6.1-stable review patch. If anyone has any objections, please let me know.
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From: Chao Yu chao@kernel.org
[ Upstream commit a4d7f2b3238fd5f76b9e6434a0bd5d2e29049cff ]
Soft IRQ Thread - f2fs_write_end_io - f2fs_defragment_range - set_page_private_gcing - type = WB_DATA_TYPE(page, false); : assign type w/ F2FS_WB_CP_DATA due to page_private_gcing() is true - dec_page_count() w/ wrong type - end_page_writeback()
Value of F2FS_WB_CP_DATA reference count may become negative under above race condition, the root cause is we missed to wait page writeback before setting gcing page private flag, let's fix it.
Fixes: 2d1fe8a86bf5 ("f2fs: fix to tag gcing flag on page during file defragment") Fixes: 4961acdd65c9 ("f2fs: fix to tag gcing flag on page during block migration") Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/file.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index f03320c47c823..c9f0bb8f8b210 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -2749,6 +2749,8 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi, goto clear_out; }
+ f2fs_wait_on_page_writeback(page, DATA, true, true); + set_page_dirty(page); set_page_private_gcing(page); f2fs_put_page(page, 1); @@ -4108,6 +4110,8 @@ static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len) /* It will never fail, when page has pinned above */ f2fs_bug_on(F2FS_I_SB(inode), !page);
+ f2fs_wait_on_page_writeback(page, DATA, true, true); + set_page_dirty(page); set_page_private_gcing(page); f2fs_put_page(page, 1);