From d6abc59ec8440cf3677a54d6fb12afbd20f70821 Mon Sep 17 00:00:00 2001 From: Lai Siyao Date: Wed, 25 Mar 2015 21:53:26 -0400 Subject: [PATCH] staging/lustre/xattr: xattr data may be gone with lock held Xattr cached data may be gone, but lock still held, in this case, refetch xattr from server, otherwise client will return error. Signed-off-by: Lai Siyao Reviewed-on: http://review.whamcloud.com/12952 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3544 Reviewed-by: Bobi Jam Reviewed-by: Nathaniel Clark Signed-off-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lustre/llite/xattr_cache.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/staging/lustre/lustre/llite/xattr_cache.c b/drivers/staging/lustre/lustre/llite/xattr_cache.c index da190f9..69ea92a 100644 --- a/drivers/staging/lustre/lustre/llite/xattr_cache.c +++ b/drivers/staging/lustre/lustre/llite/xattr_cache.c @@ -295,13 +295,18 @@ static int ll_xattr_find_get_lock(struct inode *inode, mutex_lock(&lli->lli_xattrs_enq_lock); - /* Try matching first. */ - mode = ll_take_md_lock(inode, MDS_INODELOCK_XATTR, &lockh, 0, LCK_PR); - if (mode != 0) { - /* fake oit in mdc_revalidate_lock() manner */ - oit->d.lustre.it_lock_handle = lockh.cookie; - oit->d.lustre.it_lock_mode = mode; - goto out; + /* inode may have been shrunk and recreated, so data is gone, match lock + * only when data exists. */ + if (ll_xattr_cache_valid(lli)) { + /* Try matching first. */ + mode = ll_take_md_lock(inode, MDS_INODELOCK_XATTR, &lockh, 0, + LCK_PR); + if (mode != 0) { + /* fake oit in mdc_revalidate_lock() manner */ + oit->d.lustre.it_lock_handle = lockh.cookie; + oit->d.lustre.it_lock_mode = mode; + goto out; + } } /* Enqueue if the lock isn't cached locally. */ -- 2.7.4