• Takashi Sato's avatar
    filesystem freeze: implement generic freeze feature · fcccf502
    Takashi Sato authored
    The ioctls for the generic freeze feature are below.
    o Freeze the filesystem
      int ioctl(int fd, int FIFREEZE, arg)
        fd: The file descriptor of the mountpoint
        FIFREEZE: request code for the freeze
        arg: Ignored
        Return value: 0 if the operation succeeds. Otherwise, -1
    
    o Unfreeze the filesystem
      int ioctl(int fd, int FITHAW, arg)
        fd: The file descriptor of the mountpoint
        FITHAW: request code for unfreeze
        arg: Ignored
        Return value: 0 if the operation succeeds. Otherwise, -1
        Error number: If the filesystem has already been unfrozen,
                      errno is set to EINVAL.
    
    [akpm@linux-foundation.org: fix CONFIG_BLOCK=n]
    Signed-off-by: default avatarTakashi Sato <t-sato@yk.jp.nec.com>
    Signed-off-by: default avatarMasayuki Hamaguchi <m-hamaguchi@ys.jp.nec.com>
    Cc: <xfs-masters@oss.sgi.com>
    Cc: <linux-ext4@vger.kernel.org>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Dave Kleikamp <shaggy@austin.ibm.com>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Alasdair G Kergon <agk@redhat.com>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    fcccf502
buffer_head.h 11.6 KB