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authorIan Kent <raven@themaw.net>2008-10-15 22:02:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-16 11:21:39 -0700
commitc0f54d3e54fd7ac6723b2125d881f1b25d21ed16 (patch)
tree3215eeae82b4c81094227b78ad668943c69b46e5 /fs/autofs4/waitq.c
parentbb979d7fc360bc37cbaff43a6fafceb897cb5e47 (diff)
downloadvexpress-lsk-c0f54d3e54fd7ac6723b2125d881f1b25d21ed16.tar.gz
autofs4: track uid and gid of last mount requester
Track the uid and gid of the last process to request a mount for on an autofs dentry. [akpm@linux-foundation.org: fix tpyo in comment] Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/autofs4/waitq.c')
-rw-r--r--fs/autofs4/waitq.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 6d87bb15632..4b67c2a2d77 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -457,6 +457,40 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
status = wq->status;
+ /*
+ * For direct and offset mounts we need to track the requester's
+ * uid and gid in the dentry info struct. This is so it can be
+ * supplied, on request, by the misc device ioctl interface.
+ * This is needed during daemon resatart when reconnecting
+ * to existing, active, autofs mounts. The uid and gid (and
+ * related string values) may be used for macro substitution
+ * in autofs mount maps.
+ */
+ if (!status) {
+ struct autofs_info *ino;
+ struct dentry *de = NULL;
+
+ /* direct mount or browsable map */
+ ino = autofs4_dentry_ino(dentry);
+ if (!ino) {
+ /* If not lookup actual dentry used */
+ de = d_lookup(dentry->d_parent, &dentry->d_name);
+ if (de)
+ ino = autofs4_dentry_ino(de);
+ }
+
+ /* Set mount requester */
+ if (ino) {
+ spin_lock(&sbi->fs_lock);
+ ino->uid = wq->uid;
+ ino->gid = wq->gid;
+ spin_unlock(&sbi->fs_lock);
+ }
+
+ if (de)
+ dput(de);
+ }
+
/* Are we the last process to need status? */
mutex_lock(&sbi->wq_mutex);
if (!--wq->wait_ctr)