[PATCH 05/24] fs: move the putname from filename_lookup to the callers

[Christoph Hellwig]

This allows reusing the struct filename for retries, and will also allow
pushing the getname up the stack for a few places to allower for better
handling of kernel space filenames.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 fs/fs_parser.c |  1 +
 fs/namei.c     | 28 ++++++++++++++++++++--------
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index ab53e42a874aaa..58d5e53d74eeb7 100644
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -171,6 +171,7 @@ int fs_lookup_param(struct fs_context *fc,
                errorf(fc, "%s: Lookup failure for '%s'", param->key, f->name);
                goto out;
        }
+       putname(f);
 
        if (want_bdev &&
            !S_ISBLK(d_backing_inode(_path->dentry)->i_mode)) {
diff --git a/fs/namei.c b/fs/namei.c
index 6ebe400c9736d2..6daffd59e97270 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2372,8 +2372,9 @@ int filename_lookup(int dfd, struct filename *name, 
unsigned flags,
        if (likely(!retval))
                audit_inode(name, path->dentry,
                            flags & LOOKUP_MOUNTPOINT ? AUDIT_INODE_NOEVAL : 0);
+       else
+               putname(name);
        restore_nameidata();
-       putname(name);
        return retval;
 }
 
@@ -2450,8 +2451,12 @@ struct dentry *kern_path_locked(const char *name, struct 
path *path)
 
 int kern_path(const char *name, unsigned int flags, struct path *path)
 {
-       return filename_lookup(AT_FDCWD, getname_kernel(name),
-                              flags, path, NULL);
+       struct filename *f = getname_kernel(name);
+       int ret = filename_lookup(AT_FDCWD, f, flags, path, NULL);
+
+       if (!ret)
+               putname(f);
+       return ret;
 }
 EXPORT_SYMBOL(kern_path);
 
@@ -2468,9 +2473,12 @@ int vfs_path_lookup(struct dentry *dentry, struct 
vfsmount *mnt,
                    struct path *path)
 {
        struct path root = {.mnt = mnt, .dentry = dentry};
-       /* the first argument of filename_lookup() is ignored with root */
-       return filename_lookup(AT_FDCWD, getname_kernel(name),
-                              flags , path, &root);
+       struct filename *f = getname_kernel(name);
+       int ret = filename_lookup(AT_FDCWD, f, flags, path, &root);
+
+       if (!ret)
+               putname(f);
+       return ret;
 }
 EXPORT_SYMBOL(vfs_path_lookup);
 
@@ -2643,8 +2651,12 @@ int path_pts(struct path *path)
 int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
                 struct path *path, int *empty)
 {
-       return filename_lookup(dfd, getname_flags(name, flags, empty),
-                              flags, path, NULL);
+       struct filename *f = getname_flags(name, flags, empty);
+       int ret = filename_lookup(dfd, f, flags, path, NULL);
+
+       if (!ret)
+               putname(f);
+       return ret;
 }
 EXPORT_SYMBOL(user_path_at_empty);
 
-- 
2.27.0