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Subject[PATCH 1/5] fs: Introduce vfs_path_lookup
Date
Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu>
---
fs/namei.c | 32 ++++++++++++++++++++++++++++++++
include/linux/namei.h | 2 ++
2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 3449e0a..090cce4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1175,6 +1175,37 @@ int fastcall path_lookup(const char *name, unsigned int flags,
return do_path_lookup(AT_FDCWD, name, flags, nd);
}

+/**
+ * vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair
+ * @dentry: pointer to dentry of the base directory
+ * @mnt: pointer to vfs mount of the base directory
+ * @name: pointer to file name
+ * @flags: lookup flags
+ * @nd: pointer to nameidata
+ */
+int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
+ const char *name, unsigned int flags,
+ struct nameidata *nd)
+{
+ int retval;
+
+ /* same as do_path_lookup */
+ nd->last_type = LAST_ROOT;
+ nd->flags = flags;
+ nd->depth = 0;
+
+ nd->mnt = mntget(mnt);
+ nd->dentry = dget(dentry);
+
+ retval = path_walk(name, nd);
+ if (unlikely(!retval && !audit_dummy_context() && nd->dentry &&
+ nd->dentry->d_inode))
+ audit_inode(name, nd->dentry->d_inode);
+
+ return retval;
+
+}
+
static int __path_lookup_intent_open(int dfd, const char *name,
unsigned int lookup_flags, struct nameidata *nd,
int open_flags, int create_mode)
@@ -2799,6 +2830,7 @@ EXPORT_SYMBOL(__page_symlink);
EXPORT_SYMBOL(page_symlink);
EXPORT_SYMBOL(page_symlink_inode_operations);
EXPORT_SYMBOL(path_lookup);
+EXPORT_SYMBOL(vfs_path_lookup);
EXPORT_SYMBOL(path_release);
EXPORT_SYMBOL(path_walk);
EXPORT_SYMBOL(permission);
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 0ab27ba..4718788 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -70,6 +70,8 @@ extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struc
#define user_path_walk_link(name,nd) \
__user_walk_fd(AT_FDCWD, name, 0, nd)
extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
+extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
+ const char *, unsigned int, struct nameidata *);
extern int FASTCALL(path_walk(const char *, struct nameidata *));
extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
extern void path_release(struct nameidata *);
--
1.5.2.rc1.20.g86b9
-
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