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 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1789,7 +1789,7 @@ static int ext4_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 {
        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 @@ retry:
        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 @@ retry:
        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 @@ out_clear_inode:
        }
        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;