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VFS: allow ->d_manage() to declare -EISDIR in rcu_walk mode.

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In REF-walk mode, ->d_manage can return -EISDIR to indicate
that the dentry is not really a mount trap (or even a mount point)
and that any mounts or any DCACHE_NEED_AUTOMOUNT flag should be
ignored.

RCU-walk mode doesn't currently support this, so if there is a dentry
with DCACHE_NEED_AUTOMOUNT set but which shouldn't be a mount-trap,
lookup_fast() will always drop in REF-walk mode.

With this patch, an -EISDIR from ->d_manage will always cause mounts
and automounts to be ignored, both in REF-walk and RCU-walk.

Bug-fixed-by: Dan Carpenter <[email protected]>
Cc: Ian Kent <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
NeilBrown 2014-08-04 17:06:29 +10:00 • committed by Al Viro
commit b8faf035ea
2 changed files with 18 additions and 12 deletions
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3
Documentation/filesystems/vfs.txt
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@ -1053,7 +1053,8 @@ struct dentry_operations {
If the 'rcu_walk' parameter is true, then the caller is doing a
pathwalk in RCU-walk mode. Sleeping is not permitted in this mode,
and the caller can be asked to leave it and call again by returning
-ECHILD.
-ECHILD. -EISDIR may also be returned to tell pathwalk to
ignore d_automount or any mounts.
This function is only used if DCACHE_MANAGE_TRANSIT is set on the
dentry being transited from.