From: David Howells dhowells@redhat.com
This patch has been added to the stable tree. If you have any objections, please let us know.
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[ Upstream commit 7286a35e893176169b09715096a4aca557e2ccd2 ]
Fix afs_kill_pages() in two ways:
(1) If a writeback has been partially flushed, then if we try and kill the pages it contains, some of them may no longer be undergoing writeback and end_page_writeback() will assert.
Fix this by checking to see whether the page in question is actually undergoing writeback before ending that writeback.
(2) The loop that scans for pages to kill doesn't increase the first page index, and so the loop may not terminate, but it will try to process the same pages over and over again.
Fix this by increasing the first page index to one after the last page we processed.
Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- fs/afs/write.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/fs/afs/write.c b/fs/afs/write.c index d89595155ec9..5cfc05ca184c 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -299,10 +299,14 @@ static void afs_kill_pages(struct afs_vnode *vnode, bool error, ASSERTCMP(pv.nr, ==, count);
for (loop = 0; loop < count; loop++) { - ClearPageUptodate(pv.pages[loop]); + struct page *page = pv.pages[loop]; + ClearPageUptodate(page); if (error) - SetPageError(pv.pages[loop]); - end_page_writeback(pv.pages[loop]); + SetPageError(page); + if (PageWriteback(page)) + end_page_writeback(page); + if (page->index >= first) + first = page->index + 1; }
__pagevec_release(&pv);