filelock: move file locking definitions to separate header file

The file locking definitions have lived in fs.h since the dawn of time,
but they are only used by a small subset of the source files that
include it.

Move the file locking definitions to a new header file, and add the
appropriate #include directives to the source files that need them. By
doing this we trim down fs.h a bit and limit the amount of rebuilding
that has to be done when we make changes to the file locking APIs.

Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Steve French <stfrench@microsoft.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>

1 files changed, 0 insertions, 429 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c1769a2c5d708..006278d84d2fd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1003,135 +1003,11 @@ static inline struct file *get_file(struct file *f)
 #define MAX_LFS_FILESIZE 	((loff_t)LLONG_MAX)
 #endif
 
-#define FL_POSIX	1
-#define FL_FLOCK	2
-#define FL_DELEG	4	/* NFSv4 delegation */
-#define FL_ACCESS	8	/* not trying to lock, just looking */
-#define FL_EXISTS	16	/* when unlocking, test for existence */
-#define FL_LEASE	32	/* lease held on this file */
-#define FL_CLOSE	64	/* unlock on close */
-#define FL_SLEEP	128	/* A blocking lock */
-#define FL_DOWNGRADE_PENDING	256 /* Lease is being downgraded */
-#define FL_UNLOCK_PENDING	512 /* Lease is being broken */
-#define FL_OFDLCK	1024	/* lock is "owned" by struct file */
-#define FL_LAYOUT	2048	/* outstanding pNFS layout */
-#define FL_RECLAIM	4096	/* reclaiming from a reboot server */
-
-#define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE)
-
-/*
- * Special return value from posix_lock_file() and vfs_lock_file() for
- * asynchronous locking.
- */
-#define FILE_LOCK_DEFERRED 1
-
 /* legacy typedef, should eventually be removed */
 typedef void *fl_owner_t;
 
 struct file_lock;
 
-struct file_lock_operations {
-	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
-	void (*fl_release_private)(struct file_lock *);
-};
-
-struct lock_manager_operations {
-	void *lm_mod_owner;
-	fl_owner_t (*lm_get_owner)(fl_owner_t);
-	void (*lm_put_owner)(fl_owner_t);
-	void (*lm_notify)(struct file_lock *);	/* unblock callback */
-	int (*lm_grant)(struct file_lock *, int);
-	bool (*lm_break)(struct file_lock *);
-	int (*lm_change)(struct file_lock *, int, struct list_head *);
-	void (*lm_setup)(struct file_lock *, void **);
-	bool (*lm_breaker_owns_lease)(struct file_lock *);
-	bool (*lm_lock_expirable)(struct file_lock *cfl);
-	void (*lm_expire_lock)(void);
-};
-
-struct lock_manager {
-	struct list_head list;
-	/*
-	 * NFSv4 and up also want opens blocked during the grace period;
-	 * NLM doesn't care:
-	 */
-	bool block_opens;
-};
-
-struct net;
-void locks_start_grace(struct net *, struct lock_manager *);
-void locks_end_grace(struct lock_manager *);
-bool locks_in_grace(struct net *);
-bool opens_in_grace(struct net *);
-
-/* that will die - we need it for nfs_lock_info */
-#include <linux/nfs_fs_i.h>
-
-/*
- * struct file_lock represents a generic "file lock". It's used to represent
- * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
- * note that the same struct is used to represent both a request for a lock and
- * the lock itself, but the same object is never used for both.
- *
- * FIXME: should we create a separate "struct lock_request" to help distinguish
- * these two uses?
- *
- * The varous i_flctx lists are ordered by:
- *
- * 1) lock owner
- * 2) lock range start
- * 3) lock range end
- *
- * Obviously, the last two criteria only matter for POSIX locks.
- */
-struct file_lock {
-	struct file_lock *fl_blocker;	/* The lock, that is blocking us */
-	struct list_head fl_list;	/* link into file_lock_context */
-	struct hlist_node fl_link;	/* node in global lists */
-	struct list_head fl_blocked_requests;	/* list of requests with
-						 * ->fl_blocker pointing here
-						 */
-	struct list_head fl_blocked_member;	/* node in
-						 * ->fl_blocker->fl_blocked_requests
-						 */
-	fl_owner_t fl_owner;
-	unsigned int fl_flags;
-	unsigned char fl_type;
-	unsigned int fl_pid;
-	int fl_link_cpu;		/* what cpu's list is this on? */
-	wait_queue_head_t fl_wait;
-	struct file *fl_file;
-	loff_t fl_start;
-	loff_t fl_end;
-
-	struct fasync_struct *	fl_fasync; /* for lease break notifications */
-	/* for lease breaks: */
-	unsigned long fl_break_time;
-	unsigned long fl_downgrade_time;
-
-	const struct file_lock_operations *fl_ops;	/* Callbacks for filesystems */
-	const struct lock_manager_operations *fl_lmops;	/* Callbacks for lockmanagers */
-	union {
-		struct nfs_lock_info	nfs_fl;
-		struct nfs4_lock_info	nfs4_fl;
-		struct {
-			struct list_head link;	/* link in AFS vnode's pending_locks list */
-			int state;		/* state of grant or error if -ve */
-			unsigned int	debug_id;
-		} afs;
-		struct {
-			struct inode *inode;
-		} ceph;
-	} fl_u;
-} __randomize_layout;
-
-struct file_lock_context {
-	spinlock_t		flc_lock;
-	struct list_head	flc_flock;
-	struct list_head	flc_posix;
-	struct list_head	flc_lease;
-};
-
 /* The following constant reflects the upper bound of the file/locking space */
 #ifndef OFFSET_MAX
 #define OFFSET_MAX	type_max(loff_t)
@@ -1140,216 +1016,6 @@ struct file_lock_context {
 
 extern void send_sigio(struct fown_struct *fown, int fd, int band);
 
-#define locks_inode(f) file_inode(f)
-
-#ifdef CONFIG_FILE_LOCKING
-extern int fcntl_getlk(struct file *, unsigned int, struct flock *);
-extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
-			struct flock *);
-
-#if BITS_PER_LONG == 32
-extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *);
-extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
-			struct flock64 *);
-#endif
-
-extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
-extern int fcntl_getlease(struct file *filp);
-
-/* fs/locks.c */
-void locks_free_lock_context(struct inode *inode);
-void locks_free_lock(struct file_lock *fl);
-extern void locks_init_lock(struct file_lock *);
-extern struct file_lock * locks_alloc_lock(void);
-extern void locks_copy_lock(struct file_lock *, struct file_lock *);
-extern void locks_copy_conflock(struct file_lock *, struct file_lock *);
-extern void locks_remove_posix(struct file *, fl_owner_t);
-extern void locks_remove_file(struct file *);
-extern void locks_release_private(struct file_lock *);
-extern void posix_test_lock(struct file *, struct file_lock *);
-extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
-extern int locks_delete_block(struct file_lock *);
-extern int vfs_test_lock(struct file *, struct file_lock *);
-extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
-extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
-bool vfs_inode_has_locks(struct inode *inode);
-extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
-extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
-extern void lease_get_mtime(struct inode *, struct timespec64 *time);
-extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
-extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
-extern int lease_modify(struct file_lock *, int, struct list_head *);
-
-struct notifier_block;
-extern int lease_register_notifier(struct notifier_block *);
-extern void lease_unregister_notifier(struct notifier_block *);
-
-struct files_struct;
-extern void show_fd_locks(struct seq_file *f,
-			 struct file *filp, struct files_struct *files);
-extern bool locks_owner_has_blockers(struct file_lock_context *flctx,
-			fl_owner_t owner);
-
-static inline struct file_lock_context *
-locks_inode_context(const struct inode *inode)
-{
-	return smp_load_acquire(&inode->i_flctx);
-}
-
-#else /* !CONFIG_FILE_LOCKING */
-static inline int fcntl_getlk(struct file *file, unsigned int cmd,
-			      struct flock __user *user)
-{
-	return -EINVAL;
-}
-
-static inline int fcntl_setlk(unsigned int fd, struct file *file,
-			      unsigned int cmd, struct flock __user *user)
-{
-	return -EACCES;
-}
-
-#if BITS_PER_LONG == 32
-static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
-				struct flock64 *user)
-{
-	return -EINVAL;
-}
-
-static inline int fcntl_setlk64(unsigned int fd, struct file *file,
-				unsigned int cmd, struct flock64 *user)
-{
-	return -EACCES;
-}
-#endif
-static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
-{
-	return -EINVAL;
-}
-
-static inline int fcntl_getlease(struct file *filp)
-{
-	return F_UNLCK;
-}
-
-static inline void
-locks_free_lock_context(struct inode *inode)
-{
-}
-
-static inline void locks_init_lock(struct file_lock *fl)
-{
-	return;
-}
-
-static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
-{
-	return;
-}
-
-static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
-{
-	return;
-}
-
-static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
-{
-	return;
-}
-
-static inline void locks_remove_file(struct file *filp)
-{
-	return;
-}
-
-static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
-{
-	return;
-}
-
-static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
-				  struct file_lock *conflock)
-{
-	return -ENOLCK;
-}
-
-static inline int locks_delete_block(struct file_lock *waiter)
-{
-	return -ENOENT;
-}
-
-static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
-{
-	return 0;
-}
-
-static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
-				struct file_lock *fl, struct file_lock *conf)
-{
-	return -ENOLCK;
-}
-
-static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
-{
-	return 0;
-}
-
-static inline bool vfs_inode_has_locks(struct inode *inode)
-{
-	return false;
-}
-
-static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl)
-{
-	return -ENOLCK;
-}
-
-static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
-{
-	return 0;
-}
-
-static inline void lease_get_mtime(struct inode *inode,
-				   struct timespec64 *time)
-{
-	return;
-}
-
-static inline int generic_setlease(struct file *filp, long arg,
-				    struct file_lock **flp, void **priv)
-{
-	return -EINVAL;
-}
-
-static inline int vfs_setlease(struct file *filp, long arg,
-			       struct file_lock **lease, void **priv)
-{
-	return -EINVAL;
-}
-
-static inline int lease_modify(struct file_lock *fl, int arg,
-			       struct list_head *dispose)
-{
-	return -EINVAL;
-}
-
-struct files_struct;
-static inline void show_fd_locks(struct seq_file *f,
-			struct file *filp, struct files_struct *files) {}
-static inline bool locks_owner_has_blockers(struct file_lock_context *flctx,
-			fl_owner_t owner)
-{
-	return false;
-}
-
-static inline struct file_lock_context *
-locks_inode_context(const struct inode *inode)
-{
-	return NULL;
-}
-
-#endif /* !CONFIG_FILE_LOCKING */
-
 static inline struct inode *file_inode(const struct file *f)
 {
 	return f->f_inode;
@@ -1360,11 +1026,6 @@ static inline struct dentry *file_dentry(const struct file *file)
 	return d_real(file->f_path.dentry, file_inode(file));
 }
 
-static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
-{
-	return locks_lock_inode_wait(locks_inode(filp), fl);
-}
-
 struct fasync_struct {
 	rwlock_t		fa_lock;
 	int			magic;
@@ -2624,96 +2285,6 @@ extern struct kobject *fs_kobj;
 
 #define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
 
-#ifdef CONFIG_FILE_LOCKING
-static inline int break_lease(struct inode *inode, unsigned int mode)
-{
-	/*
-	 * Since this check is lockless, we must ensure that any refcounts
-	 * taken are done before checking i_flctx->flc_lease. Otherwise, we
-	 * could end up racing with tasks trying to set a new lease on this
-	 * file.
-	 */
-	smp_mb();
-	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
-		return __break_lease(inode, mode, FL_LEASE);
-	return 0;
-}
-
-static inline int break_deleg(struct inode *inode, unsigned int mode)
-{
-	/*
-	 * Since this check is lockless, we must ensure that any refcounts
-	 * taken are done before checking i_flctx->flc_lease. Otherwise, we
-	 * could end up racing with tasks trying to set a new lease on this
-	 * file.
-	 */
-	smp_mb();
-	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
-		return __break_lease(inode, mode, FL_DELEG);
-	return 0;
-}
-
-static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
-{
-	int ret;
-
-	ret = break_deleg(inode, O_WRONLY|O_NONBLOCK);
-	if (ret == -EWOULDBLOCK && delegated_inode) {
-		*delegated_inode = inode;
-		ihold(inode);
-	}
-	return ret;
-}
-
-static inline int break_deleg_wait(struct inode **delegated_inode)
-{
-	int ret;
-
-	ret = break_deleg(*delegated_inode, O_WRONLY);
-	iput(*delegated_inode);
-	*delegated_inode = NULL;
-	return ret;
-}
-
-static inline int break_layout(struct inode *inode, bool wait)
-{
-	smp_mb();
-	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
-		return __break_lease(inode,
-				wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
-				FL_LAYOUT);
-	return 0;
-}
-
-#else /* !CONFIG_FILE_LOCKING */
-static inline int break_lease(struct inode *inode, unsigned int mode)
-{
-	return 0;
-}
-
-static inline int break_deleg(struct inode *inode, unsigned int mode)
-{
-	return 0;
-}
-
-static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
-{
-	return 0;
-}
-
-static inline int break_deleg_wait(struct inode **delegated_inode)
-{
-	BUG();
-	return 0;
-}
-
-static inline int break_layout(struct inode *inode, bool wait)
-{
-	return 0;
-}
-
-#endif /* CONFIG_FILE_LOCKING */
-
 /* fs/open.c */
 struct audit_names;
 struct filename {