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authorHugh Dickins <hughd@google.com>2012-05-29 15:06:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 16:22:22 -0700
commit83e4fa9c16e4af7122e31be3eca5d57881d236fe (patch)
tree594bc4152a58314a3f5068aefaa28783d1f2021a /mm/madvise.c
parentec9516fbc5fa814014991e1ae7f8860127122105 (diff)
tmpfs: support fallocate FALLOC_FL_PUNCH_HOLE
tmpfs has supported hole-punching since 2.6.16, via madvise(,,MADV_REMOVE). But nowadays fallocate(,FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE,,) is the agreed way to punch holes. So add shmem_fallocate() to support that, and tweak shmem_truncate_range() to support partial pages at both the beginning and end of range (never needed for madvise, which demands rounded addr and rounds up length). Based-on-patch-by: Cong Wang <amwang@redhat.com> Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Cong Wang <amwang@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
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