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Diffstat (limited to 'include/linux/filelock.h')
-rw-r--r--include/linux/filelock.h129
1 files changed, 100 insertions, 29 deletions
diff --git a/include/linux/filelock.h b/include/linux/filelock.h
index 95e868e09e29..daee999d05f3 100644
--- a/include/linux/filelock.h
+++ b/include/linux/filelock.h
@@ -27,6 +27,7 @@
#define FILE_LOCK_DEFERRED 1
struct file_lock;
+struct file_lease;
struct file_lock_operations {
void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
@@ -39,14 +40,17 @@ struct lock_manager_operations {
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 lease_manager_operations {
+ bool (*lm_break)(struct file_lease *);
+ int (*lm_change)(struct file_lease *, int, struct list_head *);
+ void (*lm_setup)(struct file_lease *, void **);
+ bool (*lm_breaker_owns_lease)(struct file_lease *);
+};
+
struct lock_manager {
struct list_head list;
/*
@@ -85,31 +89,31 @@ bool opens_in_grace(struct net *);
*
* 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
+
+struct file_lock_core {
+ struct file_lock_core *flc_blocker; /* The lock that is blocking us */
+ struct list_head flc_list; /* link into file_lock_context */
+ struct hlist_node flc_link; /* node in global lists */
+ struct list_head flc_blocked_requests; /* list of requests with
* ->fl_blocker pointing here
*/
- struct list_head fl_blocked_member; /* node in
+ struct list_head flc_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;
+ fl_owner_t flc_owner;
+ unsigned int flc_flags;
+ unsigned char flc_type;
+ pid_t flc_pid;
+ int flc_link_cpu; /* what cpu's list is this on? */
+ wait_queue_head_t flc_wait;
+ struct file *flc_file;
+};
+
+struct file_lock {
+ struct file_lock_core c;
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 {
@@ -126,6 +130,15 @@ struct file_lock {
} fl_u;
} __randomize_layout;
+struct file_lease {
+ struct file_lock_core c;
+ struct fasync_struct * fl_fasync; /* for lease break notifications */
+ /* for lease breaks: */
+ unsigned long fl_break_time;
+ unsigned long fl_downgrade_time;
+ const struct lease_manager_operations *fl_lmops; /* Callbacks for lease managers */
+} __randomize_layout;
+
struct file_lock_context {
spinlock_t flc_lock;
struct list_head flc_flock;
@@ -147,11 +160,31 @@ int fcntl_setlk64(unsigned int, struct file *, unsigned int,
int fcntl_setlease(unsigned int fd, struct file *filp, int arg);
int fcntl_getlease(struct file *filp);
+static inline bool lock_is_unlock(struct file_lock *fl)
+{
+ return fl->c.flc_type == F_UNLCK;
+}
+
+static inline bool lock_is_read(struct file_lock *fl)
+{
+ return fl->c.flc_type == F_RDLCK;
+}
+
+static inline bool lock_is_write(struct file_lock *fl)
+{
+ return fl->c.flc_type == F_WRLCK;
+}
+
+static inline void locks_wake_up(struct file_lock *fl)
+{
+ wake_up(&fl->c.flc_wait);
+}
+
/* fs/locks.c */
void locks_free_lock_context(struct inode *inode);
void locks_free_lock(struct file_lock *fl);
void locks_init_lock(struct file_lock *);
-struct file_lock * locks_alloc_lock(void);
+struct file_lock *locks_alloc_lock(void);
void locks_copy_lock(struct file_lock *, struct file_lock *);
void locks_copy_conflock(struct file_lock *, struct file_lock *);
void locks_remove_posix(struct file *, fl_owner_t);
@@ -165,11 +198,16 @@ int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_l
int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
bool vfs_inode_has_locks(struct inode *inode);
int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
+
+void locks_init_lease(struct file_lease *);
+void locks_free_lease(struct file_lease *fl);
+struct file_lease *locks_alloc_lease(void);
int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
void lease_get_mtime(struct inode *, struct timespec64 *time);
-int generic_setlease(struct file *, int, struct file_lock **, void **priv);
-int vfs_setlease(struct file *, int, struct file_lock **, void **);
-int lease_modify(struct file_lock *, int, struct list_head *);
+int generic_setlease(struct file *, int, struct file_lease **, void **priv);
+int kernel_setlease(struct file *, int, struct file_lease **, void **);
+int vfs_setlease(struct file *, int, struct file_lease **, void **);
+int lease_modify(struct file_lease *, int, struct list_head *);
struct notifier_block;
int lease_register_notifier(struct notifier_block *);
@@ -223,6 +261,25 @@ static inline int fcntl_getlease(struct file *filp)
return F_UNLCK;
}
+static inline bool lock_is_unlock(struct file_lock *fl)
+{
+ return false;
+}
+
+static inline bool lock_is_read(struct file_lock *fl)
+{
+ return false;
+}
+
+static inline bool lock_is_write(struct file_lock *fl)
+{
+ return false;
+}
+
+static inline void locks_wake_up(struct file_lock *fl)
+{
+}
+
static inline void
locks_free_lock_context(struct inode *inode)
{
@@ -233,6 +290,11 @@ static inline void locks_init_lock(struct file_lock *fl)
return;
}
+static inline void locks_init_lease(struct file_lease *fl)
+{
+ return;
+}
+
static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
{
return;
@@ -307,18 +369,24 @@ static inline void lease_get_mtime(struct inode *inode,
}
static inline int generic_setlease(struct file *filp, int arg,
- struct file_lock **flp, void **priv)
+ struct file_lease **flp, void **priv)
+{
+ return -EINVAL;
+}
+
+static inline int kernel_setlease(struct file *filp, int arg,
+ struct file_lease **lease, void **priv)
{
return -EINVAL;
}
static inline int vfs_setlease(struct file *filp, int arg,
- struct file_lock **lease, void **priv)
+ struct file_lease **lease, void **priv)
{
return -EINVAL;
}
-static inline int lease_modify(struct file_lock *fl, int arg,
+static inline int lease_modify(struct file_lease *fl, int arg,
struct list_head *dispose)
{
return -EINVAL;
@@ -341,6 +409,9 @@ locks_inode_context(const struct inode *inode)
#endif /* !CONFIG_FILE_LOCKING */
+/* for walking lists of file_locks linked by fl_list */
+#define for_each_file_lock(_fl, _head) list_for_each_entry(_fl, _head, c.flc_list)
+
static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
{
return locks_lock_inode_wait(file_inode(filp), fl);