diff options
| author | Hugh Dickins | 2012-05-30 00:06:43 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2012-05-30 01:22:23 +0200 |
| commit | 4fb5ef089b288942c6fc3f85c4ecb4016c1aa4c3 (patch) | |
| tree | aff66acd4b8a0e8cc060f5bf20ad3d6d75bdb7ab /mm/readahead.c | |
| parent | tmpfs: quit when fallocate fills memory (diff) | |
| download | kernel-qcow2-linux-4fb5ef089b288942c6fc3f85c4ecb4016c1aa4c3.tar.gz kernel-qcow2-linux-4fb5ef089b288942c6fc3f85c4ecb4016c1aa4c3.tar.xz kernel-qcow2-linux-4fb5ef089b288942c6fc3f85c4ecb4016c1aa4c3.zip | |
tmpfs: support SEEK_DATA and SEEK_HOLE
It's quite easy for tmpfs to scan the radix_tree to support llseek's new
SEEK_DATA and SEEK_HOLE options: so add them while the minutiae are still
on my mind (in particular, the !PageUptodate-ness of pages fallocated but
still unwritten).
But I don't know who actually uses SEEK_DATA or SEEK_HOLE, and whether it
would be of any use to them on tmpfs. This code adds 92 lines and 752
bytes on x86_64 - is that bloat or worthwhile?
[akpm@linux-foundation.org: fix warning with CONFIG_TMPFS=n]
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Josef Bacik <josef@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andreas Dilger <adilger@dilger.ca>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Marco Stornelli <marco.stornelli@gmail.com>
Cc: Jeff liu <jeff.liu@oracle.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/readahead.c')
0 files changed, 0 insertions, 0 deletions