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nilfs2: fix hang problem of log writer which occurs after write failures

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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>
Cc: stable@kernel.org
This commit is contained in:
Ryusuke Konishi 2009-06-18 23:52:23 +09:00
parent 0cfae3d879
commit 8227b29722
1 changed files with 6 additions and 20 deletions
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26
fs/nilfs2/segment.c
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@ -1836,19 +1836,6 @@ 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) {
@ -1872,12 +1859,11 @@ 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);
@ -1940,7 +1926,7 @@ 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;
}