From: Mingming Cao Subject: [PATCH V3 2/3] quota: Add quota claim and release reserved quota blocks operations Date: Thu, 06 Nov 2008 15:36:39 -0800 Message-ID: <1226014599.6430.62.camel@mingming-laptop> References: <1225488442.7600.12.camel@mingming-laptop> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: jack@suse.cz, tytso , linux-ext4 , linux-fsdevel To: Andrew Morton Return-path: In-Reply-To: <1225488442.7600.12.camel@mingming-laptop> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org quota: Add quota reservation claim and released operations Reserved quota will be claimed at the block allocation time. Over-booked quota could be returned back with the release callback function. Signed-off-by: Mingming Cao --- fs/dquot.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++ include/linux/quota.h | 4 +- include/linux/quotaops.h | 55 +++++++++++++++++++++++++++++ 3 files changed, 145 insertions(+), 1 deletion(-) Index: linux-2.6.28-rc2/include/linux/quota.h =================================================================== --- linux-2.6.28-rc2.orig/include/linux/quota.h 2008-11-06 13:36:42.000000000 -0800 +++ linux-2.6.28-rc2/include/linux/quota.h 2008-11-06 14:03:52.000000000 -0800 @@ -292,7 +292,9 @@ struct dquot_operations { int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ - int (*reserve_space) (struct inode *, qsize_t, int); /* reserve quota for delayed block allocation */ + int (*reserve_space) (struct inode *, qsize_t, int); /* reserve quota for delayed alloc */ + int (*claim_space) (struct inode *, qsize_t); /* claim reserved quota for delayed alloc */ + void (*release_rsv) (struct inode *, qsize_t); /* release rsved quota for delayed alloc */ }; /* Operations handling requests from userspace */ Index: linux-2.6.28-rc2/include/linux/quotaops.h =================================================================== --- linux-2.6.28-rc2.orig/include/linux/quotaops.h 2008-11-06 13:37:04.000000000 -0800 +++ linux-2.6.28-rc2/include/linux/quotaops.h 2008-11-06 14:03:52.000000000 -0800 @@ -28,6 +28,11 @@ int dquot_drop(struct inode *inode); int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc); int dquot_alloc_inode(const struct inode *inode, qsize_t number); +int dquot_reserve_space(struct inode *inode, qsize_t number, int prealloc); +int dquot_claim_space(struct inode *inode, qsize_t number); +void dquot_release_reserved_space(struct inode *inode, qsize_t number); + + int dquot_free_space(struct inode *inode, qsize_t number); int dquot_free_inode(const struct inode *inode, qsize_t number); @@ -196,6 +201,31 @@ static inline int vfs_dq_alloc_inode(str return 0; } +/* + * Convert in-memory reserved quotas to real consumed quotas + */ +static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr) +{ + if (sb_any_quota_active(inode->i_sb)) { + if (inode->i_sb->dq_op->claim_space(inode, nr) == NO_QUOTA) + return 1; + } else + inode_add_bytes(inode, nr); + + mark_inode_dirty(inode); + return 0; +} + +/* + * Release reserved (in-memory) quotas + */ +static inline +void vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr) +{ + if (sb_any_quota_active(inode->i_sb)) + inode->i_sb->dq_op->release_rsv(inode, nr); +} + static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr) { if (sb_any_quota_active(inode->i_sb)) @@ -342,6 +372,17 @@ static inline int vfs_dq_reserve_space(s return 0; } +static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr) +{ + return vfs_dq_alloc_space(inode, nr); +} + +static inline +int vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr) +{ + return 0; +} + static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr) { inode_sub_bytes(inode, nr); @@ -386,6 +427,18 @@ static inline int vfs_dq_reserve_block(s nr << inode->i_blkbits); } +static inline int vfs_dq_claim_block(struct inode *inode, qsize_t nr) +{ + return vfs_dq_claim_space(inode, + nr << inode->i_blkbits); +} + +static inline +void vfs_dq_release_reservation(struct inode *inode, qsize_t nr) +{ + vfs_dq_release_reservation_space(inode, nr << inode->i_blkbits); +} + static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr) { vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits); @@ -415,6 +468,8 @@ static inline void vfs_dq_free_block(str vfs_dq_alloc_block_nodirty(inode, nr) #define DQUOT_ALLOC_BLOCK(inode, nr) vfs_dq_alloc_block(inode, nr) #define DQUOT_RESERVE_BLOCK(inode, nr) vfs_dq_reserve_block(inode, nr) +#define DQUOT_CLAIM_BLOCK(inode, nr) vfs_dq_claim_block(inode, nr) +#define DQUOT_RELEASE_RSV_BLOCK(inode, nr) vfs_dq_release_reservation(inode, nr) #define DQUOT_ALLOC_INODE(inode) vfs_dq_alloc_inode(inode) #define DQUOT_FREE_SPACE_NODIRTY(inode, nr) \ vfs_dq_free_space_nodirty(inode, nr) Index: linux-2.6.28-rc2/fs/dquot.c =================================================================== --- linux-2.6.28-rc2.orig/fs/dquot.c 2008-11-06 13:37:04.000000000 -0800 +++ linux-2.6.28-rc2/fs/dquot.c 2008-11-06 14:03:52.000000000 -0800 @@ -846,6 +846,24 @@ static inline void dquot_resv_space(stru dquot->dq_dqb.dqb_rsvspace += number; } +/* + * Claim reserved quota space + */ +static int dquot_claim_reserved_space(struct dquot *dquot, + qsize_t number) +{ + if (dquot->dq_dqb.dqb_rsvspace < number) { + printk(KERN_WARNING "Reserved quota %llu is not enough for" + "request %llu bytes\n", + (unsigned long long)dquot->dq_dqb.dqb_rsvspace, number); + return 1; + } + + dquot->dq_dqb.dqb_curspace += number; + dquot->dq_dqb.dqb_rsvspace -= number; + return 0; +} + static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number) { if (dquot->dq_dqb.dqb_curinodes > number) @@ -1319,6 +1337,73 @@ out: return ret; } +int dquot_claim_space(struct inode *inode, qsize_t number) +{ + int cnt; + int ret = QUOTA_OK; + + if (IS_NOQUOTA(inode)) { + inode_add_bytes(inode, number); + return ret; + } + + down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + if (IS_NOQUOTA(inode)) { + up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + inode_add_bytes(inode, number); + return ret; + } + + /* Claim reserved quotas to allocated quotas */ + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + if (inode->i_dquot[cnt] != NODQUOT) + ret = dquot_claim_reserved_space(inode->i_dquot[cnt], + number); + } + if (ret == NO_QUOTA) { + up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + return ret; + } + /* Dirtify all the dquots - this can block when journalling */ + for (cnt = 0; cnt < MAXQUOTAS; cnt++) + if (inode->i_dquot[cnt]) + mark_dquot_dirty(inode->i_dquot[cnt]); + up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + + /* Update inode bytes */ + inode_add_bytes(inode, number); + return ret; +} + +/* + * Release reserved quota space + */ +void dquot_release_reserved_space(struct inode *inode, qsize_t number) +{ + int cnt; + struct dquot *dquot; + + if (IS_NOQUOTA(inode)) + goto out; + + down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); + if (IS_NOQUOTA(inode)) + goto out_unlock; + + /* Release reserved dquots */ + for (cnt = 0; cnt < MAXQUOTAS; cnt++) { + if (inode->i_dquot[cnt] != NODQUOT) { + dquot = inode->i_dquot[cnt]; + dquot->dq_dqb.dqb_rsvspace -= number; + } + } + +out_unlock: + up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); +out: + return; +} + /* * This operation can block, but only after everything is updated */ @@ -2344,6 +2429,8 @@ EXPORT_SYMBOL(dquot_alloc_inode); EXPORT_SYMBOL(dquot_free_space); EXPORT_SYMBOL(dquot_free_inode); EXPORT_SYMBOL(dquot_reserve_space); +EXPORT_SYMBOL(dquot_claim_space); +EXPORT_SYMBOL(dquot_release_reserved_space); EXPORT_SYMBOL(dquot_transfer); EXPORT_SYMBOL(vfs_dq_transfer); EXPORT_SYMBOL(vfs_dq_quota_on_remount);