From 3d9ea253a0e73dccaa869888ec2ceb17ea76c810 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Fri, 10 Oct 2008 16:12:23 +0200 Subject: quota: Add helpers to allow ocfs2 specific quota initialization, freeing and recovery OCFS2 needs to peek whether quota structure is already in memory so that it can avoid expensive cluster locking in that case. Similarly when freeing dquots, it checks whether it is the last quota structure user or not. Finally, it needs to get reference to dquot structure for specified id and quota type when recovering quota file after crash. Signed-off-by: Jan Kara Signed-off-by: Mark Fasheh --- fs/dquot.c | 38 ++++++++++++++++++++++++++++++++------ 1 file changed, 32 insertions(+), 6 deletions(-) (limited to 'fs/dquot.c') diff --git a/fs/dquot.c b/fs/dquot.c index 89226726daa8..ae8fd9e645cc 100644 --- a/fs/dquot.c +++ b/fs/dquot.c @@ -211,8 +211,6 @@ static struct hlist_head *dquot_hash; struct dqstats dqstats; -static void dqput(struct dquot *dquot); - static inline unsigned int hashfn(const struct super_block *sb, unsigned int id, int type) { @@ -568,7 +566,7 @@ static struct shrinker dqcache_shrinker = { * NOTE: If you change this function please check whether dqput_blocks() works right... * MUST be called with either dqptr_sem or dqonoff_mutex held */ -static void dqput(struct dquot *dquot) +void dqput(struct dquot *dquot) { int ret; @@ -661,11 +659,29 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type) return dquot; } +/* + * Check whether dquot is in memory. + * MUST be called with either dqptr_sem or dqonoff_mutex held + */ +int dquot_is_cached(struct super_block *sb, unsigned int id, int type) +{ + unsigned int hashent = hashfn(sb, id, type); + int ret = 0; + + if (!sb_has_quota_active(sb, type)) + return 0; + spin_lock(&dq_list_lock); + if (find_dquot(hashent, sb, id, type) != NODQUOT) + ret = 1; + spin_unlock(&dq_list_lock); + return ret; +} + /* * Get reference to dquot * MUST be called with either dqptr_sem or dqonoff_mutex held */ -static struct dquot *dqget(struct super_block *sb, unsigned int id, int type) +struct dquot *dqget(struct super_block *sb, unsigned int id, int type) { unsigned int hashent = hashfn(sb, id, type); struct dquot *dquot, *empty = NODQUOT; @@ -1184,17 +1200,23 @@ out_err: * Release all quotas referenced by inode * Transaction must be started at an entry */ -int dquot_drop(struct inode *inode) +int dquot_drop_locked(struct inode *inode) { int cnt; - down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (inode->i_dquot[cnt] != NODQUOT) { dqput(inode->i_dquot[cnt]); inode->i_dquot[cnt] = NODQUOT; } } + return 0; +} + +int dquot_drop(struct inode *inode) +{ + down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); + dquot_drop_locked(inode); up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); return 0; } @@ -2308,7 +2330,11 @@ EXPORT_SYMBOL(dquot_release); EXPORT_SYMBOL(dquot_mark_dquot_dirty); EXPORT_SYMBOL(dquot_initialize); EXPORT_SYMBOL(dquot_drop); +EXPORT_SYMBOL(dquot_drop_locked); EXPORT_SYMBOL(vfs_dq_drop); +EXPORT_SYMBOL(dqget); +EXPORT_SYMBOL(dqput); +EXPORT_SYMBOL(dquot_is_cached); EXPORT_SYMBOL(dquot_alloc_space); EXPORT_SYMBOL(dquot_alloc_inode); EXPORT_SYMBOL(dquot_free_space); -- cgit v1.2.3-59-g8ed1b