summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/lzo.c
Commit message (Collapse)AuthorAgeFilesLines
* btrfs: constify structs with op functions or static definitionsDavid Sterba2015-02-161-1/+1
| | | | | | | There are some op tables that can be easily made const, similarly the sysfs feature and raid tables. This is motivated by PaX CONSTIFY plugin. Signed-off-by: David Sterba <dsterba@suse.cz>
* btrfs: zero out left over bytes after processing compression streamsChris Mason2014-11-301-0/+15
| | | | | | | | | | | | | Don Bailey noticed that our page zeroing for compression at end-io time isn't complete. This reworks a patch from Linus to push the zeroing into the zlib and lzo specific functions instead of trying to handle the corners inside btrfs_decompress_buf2page Signed-off-by: Chris Mason <clm@fb.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Reported-by: Don A. Bailey <donb@securitymouse.com> cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* btrfs: use DIV_ROUND_UP instead of open-coded variantsDavid Sterba2014-09-171-2/+1
| | | | | | | | | | | | | | | | The form (value + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT is equivalent to (value + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE The rest is a simple subsitution, no difference in the generated assembly code. Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
* btrfs: return errno instead of -1 from compressionZach Brown2014-06-091-7/+7
| | | | | | | | | | | | | | | | The compression layer seems to have been built to return -1 and have callers make up errors that make sense. This isn't great because there are different errors that originate down in the compression layer. Let's return real negative errnos from the compression layer so that callers can pass on the error without having to guess what happened. ENOMEM for allocation failure, E2BIG when compression exceeds the uncompressed input, and EIO for everything else. This helps a future path return errors from btrfs_decompress(). Signed-off-by: Zach Brown <zab@redhat.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: convert printk to btrfs_ and fix BTRFS prefixFrank Holton2014-01-281-3/+3
| | | | | | | | | | Convert all applicable cases of printk and pr_* to the btrfs_* macros. Fix all uses of the BTRFS prefix. Signed-off-by: Frank Holton <fholton@gmail.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: return -1 when lzo compression makes data biggerStefan Agner2013-09-011-1/+3
| | | | | | | | | | | | | With this fix the lzo code behaves like the zlib code by returning an error code when compression does not help reduce the size of the file. This is currently not a bug since the compressed size is checked again in the calling method compress_file_range. Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: fix the code comments for LZO compression workspaceJie Liu2013-07-011-2/+2
| | | | | | | | | Fix the code comments for lzo compression workspace. The buf item is used to store the decompressed data and cbuf is used to store the compressed data. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* btrfs: remove the second argument of k[un]map_atomic()Cong Wang2012-03-201-2/+2
| | | | Signed-off-by: Cong Wang <amwang@redhat.com>
* Btrfs: Avoid accessing unmapped kernel addressLi Zefan2011-02-161-7/+14
| | | | | | | | | | | | | | When decompressing a chunk of data, we'll copy the data out to a working buffer if the data is stored in more than one page, otherwise we'll use the mapped page directly to avoid memory copy. In the latter case, we'll end up accessing the kernel address after we've unmapped the page in a corner case. Reported-by: Juan Francisco Cantero Hurtado <iam@juanfra.info> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* btrfs: Extract duplicate decompress codeLi Zefan2010-12-221-95/+6
| | | | | | | Add a common function to copy decompressed data from working buffer to bio pages. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
* btrfs: Add lzo compression supportLi Zefan2010-12-221-0/+509
Lzo is a much faster compression algorithm than gzib, so would allow more users to enable transparent compression, and some users can choose from compression ratio and speed for different applications Usage: # mount -t btrfs -o compress[=<zlib,lzo>] dev /mnt or # mount -t btrfs -o compress-force[=<zlib,lzo>] dev /mnt "-o compress" without argument is still allowed for compatability. Compatibility: If we mount a filesystem with lzo compression, it will not be able be mounted in old kernels. One reason is, otherwise btrfs will directly dump compressed data, which sits in inline extent, to user. Performance: The test copied a linux source tarball (~400M) from an ext4 partition to the btrfs partition, and then extracted it. (time in second) lzo zlib nocompress copy: 10.6 21.7 14.9 extract: 70.1 94.4 66.6 (data size in MB) lzo zlib nocompress copy: 185.87 108.69 394.49 extract: 193.80 132.36 381.21 Changelog: v1 -> v2: - Select LZO_COMPRESS and LZO_DECOMPRESS in btrfs Kconfig. - Add incompability flag. - Fix error handling in compress code. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
OpenPOWER on IntegriCloud