kernel.git/fs/btrfs/zlib.c, branch linux-3.17.y

btrfs: use E2BIG instead of EIO if compression does not help

2014-07-03T14:04:13Z

Return codes got updated in 60e1975acb48fc3d74a3422b21dde74c977ac3d5 (btrfs: return errno instead of -1 from compression) lzo wrapper returns E2BIG in this case, do the same for zlib. Signed-off-by: David Sterba

btrfs: return errno instead of -1 from compression

2014-06-10T00:20:21Z

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

2014-01-28T21:20:05Z

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: fix message printing

2012-10-09T13:19:57Z

Fix various messages to include newline and module prefix. Signed-off-by: Daniel J Blueman

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

2012-03-20T13:48:21Z

Signed-off-by: Cong Wang

zlib: slim down zlib_deflate() workspace when possible

2011-03-23T00:44:17Z

Instead of always creating a huge (268K) deflate_workspace with the maximum compression parameters (windowBits=15, memLevel=8), allow the caller to obtain a smaller workspace by specifying smaller parameter values. For example, when capturing oops and panic reports to a medium with limited capacity, such as NVRAM, compression may be the only way to capture the whole report. In this case, a small workspace (24K works fine) is a win, whether you allocate the workspace when you need it (i.e., during an oops or panic) or at boot time. I've verified that this patch works with all accepted values of windowBits (positive and negative), memLevel, and compression level. Signed-off-by: Jim Keniston Cc: Herbert Xu Cc: David Miller Cc: Chris Mason Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

btrfs: Extract duplicate decompress code

2010-12-22T15:15:50Z

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

btrfs: Allow to add new compression algorithm

2010-12-22T15:15:45Z

Make the code aware of compression type, instead of always assuming zlib compression. Also make the zlib workspace function as common code for all compression types. Signed-off-by: Li Zefan

btrfs: Fix error handling in zlib

2010-12-22T15:15:43Z

Return failure if alloc_page() fails to allocate memory, and the upper code will just give up compression. Signed-off-by: Li Zefan

btrfs: Fix bugs in zlib workspace

2010-12-22T15:15:41Z

- Fix a race that can result in alloc_workspace > cpus. - Fix to check num_workspace after wakeup. Signed-off-by: Li Zefan