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| author |   Piotr Sarna <p.sarna@tlen.pl> | 2019-11-30 17:56:43 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-01 12:59:08 -0800 |
| commit | 1ab5b82f540b31852fbf4a3c975f3c16e0e76b9f (patch) | |
| tree | 9f1583419c12a50e52437d00f10dd159854c821e /mm/hugetlb.c | |
| parent | hugetlbfs: convert macros to static inline, fix sparse warning (diff) | |
| download | linux-dev-1ab5b82f540b31852fbf4a3c975f3c16e0e76b9f.tar.xz linux-dev-1ab5b82f540b31852fbf4a3c975f3c16e0e76b9f.zip | |
hugetlbfs: add O_TMPFILE support
With hugetlbfs, a common pattern for mapping anonymous huge pages is to
create a temporary file first. Currently libraries like libhugetlbfs
and seastar create these with a standard mkstemp+unlink trick, but it
would be more robust to be able to simply pass the O_TMPFILE flag to
open(). O_TMPFILE is already supported by several file systems like
ext4 and xfs. The implementation simply uses the existi= ng d_tmpfile
utility function to instantiate the dcache entry for the file.
Tested manually by successfully creating a temporary file by opening it
with (O_TMPFILE|O_RDWR) on mounted hugetlbfs and successfully mapping 2M
huge pages with it. Without the patch, trying to open a file with
O_TMPFILE results in -ENOSUP.
Link: http://lkml.kernel.org/r/bc9383eff6e1374d79f3a92257ae829ba1e6ae60.1573285189.git.p.sarna@tlen.pl
Signed-off-by: Piotr Sarna <p.sarna@tlen.pl>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
0 files changed, 0 insertions, 0 deletions