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afs: Fix afs_kill_pages()

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[ Upstream commit 7286a35e89 ]

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@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Howells 2017-03-16 16:27:48 +00:00 committed by Greg Kroah-Hartman
parent 80f74cef48
commit 5e469e44c8
1 changed files with 7 additions and 3 deletions
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10
fs/afs/write.c
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@ -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);