linux-toradex.git/fs/btrfs/zlib.c, branch v5.0

btrfs: replace GPL boilerplate by SPDX -- sources

2018-04-12T14:29:51+00:00

Remove GPL boilerplate text (long, short, one-line) and keep the rest,
ie. personal, company or original source copyright statements. Add the
SPDX header.

Signed-off-by: David Sterba

btrfs: allow to set compression level for zlib

2017-11-01T19:45:29+00:00

Preliminary support for setting compression level for zlib, the
following works:

$ mount -o compess=zlib                 # default
$ mount -o compess=zlib0                # same
$ mount -o compess=zlib9                # level 9, slower sync, less data
$ mount -o compess=zlib1                # level 1, faster sync, more data
$ mount -o remount,compress=zlib3	# level set by remount

The compress-force works the same as compress'.  The level is visible in
the same format in /proc/mounts. Level set via file property does not
work yet.

Required patch: "btrfs: prepare for extensions in compression options"

Signed-off-by: David Sterba

btrfs: switch to kvmalloc and GFP_KERNEL in lzo/zlib alloc_workspace

2017-06-19T16:26:02+00:00

The compression workspace buffers are larger than a page so we use
vmalloc, unconditionally. This is not always necessary as there might be
contiguous memory available.

Let's use the kvmalloc helpers that will try kmalloc first and fallback
to vmalloc. For that they require GFP_KERNEL flags. As we now have the
alloc_workspace calls protected by memalloc_nofs in the critical
contexts, we can safely use GFP_KERNEL.

Signed-off-by: David Sterba

btrfs: switch kmallocs to GFP_KERNEL in lzo/zlib alloc_workspace

2017-06-19T16:26:02+00:00

As alloc_workspace is now protected by memalloc_nofs where needed,
we can switch the kmalloc to use GFP_KERNEL.

Reviewed-by: Anand Jain 
Signed-off-by: David Sterba

btrfs: reduce arguments for decompress_bio ops

2017-06-19T16:26:00+00:00

struct compressed_bio pointer can be used instead.

Signed-off-by: Anand Jain 
Reviewed-by: Nikolay Borisov 
Signed-off-by: David Sterba

btrfs: derive maximum output size in the compression implementation

2017-02-28T13:26:36+00:00

The value of max_out can be calculated from the parameters passed to the
compressors, which is number of pages and the page size, and we don't
have to needlessly pass it around.

Signed-off-by: David Sterba

btrfs: merge nr_pages input and output parameter in compress_pages

2017-02-28T13:26:35+00:00

The parameter saying how many pages can be allocated at maximum can be
merged with the output page counter, to save some stack space.  The
compression implementation will sink the parameter to a local variable
so everything works as before.

The nr_pages variables can also be simply merged in compress_file_range
into one.

Signed-off-by: David Sterba

btrfs: merge length input and output parameter in compress_pages

2017-02-28T13:26:35+00:00

The length parameter is basically duplicated for input and output in the
top level caller of the compress_pages chain. We can simply use one
variable for that and reduce stack consumption. The compression
implementation will sink the parameter to a local variable so everything
works as before.

Signed-off-by: David Sterba

btrfs: use bio iterators for the decompression handlers

2016-11-30T12:45:19+00:00

Pass the full bio to the decompression routines and use bio iterators
to iterate over the data in the bio.

Signed-off-by: Christoph Hellwig 
Signed-off-by: David Sterba

btrfs: Call kunmap if zlib_inflateInit2 fails

2016-11-30T12:45:18+00:00

If zlib_inflateInit2 fails, the input page is never unmapped.
Add a call to kunmap when it fails.

Signed-off-by: Nick Terrell 
Reviewed-by: David Sterba 
Signed-off-by: David Sterba