search for: destoff

...>i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); + } else { + mutex_lock(&inode->i_mutex); } /* determine range to clone */ @@ -2302,6 +2300,13 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, !IS_ALIGNED(destoff, bs)) goto out_unlock; + /* + * allow ranges within the same file to be cloned only if + * they don''t overlap + */ + if (src == inode && !(off + len <= destoff || destoff + len <= off)) + goto out_unlock; + if (destoff > inode->i_size) { ret = btrfs_cont_e...

Hi, The following series of patches implements in btrfs an ioctl to do out-of-band deduplication of file extents. To be clear, this means that the file system is mounted and running, but the dedupe is not done during file writes, but after the fact when some userspace software initiates a dedupe. The primary patch is loosely based off of one sent by Josef Bacik back in January, 2011.

This series adds an initial implementation for scrub. It works quite straightforward. The usermode issues an ioctl for each device in the fs. For each device, it enumerates the allocated device chunks. For each chunk, the contained extents are enumerated and the data checksums fetched. The extents are read sequentially and the checksums verified. If an error occurs (checksum or EIO), a good copy