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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2010-05-16 22:00:00 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-05-16 22:00:00 -0400 |
| commit | 12e9b892002d9af057655d35b44db8ee9243b0dc (patch) | |
| tree | c5831b4bcf98eebdd39158d08dab97c198f5c683 /fs/ext4/extents.c | |
| parent | 24676da469f50f433baa347845639662c561d1f6 (diff) | |
| download | linux-12e9b892002d9af057655d35b44db8ee9243b0dc.tar.gz linux-12e9b892002d9af057655d35b44db8ee9243b0dc.tar.bz2 linux-12e9b892002d9af057655d35b44db8ee9243b0dc.zip | |
ext4: Use bitops to read/modify i_flags in struct ext4_inode_info
At several places we modify EXT4_I(inode)->i_flags without holding
i_mutex (ext4_do_update_inode, ...). These modifications are racy and
we can lose updates to i_flags. So convert handling of i_flags to use
bitops which are atomic.
https://bugzilla.kernel.org/show_bug.cgi?id=15792
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 91c3873970e4..42d8ce91adbd 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3498,7 +3498,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, map->m_flags |= EXT4_MAP_UNINIT; } - if (unlikely(EXT4_I(inode)->i_flags & EXT4_EOFBLOCKS_FL)) { + if (unlikely(ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS))) { if (unlikely(!eh->eh_entries)) { EXT4_ERROR_INODE(inode, "eh->eh_entries == 0 ee_block %d", @@ -3509,7 +3509,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, last_ex = EXT_LAST_EXTENT(eh); if (map->m_lblk + ar.len > le32_to_cpu(last_ex->ee_block) + ext4_ext_get_actual_len(last_ex)) - EXT4_I(inode)->i_flags &= ~EXT4_EOFBLOCKS_FL; + ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); } err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); if (err) { @@ -3650,7 +3650,7 @@ static void ext4_falloc_update_inode(struct inode *inode, * can proceed even if the new size is the same as i_size. */ if (new_size > i_size_read(inode)) - EXT4_I(inode)->i_flags |= EXT4_EOFBLOCKS_FL; + ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS); } } @@ -3677,7 +3677,7 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len) * currently supporting (pre)allocate mode for extent-based * files _only_ */ - if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) + if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) return -EOPNOTSUPP; /* preallocation to directories is currently not supported */ @@ -3922,7 +3922,7 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, int error = 0; /* fallback to generic here if not in extents fmt */ - if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) + if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) return generic_block_fiemap(inode, fieinfo, start, len, ext4_get_block); |