linux/fs/reiserfs/lock.c

// SPDX-License-Identifier: GPL-2.0
#include "reiserfs.h"
#include <linux/mutex.h>

/*
 * The previous reiserfs locking scheme was heavily based on
 * the tricky properties of the Bkl:
 *
 * - it was acquired recursively by a same task
 * - the performances relied on the release-while-schedule() property
 *
 * Now that we replace it by a mutex, we still want to keep the same
 * recursive property to avoid big changes in the code structure.
 * We use our own lock_owner here because the owner field on a mutex
 * is only available in SMP or mutex debugging, also we only need this field
 * for this mutex, no need for a system wide mutex facility.
 *
 * Also this lock is often released before a call that could block because
 * reiserfs performances were partially based on the release while schedule()
 * property of the Bkl.
 */
void reiserfs_write_lock(struct super_block *s)
{ … }

void reiserfs_write_unlock(struct super_block *s)
{ … }

int __must_check reiserfs_write_unlock_nested(struct super_block *s)
{ … }

void reiserfs_write_lock_nested(struct super_block *s, int depth)
{ … }

/*
 * Utility function to force a BUG if it is called without the superblock
 * write lock held.  caller is the string printed just before calling BUG()
 */
void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
{ … }

#ifdef CONFIG_REISERFS_CHECK
void reiserfs_lock_check_recursive(struct super_block *sb)
{ … }
#endif