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btrfs: defrag: also check PagePrivate for subpage cases in cluster_pages_for_defrag()

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In function cluster_pages_for_defrag() we have a window where we unlock
page, either start the ordered range or read the content from disk.

When we re-lock the page, we need to make sure it still has the correct
page->private for subpage.

Thus add the extra PagePrivate check here to handle subpage cases
properly.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
2021-08-06 16:12:33 +08:00
committed by David Sterba
parent 1ccc2e8a86
commit cae7968680
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/ioctl.c
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@@ -1278,7 +1278,8 @@ static int cluster_pages_for_defrag(struct inode *inode,
* we unlocked the page above, so we need check if
* it was released or not.
*/
if (page->mapping != inode->i_mapping) {
if (page->mapping != inode->i_mapping ||
!PagePrivate(page)) {
unlock_page(page);
put_page(page);
goto again;
@@ -1296,7 +1297,7 @@ static int cluster_pages_for_defrag(struct inode *inode,
}
}
if (page->mapping != inode->i_mapping) {
if (page->mapping != inode->i_mapping || !PagePrivate(page)) {
unlock_page(page);
put_page(page);
goto again;