[RFC v3 0/2] pstore/rom: new support logger for block devices

[liaoweixiong]

Why should we need pstore_rom?
1. Most embedded intelligent equipment have no persistent ram, which
increases costs. We perfer to cheaper solutions, like block devices.
In fast, there is already a sample for block device logger in driver
MTD (drivers/mtd/mtdoops.c).
2. Do not any equipment have battery, which means that it lost all data
on general ram if power failure. Pstore has little to do for these
equipments.

[PATCH v1]
On patch 1:
Core codes of pstore_rom, which works well on allwinner(sunxi) platform.
On patch 2:
A sample for pstore_rom, using general ram rather than block device.

[PATCH v2]
On patch 1:
Fix build as module error for redefinition of 'romz_unregister' and 'romz_register'

[PATCH v3]
On patch 1:
Fix build as module error for undefined 'vfs_read' and 'vfs_write'
Both of 'vfs_read' and 'vfs_write' haven't be exproted yet, so we use 'kernel_read'
and 'kernel_write' instead.

liaoweixiong (2):
  pstore/rom: new support logger for block devices
  pstore/rom: add sample for pstore_rom

 fs/pstore/Kconfig          |  16 +
 fs/pstore/Makefile         |   5 +
 fs/pstore/rombuf.c         |  46 +++
 fs/pstore/romzone.c        | 957 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/pstore_rom.h |  61 +++
 5 files changed, 1085 insertions(+)
 create mode 100644 fs/pstore/rombuf.c
 create mode 100644 fs/pstore/romzone.c
 create mode 100644 include/linux/pstore_rom.h

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1.9.1