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    Subject[ 074/109] ext4: fix hole punch failure when depth is greater than 0
    Date
    From: Greg KH <gregkh@linuxfoundation.org>

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

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

    From: Ashish Sangwan <ashishsangwan2@gmail.com>

    commit 968dee77220768a5f52cf8b21d0bdb73486febef upstream.

    Whether to continue removing extents or not is decided by the return
    value of function ext4_ext_more_to_rm() which checks 2 conditions:
    a) if there are no more indexes to process.
    b) if the number of entries are decreased in the header of "depth -1".

    In case of hole punch, if the last block to be removed is not part of
    the last extent index than this index will not be deleted, hence the
    number of valid entries in the extent header of "depth - 1" will
    remain as it is and ext4_ext_more_to_rm will return 0 although the
    required blocks are not yet removed.

    This patch fixes the above mentioned problem as instead of removing
    the extents from the end of file, it starts removing the blocks from
    the particular extent from which removing blocks is actually required
    and continue backward until done.

    Signed-off-by: Ashish Sangwan <ashish.sangwan2@gmail.com>
    Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
    Reviewed-by: Lukas Czerner <lczerner@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/ext4/extents.c | 48 ++++++++++++++++++++++++++++++------------------
    1 file changed, 30 insertions(+), 18 deletions(-)

    --- a/fs/ext4/extents.c
    +++ b/fs/ext4/extents.c
    @@ -2503,10 +2503,10 @@ static int ext4_ext_remove_space(struct
    {
    struct super_block *sb = inode->i_sb;
    int depth = ext_depth(inode);
    - struct ext4_ext_path *path;
    + struct ext4_ext_path *path = NULL;
    ext4_fsblk_t partial_cluster = 0;
    handle_t *handle;
    - int i, err;
    + int i = 0, err;

    ext_debug("truncate since %u to %u\n", start, end);

    @@ -2539,8 +2539,12 @@ again:
    }
    depth = ext_depth(inode);
    ex = path[depth].p_ext;
    - if (!ex)
    + if (!ex) {
    + ext4_ext_drop_refs(path);
    + kfree(path);
    + path = NULL;
    goto cont;
    + }

    ee_block = le32_to_cpu(ex->ee_block);

    @@ -2570,8 +2574,6 @@ again:
    if (err < 0)
    goto out;
    }
    - ext4_ext_drop_refs(path);
    - kfree(path);
    }
    cont:

    @@ -2580,19 +2582,27 @@ cont:
    * after i_size and walking into the tree depth-wise.
    */
    depth = ext_depth(inode);
    - path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), GFP_NOFS);
    - if (path == NULL) {
    - ext4_journal_stop(handle);
    - return -ENOMEM;
    - }
    - path[0].p_depth = depth;
    - path[0].p_hdr = ext_inode_hdr(inode);
    -
    - if (ext4_ext_check(inode, path[0].p_hdr, depth)) {
    - err = -EIO;
    - goto out;
    + if (path) {
    + int k = i = depth;
    + while (--k > 0)
    + path[k].p_block =
    + le16_to_cpu(path[k].p_hdr->eh_entries)+1;
    + } else {
    + path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
    + GFP_NOFS);
    + if (path == NULL) {
    + ext4_journal_stop(handle);
    + return -ENOMEM;
    + }
    + path[0].p_depth = depth;
    + path[0].p_hdr = ext_inode_hdr(inode);
    +
    + if (ext4_ext_check(inode, path[0].p_hdr, depth)) {
    + err = -EIO;
    + goto out;
    + }
    }
    - i = err = 0;
    + err = 0;

    while (i >= 0 && err == 0) {
    if (i == depth) {
    @@ -2706,8 +2716,10 @@ cont:
    out:
    ext4_ext_drop_refs(path);
    kfree(path);
    - if (err == -EAGAIN)
    + if (err == -EAGAIN) {
    + path = NULL;
    goto again;
    + }
    ext4_journal_stop(handle);

    return err;



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