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ext4: Convert to generic reserved quota's space management.

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This patch also fixes write vs chown race condition.

Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Dmitry Monakhov 2009-12-14 15:21:14 +03:00 committed by Jan Kara
parent fd8fbfc170
commit a9e7f44720
3 changed files with 17 additions and 10 deletions
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6
fs/ext4/ext4.h
View file

@ -704,6 +704,10 @@ struct ext4_inode_info {
__u16 i_extra_isize; __u16 i_extra_isize;
spinlock_t i_block_reservation_lock; spinlock_t i_block_reservation_lock;
#ifdef CONFIG_QUOTA
/* quota space reservation, managed internally by quota code */
qsize_t i_reserved_quota;
#endif
/* completed async DIOs that might need unwritten extents handling */ /* completed async DIOs that might need unwritten extents handling */
struct list_head i_aio_dio_complete_list; struct list_head i_aio_dio_complete_list;
@ -1435,7 +1439,7 @@ extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
extern int ext4_block_truncate_page(handle_t *handle, extern int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from); struct address_space *mapping, loff_t from);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
extern qsize_t ext4_get_reserved_space(struct inode *inode); extern qsize_t *ext4_get_reserved_space(struct inode *inode);
extern int flush_aio_dio_completed_IO(struct inode *inode); extern int flush_aio_dio_completed_IO(struct inode *inode);
/* ioctl.c */ /* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long); extern long ext4_ioctl(struct file *, unsigned int, unsigned long);

16
fs/ext4/inode.c
View file

@ -1003,17 +1003,12 @@ out:
return err; return err;
} }
qsize_t ext4_get_reserved_space(struct inode *inode) #ifdef CONFIG_QUOTA
qsize_t *ext4_get_reserved_space(struct inode *inode)
{ {
unsigned long long total; return &EXT4_I(inode)->i_reserved_quota;
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
total = EXT4_I(inode)->i_reserved_data_blocks +
EXT4_I(inode)->i_reserved_meta_blocks;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
return (total << inode->i_blkbits);
} }
#endif
/* /*
* Calculate the number of metadata blocks need to reserve * Calculate the number of metadata blocks need to reserve
* to allocate @blocks for non extent file based file * to allocate @blocks for non extent file based file
@ -4794,6 +4789,9 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
inode->i_size = ext4_isize(raw_inode); inode->i_size = ext4_isize(raw_inode);
ei->i_disksize = inode->i_size; ei->i_disksize = inode->i_size;
#ifdef CONFIG_QUOTA
ei->i_reserved_quota = 0;
#endif
inode->i_generation = le32_to_cpu(raw_inode->i_generation); inode->i_generation = le32_to_cpu(raw_inode->i_generation);
ei->i_block_group = iloc.block_group; ei->i_block_group = iloc.block_group;
ei->i_last_alloc_group = ~0; ei->i_last_alloc_group = ~0;

5
fs/ext4/super.c
View file

@ -704,6 +704,9 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->i_allocated_meta_blocks = 0; ei->i_allocated_meta_blocks = 0;
ei->i_delalloc_reserved_flag = 0; ei->i_delalloc_reserved_flag = 0;
spin_lock_init(&(ei->i_block_reservation_lock)); spin_lock_init(&(ei->i_block_reservation_lock));
#ifdef CONFIG_QUOTA
ei->i_reserved_quota = 0;
#endif
INIT_LIST_HEAD(&ei->i_aio_dio_complete_list); INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
ei->cur_aio_dio = NULL; ei->cur_aio_dio = NULL;
ei->i_sync_tid = 0; ei->i_sync_tid = 0;
@ -1014,7 +1017,9 @@ static const struct dquot_operations ext4_quota_operations = {
.reserve_space = dquot_reserve_space, .reserve_space = dquot_reserve_space,
.claim_space = dquot_claim_space, .claim_space = dquot_claim_space,
.release_rsv = dquot_release_reserved_space, .release_rsv = dquot_release_reserved_space,
#ifdef CONFIG_QUOTA
.get_reserved_space = ext4_get_reserved_space, .get_reserved_space = ext4_get_reserved_space,
#endif
.alloc_inode = dquot_alloc_inode, .alloc_inode = dquot_alloc_inode,
.free_space = dquot_free_space, .free_space = dquot_free_space,
.free_inode = dquot_free_inode, .free_inode = dquot_free_inode,