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fs/seq_file.c
22.8 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/fs/seq_file.c * * helper functions for making synthetic files from sequences of records. * initial implementation -- AV, Oct 2001. */ #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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|
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#include <linux/uaccess.h> |
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#include <asm/page.h> |
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static void seq_set_overflow(struct seq_file *m) { m->count = m->size; } |
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static void *seq_buf_alloc(unsigned long size) { |
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return kvmalloc(size, GFP_KERNEL); |
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} |
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/** * seq_open - initialize sequential file * @file: file we initialize * @op: method table describing the sequence * * seq_open() sets @file, associating it with a sequence described * by @op. @op->start() sets the iterator up and returns the first * element of sequence. @op->stop() shuts it down. @op->next() * returns the next element of sequence. @op->show() prints element * into the buffer. In case of error ->start() and ->next() return * ERR_PTR(error). In the end of sequence they return %NULL. ->show() * 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 * 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; WARN_ON(file->private_data); p = kzalloc(sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; file->private_data = p; |
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|
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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 // to the lifetime of the file. p->file = file; |
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/* * Wrappers around seq_open(e.g. swaps_open) need to be * aware of this. If they set f_version themselves, they * should call seq_open first and then set f_version. */ file->f_version = 0; |
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/* * seq_files support lseek() and pread(). They do not implement * write() at all, but we clear FMODE_PWRITE here for historical * reasons. * * If a client of seq_files a) implements file.write() and b) wishes to * support pwrite() then that client will need to implement its own * file.open() which calls seq_open() and then sets FMODE_PWRITE. */ file->f_mode &= ~FMODE_PWRITE; |
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return 0; } EXPORT_SYMBOL(seq_open); |
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static int traverse(struct seq_file *m, loff_t offset) { loff_t pos = 0, index; int error = 0; void *p; m->version = 0; index = 0; m->count = m->from = 0; if (!offset) { m->index = index; return 0; } if (!m->buf) { |
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m->buf = seq_buf_alloc(m->size = PAGE_SIZE); |
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if (!m->buf) return -ENOMEM; } p = m->op->start(m, &index); while (p) { error = PTR_ERR(p); if (IS_ERR(p)) break; error = m->op->show(m, p); if (error < 0) break; if (unlikely(error)) { error = 0; m->count = 0; } |
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if (seq_has_overflowed(m)) |
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goto Eoverflow; if (pos + m->count > offset) { m->from = offset - pos; m->count -= m->from; m->index = index; break; } pos += m->count; m->count = 0; if (pos == offset) { index++; m->index = index; break; } p = m->op->next(m, p, &index); } m->op->stop(m, p); |
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m->index = index; |
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return error; Eoverflow: 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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/** * seq_read - ->read() method for sequential files. |
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* @file: the file to read from * @buf: the buffer to read to * @size: the maximum number of bytes to read * @ppos: the current position in the file |
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* * Ready-made ->f_op->read() */ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) { |
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struct seq_file *m = file->private_data; |
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size_t copied = 0; loff_t pos; size_t n; void *p; int err = 0; |
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mutex_lock(&m->lock); |
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|
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/* * seq_file->op->..m_start/m_stop/m_next may do special actions * or optimisations based on the file->f_version, so we want to * pass the file->f_version to those methods. * * seq_file->version is just copy of f_version, and seq_file * methods can treat it simply as file version. * It is copied in first and copied out after all operations. * It is convenient to have it as part of structure to avoid the * need of passing another argument to all the seq_file methods. */ m->version = file->f_version; |
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/* * if request is to read from zero offset, reset iterator to first * record as it might have been already advanced by previous requests */ |
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if (*ppos == 0) { |
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m->index = 0; |
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m->version = 0; m->count = 0; } |
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|
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/* Don't assume *ppos is where we left it */ if (unlikely(*ppos != m->read_pos)) { |
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while ((err = traverse(m, *ppos)) == -EAGAIN) ; if (err) { /* With prejudice... */ m->read_pos = 0; m->version = 0; m->index = 0; m->count = 0; goto Done; |
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} else { m->read_pos = *ppos; |
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} } |
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/* grab buffer if we didn't have one */ if (!m->buf) { |
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m->buf = seq_buf_alloc(m->size = PAGE_SIZE); |
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if (!m->buf) goto Enomem; } /* if not empty - flush it first */ if (m->count) { n = min(m->count, size); err = copy_to_user(buf, m->buf + m->from, n); if (err) goto Efault; m->count -= n; m->from += n; size -= n; buf += n; copied += n; |
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if (!m->count) { m->from = 0; |
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m->index++; |
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} |
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if (!size) goto Done; } /* we need at least one record in buffer */ |
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pos = m->index; p = m->op->start(m, &pos); |
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while (1) { |
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err = PTR_ERR(p); if (!p || IS_ERR(p)) break; err = m->op->show(m, p); |
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if (err < 0) |
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break; |
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if (unlikely(err)) m->count = 0; |
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if (unlikely(!m->count)) { p = m->op->next(m, p, &pos); m->index = pos; continue; } |
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if (m->count < m->size) goto Fill; 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) goto Enomem; |
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m->version = 0; |
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pos = m->index; p = m->op->start(m, &pos); |
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} m->op->stop(m, p); m->count = 0; goto Done; Fill: /* they want more? let's try to get some more */ while (m->count < size) { size_t offs = m->count; loff_t next = pos; p = m->op->next(m, p, &next); if (!p || IS_ERR(p)) { err = PTR_ERR(p); break; } err = m->op->show(m, p); |
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if (seq_has_overflowed(m) || err) { |
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m->count = offs; |
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if (likely(err <= 0)) break; |
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} pos = next; } m->op->stop(m, p); n = min(m->count, size); err = copy_to_user(buf, m->buf, n); if (err) goto Efault; copied += n; m->count -= n; if (m->count) m->from = n; else pos++; m->index = pos; Done: if (!copied) copied = err; |
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else { |
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*ppos += copied; |
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m->read_pos += copied; } |
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file->f_version = m->version; |
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mutex_unlock(&m->lock); |
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return copied; Enomem: err = -ENOMEM; goto Done; Efault: err = -EFAULT; goto Done; } EXPORT_SYMBOL(seq_read); |
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/** * seq_lseek - ->llseek() method for sequential files. |
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* @file: the file in question * @offset: new position |
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* @whence: 0 for absolute, 1 for relative position |
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* * Ready-made ->f_op->llseek() */ |
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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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|
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mutex_lock(&m->lock); |
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m->version = file->f_version; |
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switch (whence) { |
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case SEEK_CUR: offset += file->f_pos; case SEEK_SET: if (offset < 0) break; retval = offset; if (offset != m->read_pos) { while ((retval = traverse(m, offset)) == -EAGAIN) ; if (retval) { /* with extreme prejudice... */ file->f_pos = 0; m->read_pos = 0; m->version = 0; m->index = 0; m->count = 0; } else { m->read_pos = offset; retval = file->f_pos = offset; |
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} |
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} else { file->f_pos = offset; |
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} |
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} |
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file->f_version = m->version; |
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mutex_unlock(&m->lock); |
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return retval; } EXPORT_SYMBOL(seq_lseek); /** * seq_release - free the structures associated with sequential file. * @file: file in question |
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* @inode: its inode |
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* * Frees the structures associated with sequential file; can be used * as ->f_op->release() if you don't have private data to destroy. */ int seq_release(struct inode *inode, struct file *file) { |
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struct seq_file *m = file->private_data; |
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kvfree(m->buf); |
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kfree(m); return 0; } EXPORT_SYMBOL(seq_release); /** * seq_escape - print string into buffer, escaping some characters * @m: target buffer * @s: string * @esc: set of characters that need escaping * * Puts string into buffer, replacing each occurrence of character from |
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* @esc with usual octal escape. * Use seq_has_overflowed() to check for errors. |
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*/ |
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void seq_escape(struct seq_file *m, const char *s, const char *esc) |
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{ |
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char *buf; size_t size = seq_get_buf(m, &buf); int ret; |
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|
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ret = string_escape_str(s, buf, size, ESCAPE_OCTAL, esc); seq_commit(m, ret < size ? ret : -1); |
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} EXPORT_SYMBOL(seq_escape); |
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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; 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) { m->count += len; |
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return; |
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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; 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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/** |
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* mangle_path - mangle and copy path to buffer beginning * @s: buffer start * @p: beginning of path in above buffer * @esc: set of characters that need escaping |
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* * Copy the path from @p to @s, replacing each occurrence of character from * @esc with usual octal escape. * Returns pointer past last written character in @s, or NULL in case of * failure. */ |
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char *mangle_path(char *s, const char *p, const char *esc) |
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{ while (s <= p) { char c = *p++; if (!c) { return s; } else if (!strchr(esc, c)) { *s++ = c; } else if (s + 4 > p) { break; } else { *s++ = '\\'; *s++ = '0' + ((c & 0300) >> 6); *s++ = '0' + ((c & 070) >> 3); *s++ = '0' + (c & 07); } } return NULL; } |
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EXPORT_SYMBOL(mangle_path); |
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|
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/** * seq_path - seq_file interface to print a pathname * @m: the seq_file handle * @path: the struct path to print * @esc: set of characters to escape in the output * * return the absolute path of 'path', as represented by the * 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) |
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{ |
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char *buf; size_t size = seq_get_buf(m, &buf); int res = -1; if (size) { char *p = d_path(path, buf, size); |
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if (!IS_ERR(p)) { |
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char *end = mangle_path(buf, p, esc); if (end) res = end - buf; |
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} } |
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seq_commit(m, res); return res; |
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} EXPORT_SYMBOL(seq_path); |
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/** * 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); |
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/* |
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* Same as seq_path, but relative to supplied root. |
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*/ |
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int seq_path_root(struct seq_file *m, const struct path *path, const struct path *root, const char *esc) |
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{ |
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char *buf; size_t size = seq_get_buf(m, &buf); int res = -ENAMETOOLONG; if (size) { |
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char *p; |
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p = __d_path(path, root, buf, size); |
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if (!p) return SEQ_SKIP; |
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res = PTR_ERR(p); |
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if (!IS_ERR(p)) { |
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char *end = mangle_path(buf, p, esc); if (end) res = end - buf; else res = -ENAMETOOLONG; |
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} } |
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seq_commit(m, res); |
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return res < 0 && res != -ENAMETOOLONG ? res : 0; |
9d1bc6013 [patch 2/7] vfs: ... |
506 507 508 |
} /* |
6092d0481 [patch 1/7] vfs: ... |
509 510 |
* returns the path of the 'dentry' from the root of its filesystem. */ |
8c9379e97 constify seq_file... |
511 |
int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc) |
6092d0481 [patch 1/7] vfs: ... |
512 |
{ |
f84398068 vfs: seq_file: ad... |
513 514 515 516 517 518 |
char *buf; size_t size = seq_get_buf(m, &buf); int res = -1; if (size) { char *p = dentry_path(dentry, buf, size); |
6092d0481 [patch 1/7] vfs: ... |
519 |
if (!IS_ERR(p)) { |
f84398068 vfs: seq_file: ad... |
520 521 522 |
char *end = mangle_path(buf, p, esc); if (end) res = end - buf; |
6092d0481 [patch 1/7] vfs: ... |
523 524 |
} } |
f84398068 vfs: seq_file: ad... |
525 526 527 |
seq_commit(m, res); return res; |
6092d0481 [patch 1/7] vfs: ... |
528 |
} |
c8d3fe028 Btrfs: show subvo... |
529 |
EXPORT_SYMBOL(seq_dentry); |
6092d0481 [patch 1/7] vfs: ... |
530 |
|
1da177e4c Linux-2.6.12-rc2 |
531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 |
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); 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); |
2043f495c new helper: singl... |
566 567 568 |
int single_open_size(struct file *file, int (*show)(struct seq_file *, void *), void *data, size_t size) { |
058504edd fs/seq_file: fall... |
569 |
char *buf = seq_buf_alloc(size); |
2043f495c new helper: singl... |
570 571 572 573 574 |
int ret; if (!buf) return -ENOMEM; ret = single_open(file, show, data); if (ret) { |
058504edd fs/seq_file: fall... |
575 |
kvfree(buf); |
2043f495c new helper: singl... |
576 577 578 579 580 581 582 |
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); |
1da177e4c Linux-2.6.12-rc2 |
583 584 |
int single_release(struct inode *inode, struct file *file) { |
15ad7cdcf [PATCH] struct se... |
585 |
const struct seq_operations *op = ((struct seq_file *)file->private_data)->op; |
1da177e4c Linux-2.6.12-rc2 |
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 |
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); |
39699037a [FS] seq_file: In... |
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 |
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); 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); |
6798a8caa fs/seq_file: conv... |
633 |
void seq_putc(struct seq_file *m, char c) |
1da177e4c Linux-2.6.12-rc2 |
634 |
{ |
6798a8caa fs/seq_file: conv... |
635 636 637 638 |
if (m->count >= m->size) return; m->buf[m->count++] = c; |
1da177e4c Linux-2.6.12-rc2 |
639 640 |
} EXPORT_SYMBOL(seq_putc); |
6798a8caa fs/seq_file: conv... |
641 |
void seq_puts(struct seq_file *m, const char *s) |
1da177e4c Linux-2.6.12-rc2 |
642 643 |
{ int len = strlen(s); |
6798a8caa fs/seq_file: conv... |
644 645 646 647 |
if (m->count + len >= m->size) { seq_set_overflow(m); return; |
1da177e4c Linux-2.6.12-rc2 |
648 |
} |
6798a8caa fs/seq_file: conv... |
649 650 |
memcpy(m->buf + m->count, s, len); m->count += len; |
1da177e4c Linux-2.6.12-rc2 |
651 652 |
} EXPORT_SYMBOL(seq_puts); |
bcf67e162 Make common helpe... |
653 |
|
1ac101a5d procfs: add num_t... |
654 655 656 |
/* * A helper routine for putting decimal numbers without rich format of printf(). * only 'unsigned long long' is supported. |
75ba1d07f seq/proc: modify ... |
657 |
* This routine will put strlen(delimiter) + number into seq_file. |
1ac101a5d procfs: add num_t... |
658 659 660 |
* 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. */ |
75ba1d07f seq/proc: modify ... |
661 |
void seq_put_decimal_ull(struct seq_file *m, const char *delimiter, |
6798a8caa fs/seq_file: conv... |
662 |
unsigned long long num) |
1ac101a5d procfs: add num_t... |
663 664 665 666 667 |
{ int len; if (m->count + 2 >= m->size) /* we'll write 2 bytes at least */ goto overflow; |
75ba1d07f seq/proc: modify ... |
668 669 670 671 672 673 674 675 676 |
len = strlen(delimiter); if (m->count + len >= m->size) goto overflow; memcpy(m->buf + m->count, delimiter, len); m->count += len; if (m->count + 1 >= m->size) goto overflow; |
1ac101a5d procfs: add num_t... |
677 678 679 |
if (num < 10) { m->buf[m->count++] = num + '0'; |
6798a8caa fs/seq_file: conv... |
680 |
return; |
1ac101a5d procfs: add num_t... |
681 682 683 684 685 |
} len = num_to_str(m->buf + m->count, m->size - m->count, num); if (!len) goto overflow; |
75ba1d07f seq/proc: modify ... |
686 |
|
1ac101a5d procfs: add num_t... |
687 |
m->count += len; |
6798a8caa fs/seq_file: conv... |
688 |
return; |
1ac101a5d procfs: add num_t... |
689 |
overflow: |
e075f5915 seq_file: add seq... |
690 |
seq_set_overflow(m); |
1ac101a5d procfs: add num_t... |
691 692 |
} EXPORT_SYMBOL(seq_put_decimal_ull); |
75ba1d07f seq/proc: modify ... |
693 |
void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num) |
bda7bad62 procfs: speed up ... |
694 |
{ |
75ba1d07f seq/proc: modify ... |
695 696 697 698 699 700 701 702 703 704 705 706 707 708 |
int len; if (m->count + 3 >= m->size) /* we'll write 2 bytes at least */ goto overflow; len = strlen(delimiter); if (m->count + len >= m->size) goto overflow; memcpy(m->buf + m->count, delimiter, len); m->count += len; if (m->count + 2 >= m->size) goto overflow; |
bda7bad62 procfs: speed up ... |
709 |
if (num < 0) { |
75ba1d07f seq/proc: modify ... |
710 |
m->buf[m->count++] = '-'; |
bda7bad62 procfs: speed up ... |
711 |
num = -num; |
bda7bad62 procfs: speed up ... |
712 |
} |
75ba1d07f seq/proc: modify ... |
713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 |
if (num < 10) { m->buf[m->count++] = num + '0'; return; } len = num_to_str(m->buf + m->count, m->size - m->count, num); if (!len) goto overflow; m->count += len; return; overflow: seq_set_overflow(m); |
bda7bad62 procfs: speed up ... |
728 729 |
} EXPORT_SYMBOL(seq_put_decimal_ll); |
0b923606e seq_file: add fun... |
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 |
/** * 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; } |
e075f5915 seq_file: add seq... |
745 |
seq_set_overflow(seq); |
0b923606e seq_file: add fun... |
746 747 748 |
return -1; } EXPORT_SYMBOL(seq_write); |
839cc2a94 seq_file: introdu... |
749 750 751 752 753 754 755 756 757 758 759 760 761 762 |
/** * 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) seq_printf(m, "%*s", size, ""); if (c) seq_putc(m, c); } EXPORT_SYMBOL(seq_pad); |
37607102c seq_file: provide... |
763 764 765 766 767 768 769 |
/* 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; |
8b91a318e fs/seq_file: use ... |
770 771 |
char *buffer; size_t size; |
37607102c seq_file: provide... |
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 |
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; } |
8b91a318e fs/seq_file: use ... |
792 |
size = seq_get_buf(m, &buffer); |
37607102c seq_file: provide... |
793 |
ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, |
8b91a318e fs/seq_file: use ... |
794 795 796 797 798 |
buffer, size, ascii); seq_commit(m, ret < size ? ret : -1); seq_putc(m, ' '); |
37607102c seq_file: provide... |
799 800 801 |
} } EXPORT_SYMBOL(seq_hex_dump); |
bcf67e162 Make common helpe... |
802 803 804 805 806 807 808 809 810 811 |
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; } |
bcf67e162 Make common helpe... |
812 813 814 815 816 817 818 819 820 |
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); } |
bcf67e162 Make common helpe... |
821 822 823 824 825 826 827 828 829 830 |
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; } |
bcf67e162 Make common helpe... |
831 |
EXPORT_SYMBOL(seq_list_next); |
66655de6d seq_file: Add hel... |
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 |
/** * 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 |
138860b95 seq_file: fix new... |
872 |
* @ppos: the current position |
66655de6d seq_file: Add hel... |
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 |
* * 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); |
1cc523271 seq_file: add RCU... |
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 |
/** * 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 |
138860b95 seq_file: fix new... |
938 |
* @ppos: the current position |
1cc523271 seq_file: add RCU... |
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 |
* * 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); |
0bc77381c seq_file: add seq... |
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 |
/** * seq_hlist_start_precpu - 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); |