mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-06 03:06:50 -04:00
Code Issues Packages Projects Releases Wiki Activity

staging/lustre/llite: deadlock for page write

Browse Source 
Writing thread already locked page #1, and then wait for the
Writeback bit of page #2;

Ptlrpc thread is composing a write RPC, so it sets Writeback on
page #2 and tries to lock page #1 to make it ready.

Deadlocked.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-on: http://review.whamcloud.com/9036
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4540
Reviewed-by: wangdi <di.wang@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jinshan Xiong
2016-03-30 19:48:43 -04:00
committed by Greg Kroah-Hartman
parent c11599b8d5
commit d37dd10b71
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/staging/lustre/lustre/llite/rw26.c
View File

@@ -512,7 +512,7 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
/* To avoid deadlock, try to lock page first. */
vmpage = grab_cache_page_nowait(mapping, index);
if (unlikely(!vmpage || PageDirty(vmpage))) {
if (unlikely(!vmpage || PageDirty(vmpage) || PageWriteback(vmpage))) {
struct ccc_io *cio = ccc_env_io(env);
struct cl_page_list *plist = &cio->u.write.cui_queue;
@@ -522,7 +522,7 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
* more grants. It's okay for the dirty page to be the first
* one in commit page list, though.
*/
if (vmpage && PageDirty(vmpage) && plist->pl_nr > 0) {
if (vmpage && plist->pl_nr > 0) {
unlock_page(vmpage);
page_cache_release(vmpage);
vmpage = NULL;