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Skip ctldir znode in zfs_rezget to fix snapdir issues

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Skip ctldir in zfs_rezget, otherwise they will always get invalidated. This
will cause funny behaviour for the mounted snapdirs. Especially for
Linux >= 3.18, d_invalidate will detach the mountpoint and prevent anyone
automount it again as long as someone is still using the detached mount.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4514
Closes #4661
Closes #4672
This commit is contained in:
Chunwei Chen 2016-05-19 17:04:27 -07:00 committed by Brian Behlendorf
parent de0ef912ec
commit cbecb4fb22
1 changed files with 10 additions and 0 deletions
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10
module/zfs/zfs_znode.c
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@ -1167,6 +1167,16 @@ zfs_rezget(znode_t *zp)
uint64_t gen; uint64_t gen;
znode_hold_t *zh; znode_hold_t *zh;
/*
* skip ctldir, otherwise they will always get invalidated. This will
* cause funny behaviour for the mounted snapdirs. Especially for
* Linux >= 3.18, d_invalidate will detach the mountpoint and prevent
* anyone automount it again as long as someone is still using the
* detached mount.
*/
if (zp->z_is_ctldir)
return (0);
zh = zfs_znode_hold_enter(zsb, obj_num); zh = zfs_znode_hold_enter(zsb, obj_num);
mutex_enter(&zp->z_acl_lock); mutex_enter(&zp->z_acl_lock);