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Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c64
1 files changed, 28 insertions, 36 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 209c51a5226c..671c3c1a3425 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -596,14 +596,12 @@ static void terminate_walk(struct nameidata *nd)
path_put(&nd->path);
for (i = 0; i < nd->depth; i++)
path_put(&nd->stack[i].link);
- if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
+ if (nd->flags & LOOKUP_ROOT_GRABBED) {
path_put(&nd->root);
- nd->root.mnt = NULL;
+ nd->flags &= ~LOOKUP_ROOT_GRABBED;
}
} else {
nd->flags &= ~LOOKUP_RCU;
- if (!(nd->flags & LOOKUP_ROOT))
- nd->root.mnt = NULL;
rcu_read_unlock();
}
nd->depth = 0;
@@ -641,6 +639,14 @@ static bool legitimize_links(struct nameidata *nd)
return true;
}
+static bool legitimize_root(struct nameidata *nd)
+{
+ if (!nd->root.mnt || (nd->flags & LOOKUP_ROOT))
+ return true;
+ nd->flags |= LOOKUP_ROOT_GRABBED;
+ return legitimize_path(nd, &nd->root, nd->root_seq);
+}
+
/*
* Path walking has 2 modes, rcu-walk and ref-walk (see
* Documentation/filesystems/path-lookup.txt). In situations when we can't
@@ -671,23 +677,18 @@ static int unlazy_walk(struct nameidata *nd)
nd->flags &= ~LOOKUP_RCU;
if (unlikely(!legitimize_links(nd)))
- goto out2;
- if (unlikely(!legitimize_path(nd, &nd->path, nd->seq)))
goto out1;
- if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
- if (unlikely(!legitimize_path(nd, &nd->root, nd->root_seq)))
- goto out;
- }
+ if (unlikely(!legitimize_path(nd, &nd->path, nd->seq)))
+ goto out;
+ if (unlikely(!legitimize_root(nd)))
+ goto out;
rcu_read_unlock();
BUG_ON(nd->inode != parent->d_inode);
return 0;
-out2:
+out1:
nd->path.mnt = NULL;
nd->path.dentry = NULL;
-out1:
- if (!(nd->flags & LOOKUP_ROOT))
- nd->root.mnt = NULL;
out:
rcu_read_unlock();
return -ECHILD;
@@ -727,23 +728,14 @@ static int unlazy_child(struct nameidata *nd, struct dentry *dentry, unsigned se
*/
if (unlikely(!lockref_get_not_dead(&dentry->d_lockref)))
goto out;
- if (unlikely(read_seqcount_retry(&dentry->d_seq, seq))) {
- rcu_read_unlock();
- dput(dentry);
- goto drop_root_mnt;
- }
+ if (unlikely(read_seqcount_retry(&dentry->d_seq, seq)))
+ goto out_dput;
/*
* Sequence counts matched. Now make sure that the root is
* still valid and get it if required.
*/
- if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
- if (unlikely(!legitimize_path(nd, &nd->root, nd->root_seq))) {
- rcu_read_unlock();
- dput(dentry);
- return -ECHILD;
- }
- }
-
+ if (unlikely(!legitimize_root(nd)))
+ goto out_dput;
rcu_read_unlock();
return 0;
@@ -753,9 +745,10 @@ out1:
nd->path.dentry = NULL;
out:
rcu_read_unlock();
-drop_root_mnt:
- if (!(nd->flags & LOOKUP_ROOT))
- nd->root.mnt = NULL;
+ return -ECHILD;
+out_dput:
+ rcu_read_unlock();
+ dput(dentry);
return -ECHILD;
}
@@ -819,6 +812,7 @@ static void set_root(struct nameidata *nd)
} while (read_seqcount_retry(&fs->seq, seq));
} else {
get_fs_root(fs, &nd->root);
+ nd->flags |= LOOKUP_ROOT_GRABBED;
}
}
@@ -1735,8 +1729,6 @@ static int pick_link(struct nameidata *nd, struct path *link,
nd->flags &= ~LOOKUP_RCU;
nd->path.mnt = NULL;
nd->path.dentry = NULL;
- if (!(nd->flags & LOOKUP_ROOT))
- nd->root.mnt = NULL;
rcu_read_unlock();
} else if (likely(unlazy_walk(nd)) == 0)
error = nd_alloc_stack(nd);
@@ -2350,7 +2342,7 @@ int filename_lookup(int dfd, struct filename *name, unsigned flags,
retval = path_lookupat(&nd, flags | LOOKUP_REVAL, path);
if (likely(!retval))
- audit_inode(name, path->dentry, flags & LOOKUP_PARENT);
+ audit_inode(name, path->dentry, 0);
restore_nameidata();
putname(name);
return retval;
@@ -2391,7 +2383,7 @@ static struct filename *filename_parentat(int dfd, struct filename *name,
if (likely(!retval)) {
*last = nd.last;
*type = nd.last_type;
- audit_inode(name, parent->dentry, LOOKUP_PARENT);
+ audit_inode(name, parent->dentry, AUDIT_INODE_PARENT);
} else {
putname(name);
name = ERR_PTR(retval);
@@ -2718,7 +2710,7 @@ filename_mountpoint(int dfd, struct filename *name, struct path *path,
if (unlikely(error == -ESTALE))
error = path_mountpoint(&nd, flags | LOOKUP_REVAL, path);
if (likely(!error))
- audit_inode(name, path->dentry, flags & LOOKUP_NO_EVAL);
+ audit_inode(name, path->dentry, AUDIT_INODE_NOEVAL);
restore_nameidata();
putname(name);
return error;
@@ -3299,7 +3291,7 @@ static int do_last(struct nameidata *nd,
if (error)
return error;
- audit_inode(nd->name, dir, LOOKUP_PARENT);
+ audit_inode(nd->name, dir, AUDIT_INODE_PARENT);
/* trailing slashes? */
if (unlikely(nd->last.name[nd->last.len]))
return -EISDIR;