File descriptor is irrelevent when LOOKUP_ROOT is set.
Introduce AT_FDINV to avoid using hard coded value or reusing
existing macro.
Signed-off-by: Yan Hong <clouds.yan@xxxxxxxxx>
---
fs/namei.c | 11 ++++++-----
include/linux/fcntl.h | 2 ++
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index c5b85b3..5ffd97d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2034,8 +2034,8 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
nd.root.dentry = dentry;
nd.root.mnt = mnt;
BUG_ON(flags & LOOKUP_PARENT);
- /* the first argument of do_path_lookup() is ignored with LOOKUP_ROOT */
- err = do_path_lookup(AT_FDCWD, name, flags | LOOKUP_ROOT, &nd);
+
+ err = do_path_lookup(AT_FDINV, name, flags | LOOKUP_ROOT, &nd);
if (!err)
*path = nd.path;
return err;
@@ -2969,11 +2969,12 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
if (dentry->d_inode->i_op->follow_link && op->intent & LOOKUP_OPEN)
return ERR_PTR(-ELOOP);
- file = path_openat(-1, name, &nd, op, flags | LOOKUP_RCU);
+ file = path_openat(AT_FDINV, name, &nd, op, flags | LOOKUP_RCU);
if (unlikely(file == ERR_PTR(-ECHILD)))
- file = path_openat(-1, name, &nd, op, flags);
+ file = path_openat(AT_FDINV, name, &nd, op, flags);
if (unlikely(file == ERR_PTR(-ESTALE)))
- file = path_openat(-1, name, &nd, op, flags | LOOKUP_REVAL);
+ file = path_openat(AT_FDINV, name, &nd, op,
+ flags | LOOKUP_REVAL);
return file;
}
diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index f550f89..abd94fe 100644
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h
@@ -41,6 +41,8 @@
#define AT_FDCWD -100 /* Special value used to indicate
openat should use the current
working directory. */
+#define AT_FDINV -200 /* Special value used when LOOKUP_ROOT
+ is set. */
#define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */
#define AT_REMOVEDIR 0x200 /* Remove directory instead of
unlinking file. */
--
1.7.9.5
--
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