Merge patch series "fs: Remove old mount API helpers"

Pedro Falcato <pfalcato@suse.de> says:

This patchset contains a very small cleanup, where we remove mount_nodev
(unused since 6.15) and mount_bdev (unused since f2fs converted their
mount API usage, still in -next). While we're at it, we also get to
removing some stale mount API docs.

* patches from https://lore.kernel.org/20250723132156.225410-1-pfalcato@suse.de:
  docs/vfs: Remove mentions to the old mount API helpers
  fs: Remove mount_bdev
  fs: Remove mount_nodev

Link: https://lore.kernel.org/20250723132156.225410-1-pfalcato@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>

3 files changed, 2 insertions, 94 deletions

diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst
index 486a91633474..229eb90c96f2 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -209,31 +209,8 @@ method fills in is the "s_op" field.  This is a pointer to a "struct
 super_operations" which describes the next level of the filesystem
 implementation.
 
-Usually, a filesystem uses one of the generic mount() implementations
-and provides a fill_super() callback instead.  The generic variants are:
-
-``mount_bdev``
-	mount a filesystem residing on a block device
-
-``mount_nodev``
-	mount a filesystem that is not backed by a device
-
-``mount_single``
-	mount a filesystem which shares the instance between all mounts
-
-A fill_super() callback implementation has the following arguments:
-
-``struct super_block *sb``
-	the superblock structure.  The callback must initialize this
-	properly.
-
-``void *data``
-	arbitrary mount options, usually comes as an ASCII string (see
-	"Mount Options" section)
-
-``int silent``
-	whether or not to be silent on error
-
+For more information on mounting (and the new mount API), see
+Documentation/filesystems/mount_api.rst.
 
 The Superblock Object
 =====================
diff --git a/fs/super.c b/fs/super.c
index 7f876f32343a..a038848e8d1f 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1716,49 +1716,6 @@ int get_tree_bdev(struct fs_context *fc,
 }
 EXPORT_SYMBOL(get_tree_bdev);
 
-static int test_bdev_super(struct super_block *s, void *data)
-{
-	return !(s->s_iflags & SB_I_RETIRED) && s->s_dev == *(dev_t *)data;
-}
-
-struct dentry *mount_bdev(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data,
-	int (*fill_super)(struct super_block *, void *, int))
-{
-	struct super_block *s;
-	int error;
-	dev_t dev;
-
-	error = lookup_bdev(dev_name, &dev);
-	if (error)
-		return ERR_PTR(error);
-
-	flags |= SB_NOSEC;
-	s = sget(fs_type, test_bdev_super, set_bdev_super, flags, &dev);
-	if (IS_ERR(s))
-		return ERR_CAST(s);
-
-	if (s->s_root) {
-		if ((flags ^ s->s_flags) & SB_RDONLY) {
-			deactivate_locked_super(s);
-			return ERR_PTR(-EBUSY);
-		}
-	} else {
-		error = setup_bdev_super(s, flags, NULL);
-		if (!error)
-			error = fill_super(s, data, flags & SB_SILENT ? 1 : 0);
-		if (error) {
-			deactivate_locked_super(s);
-			return ERR_PTR(error);
-		}
-
-		s->s_flags |= SB_ACTIVE;
-	}
-
-	return dget(s->s_root);
-}
-EXPORT_SYMBOL(mount_bdev);
-
 void kill_block_super(struct super_block *sb)
 {
 	struct block_device *bdev = sb->s_bdev;
@@ -1773,26 +1730,6 @@ void kill_block_super(struct super_block *sb)
 EXPORT_SYMBOL(kill_block_super);
 #endif
 
-struct dentry *mount_nodev(struct file_system_type *fs_type,
-	int flags, void *data,
-	int (*fill_super)(struct super_block *, void *, int))
-{
-	int error;
-	struct super_block *s = sget(fs_type, NULL, set_anon_super, flags, NULL);
-
-	if (IS_ERR(s))
-		return ERR_CAST(s);
-
-	error = fill_super(s, data, flags & SB_SILENT ? 1 : 0);
-	if (error) {
-		deactivate_locked_super(s);
-		return ERR_PTR(error);
-	}
-	s->s_flags |= SB_ACTIVE;
-	return dget(s->s_root);
-}
-EXPORT_SYMBOL(mount_nodev);
-
 /**
  * vfs_get_tree - Get the mountable root
  * @fc: The superblock configuration context.
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d7ab4f96d705..98afcf455b28 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2713,12 +2713,6 @@ static inline bool is_mgtime(const struct inode *inode)
 	return inode->i_opflags & IOP_MGTIME;
 }
 
-extern struct dentry *mount_bdev(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data,
-	int (*fill_super)(struct super_block *, void *, int));
-extern struct dentry *mount_nodev(struct file_system_type *fs_type,
-	int flags, void *data,
-	int (*fill_super)(struct super_block *, void *, int));
 extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
 void retire_super(struct super_block *sb);
 void generic_shutdown_super(struct super_block *sb);