• Dave Chinner's avatar
    superblock: move pin_sb_for_writeback() to fs/super.c · 12ad3ab6
    Dave Chinner authored
    The per-sb shrinker has the same requirement as the writeback
    threads of ensuring that the superblock is usable and pinned for the
    time it takes to run the work. Both need to take a passive reference
    to the sb, take a read lock on the s_umount lock and then only
    continue if an unmount is not in progress.
    
    pin_sb_for_writeback() does this exactly, so move it to fs/super.c
    and rename it to grab_super_passive() and exporting it via
    fs/internal.h for all the VFS code to be able to use.
    Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
    12ad3ab6
fs-writeback.c 34.8 KB