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![Andy Shevchenko](/assets/img/avatar_default.png)
Move seq_escape() to the header as inliner, for a small kernel text size reduction. Link: https://lkml.kernel.org/r/20211001122917.67228-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1118 lines
25 KiB
C
1118 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/seq_file.c
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*
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* helper functions for making synthetic files from sequences of records.
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* initial implementation -- AV, Oct 2001.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cache.h>
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#include <linux/fs.h>
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#include <linux/export.h>
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#include <linux/seq_file.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/cred.h>
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#include <linux/mm.h>
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#include <linux/printk.h>
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#include <linux/string_helpers.h>
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#include <linux/uio.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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static struct kmem_cache *seq_file_cache __ro_after_init;
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static void seq_set_overflow(struct seq_file *m)
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{
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m->count = m->size;
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}
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static void *seq_buf_alloc(unsigned long size)
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{
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if (unlikely(size > MAX_RW_COUNT))
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return NULL;
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return kvmalloc(size, GFP_KERNEL_ACCOUNT);
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}
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/**
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* seq_open - initialize sequential file
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* @file: file we initialize
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* @op: method table describing the sequence
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*
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* seq_open() sets @file, associating it with a sequence described
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* by @op. @op->start() sets the iterator up and returns the first
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* element of sequence. @op->stop() shuts it down. @op->next()
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* returns the next element of sequence. @op->show() prints element
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* into the buffer. In case of error ->start() and ->next() return
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* ERR_PTR(error). In the end of sequence they return %NULL. ->show()
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* returns 0 in case of success and negative number in case of error.
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* Returning SEQ_SKIP means "discard this element and move on".
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* Note: seq_open() will allocate a struct seq_file and store its
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* pointer in @file->private_data. This pointer should not be modified.
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*/
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int seq_open(struct file *file, const struct seq_operations *op)
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{
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struct seq_file *p;
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WARN_ON(file->private_data);
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p = kmem_cache_zalloc(seq_file_cache, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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file->private_data = p;
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mutex_init(&p->lock);
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p->op = op;
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// No refcounting: the lifetime of 'p' is constrained
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// to the lifetime of the file.
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p->file = file;
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/*
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* seq_files support lseek() and pread(). They do not implement
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* write() at all, but we clear FMODE_PWRITE here for historical
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* reasons.
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*
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* If a client of seq_files a) implements file.write() and b) wishes to
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* support pwrite() then that client will need to implement its own
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* file.open() which calls seq_open() and then sets FMODE_PWRITE.
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*/
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file->f_mode &= ~FMODE_PWRITE;
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return 0;
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}
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EXPORT_SYMBOL(seq_open);
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static int traverse(struct seq_file *m, loff_t offset)
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{
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loff_t pos = 0;
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int error = 0;
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void *p;
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m->index = 0;
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m->count = m->from = 0;
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if (!offset)
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return 0;
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if (!m->buf) {
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m->buf = seq_buf_alloc(m->size = PAGE_SIZE);
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if (!m->buf)
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return -ENOMEM;
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}
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p = m->op->start(m, &m->index);
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while (p) {
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error = PTR_ERR(p);
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if (IS_ERR(p))
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break;
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error = m->op->show(m, p);
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if (error < 0)
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break;
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if (unlikely(error)) {
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error = 0;
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m->count = 0;
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}
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if (seq_has_overflowed(m))
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goto Eoverflow;
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p = m->op->next(m, p, &m->index);
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if (pos + m->count > offset) {
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m->from = offset - pos;
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m->count -= m->from;
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break;
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}
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pos += m->count;
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m->count = 0;
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if (pos == offset)
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break;
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}
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m->op->stop(m, p);
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return error;
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Eoverflow:
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m->op->stop(m, p);
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kvfree(m->buf);
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m->count = 0;
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m->buf = seq_buf_alloc(m->size <<= 1);
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return !m->buf ? -ENOMEM : -EAGAIN;
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}
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/**
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* seq_read - ->read() method for sequential files.
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* @file: the file to read from
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* @buf: the buffer to read to
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* @size: the maximum number of bytes to read
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* @ppos: the current position in the file
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*
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* Ready-made ->f_op->read()
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*/
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ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
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{
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struct iovec iov = { .iov_base = buf, .iov_len = size};
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struct kiocb kiocb;
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struct iov_iter iter;
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ssize_t ret;
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init_sync_kiocb(&kiocb, file);
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iov_iter_init(&iter, READ, &iov, 1, size);
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kiocb.ki_pos = *ppos;
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ret = seq_read_iter(&kiocb, &iter);
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*ppos = kiocb.ki_pos;
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return ret;
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}
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EXPORT_SYMBOL(seq_read);
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/*
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* Ready-made ->f_op->read_iter()
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*/
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ssize_t seq_read_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct seq_file *m = iocb->ki_filp->private_data;
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size_t copied = 0;
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size_t n;
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void *p;
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int err = 0;
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if (!iov_iter_count(iter))
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return 0;
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mutex_lock(&m->lock);
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/*
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* if request is to read from zero offset, reset iterator to first
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* record as it might have been already advanced by previous requests
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*/
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if (iocb->ki_pos == 0) {
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m->index = 0;
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m->count = 0;
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}
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/* Don't assume ki_pos is where we left it */
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if (unlikely(iocb->ki_pos != m->read_pos)) {
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while ((err = traverse(m, iocb->ki_pos)) == -EAGAIN)
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;
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if (err) {
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/* With prejudice... */
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m->read_pos = 0;
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m->index = 0;
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m->count = 0;
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goto Done;
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} else {
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m->read_pos = iocb->ki_pos;
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}
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}
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/* grab buffer if we didn't have one */
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if (!m->buf) {
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m->buf = seq_buf_alloc(m->size = PAGE_SIZE);
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if (!m->buf)
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goto Enomem;
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}
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// something left in the buffer - copy it out first
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if (m->count) {
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n = copy_to_iter(m->buf + m->from, m->count, iter);
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m->count -= n;
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m->from += n;
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copied += n;
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if (m->count) // hadn't managed to copy everything
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goto Done;
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}
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// get a non-empty record in the buffer
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m->from = 0;
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p = m->op->start(m, &m->index);
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while (1) {
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err = PTR_ERR(p);
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if (!p || IS_ERR(p)) // EOF or an error
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break;
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err = m->op->show(m, p);
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if (err < 0) // hard error
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break;
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if (unlikely(err)) // ->show() says "skip it"
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m->count = 0;
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if (unlikely(!m->count)) { // empty record
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p = m->op->next(m, p, &m->index);
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continue;
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}
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if (!seq_has_overflowed(m)) // got it
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goto Fill;
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// need a bigger buffer
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m->op->stop(m, p);
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kvfree(m->buf);
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m->count = 0;
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m->buf = seq_buf_alloc(m->size <<= 1);
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if (!m->buf)
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goto Enomem;
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p = m->op->start(m, &m->index);
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}
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// EOF or an error
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m->op->stop(m, p);
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m->count = 0;
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goto Done;
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Fill:
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// one non-empty record is in the buffer; if they want more,
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// try to fit more in, but in any case we need to advance
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// the iterator once for every record shown.
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while (1) {
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size_t offs = m->count;
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loff_t pos = m->index;
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p = m->op->next(m, p, &m->index);
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if (pos == m->index) {
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pr_info_ratelimited("buggy .next function %ps did not update position index\n",
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m->op->next);
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m->index++;
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}
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if (!p || IS_ERR(p)) // no next record for us
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break;
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if (m->count >= iov_iter_count(iter))
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break;
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err = m->op->show(m, p);
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if (err > 0) { // ->show() says "skip it"
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m->count = offs;
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} else if (err || seq_has_overflowed(m)) {
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m->count = offs;
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break;
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}
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}
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m->op->stop(m, p);
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n = copy_to_iter(m->buf, m->count, iter);
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copied += n;
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m->count -= n;
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m->from = n;
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Done:
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if (unlikely(!copied)) {
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copied = m->count ? -EFAULT : err;
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} else {
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iocb->ki_pos += copied;
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m->read_pos += copied;
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}
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mutex_unlock(&m->lock);
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return copied;
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Enomem:
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err = -ENOMEM;
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goto Done;
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}
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EXPORT_SYMBOL(seq_read_iter);
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/**
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* seq_lseek - ->llseek() method for sequential files.
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* @file: the file in question
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* @offset: new position
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* @whence: 0 for absolute, 1 for relative position
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*
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* Ready-made ->f_op->llseek()
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*/
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loff_t seq_lseek(struct file *file, loff_t offset, int whence)
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{
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struct seq_file *m = file->private_data;
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loff_t retval = -EINVAL;
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mutex_lock(&m->lock);
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switch (whence) {
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case SEEK_CUR:
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offset += file->f_pos;
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fallthrough;
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case SEEK_SET:
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if (offset < 0)
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break;
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retval = offset;
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if (offset != m->read_pos) {
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while ((retval = traverse(m, offset)) == -EAGAIN)
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;
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if (retval) {
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/* with extreme prejudice... */
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file->f_pos = 0;
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m->read_pos = 0;
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m->index = 0;
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m->count = 0;
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} else {
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m->read_pos = offset;
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retval = file->f_pos = offset;
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}
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} else {
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file->f_pos = offset;
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}
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}
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mutex_unlock(&m->lock);
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return retval;
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}
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EXPORT_SYMBOL(seq_lseek);
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/**
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* seq_release - free the structures associated with sequential file.
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* @file: file in question
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* @inode: its inode
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*
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* Frees the structures associated with sequential file; can be used
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* as ->f_op->release() if you don't have private data to destroy.
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*/
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int seq_release(struct inode *inode, struct file *file)
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{
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struct seq_file *m = file->private_data;
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kvfree(m->buf);
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kmem_cache_free(seq_file_cache, m);
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return 0;
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}
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EXPORT_SYMBOL(seq_release);
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/**
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* seq_escape_mem - print data into buffer, escaping some characters
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* @m: target buffer
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* @src: source buffer
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* @len: size of source buffer
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* @flags: flags to pass to string_escape_mem()
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* @esc: set of characters that need escaping
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*
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* Puts data into buffer, replacing each occurrence of character from
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* given class (defined by @flags and @esc) with printable escaped sequence.
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*
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* Use seq_has_overflowed() to check for errors.
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*/
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void seq_escape_mem(struct seq_file *m, const char *src, size_t len,
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unsigned int flags, const char *esc)
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{
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char *buf;
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size_t size = seq_get_buf(m, &buf);
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int ret;
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ret = string_escape_mem(src, len, buf, size, flags, esc);
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seq_commit(m, ret < size ? ret : -1);
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}
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EXPORT_SYMBOL(seq_escape_mem);
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void seq_vprintf(struct seq_file *m, const char *f, va_list args)
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{
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int len;
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if (m->count < m->size) {
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len = vsnprintf(m->buf + m->count, m->size - m->count, f, args);
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if (m->count + len < m->size) {
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m->count += len;
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return;
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}
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}
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seq_set_overflow(m);
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}
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EXPORT_SYMBOL(seq_vprintf);
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void seq_printf(struct seq_file *m, const char *f, ...)
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{
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va_list args;
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va_start(args, f);
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seq_vprintf(m, f, args);
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va_end(args);
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}
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EXPORT_SYMBOL(seq_printf);
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#ifdef CONFIG_BINARY_PRINTF
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void seq_bprintf(struct seq_file *m, const char *f, const u32 *binary)
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{
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int len;
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if (m->count < m->size) {
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len = bstr_printf(m->buf + m->count, m->size - m->count, f,
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binary);
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if (m->count + len < m->size) {
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m->count += len;
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return;
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}
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}
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seq_set_overflow(m);
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}
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EXPORT_SYMBOL(seq_bprintf);
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#endif /* CONFIG_BINARY_PRINTF */
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/**
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* mangle_path - mangle and copy path to buffer beginning
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* @s: buffer start
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* @p: beginning of path in above buffer
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* @esc: set of characters that need escaping
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*
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* Copy the path from @p to @s, replacing each occurrence of character from
|
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* @esc with usual octal escape.
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* Returns pointer past last written character in @s, or NULL in case of
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* failure.
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*/
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char *mangle_path(char *s, const char *p, const char *esc)
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{
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while (s <= p) {
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char c = *p++;
|
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if (!c) {
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return s;
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} else if (!strchr(esc, c)) {
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*s++ = c;
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} else if (s + 4 > p) {
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break;
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} else {
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*s++ = '\\';
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*s++ = '0' + ((c & 0300) >> 6);
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*s++ = '0' + ((c & 070) >> 3);
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*s++ = '0' + (c & 07);
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL(mangle_path);
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|
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/**
|
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* seq_path - seq_file interface to print a pathname
|
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* @m: the seq_file handle
|
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* @path: the struct path to print
|
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* @esc: set of characters to escape in the output
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*
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* return the absolute path of 'path', as represented by the
|
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* dentry / mnt pair in the path parameter.
|
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*/
|
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int seq_path(struct seq_file *m, const struct path *path, const char *esc)
|
|
{
|
|
char *buf;
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size_t size = seq_get_buf(m, &buf);
|
|
int res = -1;
|
|
|
|
if (size) {
|
|
char *p = d_path(path, buf, size);
|
|
if (!IS_ERR(p)) {
|
|
char *end = mangle_path(buf, p, esc);
|
|
if (end)
|
|
res = end - buf;
|
|
}
|
|
}
|
|
seq_commit(m, res);
|
|
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(seq_path);
|
|
|
|
/**
|
|
* seq_file_path - seq_file interface to print a pathname of a file
|
|
* @m: the seq_file handle
|
|
* @file: the struct file to print
|
|
* @esc: set of characters to escape in the output
|
|
*
|
|
* return the absolute path to the file.
|
|
*/
|
|
int seq_file_path(struct seq_file *m, struct file *file, const char *esc)
|
|
{
|
|
return seq_path(m, &file->f_path, esc);
|
|
}
|
|
EXPORT_SYMBOL(seq_file_path);
|
|
|
|
/*
|
|
* Same as seq_path, but relative to supplied root.
|
|
*/
|
|
int seq_path_root(struct seq_file *m, const struct path *path,
|
|
const struct path *root, const char *esc)
|
|
{
|
|
char *buf;
|
|
size_t size = seq_get_buf(m, &buf);
|
|
int res = -ENAMETOOLONG;
|
|
|
|
if (size) {
|
|
char *p;
|
|
|
|
p = __d_path(path, root, buf, size);
|
|
if (!p)
|
|
return SEQ_SKIP;
|
|
res = PTR_ERR(p);
|
|
if (!IS_ERR(p)) {
|
|
char *end = mangle_path(buf, p, esc);
|
|
if (end)
|
|
res = end - buf;
|
|
else
|
|
res = -ENAMETOOLONG;
|
|
}
|
|
}
|
|
seq_commit(m, res);
|
|
|
|
return res < 0 && res != -ENAMETOOLONG ? res : 0;
|
|
}
|
|
|
|
/*
|
|
* returns the path of the 'dentry' from the root of its filesystem.
|
|
*/
|
|
int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc)
|
|
{
|
|
char *buf;
|
|
size_t size = seq_get_buf(m, &buf);
|
|
int res = -1;
|
|
|
|
if (size) {
|
|
char *p = dentry_path(dentry, buf, size);
|
|
if (!IS_ERR(p)) {
|
|
char *end = mangle_path(buf, p, esc);
|
|
if (end)
|
|
res = end - buf;
|
|
}
|
|
}
|
|
seq_commit(m, res);
|
|
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(seq_dentry);
|
|
|
|
static void *single_start(struct seq_file *p, loff_t *pos)
|
|
{
|
|
return NULL + (*pos == 0);
|
|
}
|
|
|
|
static void *single_next(struct seq_file *p, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return NULL;
|
|
}
|
|
|
|
static void single_stop(struct seq_file *p, void *v)
|
|
{
|
|
}
|
|
|
|
int single_open(struct file *file, int (*show)(struct seq_file *, void *),
|
|
void *data)
|
|
{
|
|
struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT);
|
|
int res = -ENOMEM;
|
|
|
|
if (op) {
|
|
op->start = single_start;
|
|
op->next = single_next;
|
|
op->stop = single_stop;
|
|
op->show = show;
|
|
res = seq_open(file, op);
|
|
if (!res)
|
|
((struct seq_file *)file->private_data)->private = data;
|
|
else
|
|
kfree(op);
|
|
}
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(single_open);
|
|
|
|
int single_open_size(struct file *file, int (*show)(struct seq_file *, void *),
|
|
void *data, size_t size)
|
|
{
|
|
char *buf = seq_buf_alloc(size);
|
|
int ret;
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
ret = single_open(file, show, data);
|
|
if (ret) {
|
|
kvfree(buf);
|
|
return ret;
|
|
}
|
|
((struct seq_file *)file->private_data)->buf = buf;
|
|
((struct seq_file *)file->private_data)->size = size;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(single_open_size);
|
|
|
|
int single_release(struct inode *inode, struct file *file)
|
|
{
|
|
const struct seq_operations *op = ((struct seq_file *)file->private_data)->op;
|
|
int res = seq_release(inode, file);
|
|
kfree(op);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(single_release);
|
|
|
|
int seq_release_private(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
|
|
kfree(seq->private);
|
|
seq->private = NULL;
|
|
return seq_release(inode, file);
|
|
}
|
|
EXPORT_SYMBOL(seq_release_private);
|
|
|
|
void *__seq_open_private(struct file *f, const struct seq_operations *ops,
|
|
int psize)
|
|
{
|
|
int rc;
|
|
void *private;
|
|
struct seq_file *seq;
|
|
|
|
private = kzalloc(psize, GFP_KERNEL_ACCOUNT);
|
|
if (private == NULL)
|
|
goto out;
|
|
|
|
rc = seq_open(f, ops);
|
|
if (rc < 0)
|
|
goto out_free;
|
|
|
|
seq = f->private_data;
|
|
seq->private = private;
|
|
return private;
|
|
|
|
out_free:
|
|
kfree(private);
|
|
out:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__seq_open_private);
|
|
|
|
int seq_open_private(struct file *filp, const struct seq_operations *ops,
|
|
int psize)
|
|
{
|
|
return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL(seq_open_private);
|
|
|
|
void seq_putc(struct seq_file *m, char c)
|
|
{
|
|
if (m->count >= m->size)
|
|
return;
|
|
|
|
m->buf[m->count++] = c;
|
|
}
|
|
EXPORT_SYMBOL(seq_putc);
|
|
|
|
void seq_puts(struct seq_file *m, const char *s)
|
|
{
|
|
int len = strlen(s);
|
|
|
|
if (m->count + len >= m->size) {
|
|
seq_set_overflow(m);
|
|
return;
|
|
}
|
|
memcpy(m->buf + m->count, s, len);
|
|
m->count += len;
|
|
}
|
|
EXPORT_SYMBOL(seq_puts);
|
|
|
|
/**
|
|
* seq_put_decimal_ull_width - A helper routine for putting decimal numbers
|
|
* without rich format of printf().
|
|
* only 'unsigned long long' is supported.
|
|
* @m: seq_file identifying the buffer to which data should be written
|
|
* @delimiter: a string which is printed before the number
|
|
* @num: the number
|
|
* @width: a minimum field width
|
|
*
|
|
* This routine will put strlen(delimiter) + number into seq_filed.
|
|
* This routine is very quick when you show lots of numbers.
|
|
* In usual cases, it will be better to use seq_printf(). It's easier to read.
|
|
*/
|
|
void seq_put_decimal_ull_width(struct seq_file *m, const char *delimiter,
|
|
unsigned long long num, unsigned int width)
|
|
{
|
|
int len;
|
|
|
|
if (m->count + 2 >= m->size) /* we'll write 2 bytes at least */
|
|
goto overflow;
|
|
|
|
if (delimiter && delimiter[0]) {
|
|
if (delimiter[1] == 0)
|
|
seq_putc(m, delimiter[0]);
|
|
else
|
|
seq_puts(m, delimiter);
|
|
}
|
|
|
|
if (!width)
|
|
width = 1;
|
|
|
|
if (m->count + width >= m->size)
|
|
goto overflow;
|
|
|
|
len = num_to_str(m->buf + m->count, m->size - m->count, num, width);
|
|
if (!len)
|
|
goto overflow;
|
|
|
|
m->count += len;
|
|
return;
|
|
|
|
overflow:
|
|
seq_set_overflow(m);
|
|
}
|
|
|
|
void seq_put_decimal_ull(struct seq_file *m, const char *delimiter,
|
|
unsigned long long num)
|
|
{
|
|
return seq_put_decimal_ull_width(m, delimiter, num, 0);
|
|
}
|
|
EXPORT_SYMBOL(seq_put_decimal_ull);
|
|
|
|
/**
|
|
* seq_put_hex_ll - put a number in hexadecimal notation
|
|
* @m: seq_file identifying the buffer to which data should be written
|
|
* @delimiter: a string which is printed before the number
|
|
* @v: the number
|
|
* @width: a minimum field width
|
|
*
|
|
* seq_put_hex_ll(m, "", v, 8) is equal to seq_printf(m, "%08llx", v)
|
|
*
|
|
* This routine is very quick when you show lots of numbers.
|
|
* In usual cases, it will be better to use seq_printf(). It's easier to read.
|
|
*/
|
|
void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
|
|
unsigned long long v, unsigned int width)
|
|
{
|
|
unsigned int len;
|
|
int i;
|
|
|
|
if (delimiter && delimiter[0]) {
|
|
if (delimiter[1] == 0)
|
|
seq_putc(m, delimiter[0]);
|
|
else
|
|
seq_puts(m, delimiter);
|
|
}
|
|
|
|
/* If x is 0, the result of __builtin_clzll is undefined */
|
|
if (v == 0)
|
|
len = 1;
|
|
else
|
|
len = (sizeof(v) * 8 - __builtin_clzll(v) + 3) / 4;
|
|
|
|
if (len < width)
|
|
len = width;
|
|
|
|
if (m->count + len > m->size) {
|
|
seq_set_overflow(m);
|
|
return;
|
|
}
|
|
|
|
for (i = len - 1; i >= 0; i--) {
|
|
m->buf[m->count + i] = hex_asc[0xf & v];
|
|
v = v >> 4;
|
|
}
|
|
m->count += len;
|
|
}
|
|
|
|
void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num)
|
|
{
|
|
int len;
|
|
|
|
if (m->count + 3 >= m->size) /* we'll write 2 bytes at least */
|
|
goto overflow;
|
|
|
|
if (delimiter && delimiter[0]) {
|
|
if (delimiter[1] == 0)
|
|
seq_putc(m, delimiter[0]);
|
|
else
|
|
seq_puts(m, delimiter);
|
|
}
|
|
|
|
if (m->count + 2 >= m->size)
|
|
goto overflow;
|
|
|
|
if (num < 0) {
|
|
m->buf[m->count++] = '-';
|
|
num = -num;
|
|
}
|
|
|
|
if (num < 10) {
|
|
m->buf[m->count++] = num + '0';
|
|
return;
|
|
}
|
|
|
|
len = num_to_str(m->buf + m->count, m->size - m->count, num, 0);
|
|
if (!len)
|
|
goto overflow;
|
|
|
|
m->count += len;
|
|
return;
|
|
|
|
overflow:
|
|
seq_set_overflow(m);
|
|
}
|
|
EXPORT_SYMBOL(seq_put_decimal_ll);
|
|
|
|
/**
|
|
* seq_write - write arbitrary data to buffer
|
|
* @seq: seq_file identifying the buffer to which data should be written
|
|
* @data: data address
|
|
* @len: number of bytes
|
|
*
|
|
* Return 0 on success, non-zero otherwise.
|
|
*/
|
|
int seq_write(struct seq_file *seq, const void *data, size_t len)
|
|
{
|
|
if (seq->count + len < seq->size) {
|
|
memcpy(seq->buf + seq->count, data, len);
|
|
seq->count += len;
|
|
return 0;
|
|
}
|
|
seq_set_overflow(seq);
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(seq_write);
|
|
|
|
/**
|
|
* seq_pad - write padding spaces to buffer
|
|
* @m: seq_file identifying the buffer to which data should be written
|
|
* @c: the byte to append after padding if non-zero
|
|
*/
|
|
void seq_pad(struct seq_file *m, char c)
|
|
{
|
|
int size = m->pad_until - m->count;
|
|
if (size > 0) {
|
|
if (size + m->count > m->size) {
|
|
seq_set_overflow(m);
|
|
return;
|
|
}
|
|
memset(m->buf + m->count, ' ', size);
|
|
m->count += size;
|
|
}
|
|
if (c)
|
|
seq_putc(m, c);
|
|
}
|
|
EXPORT_SYMBOL(seq_pad);
|
|
|
|
/* A complete analogue of print_hex_dump() */
|
|
void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
|
|
int rowsize, int groupsize, const void *buf, size_t len,
|
|
bool ascii)
|
|
{
|
|
const u8 *ptr = buf;
|
|
int i, linelen, remaining = len;
|
|
char *buffer;
|
|
size_t size;
|
|
int ret;
|
|
|
|
if (rowsize != 16 && rowsize != 32)
|
|
rowsize = 16;
|
|
|
|
for (i = 0; i < len && !seq_has_overflowed(m); i += rowsize) {
|
|
linelen = min(remaining, rowsize);
|
|
remaining -= rowsize;
|
|
|
|
switch (prefix_type) {
|
|
case DUMP_PREFIX_ADDRESS:
|
|
seq_printf(m, "%s%p: ", prefix_str, ptr + i);
|
|
break;
|
|
case DUMP_PREFIX_OFFSET:
|
|
seq_printf(m, "%s%.8x: ", prefix_str, i);
|
|
break;
|
|
default:
|
|
seq_printf(m, "%s", prefix_str);
|
|
break;
|
|
}
|
|
|
|
size = seq_get_buf(m, &buffer);
|
|
ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
|
|
buffer, size, ascii);
|
|
seq_commit(m, ret < size ? ret : -1);
|
|
|
|
seq_putc(m, '\n');
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(seq_hex_dump);
|
|
|
|
struct list_head *seq_list_start(struct list_head *head, loff_t pos)
|
|
{
|
|
struct list_head *lh;
|
|
|
|
list_for_each(lh, head)
|
|
if (pos-- == 0)
|
|
return lh;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(seq_list_start);
|
|
|
|
struct list_head *seq_list_start_head(struct list_head *head, loff_t pos)
|
|
{
|
|
if (!pos)
|
|
return head;
|
|
|
|
return seq_list_start(head, pos - 1);
|
|
}
|
|
EXPORT_SYMBOL(seq_list_start_head);
|
|
|
|
struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos)
|
|
{
|
|
struct list_head *lh;
|
|
|
|
lh = ((struct list_head *)v)->next;
|
|
++*ppos;
|
|
return lh == head ? NULL : lh;
|
|
}
|
|
EXPORT_SYMBOL(seq_list_next);
|
|
|
|
/**
|
|
* seq_hlist_start - start an iteration of a hlist
|
|
* @head: the head of the hlist
|
|
* @pos: the start position of the sequence
|
|
*
|
|
* Called at seq_file->op->start().
|
|
*/
|
|
struct hlist_node *seq_hlist_start(struct hlist_head *head, loff_t pos)
|
|
{
|
|
struct hlist_node *node;
|
|
|
|
hlist_for_each(node, head)
|
|
if (pos-- == 0)
|
|
return node;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_start);
|
|
|
|
/**
|
|
* seq_hlist_start_head - start an iteration of a hlist
|
|
* @head: the head of the hlist
|
|
* @pos: the start position of the sequence
|
|
*
|
|
* Called at seq_file->op->start(). Call this function if you want to
|
|
* print a header at the top of the output.
|
|
*/
|
|
struct hlist_node *seq_hlist_start_head(struct hlist_head *head, loff_t pos)
|
|
{
|
|
if (!pos)
|
|
return SEQ_START_TOKEN;
|
|
|
|
return seq_hlist_start(head, pos - 1);
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_start_head);
|
|
|
|
/**
|
|
* seq_hlist_next - move to the next position of the hlist
|
|
* @v: the current iterator
|
|
* @head: the head of the hlist
|
|
* @ppos: the current position
|
|
*
|
|
* Called at seq_file->op->next().
|
|
*/
|
|
struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
|
|
loff_t *ppos)
|
|
{
|
|
struct hlist_node *node = v;
|
|
|
|
++*ppos;
|
|
if (v == SEQ_START_TOKEN)
|
|
return head->first;
|
|
else
|
|
return node->next;
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_next);
|
|
|
|
/**
|
|
* seq_hlist_start_rcu - start an iteration of a hlist protected by RCU
|
|
* @head: the head of the hlist
|
|
* @pos: the start position of the sequence
|
|
*
|
|
* Called at seq_file->op->start().
|
|
*
|
|
* This list-traversal primitive may safely run concurrently with
|
|
* the _rcu list-mutation primitives such as hlist_add_head_rcu()
|
|
* as long as the traversal is guarded by rcu_read_lock().
|
|
*/
|
|
struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
|
|
loff_t pos)
|
|
{
|
|
struct hlist_node *node;
|
|
|
|
__hlist_for_each_rcu(node, head)
|
|
if (pos-- == 0)
|
|
return node;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_start_rcu);
|
|
|
|
/**
|
|
* seq_hlist_start_head_rcu - start an iteration of a hlist protected by RCU
|
|
* @head: the head of the hlist
|
|
* @pos: the start position of the sequence
|
|
*
|
|
* Called at seq_file->op->start(). Call this function if you want to
|
|
* print a header at the top of the output.
|
|
*
|
|
* This list-traversal primitive may safely run concurrently with
|
|
* the _rcu list-mutation primitives such as hlist_add_head_rcu()
|
|
* as long as the traversal is guarded by rcu_read_lock().
|
|
*/
|
|
struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
|
|
loff_t pos)
|
|
{
|
|
if (!pos)
|
|
return SEQ_START_TOKEN;
|
|
|
|
return seq_hlist_start_rcu(head, pos - 1);
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_start_head_rcu);
|
|
|
|
/**
|
|
* seq_hlist_next_rcu - move to the next position of the hlist protected by RCU
|
|
* @v: the current iterator
|
|
* @head: the head of the hlist
|
|
* @ppos: the current position
|
|
*
|
|
* Called at seq_file->op->next().
|
|
*
|
|
* This list-traversal primitive may safely run concurrently with
|
|
* the _rcu list-mutation primitives such as hlist_add_head_rcu()
|
|
* as long as the traversal is guarded by rcu_read_lock().
|
|
*/
|
|
struct hlist_node *seq_hlist_next_rcu(void *v,
|
|
struct hlist_head *head,
|
|
loff_t *ppos)
|
|
{
|
|
struct hlist_node *node = v;
|
|
|
|
++*ppos;
|
|
if (v == SEQ_START_TOKEN)
|
|
return rcu_dereference(head->first);
|
|
else
|
|
return rcu_dereference(node->next);
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_next_rcu);
|
|
|
|
/**
|
|
* seq_hlist_start_percpu - start an iteration of a percpu hlist array
|
|
* @head: pointer to percpu array of struct hlist_heads
|
|
* @cpu: pointer to cpu "cursor"
|
|
* @pos: start position of sequence
|
|
*
|
|
* Called at seq_file->op->start().
|
|
*/
|
|
struct hlist_node *
|
|
seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos)
|
|
{
|
|
struct hlist_node *node;
|
|
|
|
for_each_possible_cpu(*cpu) {
|
|
hlist_for_each(node, per_cpu_ptr(head, *cpu)) {
|
|
if (pos-- == 0)
|
|
return node;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_start_percpu);
|
|
|
|
/**
|
|
* seq_hlist_next_percpu - move to the next position of the percpu hlist array
|
|
* @v: pointer to current hlist_node
|
|
* @head: pointer to percpu array of struct hlist_heads
|
|
* @cpu: pointer to cpu "cursor"
|
|
* @pos: start position of sequence
|
|
*
|
|
* Called at seq_file->op->next().
|
|
*/
|
|
struct hlist_node *
|
|
seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head,
|
|
int *cpu, loff_t *pos)
|
|
{
|
|
struct hlist_node *node = v;
|
|
|
|
++*pos;
|
|
|
|
if (node->next)
|
|
return node->next;
|
|
|
|
for (*cpu = cpumask_next(*cpu, cpu_possible_mask); *cpu < nr_cpu_ids;
|
|
*cpu = cpumask_next(*cpu, cpu_possible_mask)) {
|
|
struct hlist_head *bucket = per_cpu_ptr(head, *cpu);
|
|
|
|
if (!hlist_empty(bucket))
|
|
return bucket->first;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(seq_hlist_next_percpu);
|
|
|
|
void __init seq_file_init(void)
|
|
{
|
|
seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC);
|
|
}
|