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authorAndreas Gruenbacher <agruenba@redhat.com>2023-10-31 00:06:05 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-11-28 20:19:49 +0300
commitc921e1ee70a5f6837df07c830b8e9285916d3a9a (patch)
tree136c2e6a275ec3c5486bf162d3d1b9eabb6e932a /fs/gfs2
parentf9e1d36a66d539041f93065ae6851b9801305872 (diff)
downloadlinux-c921e1ee70a5f6837df07c830b8e9285916d3a9a.tar.xz
gfs2: Silence "suspicious RCU usage in gfs2_permission" warning
[ Upstream commit 074d7306a4fe22fcac0b53f699f92757ab1cee99 ] Commit 0abd1557e21c added rcu_dereference() for dereferencing ip->i_gl in gfs2_permission. This now causes lockdep to complain when gfs2_permission is called in non-RCU context: WARNING: suspicious RCU usage in gfs2_permission Switch to rcu_dereference_check() and check for the MAY_NOT_BLOCK flag to shut up lockdep when we know that dereferencing ip->i_gl is safe. Fixes: 0abd1557e21c ("gfs2: fix an oops in gfs2_permission") Reported-by: syzbot+3e5130844b0c0e2b4948@syzkaller.appspotmail.com Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/inode.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index eb4bbe1728c0..4e63fbb63151 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1866,6 +1866,7 @@ out:
int gfs2_permission(struct mnt_idmap *idmap, 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;
@@ -1873,14 +1874,14 @@ int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
gfs2_holder_mark_uninitialized(&i_gh);
ip = GFS2_I(inode);
- gl = rcu_dereference(ip->i_gl);
+ 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(!(mask & MAY_NOT_BLOCK));
+ WARN_ON_ONCE(!may_not_block);
return -ECHILD;
}
if (gfs2_glock_is_locked_by_me(gl) == NULL) {
- if (mask & MAY_NOT_BLOCK)
+ if (may_not_block)
return -ECHILD;
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
if (error)