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staging: lustre: llite: avoid a deadlock in page write

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For a partial page write, it will have to issue a READ RPC firstly
to get a full uptodate page. If another page is already locked by
this thread it can easily cause deadlock.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4873
Reviewed-on: http://review.whamcloud.com/9928
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jinshan Xiong 2016-08-16 16:18:44 -04:00 committed by Greg Kroah-Hartman
parent 9b58714f9a
commit 91196c20a3
1 changed files with 3 additions and 2 deletions
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5
drivers/staging/lustre/lustre/llite/rw26.c
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@ -506,8 +506,9 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
env = lcc->lcc_env;
io = lcc->lcc_io;
/* To avoid deadlock, try to lock page first. */
vmpage = grab_cache_page_nowait(mapping, index);
if (likely(to == PAGE_SIZE)) /* LU-4873 */
/* To avoid deadlock, try to lock page first. */
vmpage = grab_cache_page_nowait(mapping, index);
if (unlikely(!vmpage || PageDirty(vmpage) || PageWriteback(vmpage))) {
struct vvp_io *vio = vvp_env_io(env);
struct cl_page_list *plist = &vio->u.write.vui_queue;