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    mm/fs: route MADV_REMOVE to FALLOC_FL_PUNCH_HOLE · 3f31d075
    Hugh Dickins 提交于
    Now tmpfs supports hole-punching via fallocate(), switch madvise_remove()
    to use do_fallocate() instead of vmtruncate_range(): which extends
    madvise(,,MADV_REMOVE) support from tmpfs to ext4, ocfs2 and xfs.
    
    There is one more user of vmtruncate_range() in our tree,
    staging/android's ashmem_shrink(): convert it to use do_fallocate() too
    (but if its unpinned areas are already unmapped - I don't know - then it
    would do better to use shmem_truncate_range() directly).
    Based-on-patch-by: NCong Wang <amwang@redhat.com>
    Signed-off-by: NHugh Dickins <hughd@google.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Colin Cross <ccross@android.com>
    Cc: John Stultz <john.stultz@linaro.org>
    Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
    Cc: "Theodore Ts'o" <tytso@mit.edu>
    Cc: Andreas Dilger <adilger@dilger.ca>
    Cc: Mark Fasheh <mfasheh@suse.de>
    Cc: Joel Becker <jlbec@evilplan.org>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Ben Myers <bpm@sgi.com>
    Cc: Michael Kerrisk <mtk.manpages@gmail.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    3f31d075
madvise.c 11.6 KB