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This commit adds an option to set the device block size used to 4K.
By default Squashfs sets the device block size (sb_min_blocksize) to 1K
or the smallest block size supported by the block device (if larger).
This, because blocks are packed together and unaligned in Squashfs,
should reduce latency.
This, however, gives poor performance on MTD NAND devices where
the optimal I/O size is 4K (even though the devices can support
smaller block sizes).
Using a 4K device block size may also improve overall I/O
performance for some file access patterns (e.g. sequential
accesses of files in filesystem order) on all media.
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
There are numerous broken references to Documentation files (in other
Documentation files, in comments, etc.). These broken references are
caused by typo's in the references, and by renames or removals of the
Documentation files. Some broken references are simply odd.
Fix these broken references, sometimes by dropping the irrelevant text
they were part of.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Squashfs now supports XZ and LZO compression in addition to ZLIB.
As such it no longer makes sense to always include ZLIB support.
In particular embedded systems may only use LZO or XZ compression, and
the ability to exclude ZLIB support will reduce kernel size.
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
As pointed out by Geert Uytterhoeven, "default n" is the default,
no reason to specify it.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
Update compression types supported and add some help text for
the LZO Kconfig option.
Also add missing "default n" line and make some trivial whitespace
cleanups too.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
