• Theodore Ts'o's avatar
    ext4: add ext4_sb_bread() to disambiguate ENOMEM cases · 9da1f6d0
    Theodore Ts'o authored
    commit fb265c9c upstream.
    
    Today, when sb_bread() returns NULL, this can either be because of an
    I/O error or because the system failed to allocate the buffer.  Since
    it's an old interface, changing would require changing many call
    sites.
    
    So instead we create our own ext4_sb_bread(), which also allows us to
    set the REQ_META flag.
    
    Also fixed a problem in the xattr code where a NULL return in a
    function could also mean that the xattr was not found, which could
    lead to the wrong error getting returned to userspace.
    
    Fixes: ac27a0ec ("ext4: initial copy of files from ext3")
    Cc: stable@kernel.org # 2.6.19
    Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    9da1f6d0
migrate.c 17.2 KB