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authorAl Viro <viro@www.linux.org.uk>2005-06-06 13:36:06 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-06 14:42:26 -0700
commite13b210f6f7bdc44dfee0a9bbd633a32db0d6333 (patch)
treef957ec2fc24f8a9eb84dcffe76341262c1acedf0
parent463ffb2e9d39c2a3fd8c3c1d4a34e01f2078f972 (diff)
[PATCH] namei fixes (10/19)
In open_namei(), __follow_down() loop turned into __follow_mount(). Instead of if we are on a mountpoint dentry if O_NOFOLLOW checks fail drop path.dentry drop nd return do equivalent of follow_mount(&path.mnt, &path.dentry) nd->mnt = path.mnt we do if __follow_mount(path) had, indeed, traversed mountpoint /* now both nd->mnt and path.mnt are pinned down */ if O_NOFOLLOW checks fail drop path.dentry drop path.mnt drop nd return mntput(nd->mnt) nd->mnt = path.mnt Now __follow_down() can be folded into follow_down() - no other callers left. We need to reorder dput()/mntput() there - same problem as in follow_mount(). Equivalent transformation + fix for a bug in O_NOFOLLOW handling - we used to get -ELOOP if we had the same fs mounted on /foo and /bar, had something bound on /bar/baz and tried to open /foo/baz with O_NOFOLLOW. And fix of too-early-mntput() race in follow_down() Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/namei.c20
1 files changed, 9 insertions, 11 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 23a1ad46797..935b08d8dcd 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -612,26 +612,21 @@ static int follow_mount(struct vfsmount **mnt, struct dentry **dentry)
/* no need for dcache_lock, as serialization is taken care in
* namespace.c
*/
-static inline int __follow_down(struct vfsmount **mnt, struct dentry **dentry)
+int follow_down(struct vfsmount **mnt, struct dentry **dentry)
{
struct vfsmount *mounted;
mounted = lookup_mnt(*mnt, *dentry);
if (mounted) {
+ dput(*dentry);
mntput(*mnt);
*mnt = mounted;
- dput(*dentry);
*dentry = dget(mounted->mnt_root);
return 1;
}
return 0;
}
-int follow_down(struct vfsmount **mnt, struct dentry **dentry)
-{
- return __follow_down(mnt,dentry);
-}
-
static inline void follow_dotdot(struct vfsmount **mnt, struct dentry **dentry)
{
while(1) {
@@ -1498,11 +1493,14 @@ do_last:
if (flag & O_EXCL)
goto exit_dput;
- if (d_mountpoint(path.dentry)) {
+ if (__follow_mount(&path)) {
error = -ELOOP;
- if (flag & O_NOFOLLOW)
- goto exit_dput;
- while (__follow_down(&path.mnt,&path.dentry) && d_mountpoint(path.dentry));
+ if (flag & O_NOFOLLOW) {
+ dput(path.dentry);
+ mntput(path.mnt);
+ goto exit;
+ }
+ mntput(nd->mnt);
nd->mnt = path.mnt;
}
error = -ENOENT;