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    Subject[ 45/54] ext4: fix error handling on inode bitmap corruption
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jan Kara <jack@suse.cz>

    commit acd6ad83517639e8f09a8c5525b1dccd81cd2a10 upstream.

    When insert_inode_locked() fails in ext4_new_inode() it most likely means inode
    bitmap got corrupted and we allocated again inode which is already in use. Also
    doing unlock_new_inode() during error recovery is wrong since the inode does
    not have I_NEW set. Fix the problem by jumping to fail: (instead of fail_drop:)
    which declares filesystem error and does not call unlock_new_inode().

    Signed-off-by: Jan Kara <jack@suse.cz>
    Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/ext4/ialloc.c | 8 ++++++--
    1 file changed, 6 insertions(+), 2 deletions(-)

    --- a/fs/ext4/ialloc.c
    +++ b/fs/ext4/ialloc.c
    @@ -1021,8 +1021,12 @@ got:
    if (IS_DIRSYNC(inode))
    ext4_handle_sync(handle);
    if (insert_inode_locked(inode) < 0) {
    - err = -EINVAL;
    - goto fail_drop;
    + /*
    + * Likely a bitmap corruption causing inode to be allocated
    + * twice.
    + */
    + err = -EIO;
    + goto fail;
    }
    spin_lock(&sbi->s_next_gen_lock);
    inode->i_generation = sbi->s_next_generation++;



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