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    Subject[PATCH 3.10 110/129] ceph: allow sync_read/write return partial successed size of read/write.
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

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

    From: majianpeng <majianpeng@gmail.com>

    commit ee7289bfadda5f4ef60884547ebc9989c8fb314a upstream.

    For sync_read/write, it may do multi stripe operations.If one of those
    met erro, we return the former successed size rather than a error value.
    There is a exception for write-operation met -EOLDSNAPC.If this occur,we
    retry the whole write again.

    Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/ceph/file.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    --- a/fs/ceph/file.c
    +++ b/fs/ceph/file.c
    @@ -373,7 +373,7 @@ more:
    goto more;
    }

    - if (ret >= 0) {
    + if (read > 0) {
    ret = read;
    /* did we bounce off eof? */
    if (pos + left > inode->i_size)
    @@ -611,6 +611,8 @@ out:
    if (check_caps)
    ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
    NULL);
    + } else if (ret != -EOLDSNAPC && written > 0) {
    + ret = written;
    }
    return ret;
    }



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