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OpenCloudOS-Kernel
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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  docbook: add pipes, other fixes
  blktrace: use cpu_clock() instead of sched_clock()
  bsg: Fix build for CONFIG_BLOCK=n
  [patch] QUEUE_FLAG_READFULL QUEUE_FLAG_WRITEFULL comment fix
This commit is contained in:
Linus Torvalds 2007-07-28 19:31:13 -07:00
parent 933a6208d8 79685b8dee
commit 8e8ef2971b
6 changed files with 28 additions and 19 deletions
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13
Documentation/DocBook/kernel-api.tmpl
View File

@ -704,14 +704,23 @@ X!Idrivers/video/console/fonts.c
<chapter id="splice">
<title>splice API</title>
<para>)
<para>
splice is a method for moving blocks of data around inside the
kernel, without continually transferring it between the kernel
kernel, without continually transferring them between the kernel
and user space.
</para>
!Iinclude/linux/splice.h
!Ffs/splice.c
</chapter>
<chapter id="pipes">
<title>pipes API</title>
<para>
Pipe interfaces are all for in-kernel (builtin image) use.
They are not exported for use by modules.
</para>
!Iinclude/linux/pipe_fs_i.h
!Ffs/pipe.c
</chapter>
</book>

4
block/Kconfig
View File

@ -49,8 +49,6 @@ config LSF
If unsure, say Y.
endif # BLOCK
config BLK_DEV_BSG
bool "Block layer SG support v4 (EXPERIMENTAL)"
depends on EXPERIMENTAL
@ -64,4 +62,6 @@ config BLK_DEV_BSG
protocols (e.g. Task Management Functions and SMP in Serial
Attached SCSI).
endif # BLOCK
source block/Kconfig.iosched

20
block/blktrace.c
View File

@ -41,7 +41,7 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action,
const int cpu = smp_processor_id();
t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
t->time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
t->time = cpu_clock(cpu) - per_cpu(blk_trace_cpu_offset, cpu);
t->device = bt->dev;
t->action = action;
t->pid = pid;
@ -159,7 +159,7 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
t->sequence = ++(*sequence);
t->time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
t->time = cpu_clock(cpu) - per_cpu(blk_trace_cpu_offset, cpu);
t->sector = sector;
t->bytes = bytes;
t->action = what;
@ -488,17 +488,17 @@ void blk_trace_shutdown(struct request_queue *q)
}
/*
* Average offset over two calls to sched_clock() with a gettimeofday()
* Average offset over two calls to cpu_clock() with a gettimeofday()
* in the middle
*/
static void blk_check_time(unsigned long long *t)
static void blk_check_time(unsigned long long *t, int this_cpu)
{
unsigned long long a, b;
struct timeval tv;
a = sched_clock();
a = cpu_clock(this_cpu);
do_gettimeofday(&tv);
b = sched_clock();
b = cpu_clock(this_cpu);
*t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
*t -= (a + b) / 2;
@ -510,16 +510,16 @@ static void blk_check_time(unsigned long long *t)
static void blk_trace_check_cpu_time(void *data)
{
unsigned long long *t;
int cpu = get_cpu();
int this_cpu = get_cpu();
t = &per_cpu(blk_trace_cpu_offset, cpu);
t = &per_cpu(blk_trace_cpu_offset, this_cpu);
/*
* Just call it twice, hopefully the second call will be cache hot
* and a little more precise
*/
blk_check_time(t);
blk_check_time(t);
blk_check_time(t, this_cpu);
blk_check_time(t, this_cpu);
put_cpu();
}

2
fs/pipe.c
View File

@ -255,7 +255,7 @@ void generic_pipe_buf_get(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
/**
* generic_pipe_buf_confirm - verify contents of the pipe buffer
* @pipe: the pipe that the buffer belongs to
* @info: the pipe that the buffer belongs to
* @buf: the buffer to confirm
*
* Description:

4
fs/splice.c
View File

@ -164,7 +164,7 @@ static const struct pipe_buf_operations user_page_pipe_buf_ops = {
* @spd: data to fill
*
* Description:
* @spd contains a map of pages and len/offset tupples, a long with
* @spd contains a map of pages and len/offset tuples, along with
* the struct pipe_buf_operations associated with these pages. This
* function will link that data to the pipe.
*
@ -1000,7 +1000,7 @@ static long do_splice_to(struct file *in, loff_t *ppos,
* Description:
* This is a special case helper to splice directly between two
* points, without requiring an explicit pipe. Internally an allocated
* pipe is cached in the process, and reused during the life time of
* pipe is cached in the process, and reused during the lifetime of
* that process.
*
*/

4
include/linux/blkdev.h
View File

@ -483,8 +483,8 @@ struct request_queue
#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
#define QUEUE_FLAG_READFULL 3 /* write queue has been filled */
#define QUEUE_FLAG_WRITEFULL 4 /* read queue has been filled */
#define QUEUE_FLAG_READFULL 3 /* read queue has been filled */
#define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */
#define QUEUE_FLAG_DEAD 5 /* queue being torn down */
#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */
#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */