BMC/Intel-BMC/linux.git/fs/btrfs/lzo.c, branch dev

btrfs: constify structs with op functions or static definitions

2015-02-16T17:48:44+00:00

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

btrfs: zero out left over bytes after processing compression streams

2014-11-30T17:33:51+00:00

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 Reviewed-by: Josef Bacik Reported-by: Don A. Bailey cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds

btrfs: use DIV_ROUND_UP instead of open-coded variants

2014-09-17T20:37:17+00:00

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 Signed-off-by: Chris Mason

btrfs: return errno instead of -1 from compression

2014-06-10T00:20:21+00:00

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 Signed-off-by: Chris Mason

Btrfs: convert printk to btrfs_ and fix BTRFS prefix

2014-01-28T21:20:05+00:00

Convert all applicable cases of printk and pr_* to the btrfs_* macros. Fix all uses of the BTRFS prefix. Signed-off-by: Frank Holton Signed-off-by: Josef Bacik Signed-off-by: Chris Mason

Btrfs: return -1 when lzo compression makes data bigger

2013-09-01T11:57:19+00:00

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 Signed-off-by: Josef Bacik Signed-off-by: Chris Mason

btrfs: fix the code comments for LZO compression workspace

2013-07-01T12:52:26+00:00

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 Signed-off-by: Josef Bacik

btrfs: remove the second argument of k[un]map_atomic()

2012-03-20T13:48:21+00:00

Signed-off-by: Cong Wang

Btrfs: Avoid accessing unmapped kernel address

2011-02-16T20:37:58+00:00

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 Signed-off-by: Li Zefan Signed-off-by: Chris Mason

btrfs: Extract duplicate decompress code

2010-12-22T15:15:50+00:00

Add a common function to copy decompressed data from working buffer to bio pages. Signed-off-by: Li Zefan