diff options
author | Ingo Molnar <mingo@elte.hu> | 2006-04-11 13:53:33 +0200 |
---|---|---|
committer | Jens Axboe <axboe@suse.de> | 2006-04-11 13:53:33 +0200 |
commit | 923f4f23940d2361e8d5c4245982163a8e9d1c91 (patch) | |
tree | 05d24681cadfd731a083b0fa3b22b6e7a6622555 /fs/pipe.c | |
parent | 9aeedfc4712ed58d9f7ae41596185c72b8dc97e8 (diff) | |
download | linux-923f4f23940d2361e8d5c4245982163a8e9d1c91.tar.bz2 |
[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>
Diffstat (limited to 'fs/pipe.c')
-rw-r--r-- | fs/pipe.c | 163 |
1 files changed, 85 insertions, 78 deletions
diff --git a/fs/pipe.c b/fs/pipe.c index 0602fc9f7eba..b941e1951eac 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -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: |