Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull more vfs updates from Al Viro:
 "In this pile:

   - autofs-namespace series
   - dedupe stuff
   - more struct path constification"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (40 commits)
  ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features
  ocfs2: charge quota for reflinked blocks
  ocfs2: fix bad pointer cast
  ocfs2: always unlock when completing dio writes
  ocfs2: don't eat io errors during _dio_end_io_write
  ocfs2: budget for extent tree splits when adding refcount flag
  ocfs2: prohibit refcounted swapfiles
  ocfs2: add newlines to some error messages
  ocfs2: convert inode refcount test to a helper
  simple_write_end(): don't zero in short copy into uptodate
  exofs: don't mess with simple_write_{begin,end}
  9p: saner ->write_end() on failing copy into non-uptodate page
  fix gfs2_stuffed_write_end() on short copies
  fix ceph_write_end()
  nfs_write_end(): fix handling of short copies
  vfs: refactor clone/dedupe_file_range common functions
  fs: try to clone files first in vfs_copy_file_range
  vfs: misc struct path constification
  namespace.c: constify struct path passed to a bunch of primitives
  quota: constify struct path in quota_on
  ...

include/linux/audit.h

@@ -147,7 +147,7 @@ extern void		    audit_log_d_path(struct audit_buffer *ab,
 extern void		    audit_log_key(struct audit_buffer *ab,
 					  char *key);
 extern void		    audit_log_link_denied(const char *operation,
-						  struct path *link);
+						  const struct path *link);
 extern void		    audit_log_lost(const char *message);
 #ifdef CONFIG_SECURITY
 extern void 		    audit_log_secctx(struct audit_buffer *ab, u32 secid);

include/linux/dcache.h

@@ -139,7 +139,7 @@ struct dentry_operations {
 	void (*d_iput)(struct dentry *, struct inode *);
 	char *(*d_dname)(struct dentry *, char *, int);
 	struct vfsmount *(*d_automount)(struct path *);
-	int (*d_manage)(struct dentry *, bool);
+	int (*d_manage)(const struct path *, bool);
 	struct dentry *(*d_real)(struct dentry *, const struct inode *,
 				 unsigned int);
 } ____cacheline_aligned;
@@ -254,7 +254,7 @@ extern struct dentry *d_find_alias(struct inode *);
 extern void d_prune_aliases(struct inode *);
 
 /* test whether we have any submounts in a subdir tree */
-extern int have_submounts(struct dentry *);
+extern int path_has_submounts(const struct path *);
 
 /*
  * This adds the entry to the hash queues.

include/linux/dcookies.h

@@ -44,7 +44,7 @@ void dcookie_unregister(struct dcookie_user * user);
  *
  * Returns 0 on success, with *cookie filled in
  */
-int get_dcookie(struct path *path, unsigned long *cookie);
+int get_dcookie(const struct path *path, unsigned long *cookie);
 
 #else
 
@@ -58,7 +58,7 @@ static inline void dcookie_unregister(struct dcookie_user * user)
 	return;
 }
 
-static inline int get_dcookie(struct path *path, unsigned long *cookie)
+static inline int get_dcookie(const struct path *path, unsigned long *cookie)
 {
 	return -ENOSYS;
 }

include/linux/file.h

@@ -17,7 +17,7 @@ struct file_operations;
 struct vfsmount;
 struct dentry;
 struct path;
-extern struct file *alloc_file(struct path *, fmode_t mode,
+extern struct file *alloc_file(const struct path *, fmode_t mode,
 	const struct file_operations *fop);
 
 static inline void fput_light(struct file *file, int fput_needed)

include/linux/fs.h

@@ -1726,8 +1726,14 @@ extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
 		unsigned long, loff_t *, int);
 extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
 				   loff_t, size_t, unsigned int);
+extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
+				      struct inode *inode_out, loff_t pos_out,
+				      u64 *len, bool is_dedupe);
 extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
 		struct file *file_out, loff_t pos_out, u64 len);
+extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
+					 struct inode *dest, loff_t destoff,
+					 loff_t len, bool *is_same);
 extern int vfs_dedupe_file_range(struct file *file,
 				 struct file_dedupe_range *same);
 
@@ -2084,11 +2090,11 @@ extern int may_umount_tree(struct vfsmount *);
 extern int may_umount(struct vfsmount *);
 extern long do_mount(const char *, const char __user *,
 		     const char *, unsigned long, void *);
-extern struct vfsmount *collect_mounts(struct path *);
+extern struct vfsmount *collect_mounts(const struct path *);
 extern void drop_collected_mounts(struct vfsmount *);
 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
 			  struct vfsmount *);
-extern int vfs_statfs(struct path *, struct kstatfs *);
+extern int vfs_statfs(const struct path *, struct kstatfs *);
 extern int user_statfs(const char __user *, struct kstatfs *);
 extern int fd_statfs(int, struct kstatfs *);
 extern int vfs_ustat(dev_t, struct kstatfs *);
@@ -2657,7 +2663,7 @@ extern struct file * open_exec(const char *);
  
 /* fs/dcache.c -- generic fs support functions */
 extern bool is_subdir(struct dentry *, struct dentry *);
-extern bool path_is_under(struct path *, struct path *);
+extern bool path_is_under(const struct path *, const struct path *);
 
 extern char *file_path(struct file *, char *, int);
 

include/linux/fsnotify.h

@@ -17,7 +17,7 @@
 #include <linux/bug.h>
 
 /* Notify this dentry's parent about a child's events. */
-static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
+static inline int fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
 {
 	if (!dentry)
 		dentry = path->dentry;
@@ -28,7 +28,7 @@ static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u3
 /* simple call site for access decisions */
 static inline int fsnotify_perm(struct file *file, int mask)
 {
-	struct path *path = &file->f_path;
+	const struct path *path = &file->f_path;
 	/*
 	 * Do not use file_inode() here or anywhere in this file to get the
 	 * inode.  That would break *notity on overlayfs.
@@ -176,7 +176,7 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
  */
 static inline void fsnotify_access(struct file *file)
 {
-	struct path *path = &file->f_path;
+	const struct path *path = &file->f_path;
 	struct inode *inode = path->dentry->d_inode;
 	__u32 mask = FS_ACCESS;
 
@@ -194,7 +194,7 @@ static inline void fsnotify_access(struct file *file)
  */
 static inline void fsnotify_modify(struct file *file)
 {
-	struct path *path = &file->f_path;
+	const struct path *path = &file->f_path;
 	struct inode *inode = path->dentry->d_inode;
 	__u32 mask = FS_MODIFY;
 
@@ -212,7 +212,7 @@ static inline void fsnotify_modify(struct file *file)
  */
 static inline void fsnotify_open(struct file *file)
 {
-	struct path *path = &file->f_path;
+	const struct path *path = &file->f_path;
 	struct inode *inode = path->dentry->d_inode;
 	__u32 mask = FS_OPEN;
 
@@ -228,7 +228,7 @@ static inline void fsnotify_open(struct file *file)
  */
 static inline void fsnotify_close(struct file *file)
 {
-	struct path *path = &file->f_path;
+	const struct path *path = &file->f_path;
 	struct inode *inode = path->dentry->d_inode;
 	fmode_t mode = file->f_mode;
 	__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;

include/linux/fsnotify_backend.h

@@ -96,7 +96,7 @@ struct fsnotify_ops {
 			    struct inode *inode,
 			    struct fsnotify_mark *inode_mark,
 			    struct fsnotify_mark *vfsmount_mark,
-			    u32 mask, void *data, int data_type,
+			    u32 mask, const void *data, int data_type,
 			    const unsigned char *file_name, u32 cookie);
 	void (*free_group_priv)(struct fsnotify_group *group);
 	void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
@@ -245,9 +245,9 @@ struct fsnotify_mark {
 /* called from the vfs helpers */
 
 /* main fsnotify call to send events */
-extern int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
+extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
 		    const unsigned char *name, u32 cookie);
-extern int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask);
+extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
 extern void __fsnotify_inode_delete(struct inode *inode);
 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
 extern u32 fsnotify_get_cookie(void);
@@ -357,13 +357,13 @@ extern void fsnotify_init_event(struct fsnotify_event *event,
 
 #else
 
-static inline int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
+static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
 			   const unsigned char *name, u32 cookie)
 {
 	return 0;
 }
 
-static inline int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
+static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
 {
 	return 0;
 }

include/linux/mount.h

@@ -79,12 +79,12 @@ extern void mnt_drop_write(struct vfsmount *mnt);
 extern void mnt_drop_write_file(struct file *file);
 extern void mntput(struct vfsmount *mnt);
 extern struct vfsmount *mntget(struct vfsmount *mnt);
-extern struct vfsmount *mnt_clone_internal(struct path *path);
+extern struct vfsmount *mnt_clone_internal(const struct path *path);
 extern int __mnt_is_readonly(struct vfsmount *mnt);
 extern bool mnt_may_suid(struct vfsmount *mnt);
 
 struct path;
-extern struct vfsmount *clone_private_mount(struct path *path);
+extern struct vfsmount *clone_private_mount(const struct path *path);
 
 struct file_system_type;
 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
@@ -98,4 +98,6 @@ extern dev_t name_to_dev_t(const char *name);
 
 extern unsigned int sysctl_mount_max;
 
+extern bool path_is_mountpoint(const struct path *path);
+
 #endif /* _LINUX_MOUNT_H */

include/linux/quota.h

@@ -431,7 +431,7 @@ struct qc_info {
 
 /* Operations handling requests from userspace */
 struct quotactl_ops {
-	int (*quota_on)(struct super_block *, int, int, struct path *);
+	int (*quota_on)(struct super_block *, int, int, const struct path *);
 	int (*quota_off)(struct super_block *, int);
 	int (*quota_enable)(struct super_block *, unsigned int);
 	int (*quota_disable)(struct super_block *, unsigned int);

include/linux/quotaops.h

@@ -90,7 +90,7 @@ int dquot_file_open(struct inode *inode, struct file *file);
 int dquot_enable(struct inode *inode, int type, int format_id,
 	unsigned int flags);
 int dquot_quota_on(struct super_block *sb, int type, int format_id,
- 	struct path *path);
+	const struct path *path);
 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
  	int format_id, int type);
 int dquot_quota_off(struct super_block *sb, int type);