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author | Namhyung Kim <namhyung@gmail.com> | 2011-05-26 21:06:50 +0200 |
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committer | Jens Axboe <jaxboe@fusionio.com> | 2011-05-26 21:06:50 +0200 |
commit | af46566885a373b0a526932484cd8fef8de7b598 (patch) | |
tree | e95098d113f040f9eb497965b8285d10a6b59ab9 /drivers/char/scc.h | |
parent | 315980c8688c4b06713c1a5fe9d64cdf8ab57a72 (diff) | |
download | kernel_samsung_smdk4412-af46566885a373b0a526932484cd8fef8de7b598.zip kernel_samsung_smdk4412-af46566885a373b0a526932484cd8fef8de7b598.tar.gz kernel_samsung_smdk4412-af46566885a373b0a526932484cd8fef8de7b598.tar.bz2 |
brd: handle on-demand devices correctly
When finding or allocating a ram disk device, brd_probe() did not take
partition numbers into account so that it can result to a different
device. Consider following example (I set CONFIG_BLK_DEV_RAM_COUNT=4
for simplicity) :
$ sudo modprobe brd max_part=15
$ ls -l /dev/ram*
brw-rw---- 1 root disk 1, 0 2011-05-25 15:41 /dev/ram0
brw-rw---- 1 root disk 1, 16 2011-05-25 15:41 /dev/ram1
brw-rw---- 1 root disk 1, 32 2011-05-25 15:41 /dev/ram2
brw-rw---- 1 root disk 1, 48 2011-05-25 15:41 /dev/ram3
$ sudo mknod /dev/ram4 b 1 64
$ sudo dd if=/dev/zero of=/dev/ram4 bs=4k count=256
256+0 records in
256+0 records out
1048576 bytes (1.0 MB) copied, 0.00215578 s, 486 MB/s
namhyung@leonhard:linux$ ls -l /dev/ram*
brw-rw---- 1 root disk 1, 0 2011-05-25 15:41 /dev/ram0
brw-rw---- 1 root disk 1, 16 2011-05-25 15:41 /dev/ram1
brw-rw---- 1 root disk 1, 32 2011-05-25 15:41 /dev/ram2
brw-rw---- 1 root disk 1, 48 2011-05-25 15:41 /dev/ram3
brw-r--r-- 1 root root 1, 64 2011-05-25 15:45 /dev/ram4
brw-rw---- 1 root disk 1, 1024 2011-05-25 15:44 /dev/ram64
After this patch, /dev/ram4 - instead of /dev/ram64 - was
accessed correctly.
In addition, 'range' passed to blk_register_region() should
include all range of dev_t that RAMDISK_MAJOR can address.
It does not need to be limited by partition numbers unless
'rd_nr' param was specified.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Laurent Vivier <Laurent.Vivier@bull.net>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/char/scc.h')
0 files changed, 0 insertions, 0 deletions