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| author |   Bob Peterson <rpeterso@redhat.com> | 2021-09-29 14:42:38 -0500 |
|---|---|---|
| committer |   Andreas Gruenbacher <agruenba@redhat.com> | 2021-10-25 08:42:18 +0200 |
| commit | 763766c0571ea14e9790242201b7199b395b8bf5 (patch) | |
| tree | 7017ace19fd27b509eef5e9700059dabb79a5f4b /fs/gfs2/inode.c | |
| parent | gfs2: Save ip from gfs2_glock_nq_init (diff) | |
| download | linux-dev-763766c0571ea14e9790242201b7199b395b8bf5.tar.xz linux-dev-763766c0571ea14e9790242201b7199b395b8bf5.zip | |
gfs2: dequeue iopen holder in gfs2_inode_lookup error
Before this patch, if function gfs2_inode_lookup encountered an error
after it had locked the iopen glock, it never unlocked it, relying on
the evict code to do the cleanup. The evict code then took the
inode glock while holding the iopen glock, which violates the locking
order. For example,
(1) node A does a gfs2_inode_lookup that fails, leaving the iopen glock
locked.
(2) node B calls delete_work_func -> gfs2_lookup_by_inum ->
gfs2_inode_lookup. It locks the inode glock and blocks trying to
lock the iopen glock, which is held by node A.
(3) node A eventually calls gfs2_evict_inode -> evict_should_delete.
It blocks trying to lock the inode glock, which is now held by
node B.
This patch introduces error handling to function gfs2_inode_lookup
so it properly dequeues held iopen glocks on errors.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/inode.c')
| -rw-r--r-- | fs/gfs2/inode.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 3130f85d2b3f..d8cd835c560a 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -225,6 +225,10 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, return inode; fail: + if (gfs2_holder_initialized(&ip->i_iopen_gh)) { + glock_clear_object(ip->i_iopen_gh.gh_gl, ip); + gfs2_glock_dq_uninit(&ip->i_iopen_gh); + } if (io_gl) gfs2_glock_put(io_gl); if (gfs2_holder_initialized(&i_gh)) |