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filelock: add some new helper functions
In later patches we're going to embed some common fields into a new structure inside struct file_lock. Smooth the transition by adding some new helper functions, and converting the core file locking code to use them. Signed-off-by: Jeff Layton <jlayton@kernel.org> Link: https://lore.kernel.org/r/20240131-flsplit-v3-4-c6129007ee8d@kernel.org Reviewed-by: NeilBrown <neilb@suse.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
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parent
6021d62c67
commit
75cabec011
18
fs/locks.c
18
fs/locks.c
@ -674,7 +674,7 @@ static void __locks_wake_up_blocks(struct file_lock *blocker)
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if (waiter->fl_lmops && waiter->fl_lmops->lm_notify)
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waiter->fl_lmops->lm_notify(waiter);
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else
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wake_up(&waiter->fl_wait);
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locks_wake_up(waiter);
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/*
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* The setting of fl_blocker to NULL marks the "done"
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@ -841,9 +841,9 @@ locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose)
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static bool locks_conflict(struct file_lock *caller_fl,
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struct file_lock *sys_fl)
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{
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if (sys_fl->fl_type == F_WRLCK)
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if (lock_is_write(sys_fl))
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return true;
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if (caller_fl->fl_type == F_WRLCK)
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if (lock_is_write(caller_fl))
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return true;
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return false;
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}
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@ -874,7 +874,7 @@ static bool posix_test_locks_conflict(struct file_lock *caller_fl,
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struct file_lock *sys_fl)
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{
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/* F_UNLCK checks any locks on the same fd. */
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if (caller_fl->fl_type == F_UNLCK) {
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if (lock_is_unlock(caller_fl)) {
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if (!posix_same_owner(caller_fl, sys_fl))
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return false;
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return locks_overlap(caller_fl, sys_fl);
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@ -1055,7 +1055,7 @@ static int flock_lock_inode(struct inode *inode, struct file_lock *request)
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break;
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}
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if (request->fl_type == F_UNLCK) {
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if (lock_is_unlock(request)) {
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if ((request->fl_flags & FL_EXISTS) && !found)
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error = -ENOENT;
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goto out;
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@ -1107,7 +1107,7 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request,
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ctx = locks_get_lock_context(inode, request->fl_type);
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if (!ctx)
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return (request->fl_type == F_UNLCK) ? 0 : -ENOMEM;
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return lock_is_unlock(request) ? 0 : -ENOMEM;
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/*
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* We may need two file_lock structures for this operation,
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@ -1228,7 +1228,7 @@ retry:
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continue;
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if (fl->fl_start > request->fl_end)
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break;
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if (request->fl_type == F_UNLCK)
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if (lock_is_unlock(request))
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added = true;
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if (fl->fl_start < request->fl_start)
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left = fl;
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@ -1279,7 +1279,7 @@ retry:
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error = 0;
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if (!added) {
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if (request->fl_type == F_UNLCK) {
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if (lock_is_unlock(request)) {
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if (request->fl_flags & FL_EXISTS)
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error = -ENOENT;
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goto out;
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@ -1608,7 +1608,7 @@ void lease_get_mtime(struct inode *inode, struct timespec64 *time)
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spin_lock(&ctx->flc_lock);
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fl = list_first_entry_or_null(&ctx->flc_lease,
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struct file_lock, fl_list);
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if (fl && (fl->fl_type == F_WRLCK))
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if (fl && lock_is_write(fl))
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has_lease = true;
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spin_unlock(&ctx->flc_lock);
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}
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@ -147,6 +147,29 @@ int fcntl_setlk64(unsigned int, struct file *, unsigned int,
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int fcntl_setlease(unsigned int fd, struct file *filp, int arg);
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int fcntl_getlease(struct file *filp);
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static inline bool lock_is_unlock(struct file_lock *fl)
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{
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return fl->fl_type == F_UNLCK;
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}
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static inline bool lock_is_read(struct file_lock *fl)
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{
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return fl->fl_type == F_RDLCK;
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}
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static inline bool lock_is_write(struct file_lock *fl)
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{
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return fl->fl_type == F_WRLCK;
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}
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static inline void locks_wake_up(struct file_lock *fl)
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{
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wake_up(&fl->fl_wait);
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}
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/* for walking lists of file_locks linked by fl_list */
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#define for_each_file_lock(_fl, _head) list_for_each_entry(_fl, _head, fl_list)
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/* fs/locks.c */
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void locks_free_lock_context(struct inode *inode);
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void locks_free_lock(struct file_lock *fl);
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@ -223,6 +246,27 @@ static inline int fcntl_getlease(struct file *filp)
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return F_UNLCK;
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}
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static inline bool lock_is_unlock(struct file_lock *fl)
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{
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return false;
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}
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static inline bool lock_is_read(struct file_lock *fl)
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{
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return false;
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}
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static inline bool lock_is_write(struct file_lock *fl)
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{
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return false;
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}
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static inline void locks_wake_up(struct file_lock *fl)
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{
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}
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#define for_each_file_lock(_fl, _head) while(false)
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static inline void
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locks_free_lock_context(struct inode *inode)
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{
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