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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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18
fs/ext3/inode.c
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@@ -1378,7 +1378,7 @@ static int ext3_journalled_write_end(struct file *file,
*/
if (pos + len > inode->i_size && ext3_can_truncate(inode))
ext3_orphan_add(handle, inode);
EXT3_I(inode)->i_state |= EXT3_STATE_JDATA;
ext3_set_inode_state(inode, EXT3_STATE_JDATA);
if (inode->i_size > EXT3_I(inode)->i_disksize) {
EXT3_I(inode)->i_disksize = inode->i_size;
ret2 = ext3_mark_inode_dirty(handle, inode);
@@ -1417,7 +1417,7 @@ static sector_t ext3_bmap(struct address_space *mapping, sector_t block)
journal_t *journal;
int err;
if (EXT3_I(inode)->i_state & EXT3_STATE_JDATA) {
if (ext3_test_inode_state(inode, EXT3_STATE_JDATA)) {
/*
* This is a REALLY heavyweight approach, but the use of
* bmap on dirty files is expected to be extremely rare:
@@ -1436,7 +1436,7 @@ static sector_t ext3_bmap(struct address_space *mapping, sector_t block)
* everything they get.
*/
EXT3_I(inode)->i_state &= ~EXT3_STATE_JDATA;
ext3_clear_inode_state(inode, EXT3_STATE_JDATA);
journal = EXT3_JOURNAL(inode);
journal_lock_updates(journal);
err = journal_flush(journal);
@@ -1670,7 +1670,7 @@ static int ext3_journalled_writepage(struct page *page,
PAGE_CACHE_SIZE, NULL, write_end_fn);
if (ret == 0)
ret = err;
EXT3_I(inode)->i_state |= EXT3_STATE_JDATA;
ext3_set_inode_state(inode, EXT3_STATE_JDATA);
unlock_page(page);
} else {
/*
@@ -2402,7 +2402,7 @@ void ext3_truncate(struct inode *inode)
goto out_notrans;
if (inode->i_size == 0 && ext3_should_writeback_data(inode))
ei->i_state |= EXT3_STATE_FLUSH_ON_CLOSE;
ext3_set_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE);
/*
* We have to lock the EOF page here, because lock_page() nests
@@ -2721,7 +2721,7 @@ int ext3_get_inode_loc(struct inode *inode, struct ext3_iloc *iloc)
{
/* We have all inode data except xattrs in memory here. */
return __ext3_get_inode_loc(inode, iloc,
!(EXT3_I(inode)->i_state & EXT3_STATE_XATTR));
!ext3_test_inode_state(inode, EXT3_STATE_XATTR));
}
void ext3_set_inode_flags(struct inode *inode)
@@ -2893,7 +2893,7 @@ struct inode *ext3_iget(struct super_block *sb, unsigned long ino)
EXT3_GOOD_OLD_INODE_SIZE +
ei->i_extra_isize;
if (*magic == cpu_to_le32(EXT3_XATTR_MAGIC))
ei->i_state |= EXT3_STATE_XATTR;
ext3_set_inode_state(inode, EXT3_STATE_XATTR);
}
} else
ei->i_extra_isize = 0;
@@ -2955,7 +2955,7 @@ again:
/* For fields not not tracking in the in-memory inode,
* initialise them to zero for new inodes. */
if (ei->i_state & EXT3_STATE_NEW)
if (ext3_test_inode_state(inode, EXT3_STATE_NEW))
memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size);
ext3_get_inode_flags(ei);
@@ -3052,7 +3052,7 @@ again:
rc = ext3_journal_dirty_metadata(handle, bh);
if (!err)
err = rc;
ei->i_state &= ~EXT3_STATE_NEW;
ext3_clear_inode_state(inode, EXT3_STATE_NEW);
atomic_set(&ei->i_sync_tid, handle->h_transaction->t_tid);
out_brelse: