From ae5ef67b9a71dba0dc4b045cca102c4ab3c0bd5f Mon Sep 17 00:00:00 2001 From: Sebastien Buisson Date: Thu, 25 Jul 2013 01:17:27 +0800 Subject: [PATCH] staging/lustre/llite: fix 'data race condition' issues of lli_flags Fix 'data race condition' defects found by Coverity version 6.5.0: Data race condition (MISSING_LOCK) Accessing variable without holding lock. Elsewhere, this variable is accessed with lock held. lli->lli_flags need to be protected by lli->lli_lock. Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2744 Lustre-change: http://review.whamcloud.com/6571 Signed-off-by: Sebastien Buisson Reviewed-by: Fan Yong Reviewed-by: Keith Mannthey Reviewed-by: Oleg Drokin Signed-off-by: Peng Tao Signed-off-by: Andreas Dilger Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lustre/llite/llite_lib.c | 4 ++++ drivers/staging/lustre/lustre/llite/namei.c | 5 ++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c index 890268834510..b44a3d6d0edd 100644 --- a/drivers/staging/lustre/lustre/llite/llite_lib.c +++ b/drivers/staging/lustre/lustre/llite/llite_lib.c @@ -1189,7 +1189,9 @@ void ll_clear_inode(struct inode *inode) LASSERT(lli->lli_opendir_pid == 0); } + spin_lock(&lli->lli_lock); ll_i2info(inode)->lli_flags &= ~LLIF_MDS_SIZE_LOCK; + spin_unlock(&lli->lli_lock); md_null_inode(sbi->ll_md_exp, ll_inode2fid(inode)); LASSERT(!lli->lli_open_fd_write_count); @@ -1756,7 +1758,9 @@ void ll_update_inode(struct inode *inode, struct lustre_md *md) /* Use old size assignment to avoid * deadlock bz14138 & bz14326 */ i_size_write(inode, body->size); + spin_lock(&lli->lli_lock); lli->lli_flags |= LLIF_MDS_SIZE_LOCK; + spin_unlock(&lli->lli_lock); } ldlm_lock_decref(&lockh, mode); } diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c index 8e948a71dd64..333e55f692f1 100644 --- a/drivers/staging/lustre/lustre/llite/namei.c +++ b/drivers/staging/lustre/lustre/llite/namei.c @@ -275,8 +275,11 @@ int ll_md_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc, CDEBUG(D_INODE, "invaliding layout %d.\n", rc); } - if (bits & MDS_INODELOCK_UPDATE) + if (bits & MDS_INODELOCK_UPDATE) { + spin_lock(&lli->lli_lock); lli->lli_flags &= ~LLIF_MDS_SIZE_LOCK; + spin_unlock(&lli->lli_lock); + } if (S_ISDIR(inode->i_mode) && (bits & MDS_INODELOCK_UPDATE)) { -- 2.20.1