + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + if (type != -1 && cnt != type) + continue; + if (!sb_has_quota_active(sb, cnt)) + continue; + mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, + I_MUTEX_QUOTA); + truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); + mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); + } + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); + return 0; } EXPORT_SYMBOL(vfs_quota_sync); @@ -840,11 +874,14 @@ static int dqinit_needed(struct inode *inode, int type) static void add_dquot_ref(struct super_block *sb, int type) { struct inode *inode, *old_inode = NULL; + int reserved = 0; spin_lock(&inode_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) continue; + if (unlikely(inode_get_rsv_space(inode) > 0)) + reserved = 1; if (!atomic_read(&inode->i_writecount)) continue; if (!dqinit_needed(inode, type)) @@ -854,7 +891,7 @@ static void add_dquot_ref(struct super_block *sb, int type) spin_unlock(&inode_lock); iput(old_inode); - sb->dq_op->initialize(inode, type); + __dquot_initialize(inode, type); /* We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the inode_lock. * We cannot iput the inode now as we can be holding the last @@ -865,6 +902,12 @@ static void add_dquot_ref(struct super_block *sb, int type) } spin_unlock(&inode_lock); iput(old_inode); + + if (reserved) { + printk(KERN_WARNING "VFS (%s): Writes happened before quota" + " was turned on thus quota information is probably " + "inconsistent. Please run quotacheck(8).\n", sb->s_id); + } } /* @@ -978,10 +1021,12 @@ static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) /* * Claim reserved quota space */ -static void dquot_claim_reserved_space(struct dquot *dquot, - qsize_t number) +static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) { - WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); + if (dquot->dq_dqb.dqb_rsvspace < number) { + WARN_ON_ONCE(1); + number = dquot->dq_dqb.dqb_rsvspace; + } dquot->dq_dqb.dqb_curspace += number; dquot->dq_dqb.dqb_rsvspace -= number; } @@ -989,7 +1034,12 @@ static void dquot_claim_reserved_space(struct dquot *dquot, static inline void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) { - dquot->dq_dqb.dqb_rsvspace -= number; + if (dquot->dq_dqb.dqb_rsvspace >= number) + dquot->dq_dqb.dqb_rsvspace -= number; + else { + WARN_ON_ONCE(1); + dquot->dq_dqb.dqb_rsvspace = 0; + } } static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) @@ -1131,13 +1181,13 @@ static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) *warntype = QUOTA_NL_NOWARN; if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || test_bit(DQ_FAKE_B, &dquot->dq_flags)) - return QUOTA_OK; + return 0; if (dquot->dq_dqb.dqb_ihardlimit && newinodes > dquot->dq_dqb.dqb_ihardlimit && !ignore_hardlimit(dquot)) { *warntype = QUOTA_NL_IHARDWARN; - return NO_QUOTA; + return -EDQUOT; } if (dquot->dq_dqb.dqb_isoftlimit && @@ -1146,7 +1196,7 @@ static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) get_seconds() >= dquot->dq_dqb.dqb_itime && !ignore_hardlimit(dquot)) { *warntype = QUOTA_NL_ISOFTLONGWARN; - return NO_QUOTA; + return -EDQUOT; } if (dquot->dq_dqb.dqb_isoftlimit && @@ -1157,7 +1207,7 @@ static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; } - return QUOTA_OK; + return 0; } /* needs dq_data_lock */ @@ -1169,7 +1219,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war *warntype = QUOTA_NL_NOWARN; if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || test_bit(DQ_FAKE_B, &dquot->dq_flags)) - return QUOTA_OK; + return 0; tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace + space; @@ -1179,7 +1229,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war !ignore_hardlimit(dquot)) { if (!prealloc) *warntype = QUOTA_NL_BHARDWARN; - return NO_QUOTA; + return -EDQUOT; } if (dquot->dq_dqb.dqb_bsoftlimit && @@ -1189,7 +1239,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war !ignore_hardlimit(dquot)) { if (!prealloc) *warntype = QUOTA_NL_BSOFTLONGWARN; - return NO_QUOTA; + return -EDQUOT; } if (dquot->dq_dqb.dqb_bsoftlimit && @@ -1205,10 +1255,10 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war * We don't allow preallocation to exceed softlimit so exceeding will * be always printed */ - return NO_QUOTA; + return -EDQUOT; } - return QUOTA_OK; + return 0; } static int info_idq_free(struct dquot *dquot, qsize_t inodes) @@ -1242,25 +1292,32 @@ static int info_bdq_free(struct dquot *dquot, qsize_t space) return QUOTA_NL_BHARDBELOW; return QUOTA_NL_NOWARN; } + /* - * 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. + * 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. */ -int dquot_initialize(struct inode *inode, int type) +static void __dquot_initialize(struct inode *inode, int type) { unsigned int id = 0; - int cnt, ret = 0; - struct dquot *got[MAXQUOTAS] = { NULL, NULL }; + int cnt; + struct dquot *got[MAXQUOTAS]; 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 (IS_NOQUOTA(inode)) - return 0; + if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) + return; /* First get references to structures we might need. */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + got[cnt] = NULL; if (type != -1 && cnt != type) continue; switch (cnt) { @@ -1275,7 +1332,6 @@ int dquot_initialize(struct inode *inode, int type) } down_write(&sb_dqopt(sb)->dqptr_sem); - /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ if (IS_NOQUOTA(inode)) goto out_err; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { @@ -1287,20 +1343,31 @@ int dquot_initialize(struct inode *inode, int type) if (!inode->i_dquot[cnt]) { inode->i_dquot[cnt] = got[cnt]; got[cnt] = NULL; + /* + * Make quota reservation system happy if someone + * did a write before quota was turned on + */ + rsv = inode_get_rsv_space(inode); + if (unlikely(rsv)) + dquot_resv_space(inode->i_dquot[cnt], rsv); } } out_err: up_write(&sb_dqopt(sb)->dqptr_sem); /* Drop unused references */ dqput_all(got); - return ret; +} + +void dquot_initialize(struct inode *inode) +{ + __dquot_initialize(inode, -1); } EXPORT_SYMBOL(dquot_initialize); /* * Release all quotas referenced by inode */ -int dquot_drop(struct inode *inode) +static void __dquot_drop(struct inode *inode) { int cnt; struct dquot *put[MAXQUOTAS]; @@ -1312,32 +1379,31 @@ int dquot_drop(struct inode *inode) } up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); dqput_all(put); - return 0; } -EXPORT_SYMBOL(dquot_drop); -/* Wrapper to remove references to quota structures from inode */ -void vfs_dq_drop(struct inode *inode) -{ - /* Here we can get arbitrary inode from clear_inode() so we have - * to be careful. OTOH we don't need locking as quota operations - * are allowed to change only at mount time */ - if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op - && inode->i_sb->dq_op->drop) { - int cnt; - /* Test before calling to rule out calls from proc and such - * where we are not allowed to block. Note that this is - * actually reliable test even without the lock - the caller - * must assure that nobody can come after the DQUOT_DROP and - * add quota pointers back anyway */ - for (cnt = 0; cnt < MAXQUOTAS; cnt++) - if (inode->i_dquot[cnt]) - break; - if (cnt < MAXQUOTAS) - inode->i_sb->dq_op->drop(inode); - } -} -EXPORT_SYMBOL(vfs_dq_drop); +void dquot_drop(struct inode *inode) +{ + int cnt; + + if (IS_NOQUOTA(inode)) + return; + + /* + * Test before calling to rule out calls from proc and such + * where we are not allowed to block. Note that this is + * actually reliable test even without the lock - the caller + * must assure that nobody can come after the DQUOT_DROP and + * add quota pointers back anyway. + */ + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + if (inode->i_dquot[cnt]) + break; + } + + if (cnt < MAXQUOTAS) + __dquot_drop(inode); +} +EXPORT_SYMBOL(dquot_drop); /* * inode_reserved_space is managed internally by quota, and protected by @@ -1351,28 +1417,30 @@ static qsize_t *inode_reserved_space(struct inode * inode) return inode->i_sb->dq_op->get_reserved_space(inode); } -static void inode_add_rsv_space(struct inode *inode, qsize_t number) +void inode_add_rsv_space(struct inode *inode, qsize_t number) { spin_lock(&inode->i_lock); *inode_reserved_space(inode) += number; spin_unlock(&inode->i_lock); } +EXPORT_SYMBOL(inode_add_rsv_space); - -static void inode_claim_rsv_space(struct inode *inode, qsize_t 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); spin_unlock(&inode->i_lock); } +EXPORT_SYMBOL(inode_claim_rsv_space); -static void inode_sub_rsv_space(struct inode *inode, qsize_t number) +void inode_sub_rsv_space(struct inode *inode, qsize_t number) { spin_lock(&inode->i_lock); *inode_reserved_space(inode) -= number; spin_unlock(&inode->i_lock); } +EXPORT_SYMBOL(inode_sub_rsv_space); static qsize_t inode_get_rsv_space(struct inode *inode) { @@ -1404,38 +1472,34 @@ static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) } /* - * Following four functions update i_blocks+i_bytes fields and - * quota information (together with appropriate checks) - * NOTE: We absolutely rely on the fact that caller dirties - * the inode (usually macros in quotaops.h care about this) and - * holds a handle for the current transaction so that dquot write and - * inode write go into the same transaction. + * This functions updates i_blocks+i_bytes fields and quota information + * (together with appropriate checks). + * + * NOTE: We absolutely rely on the fact that caller dirties the inode + * (usually helpers in quotaops.h care about this) and holds a handle for + * the current transaction so that dquot write and inode write go into the + * same transaction. */ /* * This operation can block, but only after everything is updated */ int __dquot_alloc_space(struct inode *inode, qsize_t number, - int warn, int reserve) + int warn, int reserve) { - int cnt, ret = QUOTA_OK; + int cnt, ret = 0; char warntype[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)) { + if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { inode_incr_space(inode, number, reserve); goto out; } down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - if (IS_NOQUOTA(inode)) { - inode_incr_space(inode, number, reserve); - goto out_unlock; - } - for (cnt = 0; cnt < MAXQUOTAS; cnt++) warntype[cnt] = QUOTA_NL_NOWARN; @@ -1443,9 +1507,9 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!inode->i_dquot[cnt]) continue; - if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) - == NO_QUOTA) { - ret = NO_QUOTA; + ret = check_bdq(inode->i_dquot[cnt], number, !warn, + warntype+cnt); + if (ret) { spin_unlock(&dq_data_lock); goto out_flush_warn; } @@ -1466,61 +1530,45 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, mark_all_dquot_dirty(inode->i_dquot); out_flush_warn: flush_warnings(inode->i_dquot, warntype); -out_unlock: up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); out: return ret; } - -int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) -{ - return __dquot_alloc_space(inode, number, warn, 0); -} -EXPORT_SYMBOL(dquot_alloc_space); - -int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) -{ - return __dquot_alloc_space(inode, number, warn, 1); -} -EXPORT_SYMBOL(dquot_reserve_space); +EXPORT_SYMBOL(__dquot_alloc_space); /* * This operation can block, but only after everything is updated */ -int dquot_alloc_inode(const struct inode *inode, qsize_t number) +int dquot_alloc_inode(const struct inode *inode) { - int cnt, ret = NO_QUOTA; + int cnt, ret = 0; char warntype[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 QUOTA_OK; + if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) + return 0; for (cnt = 0; cnt < MAXQUOTAS; cnt++) warntype[cnt] = QUOTA_NL_NOWARN; down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - if (IS_NOQUOTA(inode)) { - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - return QUOTA_OK; - } spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!inode->i_dquot[cnt]) continue; - if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) - == NO_QUOTA) + ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); + if (ret) goto warn_put_all; } for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!inode->i_dquot[cnt]) continue; - dquot_incr_inodes(inode->i_dquot[cnt], number); + dquot_incr_inodes(inode->i_dquot[cnt], 1); } - ret = QUOTA_OK; + warn_put_all: spin_unlock(&dq_data_lock); - if (ret == QUOTA_OK) + if (ret == 0) mark_all_dquot_dirty(inode->i_dquot); flush_warnings(inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); @@ -1528,23 +1576,19 @@ warn_put_all: } EXPORT_SYMBOL(dquot_alloc_inode); -int dquot_claim_space(struct inode *inode, qsize_t number) +/* + * Convert in-memory reserved quotas to real consumed quotas + */ +int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) { int cnt; - int ret = QUOTA_OK; - if (IS_NOQUOTA(inode)) { + if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { inode_claim_rsv_space(inode, number); - goto out; + return 0; } down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - if (IS_NOQUOTA(inode)) { - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - inode_claim_rsv_space(inode, number); - goto out; - } - spin_lock(&dq_data_lock); /* Claim reserved quotas to allocated quotas */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { @@ -1557,33 +1601,26 @@ int dquot_claim_space(struct inode *inode, qsize_t number) spin_unlock(&dq_data_lock); mark_all_dquot_dirty(inode->i_dquot); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); -out: - return ret; + return 0; } -EXPORT_SYMBOL(dquot_claim_space); +EXPORT_SYMBOL(dquot_claim_space_nodirty); /* * This operation can block, but only after everything is updated */ -int __dquot_free_space(struct inode *inode, qsize_t number, int reserve) +void __dquot_free_space(struct inode *inode, qsize_t number, int reserve) { unsigned int cnt; char warntype[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)) { -out_sub: + if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { inode_decr_space(inode, number, reserve); - return QUOTA_OK; + return; } down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - /* Now recheck reliably when holding dqptr_sem */ - if (IS_NOQUOTA(inode)) { - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - goto out_sub; - } spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!inode->i_dquot[cnt]) @@ -1603,56 +1640,34 @@ out_sub: out_unlock: flush_warnings(inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - return QUOTA_OK; -} - -int dquot_free_space(struct inode *inode, qsize_t number) -{ - return __dquot_free_space(inode, number, 0); } -EXPORT_SYMBOL(dquot_free_space); - -/* - * Release reserved quota space - */ -void dquot_release_reserved_space(struct inode *inode, qsize_t number) -{ - __dquot_free_space(inode, number, 1); - -} -EXPORT_SYMBOL(dquot_release_reserved_space); +EXPORT_SYMBOL(__dquot_free_space); /* * This operation can block, but only after everything is updated */ -int dquot_free_inode(const struct inode *inode, qsize_t number) +void dquot_free_inode(const struct inode *inode) { unsigned int cnt; char warntype[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 QUOTA_OK; + if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) + return; down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - /* Now recheck reliably when holding dqptr_sem */ - if (IS_NOQUOTA(inode)) { - up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - return QUOTA_OK; - } spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!inode->i_dquot[cnt]) continue; - warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); - dquot_decr_inodes(inode->i_dquot[cnt], number); + warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); + dquot_decr_inodes(inode->i_dquot[cnt], 1); } spin_unlock(&dq_data_lock); mark_all_dquot_dirty(inode->i_dquot); flush_warnings(inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); - return QUOTA_OK; } EXPORT_SYMBOL(dquot_free_inode); @@ -1662,37 +1677,31 @@ EXPORT_SYMBOL(dquot_free_inode); * This operation can block, but only after everything is updated * A transaction must be started when entering this function. */ -int dquot_transfer(struct inode *inode, struct iattr *iattr) +static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask) { qsize_t space, cur_space; qsize_t rsv_space = 0; struct dquot *transfer_from[MAXQUOTAS]; struct dquot *transfer_to[MAXQUOTAS]; - int cnt, ret = QUOTA_OK; - int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, - chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; + int cnt, ret = 0; char warntype_to[MAXQUOTAS]; char warntype_from_inodes[MAXQUOTAS], warntype_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 QUOTA_OK; + return 0; /* Initialize the arrays */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { transfer_from[cnt] = NULL; transfer_to[cnt] = NULL; warntype_to[cnt] = QUOTA_NL_NOWARN; } - if (chuid) - transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid, - USRQUOTA); - if (chgid) - transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid, - GRPQUOTA); - + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + if (mask & (1 << cnt)) + transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt); + } down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); - /* Now recheck reliably when holding dqptr_sem */ if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); goto put_all; @@ -1706,9 +1715,11 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr) if (!transfer_to[cnt]) continue; transfer_from[cnt] = inode->i_dquot[cnt]; - if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == - NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, - warntype_to + cnt) == NO_QUOTA) + ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); + if (ret) + goto over_quota; + ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); + if (ret) goto over_quota; } @@ -1762,22 +1773,32 @@ over_quota: /* Clear dquot pointers we don't want to dqput() */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) transfer_from[cnt] = NULL; - ret = NO_QUOTA; goto warn_put_all; } -EXPORT_SYMBOL(dquot_transfer); -/* Wrapper for transferring ownership of an inode */ -int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) +/* Wrapper for transferring ownership of an inode for uid/gid only + * Called from FSXXX_setattr() + */ +int dquot_transfer(struct inode *inode, struct iattr *iattr) { + qid_t chid[MAXQUOTAS]; + unsigned long mask = 0; + + if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) { + mask |= 1 << USRQUOTA; + chid[USRQUOTA] = iattr->ia_uid; + } + if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) { + mask |= 1 << GRPQUOTA; + chid[GRPQUOTA] = iattr->ia_gid; + } if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { - vfs_dq_init(inode); - if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) - return 1; + dquot_initialize(inode); + return __dquot_transfer(inode, chid, mask); } return 0; } -EXPORT_SYMBOL(vfs_dq_transfer); +EXPORT_SYMBOL(dquot_transfer); /* * Write info of quota file to disk @@ -1798,13 +1819,6 @@ EXPORT_SYMBOL(dquot_commit_info); * Definitions of diskquota operations. */ const struct dquot_operations dquot_operations = { - .initialize = dquot_initialize, - .drop = dquot_drop, - .alloc_space = dquot_alloc_space, - .alloc_inode = dquot_alloc_inode, - .free_space = dquot_free_space, - .free_inode = dquot_free_inode, - .transfer = dquot_transfer, .write_dquot = dquot_commit, .acquire_dquot = dquot_acquire, .release_dquot = dquot_release, @@ -1815,6 +1829,20 @@ const struct dquot_operations dquot_operations = { }; /* + * Generic helper for ->open on filesystems supporting disk quotas. + */ +int dquot_file_open(struct inode *inode, struct file *file) +{ + int error; + + error = generic_file_open(inode, file); + if (!error && (file->f_mode & FMODE_WRITE)) + dquot_initialize(inode); + return error; +} +EXPORT_SYMBOL(dquot_file_open); + +/* * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) */ int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) @@ -1993,11 +2021,13 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, } if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { - /* As we bypass the pagecache we must now flush the inode so - * that we see all the changes from userspace... */ - write_inode_now(inode, 1); - /* And now flush the block cache so that kernel sees the - * changes */ + /* As we bypass the pagecache we must now flush all the + * dirty data and invalidate caches so that kernel sees + * changes from userspace. It is not enough to just flush + * the quota file since if blocksize < pagesize, invalidation + * of the cache could fail because of other unrelated dirty + * data */ + sync_filesystem(sb); invalidate_bdev(sb->s_bdev); } mutex_lock(&dqopt->dqonoff_mutex); @@ -2010,14 +2040,16 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, /* We don't want quota and atime on quota files (deadlocks * possible) Also nobody should write to the file - we use * special IO operations which ignore the immutable bit. */ - down_write(&dqopt->dqptr_sem); mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA); inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; mutex_unlock(&inode->i_mutex); - up_write(&dqopt->dqptr_sem); - sb->dq_op->drop(inode); + /* + * When S_NOQUOTA is set, remove dquot references as no more + * references can be added + */ + __dquot_drop(inode); } error = -EIO; @@ -2053,14 +2085,12 @@ out_file_init: iput(inode); out_lock: if (oldflags != -1) { - down_write(&dqopt->dqptr_sem); mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); /* Set the flags back (in the case of accidental quotaon() * on a wrong file we don't want to mess up the flags) */ inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); inode->i_flags |= oldflags; mutex_unlock(&inode->i_mutex); - up_write(&dqopt->dqptr_sem); } mutex_unlock(&dqopt->dqonoff_mutex); out_fmt: |