[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: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Ingo Molnar
Jens Axboe
parent
9aeedfc471
commit
923f4f2394
2 changed files with 111 additions and 101 deletions
49
fs/fifo.c
49
fs/fifo.c
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@ -33,14 +33,17 @@ static void wake_up_partner(struct inode* inode)
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static int fifo_open(struct inode *inode, struct file *filp)
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{
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struct pipe_inode_info *pipe;
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int ret;
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mutex_lock(&inode->i_mutex);
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if (!inode->i_pipe) {
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pipe = inode->i_pipe;
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if (!pipe) {
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ret = -ENOMEM;
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inode->i_pipe = alloc_pipe_info(inode);
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if (!inode->i_pipe)
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pipe = alloc_pipe_info(inode);
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if (!pipe)
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goto err_nocleanup;
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inode->i_pipe = pipe;
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}
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filp->f_version = 0;
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@ -55,18 +58,18 @@ static int fifo_open(struct inode *inode, struct file *filp)
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* opened, even when there is no process writing the FIFO.
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*/
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filp->f_op = &read_fifo_fops;
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inode->i_pipe->r_counter++;
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if (inode->i_pipe->readers++ == 0)
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pipe->r_counter++;
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if (pipe->readers++ == 0)
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wake_up_partner(inode);
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if (!inode->i_pipe->writers) {
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if (!pipe->writers) {
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if ((filp->f_flags & O_NONBLOCK)) {
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/* suppress POLLHUP until we have
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* seen a writer */
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filp->f_version = inode->i_pipe->w_counter;
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filp->f_version = pipe->w_counter;
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} else
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{
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wait_for_partner(inode, &inode->i_pipe->w_counter);
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wait_for_partner(inode, &pipe->w_counter);
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if(signal_pending(current))
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goto err_rd;
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}
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@ -80,16 +83,16 @@ static int fifo_open(struct inode *inode, struct file *filp)
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* errno=ENXIO when there is no process reading the FIFO.
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*/
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ret = -ENXIO;
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if ((filp->f_flags & O_NONBLOCK) && !inode->i_pipe->readers)
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if ((filp->f_flags & O_NONBLOCK) && !pipe->readers)
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goto err;
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filp->f_op = &write_fifo_fops;
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inode->i_pipe->w_counter++;
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if (!inode->i_pipe->writers++)
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pipe->w_counter++;
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if (!pipe->writers++)
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wake_up_partner(inode);
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if (!inode->i_pipe->readers) {
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wait_for_partner(inode, &inode->i_pipe->r_counter);
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if (!pipe->readers) {
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wait_for_partner(inode, &pipe->r_counter);
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if (signal_pending(current))
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goto err_wr;
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}
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@ -104,11 +107,11 @@ static int fifo_open(struct inode *inode, struct file *filp)
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*/
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filp->f_op = &rdwr_fifo_fops;
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inode->i_pipe->readers++;
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inode->i_pipe->writers++;
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inode->i_pipe->r_counter++;
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inode->i_pipe->w_counter++;
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if (inode->i_pipe->readers == 1 || inode->i_pipe->writers == 1)
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pipe->readers++;
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pipe->writers++;
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pipe->r_counter++;
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pipe->w_counter++;
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if (pipe->readers == 1 || pipe->writers == 1)
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wake_up_partner(inode);
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break;
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@ -122,19 +125,19 @@ static int fifo_open(struct inode *inode, struct file *filp)
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return 0;
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err_rd:
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if (!--inode->i_pipe->readers)
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wake_up_interruptible(&inode->i_pipe->wait);
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if (!--pipe->readers)
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wake_up_interruptible(&pipe->wait);
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ret = -ERESTARTSYS;
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goto err;
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err_wr:
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if (!--inode->i_pipe->writers)
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wake_up_interruptible(&inode->i_pipe->wait);
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if (!--pipe->writers)
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wake_up_interruptible(&pipe->wait);
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ret = -ERESTARTSYS;
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goto err;
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err:
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if (!inode->i_pipe->readers && !inode->i_pipe->writers)
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if (!pipe->readers && !pipe->writers)
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free_pipe_info(inode);
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err_nocleanup:
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163
fs/pipe.c
163
fs/pipe.c
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@ -93,7 +93,7 @@ pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len)
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return 0;
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}
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static void anon_pipe_buf_release(struct pipe_inode_info *info, struct pipe_buffer *buf)
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static void anon_pipe_buf_release(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
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{
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struct page *page = buf->page;
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@ -104,8 +104,8 @@ static void anon_pipe_buf_release(struct pipe_inode_info *info, struct pipe_buff
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* temporary page, let's keep track of it as a one-deep
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* allocation cache
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*/
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if (page_count(page) == 1 && !info->tmp_page) {
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info->tmp_page = page;
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if (page_count(page) == 1 && !pipe->tmp_page) {
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pipe->tmp_page = page;
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return;
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}
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@ -115,17 +115,17 @@ static void anon_pipe_buf_release(struct pipe_inode_info *info, struct pipe_buff
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page_cache_release(page);
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}
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static void *anon_pipe_buf_map(struct file *file, struct pipe_inode_info *info, struct pipe_buffer *buf)
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static void *anon_pipe_buf_map(struct file *file, struct pipe_inode_info *pipe, struct pipe_buffer *buf)
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{
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return kmap(buf->page);
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}
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static void anon_pipe_buf_unmap(struct pipe_inode_info *info, struct pipe_buffer *buf)
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static void anon_pipe_buf_unmap(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
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{
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kunmap(buf->page);
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}
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static int anon_pipe_buf_steal(struct pipe_inode_info *info,
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static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
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struct pipe_buffer *buf)
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{
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buf->flags |= PIPE_BUF_FLAG_STOLEN;
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@ -145,7 +145,7 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
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unsigned long nr_segs, loff_t *ppos)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct pipe_inode_info *info;
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struct pipe_inode_info *pipe;
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int do_wakeup;
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ssize_t ret;
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struct iovec *iov = (struct iovec *)_iov;
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@ -159,12 +159,12 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
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do_wakeup = 0;
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ret = 0;
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mutex_lock(&inode->i_mutex);
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info = inode->i_pipe;
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pipe = inode->i_pipe;
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for (;;) {
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int bufs = info->nrbufs;
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int bufs = pipe->nrbufs;
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if (bufs) {
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int curbuf = info->curbuf;
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struct pipe_buffer *buf = info->bufs + curbuf;
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int curbuf = pipe->curbuf;
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struct pipe_buffer *buf = pipe->bufs + curbuf;
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struct pipe_buf_operations *ops = buf->ops;
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void *addr;
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size_t chars = buf->len;
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@ -173,14 +173,14 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
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if (chars > total_len)
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chars = total_len;
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addr = ops->map(filp, info, buf);
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addr = ops->map(filp, pipe, buf);
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if (IS_ERR(addr)) {
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if (!ret)
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ret = PTR_ERR(addr);
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break;
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}
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error = pipe_iov_copy_to_user(iov, addr + buf->offset, chars);
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ops->unmap(info, buf);
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ops->unmap(pipe, buf);
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if (unlikely(error)) {
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if (!ret) ret = -EFAULT;
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break;
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@ -190,10 +190,10 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
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buf->len -= chars;
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if (!buf->len) {
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buf->ops = NULL;
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ops->release(info, buf);
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ops->release(pipe, buf);
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curbuf = (curbuf + 1) & (PIPE_BUFFERS-1);
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info->curbuf = curbuf;
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info->nrbufs = --bufs;
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pipe->curbuf = curbuf;
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pipe->nrbufs = --bufs;
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do_wakeup = 1;
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}
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total_len -= chars;
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@ -202,9 +202,9 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
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}
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if (bufs) /* More to do? */
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continue;
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if (!inode->i_pipe->writers)
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if (!pipe->writers)
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break;
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if (!inode->i_pipe->waiting_writers) {
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if (!pipe->waiting_writers) {
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/* syscall merging: Usually we must not sleep
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* if O_NONBLOCK is set, or if we got some data.
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* But if a writer sleeps in kernel space, then
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@ -222,16 +222,16 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
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break;
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}
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if (do_wakeup) {
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wake_up_interruptible_sync(&inode->i_pipe->wait);
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kill_fasync(&inode->i_pipe->fasync_writers, SIGIO, POLL_OUT);
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wake_up_interruptible_sync(&pipe->wait);
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kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
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}
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pipe_wait(inode->i_pipe);
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pipe_wait(pipe);
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}
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mutex_unlock(&inode->i_mutex);
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/* Signal writers asynchronously that there is more room. */
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if (do_wakeup) {
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wake_up_interruptible(&inode->i_pipe->wait);
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kill_fasync(&inode->i_pipe->fasync_writers, SIGIO, POLL_OUT);
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wake_up_interruptible(&pipe->wait);
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kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
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}
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if (ret > 0)
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file_accessed(filp);
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@ -250,7 +250,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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unsigned long nr_segs, loff_t *ppos)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct pipe_inode_info *info;
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struct pipe_inode_info *pipe;
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ssize_t ret;
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int do_wakeup;
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struct iovec *iov = (struct iovec *)_iov;
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@ -265,9 +265,9 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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do_wakeup = 0;
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ret = 0;
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mutex_lock(&inode->i_mutex);
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info = inode->i_pipe;
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pipe = inode->i_pipe;
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if (!inode->i_pipe->readers) {
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if (!pipe->readers) {
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send_sig(SIGPIPE, current, 0);
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ret = -EPIPE;
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goto out;
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@ -275,23 +275,23 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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/* We try to merge small writes */
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chars = total_len & (PAGE_SIZE-1); /* size of the last buffer */
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if (info->nrbufs && chars != 0) {
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int lastbuf = (info->curbuf + info->nrbufs - 1) & (PIPE_BUFFERS-1);
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struct pipe_buffer *buf = info->bufs + lastbuf;
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if (pipe->nrbufs && chars != 0) {
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int lastbuf = (pipe->curbuf + pipe->nrbufs - 1) & (PIPE_BUFFERS-1);
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struct pipe_buffer *buf = pipe->bufs + lastbuf;
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struct pipe_buf_operations *ops = buf->ops;
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int offset = buf->offset + buf->len;
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if (ops->can_merge && offset + chars <= PAGE_SIZE) {
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void *addr;
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int error;
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addr = ops->map(filp, info, buf);
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addr = ops->map(filp, pipe, buf);
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if (IS_ERR(addr)) {
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error = PTR_ERR(addr);
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goto out;
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}
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error = pipe_iov_copy_from_user(offset + addr, iov,
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chars);
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ops->unmap(info, buf);
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ops->unmap(pipe, buf);
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ret = error;
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do_wakeup = 1;
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if (error)
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@ -306,16 +306,16 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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for (;;) {
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int bufs;
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if (!inode->i_pipe->readers) {
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if (!pipe->readers) {
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send_sig(SIGPIPE, current, 0);
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if (!ret) ret = -EPIPE;
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break;
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}
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bufs = info->nrbufs;
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bufs = pipe->nrbufs;
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if (bufs < PIPE_BUFFERS) {
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int newbuf = (info->curbuf + bufs) & (PIPE_BUFFERS-1);
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struct pipe_buffer *buf = info->bufs + newbuf;
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struct page *page = info->tmp_page;
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int newbuf = (pipe->curbuf + bufs) & (PIPE_BUFFERS-1);
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struct pipe_buffer *buf = pipe->bufs + newbuf;
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struct page *page = pipe->tmp_page;
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int error;
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if (!page) {
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@ -324,7 +324,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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ret = ret ? : -ENOMEM;
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break;
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}
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info->tmp_page = page;
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pipe->tmp_page = page;
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}
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/* Always wakeup, even if the copy fails. Otherwise
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* we lock up (O_NONBLOCK-)readers that sleep due to
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@ -349,8 +349,8 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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buf->ops = &anon_pipe_buf_ops;
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buf->offset = 0;
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buf->len = chars;
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info->nrbufs = ++bufs;
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info->tmp_page = NULL;
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pipe->nrbufs = ++bufs;
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pipe->tmp_page = NULL;
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total_len -= chars;
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if (!total_len)
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@ -367,19 +367,19 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
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break;
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}
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if (do_wakeup) {
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wake_up_interruptible_sync(&inode->i_pipe->wait);
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kill_fasync(&inode->i_pipe->fasync_readers, SIGIO, POLL_IN);
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wake_up_interruptible_sync(&pipe->wait);
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kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
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do_wakeup = 0;
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}
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inode->i_pipe->waiting_writers++;
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pipe_wait(inode->i_pipe);
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inode->i_pipe->waiting_writers--;
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pipe->waiting_writers++;
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pipe_wait(pipe);
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pipe->waiting_writers--;
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}
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out:
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mutex_unlock(&inode->i_mutex);
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if (do_wakeup) {
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wake_up_interruptible(&inode->i_pipe->wait);
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kill_fasync(&inode->i_pipe->fasync_readers, SIGIO, POLL_IN);
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wake_up_interruptible(&pipe->wait);
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kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
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}
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if (ret > 0)
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file_update_time(filp);
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@ -411,21 +411,22 @@ pipe_ioctl(struct inode *pino, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct pipe_inode_info *info;
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struct pipe_inode_info *pipe;
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int count, buf, nrbufs;
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switch (cmd) {
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case FIONREAD:
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mutex_lock(&inode->i_mutex);
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info = inode->i_pipe;
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pipe = inode->i_pipe;
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count = 0;
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buf = info->curbuf;
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nrbufs = info->nrbufs;
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buf = pipe->curbuf;
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nrbufs = pipe->nrbufs;
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while (--nrbufs >= 0) {
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count += info->bufs[buf].len;
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count += pipe->bufs[buf].len;
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buf = (buf+1) & (PIPE_BUFFERS-1);
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}
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mutex_unlock(&inode->i_mutex);
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return put_user(count, (int __user *)arg);
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default:
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return -EINVAL;
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@ -438,17 +439,17 @@ pipe_poll(struct file *filp, poll_table *wait)
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{
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unsigned int mask;
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struct inode *inode = filp->f_dentry->d_inode;
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struct pipe_inode_info *info = inode->i_pipe;
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struct pipe_inode_info *pipe = inode->i_pipe;
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int nrbufs;
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poll_wait(filp, &inode->i_pipe->wait, wait);
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poll_wait(filp, &pipe->wait, wait);
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/* Reading only -- no need for acquiring the semaphore. */
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nrbufs = info->nrbufs;
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nrbufs = pipe->nrbufs;
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mask = 0;
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if (filp->f_mode & FMODE_READ) {
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mask = (nrbufs > 0) ? POLLIN | POLLRDNORM : 0;
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if (!inode->i_pipe->writers && filp->f_version != inode->i_pipe->w_counter)
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if (!pipe->writers && filp->f_version != pipe->w_counter)
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mask |= POLLHUP;
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}
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@ -458,7 +459,7 @@ pipe_poll(struct file *filp, poll_table *wait)
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* Most Unices do not set POLLERR for FIFOs but on Linux they
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||||
* 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:
|
||||
|
|
|
|||
Loading…
Reference in a new issue