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ext3: Use bitops to read/modify EXT3_I(inode)->i_state

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At several places we modify EXT3_I(inode)->i_state without holding i_mutex
(ext3_release_file, ext3_bmap, ext3_journalled_writepage, ext3_do_update_inode,
...). These modifications are racy and we can lose updates to i_state. So
convert handling of i_state to use bitops which are atomic.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
2010-01-06 21:58:48 +01:00
parent 26245c949c
commit 9df93939b7
5 changed files with 44 additions and 27 deletions
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33
include/linux/ext3_fs.h
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@@ -202,14 +202,6 @@ static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
return flags & EXT3_OTHER_FLMASK;
}
/*
* Inode dynamic state flags
*/
#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
#define EXT3_STATE_FLUSH_ON_CLOSE 0x00000008
/* Used to pass group descriptor data when online resize is done */
struct ext3_new_group_input {
__u32 group; /* Group number for this data */
@@ -560,6 +552,31 @@ static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
(ino >= EXT3_FIRST_INO(sb) &&
ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
}
/*
* Inode dynamic state flags
*/
enum {
EXT3_STATE_JDATA, /* journaled data exists */
EXT3_STATE_NEW, /* inode is newly created */
EXT3_STATE_XATTR, /* has in-inode xattrs */
EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */
};
static inline int ext3_test_inode_state(struct inode *inode, int bit)
{
return test_bit(bit, &EXT3_I(inode)->i_state);
}
static inline void ext3_set_inode_state(struct inode *inode, int bit)
{
set_bit(bit, &EXT3_I(inode)->i_state);
}
static inline void ext3_clear_inode_state(struct inode *inode, int bit)
{
clear_bit(bit, &EXT3_I(inode)->i_state);
}
#else
/* Assume that user mode programs are passing in an ext3fs superblock, not
* a kernel struct super_block. This will allow us to call the feature-test