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-rw-r--r--kernel/fs/kernfs/dir.c23
-rw-r--r--kernel/fs/kernfs/file.c1
-rw-r--r--kernel/fs/kernfs/kernfs-internal.h1
-rw-r--r--kernel/fs/kernfs/symlink.c25
4 files changed, 32 insertions, 18 deletions
diff --git a/kernel/fs/kernfs/dir.c b/kernel/fs/kernfs/dir.c
index 2d48d28e1..91e004518 100644
--- a/kernel/fs/kernfs/dir.c
+++ b/kernel/fs/kernfs/dir.c
@@ -92,6 +92,29 @@ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
}
/**
+ * kernfs_path_len - determine the length of the full path of a given node
+ * @kn: kernfs_node of interest
+ *
+ * The returned length doesn't include the space for the terminating '\0'.
+ */
+size_t kernfs_path_len(struct kernfs_node *kn)
+{
+ size_t len = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kernfs_rename_lock, flags);
+
+ do {
+ len += strlen(kn->name) + 1;
+ kn = kn->parent;
+ } while (kn && kn->parent);
+
+ spin_unlock_irqrestore(&kernfs_rename_lock, flags);
+
+ return len;
+}
+
+/**
* kernfs_path - build full path of a given node
* @kn: kernfs_node of interest
* @buf: buffer to copy @kn's name into
diff --git a/kernel/fs/kernfs/file.c b/kernel/fs/kernfs/file.c
index 2bacb9988..7247252ee 100644
--- a/kernel/fs/kernfs/file.c
+++ b/kernel/fs/kernfs/file.c
@@ -785,7 +785,6 @@ static unsigned int kernfs_fop_poll(struct file *filp, poll_table *wait)
struct kernfs_node *kn = filp->f_path.dentry->d_fsdata;
struct kernfs_open_node *on = kn->attr.open;
- /* need parent for the kobj, grab both */
if (!kernfs_get_active(kn))
goto trigger;
diff --git a/kernel/fs/kernfs/kernfs-internal.h b/kernel/fs/kernfs/kernfs-internal.h
index af9fa7499..6762bfbd8 100644
--- a/kernel/fs/kernfs/kernfs-internal.h
+++ b/kernel/fs/kernfs/kernfs-internal.h
@@ -76,7 +76,6 @@ extern struct kmem_cache *kernfs_node_cache;
/*
* inode.c
*/
-struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn);
void kernfs_evict_inode(struct inode *inode);
int kernfs_iop_permission(struct inode *inode, int mask);
int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
diff --git a/kernel/fs/kernfs/symlink.c b/kernel/fs/kernfs/symlink.c
index 8a198898e..db272528a 100644
--- a/kernel/fs/kernfs/symlink.c
+++ b/kernel/fs/kernfs/symlink.c
@@ -112,25 +112,18 @@ static int kernfs_getlink(struct dentry *dentry, char *path)
return error;
}
-static void *kernfs_iop_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *kernfs_iop_follow_link(struct dentry *dentry, void **cookie)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
- if (page) {
- error = kernfs_getlink(dentry, (char *) page);
- if (error < 0)
- free_page((unsigned long)page);
- }
- nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
- return NULL;
-}
-
-static void kernfs_iop_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
-{
- char *page = nd_get_link(nd);
- if (!IS_ERR(page))
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+ error = kernfs_getlink(dentry, (char *)page);
+ if (unlikely(error < 0)) {
free_page((unsigned long)page);
+ return ERR_PTR(error);
+ }
+ return *cookie = (char *)page;
}
const struct inode_operations kernfs_symlink_iops = {
@@ -140,7 +133,7 @@ const struct inode_operations kernfs_symlink_iops = {
.listxattr = kernfs_iop_listxattr,
.readlink = generic_readlink,
.follow_link = kernfs_iop_follow_link,
- .put_link = kernfs_iop_put_link,
+ .put_link = free_page_put_link,
.setattr = kernfs_iop_setattr,
.getattr = kernfs_iop_getattr,
.permission = kernfs_iop_permission,