diff options
Diffstat (limited to 'fs/reiserfs/lock.c')
| -rw-r--r-- | fs/reiserfs/lock.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/reiserfs/lock.c b/fs/reiserfs/lock.c index cdd8d9e..cb1bba3 100644 --- a/fs/reiserfs/lock.c +++ b/fs/reiserfs/lock.c @@ -50,6 +50,32 @@ void reiserfs_write_unlock(struct super_block *s) } /* + * If we already own the lock, just exit and don't increase the depth. + * Useful when we don't want to lock more than once. + * + * We always return the lock_depth we had before calling + * this function. + */ +int reiserfs_write_lock_once(struct super_block *s) +{ + struct reiserfs_sb_info *sb_i = REISERFS_SB(s); + + if (sb_i->lock_owner != current) { + mutex_lock(&sb_i->lock); + sb_i->lock_owner = current; + return sb_i->lock_depth++; + } + + return sb_i->lock_depth; +} + +void reiserfs_write_unlock_once(struct super_block *s, int lock_depth) +{ + if (lock_depth == -1) + reiserfs_write_unlock(s); +} + +/* * 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() */ |