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SubjectRe: [PATCH] autofs4 doesn't expire
spam@streefland.xs4all.nl (Dick Streefland) wrote:
>
> In linux-2.6.0-test1, lookup_mnt() was changed to increment the ref
> count of the returned vfsmount struct. This breaks expiration of
> autofs4 mounts, because lookup_mnt() is called in check_vfsmnt()
> without decrementing the ref count afterwards. The following patch
> fixes this:
>

Neat, thanks.

Probably we should hold onto that ref because we play with the vfsmount
later on. So something like this?


diff -puN fs/autofs4/expire.c~autofs4-expiry-fix fs/autofs4/expire.c
--- 25/fs/autofs4/expire.c~autofs4-expiry-fix 2003-08-05 16:44:41.000000000 -0700
+++ 25-akpm/fs/autofs4/expire.c 2003-08-05 16:48:20.000000000 -0700
@@ -25,7 +25,7 @@ static inline int is_vfsmnt_tree_busy(st
struct list_head *next;
int count;

- count = atomic_read(&mnt->mnt_count) - 1;
+ count = atomic_read(&mnt->mnt_count) - 1 - 1;

repeat:
next = this_parent->mnt_mounts.next;
@@ -70,8 +70,11 @@ static int check_vfsmnt(struct vfsmount
int ret = dentry->d_mounted;
struct vfsmount *vfs = lookup_mnt(mnt, dentry);

- if (vfs && is_vfsmnt_tree_busy(vfs))
- ret--;
+ if (vfs) {
+ if (is_vfsmnt_tree_busy(vfs))
+ ret = 0;
+ mntput(vfs);
+ }
DPRINTK(("check_vfsmnt: ret=%d\n", ret));
return ret;
}
_

-
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