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author | NeilBrown <neilb@suse.de> | 2022-05-10 04:20:48 +0300 |
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committer | akpm <akpm@linux-foundation.org> | 2022-05-10 04:20:48 +0300 |
commit | 4b60c0ff2f2021ab99b7fb9da63b7ed1579ef1d8 (patch) | |
tree | 4fc4ec8223b77390776cca9ef63ba3f9e97f988b /mm/page_owner.c | |
parent | 4c4a763406ef903b78334bd2ccea168d2f7a741a (diff) | |
download | linux-4b60c0ff2f2021ab99b7fb9da63b7ed1579ef1d8.tar.xz |
mm: move responsibility for setting SWP_FS_OPS to ->swap_activate
If a filesystem wishes to handle all swap IO itself (via ->direct_IO and
->readpage), rather than just providing devices addresses for
submit_bio(), SWP_FS_OPS must be set.
Currently the protocol for setting this it to have ->swap_activate return
zero. In that case SWP_FS_OPS is set, and add_swap_extent() is called for
the entire file.
This is a little clumsy as different return values for ->swap_activate
have quite different meanings, and it makes it hard to search for which
filesystems require SWP_FS_OPS to be set.
So remove the special meaning of a zero return, and require the filesystem
to set SWP_FS_OPS if it so desires, and to always call add_swap_extent()
as required.
Currently only NFS and CIFS return zero for add_swap_extent().
Link: https://lkml.kernel.org/r/164859778123.29473.17908205846599043598.stgit@noble.brown
Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: David Howells <dhowells@redhat.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page_owner.c')
0 files changed, 0 insertions, 0 deletions