From 4e9eb2afbc494a56e35bf6c1a621f579eb1199b2 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Sat, 17 Aug 2013 09:32:32 -0400 Subject: quota: provide interface for readding allocated space into reserved space commit 1c8924eb106c1ac755d5d35ce9b3ff42e89e2511 upstream. ext4 needs to convert allocated (metadata) blocks back into blocks reserved for delayed allocation. Add functions into quota code for supporting such operation. Signed-off-by: Jan Kara Signed-off-by: "Theodore Ts'o" Cc: Josh Hunt Signed-off-by: Greg Kroah-Hartman --- fs/quota/dquot.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ fs/stat.c | 11 +++++++++-- 2 files changed, 55 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 7a10e047bc33..4f7f451ca70d 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -1102,6 +1102,14 @@ static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) dquot->dq_dqb.dqb_rsvspace -= number; } +static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) +{ + if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) + number = dquot->dq_dqb.dqb_curspace; + dquot->dq_dqb.dqb_rsvspace += number; + dquot->dq_dqb.dqb_curspace -= number; +} + static inline void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) { @@ -1536,6 +1544,15 @@ void inode_claim_rsv_space(struct inode *inode, qsize_t number) } EXPORT_SYMBOL(inode_claim_rsv_space); +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); + spin_unlock(&inode->i_lock); +} +EXPORT_SYMBOL(inode_reclaim_rsv_space); + void inode_sub_rsv_space(struct inode *inode, qsize_t number) { spin_lock(&inode->i_lock); @@ -1709,6 +1726,35 @@ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) } EXPORT_SYMBOL(dquot_claim_space_nodirty); +/* + * Convert allocated space back to in-memory reserved quotas + */ +void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) +{ + int cnt; + + if (!dquot_active(inode)) { + inode_reclaim_rsv_space(inode, number); + return; + } + + down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + spin_lock(&dq_data_lock); + /* Claim reserved quotas to allocated quotas */ + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + if (inode->i_dquot[cnt]) + dquot_reclaim_reserved_space(inode->i_dquot[cnt], + number); + } + /* Update inode bytes */ + inode_reclaim_rsv_space(inode, number); + spin_unlock(&dq_data_lock); + mark_all_dquot_dirty(inode->i_dquot); + up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + return; +} +EXPORT_SYMBOL(dquot_reclaim_space_nodirty); + /* * This operation can block, but only after everything is updated */ diff --git a/fs/stat.c b/fs/stat.c index 04ce1ac20d20..d0ea7ef75e26 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -447,9 +447,8 @@ void inode_add_bytes(struct inode *inode, loff_t bytes) EXPORT_SYMBOL(inode_add_bytes); -void inode_sub_bytes(struct inode *inode, loff_t bytes) +void __inode_sub_bytes(struct inode *inode, loff_t bytes) { - spin_lock(&inode->i_lock); inode->i_blocks -= bytes >> 9; bytes &= 511; if (inode->i_bytes < bytes) { @@ -457,6 +456,14 @@ void inode_sub_bytes(struct inode *inode, loff_t bytes) inode->i_bytes += 512; } inode->i_bytes -= bytes; +} + +EXPORT_SYMBOL(__inode_sub_bytes); + +void inode_sub_bytes(struct inode *inode, loff_t bytes) +{ + spin_lock(&inode->i_lock); + __inode_sub_bytes(inode, bytes); spin_unlock(&inode->i_lock); } -- cgit v1.2.3