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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2010-05-17 01:00:00 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-05-17 01:00:00 -0400 |
| commit | 0617b83fa239db9743a18ce6cc0e556f4d0fd567 (patch) | |
| tree | 46d646c2d1af9d706848520a4657877d4cff768f /fs | |
| parent | 786ec7915e530936b9eb2e3d12274145cab7aa7d (diff) | |
| download | blackbird-op-linux-0617b83fa239db9743a18ce6cc0e556f4d0fd567.tar.gz blackbird-op-linux-0617b83fa239db9743a18ce6cc0e556f4d0fd567.zip | |
ext4: restart ext4_ext_remove_space() after transaction restart
If i_data_sem was internally dropped due to transaction restart, it is
necessary to restart path look-up because extents tree was possibly
modified by ext4_get_block().
https://bugzilla.kernel.org/show_bug.cgi?id=15827
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Acked-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/extents.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index ffcaa1137def..0a47becf668a 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -107,11 +107,8 @@ static int ext4_ext_truncate_extend_restart(handle_t *handle, if (err <= 0) return err; err = ext4_truncate_restart_trans(handle, inode, needed); - /* - * We have dropped i_data_sem so someone might have cached again - * an extent we are going to truncate. - */ - ext4_ext_invalidate_cache(inode); + if (err == 0) + err = -EAGAIN; return err; } @@ -2359,7 +2356,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start) int depth = ext_depth(inode); struct ext4_ext_path *path; handle_t *handle; - int i = 0, err = 0; + int i, err; ext_debug("truncate since %u\n", start); @@ -2368,23 +2365,26 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start) if (IS_ERR(handle)) return PTR_ERR(handle); +again: ext4_ext_invalidate_cache(inode); /* * We start scanning from right side, freeing all the blocks * after i_size and walking into the tree depth-wise. */ + depth = ext_depth(inode); path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), GFP_NOFS); if (path == NULL) { ext4_journal_stop(handle); return -ENOMEM; } + path[0].p_depth = depth; path[0].p_hdr = ext_inode_hdr(inode); if (ext4_ext_check(inode, path[0].p_hdr, depth)) { err = -EIO; goto out; } - path[0].p_depth = depth; + i = err = 0; while (i >= 0 && err == 0) { if (i == depth) { @@ -2478,6 +2478,8 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start) out: ext4_ext_drop_refs(path); kfree(path); + if (err == -EAGAIN) + goto again; ext4_journal_stop(handle); return err; |
