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| author | Theodore Ts'o <tytso@mit.edu> | 2009-11-23 13:17:34 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-11-23 13:17:34 +0100 |
| commit | 50689696867d95b38d9c7be640a311494a04fb86 (patch) | |
| tree | 69e582bb6c95d8d0ac59bcad97b5f7f1d79e7126 /fs/ext4/inode.c | |
| parent | ext4: add tracepoint for ext4_forget() (diff) | |
| download | linux-50689696867d95b38d9c7be640a311494a04fb86.tar.xz linux-50689696867d95b38d9c7be640a311494a04fb86.zip | |
ext4: make sure directory and symlink blocks are revoked
When an inode gets unlinked, the functions ext4_clear_blocks() and
ext4_remove_blocks() call ext4_forget() for all the buffer heads
corresponding to the deleted inode's data blocks. If the inode is a
directory or a symlink, the is_metadata parameter must be non-zero so
ext4_forget() will revoke them via jbd2_journal_revoke(). Otherwise,
if these blocks are reused for a data file, and the system crashes
before a journal checkpoint, the journal replay could end up
corrupting these data blocks.
Thanks to Curt Wohlgemuth for pointing out potential problems in this
area.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to '')
| -rw-r--r-- | fs/ext4/inode.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 13de1dd751f5..c420aaba6e9c 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4121,6 +4121,8 @@ static void ext4_clear_blocks(handle_t *handle, struct inode *inode, __le32 *last) { __le32 *p; + int is_metadata = S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode); + if (try_to_extend_transaction(handle, inode)) { if (bh) { BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); @@ -4151,11 +4153,11 @@ static void ext4_clear_blocks(handle_t *handle, struct inode *inode, *p = 0; tbh = sb_find_get_block(inode->i_sb, nr); - ext4_forget(handle, 0, inode, tbh, nr); + ext4_forget(handle, is_metadata, inode, tbh, nr); } } - ext4_free_blocks(handle, inode, block_to_free, count, 0); + ext4_free_blocks(handle, inode, block_to_free, count, is_metadata); } /** |