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[PATCH] introduce a "kernel-internal pipe object" abstraction

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separate out the 'internal pipe object' abstraction, and make it
usable to splice. This cleans up and fixes several aspects of the
internal splice APIs and the pipe code:

 - pipes: the allocation and freeing of pipe_inode_info is now more symmetric
   and more streamlined with existing kernel practices.

 - splice: small micro-optimization: less pointer dereferencing in splice
   methods

Signed-off-by: Ingo Molnar <[email protected]>

Update XFS for the ->splice_read/->splice_write changes.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ingo Molnar 2006-04-10 15:18:35 +02:00 • committed by Jens Axboe
commit 3a326a2ce8
9 changed files with 114 additions and 106 deletions
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12
fs/fifo.c
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@ -15,12 +15,13 @@
#include <linux/fs.h>
#include <linux/pipe_fs_i.h>
static void wait_for_partner(struct inode* inode, unsigned int* cnt)
static void wait_for_partner(struct inode* inode, unsigned int *cnt)
{
int cur = *cnt;
while(cur == *cnt) {
pipe_wait(inode);
if(signal_pending(current))
while (cur == *cnt) {
pipe_wait(inode->i_pipe);
if (signal_pending(current))
break;
}
}
@ -37,7 +38,8 @@ static int fifo_open(struct inode *inode, struct file *filp)
mutex_lock(PIPE_MUTEX(*inode));
if (!inode->i_pipe) {
ret = -ENOMEM;
if(!pipe_new(inode))
inode->i_pipe = alloc_pipe_info(inode);
if (!inode->i_pipe)
goto err_nocleanup;
}
filp->f_version = 0;