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f2fs: get out of a repeat loop when getting a locked data page 

[ Upstream commit d2d9bb3b6d ]

https://bugzilla.kernel.org/show_bug.cgi?id=216050

Somehow we're getting a page which has a different mapping.
Let's avoid the infinite loop.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jaegeuk Kim 2023-01-19 10:47:00 -08:00 committed by Greg Kroah-Hartman
parent 8b3b859bf8
commit a84ac8995a
1 changed files with 2 additions and 6 deletions
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8
fs/f2fs/data.c
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@ -1329,18 +1329,14 @@ struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
{ {
struct address_space *mapping = inode->i_mapping; struct address_space *mapping = inode->i_mapping;
struct page *page; struct page *page;
repeat:
page = f2fs_get_read_data_page(inode, index, 0, for_write, NULL); page = f2fs_get_read_data_page(inode, index, 0, for_write, NULL);
if (IS_ERR(page)) if (IS_ERR(page))
return page; return page;
/* wait for read completion */ /* wait for read completion */
lock_page(page); lock_page(page);
if (unlikely(page->mapping != mapping)) { if (unlikely(page->mapping != mapping || !PageUptodate(page))) {
f2fs_put_page(page, 1);
goto repeat;
}
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1); f2fs_put_page(page, 1);
return ERR_PTR(-EIO); return ERR_PTR(-EIO);
} }