linux.git/fs/squashfs, branch v4.0

Squashfs: Add LZ4 compression configuration option

2014-11-27T18:48:44+00:00

Add the glue code, and also update the documentation.

Signed-off-by: Phillip Lougher

Squashfs: add LZ4 compression support

2014-11-27T07:44:11+00:00

Add support for reading file systems compressed with the
LZ4 compression algorithm.

This patch adds the LZ4 decompressor wrapper code.

Signed-off-by: Phillip Lougher

fs/squashfs/super.c: logging cleanup

2014-08-07T01:01:13+00:00

- Convert printk to pr_foo()
- Add pr_fmt for future logging entries
- Coalesce formats

Signed-off-by: Fabian Frederick 
Cc: Phillip Lougher 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/squashfs/file_direct.c: replace count*size kmalloc by kmalloc_array

2014-08-07T01:01:13+00:00

kmalloc_array() manages count*sizeof overflow.

Signed-off-by: Fabian Frederick 
Cc: Phillip Lougher 
Cc: Joe Perches 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/squashfs/squashfs.h: replace pr_warning by pr_warn

2014-06-04T23:53:52+00:00

Update the last pr_warning callsite in fs branch

Signed-off-by: Fabian Frederick 
Cc: Phillip Lougher 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs: push sync_filesystem() down to the file system's remount_fs()

2014-03-13T14:14:33+00:00

Previously, the no-op "mount -o mount /dev/xxx" operation when the
file system is already mounted read-write causes an implied,
unconditional syncfs().  This seems pretty stupid, and it's certainly
documented or guaraunteed to do this, nor is it particularly useful,
except in the case where the file system was mounted rw and is getting
remounted read-only.

However, it's possible that there might be some file systems that are
actually depending on this behavior.  In most file systems, it's
probably fine to only call sync_filesystem() when transitioning from
read-write to read-only, and there are some file systems where this is
not needed at all (for example, for a pseudo-filesystem or something
like romfs).

Signed-off-by: "Theodore Ts'o" 
Cc: linux-fsdevel@vger.kernel.org
Cc: Christoph Hellwig 
Cc: Artem Bityutskiy 
Cc: Adrian Hunter 
Cc: Evgeniy Dushistov 
Cc: Jan Kara 
Cc: OGAWA Hirofumi 
Cc: Anders Larsen 
Cc: Phillip Lougher 
Cc: Kees Cook 
Cc: Mikulas Patocka 
Cc: Petr Vandrovec 
Cc: xfs@oss.sgi.com
Cc: linux-btrfs@vger.kernel.org
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Cc: codalist@coda.cs.cmu.edu
Cc: linux-ext4@vger.kernel.org
Cc: linux-f2fs-devel@lists.sourceforge.net
Cc: fuse-devel@lists.sourceforge.net
Cc: cluster-devel@redhat.com
Cc: linux-mtd@lists.infradead.org
Cc: jfs-discussion@lists.sourceforge.net
Cc: linux-nfs@vger.kernel.org
Cc: linux-nilfs@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
Cc: ocfs2-devel@oss.oracle.com
Cc: reiserfs-devel@vger.kernel.org

Squashfs: fix failure to unlock pages on decompress error

2013-11-24T01:02:50+00:00

Direct decompression into the page cache.  If we fall back
to using an intermediate buffer (because we cannot grab all the
page cache pages) and we get a decompress fail, we forgot to
release the pages.

Reported-by: Roman Peniaev 
Signed-off-by: Phillip Lougher

Squashfs: Check stream is not NULL in decompressor_multi.c

2013-11-20T03:59:20+00:00

Fix static checker complaint that stream is not checked in
squashfs_decompressor_destroy().

Reported-by: Dan Carpenter 
Signed-off-by: Phillip Lougher 
Reviewed-by: Minchan Kim

Squashfs: Directly decompress into the page cache for file data

2013-11-20T03:59:13+00:00

This introduces an implementation of squashfs_readpage_block()
that directly decompresses into the page cache.

This uses the previously added page handler abstraction to push
down the necessary kmap_atomic/kunmap_atomic operations on the
page cache buffers into the decompressors.  This enables
direct copying into the page cache without using the slow
kmap/kunmap calls.

The code detects when multiple threads are racing in
squashfs_readpage() to decompress the same block, and avoids
this regression by falling back to using an intermediate
buffer.

This patch enhances the performance of Squashfs significantly
when multiple processes are accessing the filesystem simultaneously
because it not only reduces memcopying, but it more importantly
eliminates the lock contention on the intermediate buffer.

Using single-thread decompression.

        dd if=file1 of=/dev/null bs=4096 &
        dd if=file2 of=/dev/null bs=4096 &
        dd if=file3 of=/dev/null bs=4096 &
        dd if=file4 of=/dev/null bs=4096

Before:

629145600 bytes (629 MB) copied, 45.8046 s, 13.7 MB/s

After:

629145600 bytes (629 MB) copied, 9.29414 s, 67.7 MB/s

Signed-off-by: Phillip Lougher 
Reviewed-by: Minchan Kim

Squashfs: Restructure squashfs_readpage()

2013-11-20T03:59:07+00:00

Restructure squashfs_readpage() splitting it into separate
functions for datablocks, fragments and sparse blocks.

Move the memcpying (from squashfs cache entry) implementation of
squashfs_readpage_block into file_cache.c

This allows different implementations to be supported.

Signed-off-by: Phillip Lougher 
Reviewed-by: Minchan Kim