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authorChao Yu <yuchao0@huawei.com>2019-03-06 10:30:59 +0100
committerJaegeuk Kim <jaegeuk@kernel.org>2019-03-13 02:59:19 +0100
commit240a59156d9bcfabceddb66be449e7b32fb5dc4a (patch)
tree83fdc1204a92dccad9b2dd895c56e75f2a8970ca /fs/f2fs/segment.c
parentf2fs: remove wrong comment in f2fs_invalidate_page() (diff)
downloadlinux-240a59156d9bcfabceddb66be449e7b32fb5dc4a.tar.xz
linux-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 '')
-rw-r--r--fs/f2fs/segment.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e730c334abba..aa7fe79b62b2 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -191,8 +191,7 @@ void f2fs_register_inmem_page(struct inode *inode, struct page *page)
f2fs_trace_pid(page);
- set_page_private(page, (unsigned long)ATOMIC_WRITTEN_PAGE);
- SetPagePrivate(page);
+ f2fs_set_page_private(page, (unsigned long)ATOMIC_WRITTEN_PAGE);
new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);
@@ -280,8 +279,7 @@ next:
ClearPageUptodate(page);
clear_cold_data(page);
}
- set_page_private(page, 0);
- ClearPagePrivate(page);
+ f2fs_clear_page_private(page);
f2fs_put_page(page, 1);
list_del(&cur->list);
@@ -370,8 +368,7 @@ void f2fs_drop_inmem_page(struct inode *inode, struct page *page)
kmem_cache_free(inmem_entry_slab, cur);
ClearPageUptodate(page);
- set_page_private(page, 0);
- ClearPagePrivate(page);
+ f2fs_clear_page_private(page);
f2fs_put_page(page, 0);
trace_f2fs_commit_inmem_page(page, INMEM_INVALIDATE);