diff options
Diffstat (limited to 'fs/gfs2/inode.c')
| -rw-r--r-- | fs/gfs2/inode.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 97ee17843b4d..462e957eda8b 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -1848,16 +1848,24 @@ out: int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode, int mask) { + int may_not_block = mask & MAY_NOT_BLOCK; struct gfs2_inode *ip; struct gfs2_holder i_gh; + struct gfs2_glock *gl; int error; gfs2_holder_mark_uninitialized(&i_gh); ip = GFS2_I(inode); - if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { - if (mask & MAY_NOT_BLOCK) + gl = rcu_dereference_check(ip->i_gl, !may_not_block); + if (unlikely(!gl)) { + /* inode is getting torn down, must be RCU mode */ + WARN_ON_ONCE(!may_not_block); + return -ECHILD; + } + if (gfs2_glock_is_locked_by_me(gl) == NULL) { + if (may_not_block) return -ECHILD; - error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); + error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); if (error) return error; } |