diff options
| author | Pavel Shilovsky <pshilov@microsoft.com> | 2019-01-29 16:40:28 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 20:11:16 +0100 |
| commit | 75bbb83e80c764ddfb4a70270c5b269c92cebd66 (patch) | |
| tree | cd293e54e23caa8ba062978dff2573787b6a1a8e | |
| parent | afaf9d664b0f2e94110947db89123be1fcc1f5e9 (diff) | |
| download | talos-obmc-linux-75bbb83e80c764ddfb4a70270c5b269c92cebd66.tar.gz talos-obmc-linux-75bbb83e80c764ddfb4a70270c5b269c92cebd66.zip | |
CIFS: Fix leaking locked VFS cache pages in writeback retry
commit 165df9a080b6863ae286fa01780c13d87cd81076 upstream.
If we don't find a writable file handle when retrying writepages
we break of the loop and do not unlock and put pages neither from
wdata2 nor from the original wdata. Fix this by walking through
all the remaining pages and cleanup them properly.
Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/cifs/cifssmb.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index bb54ccf8481c..551924beb86f 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -2125,12 +2125,13 @@ cifs_writev_requeue(struct cifs_writedata *wdata) wdata2->cfile = find_writable_file(CIFS_I(inode), false); if (!wdata2->cfile) { - cifs_dbg(VFS, "No writable handles for inode\n"); + cifs_dbg(VFS, "No writable handle to retry writepages\n"); rc = -EBADF; - break; + } else { + wdata2->pid = wdata2->cfile->pid; + rc = server->ops->async_writev(wdata2, + cifs_writedata_release); } - wdata2->pid = wdata2->cfile->pid; - rc = server->ops->async_writev(wdata2, cifs_writedata_release); for (j = 0; j < nr_pages; j++) { unlock_page(wdata2->pages[j]); @@ -2145,6 +2146,7 @@ cifs_writev_requeue(struct cifs_writedata *wdata) kref_put(&wdata2->refcount, cifs_writedata_release); if (is_retryable_error(rc)) continue; + i += nr_pages; break; } @@ -2152,6 +2154,13 @@ cifs_writev_requeue(struct cifs_writedata *wdata) i += nr_pages; } while (i < wdata->nr_pages); + /* cleanup remaining pages from the original wdata */ + for (; i < wdata->nr_pages; i++) { + SetPageError(wdata->pages[i]); + end_page_writeback(wdata->pages[i]); + put_page(wdata->pages[i]); + } + if (rc != 0 && !is_retryable_error(rc)) mapping_set_error(inode->i_mapping, rc); kref_put(&wdata->refcount, cifs_writedata_release); |
