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fs/pipe.c
27.7 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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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/memcontrol.h> |
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|
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#include <linux/uaccess.h> |
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#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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/* Maximum allocatable pages per user. Hard limit is unset by default, soft * matches default values. */ unsigned long pipe_user_pages_hard; unsigned long pipe_user_pages_soft = PIPE_DEF_BUFFERS * INR_OPEN_CUR; |
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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 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 |
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put_page(page); |
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} |
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static int anon_pipe_buf_steal(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { struct page *page = buf->page; if (page_count(page) == 1) { |
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if (memcg_kmem_enabled()) |
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memcg_kmem_uncharge(page, 0); |
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__SetPageLocked(page); return 0; } return 1; } |
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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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{ |
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get_page(buf->page); |
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} |
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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) { |
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put_page(buf->page); |
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} |
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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 = anon_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, |
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.steal = anon_pipe_buf_steal, |
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.get = generic_pipe_buf_get, }; |
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static ssize_t |
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pipe_read(struct kiocb *iocb, struct iov_iter *to) |
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{ |
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size_t total_len = iov_iter_count(to); |
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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; |
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|
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/* Null read succeeds. */ if (unlikely(total_len == 0)) return 0; 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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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 = pipe_buf_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, to); |
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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) { |
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pipe_buf_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, struct iov_iter *from) |
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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 = 0; int do_wakeup = 0; size_t total_len = iov_iter_count(from); |
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ssize_t chars; |
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/* Null write succeeds. */ if (unlikely(total_len == 0)) return 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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int offset = buf->offset + buf->len; |
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|
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if (buf->ops->can_merge && offset + chars <= PAGE_SIZE) { ret = pipe_buf_confirm(pipe, buf); |
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if (ret) |
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goto out; |
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|
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ret = copy_page_from_iter(buf->page, offset, chars, from); if (unlikely(ret < chars)) { |
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ret = -EFAULT; |
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goto out; |
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} |
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do_wakeup = 1; |
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buf->len += ret; |
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if (!iov_iter_count(from)) |
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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; |
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397 |
int copied; |
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if (!page) { |
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page = alloc_page(GFP_HIGHUSER | __GFP_ACCOUNT); |
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if (unlikely(!page)) { ret = ret ? : -ENOMEM; break; } |
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pipe->tmp_page = page; |
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} |
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/* Always wake up, even if the copy fails. Otherwise |
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* we lock up (O_NONBLOCK-)readers that sleep due to * syscall merging. * FIXME! Is this really true? */ do_wakeup = 1; |
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copied = copy_page_from_iter(page, 0, PAGE_SIZE, from); if (unlikely(copied < PAGE_SIZE && iov_iter_count(from))) { |
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415 |
if (!ret) |
f0d1bec9d new helper: copy_... |
416 |
ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
417 418 |
break; } |
f0d1bec9d new helper: copy_... |
419 |
ret += copied; |
1da177e4c Linux-2.6.12-rc2 |
420 421 422 423 424 |
/* Insert it into the buffer array */ buf->page = page; buf->ops = &anon_pipe_buf_ops; buf->offset = 0; |
f0d1bec9d new helper: copy_... |
425 |
buf->len = copied; |
9883035ae pipes: add a "pac... |
426 427 428 429 430 |
buf->flags = 0; if (is_packetized(filp)) { buf->ops = &packet_pipe_buf_ops; buf->flags = PIPE_BUF_FLAG_PACKET; } |
923f4f239 [PATCH] pipe.c/fi... |
431 432 |
pipe->nrbufs = ++bufs; pipe->tmp_page = NULL; |
1da177e4c Linux-2.6.12-rc2 |
433 |
|
f0d1bec9d new helper: copy_... |
434 |
if (!iov_iter_count(from)) |
1da177e4c Linux-2.6.12-rc2 |
435 436 |
break; } |
35f3d14db pipe: add support... |
437 |
if (bufs < pipe->buffers) |
1da177e4c Linux-2.6.12-rc2 |
438 439 |
continue; if (filp->f_flags & O_NONBLOCK) { |
341b446bc [PATCH] another r... |
440 441 |
if (!ret) ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
442 443 444 |
break; } if (signal_pending(current)) { |
341b446bc [PATCH] another r... |
445 446 |
if (!ret) ret = -ERESTARTSYS; |
1da177e4c Linux-2.6.12-rc2 |
447 448 449 |
break; } if (do_wakeup) { |
28e58ee8c Fix broken "pipe:... |
450 |
wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLRDNORM); |
923f4f239 [PATCH] pipe.c/fi... |
451 |
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
1da177e4c Linux-2.6.12-rc2 |
452 453 |
do_wakeup = 0; } |
923f4f239 [PATCH] pipe.c/fi... |
454 455 456 |
pipe->waiting_writers++; pipe_wait(pipe); pipe->waiting_writers--; |
1da177e4c Linux-2.6.12-rc2 |
457 458 |
} out: |
ebec73f47 introduce variant... |
459 |
__pipe_unlock(pipe); |
1da177e4c Linux-2.6.12-rc2 |
460 |
if (do_wakeup) { |
28e58ee8c Fix broken "pipe:... |
461 |
wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLRDNORM); |
923f4f239 [PATCH] pipe.c/fi... |
462 |
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
1da177e4c Linux-2.6.12-rc2 |
463 |
} |
7e775f46a fs/pipe.c: skip f... |
464 |
if (ret > 0 && sb_start_write_trylock(file_inode(filp)->i_sb)) { |
c3b2da314 fs: introduce ino... |
465 466 467 |
int err = file_update_time(filp); if (err) ret = err; |
7e775f46a fs/pipe.c: skip f... |
468 |
sb_end_write(file_inode(filp)->i_sb); |
c3b2da314 fs: introduce ino... |
469 |
} |
1da177e4c Linux-2.6.12-rc2 |
470 471 |
return ret; } |
d59d0b1b8 BKL-Removal: conv... |
472 |
static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
473 |
{ |
de32ec4cf pipe: set file->p... |
474 |
struct pipe_inode_info *pipe = filp->private_data; |
1da177e4c Linux-2.6.12-rc2 |
475 476 477 478 |
int count, buf, nrbufs; switch (cmd) { case FIONREAD: |
ebec73f47 introduce variant... |
479 |
__pipe_lock(pipe); |
1da177e4c Linux-2.6.12-rc2 |
480 |
count = 0; |
923f4f239 [PATCH] pipe.c/fi... |
481 482 |
buf = pipe->curbuf; nrbufs = pipe->nrbufs; |
1da177e4c Linux-2.6.12-rc2 |
483 |
while (--nrbufs >= 0) { |
923f4f239 [PATCH] pipe.c/fi... |
484 |
count += pipe->bufs[buf].len; |
35f3d14db pipe: add support... |
485 |
buf = (buf+1) & (pipe->buffers - 1); |
1da177e4c Linux-2.6.12-rc2 |
486 |
} |
ebec73f47 introduce variant... |
487 |
__pipe_unlock(pipe); |
923f4f239 [PATCH] pipe.c/fi... |
488 |
|
1da177e4c Linux-2.6.12-rc2 |
489 490 |
return put_user(count, (int __user *)arg); default: |
46ce341b2 pipe: return -ENO... |
491 |
return -ENOIOCTLCMD; |
1da177e4c Linux-2.6.12-rc2 |
492 493 494 495 496 497 498 499 |
} } /* No kernel lock held - fine */ static unsigned int pipe_poll(struct file *filp, poll_table *wait) { unsigned int mask; |
de32ec4cf pipe: set file->p... |
500 |
struct pipe_inode_info *pipe = filp->private_data; |
1da177e4c Linux-2.6.12-rc2 |
501 |
int nrbufs; |
923f4f239 [PATCH] pipe.c/fi... |
502 |
poll_wait(filp, &pipe->wait, wait); |
1da177e4c Linux-2.6.12-rc2 |
503 504 |
/* Reading only -- no need for acquiring the semaphore. */ |
923f4f239 [PATCH] pipe.c/fi... |
505 |
nrbufs = pipe->nrbufs; |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 |
mask = 0; if (filp->f_mode & FMODE_READ) { mask = (nrbufs > 0) ? POLLIN | POLLRDNORM : 0; |
923f4f239 [PATCH] pipe.c/fi... |
509 |
if (!pipe->writers && filp->f_version != pipe->w_counter) |
1da177e4c Linux-2.6.12-rc2 |
510 511 512 513 |
mask |= POLLHUP; } if (filp->f_mode & FMODE_WRITE) { |
35f3d14db pipe: add support... |
514 |
mask |= (nrbufs < pipe->buffers) ? POLLOUT | POLLWRNORM : 0; |
5e5d7a222 [PATCH] pipe: rem... |
515 516 517 518 |
/* * Most Unices do not set POLLERR for FIFOs but on Linux they * behave exactly like pipes for poll(). */ |
923f4f239 [PATCH] pipe.c/fi... |
519 |
if (!pipe->readers) |
1da177e4c Linux-2.6.12-rc2 |
520 521 522 523 524 |
mask |= POLLERR; } return mask; } |
b0d8d2292 vfs: fix subtle u... |
525 526 527 528 529 530 531 532 533 534 535 536 537 538 |
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 |
539 |
static int |
599a0ac14 pipe: fold file_o... |
540 |
pipe_release(struct inode *inode, struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
541 |
{ |
b0d8d2292 vfs: fix subtle u... |
542 |
struct pipe_inode_info *pipe = file->private_data; |
923f4f239 [PATCH] pipe.c/fi... |
543 |
|
ebec73f47 introduce variant... |
544 |
__pipe_lock(pipe); |
599a0ac14 pipe: fold file_o... |
545 546 547 548 |
if (file->f_mode & FMODE_READ) pipe->readers--; if (file->f_mode & FMODE_WRITE) pipe->writers--; |
341b446bc [PATCH] another r... |
549 |
|
ba5bb1473 pipe: take alloca... |
550 |
if (pipe->readers || pipe->writers) { |
28e58ee8c Fix broken "pipe:... |
551 |
wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM | POLLERR | POLLHUP); |
923f4f239 [PATCH] pipe.c/fi... |
552 553 |
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); |
1da177e4c Linux-2.6.12-rc2 |
554 |
} |
ebec73f47 introduce variant... |
555 |
__pipe_unlock(pipe); |
ba5bb1473 pipe: take alloca... |
556 |
|
b0d8d2292 vfs: fix subtle u... |
557 |
put_pipe_info(inode, pipe); |
1da177e4c Linux-2.6.12-rc2 |
558 559 560 561 |
return 0; } static int |
599a0ac14 pipe: fold file_o... |
562 |
pipe_fasync(int fd, struct file *filp, int on) |
1da177e4c Linux-2.6.12-rc2 |
563 |
{ |
de32ec4cf pipe: set file->p... |
564 |
struct pipe_inode_info *pipe = filp->private_data; |
599a0ac14 pipe: fold file_o... |
565 |
int retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
566 |
|
ebec73f47 introduce variant... |
567 |
__pipe_lock(pipe); |
599a0ac14 pipe: fold file_o... |
568 569 570 |
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... |
571 |
retval = fasync_helper(fd, filp, on, &pipe->fasync_writers); |
599a0ac14 pipe: fold file_o... |
572 573 |
if (retval < 0 && (filp->f_mode & FMODE_READ)) /* this can happen only if on == T */ |
e5bc49ba7 pipe_rdwr_fasync:... |
574 575 |
fasync_helper(-1, filp, 0, &pipe->fasync_readers); } |
ebec73f47 introduce variant... |
576 |
__pipe_unlock(pipe); |
60aa49243 Rationalize fasyn... |
577 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
578 |
} |
9c87bcf0a pipe: make accoun... |
579 |
static unsigned long account_pipe_buffers(struct user_struct *user, |
759c01142 pipe: limit the p... |
580 581 |
unsigned long old, unsigned long new) { |
9c87bcf0a pipe: make accoun... |
582 |
return atomic_long_add_return(new - old, &user->pipe_bufs); |
759c01142 pipe: limit the p... |
583 |
} |
9c87bcf0a pipe: make accoun... |
584 |
static bool too_many_pipe_buffers_soft(unsigned long user_bufs) |
759c01142 pipe: limit the p... |
585 |
{ |
703b37d84 pipe: fix off-by-... |
586 |
return pipe_user_pages_soft && user_bufs > pipe_user_pages_soft; |
759c01142 pipe: limit the p... |
587 |
} |
9c87bcf0a pipe: make accoun... |
588 |
static bool too_many_pipe_buffers_hard(unsigned long user_bufs) |
759c01142 pipe: limit the p... |
589 |
{ |
703b37d84 pipe: fix off-by-... |
590 |
return pipe_user_pages_hard && user_bufs > pipe_user_pages_hard; |
759c01142 pipe: limit the p... |
591 |
} |
a125e9a42 pipe: actually al... |
592 593 594 595 |
static bool is_unprivileged_user(void) { return !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN); } |
7bee130e2 get rid of alloc_... |
596 |
struct pipe_inode_info *alloc_pipe_info(void) |
3a326a2ce [PATCH] introduce... |
597 |
{ |
923f4f239 [PATCH] pipe.c/fi... |
598 |
struct pipe_inode_info *pipe; |
09b4d1990 pipe: simplify lo... |
599 600 |
unsigned long pipe_bufs = PIPE_DEF_BUFFERS; struct user_struct *user = get_current_user(); |
9c87bcf0a pipe: make accoun... |
601 |
unsigned long user_bufs; |
3a326a2ce [PATCH] introduce... |
602 |
|
d86133bd3 pipe: account to ... |
603 |
pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL_ACCOUNT); |
09b4d1990 pipe: simplify lo... |
604 605 |
if (pipe == NULL) goto out_free_uid; |
086e774a5 pipe: cap initial... |
606 607 |
if (pipe_bufs * PAGE_SIZE > pipe_max_size && !capable(CAP_SYS_RESOURCE)) pipe_bufs = pipe_max_size >> PAGE_SHIFT; |
9c87bcf0a pipe: make accoun... |
608 |
user_bufs = account_pipe_buffers(user, 0, pipe_bufs); |
a005ca0e6 pipe: fix limit c... |
609 |
|
a125e9a42 pipe: actually al... |
610 |
if (too_many_pipe_buffers_soft(user_bufs) && is_unprivileged_user()) { |
9c87bcf0a pipe: make accoun... |
611 |
user_bufs = account_pipe_buffers(user, pipe_bufs, 1); |
a005ca0e6 pipe: fix limit c... |
612 |
pipe_bufs = 1; |
09b4d1990 pipe: simplify lo... |
613 |
} |
759c01142 pipe: limit the p... |
614 |
|
a125e9a42 pipe: actually al... |
615 |
if (too_many_pipe_buffers_hard(user_bufs) && is_unprivileged_user()) |
a005ca0e6 pipe: fix limit c... |
616 617 618 619 |
goto out_revert_acct; pipe->bufs = kcalloc(pipe_bufs, sizeof(struct pipe_buffer), GFP_KERNEL_ACCOUNT); |
09b4d1990 pipe: simplify lo... |
620 621 622 623 624 |
if (pipe->bufs) { init_waitqueue_head(&pipe->wait); pipe->r_counter = pipe->w_counter = 1; pipe->buffers = pipe_bufs; pipe->user = user; |
09b4d1990 pipe: simplify lo... |
625 626 |
mutex_init(&pipe->mutex); return pipe; |
3a326a2ce [PATCH] introduce... |
627 |
} |
a005ca0e6 pipe: fix limit c... |
628 |
out_revert_acct: |
9c87bcf0a pipe: make accoun... |
629 |
(void) account_pipe_buffers(user, pipe_bufs, 0); |
09b4d1990 pipe: simplify lo... |
630 631 632 |
kfree(pipe); out_free_uid: free_uid(user); |
35f3d14db pipe: add support... |
633 |
return NULL; |
3a326a2ce [PATCH] introduce... |
634 |
} |
4b8a8f1e4 get rid of the la... |
635 |
void free_pipe_info(struct pipe_inode_info *pipe) |
1da177e4c Linux-2.6.12-rc2 |
636 637 |
{ int i; |
1da177e4c Linux-2.6.12-rc2 |
638 |
|
9c87bcf0a pipe: make accoun... |
639 |
(void) account_pipe_buffers(pipe->user, pipe->buffers, 0); |
759c01142 pipe: limit the p... |
640 |
free_uid(pipe->user); |
35f3d14db pipe: add support... |
641 |
for (i = 0; i < pipe->buffers; i++) { |
923f4f239 [PATCH] pipe.c/fi... |
642 |
struct pipe_buffer *buf = pipe->bufs + i; |
1da177e4c Linux-2.6.12-rc2 |
643 |
if (buf->ops) |
a779638cf pipe: add pipe_bu... |
644 |
pipe_buf_release(pipe, buf); |
1da177e4c Linux-2.6.12-rc2 |
645 |
} |
923f4f239 [PATCH] pipe.c/fi... |
646 647 |
if (pipe->tmp_page) __free_page(pipe->tmp_page); |
35f3d14db pipe: add support... |
648 |
kfree(pipe->bufs); |
923f4f239 [PATCH] pipe.c/fi... |
649 |
kfree(pipe); |
1da177e4c Linux-2.6.12-rc2 |
650 |
} |
fa3536cc1 [PATCH] Use __rea... |
651 |
static struct vfsmount *pipe_mnt __read_mostly; |
341b446bc [PATCH] another r... |
652 |
|
c23fbb6bc VFS: delay the de... |
653 654 655 656 657 658 |
/* * 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]", |
75c3cfa85 VFS: assorted wei... |
659 |
d_inode(dentry)->i_ino); |
c23fbb6bc VFS: delay the de... |
660 |
} |
3ba13d179 constify dentry_o... |
661 |
static const struct dentry_operations pipefs_dentry_operations = { |
c23fbb6bc VFS: delay the de... |
662 |
.d_dname = pipefs_dname, |
1da177e4c Linux-2.6.12-rc2 |
663 664 665 666 |
}; static struct inode * get_pipe_inode(void) { |
a209dfc7b vfs: dont chain p... |
667 |
struct inode *inode = new_inode_pseudo(pipe_mnt->mnt_sb); |
923f4f239 [PATCH] pipe.c/fi... |
668 |
struct pipe_inode_info *pipe; |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 |
if (!inode) goto fail_inode; |
85fe4025c fs: do not assign... |
672 |
inode->i_ino = get_next_ino(); |
7bee130e2 get rid of alloc_... |
673 |
pipe = alloc_pipe_info(); |
923f4f239 [PATCH] pipe.c/fi... |
674 |
if (!pipe) |
1da177e4c Linux-2.6.12-rc2 |
675 |
goto fail_iput; |
3a326a2ce [PATCH] introduce... |
676 |
|
ba5bb1473 pipe: take alloca... |
677 678 |
inode->i_pipe = pipe; pipe->files = 2; |
923f4f239 [PATCH] pipe.c/fi... |
679 |
pipe->readers = pipe->writers = 1; |
599a0ac14 pipe: fold file_o... |
680 |
inode->i_fop = &pipefifo_fops; |
1da177e4c Linux-2.6.12-rc2 |
681 682 683 684 685 686 687 688 689 |
/* * 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... |
690 691 |
inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); |
078cd8279 fs: Replace CURRE... |
692 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
923f4f239 [PATCH] pipe.c/fi... |
693 |
|
1da177e4c Linux-2.6.12-rc2 |
694 695 696 697 |
return inode; fail_iput: iput(inode); |
341b446bc [PATCH] another r... |
698 |
|
1da177e4c Linux-2.6.12-rc2 |
699 700 701 |
fail_inode: return NULL; } |
e4fad8e5d consolidate pipe ... |
702 |
int create_pipe_files(struct file **res, int flags) |
1da177e4c Linux-2.6.12-rc2 |
703 |
{ |
d6cbd281d [PATCH] Some clea... |
704 |
int err; |
e4fad8e5d consolidate pipe ... |
705 |
struct inode *inode = get_pipe_inode(); |
d6cbd281d [PATCH] Some clea... |
706 |
struct file *f; |
2c48b9c45 switch alloc_file... |
707 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
708 |
|
1da177e4c Linux-2.6.12-rc2 |
709 |
if (!inode) |
e4fad8e5d consolidate pipe ... |
710 |
return -ENFILE; |
1da177e4c Linux-2.6.12-rc2 |
711 |
|
d6cbd281d [PATCH] Some clea... |
712 |
err = -ENOMEM; |
cdf01226b VFS: Provide empt... |
713 |
path.dentry = d_alloc_pseudo(pipe_mnt->mnt_sb, &empty_name); |
2c48b9c45 switch alloc_file... |
714 |
if (!path.dentry) |
d6cbd281d [PATCH] Some clea... |
715 |
goto err_inode; |
2c48b9c45 switch alloc_file... |
716 |
path.mnt = mntget(pipe_mnt); |
341b446bc [PATCH] another r... |
717 |
|
2c48b9c45 switch alloc_file... |
718 |
d_instantiate(path.dentry, inode); |
430e285e0 [PATCH] fix up ne... |
719 |
|
599a0ac14 pipe: fold file_o... |
720 |
f = alloc_file(&path, FMODE_WRITE, &pipefifo_fops); |
e9bb1f9b1 fs/pipe.c: preser... |
721 722 |
if (IS_ERR(f)) { err = PTR_ERR(f); |
430e285e0 [PATCH] fix up ne... |
723 |
goto err_dentry; |
e9bb1f9b1 fs/pipe.c: preser... |
724 |
} |
341b446bc [PATCH] another r... |
725 |
|
9883035ae pipes: add a "pac... |
726 |
f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT)); |
de32ec4cf pipe: set file->p... |
727 |
f->private_data = inode->i_pipe; |
d6cbd281d [PATCH] Some clea... |
728 |
|
599a0ac14 pipe: fold file_o... |
729 |
res[0] = alloc_file(&path, FMODE_READ, &pipefifo_fops); |
e9bb1f9b1 fs/pipe.c: preser... |
730 731 |
if (IS_ERR(res[0])) { err = PTR_ERR(res[0]); |
e4fad8e5d consolidate pipe ... |
732 |
goto err_file; |
e9bb1f9b1 fs/pipe.c: preser... |
733 |
} |
e4fad8e5d consolidate pipe ... |
734 735 |
path_get(&path); |
de32ec4cf pipe: set file->p... |
736 |
res[0]->private_data = inode->i_pipe; |
e4fad8e5d consolidate pipe ... |
737 738 739 |
res[0]->f_flags = O_RDONLY | (flags & O_NONBLOCK); res[1] = f; return 0; |
1da177e4c Linux-2.6.12-rc2 |
740 |
|
e4fad8e5d consolidate pipe ... |
741 742 743 |
err_file: put_filp(f); err_dentry: |
4b8a8f1e4 get rid of the la... |
744 |
free_pipe_info(inode->i_pipe); |
2c48b9c45 switch alloc_file... |
745 |
path_put(&path); |
e4fad8e5d consolidate pipe ... |
746 |
return err; |
ed1524371 [PATCH] double-fr... |
747 |
|
e4fad8e5d consolidate pipe ... |
748 |
err_inode: |
4b8a8f1e4 get rid of the la... |
749 |
free_pipe_info(inode->i_pipe); |
1da177e4c Linux-2.6.12-rc2 |
750 |
iput(inode); |
e4fad8e5d consolidate pipe ... |
751 |
return err; |
d6cbd281d [PATCH] Some clea... |
752 |
} |
5b249b1b0 pipe(2) - race-fr... |
753 |
static int __do_pipe_flags(int *fd, struct file **files, int flags) |
d6cbd281d [PATCH] Some clea... |
754 |
{ |
d6cbd281d [PATCH] Some clea... |
755 756 |
int error; int fdw, fdr; |
9883035ae pipes: add a "pac... |
757 |
if (flags & ~(O_CLOEXEC | O_NONBLOCK | O_DIRECT)) |
ed8cae8ba flag parameters: ... |
758 |
return -EINVAL; |
e4fad8e5d consolidate pipe ... |
759 760 761 |
error = create_pipe_files(files, flags); if (error) return error; |
d6cbd281d [PATCH] Some clea... |
762 |
|
ed8cae8ba flag parameters: ... |
763 |
error = get_unused_fd_flags(flags); |
d6cbd281d [PATCH] Some clea... |
764 765 766 |
if (error < 0) goto err_read_pipe; fdr = error; |
ed8cae8ba flag parameters: ... |
767 |
error = get_unused_fd_flags(flags); |
d6cbd281d [PATCH] Some clea... |
768 769 770 |
if (error < 0) goto err_fdr; fdw = error; |
157cf649a sanitize audit_fd... |
771 |
audit_fd_pair(fdr, fdw); |
d6cbd281d [PATCH] Some clea... |
772 773 |
fd[0] = fdr; fd[1] = fdw; |
d6cbd281d [PATCH] Some clea... |
774 775 776 777 778 |
return 0; err_fdr: put_unused_fd(fdr); err_read_pipe: |
e4fad8e5d consolidate pipe ... |
779 780 |
fput(files[0]); fput(files[1]); |
d6cbd281d [PATCH] Some clea... |
781 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
782 |
} |
5b249b1b0 pipe(2) - race-fr... |
783 784 785 786 787 788 789 790 791 792 |
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 |
793 |
/* |
d35c7b0e5 unified (weak) sy... |
794 795 796 |
* 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... |
797 |
SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags) |
d35c7b0e5 unified (weak) sy... |
798 |
{ |
5b249b1b0 pipe(2) - race-fr... |
799 |
struct file *files[2]; |
d35c7b0e5 unified (weak) sy... |
800 801 |
int fd[2]; int error; |
5b249b1b0 pipe(2) - race-fr... |
802 |
error = __do_pipe_flags(fd, files, flags); |
d35c7b0e5 unified (weak) sy... |
803 |
if (!error) { |
5b249b1b0 pipe(2) - race-fr... |
804 805 806 807 808 |
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... |
809 |
error = -EFAULT; |
5b249b1b0 pipe(2) - race-fr... |
810 811 812 |
} else { fd_install(fd[0], files[0]); fd_install(fd[1], files[1]); |
ba719baea sys_pipe(): fix f... |
813 |
} |
d35c7b0e5 unified (weak) sy... |
814 815 816 |
} return error; } |
2b6642199 [CVE-2009-0029] S... |
817 |
SYSCALL_DEFINE1(pipe, int __user *, fildes) |
ed8cae8ba flag parameters: ... |
818 819 820 |
{ return sys_pipe2(fildes, 0); } |
fc7478a2b pipe: switch wait... |
821 |
static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt) |
f776c7388 fold fifo.c into ... |
822 823 824 825 |
{ int cur = *cnt; while (cur == *cnt) { |
fc7478a2b pipe: switch wait... |
826 |
pipe_wait(pipe); |
f776c7388 fold fifo.c into ... |
827 828 829 830 831 |
if (signal_pending(current)) break; } return cur == *cnt ? -ERESTARTSYS : 0; } |
fc7478a2b pipe: switch wait... |
832 |
static void wake_up_partner(struct pipe_inode_info *pipe) |
f776c7388 fold fifo.c into ... |
833 |
{ |
fc7478a2b pipe: switch wait... |
834 |
wake_up_interruptible(&pipe->wait); |
f776c7388 fold fifo.c into ... |
835 836 837 838 839 |
} static int fifo_open(struct inode *inode, struct file *filp) { struct pipe_inode_info *pipe; |
599a0ac14 pipe: fold file_o... |
840 |
bool is_pipe = inode->i_sb->s_magic == PIPEFS_MAGIC; |
f776c7388 fold fifo.c into ... |
841 |
int ret; |
ba5bb1473 pipe: take alloca... |
842 843 844 845 846 847 848 849 850 |
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_... |
851 |
pipe = alloc_pipe_info(); |
f776c7388 fold fifo.c into ... |
852 |
if (!pipe) |
ba5bb1473 pipe: take alloca... |
853 854 855 856 857 858 |
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... |
859 |
free_pipe_info(pipe); |
ba5bb1473 pipe: take alloca... |
860 861 862 863 864 |
pipe = inode->i_pipe; } else { inode->i_pipe = pipe; spin_unlock(&inode->i_lock); } |
f776c7388 fold fifo.c into ... |
865 |
} |
de32ec4cf pipe: set file->p... |
866 |
filp->private_data = pipe; |
ba5bb1473 pipe: take alloca... |
867 |
/* OK, we have a pipe and it's pinned down */ |
ebec73f47 introduce variant... |
868 |
__pipe_lock(pipe); |
f776c7388 fold fifo.c into ... |
869 870 871 872 873 874 875 876 877 878 879 |
/* 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 ... |
880 881 |
pipe->r_counter++; if (pipe->readers++ == 0) |
fc7478a2b pipe: switch wait... |
882 |
wake_up_partner(pipe); |
f776c7388 fold fifo.c into ... |
883 |
|
599a0ac14 pipe: fold file_o... |
884 |
if (!is_pipe && !pipe->writers) { |
f776c7388 fold fifo.c into ... |
885 886 887 888 889 |
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... |
890 |
if (wait_for_partner(pipe, &pipe->w_counter)) |
f776c7388 fold fifo.c into ... |
891 892 893 894 895 896 897 898 899 900 901 902 |
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... |
903 |
if (!is_pipe && (filp->f_flags & O_NONBLOCK) && !pipe->readers) |
f776c7388 fold fifo.c into ... |
904 |
goto err; |
f776c7388 fold fifo.c into ... |
905 906 |
pipe->w_counter++; if (!pipe->writers++) |
fc7478a2b pipe: switch wait... |
907 |
wake_up_partner(pipe); |
f776c7388 fold fifo.c into ... |
908 |
|
599a0ac14 pipe: fold file_o... |
909 |
if (!is_pipe && !pipe->readers) { |
fc7478a2b pipe: switch wait... |
910 |
if (wait_for_partner(pipe, &pipe->r_counter)) |
f776c7388 fold fifo.c into ... |
911 912 913 914 915 916 917 918 919 920 921 |
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 ... |
922 923 924 925 926 927 |
pipe->readers++; pipe->writers++; pipe->r_counter++; pipe->w_counter++; if (pipe->readers == 1 || pipe->writers == 1) |
fc7478a2b pipe: switch wait... |
928 |
wake_up_partner(pipe); |
f776c7388 fold fifo.c into ... |
929 930 931 932 933 934 935 936 |
break; default: ret = -EINVAL; goto err; } /* Ok! */ |
ebec73f47 introduce variant... |
937 |
__pipe_unlock(pipe); |
f776c7388 fold fifo.c into ... |
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 |
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... |
953 |
__pipe_unlock(pipe); |
b0d8d2292 vfs: fix subtle u... |
954 955 |
put_pipe_info(inode, pipe); |
f776c7388 fold fifo.c into ... |
956 957 |
return ret; } |
599a0ac14 pipe: fold file_o... |
958 959 960 |
const struct file_operations pipefifo_fops = { .open = fifo_open, .llseek = no_llseek, |
fb9096a34 pipe: switch to -... |
961 |
.read_iter = pipe_read, |
f0d1bec9d new helper: copy_... |
962 |
.write_iter = pipe_write, |
599a0ac14 pipe: fold file_o... |
963 964 965 966 |
.poll = pipe_poll, .unlocked_ioctl = pipe_ioctl, .release = pipe_release, .fasync = pipe_fasync, |
f776c7388 fold fifo.c into ... |
967 |
}; |
d35c7b0e5 unified (weak) sy... |
968 |
/* |
f491bd711 pipe: relocate ro... |
969 |
* Currently we rely on the pipe array holding a power-of-2 number |
e109607e1 pipe: avoid round... |
970 |
* of pages. Returns 0 on error. |
f491bd711 pipe: relocate ro... |
971 972 973 974 |
*/ static inline unsigned int round_pipe_size(unsigned int size) { unsigned long nr_pages; |
e109607e1 pipe: avoid round... |
975 976 |
if (size < pipe_min_size) size = pipe_min_size; |
f491bd711 pipe: relocate ro... |
977 |
nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e109607e1 pipe: avoid round... |
978 979 |
if (nr_pages == 0) return 0; |
f491bd711 pipe: relocate ro... |
980 981 982 983 |
return roundup_pow_of_two(nr_pages) << PAGE_SHIFT; } /* |
35f3d14db pipe: add support... |
984 985 986 |
* Allocate a new array of pipe buffers and copy the info over. Returns the * pipe size if successful, or return -ERROR on error. */ |
d37d41666 pipe: move limit ... |
987 |
static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg) |
35f3d14db pipe: add support... |
988 989 |
{ struct pipe_buffer *bufs; |
d37d41666 pipe: move limit ... |
990 |
unsigned int size, nr_pages; |
9c87bcf0a pipe: make accoun... |
991 |
unsigned long user_bufs; |
b0b91d18e pipe: fix limit c... |
992 |
long ret = 0; |
d37d41666 pipe: move limit ... |
993 994 |
size = round_pipe_size(arg); |
e109607e1 pipe: avoid round... |
995 996 |
if (size == 0) return -EINVAL; |
d37d41666 pipe: move limit ... |
997 998 999 1000 |
nr_pages = size >> PAGE_SHIFT; if (!nr_pages) return -EINVAL; |
b0b91d18e pipe: fix limit c... |
1001 1002 1003 1004 1005 1006 1007 1008 1009 |
/* * If trying to increase the pipe capacity, check that an * unprivileged user is not trying to exceed various limits * (soft limit check here, hard limit check just below). * Decreasing the pipe capacity is always permitted, even * if the user is currently over a limit. */ if (nr_pages > pipe->buffers && size > pipe_max_size && !capable(CAP_SYS_RESOURCE)) |
d37d41666 pipe: move limit ... |
1010 |
return -EPERM; |
9c87bcf0a pipe: make accoun... |
1011 |
user_bufs = account_pipe_buffers(pipe->user, pipe->buffers, nr_pages); |
b0b91d18e pipe: fix limit c... |
1012 1013 |
if (nr_pages > pipe->buffers && |
9c87bcf0a pipe: make accoun... |
1014 1015 |
(too_many_pipe_buffers_hard(user_bufs) || too_many_pipe_buffers_soft(user_bufs)) && |
a125e9a42 pipe: actually al... |
1016 |
is_unprivileged_user()) { |
b0b91d18e pipe: fix limit c... |
1017 1018 1019 |
ret = -EPERM; goto out_revert_acct; } |
35f3d14db pipe: add support... |
1020 1021 |
/* |
35f3d14db pipe: add support... |
1022 1023 1024 1025 1026 |
* 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. */ |
b0b91d18e pipe: fix limit c... |
1027 1028 1029 1030 |
if (nr_pages < pipe->nrbufs) { ret = -EBUSY; goto out_revert_acct; } |
35f3d14db pipe: add support... |
1031 |
|
d86133bd3 pipe: account to ... |
1032 1033 |
bufs = kcalloc(nr_pages, sizeof(*bufs), GFP_KERNEL_ACCOUNT | __GFP_NOWARN); |
b0b91d18e pipe: fix limit c... |
1034 1035 1036 1037 |
if (unlikely(!bufs)) { ret = -ENOMEM; goto out_revert_acct; } |
35f3d14db pipe: add support... |
1038 1039 1040 1041 1042 1043 |
/* * 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... |
1044 1045 |
unsigned int tail; unsigned int head; |
35f3d14db pipe: add support... |
1046 |
|
1d862f412 pipe: fix pipe bu... |
1047 1048 1049 1050 1051 1052 1053 |
tail = pipe->curbuf + pipe->nrbufs; if (tail < pipe->buffers) tail = 0; else tail &= (pipe->buffers - 1); head = pipe->nrbufs - tail; |
35f3d14db pipe: add support... |
1054 1055 1056 |
if (head) memcpy(bufs, pipe->bufs + pipe->curbuf, head * sizeof(struct pipe_buffer)); if (tail) |
1d862f412 pipe: fix pipe bu... |
1057 |
memcpy(bufs + head, pipe->bufs, tail * sizeof(struct pipe_buffer)); |
35f3d14db pipe: add support... |
1058 1059 1060 1061 1062 |
} pipe->curbuf = 0; kfree(pipe->bufs); pipe->bufs = bufs; |
b9598db34 pipe: make F_{GET... |
1063 1064 |
pipe->buffers = nr_pages; return nr_pages * PAGE_SIZE; |
b0b91d18e pipe: fix limit c... |
1065 1066 |
out_revert_acct: |
9c87bcf0a pipe: make accoun... |
1067 |
(void) account_pipe_buffers(pipe->user, nr_pages, pipe->buffers); |
b0b91d18e pipe: fix limit c... |
1068 |
return ret; |
35f3d14db pipe: add support... |
1069 |
} |
ff9da691c pipe: change /pro... |
1070 |
/* |
ff9da691c pipe: change /pro... |
1071 1072 1073 1074 1075 1076 |
* 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) { |
e109607e1 pipe: avoid round... |
1077 |
unsigned int rounded_pipe_max_size; |
ff9da691c pipe: change /pro... |
1078 |
int ret; |
30c2f774e pipe: match pipe_... |
1079 |
ret = proc_douintvec_minmax(table, write, buf, lenp, ppos); |
ff9da691c pipe: change /pro... |
1080 1081 |
if (ret < 0 || !write) return ret; |
e109607e1 pipe: avoid round... |
1082 1083 1084 1085 1086 |
rounded_pipe_max_size = round_pipe_size(pipe_max_size); if (rounded_pipe_max_size == 0) return -EINVAL; pipe_max_size = rounded_pipe_max_size; |
ff9da691c pipe: change /pro... |
1087 1088 |
return ret; } |
720836465 Un-inline get_pip... |
1089 1090 1091 1092 1093 1094 1095 |
/* * 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... |
1096 |
return file->f_op == &pipefifo_fops ? file->private_data : NULL; |
720836465 Un-inline get_pip... |
1097 |
} |
35f3d14db pipe: add support... |
1098 1099 1100 1101 |
long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg) { struct pipe_inode_info *pipe; long ret; |
c66fb3479 Export 'get_pipe_... |
1102 |
pipe = get_pipe_info(file); |
35f3d14db pipe: add support... |
1103 1104 |
if (!pipe) return -EBADF; |
ebec73f47 introduce variant... |
1105 |
__pipe_lock(pipe); |
35f3d14db pipe: add support... |
1106 1107 |
switch (cmd) { |
d37d41666 pipe: move limit ... |
1108 1109 |
case F_SETPIPE_SZ: ret = pipe_set_size(pipe, arg); |
35f3d14db pipe: add support... |
1110 1111 |
break; case F_GETPIPE_SZ: |
b9598db34 pipe: make F_{GET... |
1112 |
ret = pipe->buffers * PAGE_SIZE; |
35f3d14db pipe: add support... |
1113 1114 1115 1116 1117 |
break; default: ret = -EINVAL; break; } |
ebec73f47 introduce variant... |
1118 |
__pipe_unlock(pipe); |
35f3d14db pipe: add support... |
1119 1120 |
return ret; } |
ff0c7d15f fs: avoid inode R... |
1121 1122 |
static const struct super_operations pipefs_ops = { .destroy_inode = free_inode_nonrcu, |
d70ef97ba fs/pipe.c: add ->... |
1123 |
.statfs = simple_statfs, |
ff0c7d15f fs: avoid inode R... |
1124 |
}; |
35f3d14db pipe: add support... |
1125 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1126 1127 1128 1129 1130 |
* 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... |
1131 1132 |
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 |
1133 |
{ |
c74a1cbb3 pass default dent... |
1134 1135 |
return mount_pseudo(fs_type, "pipe:", &pipefs_ops, &pipefs_dentry_operations, PIPEFS_MAGIC); |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 1138 1139 |
} static struct file_system_type pipe_fs_type = { .name = "pipefs", |
51139adac convert get_sb_ps... |
1140 |
.mount = pipefs_mount, |
1da177e4c Linux-2.6.12-rc2 |
1141 1142 1143 1144 1145 1146 |
.kill_sb = kill_anon_super, }; static int __init init_pipe_fs(void) { int err = register_filesystem(&pipe_fs_type); |
341b446bc [PATCH] another r... |
1147 |
|
1da177e4c Linux-2.6.12-rc2 |
1148 1149 1150 1151 1152 1153 1154 1155 1156 |
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 |
1157 |
fs_initcall(init_pipe_fs); |