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raspberrypi-kernel
提交 923f4f23 编写于 作者: I Ingo Molnar 提交者： Jens Axboe
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[PATCH] pipe.c/fifo.c code cleanups 

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: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NJens Axboe <axboe@suse.de>
上级 9aeedfc4
隐藏空白更改
内联 并排
Showing with 111 addition and 101 deletion
fs/fifo.c
浏览文件 @ 923f4f23
......@@ -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:
......
fs/pipe.c
浏览文件 @ 923f4f23
......@@ -93,7 +93,7 @@ pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len)
return 0;
}
static void anon_pipe_buf_release(struct pipe_inode_info *info, struct pipe_buffer *buf)
static void anon_pipe_buf_release(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
{
struct page *page = buf->page;
......@@ -104,8 +104,8 @@ static void anon_pipe_buf_release(struct pipe_inode_info *info, struct pipe_buff
* temporary page, let's keep track of it as a one-deep
* allocation cache
*/
if (page_count(page) == 1 && !info->tmp_page) {
info->tmp_page = page;
if (page_count(page) == 1 && !pipe->tmp_page) {
pipe->tmp_page = page;
return;
}
......@@ -115,17 +115,17 @@ static void anon_pipe_buf_release(struct pipe_inode_info *info, struct pipe_buff
page_cache_release(page);
}
static void *anon_pipe_buf_map(struct file *file, struct pipe_inode_info *info, struct pipe_buffer *buf)
static void *anon_pipe_buf_map(struct file *file, struct pipe_inode_info *pipe, struct pipe_buffer *buf)
{
return kmap(buf->page);
}
static void anon_pipe_buf_unmap(struct pipe_inode_info *info, struct pipe_buffer *buf)
static void anon_pipe_buf_unmap(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
{
kunmap(buf->page);
}
static int anon_pipe_buf_steal(struct pipe_inode_info *info,
static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
buf->flags |= PIPE_BUF_FLAG_STOLEN;
......@@ -145,7 +145,7 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
unsigned long nr_segs, loff_t *ppos)
{
struct inode *inode = filp->f_dentry->d_inode;
struct pipe_inode_info *info;
struct pipe_inode_info *pipe;
int do_wakeup;
ssize_t ret;
struct iovec *iov = (struct iovec *)_iov;
......@@ -159,12 +159,12 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
do_wakeup = 0;
ret = 0;
mutex_lock(&inode->i_mutex);
info = inode->i_pipe;
pipe = inode->i_pipe;
for (;;) {
int bufs = info->nrbufs;
int bufs = pipe->nrbufs;
if (bufs) {
int curbuf = info->curbuf;
struct pipe_buffer *buf = info->bufs + curbuf;
int curbuf = pipe->curbuf;
struct pipe_buffer *buf = pipe->bufs + curbuf;
struct pipe_buf_operations *ops = buf->ops;
void *addr;
size_t chars = buf->len;
......@@ -173,14 +173,14 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
if (chars > total_len)
chars = total_len;
addr = ops->map(filp, info, buf);
addr = ops->map(filp, pipe, buf);
if (IS_ERR(addr)) {
if (!ret)
ret = PTR_ERR(addr);
break;
}
error = pipe_iov_copy_to_user(iov, addr + buf->offset, chars);
ops->unmap(info, buf);
ops->unmap(pipe, buf);
if (unlikely(error)) {
if (!ret) ret = -EFAULT;
break;
......@@ -190,10 +190,10 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
buf->len -= chars;
if (!buf->len) {
buf->ops = NULL;
ops->release(info, buf);
ops->release(pipe, buf);
curbuf = (curbuf + 1) & (PIPE_BUFFERS-1);
info->curbuf = curbuf;
info->nrbufs = --bufs;
pipe->curbuf = curbuf;
pipe->nrbufs = --bufs;
do_wakeup = 1;
}
total_len -= chars;
......@@ -202,9 +202,9 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
}
if (bufs) /* More to do? */
continue;
if (!inode->i_pipe->writers)
if (!pipe->writers)
break;
if (!inode->i_pipe->waiting_writers) {
if (!pipe->waiting_writers) {
/* syscall merging: Usually we must not sleep
* if O_NONBLOCK is set, or if we got some data.
* But if a writer sleeps in kernel space, then
......@@ -222,16 +222,16 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
break;
}
if (do_wakeup) {
wake_up_interruptible_sync(&inode->i_pipe->wait);
kill_fasync(&inode->i_pipe->fasync_writers, SIGIO, POLL_OUT);
wake_up_interruptible_sync(&pipe->wait);
kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
pipe_wait(inode->i_pipe);
pipe_wait(pipe);
}
mutex_unlock(&inode->i_mutex);
/* Signal writers asynchronously that there is more room. */
if (do_wakeup) {
wake_up_interruptible(&inode->i_pipe->wait);
kill_fasync(&inode->i_pipe->fasync_writers, SIGIO, POLL_OUT);
wake_up_interruptible(&pipe->wait);
kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
if (ret > 0)
file_accessed(filp);
......@@ -250,7 +250,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
unsigned long nr_segs, loff_t *ppos)
{
struct inode *inode = filp->f_dentry->d_inode;
struct pipe_inode_info *info;
struct pipe_inode_info *pipe;
ssize_t ret;
int do_wakeup;
struct iovec *iov = (struct iovec *)_iov;
......@@ -265,9 +265,9 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
do_wakeup = 0;
ret = 0;
mutex_lock(&inode->i_mutex);
info = inode->i_pipe;
pipe = inode->i_pipe;
if (!inode->i_pipe->readers) {
if (!pipe->readers) {
send_sig(SIGPIPE, current, 0);
ret = -EPIPE;
goto out;
......@@ -275,23 +275,23 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
/* We try to merge small writes */
chars = total_len & (PAGE_SIZE-1); /* size of the last buffer */
if (info->nrbufs && chars != 0) {
int lastbuf = (info->curbuf + info->nrbufs - 1) & (PIPE_BUFFERS-1);
struct pipe_buffer *buf = info->bufs + lastbuf;
if (pipe->nrbufs && chars != 0) {
int lastbuf = (pipe->curbuf + pipe->nrbufs - 1) & (PIPE_BUFFERS-1);
struct pipe_buffer *buf = pipe->bufs + lastbuf;
struct pipe_buf_operations *ops = buf->ops;
int offset = buf->offset + buf->len;
if (ops->can_merge && offset + chars <= PAGE_SIZE) {
void *addr;
int error;
addr = ops->map(filp, info, buf);
addr = ops->map(filp, pipe, buf);
if (IS_ERR(addr)) {
error = PTR_ERR(addr);
goto out;
}
error = pipe_iov_copy_from_user(offset + addr, iov,
chars);
ops->unmap(info, buf);
ops->unmap(pipe, buf);
ret = error;
do_wakeup = 1;
if (error)
......@@ -306,16 +306,16 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
for (;;) {
int bufs;
if (!inode->i_pipe->readers) {
if (!pipe->readers) {
send_sig(SIGPIPE, current, 0);
if (!ret) ret = -EPIPE;
break;
}
bufs = info->nrbufs;
bufs = pipe->nrbufs;
if (bufs < PIPE_BUFFERS) {
int newbuf = (info->curbuf + bufs) & (PIPE_BUFFERS-1);
struct pipe_buffer *buf = info->bufs + newbuf;
struct page *page = info->tmp_page;
int newbuf = (pipe->curbuf + bufs) & (PIPE_BUFFERS-1);
struct pipe_buffer *buf = pipe->bufs + newbuf;
struct page *page = pipe->tmp_page;
int error;
if (!page) {
......@@ -324,7 +324,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
ret = ret ? : -ENOMEM;
break;
}
info->tmp_page = page;
pipe->tmp_page = page;
}
/* Always wakeup, even if the copy fails. Otherwise
* we lock up (O_NONBLOCK-)readers that sleep due to
......@@ -349,8 +349,8 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
buf->ops = &anon_pipe_buf_ops;
buf->offset = 0;
buf->len = chars;
info->nrbufs = ++bufs;
info->tmp_page = NULL;
pipe->nrbufs = ++bufs;
pipe->tmp_page = NULL;
total_len -= chars;
if (!total_len)
......@@ -367,19 +367,19 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
break;
}
if (do_wakeup) {
wake_up_interruptible_sync(&inode->i_pipe->wait);
kill_fasync(&inode->i_pipe->fasync_readers, SIGIO, POLL_IN);
wake_up_interruptible_sync(&pipe->wait);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
do_wakeup = 0;
}
inode->i_pipe->waiting_writers++;
pipe_wait(inode->i_pipe);
inode->i_pipe->waiting_writers--;
pipe->waiting_writers++;
pipe_wait(pipe);
pipe->waiting_writers--;
}
out:
mutex_unlock(&inode->i_mutex);
if (do_wakeup) {
wake_up_interruptible(&inode->i_pipe->wait);
kill_fasync(&inode->i_pipe->fasync_readers, SIGIO, POLL_IN);
wake_up_interruptible(&pipe->wait);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
}
if (ret > 0)
file_update_time(filp);
......@@ -411,21 +411,22 @@ pipe_ioctl(struct inode *pino, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct inode *inode = filp->f_dentry->d_inode;
struct pipe_inode_info *info;
struct pipe_inode_info *pipe;
int count, buf, nrbufs;
switch (cmd) {
case FIONREAD:
mutex_lock(&inode->i_mutex);
info = inode->i_pipe;
pipe = inode->i_pipe;
count = 0;
buf = info->curbuf;
nrbufs = info->nrbufs;
buf = pipe->curbuf;
nrbufs = pipe->nrbufs;
while (--nrbufs >= 0) {
count += info->bufs[buf].len;
count += pipe->bufs[buf].len;
buf = (buf+1) & (PIPE_BUFFERS-1);
}
mutex_unlock(&inode->i_mutex);
return put_user(count, (int __user *)arg);
default:
return -EINVAL;
......@@ -438,17 +439,17 @@ pipe_poll(struct file *filp, poll_table *wait)
{
unsigned int mask;
struct inode *inode = filp->f_dentry->d_inode;
struct pipe_inode_info *info = inode->i_pipe;
struct pipe_inode_info *pipe = inode->i_pipe;
int nrbufs;
poll_wait(filp, &inode->i_pipe->wait, wait);
poll_wait(filp, &pipe->wait, wait);
/* Reading only -- no need for acquiring the semaphore. */
nrbufs = info->nrbufs;
nrbufs = pipe->nrbufs;
mask = 0;
if (filp->f_mode & FMODE_READ) {
mask = (nrbufs > 0) ? POLLIN | POLLRDNORM : 0;
if (!inode->i_pipe->writers && filp->f_version != inode->i_pipe->w_counter)
if (!pipe->writers && filp->f_version != pipe->w_counter)
mask |= POLLHUP;
}
......@@ -458,7 +459,7 @@ pipe_poll(struct file *filp, poll_table *wait)
* Most Unices do not set POLLERR for FIFOs but on Linux they
* behave exactly like pipes for poll().
*/
if (!inode->i_pipe->readers)
if (!pipe->readers)
mask |= POLLERR;
}
......@@ -468,15 +469,18 @@ pipe_poll(struct file *filp, poll_table *wait)
static int
pipe_release(struct inode *inode, int decr, int decw)
{
struct pipe_inode_info *pipe;
mutex_lock(&inode->i_mutex);
inode->i_pipe->readers -= decr;
inode->i_pipe->writers -= decw;
if (!inode->i_pipe->readers && !inode->i_pipe->writers) {
pipe = inode->i_pipe;
pipe->readers -= decr;
pipe->writers -= decw;
if (!pipe->readers && !pipe->writers) {
free_pipe_info(inode);
} else {
wake_up_interruptible(&inode->i_pipe->wait);
kill_fasync(&inode->i_pipe->fasync_readers, SIGIO, POLL_IN);
kill_fasync(&inode->i_pipe->fasync_writers, SIGIO, POLL_OUT);
wake_up_interruptible(&pipe->wait);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
mutex_unlock(&inode->i_mutex);
......@@ -679,30 +683,30 @@ static struct file_operations rdwr_pipe_fops = {
struct pipe_inode_info * alloc_pipe_info(struct inode *inode)
{
struct pipe_inode_info *info;
struct pipe_inode_info *pipe;
info = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL);
if (info) {
init_waitqueue_head(&info->wait);
info->r_counter = info->w_counter = 1;
info->inode = inode;
pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL);
if (pipe) {
init_waitqueue_head(&pipe->wait);
pipe->r_counter = pipe->w_counter = 1;
pipe->inode = inode;
}
return info;
return pipe;
}
void __free_pipe_info(struct pipe_inode_info *info)
void __free_pipe_info(struct pipe_inode_info *pipe)
{
int i;
for (i = 0; i < PIPE_BUFFERS; i++) {
struct pipe_buffer *buf = info->bufs + i;
struct pipe_buffer *buf = pipe->bufs + i;
if (buf->ops)
buf->ops->release(info, buf);
buf->ops->release(pipe, buf);
}
if (info->tmp_page)
__free_page(info->tmp_page);
kfree(info);
if (pipe->tmp_page)
__free_page(pipe->tmp_page);
kfree(pipe);
}
void free_pipe_info(struct inode *inode)
......@@ -723,15 +727,17 @@ static struct dentry_operations pipefs_dentry_operations = {
static struct inode * get_pipe_inode(void)
{
struct inode *inode = new_inode(pipe_mnt->mnt_sb);
struct pipe_inode_info *pipe;
if (!inode)
goto fail_inode;
inode->i_pipe = alloc_pipe_info(inode);
if (!inode->i_pipe)
pipe = alloc_pipe_info(inode);
if (!pipe)
goto fail_iput;
inode->i_pipe = pipe;
inode->i_pipe->readers = inode->i_pipe->writers = 1;
pipe->readers = pipe->writers = 1;
inode->i_fop = &rdwr_pipe_fops;
/*
......@@ -746,6 +752,7 @@ static struct inode * get_pipe_inode(void)
inode->i_gid = current->fsgid;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_blksize = PAGE_SIZE;
return inode;
fail_iput:
......
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