ext4: Properly count journal credits for long symlinks

Commit df5e6223407e ("ext4: fix deadlock in ext4_symlink() in ENOSPC
conditions") recalculated the number of credits needed for a long
symlink, in the process of splitting it into two transactions.  However,
the first credit calculation under-counted because if selinux is
enabled, credits are needed to create the selinux xattr as well.

Overrunning the reservation will result in an OOPS in
jbd2_journal_dirty_metadata() due to this assert:

  J_ASSERT_JH(jh, handle->h_buffer_credits > 0);

Fix this by increasing the reservation size.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 565a154..f8068c7 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2253,9 +2253,11 @@ static int ext4_symlink(struct inode *dir,
                /*
                 * For non-fast symlinks, we just allocate inode and put it on
                 * orphan list in the first transaction => we need bitmap,
-                * group descriptor, sb, inode block, quota blocks.
+                * group descriptor, sb, inode block, quota blocks, and
+                * possibly selinux xattr blocks.
                 */
-               credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
+               credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
+                         EXT4_XATTR_TRANS_BLOCKS;
        } else {
                /*
                 * Fast symlink. We have to add entry to directory