diff options
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 6fd561ac98667..3eea0d0be8a0d 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -96,6 +96,51 @@ static void __endio_write_update_ordered(struct btrfs_inode *inode, const bool uptodate); /* + * btrfs_inode_lock - lock inode i_rwsem based on arguments passed + * + * ilock_flags can have the following bit set: + * + * BTRFS_ILOCK_SHARED - acquire a shared lock on the inode + * BTRFS_ILOCK_TRY - try to acquire the lock, if fails on first attempt + * return -EAGAIN + */ +int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags) +{ + if (ilock_flags & BTRFS_ILOCK_SHARED) { + if (ilock_flags & BTRFS_ILOCK_TRY) { + if (!inode_trylock_shared(inode)) + return -EAGAIN; + else + return 0; + } + inode_lock_shared(inode); + } else { + if (ilock_flags & BTRFS_ILOCK_TRY) { + if (!inode_trylock(inode)) + return -EAGAIN; + else + return 0; + } + inode_lock(inode); + } + return 0; +} + +/* + * btrfs_inode_unlock - unock inode i_rwsem + * + * ilock_flags should contain the same bits set as passed to btrfs_inode_lock() + * to decide whether the lock acquired is shared or exclusive. + */ +void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags) +{ + if (ilock_flags & BTRFS_ILOCK_SHARED) + inode_unlock_shared(inode); + else + inode_unlock(inode); +} + +/* * Cleanup all submitted ordered extents in specified range to handle errors * from the btrfs_run_delalloc_range() callback. * |