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fs/pipe.c
26.8 KB
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/* * linux/fs/pipe.c * * Copyright (C) 1991, 1992, 1999 Linus Torvalds */ #include <linux/mm.h> #include <linux/file.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/init.h> #include <linux/fs.h> |
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#include <linux/log2.h> |
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#include <linux/mount.h> |
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#include <linux/magic.h> |
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#include <linux/pipe_fs_i.h> #include <linux/uio.h> #include <linux/highmem.h> |
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#include <linux/pagemap.h> |
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#include <linux/audit.h> |
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#include <linux/syscalls.h> |
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#include <linux/fcntl.h> |
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#include <linux/aio.h> |
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#include <asm/uaccess.h> #include <asm/ioctls.h> |
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#include "internal.h" |
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/* |
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* The max size that a non-root user is allowed to grow the pipe. Can |
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* be set by root in /proc/sys/fs/pipe-max-size |
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*/ |
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unsigned int pipe_max_size = 1048576; /* * Minimum pipe size, as required by POSIX */ unsigned int pipe_min_size = PAGE_SIZE; |
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/* |
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* We use a start+len construction, which provides full use of the * allocated memory. * -- Florian Coosmann (FGC) * * Reads with count = 0 should always return 0. * -- Julian Bradfield 1999-06-07. * * FIFOs and Pipes now generate SIGIO for both readers and writers. * -- Jeremy Elson <jelson@circlemud.org> 2001-08-16 * * pipe_read & write cleanup * -- Manfred Spraul <manfred@colorfullife.com> 2002-05-09 */ |
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static void pipe_lock_nested(struct pipe_inode_info *pipe, int subclass) { |
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if (pipe->files) |
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mutex_lock_nested(&pipe->mutex, subclass); |
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} void pipe_lock(struct pipe_inode_info *pipe) { /* * pipe_lock() nests non-pipe inode locks (for writing to a file) */ pipe_lock_nested(pipe, I_MUTEX_PARENT); } EXPORT_SYMBOL(pipe_lock); void pipe_unlock(struct pipe_inode_info *pipe) { |
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if (pipe->files) |
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mutex_unlock(&pipe->mutex); |
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} EXPORT_SYMBOL(pipe_unlock); |
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static inline void __pipe_lock(struct pipe_inode_info *pipe) { mutex_lock_nested(&pipe->mutex, I_MUTEX_PARENT); } static inline void __pipe_unlock(struct pipe_inode_info *pipe) { mutex_unlock(&pipe->mutex); } |
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void pipe_double_lock(struct pipe_inode_info *pipe1, struct pipe_inode_info *pipe2) { BUG_ON(pipe1 == pipe2); if (pipe1 < pipe2) { pipe_lock_nested(pipe1, I_MUTEX_PARENT); pipe_lock_nested(pipe2, I_MUTEX_CHILD); } else { |
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pipe_lock_nested(pipe2, I_MUTEX_PARENT); pipe_lock_nested(pipe1, I_MUTEX_CHILD); |
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} } |
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/* Drop the inode semaphore and wait for a pipe event, atomically */ |
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void pipe_wait(struct pipe_inode_info *pipe) |
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{ DEFINE_WAIT(wait); |
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/* * Pipes are system-local resources, so sleeping on them * is considered a noninteractive wait: */ |
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prepare_to_wait(&pipe->wait, &wait, TASK_INTERRUPTIBLE); |
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pipe_unlock(pipe); |
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schedule(); |
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finish_wait(&pipe->wait, &wait); |
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pipe_lock(pipe); |
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} |
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static int |
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pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len, int atomic) |
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{ unsigned long copy; while (len > 0) { while (!iov->iov_len) iov++; copy = min_t(unsigned long, len, iov->iov_len); |
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if (atomic) { if (__copy_from_user_inatomic(to, iov->iov_base, copy)) return -EFAULT; } else { if (copy_from_user(to, iov->iov_base, copy)) return -EFAULT; } |
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to += copy; len -= copy; iov->iov_base += copy; iov->iov_len -= copy; } return 0; } |
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/* * Pre-fault in the user memory, so we can use atomic copies. */ static void iov_fault_in_pages_read(struct iovec *iov, unsigned long len) { while (!iov->iov_len) iov++; while (len > 0) { unsigned long this_len; this_len = min_t(unsigned long, len, iov->iov_len); fault_in_pages_readable(iov->iov_base, this_len); len -= this_len; iov++; } } |
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static void anon_pipe_buf_release(struct pipe_inode_info *pipe, struct pipe_buffer *buf) |
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{ struct page *page = buf->page; |
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/* * If nobody else uses this page, and we don't already have a * temporary page, let's keep track of it as a one-deep |
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* allocation cache. (Otherwise just release our reference to it) |
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*/ |
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if (page_count(page) == 1 && !pipe->tmp_page) |
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pipe->tmp_page = page; |
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else page_cache_release(page); |
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} |
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/** |
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* generic_pipe_buf_steal - attempt to take ownership of a &pipe_buffer |
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* @pipe: the pipe that the buffer belongs to * @buf: the buffer to attempt to steal * * Description: |
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* This function attempts to steal the &struct page attached to |
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* @buf. If successful, this function returns 0 and returns with * the page locked. The caller may then reuse the page for whatever |
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* he wishes; the typical use is insertion into a different file |
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* page cache. */ |
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int generic_pipe_buf_steal(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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/* * A reference of one is golden, that means that the owner of this * page is the only one holding a reference to it. lock the page * and return OK. */ |
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if (page_count(page) == 1) { |
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lock_page(page); return 0; } return 1; |
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} |
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EXPORT_SYMBOL(generic_pipe_buf_steal); |
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|
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/** |
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* generic_pipe_buf_get - get a reference to a &struct pipe_buffer |
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* @pipe: the pipe that the buffer belongs to * @buf: the buffer to get a reference to * * Description: * This function grabs an extra reference to @buf. It's used in * in the tee() system call, when we duplicate the buffers in one * pipe into another. */ void generic_pipe_buf_get(struct pipe_inode_info *pipe, struct pipe_buffer *buf) |
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{ page_cache_get(buf->page); } |
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EXPORT_SYMBOL(generic_pipe_buf_get); |
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|
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/** * generic_pipe_buf_confirm - verify contents of the pipe buffer |
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* @info: the pipe that the buffer belongs to |
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* @buf: the buffer to confirm * * Description: * This function does nothing, because the generic pipe code uses * pages that are always good when inserted into the pipe. */ |
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int generic_pipe_buf_confirm(struct pipe_inode_info *info, struct pipe_buffer *buf) |
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{ return 0; } |
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EXPORT_SYMBOL(generic_pipe_buf_confirm); |
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|
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/** * generic_pipe_buf_release - put a reference to a &struct pipe_buffer * @pipe: the pipe that the buffer belongs to * @buf: the buffer to put a reference to * * Description: * This function releases a reference to @buf. */ void generic_pipe_buf_release(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { page_cache_release(buf->page); } |
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EXPORT_SYMBOL(generic_pipe_buf_release); |
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|
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static const struct pipe_buf_operations anon_pipe_buf_ops = { |
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.can_merge = 1, |
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.confirm = generic_pipe_buf_confirm, |
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.release = anon_pipe_buf_release, |
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.steal = generic_pipe_buf_steal, |
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.get = generic_pipe_buf_get, |
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}; |
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static const struct pipe_buf_operations packet_pipe_buf_ops = { .can_merge = 0, |
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.confirm = generic_pipe_buf_confirm, .release = anon_pipe_buf_release, .steal = generic_pipe_buf_steal, .get = generic_pipe_buf_get, }; |
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static ssize_t |
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pipe_read(struct kiocb *iocb, const struct iovec *_iov, unsigned long nr_segs, loff_t pos) |
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{ |
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struct file *filp = iocb->ki_filp; |
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struct pipe_inode_info *pipe = filp->private_data; |
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int do_wakeup; ssize_t ret; struct iovec *iov = (struct iovec *)_iov; size_t total_len; |
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struct iov_iter iter; |
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total_len = iov_length(iov, nr_segs); /* Null read succeeds. */ if (unlikely(total_len == 0)) return 0; |
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iov_iter_init(&iter, iov, nr_segs, total_len, 0); |
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do_wakeup = 0; ret = 0; |
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__pipe_lock(pipe); |
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for (;;) { |
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int bufs = pipe->nrbufs; |
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if (bufs) { |
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int curbuf = pipe->curbuf; struct pipe_buffer *buf = pipe->bufs + curbuf; |
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const struct pipe_buf_operations *ops = buf->ops; |
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size_t chars = buf->len; |
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size_t written; int error; |
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if (chars > total_len) chars = total_len; |
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error = ops->confirm(pipe, buf); |
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if (error) { |
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if (!ret) |
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ret = error; |
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break; } |
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|
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written = copy_page_to_iter(buf->page, buf->offset, chars, &iter); if (unlikely(written < chars)) { |
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if (!ret) |
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ret = -EFAULT; |
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break; } ret += chars; buf->offset += chars; buf->len -= chars; |
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/* Was it a packet buffer? Clean up and exit */ if (buf->flags & PIPE_BUF_FLAG_PACKET) { total_len = chars; buf->len = 0; } |
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if (!buf->len) { buf->ops = NULL; |
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ops->release(pipe, buf); |
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curbuf = (curbuf + 1) & (pipe->buffers - 1); |
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pipe->curbuf = curbuf; pipe->nrbufs = --bufs; |
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do_wakeup = 1; } total_len -= chars; if (!total_len) break; /* common path: read succeeded */ } if (bufs) /* More to do? */ continue; |
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if (!pipe->writers) |
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break; |
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if (!pipe->waiting_writers) { |
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/* 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 * we can wait for that data without violating POSIX. */ if (ret) break; if (filp->f_flags & O_NONBLOCK) { ret = -EAGAIN; break; } } if (signal_pending(current)) { |
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if (!ret) ret = -ERESTARTSYS; |
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break; } if (do_wakeup) { |
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wake_up_interruptible_sync_poll(&pipe->wait, POLLOUT | POLLWRNORM); |
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kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); |
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} |
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pipe_wait(pipe); |
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} |
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__pipe_unlock(pipe); |
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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_sync_poll(&pipe->wait, POLLOUT | POLLWRNORM); |
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kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); |
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} if (ret > 0) file_accessed(filp); return ret; } |
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static inline int is_packetized(struct file *file) { return (file->f_flags & O_DIRECT) != 0; } |
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static ssize_t |
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pipe_write(struct kiocb *iocb, const struct iovec *_iov, unsigned long nr_segs, loff_t ppos) |
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{ |
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struct file *filp = iocb->ki_filp; |
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struct pipe_inode_info *pipe = filp->private_data; |
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ssize_t ret; int do_wakeup; struct iovec *iov = (struct iovec *)_iov; size_t total_len; ssize_t chars; total_len = iov_length(iov, nr_segs); /* Null write succeeds. */ if (unlikely(total_len == 0)) return 0; do_wakeup = 0; ret = 0; |
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__pipe_lock(pipe); |
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|
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if (!pipe->readers) { |
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send_sig(SIGPIPE, current, 0); ret = -EPIPE; goto out; } /* We try to merge small writes */ chars = total_len & (PAGE_SIZE-1); /* size of the last buffer */ |
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if (pipe->nrbufs && chars != 0) { |
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int lastbuf = (pipe->curbuf + pipe->nrbufs - 1) & |
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(pipe->buffers - 1); |
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struct pipe_buffer *buf = pipe->bufs + lastbuf; |
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const struct pipe_buf_operations *ops = buf->ops; |
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int offset = buf->offset + buf->len; |
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|
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if (ops->can_merge && offset + chars <= PAGE_SIZE) { |
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int error, atomic = 1; |
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void *addr; |
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|
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error = ops->confirm(pipe, buf); |
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if (error) |
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goto out; |
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|
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iov_fault_in_pages_read(iov, chars); redo1: |
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if (atomic) addr = kmap_atomic(buf->page); else addr = kmap(buf->page); |
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error = pipe_iov_copy_from_user(offset + addr, iov, |
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chars, atomic); |
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if (atomic) kunmap_atomic(addr); else kunmap(buf->page); |
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ret = error; do_wakeup = 1; |
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if (error) { if (atomic) { atomic = 0; goto redo1; } |
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goto out; |
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} |
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buf->len += chars; total_len -= chars; ret = chars; if (!total_len) goto out; } } for (;;) { int bufs; |
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|
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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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bufs = pipe->nrbufs; |
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if (bufs < pipe->buffers) { int newbuf = (pipe->curbuf + bufs) & (pipe->buffers-1); |
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struct pipe_buffer *buf = pipe->bufs + newbuf; struct page *page = pipe->tmp_page; |
f6762b7ad [PATCH] pipe: ena... |
453 454 |
char *src; int error, atomic = 1; |
1da177e4c Linux-2.6.12-rc2 |
455 456 457 458 459 460 461 |
if (!page) { page = alloc_page(GFP_HIGHUSER); if (unlikely(!page)) { ret = ret ? : -ENOMEM; break; } |
923f4f239 [PATCH] pipe.c/fi... |
462 |
pipe->tmp_page = page; |
1da177e4c Linux-2.6.12-rc2 |
463 |
} |
341b446bc [PATCH] another r... |
464 |
/* Always wake up, even if the copy fails. Otherwise |
1da177e4c Linux-2.6.12-rc2 |
465 466 467 468 469 470 471 472 |
* we lock up (O_NONBLOCK-)readers that sleep due to * syscall merging. * FIXME! Is this really true? */ do_wakeup = 1; chars = PAGE_SIZE; if (chars > total_len) chars = total_len; |
f6762b7ad [PATCH] pipe: ena... |
473 474 475 |
iov_fault_in_pages_read(iov, chars); redo2: if (atomic) |
e8e3c3d66 fs: remove the se... |
476 |
src = kmap_atomic(page); |
f6762b7ad [PATCH] pipe: ena... |
477 478 479 480 481 482 |
else src = kmap(page); error = pipe_iov_copy_from_user(src, iov, chars, atomic); if (atomic) |
e8e3c3d66 fs: remove the se... |
483 |
kunmap_atomic(src); |
f6762b7ad [PATCH] pipe: ena... |
484 485 |
else kunmap(page); |
1da177e4c Linux-2.6.12-rc2 |
486 |
if (unlikely(error)) { |
f6762b7ad [PATCH] pipe: ena... |
487 488 489 490 |
if (atomic) { atomic = 0; goto redo2; } |
341b446bc [PATCH] another r... |
491 |
if (!ret) |
f6762b7ad [PATCH] pipe: ena... |
492 |
ret = error; |
1da177e4c Linux-2.6.12-rc2 |
493 494 495 496 497 498 499 500 501 |
break; } ret += chars; /* Insert it into the buffer array */ buf->page = page; buf->ops = &anon_pipe_buf_ops; buf->offset = 0; buf->len = chars; |
9883035ae pipes: add a "pac... |
502 503 504 505 506 |
buf->flags = 0; if (is_packetized(filp)) { buf->ops = &packet_pipe_buf_ops; buf->flags = PIPE_BUF_FLAG_PACKET; } |
923f4f239 [PATCH] pipe.c/fi... |
507 508 |
pipe->nrbufs = ++bufs; pipe->tmp_page = NULL; |
1da177e4c Linux-2.6.12-rc2 |
509 510 511 512 513 |
total_len -= chars; if (!total_len) break; } |
35f3d14db pipe: add support... |
514 |
if (bufs < pipe->buffers) |
1da177e4c Linux-2.6.12-rc2 |
515 516 |
continue; if (filp->f_flags & O_NONBLOCK) { |
341b446bc [PATCH] another r... |
517 518 |
if (!ret) ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
519 520 521 |
break; } if (signal_pending(current)) { |
341b446bc [PATCH] another r... |
522 523 |
if (!ret) ret = -ERESTARTSYS; |
1da177e4c Linux-2.6.12-rc2 |
524 525 526 |
break; } if (do_wakeup) { |
28e58ee8c Fix broken "pipe:... |
527 |
wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLRDNORM); |
923f4f239 [PATCH] pipe.c/fi... |
528 |
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
1da177e4c Linux-2.6.12-rc2 |
529 530 |
do_wakeup = 0; } |
923f4f239 [PATCH] pipe.c/fi... |
531 532 533 |
pipe->waiting_writers++; pipe_wait(pipe); pipe->waiting_writers--; |
1da177e4c Linux-2.6.12-rc2 |
534 535 |
} out: |
ebec73f47 introduce variant... |
536 |
__pipe_unlock(pipe); |
1da177e4c Linux-2.6.12-rc2 |
537 |
if (do_wakeup) { |
28e58ee8c Fix broken "pipe:... |
538 |
wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLRDNORM); |
923f4f239 [PATCH] pipe.c/fi... |
539 |
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
1da177e4c Linux-2.6.12-rc2 |
540 |
} |
7e775f46a fs/pipe.c: skip f... |
541 |
if (ret > 0 && sb_start_write_trylock(file_inode(filp)->i_sb)) { |
c3b2da314 fs: introduce ino... |
542 543 544 |
int err = file_update_time(filp); if (err) ret = err; |
7e775f46a fs/pipe.c: skip f... |
545 |
sb_end_write(file_inode(filp)->i_sb); |
c3b2da314 fs: introduce ino... |
546 |
} |
1da177e4c Linux-2.6.12-rc2 |
547 548 |
return ret; } |
d59d0b1b8 BKL-Removal: conv... |
549 |
static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
550 |
{ |
de32ec4cf pipe: set file->p... |
551 |
struct pipe_inode_info *pipe = filp->private_data; |
1da177e4c Linux-2.6.12-rc2 |
552 553 554 555 |
int count, buf, nrbufs; switch (cmd) { case FIONREAD: |
ebec73f47 introduce variant... |
556 |
__pipe_lock(pipe); |
1da177e4c Linux-2.6.12-rc2 |
557 |
count = 0; |
923f4f239 [PATCH] pipe.c/fi... |
558 559 |
buf = pipe->curbuf; nrbufs = pipe->nrbufs; |
1da177e4c Linux-2.6.12-rc2 |
560 |
while (--nrbufs >= 0) { |
923f4f239 [PATCH] pipe.c/fi... |
561 |
count += pipe->bufs[buf].len; |
35f3d14db pipe: add support... |
562 |
buf = (buf+1) & (pipe->buffers - 1); |
1da177e4c Linux-2.6.12-rc2 |
563 |
} |
ebec73f47 introduce variant... |
564 |
__pipe_unlock(pipe); |
923f4f239 [PATCH] pipe.c/fi... |
565 |
|
1da177e4c Linux-2.6.12-rc2 |
566 567 |
return put_user(count, (int __user *)arg); default: |
46ce341b2 pipe: return -ENO... |
568 |
return -ENOIOCTLCMD; |
1da177e4c Linux-2.6.12-rc2 |
569 570 571 572 573 574 575 576 |
} } /* No kernel lock held - fine */ static unsigned int pipe_poll(struct file *filp, poll_table *wait) { unsigned int mask; |
de32ec4cf pipe: set file->p... |
577 |
struct pipe_inode_info *pipe = filp->private_data; |
1da177e4c Linux-2.6.12-rc2 |
578 |
int nrbufs; |
923f4f239 [PATCH] pipe.c/fi... |
579 |
poll_wait(filp, &pipe->wait, wait); |
1da177e4c Linux-2.6.12-rc2 |
580 581 |
/* Reading only -- no need for acquiring the semaphore. */ |
923f4f239 [PATCH] pipe.c/fi... |
582 |
nrbufs = pipe->nrbufs; |
1da177e4c Linux-2.6.12-rc2 |
583 584 585 |
mask = 0; if (filp->f_mode & FMODE_READ) { mask = (nrbufs > 0) ? POLLIN | POLLRDNORM : 0; |
923f4f239 [PATCH] pipe.c/fi... |
586 |
if (!pipe->writers && filp->f_version != pipe->w_counter) |
1da177e4c Linux-2.6.12-rc2 |
587 588 589 590 |
mask |= POLLHUP; } if (filp->f_mode & FMODE_WRITE) { |
35f3d14db pipe: add support... |
591 |
mask |= (nrbufs < pipe->buffers) ? POLLOUT | POLLWRNORM : 0; |
5e5d7a222 [PATCH] pipe: rem... |
592 593 594 595 |
/* * Most Unices do not set POLLERR for FIFOs but on Linux they * behave exactly like pipes for poll(). */ |
923f4f239 [PATCH] pipe.c/fi... |
596 |
if (!pipe->readers) |
1da177e4c Linux-2.6.12-rc2 |
597 598 599 600 601 |
mask |= POLLERR; } return mask; } |
b0d8d2292 vfs: fix subtle u... |
602 603 604 605 606 607 608 609 610 611 612 613 614 615 |
static void put_pipe_info(struct inode *inode, struct pipe_inode_info *pipe) { int kill = 0; spin_lock(&inode->i_lock); if (!--pipe->files) { inode->i_pipe = NULL; kill = 1; } spin_unlock(&inode->i_lock); if (kill) free_pipe_info(pipe); } |
1da177e4c Linux-2.6.12-rc2 |
616 |
static int |
599a0ac14 pipe: fold file_o... |
617 |
pipe_release(struct inode *inode, struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
618 |
{ |
b0d8d2292 vfs: fix subtle u... |
619 |
struct pipe_inode_info *pipe = file->private_data; |
923f4f239 [PATCH] pipe.c/fi... |
620 |
|
ebec73f47 introduce variant... |
621 |
__pipe_lock(pipe); |
599a0ac14 pipe: fold file_o... |
622 623 624 625 |
if (file->f_mode & FMODE_READ) pipe->readers--; if (file->f_mode & FMODE_WRITE) pipe->writers--; |
341b446bc [PATCH] another r... |
626 |
|
ba5bb1473 pipe: take alloca... |
627 |
if (pipe->readers || pipe->writers) { |
28e58ee8c Fix broken "pipe:... |
628 |
wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM | POLLERR | POLLHUP); |
923f4f239 [PATCH] pipe.c/fi... |
629 630 |
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); |
1da177e4c Linux-2.6.12-rc2 |
631 |
} |
ebec73f47 introduce variant... |
632 |
__pipe_unlock(pipe); |
ba5bb1473 pipe: take alloca... |
633 |
|
b0d8d2292 vfs: fix subtle u... |
634 |
put_pipe_info(inode, pipe); |
1da177e4c Linux-2.6.12-rc2 |
635 636 637 638 |
return 0; } static int |
599a0ac14 pipe: fold file_o... |
639 |
pipe_fasync(int fd, struct file *filp, int on) |
1da177e4c Linux-2.6.12-rc2 |
640 |
{ |
de32ec4cf pipe: set file->p... |
641 |
struct pipe_inode_info *pipe = filp->private_data; |
599a0ac14 pipe: fold file_o... |
642 |
int retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
643 |
|
ebec73f47 introduce variant... |
644 |
__pipe_lock(pipe); |
599a0ac14 pipe: fold file_o... |
645 646 647 |
if (filp->f_mode & FMODE_READ) retval = fasync_helper(fd, filp, on, &pipe->fasync_readers); if ((filp->f_mode & FMODE_WRITE) && retval >= 0) { |
341b446bc [PATCH] another r... |
648 |
retval = fasync_helper(fd, filp, on, &pipe->fasync_writers); |
599a0ac14 pipe: fold file_o... |
649 650 |
if (retval < 0 && (filp->f_mode & FMODE_READ)) /* this can happen only if on == T */ |
e5bc49ba7 pipe_rdwr_fasync:... |
651 652 |
fasync_helper(-1, filp, 0, &pipe->fasync_readers); } |
ebec73f47 introduce variant... |
653 |
__pipe_unlock(pipe); |
60aa49243 Rationalize fasyn... |
654 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
655 |
} |
7bee130e2 get rid of alloc_... |
656 |
struct pipe_inode_info *alloc_pipe_info(void) |
3a326a2ce [PATCH] introduce... |
657 |
{ |
923f4f239 [PATCH] pipe.c/fi... |
658 |
struct pipe_inode_info *pipe; |
3a326a2ce [PATCH] introduce... |
659 |
|
923f4f239 [PATCH] pipe.c/fi... |
660 661 |
pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL); if (pipe) { |
35f3d14db pipe: add support... |
662 663 664 665 |
pipe->bufs = kzalloc(sizeof(struct pipe_buffer) * PIPE_DEF_BUFFERS, GFP_KERNEL); if (pipe->bufs) { init_waitqueue_head(&pipe->wait); pipe->r_counter = pipe->w_counter = 1; |
35f3d14db pipe: add support... |
666 |
pipe->buffers = PIPE_DEF_BUFFERS; |
72b0d9aac pipe: don't use -... |
667 |
mutex_init(&pipe->mutex); |
35f3d14db pipe: add support... |
668 669 670 |
return pipe; } kfree(pipe); |
3a326a2ce [PATCH] introduce... |
671 |
} |
35f3d14db pipe: add support... |
672 |
return NULL; |
3a326a2ce [PATCH] introduce... |
673 |
} |
4b8a8f1e4 get rid of the la... |
674 |
void free_pipe_info(struct pipe_inode_info *pipe) |
1da177e4c Linux-2.6.12-rc2 |
675 676 |
{ int i; |
1da177e4c Linux-2.6.12-rc2 |
677 |
|
35f3d14db pipe: add support... |
678 |
for (i = 0; i < pipe->buffers; i++) { |
923f4f239 [PATCH] pipe.c/fi... |
679 |
struct pipe_buffer *buf = pipe->bufs + i; |
1da177e4c Linux-2.6.12-rc2 |
680 |
if (buf->ops) |
923f4f239 [PATCH] pipe.c/fi... |
681 |
buf->ops->release(pipe, buf); |
1da177e4c Linux-2.6.12-rc2 |
682 |
} |
923f4f239 [PATCH] pipe.c/fi... |
683 684 |
if (pipe->tmp_page) __free_page(pipe->tmp_page); |
35f3d14db pipe: add support... |
685 |
kfree(pipe->bufs); |
923f4f239 [PATCH] pipe.c/fi... |
686 |
kfree(pipe); |
1da177e4c Linux-2.6.12-rc2 |
687 |
} |
fa3536cc1 [PATCH] Use __rea... |
688 |
static struct vfsmount *pipe_mnt __read_mostly; |
341b446bc [PATCH] another r... |
689 |
|
c23fbb6bc VFS: delay the de... |
690 691 692 693 694 695 696 697 |
/* * pipefs_dname() is called from d_path(). */ static char *pipefs_dname(struct dentry *dentry, char *buffer, int buflen) { return dynamic_dname(dentry, buffer, buflen, "pipe:[%lu]", dentry->d_inode->i_ino); } |
3ba13d179 constify dentry_o... |
698 |
static const struct dentry_operations pipefs_dentry_operations = { |
c23fbb6bc VFS: delay the de... |
699 |
.d_dname = pipefs_dname, |
1da177e4c Linux-2.6.12-rc2 |
700 701 702 703 |
}; static struct inode * get_pipe_inode(void) { |
a209dfc7b vfs: dont chain p... |
704 |
struct inode *inode = new_inode_pseudo(pipe_mnt->mnt_sb); |
923f4f239 [PATCH] pipe.c/fi... |
705 |
struct pipe_inode_info *pipe; |
1da177e4c Linux-2.6.12-rc2 |
706 707 708 |
if (!inode) goto fail_inode; |
85fe4025c fs: do not assign... |
709 |
inode->i_ino = get_next_ino(); |
7bee130e2 get rid of alloc_... |
710 |
pipe = alloc_pipe_info(); |
923f4f239 [PATCH] pipe.c/fi... |
711 |
if (!pipe) |
1da177e4c Linux-2.6.12-rc2 |
712 |
goto fail_iput; |
3a326a2ce [PATCH] introduce... |
713 |
|
ba5bb1473 pipe: take alloca... |
714 715 |
inode->i_pipe = pipe; pipe->files = 2; |
923f4f239 [PATCH] pipe.c/fi... |
716 |
pipe->readers = pipe->writers = 1; |
599a0ac14 pipe: fold file_o... |
717 |
inode->i_fop = &pipefifo_fops; |
1da177e4c Linux-2.6.12-rc2 |
718 719 720 721 722 723 724 725 726 |
/* * Mark the inode dirty from the very beginning, * that way it will never be moved to the dirty * list because "mark_inode_dirty()" will think * that it already _is_ on the dirty list. */ inode->i_state = I_DIRTY; inode->i_mode = S_IFIFO | S_IRUSR | S_IWUSR; |
da9592ede CRED: Wrap task c... |
727 728 |
inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); |
1da177e4c Linux-2.6.12-rc2 |
729 |
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
923f4f239 [PATCH] pipe.c/fi... |
730 |
|
1da177e4c Linux-2.6.12-rc2 |
731 732 733 734 |
return inode; fail_iput: iput(inode); |
341b446bc [PATCH] another r... |
735 |
|
1da177e4c Linux-2.6.12-rc2 |
736 737 738 |
fail_inode: return NULL; } |
e4fad8e5d consolidate pipe ... |
739 |
int create_pipe_files(struct file **res, int flags) |
1da177e4c Linux-2.6.12-rc2 |
740 |
{ |
d6cbd281d [PATCH] Some clea... |
741 |
int err; |
e4fad8e5d consolidate pipe ... |
742 |
struct inode *inode = get_pipe_inode(); |
d6cbd281d [PATCH] Some clea... |
743 |
struct file *f; |
2c48b9c45 switch alloc_file... |
744 |
struct path path; |
e4fad8e5d consolidate pipe ... |
745 |
static struct qstr name = { .name = "" }; |
1da177e4c Linux-2.6.12-rc2 |
746 |
|
1da177e4c Linux-2.6.12-rc2 |
747 |
if (!inode) |
e4fad8e5d consolidate pipe ... |
748 |
return -ENFILE; |
1da177e4c Linux-2.6.12-rc2 |
749 |
|
d6cbd281d [PATCH] Some clea... |
750 |
err = -ENOMEM; |
4b936885a fs: improve scala... |
751 |
path.dentry = d_alloc_pseudo(pipe_mnt->mnt_sb, &name); |
2c48b9c45 switch alloc_file... |
752 |
if (!path.dentry) |
d6cbd281d [PATCH] Some clea... |
753 |
goto err_inode; |
2c48b9c45 switch alloc_file... |
754 |
path.mnt = mntget(pipe_mnt); |
341b446bc [PATCH] another r... |
755 |
|
2c48b9c45 switch alloc_file... |
756 |
d_instantiate(path.dentry, inode); |
430e285e0 [PATCH] fix up ne... |
757 758 |
err = -ENFILE; |
599a0ac14 pipe: fold file_o... |
759 |
f = alloc_file(&path, FMODE_WRITE, &pipefifo_fops); |
39b652527 fs: Preserve erro... |
760 |
if (IS_ERR(f)) |
430e285e0 [PATCH] fix up ne... |
761 |
goto err_dentry; |
341b446bc [PATCH] another r... |
762 |
|
9883035ae pipes: add a "pac... |
763 |
f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT)); |
de32ec4cf pipe: set file->p... |
764 |
f->private_data = inode->i_pipe; |
d6cbd281d [PATCH] Some clea... |
765 |
|
599a0ac14 pipe: fold file_o... |
766 |
res[0] = alloc_file(&path, FMODE_READ, &pipefifo_fops); |
39b652527 fs: Preserve erro... |
767 |
if (IS_ERR(res[0])) |
e4fad8e5d consolidate pipe ... |
768 769 770 |
goto err_file; path_get(&path); |
de32ec4cf pipe: set file->p... |
771 |
res[0]->private_data = inode->i_pipe; |
e4fad8e5d consolidate pipe ... |
772 773 774 |
res[0]->f_flags = O_RDONLY | (flags & O_NONBLOCK); res[1] = f; return 0; |
1da177e4c Linux-2.6.12-rc2 |
775 |
|
e4fad8e5d consolidate pipe ... |
776 777 778 |
err_file: put_filp(f); err_dentry: |
4b8a8f1e4 get rid of the la... |
779 |
free_pipe_info(inode->i_pipe); |
2c48b9c45 switch alloc_file... |
780 |
path_put(&path); |
e4fad8e5d consolidate pipe ... |
781 |
return err; |
ed1524371 [PATCH] double-fr... |
782 |
|
e4fad8e5d consolidate pipe ... |
783 |
err_inode: |
4b8a8f1e4 get rid of the la... |
784 |
free_pipe_info(inode->i_pipe); |
1da177e4c Linux-2.6.12-rc2 |
785 |
iput(inode); |
e4fad8e5d consolidate pipe ... |
786 |
return err; |
d6cbd281d [PATCH] Some clea... |
787 |
} |
5b249b1b0 pipe(2) - race-fr... |
788 |
static int __do_pipe_flags(int *fd, struct file **files, int flags) |
d6cbd281d [PATCH] Some clea... |
789 |
{ |
d6cbd281d [PATCH] Some clea... |
790 791 |
int error; int fdw, fdr; |
9883035ae pipes: add a "pac... |
792 |
if (flags & ~(O_CLOEXEC | O_NONBLOCK | O_DIRECT)) |
ed8cae8ba flag parameters: ... |
793 |
return -EINVAL; |
e4fad8e5d consolidate pipe ... |
794 795 796 |
error = create_pipe_files(files, flags); if (error) return error; |
d6cbd281d [PATCH] Some clea... |
797 |
|
ed8cae8ba flag parameters: ... |
798 |
error = get_unused_fd_flags(flags); |
d6cbd281d [PATCH] Some clea... |
799 800 801 |
if (error < 0) goto err_read_pipe; fdr = error; |
ed8cae8ba flag parameters: ... |
802 |
error = get_unused_fd_flags(flags); |
d6cbd281d [PATCH] Some clea... |
803 804 805 |
if (error < 0) goto err_fdr; fdw = error; |
157cf649a sanitize audit_fd... |
806 |
audit_fd_pair(fdr, fdw); |
d6cbd281d [PATCH] Some clea... |
807 808 |
fd[0] = fdr; fd[1] = fdw; |
d6cbd281d [PATCH] Some clea... |
809 810 811 812 813 |
return 0; err_fdr: put_unused_fd(fdr); err_read_pipe: |
e4fad8e5d consolidate pipe ... |
814 815 |
fput(files[0]); fput(files[1]); |
d6cbd281d [PATCH] Some clea... |
816 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
817 |
} |
5b249b1b0 pipe(2) - race-fr... |
818 819 820 821 822 823 824 825 826 827 |
int do_pipe_flags(int *fd, int flags) { struct file *files[2]; int error = __do_pipe_flags(fd, files, flags); if (!error) { fd_install(fd[0], files[0]); fd_install(fd[1], files[1]); } return error; } |
1da177e4c Linux-2.6.12-rc2 |
828 |
/* |
d35c7b0e5 unified (weak) sy... |
829 830 831 |
* sys_pipe() is the normal C calling standard for creating * a pipe. It's not the way Unix traditionally does this, though. */ |
d4e82042c [CVE-2009-0029] S... |
832 |
SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags) |
d35c7b0e5 unified (weak) sy... |
833 |
{ |
5b249b1b0 pipe(2) - race-fr... |
834 |
struct file *files[2]; |
d35c7b0e5 unified (weak) sy... |
835 836 |
int fd[2]; int error; |
5b249b1b0 pipe(2) - race-fr... |
837 |
error = __do_pipe_flags(fd, files, flags); |
d35c7b0e5 unified (weak) sy... |
838 |
if (!error) { |
5b249b1b0 pipe(2) - race-fr... |
839 840 841 842 843 |
if (unlikely(copy_to_user(fildes, fd, sizeof(fd)))) { fput(files[0]); fput(files[1]); put_unused_fd(fd[0]); put_unused_fd(fd[1]); |
d35c7b0e5 unified (weak) sy... |
844 |
error = -EFAULT; |
5b249b1b0 pipe(2) - race-fr... |
845 846 847 |
} else { fd_install(fd[0], files[0]); fd_install(fd[1], files[1]); |
ba719baea sys_pipe(): fix f... |
848 |
} |
d35c7b0e5 unified (weak) sy... |
849 850 851 |
} return error; } |
2b6642199 [CVE-2009-0029] S... |
852 |
SYSCALL_DEFINE1(pipe, int __user *, fildes) |
ed8cae8ba flag parameters: ... |
853 854 855 |
{ return sys_pipe2(fildes, 0); } |
fc7478a2b pipe: switch wait... |
856 |
static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt) |
f776c7388 fold fifo.c into ... |
857 858 859 860 |
{ int cur = *cnt; while (cur == *cnt) { |
fc7478a2b pipe: switch wait... |
861 |
pipe_wait(pipe); |
f776c7388 fold fifo.c into ... |
862 863 864 865 866 |
if (signal_pending(current)) break; } return cur == *cnt ? -ERESTARTSYS : 0; } |
fc7478a2b pipe: switch wait... |
867 |
static void wake_up_partner(struct pipe_inode_info *pipe) |
f776c7388 fold fifo.c into ... |
868 |
{ |
fc7478a2b pipe: switch wait... |
869 |
wake_up_interruptible(&pipe->wait); |
f776c7388 fold fifo.c into ... |
870 871 872 873 874 |
} static int fifo_open(struct inode *inode, struct file *filp) { struct pipe_inode_info *pipe; |
599a0ac14 pipe: fold file_o... |
875 |
bool is_pipe = inode->i_sb->s_magic == PIPEFS_MAGIC; |
f776c7388 fold fifo.c into ... |
876 |
int ret; |
ba5bb1473 pipe: take alloca... |
877 878 879 880 881 882 883 884 885 |
filp->f_version = 0; spin_lock(&inode->i_lock); if (inode->i_pipe) { pipe = inode->i_pipe; pipe->files++; spin_unlock(&inode->i_lock); } else { spin_unlock(&inode->i_lock); |
7bee130e2 get rid of alloc_... |
886 |
pipe = alloc_pipe_info(); |
f776c7388 fold fifo.c into ... |
887 |
if (!pipe) |
ba5bb1473 pipe: take alloca... |
888 889 890 891 892 893 |
return -ENOMEM; pipe->files = 1; spin_lock(&inode->i_lock); if (unlikely(inode->i_pipe)) { inode->i_pipe->files++; spin_unlock(&inode->i_lock); |
4b8a8f1e4 get rid of the la... |
894 |
free_pipe_info(pipe); |
ba5bb1473 pipe: take alloca... |
895 896 897 898 899 |
pipe = inode->i_pipe; } else { inode->i_pipe = pipe; spin_unlock(&inode->i_lock); } |
f776c7388 fold fifo.c into ... |
900 |
} |
de32ec4cf pipe: set file->p... |
901 |
filp->private_data = pipe; |
ba5bb1473 pipe: take alloca... |
902 |
/* OK, we have a pipe and it's pinned down */ |
ebec73f47 introduce variant... |
903 |
__pipe_lock(pipe); |
f776c7388 fold fifo.c into ... |
904 905 906 907 908 909 910 911 912 913 914 |
/* We can only do regular read/write on fifos */ filp->f_mode &= (FMODE_READ | FMODE_WRITE); switch (filp->f_mode) { case FMODE_READ: /* * O_RDONLY * POSIX.1 says that O_NONBLOCK means return with the FIFO * opened, even when there is no process writing the FIFO. */ |
f776c7388 fold fifo.c into ... |
915 916 |
pipe->r_counter++; if (pipe->readers++ == 0) |
fc7478a2b pipe: switch wait... |
917 |
wake_up_partner(pipe); |
f776c7388 fold fifo.c into ... |
918 |
|
599a0ac14 pipe: fold file_o... |
919 |
if (!is_pipe && !pipe->writers) { |
f776c7388 fold fifo.c into ... |
920 921 922 923 924 |
if ((filp->f_flags & O_NONBLOCK)) { /* suppress POLLHUP until we have * seen a writer */ filp->f_version = pipe->w_counter; } else { |
fc7478a2b pipe: switch wait... |
925 |
if (wait_for_partner(pipe, &pipe->w_counter)) |
f776c7388 fold fifo.c into ... |
926 927 928 929 930 931 932 933 934 935 936 937 |
goto err_rd; } } break; case FMODE_WRITE: /* * O_WRONLY * POSIX.1 says that O_NONBLOCK means return -1 with * errno=ENXIO when there is no process reading the FIFO. */ ret = -ENXIO; |
599a0ac14 pipe: fold file_o... |
938 |
if (!is_pipe && (filp->f_flags & O_NONBLOCK) && !pipe->readers) |
f776c7388 fold fifo.c into ... |
939 |
goto err; |
f776c7388 fold fifo.c into ... |
940 941 |
pipe->w_counter++; if (!pipe->writers++) |
fc7478a2b pipe: switch wait... |
942 |
wake_up_partner(pipe); |
f776c7388 fold fifo.c into ... |
943 |
|
599a0ac14 pipe: fold file_o... |
944 |
if (!is_pipe && !pipe->readers) { |
fc7478a2b pipe: switch wait... |
945 |
if (wait_for_partner(pipe, &pipe->r_counter)) |
f776c7388 fold fifo.c into ... |
946 947 948 949 950 951 952 953 954 955 956 |
goto err_wr; } break; case FMODE_READ | FMODE_WRITE: /* * O_RDWR * POSIX.1 leaves this case "undefined" when O_NONBLOCK is set. * This implementation will NEVER block on a O_RDWR open, since * the process can at least talk to itself. */ |
f776c7388 fold fifo.c into ... |
957 958 959 960 961 962 |
pipe->readers++; pipe->writers++; pipe->r_counter++; pipe->w_counter++; if (pipe->readers == 1 || pipe->writers == 1) |
fc7478a2b pipe: switch wait... |
963 |
wake_up_partner(pipe); |
f776c7388 fold fifo.c into ... |
964 965 966 967 968 969 970 971 |
break; default: ret = -EINVAL; goto err; } /* Ok! */ |
ebec73f47 introduce variant... |
972 |
__pipe_unlock(pipe); |
f776c7388 fold fifo.c into ... |
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 |
return 0; err_rd: if (!--pipe->readers) wake_up_interruptible(&pipe->wait); ret = -ERESTARTSYS; goto err; err_wr: if (!--pipe->writers) wake_up_interruptible(&pipe->wait); ret = -ERESTARTSYS; goto err; err: |
ebec73f47 introduce variant... |
988 |
__pipe_unlock(pipe); |
b0d8d2292 vfs: fix subtle u... |
989 990 |
put_pipe_info(inode, pipe); |
f776c7388 fold fifo.c into ... |
991 992 |
return ret; } |
599a0ac14 pipe: fold file_o... |
993 994 995 996 997 998 999 1000 1001 1002 1003 |
const struct file_operations pipefifo_fops = { .open = fifo_open, .llseek = no_llseek, .read = do_sync_read, .aio_read = pipe_read, .write = do_sync_write, .aio_write = pipe_write, .poll = pipe_poll, .unlocked_ioctl = pipe_ioctl, .release = pipe_release, .fasync = pipe_fasync, |
f776c7388 fold fifo.c into ... |
1004 |
}; |
d35c7b0e5 unified (weak) sy... |
1005 |
/* |
35f3d14db pipe: add support... |
1006 1007 1008 |
* Allocate a new array of pipe buffers and copy the info over. Returns the * pipe size if successful, or return -ERROR on error. */ |
b9598db34 pipe: make F_{GET... |
1009 |
static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long nr_pages) |
35f3d14db pipe: add support... |
1010 1011 1012 1013 |
{ struct pipe_buffer *bufs; /* |
35f3d14db pipe: add support... |
1014 1015 1016 1017 1018 |
* We can shrink the pipe, if arg >= pipe->nrbufs. Since we don't * expect a lot of shrink+grow operations, just free and allocate * again like we would do for growing. If the pipe currently * contains more buffers than arg, then return busy. */ |
b9598db34 pipe: make F_{GET... |
1019 |
if (nr_pages < pipe->nrbufs) |
35f3d14db pipe: add support... |
1020 |
return -EBUSY; |
2ccd4f4d4 pipe: fail cleanl... |
1021 |
bufs = kcalloc(nr_pages, sizeof(*bufs), GFP_KERNEL | __GFP_NOWARN); |
35f3d14db pipe: add support... |
1022 1023 1024 1025 1026 1027 1028 1029 |
if (unlikely(!bufs)) return -ENOMEM; /* * The pipe array wraps around, so just start the new one at zero * and adjust the indexes. */ if (pipe->nrbufs) { |
1d862f412 pipe: fix pipe bu... |
1030 1031 |
unsigned int tail; unsigned int head; |
35f3d14db pipe: add support... |
1032 |
|
1d862f412 pipe: fix pipe bu... |
1033 1034 1035 1036 1037 1038 1039 |
tail = pipe->curbuf + pipe->nrbufs; if (tail < pipe->buffers) tail = 0; else tail &= (pipe->buffers - 1); head = pipe->nrbufs - tail; |
35f3d14db pipe: add support... |
1040 1041 1042 |
if (head) memcpy(bufs, pipe->bufs + pipe->curbuf, head * sizeof(struct pipe_buffer)); if (tail) |
1d862f412 pipe: fix pipe bu... |
1043 |
memcpy(bufs + head, pipe->bufs, tail * sizeof(struct pipe_buffer)); |
35f3d14db pipe: add support... |
1044 1045 1046 1047 1048 |
} pipe->curbuf = 0; kfree(pipe->bufs); pipe->bufs = bufs; |
b9598db34 pipe: make F_{GET... |
1049 1050 |
pipe->buffers = nr_pages; return nr_pages * PAGE_SIZE; |
35f3d14db pipe: add support... |
1051 |
} |
ff9da691c pipe: change /pro... |
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 |
/* * Currently we rely on the pipe array holding a power-of-2 number * of pages. */ static inline unsigned int round_pipe_size(unsigned int size) { unsigned long nr_pages; nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; return roundup_pow_of_two(nr_pages) << PAGE_SHIFT; } /* * This should work even if CONFIG_PROC_FS isn't set, as proc_dointvec_minmax * will return an error. */ int pipe_proc_fn(struct ctl_table *table, int write, void __user *buf, size_t *lenp, loff_t *ppos) { int ret; ret = proc_dointvec_minmax(table, write, buf, lenp, ppos); if (ret < 0 || !write) return ret; pipe_max_size = round_pipe_size(pipe_max_size); return ret; } |
720836465 Un-inline get_pip... |
1080 1081 1082 1083 1084 1085 1086 |
/* * After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same * location, so checking ->i_pipe is not enough to verify that this is a * pipe. */ struct pipe_inode_info *get_pipe_info(struct file *file) { |
de32ec4cf pipe: set file->p... |
1087 |
return file->f_op == &pipefifo_fops ? file->private_data : NULL; |
720836465 Un-inline get_pip... |
1088 |
} |
35f3d14db pipe: add support... |
1089 1090 1091 1092 |
long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg) { struct pipe_inode_info *pipe; long ret; |
c66fb3479 Export 'get_pipe_... |
1093 |
pipe = get_pipe_info(file); |
35f3d14db pipe: add support... |
1094 1095 |
if (!pipe) return -EBADF; |
ebec73f47 introduce variant... |
1096 |
__pipe_lock(pipe); |
35f3d14db pipe: add support... |
1097 1098 |
switch (cmd) { |
b9598db34 pipe: make F_{GET... |
1099 |
case F_SETPIPE_SZ: { |
ff9da691c pipe: change /pro... |
1100 |
unsigned int size, nr_pages; |
b9598db34 pipe: make F_{GET... |
1101 |
|
ff9da691c pipe: change /pro... |
1102 1103 |
size = round_pipe_size(arg); nr_pages = size >> PAGE_SHIFT; |
b9598db34 pipe: make F_{GET... |
1104 |
|
6db40cf04 pipe: fix check i... |
1105 1106 1107 |
ret = -EINVAL; if (!nr_pages) goto out; |
ff9da691c pipe: change /pro... |
1108 |
if (!capable(CAP_SYS_RESOURCE) && size > pipe_max_size) { |
b4ca76157 Merge branch 'mas... |
1109 |
ret = -EPERM; |
cc967be54 fs: Add missing m... |
1110 |
goto out; |
cc967be54 fs: Add missing m... |
1111 |
} |
ff9da691c pipe: change /pro... |
1112 |
ret = pipe_set_size(pipe, nr_pages); |
35f3d14db pipe: add support... |
1113 |
break; |
b9598db34 pipe: make F_{GET... |
1114 |
} |
35f3d14db pipe: add support... |
1115 |
case F_GETPIPE_SZ: |
b9598db34 pipe: make F_{GET... |
1116 |
ret = pipe->buffers * PAGE_SIZE; |
35f3d14db pipe: add support... |
1117 1118 1119 1120 1121 |
break; default: ret = -EINVAL; break; } |
cc967be54 fs: Add missing m... |
1122 |
out: |
ebec73f47 introduce variant... |
1123 |
__pipe_unlock(pipe); |
35f3d14db pipe: add support... |
1124 1125 |
return ret; } |
ff0c7d15f fs: avoid inode R... |
1126 1127 |
static const struct super_operations pipefs_ops = { .destroy_inode = free_inode_nonrcu, |
d70ef97ba fs/pipe.c: add ->... |
1128 |
.statfs = simple_statfs, |
ff0c7d15f fs: avoid inode R... |
1129 |
}; |
35f3d14db pipe: add support... |
1130 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1131 1132 1133 1134 1135 |
* pipefs should _never_ be mounted by userland - too much of security hassle, * no real gain from having the whole whorehouse mounted. So we don't need * any operations on the root directory. However, we need a non-trivial * d_name - pipe: will go nicely and kill the special-casing in procfs. */ |
51139adac convert get_sb_ps... |
1136 1137 |
static struct dentry *pipefs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
1138 |
{ |
c74a1cbb3 pass default dent... |
1139 1140 |
return mount_pseudo(fs_type, "pipe:", &pipefs_ops, &pipefs_dentry_operations, PIPEFS_MAGIC); |
1da177e4c Linux-2.6.12-rc2 |
1141 1142 1143 1144 |
} static struct file_system_type pipe_fs_type = { .name = "pipefs", |
51139adac convert get_sb_ps... |
1145 |
.mount = pipefs_mount, |
1da177e4c Linux-2.6.12-rc2 |
1146 1147 1148 1149 1150 1151 |
.kill_sb = kill_anon_super, }; static int __init init_pipe_fs(void) { int err = register_filesystem(&pipe_fs_type); |
341b446bc [PATCH] another r... |
1152 |
|
1da177e4c Linux-2.6.12-rc2 |
1153 1154 1155 1156 1157 1158 1159 1160 1161 |
if (!err) { pipe_mnt = kern_mount(&pipe_fs_type); if (IS_ERR(pipe_mnt)) { err = PTR_ERR(pipe_mnt); unregister_filesystem(&pipe_fs_type); } } return err; } |
1da177e4c Linux-2.6.12-rc2 |
1162 |
fs_initcall(init_pipe_fs); |