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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-06-18 23:52:23 +0900
committerGreg Kroah-Hartman <gregkh@suse.de>2009-07-30 14:39:48 -0700
commitdef5dcb823a26bab8f1dc6b21b904c7de8e37bca (patch)
treea1514d48538d9648272da9e513109460705bcaed
parentf76cea526e01055bedb51a2b318f4d711e0144c4 (diff)
downloadlinux-linaro-stable-def5dcb823a26bab8f1dc6b21b904c7de8e37bca.tar.gz
nilfs2: fix hang problem of log writer which occurs after write failures
commit 8227b29722fdbac72357aae155d171a5c777670c upstream. Leandro Lucarella gave me a report that nilfs gets stuck after its write function fails. The problem turned out to be caused by bugs which leave writeback flag on pages. This fixes the problem by ensuring to clear the writeback flag in error path. Reported-by: Leandro Lucarella <llucax@gmail.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/nilfs2/segment.c26
1 files changed, 6 insertions, 20 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 16b6c47755ff..1779ddcace0b 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1853,19 +1853,6 @@ static int nilfs_segctor_write(struct nilfs_sc_info *sci,
return 0;
}
-static int nilfs_page_has_uncleared_buffer(struct page *page)
-{
- struct buffer_head *head, *bh;
-
- head = bh = page_buffers(page);
- do {
- if (buffer_dirty(bh) && !list_empty(&bh->b_assoc_buffers))
- return 1;
- bh = bh->b_this_page;
- } while (bh != head);
- return 0;
-}
-
static void __nilfs_end_page_io(struct page *page, int err)
{
if (!err) {
@@ -1889,12 +1876,11 @@ static void nilfs_end_page_io(struct page *page, int err)
if (!page)
return;
- if (buffer_nilfs_node(page_buffers(page)) &&
- nilfs_page_has_uncleared_buffer(page))
- /* For b-tree node pages, this function may be called twice
- or more because they might be split in a segment.
- This check assures that cleanup has been done for all
- buffers in a split btnode page. */
+ if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page))
+ /*
+ * For b-tree node pages, this function may be called twice
+ * or more because they might be split in a segment.
+ */
return;
__nilfs_end_page_io(page, err);
@@ -1957,7 +1943,7 @@ static void nilfs_segctor_abort_write(struct nilfs_sc_info *sci,
}
if (bh->b_page != fs_page) {
nilfs_end_page_io(fs_page, err);
- if (unlikely(fs_page == failed_page))
+ if (fs_page && fs_page == failed_page)
goto done;
fs_page = bh->b_page;
}