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ext4: Fix remaining racy updates of EXT4_I(inode)->i_flags 

A few functions were still modifying i_flags in a racy manner.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Dmitry Monakhov 2010-06-05 11:51:27 -04:00 коммит произвёл Theodore Ts'o
Родитель 1f5a81e41f
Коммит 84a8dce271
1 изменённых файлов: 22 добавлений и 16 удалений
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38
fs/ext4/inode.c
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@ -4942,20 +4942,26 @@ void ext4_set_inode_flags(struct inode *inode)
/* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
void ext4_get_inode_flags(struct ext4_inode_info *ei) void ext4_get_inode_flags(struct ext4_inode_info *ei)
{ {
unsigned int flags = ei->vfs_inode.i_flags; unsigned int vfs_fl;
unsigned long old_fl, new_fl;
ei->i_flags &= ~(EXT4_SYNC_FL|EXT4_APPEND_FL| do {
EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL|EXT4_DIRSYNC_FL); vfs_fl = ei->vfs_inode.i_flags;
if (flags & S_SYNC) old_fl = ei->i_flags;
ei->i_flags |= EXT4_SYNC_FL; new_fl = old_fl & ~(EXT4_SYNC_FL|EXT4_APPEND_FL|
if (flags & S_APPEND) EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL|
ei->i_flags |= EXT4_APPEND_FL; EXT4_DIRSYNC_FL);
if (flags & S_IMMUTABLE) if (vfs_fl & S_SYNC)
ei->i_flags |= EXT4_IMMUTABLE_FL; new_fl |= EXT4_SYNC_FL;
if (flags & S_NOATIME) if (vfs_fl & S_APPEND)
ei->i_flags |= EXT4_NOATIME_FL; new_fl |= EXT4_APPEND_FL;
if (flags & S_DIRSYNC) if (vfs_fl & S_IMMUTABLE)
ei->i_flags |= EXT4_DIRSYNC_FL; new_fl |= EXT4_IMMUTABLE_FL;
if (vfs_fl & S_NOATIME)
new_fl |= EXT4_NOATIME_FL;
if (vfs_fl & S_DIRSYNC)
new_fl |= EXT4_DIRSYNC_FL;
} while (cmpxchg(&ei->i_flags, old_fl, new_fl) != old_fl);
} }
static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
@ -5191,7 +5197,7 @@ static int ext4_inode_blocks_set(handle_t *handle,
*/ */
raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
raw_inode->i_blocks_high = 0; raw_inode->i_blocks_high = 0;
ei->i_flags &= ~EXT4_HUGE_FILE_FL; ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE);
return 0; return 0;
} }
if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE))
@ -5204,9 +5210,9 @@ static int ext4_inode_blocks_set(handle_t *handle,
*/ */
raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
ei->i_flags &= ~EXT4_HUGE_FILE_FL; ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE);
} else { } else {
ei->i_flags |= EXT4_HUGE_FILE_FL; ext4_set_inode_flag(inode, EXT4_INODE_HUGE_FILE);
/* i_block is stored in file system block size */ /* i_block is stored in file system block size */
i_blocks = i_blocks >> (inode->i_blkbits - 9); i_blocks = i_blocks >> (inode->i_blkbits - 9);
raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);