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[PATCH] pipe.c/fifo.c code cleanups

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more code cleanups after the macro conversion:

 - standardize on 'struct pipe_inode_info *pipe' variable names
 - introduce 'pipe' temporaries to reduce mass inode->i_pipe dereferencing

Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ingo Molnar 2006-04-11 13:53:33 +02:00 • committed by Jens Axboe
commit 923f4f2394
2 changed files with 111 additions and 101 deletions
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49
fs/fifo.c
View file

@ -33,14 +33,17 @@ static void wake_up_partner(struct inode* inode)
static int fifo_open(struct inode *inode, struct file *filp)
{
struct pipe_inode_info *pipe;
int ret;
mutex_lock(&inode->i_mutex);
if (!inode->i_pipe) {
pipe = inode->i_pipe;
if (!pipe) {
ret = -ENOMEM;
inode->i_pipe = alloc_pipe_info(inode);
if (!inode->i_pipe)
pipe = alloc_pipe_info(inode);
if (!pipe)
goto err_nocleanup;
inode->i_pipe = pipe;
}
filp->f_version = 0;
@ -55,18 +58,18 @@ static int fifo_open(struct inode *inode, struct file *filp)
* opened, even when there is no process writing the FIFO.
*/
filp->f_op = &read_fifo_fops;
inode->i_pipe->r_counter++;
if (inode->i_pipe->readers++ == 0)
pipe->r_counter++;
if (pipe->readers++ == 0)
wake_up_partner(inode);
if (!inode->i_pipe->writers) {
if (!pipe->writers) {
if ((filp->f_flags & O_NONBLOCK)) {
/* suppress POLLHUP until we have
* seen a writer */
filp->f_version = inode->i_pipe->w_counter;
filp->f_version = pipe->w_counter;
} else
{
wait_for_partner(inode, &inode->i_pipe->w_counter);
wait_for_partner(inode, &pipe->w_counter);
if(signal_pending(current))
goto err_rd;
}
@ -80,16 +83,16 @@ static int fifo_open(struct inode *inode, struct file *filp)
* errno=ENXIO when there is no process reading the FIFO.
*/
ret = -ENXIO;
if ((filp->f_flags & O_NONBLOCK) && !inode->i_pipe->readers)
if ((filp->f_flags & O_NONBLOCK) && !pipe->readers)
goto err;
filp->f_op = &write_fifo_fops;
inode->i_pipe->w_counter++;
if (!inode->i_pipe->writers++)
pipe->w_counter++;
if (!pipe->writers++)
wake_up_partner(inode);
if (!inode->i_pipe->readers) {
wait_for_partner(inode, &inode->i_pipe->r_counter);
if (!pipe->readers) {
wait_for_partner(inode, &pipe->r_counter);
if (signal_pending(current))
goto err_wr;
}
@ -104,11 +107,11 @@ static int fifo_open(struct inode *inode, struct file *filp)
*/
filp->f_op = &rdwr_fifo_fops;
inode->i_pipe->readers++;
inode->i_pipe->writers++;
inode->i_pipe->r_counter++;
inode->i_pipe->w_counter++;
if (inode->i_pipe->readers == 1 || inode->i_pipe->writers == 1)
pipe->readers++;
pipe->writers++;
pipe->r_counter++;
pipe->w_counter++;
if (pipe->readers == 1 || pipe->writers == 1)
wake_up_partner(inode);
break;
@ -122,19 +125,19 @@ static int fifo_open(struct inode *inode, struct file *filp)
return 0;
err_rd:
if (!--inode->i_pipe->readers)
wake_up_interruptible(&inode->i_pipe->wait);
if (!--pipe->readers)
wake_up_interruptible(&pipe->wait);
ret = -ERESTARTSYS;
goto err;
err_wr:
if (!--inode->i_pipe->writers)
wake_up_interruptible(&inode->i_pipe->wait);
if (!--pipe->writers)
wake_up_interruptible(&pipe->wait);
ret = -ERESTARTSYS;
goto err;
err:
if (!inode->i_pipe->readers && !inode->i_pipe->writers)
if (!pipe->readers && !pipe->writers)
free_pipe_info(inode);
err_nocleanup: