u-boot.git/disk/part.c, branch v2016.05

dm: part: fix missing driver name in debug print

2016-04-14T17:51:39+00:00

Fixes the following warning with PART_DEBUG enabled:
disk/part.c: In function ‘get_partition_info’:
disk/part.c:372:3: warning: format ‘%s’ expects a matching ‘char *’ argument [-Wformat]

Signed-off-by: Nishanth Menon

drivers: block: add block device cache

2016-04-01T21:18:27+00:00

Add a block device cache to speed up repeated reads of block devices by
various filesystems.

This small amount of cache can dramatically speed up filesystem
operations by skipping repeated reads of common areas of a block
device (typically directory structures).

This has shown to have some benefit on FAT filesystem operations of
loading a kernel and RAM disk, but more dramatic benefits on ext4
filesystems when the kernel and/or RAM disk are spread across
multiple extent header structures as described in commit fc0fc50.

The cache is implemented through a minimal list (block_cache) maintained
in most-recently-used order and count of the current number of entries
(cache_count). It uses a maximum block count setting to prevent copies
of large block reads and an upper bound on the number of cached areas.

The maximum number of entries in the cache defaults to 32 and the maximum
number of blocks per cache entry has a default of 2, which has shown to
produce the best results on testing of ext4 and FAT filesystems.

The 'blkcache' command (enabled through CONFIG_CMD_BLOCK_CACHE) allows
changing these values and can be used to tune for a particular filesystem
layout.

Signed-off-by: Eric Nelson

disk/part.c: Expose list of available block drivers

2016-03-15T19:19:22+00:00

We have a pretty nice and generic interface to ask for a specific block
device. However, that one is still based around the magic notion that
we know the driver name.

In order to be able to write fully generic disk access code, expose the
currently internal list to other source files so that they can scan through
all available block drivers.

Signed-off-by: Alexander Graf 
Reviewed-by: Simon Glass 
Tested-by: Simon Glass

dm: block: Rename device number member dev to devnum

2016-03-14T21:34:50+00:00

This is a device number, and we want to use 'dev' to mean a driver model
device. Rename the member.

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng 
Tested-by: Stephen Warren

dm: part: Rename some partition functions

2016-03-14T21:34:50+00:00

Rename three partition functions so that they start with part_. This makes
it clear what they relate to.

Signed-off-by: Simon Glass 
Tested-by: Stephen Warren

dm: part: Convert partition API use to linker lists

2016-03-14T21:34:50+00:00

We can use linker lists instead of explicitly declaring each function.
This makes the code shorter by avoiding switch() statements and lots of
header file declarations.

While this does clean up the code it introduces a few code issues with SPL.
SPL never needs to print partition information since this all happens from
commands. SPL mostly doesn't need to obtain information about a partition
either, except in a few cases. Add these cases so that the code will be
dropped from each partition driver when not needed. This avoids code bloat.

I think this is still a win, since it is not a bad thing to be explicit
about which features are used in SPL. But others may like to weigh in.

Signed-off-by: Simon Glass 
Reviewed-by: Tom Rini 
Tested-by: Stephen Warren

dm: blk: Rename get_device_and_partition()

2016-03-14T21:34:50+00:00

Rename this function to blk_get_device_part_str(). This is a better name
because it makes it clear that the function returns a block device and
parses a string.

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng 
Tested-by: Stephen Warren

dm: blk: Rename get_device() to blk_get_device_by_str()

2016-03-14T21:34:50+00:00

The current name is too generic. The function returns a block device based
on a provided string. Rename it to aid searching and make its purpose
clearer. Also add a few comments.

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng 
Tested-by: Stephen Warren

dm: blk: Rename get_dev() to blk_get_dev()

2016-03-14T21:34:50+00:00

The current name is too generic. Add a 'blk_' prefix to aid searching and
make its purpose clearer.

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng 
Tested-by: Stephen Warren

dm: Drop the block_dev_desc_t typedef

2016-03-14T21:34:50+00:00

Use 'struct' instead of a typdef. Also since 'struct block_dev_desc' is long
and causes 80-column violations, rename it to struct blk_desc.

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng 
Tested-by: Stephen Warren