summaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2020-01-11 01:17:19 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-01-15 09:36:06 +0300
commitc64cd6e34ea340adbb2a0a2f99cc884b96dcdca5 (patch)
tree87786ffcaf8408cacc0784ea2bd280f93b26c7e2 /include
parent1edc8eb2e93130e36ac74ac9c80913815a57d413 (diff)
downloadlinux-c64cd6e34ea340adbb2a0a2f99cc884b96dcdca5.tar.xz
reimplement path_mountpoint() with less magic
... and get rid of a bunch of bugs in it. Background: the reason for path_mountpoint() is that umount() really doesn't want attempts to revalidate the root of what it's trying to umount. The thing we want to avoid actually happen from complete_walk(); solution was to do something parallel to normal path_lookupat() and it both went overboard and got the boilerplate subtly (and not so subtly) wrong. A better solution is to do pretty much what the normal path_lookupat() does, but instead of complete_walk() do unlazy_walk(). All it takes to avoid that ->d_weak_revalidate() call... mountpoint_last() goes away, along with everything it got wrong, and so does the magic around LOOKUP_NO_REVAL. Another source of bugs is that when we traverse mounts at the final location (and we need to do that - umount . expects to get whatever's overmounting ., if any, out of the lookup) we really ought to take care of ->d_manage() - as it is, manual umount of autofs automount in progress can lead to unpleasant surprises for the daemon. Easily solved by using handle_lookup_down() instead of follow_mount(). Tested-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/namei.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 7fe7b87a3ded..07bfb0874033 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -34,7 +34,6 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
/* internal use only */
#define LOOKUP_PARENT 0x0010
-#define LOOKUP_NO_REVAL 0x0080
#define LOOKUP_JUMPED 0x1000
#define LOOKUP_ROOT 0x2000
#define LOOKUP_ROOT_GRABBED 0x0008