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authorAl Viro <viro@zeniv.linux.org.uk>2011-03-04 22:39:30 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-14 16:15:25 +0300
commita7472baba22dd5d68580f528374f93421b33667e (patch)
treea7919a0dea2c58fa498e17d6c7be19fb0b9b571f /fs/namei.c
parentef7562d5283a91da3ba5c14de3221f47b7f08823 (diff)
downloadlinux-a7472baba22dd5d68580f528374f93421b33667e.tar.xz
make nameidata_dentry_drop_rcu_maybe() always leave RCU mode
Now we have do_follow_link() guaranteed to leave without dangling RCU and the next step will get LOOKUP_RCU logics completely out of link_path_walk(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/namei.c b/fs/namei.c
index ea14bfb04785..53bba7c1a520 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -498,8 +498,15 @@ err_root:
/* Try to drop out of rcu-walk mode if we were in it, otherwise do nothing. */
static inline int nameidata_dentry_drop_rcu_maybe(struct nameidata *nd, struct dentry *dentry)
{
- if (nd->flags & LOOKUP_RCU)
- return nameidata_dentry_drop_rcu(nd, dentry);
+ if (nd->flags & LOOKUP_RCU) {
+ if (unlikely(nameidata_dentry_drop_rcu(nd, dentry))) {
+ nd->flags &= ~LOOKUP_RCU;
+ nd->root.mnt = NULL;
+ rcu_read_unlock();
+ br_read_unlock(vfsmount_lock);
+ return -ECHILD;
+ }
+ }
return 0;
}
@@ -1424,7 +1431,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
if (inode && inode->i_op->follow_link) {
err = do_follow_link(inode, &next, nd);
if (err)
- goto return_err;
+ return err;
nd->inode = nd->path.dentry->d_inode;
} else {
path_to_nameidata(&next, nd);
@@ -1455,7 +1462,7 @@ last_component:
(lookup_flags & LOOKUP_FOLLOW)) {
err = do_follow_link(inode, &next, nd);
if (err)
- goto return_err;
+ return err;
nd->inode = nd->path.dentry->d_inode;
} else {
path_to_nameidata(&next, nd);
@@ -1477,7 +1484,6 @@ lookup_parent:
}
if (!(nd->flags & LOOKUP_RCU))
path_put(&nd->path);
-return_err:
if (nd->flags & LOOKUP_RCU) {
nd->flags &= ~LOOKUP_RCU;
nd->root.mnt = NULL;