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ext4: Use bitops to read/modify EXT4_I(inode)->i_state

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At several places we modify EXT4_I(inode)->i_state without holding
i_mutex (ext4_release_file, ext4_bmap, ext4_journalled_writepage,
ext4_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.

Cc: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2010-01-24 14:34:07 -05:00
parent d2eecb0393
commit 19f5fb7ad6
7 changed files with 71 additions and 51 deletions
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4
fs/ext4/file.c
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@@ -35,9 +35,9 @@
*/
static int ext4_release_file(struct inode *inode, struct file *filp)
{
if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) {
if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
ext4_alloc_da_blocks(inode);
EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE;
ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
}
/* if we are the last writer on the inode, drop the block reservation */
if ((filp->f_mode & FMODE_WRITE) &&