diff options
| -rw-r--r-- | fs/cifs/file.c | 56 |
1 files changed, 52 insertions, 4 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 460d87b7cda0..0a11dbbbb131 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -671,6 +671,21 @@ cifs_del_lock_waiters(struct cifsLockInfo *lock) } } +/* + * Copied from fs/locks.c with small changes. + * Remove waiter from blocker's block list. + * When blocker ends up pointing to itself then the list is empty. + */ +static void +cifs_locks_delete_block(struct file_lock *waiter) +{ + lock_flocks(); + list_del_init(&waiter->fl_block); + list_del_init(&waiter->fl_link); + waiter->fl_next = NULL; + unlock_flocks(); +} + static bool __cifs_find_lock_conflict(struct cifsInodeInfo *cinode, __u64 offset, __u64 length, __u8 type, __u16 netfid, @@ -820,6 +835,39 @@ cifs_posix_lock_test(struct file *file, struct file_lock *flock) return rc; } +/* Called with locked lock_mutex, return with unlocked. */ +static int +cifs_posix_lock_file_wait_locked(struct file *file, struct file_lock *flock) +{ + struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); + int rc; + + while (true) { + rc = posix_lock_file(file, flock, NULL); + mutex_unlock(&cinode->lock_mutex); + if (rc != FILE_LOCK_DEFERRED) + break; + rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); + if (!rc) { + mutex_lock(&cinode->lock_mutex); + continue; + } + cifs_locks_delete_block(flock); + break; + } + return rc; +} + +static int +cifs_posix_lock_file_wait(struct file *file, struct file_lock *flock) +{ + struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); + + mutex_lock(&cinode->lock_mutex); + /* lock_mutex will be released by the function below */ + return cifs_posix_lock_file_wait_locked(file, flock); +} + /* * Set the byte-range lock (posix style). Returns: * 1) 0, if we set the lock and don't need to request to the server; @@ -840,9 +888,9 @@ cifs_posix_lock_set(struct file *file, struct file_lock *flock) mutex_unlock(&cinode->lock_mutex); return rc; } - rc = posix_lock_file_wait(file, flock); - mutex_unlock(&cinode->lock_mutex); - return rc; + + /* lock_mutex will be released by the function below */ + return cifs_posix_lock_file_wait_locked(file, flock); } static int @@ -1338,7 +1386,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u8 type, out: if (flock->fl_flags & FL_POSIX) - posix_lock_file_wait(file, flock); + cifs_posix_lock_file_wait(file, flock); return rc; } |