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2.6.32内核装载vmem_disk出现的问题解决 #3

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
这边错误问题都可以在如下找到解决方法：
《linux设备驱动程序》（ldd3）中的实例程序是在linux-2.6.10版��
�内核中开发的，我的linux内核版本是linux-2.6.32.16，许多函数��
�结构都相对2.6.10发生了变化，所以必须自己对源码进行修改�
��从oreilly官网download示例代码，进入sbul文件夹，开始第一次ma
ke：结果如下：

root@ubuntu:/home/shevarey/ssdd/sbull# make
make -C /lib/modules/2.6.32.16/build M=/home/shevarey/ssdd/sbull modules
make[1]: Entering directory `/usr/src/linux-2.6.32.16'
scripts/Makefile.build:49: *** CFLAGS was changed in 
"/home/shevarey/ssdd/sbull/Makefile". Fix it to use EXTRA_CFLAGS. Stop.
make[1]: *** [_module_/home/shevarey/ssdd/sbull] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.32.16'
make: *** [default] Error 2

告诉我们用EXTRA_CFLAGS替代CFLAGS，打开Makefile，修改。再次make��
�

root@ubuntu:/home/shevarey/ssdd/sbull# make
make -C /lib/modules/2.6.32.16/build M=/home/shevarey/ssdd/sbull modules
make[1]: Entering directory `/usr/src/linux-2.6.32.16'
CC [M] /home/shevarey/ssdd/sbull/sbull.o
/home/shevarey/ssdd/sbull/sbull.c:5:26: error: linux/config.h: No such file or 
directory
/home/shevarey/ssdd/sbull/sbull.c:104: error: expected ')'before '*' token
/home/shevarey/ssdd/sbull/sbull.c: In function sbull_xfer_bio  

/home/shevarey/ssdd/sbull/sbull.c:138: error: implicit declaration of function 
bio_cur_sectors鈥?/home/shevarey/ssdd/sbull/sbull.c: In function 
sbull_xfer_request 
/home/shevarey/ssdd/sbull/sbull.c:154: error: implicit declaration of function 
rq_for_each_bio鈥?/home/shevarey/ssdd/sbull/sbull.c:154: error: expected ')' 
before '*'token
/home/shevarey/ssdd/sbull/sbull.c:152: warning: unused variable 
nrsect鈥?/home/shevarey/ssdd/sbull/sbull.c:159: warning: no return statement 
in function returning non-void
/home/shevarey/ssdd/sbull/sbull.c: At top level:
/home/shevarey/ssdd/sbull/sbull.c:166: error: expected ')'before '*' token
/home/shevarey/ssdd/sbull/sbull.c:191: error: expected ')'before '*' token
/home/shevarey/ssdd/sbull/sbull.c:316: warning: initialization from 
incompatible pointer type
/home/shevarey/ssdd/sbull/sbull.c:317: warning: initialization from 
incompatible pointer type
/home/shevarey/ssdd/sbull/sbull.c:321: warning: initialization from 
incompatible pointer type
/home/shevarey/ssdd/sbull/sbull.c: In function setup_device
/home/shevarey/ssdd/sbull/sbull.c:357: error: sbull_make_request undeclared 
(first use in this function)
/home/shevarey/ssdd/sbull/sbull.c:357: error: (Each undeclared identifier is 
reported only once
/home/shevarey/ssdd/sbull/sbull.c:357: error: for each function it appears in.)
/home/shevarey/ssdd/sbull/sbull.c:361: error: sbull_full_request undeclared 
(first use in this function)
/home/shevarey/ssdd/sbull/sbull.c:371: error: sbull_request undeclared (first 
use in this function)
/home/shevarey/ssdd/sbull/sbull.c:376: error: implicit declaration of function 
blk_queue_hardsect_size make[2]: *** [/home/shevarey/ssdd/sbull/sbull.o] Error 1
make[1]: *** [_module_/home/shevarey/ssdd/sbull] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.32.16'
make: *** [default] Error 2

1.删除#include<linux/config>;

2.对于三处expected ')'before '*' 
token这个貌似语法错误的报错困扰了我很久，观察这三处错误
，这三个函数都使用了request_queue_t*这个参数，对照2.6.10和2.6.
32的源码发现，在2.6.32中取消了typedef struct request_queue 
request_queue_t这个结构定义。那就自己在sbull.c源码中加入这一�
��。

3.bio_cur_sectors不存在，在2.6.10源码中发现这个宏的定义是#defin
e bio_cur_sectors(bio) 
(bio_iovec(bio)->bv_len>>9)，在2.6.32中已经删除该宏，函数bio_cur_byt
es返回bio_iovec(bio)->bv_len，所以将其改为bio_cur_bytes(bio)>>9；

4.rq_for_each_bio未定义，发现改成了__rq_for_each_bio，修改之~；

此时这些错误已经修改完毕，重新make：

root@ubuntu:/home/shevarey/ssdd/sbull# make
make -C /lib/modules/2.6.32.16/build M=/home/shevarey/ssdd/sbull modules
make[1]: Entering directory `/usr/src/linux-2.6.32.16'
CC [M] /home/shevarey/ssdd/sbull/sbull.o
/home/shevarey/ssdd/sbull/sbull.c: In function sbull_request 
/home/shevarey/ssdd/sbull/sbull.c:109: error: implicit declaration of function 
elv_next_request

/home/shevarey/ssdd/sbull/sbull.c:109: warning: assignment makes pointer from 
integer without a cast
/home/shevarey/ssdd/sbull/sbull.c:113: error: implicit declaration of function 
end_request

/home/shevarey/ssdd/sbull/sbull.c:120: error: struct request has no member 
named sector

/home/shevarey/ssdd/sbull/sbull.c:120: error: struct request has no member 
named current_nr_sectors

/home/shevarey/ssdd/sbull/sbull.c: In function sbull_full_request

/home/shevarey/ssdd/sbull/sbull.c:173: warning: assignment makes pointer from 
integer without a cast
/home/shevarey/ssdd/sbull/sbull.c:180: error: implicit declaration of function 
end_that_request_first ?/home/shevarey/ssdd/sbull/sbull.c:181: error: implicit 
declaration of function

blkdev_dequeue_request

/home/shevarey/ssdd/sbull/sbull.c:182: error: implicit declaration of function 
鈥榚nd_that_request_last鈥?/home/shevarey/ssdd/sbull/sbull.c: In function 
sbull_make_request /home/shevarey/ssdd/sbull/sbull.c:198: error: too many 
arguments to function io_endio

/home/shevarey/ssdd/sbull/sbull.c: At top level:
/home/shevarey/ssdd/sbull/sbull.c:317: warning: initialization from 
incompatible pointer type
/home/shevarey/ssdd/sbull/sbull.c:318: warning: initialization from 
incompatible pointer type
/home/shevarey/ssdd/sbull/sbull.c:322: warning: initialization from 
incompatible pointer type
/home/shevarey/ssdd/sbull/sbull.c: In function setup_devices

/home/shevarey/ssdd/sbull/sbull.c:377: error: implicit declaration of function 
blk_queue_hardsect_size

make[2]: *** [/home/shevarey/ssdd/sbull/sbull.o] Error 1
make[1]: *** [_module_/home/shevarey/ssdd/sbull] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.32.16'
make: *** [default] Error 2

1.elv_next_request不存在，改成了blk_fetch_request,有两处，改之~

2.end_request，改成了blk_end_request_all,改之~

3.现在不能直接获取request结构的sector和current_nr_sector；而是通
过函数blk_rq_pos和blk_rq_cur_sectors获得，所以将对用两处改为：

sbull_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req), req->buffer, 
rq_data_dir(req));

4.end_that_request_first,end_that_request_last,blk_dequeque_request已经不存�
��，被blk_fetch_request,blk_end_request_cur,blk_start_request代替所以要��
�一下修改在sbull_full_request中：

if (!__blk_end_request_cur(req, 0)) {
blk_start_request(req);
blk_fetch_request(q);

5.bio_endio参数过多，发现6.32.16中少了中间那个参数，去掉~

6.blk_queue_hardsect_size未定义，在2.6.10中找到定义，直接修改如�
��：

blk_queue_logical_block_size(dev->queue, hardsect_size);

make之后些许warning，执行insmod，出错了，显示blk_put_queue未定��
�，直接删掉。

Original issue reported on code.google.com by loop...@gmail.com on 12 Jul 2011 at 9:27

GoogleCodeExporter commented 8 years ago 
see: http://code.google.com/p/ldd6410/source/detail?r=262

Original comment by 21cnbao on 28 Mar 2014 at 1:57