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    Subject[patch 58/60] ext4: Use a fake block number for delayed new buffer_head

    -stable review patch. If anyone has any objections, please let us know.

    ------------------
    From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

    (cherry picked from commit 33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0)

    Use a very large unsigned number (~0xffff) as as the fake block number
    for the delayed new buffer. The VFS should never try to write out this
    number, but if it does, this will make it obvious.

    Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    fs/ext4/inode.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    --- a/fs/ext4/inode.c
    +++ b/fs/ext4/inode.c
    @@ -2105,6 +2105,10 @@ static int ext4_da_get_block_prep(struct
    struct buffer_head *bh_result, int create)
    {
    int ret = 0;
    + sector_t invalid_block = ~((sector_t) 0xffff);
    +
    + if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es))
    + invalid_block = ~0;

    BUG_ON(create == 0);
    BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize);
    @@ -2126,7 +2130,7 @@ static int ext4_da_get_block_prep(struct
    /* not enough space to reserve */
    return ret;

    - map_bh(bh_result, inode->i_sb, 0);
    + map_bh(bh_result, inode->i_sb, invalid_block);
    set_buffer_new(bh_result);
    set_buffer_delay(bh_result);
    } else if (ret > 0) {



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