X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fdquot.c;h=8ec4d6cc763317bf8403a7eae3c666ef2b97b136;hb=6ee6c6adf1cfebbf432b8d1f204c7f96e395933e;hp=2a62b3dc20ec00a76c665a8f1e9dda9808e715b6;hpb=154f484b92e5c25c400f6903512c511644a49322;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/dquot.c b/fs/dquot.c index 2a62b3d..8ec4d6c 100644 --- a/fs/dquot.c +++ b/fs/dquot.c @@ -69,7 +69,6 @@ #include #include #include -#include #include #include #include @@ -77,7 +76,13 @@ #include #include #include +#include #include +#include /* for inode_lock, oddly enough.. */ +#ifdef CONFIG_QUOTA_NETLINK_INTERFACE +#include +#include +#endif #include @@ -100,14 +105,14 @@ * 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_sem is also needed). If operation is holding + * for altering the flag i_mutex is also needed). If operation is holding * reference to dquot in other way (e.g. quotactl ops) it must be guarded by - * dqonoff_sem. + * dqonoff_mutex. * This locking assures that: * a) update/access to dquot pointers in inode is serialized * b) everyone is guarded against invalidate_dquots() * - * Each dquot has its dq_lock semaphore. Locked dquots might not be referenced + * 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). * Currently dquot is locked only when it is being read to memory (or space for * it is being allocated) on the first dqget() and when it is being released on @@ -117,9 +122,9 @@ * spinlock to internal buffers before writing. * * Lock ordering (including related VFS locks) is the following: - * i_sem > dqonoff_sem > iprune_sem > journal_lock > dqptr_sem > - * > dquot->dq_lock > dqio_sem - * i_sem on quota files is special (it's below dqio_sem) + * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > + * dqio_mutex + * i_mutex on quota files is special (it's below dqio_mutex) */ static DEFINE_SPINLOCK(dq_list_lock); @@ -130,7 +135,7 @@ static struct quota_format_type *quota_formats; /* List of registered formats */ static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; /* SLAB cache for dquot structures */ -static kmem_cache_t *dquot_cachep; +static struct kmem_cache *dquot_cachep; int register_quota_format(struct quota_format_type *fmt) { @@ -249,7 +254,7 @@ static inline struct dquot *find_dquot(unsigned int hashent, struct super_block /* Add a dquot to the tail of the free list */ static inline void put_dquot_last(struct dquot *dquot) { - list_add(&dquot->dq_free, free_dquots.prev); + list_add_tail(&dquot->dq_free, &free_dquots); dqstats.free_dquots++; } @@ -265,7 +270,7 @@ static inline void put_inuse(struct dquot *dquot) { /* We add to the back of inuse list so we don't have to restart * when traversing this list and we block */ - list_add(&dquot->dq_inuse, inuse_list.prev); + list_add_tail(&dquot->dq_inuse, &inuse_list); dqstats.allocated_dquots++; } @@ -280,11 +285,19 @@ static inline void remove_inuse(struct dquot *dquot) static void wait_on_dquot(struct dquot *dquot) { - down(&dquot->dq_lock); - up(&dquot->dq_lock); + mutex_lock(&dquot->dq_lock); + mutex_unlock(&dquot->dq_lock); } -#define mark_dquot_dirty(dquot) ((dquot)->dq_sb->dq_op->mark_dirty(dquot)) +static inline int dquot_dirty(struct dquot *dquot) +{ + return test_bit(DQ_MOD_B, &dquot->dq_flags); +} + +static inline int mark_dquot_dirty(struct dquot *dquot) +{ + return dquot->dq_sb->dq_op->mark_dirty(dquot); +} int dquot_mark_dquot_dirty(struct dquot *dquot) { @@ -320,8 +333,8 @@ int dquot_acquire(struct dquot *dquot) int ret = 0, ret2 = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); - down(&dquot->dq_lock); - down(&dqopt->dqio_sem); + mutex_lock(&dquot->dq_lock); + mutex_lock(&dqopt->dqio_mutex); if (!test_bit(DQ_READ_B, &dquot->dq_flags)) ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); if (ret < 0) @@ -342,8 +355,8 @@ int dquot_acquire(struct dquot *dquot) } set_bit(DQ_ACTIVE_B, &dquot->dq_flags); out_iolock: - up(&dqopt->dqio_sem); - up(&dquot->dq_lock); + mutex_unlock(&dqopt->dqio_mutex); + mutex_unlock(&dquot->dq_lock); return ret; } @@ -355,7 +368,7 @@ int dquot_commit(struct dquot *dquot) int ret = 0, ret2 = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); - down(&dqopt->dqio_sem); + mutex_lock(&dqopt->dqio_mutex); spin_lock(&dq_list_lock); if (!clear_dquot_dirty(dquot)) { spin_unlock(&dq_list_lock); @@ -372,7 +385,7 @@ int dquot_commit(struct dquot *dquot) ret = ret2; } out_sem: - up(&dqopt->dqio_sem); + mutex_unlock(&dqopt->dqio_mutex); return ret; } @@ -384,11 +397,11 @@ int dquot_release(struct dquot *dquot) int ret = 0, ret2 = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); - down(&dquot->dq_lock); + mutex_lock(&dquot->dq_lock); /* Check whether we are not racing with some other dqget() */ if (atomic_read(&dquot->dq_count) > 1) goto out_dqlock; - down(&dqopt->dqio_sem); + mutex_lock(&dqopt->dqio_mutex); if (dqopt->ops[dquot->dq_type]->release_dqblk) { ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); /* Write the info */ @@ -398,31 +411,57 @@ int dquot_release(struct dquot *dquot) ret = ret2; } clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); - up(&dqopt->dqio_sem); + mutex_unlock(&dqopt->dqio_mutex); out_dqlock: - up(&dquot->dq_lock); + mutex_unlock(&dquot->dq_lock); return ret; } /* Invalidate all dquots on the list. Note that this function is called after * quota is disabled and pointers from inodes removed so there cannot be new - * quota users. Also because we hold dqonoff_sem there can be no quota users - * for this sb+type at all. */ + * quota users. There can still be some users of quotas due to inodes being + * just deleted or pruned by prune_icache() (those are not attached to any + * list). We have to wait for such users. + */ static void invalidate_dquots(struct super_block *sb, int type) { struct dquot *dquot, *tmp; +restart: spin_lock(&dq_list_lock); list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { if (dquot->dq_sb != sb) continue; if (dquot->dq_type != type) continue; -#ifdef __DQUOT_PARANOIA - if (atomic_read(&dquot->dq_count)) - BUG(); -#endif - /* Quota now has no users and it has been written on last dqput() */ + /* Wait for dquot users */ + if (atomic_read(&dquot->dq_count)) { + DEFINE_WAIT(wait); + + atomic_inc(&dquot->dq_count); + prepare_to_wait(&dquot->dq_wait_unused, &wait, + TASK_UNINTERRUPTIBLE); + spin_unlock(&dq_list_lock); + /* Once dqput() wakes us up, we know it's time to free + * the dquot. + * IMPORTANT: we rely on the fact that there is always + * at most one process waiting for dquot to free. + * Otherwise dq_count would be > 1 and we would never + * wake up. + */ + if (atomic_read(&dquot->dq_count) > 1) + schedule(); + finish_wait(&dquot->dq_wait_unused, &wait); + dqput(dquot); + /* At this moment dquot() need not exist (it could be + * reclaimed by prune_dqcache(). Hence we must + * restart. */ + goto restart; + } + /* + * Quota now has no users and it has been written on last + * dqput() + */ remove_dquot_hash(dquot); remove_free_dquot(dquot); remove_inuse(dquot); @@ -438,7 +477,7 @@ int vfs_quota_sync(struct super_block *sb, int type) struct quota_info *dqopt = sb_dqopt(sb); int cnt; - down(&dqopt->dqonoff_sem); + mutex_lock(&dqopt->dqonoff_mutex); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (type != -1 && cnt != type) continue; @@ -447,7 +486,7 @@ int vfs_quota_sync(struct super_block *sb, int type) spin_lock(&dq_list_lock); dirty = &dqopt->info[cnt].dqi_dirty_list; while (!list_empty(dirty)) { - dquot = list_entry(dirty->next, struct dquot, dq_dirty); + dquot = list_first_entry(dirty, struct dquot, dq_dirty); /* Dirty and inactive can be only bad dquot... */ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { clear_dquot_dirty(dquot); @@ -473,7 +512,7 @@ int vfs_quota_sync(struct super_block *sb, int type) spin_lock(&dq_list_lock); dqstats.syncs++; spin_unlock(&dq_list_lock); - up(&dqopt->dqonoff_sem); + mutex_unlock(&dqopt->dqonoff_mutex); return 0; } @@ -511,13 +550,20 @@ static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; } +static struct shrinker dqcache_shrinker = { + .shrink = shrink_dqcache_memory, + .seeks = DEFAULT_SEEKS, +}; + /* * Put reference to dquot * NOTE: If you change this function please check whether dqput_blocks() works right... - * MUST be called with either dqptr_sem or dqonoff_sem held + * MUST be called with either dqptr_sem or dqonoff_mutex held */ static void dqput(struct dquot *dquot) { + int ret; + if (!dquot) return; #ifdef __DQUOT_PARANOIA @@ -539,6 +585,10 @@ we_slept: if (atomic_read(&dquot->dq_count) > 1) { /* We have more than one user... nothing to do */ atomic_dec(&dquot->dq_count); + /* Releasing dquot during quotaoff phase? */ + if (!sb_has_quota_enabled(dquot->dq_sb, dquot->dq_type) && + atomic_read(&dquot->dq_count) == 1) + wake_up(&dquot->dq_wait_unused); spin_unlock(&dq_list_lock); return; } @@ -546,7 +596,19 @@ we_slept: if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { spin_unlock(&dq_list_lock); /* Commit dquot before releasing */ - dquot->dq_sb->dq_op->write_dquot(dquot); + ret = dquot->dq_sb->dq_op->write_dquot(dquot); + if (ret < 0) { + printk(KERN_ERR "VFS: cannot write quota structure on " + "device %s (error %d). Quota may get out of " + "sync!\n", dquot->dq_sb->s_id, ret); + /* + * We clear dirty bit anyway, so that we avoid + * infinite loop here + */ + spin_lock(&dq_list_lock); + clear_dquot_dirty(dquot); + spin_unlock(&dq_list_lock); + } goto we_slept; } /* Clear flag in case dquot was inactive (something bad happened) */ @@ -559,8 +621,7 @@ we_slept: atomic_dec(&dquot->dq_count); #ifdef __DQUOT_PARANOIA /* sanity check */ - if (!list_empty(&dquot->dq_free)) - BUG(); + BUG_ON(!list_empty(&dquot->dq_free)); #endif put_dquot_last(dquot); spin_unlock(&dq_list_lock); @@ -570,16 +631,16 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type) { struct dquot *dquot; - dquot = kmem_cache_alloc(dquot_cachep, SLAB_NOFS); + dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS); if(!dquot) return NODQUOT; - memset((caddr_t)dquot, 0, sizeof(struct dquot)); - sema_init(&dquot->dq_lock, 1); + mutex_init(&dquot->dq_lock); INIT_LIST_HEAD(&dquot->dq_free); INIT_LIST_HEAD(&dquot->dq_inuse); INIT_HLIST_NODE(&dquot->dq_hash); INIT_LIST_HEAD(&dquot->dq_dirty); + init_waitqueue_head(&dquot->dq_wait_unused); dquot->dq_sb = sb; dquot->dq_type = type; atomic_set(&dquot->dq_count, 1); @@ -589,7 +650,7 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type) /* * Get reference to dquot - * MUST be called with either dqptr_sem or dqonoff_sem held + * MUST be called with either dqptr_sem or dqonoff_mutex held */ static struct dquot *dqget(struct super_block *sb, unsigned int id, int type) { @@ -634,8 +695,7 @@ we_slept: return NODQUOT; } #ifdef __DQUOT_PARANOIA - if (!dquot->dq_sb) /* Has somebody invalidated entry under us? */ - BUG(); + BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ #endif return dquot; @@ -655,26 +715,35 @@ static int dqinit_needed(struct inode *inode, int type) return 0; } -/* This routine is guarded by dqonoff_sem semaphore */ +/* This routine is guarded by dqonoff_mutex mutex */ static void add_dquot_ref(struct super_block *sb, int type) { - struct list_head *p; + struct inode *inode, *old_inode = NULL; -restart: - file_list_lock(); - list_for_each(p, &sb->s_files) { - struct file *filp = list_entry(p, struct file, f_u.fu_list); - struct inode *inode = filp->f_dentry->d_inode; - if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) { - struct dentry *dentry = dget(filp->f_dentry); - file_list_unlock(); - sb->dq_op->initialize(inode, type); - dput(dentry); - /* As we may have blocked we had better restart... */ - goto restart; - } - } - file_list_unlock(); + spin_lock(&inode_lock); + list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { + if (!atomic_read(&inode->i_writecount)) + continue; + if (!dqinit_needed(inode, type)) + continue; + if (inode->i_state & (I_FREEING|I_WILL_FREE)) + continue; + + __iget(inode); + spin_unlock(&inode_lock); + + iput(old_inode); + sb->dq_op->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 + * reference and we cannot iput it under inode_lock. So we + * keep the reference and iput it later. */ + old_inode = inode; + spin_lock(&inode_lock); + } + spin_unlock(&inode_lock); + iput(old_inode); } /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */ @@ -687,7 +756,8 @@ static inline int dqput_blocks(struct dquot *dquot) /* Remove references to dquots from inode - add dquot to list for freeing if needed */ /* We can't race with anybody because we hold dqptr_sem for writing... */ -int remove_inode_dquot_ref(struct inode *inode, int type, struct list_head *tofree_head) +static int remove_inode_dquot_ref(struct inode *inode, int type, + struct list_head *tofree_head) { struct dquot *dquot = inode->i_dquot[type]; @@ -726,19 +796,30 @@ static void put_dquot_list(struct list_head *tofree_head) } } +static void remove_dquot_ref(struct super_block *sb, int type, + struct list_head *tofree_head) +{ + struct inode *inode; + + spin_lock(&inode_lock); + list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { + if (!IS_NOQUOTA(inode)) + remove_inode_dquot_ref(inode, type, tofree_head); + } + spin_unlock(&inode_lock); +} + /* Gather all references from inodes and drop them */ static void drop_dquot_ref(struct super_block *sb, int type) { LIST_HEAD(tofree_head); - /* We need to be guarded against prune_icache to reach all the - * inodes - otherwise some can be on the local list of prune_icache */ - down(&iprune_sem); - down_write(&sb_dqopt(sb)->dqptr_sem); - remove_dquot_ref(sb, type, &tofree_head); - up_write(&sb_dqopt(sb)->dqptr_sem); - up(&iprune_sem); - put_dquot_list(&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); + } } static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number) @@ -773,6 +854,19 @@ static inline void dquot_decr_space(struct dquot *dquot, qsize_t number) clear_bit(DQ_BLKS_B, &dquot->dq_flags); } +static int warning_issued(struct dquot *dquot, const int warntype) +{ + int flag = (warntype == QUOTA_NL_BHARDWARN || + warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : + ((warntype == QUOTA_NL_IHARDWARN || + warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); + + if (!flag) + return 0; + return test_and_set_bit(flag, &dquot->dq_flags); +} + +#ifdef CONFIG_PRINT_QUOTA_WARNING static int flag_print_warnings = 1; static inline int need_print_warning(struct dquot *dquot) @@ -789,61 +883,139 @@ static inline int need_print_warning(struct dquot *dquot) return 0; } -/* Values of warnings */ -#define NOWARN 0 -#define IHARDWARN 1 -#define ISOFTLONGWARN 2 -#define ISOFTWARN 3 -#define BHARDWARN 4 -#define BSOFTLONGWARN 5 -#define BSOFTWARN 6 - /* Print warning to user which exceeded quota */ -static void print_warning(struct dquot *dquot, const char warntype) +static void print_warning(struct dquot *dquot, const int warntype) { char *msg = NULL; - int flag = (warntype == BHARDWARN || warntype == BSOFTLONGWARN) ? DQ_BLKS_B : - ((warntype == IHARDWARN || warntype == ISOFTLONGWARN) ? DQ_INODES_B : 0); + struct tty_struct *tty; - if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags))) + if (warntype == QUOTA_NL_IHARDBELOW || + warntype == QUOTA_NL_ISOFTBELOW || + warntype == QUOTA_NL_BHARDBELOW || + warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) return; - tty_write_message(current->signal->tty, dquot->dq_sb->s_id); - if (warntype == ISOFTWARN || warntype == BSOFTWARN) - tty_write_message(current->signal->tty, ": warning, "); + mutex_lock(&tty_mutex); + tty = get_current_tty(); + if (!tty) + goto out_lock; + tty_write_message(tty, dquot->dq_sb->s_id); + if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) + tty_write_message(tty, ": warning, "); else - tty_write_message(current->signal->tty, ": write failed, "); - tty_write_message(current->signal->tty, quotatypes[dquot->dq_type]); + tty_write_message(tty, ": write failed, "); + tty_write_message(tty, quotatypes[dquot->dq_type]); switch (warntype) { - case IHARDWARN: + case QUOTA_NL_IHARDWARN: msg = " file limit reached.\r\n"; break; - case ISOFTLONGWARN: + case QUOTA_NL_ISOFTLONGWARN: msg = " file quota exceeded too long.\r\n"; break; - case ISOFTWARN: + case QUOTA_NL_ISOFTWARN: msg = " file quota exceeded.\r\n"; break; - case BHARDWARN: + case QUOTA_NL_BHARDWARN: msg = " block limit reached.\r\n"; break; - case BSOFTLONGWARN: + case QUOTA_NL_BSOFTLONGWARN: msg = " block quota exceeded too long.\r\n"; break; - case BSOFTWARN: + case QUOTA_NL_BSOFTWARN: msg = " block quota exceeded.\r\n"; break; } - tty_write_message(current->signal->tty, msg); + tty_write_message(tty, msg); +out_lock: + mutex_unlock(&tty_mutex); +} +#endif + +#ifdef CONFIG_QUOTA_NETLINK_INTERFACE + +/* Netlink family structure for quota */ +static struct genl_family quota_genl_family = { + .id = GENL_ID_GENERATE, + .hdrsize = 0, + .name = "VFS_DQUOT", + .version = 1, + .maxattr = QUOTA_NL_A_MAX, +}; + +/* Send warning to userspace about user which exceeded quota */ +static void send_warning(const struct dquot *dquot, const char warntype) +{ + static atomic_t seq; + struct sk_buff *skb; + void *msg_head; + int ret; + int msg_size = 4 * nla_total_size(sizeof(u32)) + + 2 * nla_total_size(sizeof(u64)); + + /* We have to allocate using GFP_NOFS as we are called from a + * filesystem performing write and thus further recursion into + * the fs to free some data could cause deadlocks. */ + skb = genlmsg_new(msg_size, GFP_NOFS); + if (!skb) { + printk(KERN_ERR + "VFS: Not enough memory to send quota warning.\n"); + return; + } + msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), + "a_genl_family, 0, QUOTA_NL_C_WARNING); + if (!msg_head) { + printk(KERN_ERR + "VFS: Cannot store netlink header in quota warning.\n"); + goto err_out; + } + ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type); + if (ret) + goto attr_err_out; + ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id); + if (ret) + goto attr_err_out; + ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); + if (ret) + goto attr_err_out; + ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, + MAJOR(dquot->dq_sb->s_dev)); + if (ret) + goto attr_err_out; + ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, + MINOR(dquot->dq_sb->s_dev)); + if (ret) + goto attr_err_out; + ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current->user->uid); + if (ret) + goto attr_err_out; + genlmsg_end(skb, msg_head); + + ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); + if (ret < 0 && ret != -ESRCH) + printk(KERN_ERR + "VFS: Failed to send notification message: %d\n", ret); + return; +attr_err_out: + printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); +err_out: + kfree_skb(skb); } +#endif -static inline void flush_warnings(struct dquot **dquots, char *warntype) +static inline void flush_warnings(struct dquot * const *dquots, char *warntype) { int i; for (i = 0; i < MAXQUOTAS; i++) - if (dquots[i] != NODQUOT && warntype[i] != NOWARN) + if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN && + !warning_issued(dquots[i], warntype[i])) { +#ifdef CONFIG_PRINT_QUOTA_WARNING print_warning(dquots[i], warntype[i]); +#endif +#ifdef CONFIG_QUOTA_NETLINK_INTERFACE + send_warning(dquots[i], warntype[i]); +#endif + } } static inline char ignore_hardlimit(struct dquot *dquot) @@ -857,14 +1029,14 @@ static inline char ignore_hardlimit(struct dquot *dquot) /* needs dq_data_lock */ static int check_idq(struct dquot *dquot, ulong inodes, char *warntype) { - *warntype = NOWARN; + *warntype = QUOTA_NL_NOWARN; if (inodes <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags)) return QUOTA_OK; if (dquot->dq_dqb.dqb_ihardlimit && (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit && !ignore_hardlimit(dquot)) { - *warntype = IHARDWARN; + *warntype = QUOTA_NL_IHARDWARN; return NO_QUOTA; } @@ -872,14 +1044,14 @@ static int check_idq(struct dquot *dquot, ulong inodes, char *warntype) (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime && !ignore_hardlimit(dquot)) { - *warntype = ISOFTLONGWARN; + *warntype = QUOTA_NL_ISOFTLONGWARN; return NO_QUOTA; } if (dquot->dq_dqb.dqb_isoftlimit && (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit && dquot->dq_dqb.dqb_itime == 0) { - *warntype = ISOFTWARN; + *warntype = QUOTA_NL_ISOFTWARN; dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; } @@ -889,7 +1061,7 @@ static int check_idq(struct dquot *dquot, ulong inodes, char *warntype) /* needs dq_data_lock */ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) { - *warntype = 0; + *warntype = QUOTA_NL_NOWARN; if (space <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags)) return QUOTA_OK; @@ -897,7 +1069,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bhardlimit && !ignore_hardlimit(dquot)) { if (!prealloc) - *warntype = BHARDWARN; + *warntype = QUOTA_NL_BHARDWARN; return NO_QUOTA; } @@ -906,7 +1078,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime && !ignore_hardlimit(dquot)) { if (!prealloc) - *warntype = BSOFTLONGWARN; + *warntype = QUOTA_NL_BSOFTLONGWARN; return NO_QUOTA; } @@ -914,7 +1086,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit && dquot->dq_dqb.dqb_btime == 0) { if (!prealloc) { - *warntype = BSOFTWARN; + *warntype = QUOTA_NL_BSOFTWARN; dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace; } else @@ -928,6 +1100,35 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war return QUOTA_OK; } +static int info_idq_free(struct dquot *dquot, ulong inodes) +{ + if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || + dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) + return QUOTA_NL_NOWARN; + + if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit) + return QUOTA_NL_ISOFTBELOW; + if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && + dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit) + return QUOTA_NL_IHARDBELOW; + return QUOTA_NL_NOWARN; +} + +static int info_bdq_free(struct dquot *dquot, qsize_t space) +{ + if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || + toqb(dquot->dq_dqb.dqb_curspace) <= dquot->dq_dqb.dqb_bsoftlimit) + return QUOTA_NL_NOWARN; + + if (toqb(dquot->dq_dqb.dqb_curspace - space) <= + dquot->dq_dqb.dqb_bsoftlimit) + return QUOTA_NL_BSOFTBELOW; + if (toqb(dquot->dq_dqb.dqb_curspace) >= dquot->dq_dqb.dqb_bhardlimit && + toqb(dquot->dq_dqb.dqb_curspace - space) < + dquot->dq_dqb.dqb_bhardlimit) + return QUOTA_NL_BHARDBELOW; + return QUOTA_NL_NOWARN; +} /* * Initialize quota pointers in inode * Transaction must be started at entry @@ -937,8 +1138,8 @@ int dquot_initialize(struct inode *inode, int type) unsigned int id = 0; int cnt, ret = 0; - /* First test before acquiring semaphore - solves deadlocks when we - * re-enter the quota code and are already holding the semaphore */ + /* 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; down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); @@ -984,6 +1185,28 @@ int dquot_drop(struct inode *inode) return 0; } +/* 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] != NODQUOT) + break; + if (cnt < MAXQUOTAS) + inode->i_sb->dq_op->drop(inode); + } +} + /* * Following four functions update i_blocks+i_bytes fields and * quota information (together with appropriate checks) @@ -1001,15 +1224,15 @@ int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) int cnt, ret = NO_QUOTA; char warntype[MAXQUOTAS]; - /* First test before acquiring semaphore - solves deadlocks when we - * re-enter the quota code and are already holding the semaphore */ + /* 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_add: inode_add_bytes(inode, number); return QUOTA_OK; } for (cnt = 0; cnt < MAXQUOTAS; cnt++) - warntype[cnt] = NOWARN; + warntype[cnt] = QUOTA_NL_NOWARN; down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */ @@ -1050,12 +1273,12 @@ int dquot_alloc_inode(const struct inode *inode, unsigned long number) int cnt, ret = NO_QUOTA; char warntype[MAXQUOTAS]; - /* First test before acquiring semaphore - solves deadlocks when we - * re-enter the quota code and are already holding the semaphore */ + /* 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; for (cnt = 0; cnt < MAXQUOTAS; cnt++) - warntype[cnt] = NOWARN; + 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); @@ -1082,7 +1305,7 @@ warn_put_all: for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (inode->i_dquot[cnt]) mark_dquot_dirty(inode->i_dquot[cnt]); - flush_warnings((struct dquot **)inode->i_dquot, warntype); + flush_warnings(inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); return ret; } @@ -1093,14 +1316,16 @@ warn_put_all: int dquot_free_space(struct inode *inode, qsize_t number) { unsigned int cnt; + char warntype[MAXQUOTAS]; - /* First test before acquiring semaphore - solves deadlocks when we - * re-enter the quota code and are already holding the semaphore */ + /* 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: inode_sub_bytes(inode, number); return QUOTA_OK; } + down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); /* Now recheck reliably when holding dqptr_sem */ if (IS_NOQUOTA(inode)) { @@ -1111,6 +1336,7 @@ out_sub: for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (inode->i_dquot[cnt] == NODQUOT) continue; + warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); dquot_decr_space(inode->i_dquot[cnt], number); } inode_sub_bytes(inode, number); @@ -1119,6 +1345,7 @@ out_sub: for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (inode->i_dquot[cnt]) mark_dquot_dirty(inode->i_dquot[cnt]); + flush_warnings(inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); return QUOTA_OK; } @@ -1129,11 +1356,13 @@ out_sub: int dquot_free_inode(const struct inode *inode, unsigned long number) { unsigned int cnt; + char warntype[MAXQUOTAS]; - /* First test before acquiring semaphore - solves deadlocks when we - * re-enter the quota code and are already holding the semaphore */ + /* 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; + down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); /* Now recheck reliably when holding dqptr_sem */ if (IS_NOQUOTA(inode)) { @@ -1144,6 +1373,7 @@ int dquot_free_inode(const struct inode *inode, unsigned long number) for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (inode->i_dquot[cnt] == NODQUOT) continue; + warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); dquot_decr_inodes(inode->i_dquot[cnt], number); } spin_unlock(&dq_data_lock); @@ -1151,6 +1381,7 @@ int dquot_free_inode(const struct inode *inode, unsigned long number) for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (inode->i_dquot[cnt]) mark_dquot_dirty(inode->i_dquot[cnt]); + flush_warnings(inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); return QUOTA_OK; } @@ -1168,16 +1399,17 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr) struct dquot *transfer_to[MAXQUOTAS]; int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid, chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid; - char warntype[MAXQUOTAS]; + char warntype_to[MAXQUOTAS]; + char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; - /* First test before acquiring semaphore - solves deadlocks when we - * re-enter the quota code and are already holding the semaphore */ + /* 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; /* Clear the arrays */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { transfer_to[cnt] = transfer_from[cnt] = NODQUOT; - warntype[cnt] = NOWARN; + warntype_to[cnt] = QUOTA_NL_NOWARN; } down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); /* Now recheck reliably when holding dqptr_sem */ @@ -1209,8 +1441,9 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr) if (transfer_to[cnt] == NODQUOT) continue; transfer_from[cnt] = inode->i_dquot[cnt]; - if (check_idq(transfer_to[cnt], 1, warntype+cnt) == NO_QUOTA || - check_bdq(transfer_to[cnt], space, 0, warntype+cnt) == NO_QUOTA) + if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == + NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, + warntype_to + cnt) == NO_QUOTA) goto warn_put_all; } @@ -1226,6 +1459,10 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr) /* Due to IO error we might not have transfer_from[] structure */ if (transfer_from[cnt]) { + warntype_from_inodes[cnt] = + info_idq_free(transfer_from[cnt], 1); + warntype_from_space[cnt] = + info_bdq_free(transfer_from[cnt], space); dquot_decr_inodes(transfer_from[cnt], 1); dquot_decr_space(transfer_from[cnt], space); } @@ -1245,7 +1482,9 @@ warn_put_all: if (transfer_to[cnt]) mark_dquot_dirty(transfer_to[cnt]); } - flush_warnings(transfer_to, warntype); + flush_warnings(transfer_to, warntype_to); + flush_warnings(transfer_from, warntype_from_inodes); + flush_warnings(transfer_from, warntype_from_space); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT) @@ -1257,6 +1496,18 @@ warn_put_all: return ret; } +/* Wrapper for transferring ownership of an inode */ +int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) +{ + if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) { + vfs_dq_init(inode); + if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) + return 1; + } + return 0; +} + + /* * Write info of quota file to disk */ @@ -1265,9 +1516,9 @@ int dquot_commit_info(struct super_block *sb, int type) int ret; struct quota_info *dqopt = sb_dqopt(sb); - down(&dqopt->dqio_sem); + mutex_lock(&dqopt->dqio_mutex); ret = dqopt->ops[type]->write_file_info(sb, type); - up(&dqopt->dqio_sem); + mutex_unlock(&dqopt->dqio_mutex); return ret; } @@ -1294,43 +1545,73 @@ static inline void set_enable_flags(struct quota_info *dqopt, int type) switch (type) { case USRQUOTA: dqopt->flags |= DQUOT_USR_ENABLED; + dqopt->flags &= ~DQUOT_USR_SUSPENDED; break; case GRPQUOTA: dqopt->flags |= DQUOT_GRP_ENABLED; + dqopt->flags &= ~DQUOT_GRP_SUSPENDED; break; } } -static inline void reset_enable_flags(struct quota_info *dqopt, int type) +static inline void reset_enable_flags(struct quota_info *dqopt, int type, + int remount) { switch (type) { case USRQUOTA: dqopt->flags &= ~DQUOT_USR_ENABLED; + if (remount) + dqopt->flags |= DQUOT_USR_SUSPENDED; + else + dqopt->flags &= ~DQUOT_USR_SUSPENDED; break; case GRPQUOTA: dqopt->flags &= ~DQUOT_GRP_ENABLED; + if (remount) + dqopt->flags |= DQUOT_GRP_SUSPENDED; + else + dqopt->flags &= ~DQUOT_GRP_SUSPENDED; break; } } + /* * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) */ -int vfs_quota_off(struct super_block *sb, int type) +int vfs_quota_off(struct super_block *sb, int type, int remount) { - int cnt; + int cnt, ret = 0; struct quota_info *dqopt = sb_dqopt(sb); struct inode *toputinode[MAXQUOTAS]; /* We need to serialize quota_off() for device */ - down(&dqopt->dqonoff_sem); + mutex_lock(&dqopt->dqonoff_mutex); + + /* + * Skip everything if there's nothing to do. We have to do this because + * sometimes we are called when fill_super() failed and calling + * sync_fs() in such cases does no good. + */ + if (!sb_any_quota_enabled(sb) && !sb_any_quota_suspended(sb)) { + mutex_unlock(&dqopt->dqonoff_mutex); + return 0; + } for (cnt = 0; cnt < MAXQUOTAS; cnt++) { toputinode[cnt] = NULL; if (type != -1 && cnt != type) continue; + /* If we keep inodes of quota files after remount and quotaoff + * is called, drop kept inodes. */ + if (!remount && sb_has_quota_suspended(sb, cnt)) { + iput(dqopt->files[cnt]); + dqopt->files[cnt] = NULL; + reset_enable_flags(dqopt, cnt, 0); + continue; + } if (!sb_has_quota_enabled(sb, cnt)) continue; - reset_enable_flags(dqopt, cnt); + reset_enable_flags(dqopt, cnt, remount); /* Note: these are blocking operations */ drop_dquot_ref(sb, cnt); @@ -1346,13 +1627,14 @@ int vfs_quota_off(struct super_block *sb, int type) put_quota_format(dqopt->info[cnt].dqi_format); toputinode[cnt] = dqopt->files[cnt]; - dqopt->files[cnt] = NULL; + if (!remount) + dqopt->files[cnt] = NULL; dqopt->info[cnt].dqi_flags = 0; dqopt->info[cnt].dqi_igrace = 0; dqopt->info[cnt].dqi_bgrace = 0; dqopt->ops[cnt] = NULL; } - up(&dqopt->dqonoff_sem); + mutex_unlock(&dqopt->dqonoff_mutex); /* Sync the superblock so that buffers with quota data are written to * disk (and so userspace sees correct data afterwards). */ if (sb->s_op->sync_fs) @@ -1365,23 +1647,30 @@ int vfs_quota_off(struct super_block *sb, int type) * changes done by userspace on the next quotaon() */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (toputinode[cnt]) { - down(&dqopt->dqonoff_sem); + mutex_lock(&dqopt->dqonoff_mutex); /* If quota was reenabled in the meantime, we have * nothing to do */ if (!sb_has_quota_enabled(sb, cnt)) { - down(&toputinode[cnt]->i_sem); + mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA); toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | S_NOATIME | S_NOQUOTA); truncate_inode_pages(&toputinode[cnt]->i_data, 0); - up(&toputinode[cnt]->i_sem); + mutex_unlock(&toputinode[cnt]->i_mutex); mark_inode_dirty(toputinode[cnt]); - iput(toputinode[cnt]); } - up(&dqopt->dqonoff_sem); + mutex_unlock(&dqopt->dqonoff_mutex); + /* On remount RO, we keep the inode pointer so that we + * can reenable quota on the subsequent remount RW. + * But we have better not keep inode pointer when there + * is pending delete on the quota file... */ + if (!remount) + iput(toputinode[cnt]); + else if (!toputinode[cnt]->i_nlink) + ret = -EBUSY; } if (sb->s_bdev) - invalidate_bdev(sb->s_bdev, 0); - return 0; + invalidate_bdev(sb->s_bdev); + return ret; } /* @@ -1416,10 +1705,11 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id) * we see all the changes from userspace... */ write_inode_now(inode, 1); /* And now flush the block cache so that kernel sees the changes */ - invalidate_bdev(sb->s_bdev, 0); - down(&inode->i_sem); - down(&dqopt->dqonoff_sem); - if (sb_has_quota_enabled(sb, type)) { + invalidate_bdev(sb->s_bdev); + mutex_lock(&inode->i_mutex); + mutex_lock(&dqopt->dqonoff_mutex); + if (sb_has_quota_enabled(sb, type) || + sb_has_quota_suspended(sb, type)) { error = -EBUSY; goto out_lock; } @@ -1442,18 +1732,19 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id) dqopt->ops[type] = fmt->qf_ops; dqopt->info[type].dqi_format = fmt; + dqopt->info[type].dqi_fmt_id = format_id; INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); - down(&dqopt->dqio_sem); + mutex_lock(&dqopt->dqio_mutex); if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) { - up(&dqopt->dqio_sem); + mutex_unlock(&dqopt->dqio_mutex); goto out_file_init; } - up(&dqopt->dqio_sem); - up(&inode->i_sem); + mutex_unlock(&dqopt->dqio_mutex); + mutex_unlock(&inode->i_mutex); set_enable_flags(dqopt, type); add_dquot_ref(sb, type); - up(&dqopt->dqonoff_sem); + mutex_unlock(&dqopt->dqonoff_mutex); return 0; @@ -1461,7 +1752,7 @@ out_file_init: dqopt->files[type] = NULL; iput(inode); out_lock: - up(&dqopt->dqonoff_sem); + mutex_unlock(&dqopt->dqonoff_mutex); if (oldflags != -1) { down_write(&dqopt->dqptr_sem); /* Set the flags back (in the case of accidental quotaon() @@ -1470,32 +1761,68 @@ out_lock: inode->i_flags |= oldflags; up_write(&dqopt->dqptr_sem); } - up(&inode->i_sem); + mutex_unlock(&inode->i_mutex); out_fmt: put_quota_format(fmt); return error; } -/* Actual function called from quotactl() */ -int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path) +/* Reenable quotas on remount RW */ +static int vfs_quota_on_remount(struct super_block *sb, int type) { - struct nameidata nd; - int error; + struct quota_info *dqopt = sb_dqopt(sb); + struct inode *inode; + int ret; - error = path_lookup(path, LOOKUP_FOLLOW, &nd); - if (error < 0) - return error; - error = security_quota_on(nd.dentry); + mutex_lock(&dqopt->dqonoff_mutex); + if (!sb_has_quota_suspended(sb, type)) { + mutex_unlock(&dqopt->dqonoff_mutex); + return 0; + } + BUG_ON(sb_has_quota_enabled(sb, type)); + + inode = dqopt->files[type]; + dqopt->files[type] = NULL; + reset_enable_flags(dqopt, type, 0); + mutex_unlock(&dqopt->dqonoff_mutex); + + ret = vfs_quota_on_inode(inode, type, dqopt->info[type].dqi_fmt_id); + iput(inode); + + return ret; +} + +int vfs_quota_on_path(struct super_block *sb, int type, int format_id, + struct path *path) +{ + int error = security_quota_on(path->dentry); if (error) - goto out_path; + return error; /* Quota file not on the same filesystem? */ - if (nd.mnt->mnt_sb != sb) + if (path->mnt->mnt_sb != sb) error = -EXDEV; else - error = vfs_quota_on_inode(nd.dentry->d_inode, type, format_id); -out_path: - path_release(&nd); + error = vfs_quota_on_inode(path->dentry->d_inode, type, + format_id); + return error; +} + +/* Actual function called from quotactl() */ +int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path, + int remount) +{ + struct nameidata nd; + int error; + + if (remount) + return vfs_quota_on_remount(sb, type); + + error = path_lookup(path, LOOKUP_FOLLOW, &nd); + if (!error) { + error = vfs_quota_on_path(sb, type, format_id, &nd.path); + path_put(&nd.path); + } return error; } @@ -1527,6 +1854,22 @@ out: return error; } +/* Wrapper to turn on quotas when remounting rw */ +int vfs_dq_quota_on_remount(struct super_block *sb) +{ + int cnt; + int ret = 0, err; + + if (!sb->s_qcop || !sb->s_qcop->quota_on) + return -ENOSYS; + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); + if (err < 0 && !ret) + ret = err; + } + return ret; +} + /* Generic routine for getting common part of quota structure */ static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) { @@ -1549,22 +1892,31 @@ int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d { struct dquot *dquot; - down(&sb_dqopt(sb)->dqonoff_sem); + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); if (!(dquot = dqget(sb, id, type))) { - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return -ESRCH; } do_get_dqblk(dquot, di); dqput(dquot); - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return 0; } /* Generic routine for setting common part of quota structure */ -static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) +static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) { struct mem_dqblk *dm = &dquot->dq_dqb; int check_blim = 0, check_ilim = 0; + struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; + + if ((di->dqb_valid & QIF_BLIMITS && + (di->dqb_bhardlimit > dqi->dqi_maxblimit || + di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || + (di->dqb_valid & QIF_ILIMITS && + (di->dqb_ihardlimit > dqi->dqi_maxilimit || + di->dqb_isoftlimit > dqi->dqi_maxilimit))) + return -ERANGE; spin_lock(&dq_data_lock); if (di->dqb_valid & QIF_SPACE) { @@ -1596,7 +1948,7 @@ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) clear_bit(DQ_BLKS_B, &dquot->dq_flags); } else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */ - dm->dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace; + dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; } if (check_ilim) { if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) { @@ -1604,7 +1956,7 @@ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) clear_bit(DQ_INODES_B, &dquot->dq_flags); } else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */ - dm->dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; + dm->dqb_itime = get_seconds() + dqi->dqi_igrace; } if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit) clear_bit(DQ_FAKE_B, &dquot->dq_flags); @@ -1612,21 +1964,24 @@ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) set_bit(DQ_FAKE_B, &dquot->dq_flags); spin_unlock(&dq_data_lock); mark_dquot_dirty(dquot); + + return 0; } int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) { struct dquot *dquot; + int rc; - down(&sb_dqopt(sb)->dqonoff_sem); + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); if (!(dquot = dqget(sb, id, type))) { - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return -ESRCH; } - do_set_dqblk(dquot, di); + rc = do_set_dqblk(dquot, di); dqput(dquot); - up(&sb_dqopt(sb)->dqonoff_sem); - return 0; + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); + return rc; } /* Generic routine for getting common part of quota file information */ @@ -1634,9 +1989,9 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) { struct mem_dqinfo *mi; - down(&sb_dqopt(sb)->dqonoff_sem); + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); if (!sb_has_quota_enabled(sb, type)) { - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return -ESRCH; } mi = sb_dqopt(sb)->info + type; @@ -1646,7 +2001,7 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) ii->dqi_flags = mi->dqi_flags & DQF_MASK; ii->dqi_valid = IIF_ALL; spin_unlock(&dq_data_lock); - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return 0; } @@ -1655,9 +2010,9 @@ int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) { struct mem_dqinfo *mi; - down(&sb_dqopt(sb)->dqonoff_sem); + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); if (!sb_has_quota_enabled(sb, type)) { - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return -ESRCH; } mi = sb_dqopt(sb)->info + type; @@ -1672,7 +2027,7 @@ int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) mark_info_dirty(sb, type); /* Force write to disk */ sb->dq_op->write_info(sb, type); - up(&sb_dqopt(sb)->dqonoff_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return 0; } @@ -1751,6 +2106,7 @@ static ctl_table fs_dqstats_table[] = { .mode = 0444, .proc_handler = &proc_dointvec, }, +#ifdef CONFIG_PRINT_QUOTA_WARNING { .ctl_name = FS_DQ_WARNINGS, .procname = "warnings", @@ -1759,6 +2115,7 @@ static ctl_table fs_dqstats_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, +#endif { .ctl_name = 0 }, }; @@ -1789,12 +2146,13 @@ static int __init dquot_init(void) printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); - register_sysctl_table(sys_table, 0); + register_sysctl_table(sys_table); - dquot_cachep = kmem_cache_create("dquot", + dquot_cachep = kmem_cache_create("dquot", sizeof(struct dquot), sizeof(unsigned long) * 4, - SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_PANIC, - NULL, NULL); + (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD|SLAB_PANIC), + NULL); order = 0; dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); @@ -1817,7 +2175,12 @@ static int __init dquot_init(void) printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); - set_shrinker(DEFAULT_SEEKS, shrink_dqcache_memory); + register_shrinker(&dqcache_shrinker); + +#ifdef CONFIG_QUOTA_NETLINK_INTERFACE + if (genl_register_family("a_genl_family) != 0) + printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n"); +#endif return 0; } @@ -1828,6 +2191,7 @@ EXPORT_SYMBOL(unregister_quota_format); EXPORT_SYMBOL(dqstats); EXPORT_SYMBOL(dq_data_lock); EXPORT_SYMBOL(vfs_quota_on); +EXPORT_SYMBOL(vfs_quota_on_path); EXPORT_SYMBOL(vfs_quota_on_mount); EXPORT_SYMBOL(vfs_quota_off); EXPORT_SYMBOL(vfs_quota_sync); @@ -1842,8 +2206,11 @@ EXPORT_SYMBOL(dquot_release); EXPORT_SYMBOL(dquot_mark_dquot_dirty); EXPORT_SYMBOL(dquot_initialize); EXPORT_SYMBOL(dquot_drop); +EXPORT_SYMBOL(vfs_dq_drop); EXPORT_SYMBOL(dquot_alloc_space); EXPORT_SYMBOL(dquot_alloc_inode); EXPORT_SYMBOL(dquot_free_space); EXPORT_SYMBOL(dquot_free_inode); EXPORT_SYMBOL(dquot_transfer); +EXPORT_SYMBOL(vfs_dq_transfer); +EXPORT_SYMBOL(vfs_dq_quota_on_remount);