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| author | Chao Yu <yuchao0@huawei.com> | 2019-03-06 17:30:59 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-03-12 18:59:19 -0700 |
| commit | 240a59156d9bcfabceddb66be449e7b32fb5dc4a (patch) | |
| tree | 83fdc1204a92dccad9b2dd895c56e75f2a8970ca /fs/binfmt_elf.c | |
| parent | 25720cc05e492467099a2d4d21a50f6ee8555cfd (diff) | |
| download | lwn-240a59156d9bcfabceddb66be449e7b32fb5dc4a.tar.gz lwn-240a59156d9bcfabceddb66be449e7b32fb5dc4a.zip | |
f2fs: fix to add refcount once page is tagged PG_private
As Gao Xiang reported in bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=202749
f2fs may skip pageout() due to incorrect page reference count.
The problem here is that MM defined the rule [1] very clearly that
once page was set with PG_private flag, we should increment the
refcount in that page, also main flows like pageout(), migrate_page()
will assume there is one additional page reference count if
page_has_private() returns true.
But currently, f2fs won't add/del refcount when changing PG_private
flag. Anyway, f2fs should follow MM's rule to make MM's related flows
running as expected.
[1] https://lore.kernel.org/lkml/2b19b3c4-2bc4-15fa-15cc-27a13e5c7af1@aol.com/
Reported-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/binfmt_elf.c')
0 files changed, 0 insertions, 0 deletions