ext4: add more error checks to ext4_mkdir()
Check return value of ext4_journal_get_write_access,
ext4_journal_dirty_metadata and ext4_mark_inode_dirty. Move brelse()
under 'out_stop' to release bh properly in case of journal error.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 96a594d..6dfc5b9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1789,7 +1789,7 @@
{
handle_t *handle;
struct inode *inode;
- struct buffer_head *dir_block;
+ struct buffer_head *dir_block = NULL;
struct ext4_dir_entry_2 *de;
unsigned int blocksize = dir->i_sb->s_blocksize;
int err, retries = 0;
@@ -1822,7 +1822,9 @@
if (!dir_block)
goto out_clear_inode;
BUFFER_TRACE(dir_block, "get_write_access");
- ext4_journal_get_write_access(handle, dir_block);
+ err = ext4_journal_get_write_access(handle, dir_block);
+ if (err)
+ goto out_clear_inode;
de = (struct ext4_dir_entry_2 *) dir_block->b_data;
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
@@ -1839,10 +1841,12 @@
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
inode->i_nlink = 2;
BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
- ext4_handle_dirty_metadata(handle, dir, dir_block);
- brelse(dir_block);
- ext4_mark_inode_dirty(handle, inode);
- err = ext4_add_entry(handle, dentry, inode);
+ err = ext4_handle_dirty_metadata(handle, dir, dir_block);
+ if (err)
+ goto out_clear_inode;
+ err = ext4_mark_inode_dirty(handle, inode);
+ if (!err)
+ err = ext4_add_entry(handle, dentry, inode);
if (err) {
out_clear_inode:
clear_nlink(inode);
@@ -1853,10 +1857,13 @@
}
ext4_inc_count(handle, dir);
ext4_update_dx_flag(dir);
- ext4_mark_inode_dirty(handle, dir);
+ err = ext4_mark_inode_dirty(handle, dir);
+ if (err)
+ goto out_clear_inode;
d_instantiate(dentry, inode);
unlock_new_inode(inode);
out_stop:
+ brelse(dir_block);
ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;