diff options
| author |   Yan, Zheng <zyan@redhat.com> | 2016-05-13 17:29:51 +0800 |
|---|---|---|
| committer |   Ilya Dryomov <idryomov@gmail.com> | 2016-05-26 01:15:41 +0200 |
| commit | ad15ec06e51b6eb73981428109e32c75cbad7d3d (patch) | |
| tree | 9bd43988e2b973ac091648a3fdd422d399aaa896 /fs | |
| parent | ceph: make ceph_update_writeable_page() uninterruptible (diff) | |
| download | wireguard-linux-ad15ec06e51b6eb73981428109e32c75cbad7d3d.tar.xz wireguard-linux-ad15ec06e51b6eb73981428109e32c75cbad7d3d.zip | |
ceph: handle interrupted ceph_writepage()
writepage() can be interrupted when it's called by direct memory
reclaimer (the direct memory relaimer is killed). To avoid lossing
data, we redirty the page.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ceph/addr.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 4aa8e375e648..080a9cab3ee1 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -544,11 +544,21 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) truncate_seq, truncate_size, &inode->i_mtime, &page, 1); if (err < 0) { - dout("writepage setting page/mapping error %d %p\n", err, page); + struct writeback_control tmp_wbc; + if (!wbc) + wbc = &tmp_wbc; + if (err == -ERESTARTSYS) { + /* killed by SIGKILL */ + dout("writepage interrupted page %p\n", page); + redirty_page_for_writepage(wbc, page); + end_page_writeback(page); + goto out; + } + dout("writepage setting page/mapping error %d %p\n", + err, page); SetPageError(page); mapping_set_error(&inode->i_data, err); - if (wbc) - wbc->pages_skipped++; + wbc->pages_skipped++; } else { dout("writepage cleaned page %p\n", page); err = 0; /* vfs expects us to return 0 */ @@ -569,12 +579,16 @@ static int ceph_writepage(struct page *page, struct writeback_control *wbc) BUG_ON(!inode); ihold(inode); err = writepage_nounlock(page, wbc); + if (err == -ERESTARTSYS) { + /* direct memory reclaimer was killed by SIGKILL. return 0 + * to prevent caller from setting mapping/page error */ + err = 0; + } unlock_page(page); iput(inode); return err; } - /* * lame release_pages helper. release_pages() isn't exported to * modules. |