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Subject[PATCH v4 34/34] Delete seq_buf
Date
No longer has any users, so delete it.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
---
include/linux/seq_buf.h | 162 ----------------
lib/Makefile | 2 +-
lib/seq_buf.c | 397 ----------------------------------------
3 files changed, 1 insertion(+), 560 deletions(-)
delete mode 100644 include/linux/seq_buf.h
delete mode 100644 lib/seq_buf.c

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
deleted file mode 100644
index 5b31c51479..0000000000
--- a/include/linux/seq_buf.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_SEQ_BUF_H
-#define _LINUX_SEQ_BUF_H
-
-#include <linux/fs.h>
-
-/*
- * Trace sequences are used to allow a function to call several other functions
- * to create a string of data to use.
- */
-
-/**
- * seq_buf - seq buffer structure
- * @buffer: pointer to the buffer
- * @size: size of the buffer
- * @len: the amount of data inside the buffer
- * @readpos: The next position to read in the buffer.
- */
-struct seq_buf {
- char *buffer;
- size_t size;
- size_t len;
- loff_t readpos;
-};
-
-static inline void seq_buf_clear(struct seq_buf *s)
-{
- s->len = 0;
- s->readpos = 0;
-}
-
-static inline void
-seq_buf_init(struct seq_buf *s, char *buf, unsigned int size)
-{
- s->buffer = buf;
- s->size = size;
- seq_buf_clear(s);
-}
-
-/*
- * seq_buf have a buffer that might overflow. When this happens
- * the len and size are set to be equal.
- */
-static inline bool
-seq_buf_has_overflowed(struct seq_buf *s)
-{
- return s->len > s->size;
-}
-
-static inline void
-seq_buf_set_overflow(struct seq_buf *s)
-{
- s->len = s->size + 1;
-}
-
-/*
- * How much buffer is left on the seq_buf?
- */
-static inline unsigned int
-seq_buf_buffer_left(struct seq_buf *s)
-{
- if (seq_buf_has_overflowed(s))
- return 0;
-
- return s->size - s->len;
-}
-
-/* How much buffer was written? */
-static inline unsigned int seq_buf_used(struct seq_buf *s)
-{
- return min(s->len, s->size);
-}
-
-/**
- * seq_buf_terminate - Make sure buffer is nul terminated
- * @s: the seq_buf descriptor to terminate.
- *
- * This makes sure that the buffer in @s is nul terminated and
- * safe to read as a string.
- *
- * Note, if this is called when the buffer has overflowed, then
- * the last byte of the buffer is zeroed, and the len will still
- * point passed it.
- *
- * After this function is called, s->buffer is safe to use
- * in string operations.
- */
-static inline void seq_buf_terminate(struct seq_buf *s)
-{
- if (WARN_ON(s->size == 0))
- return;
-
- if (seq_buf_buffer_left(s))
- s->buffer[s->len] = 0;
- else
- s->buffer[s->size - 1] = 0;
-}
-
-/**
- * seq_buf_get_buf - get buffer to write arbitrary data to
- * @s: the seq_buf handle
- * @bufp: the beginning of the buffer is stored here
- *
- * Return the number of bytes available in the buffer, or zero if
- * there's no space.
- */
-static inline size_t seq_buf_get_buf(struct seq_buf *s, char **bufp)
-{
- WARN_ON(s->len > s->size + 1);
-
- if (s->len < s->size) {
- *bufp = s->buffer + s->len;
- return s->size - s->len;
- }
-
- *bufp = NULL;
- return 0;
-}
-
-/**
- * seq_buf_commit - commit data to the buffer
- * @s: the seq_buf handle
- * @num: the number of bytes to commit
- *
- * Commit @num bytes of data written to a buffer previously acquired
- * by seq_buf_get. To signal an error condition, or that the data
- * didn't fit in the available space, pass a negative @num value.
- */
-static inline void seq_buf_commit(struct seq_buf *s, int num)
-{
- if (num < 0) {
- seq_buf_set_overflow(s);
- } else {
- /* num must be negative on overflow */
- BUG_ON(s->len + num > s->size);
- s->len += num;
- }
-}
-
-extern __printf(2, 3)
-int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
-extern __printf(2, 0)
-int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args);
-extern int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s);
-extern int seq_buf_to_user(struct seq_buf *s, char __user *ubuf,
- int cnt);
-extern int seq_buf_puts(struct seq_buf *s, const char *str);
-extern int seq_buf_putc(struct seq_buf *s, unsigned char c);
-extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
-extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
- unsigned int len);
-extern int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc);
-extern int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str,
- int prefix_type, int rowsize, int groupsize,
- const void *buf, size_t len, bool ascii);
-
-#ifdef CONFIG_BINARY_PRINTF
-extern int
-seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
-#endif
-
-#endif /* _LINUX_SEQ_BUF_H */
diff --git a/lib/Makefile b/lib/Makefile
index b520024852..f8ad89dc9a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -32,7 +32,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
idr.o extable.o sha1.o irq_regs.o argv_split.o \
flex_proportions.o ratelimit.o show_mem.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
- earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
+ earlycpio.o siphash.o dec_and_lock.o \
nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o \
buildid.o printbuf.o pretty-printers.o

diff --git a/lib/seq_buf.c b/lib/seq_buf.c
deleted file mode 100644
index 0a68f7aa85..0000000000
--- a/lib/seq_buf.c
+++ /dev/null
@@ -1,397 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * seq_buf.c
- *
- * Copyright (C) 2014 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
- *
- * The seq_buf is a handy tool that allows you to pass a descriptor around
- * to a buffer that other functions can write to. It is similar to the
- * seq_file functionality but has some differences.
- *
- * To use it, the seq_buf must be initialized with seq_buf_init().
- * This will set up the counters within the descriptor. You can call
- * seq_buf_init() more than once to reset the seq_buf to start
- * from scratch.
- */
-#include <linux/uaccess.h>
-#include <linux/seq_file.h>
-#include <linux/seq_buf.h>
-
-/**
- * seq_buf_can_fit - can the new data fit in the current buffer?
- * @s: the seq_buf descriptor
- * @len: The length to see if it can fit in the current buffer
- *
- * Returns true if there's enough unused space in the seq_buf buffer
- * to fit the amount of new data according to @len.
- */
-static bool seq_buf_can_fit(struct seq_buf *s, size_t len)
-{
- return s->len + len <= s->size;
-}
-
-/**
- * seq_buf_print_seq - move the contents of seq_buf into a seq_file
- * @m: the seq_file descriptor that is the destination
- * @s: the seq_buf descriptor that is the source.
- *
- * Returns zero on success, non zero otherwise
- */
-int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s)
-{
- unsigned int len = seq_buf_used(s);
-
- return seq_write(m, s->buffer, len);
-}
-
-/**
- * seq_buf_vprintf - sequence printing of information.
- * @s: seq_buf descriptor
- * @fmt: printf format string
- * @args: va_list of arguments from a printf() type function
- *
- * Writes a vnprintf() format into the sequencce buffer.
- *
- * Returns zero on success, -1 on overflow.
- */
-int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args)
-{
- int len;
-
- WARN_ON(s->size == 0);
-
- if (s->len < s->size) {
- len = vsnprintf(s->buffer + s->len, s->size - s->len, fmt, args);
- if (s->len + len < s->size) {
- s->len += len;
- return 0;
- }
- }
- seq_buf_set_overflow(s);
- return -1;
-}
-
-/**
- * seq_buf_printf - sequence printing of information
- * @s: seq_buf descriptor
- * @fmt: printf format string
- *
- * Writes a printf() format into the sequence buffer.
- *
- * Returns zero on success, -1 on overflow.
- */
-int seq_buf_printf(struct seq_buf *s, const char *fmt, ...)
-{
- va_list ap;
- int ret;
-
- va_start(ap, fmt);
- ret = seq_buf_vprintf(s, fmt, ap);
- va_end(ap);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(seq_buf_printf);
-
-#ifdef CONFIG_BINARY_PRINTF
-/**
- * seq_buf_bprintf - Write the printf string from binary arguments
- * @s: seq_buf descriptor
- * @fmt: The format string for the @binary arguments
- * @binary: The binary arguments for @fmt.
- *
- * When recording in a fast path, a printf may be recorded with just
- * saving the format and the arguments as they were passed to the
- * function, instead of wasting cycles converting the arguments into
- * ASCII characters. Instead, the arguments are saved in a 32 bit
- * word array that is defined by the format string constraints.
- *
- * This function will take the format and the binary array and finish
- * the conversion into the ASCII string within the buffer.
- *
- * Returns zero on success, -1 on overflow.
- */
-int seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary)
-{
- unsigned int len = seq_buf_buffer_left(s);
- int ret;
-
- WARN_ON(s->size == 0);
-
- if (s->len < s->size) {
- ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
- if (s->len + ret < s->size) {
- s->len += ret;
- return 0;
- }
- }
- seq_buf_set_overflow(s);
- return -1;
-}
-#endif /* CONFIG_BINARY_PRINTF */
-
-/**
- * seq_buf_puts - sequence printing of simple string
- * @s: seq_buf descriptor
- * @str: simple string to record
- *
- * Copy a simple string into the sequence buffer.
- *
- * Returns zero on success, -1 on overflow
- */
-int seq_buf_puts(struct seq_buf *s, const char *str)
-{
- size_t len = strlen(str);
-
- WARN_ON(s->size == 0);
-
- /* Add 1 to len for the trailing null byte which must be there */
- len += 1;
-
- if (seq_buf_can_fit(s, len)) {
- memcpy(s->buffer + s->len, str, len);
- /* Don't count the trailing null byte against the capacity */
- s->len += len - 1;
- return 0;
- }
- seq_buf_set_overflow(s);
- return -1;
-}
-
-/**
- * seq_buf_putc - sequence printing of simple character
- * @s: seq_buf descriptor
- * @c: simple character to record
- *
- * Copy a single character into the sequence buffer.
- *
- * Returns zero on success, -1 on overflow
- */
-int seq_buf_putc(struct seq_buf *s, unsigned char c)
-{
- WARN_ON(s->size == 0);
-
- if (seq_buf_can_fit(s, 1)) {
- s->buffer[s->len++] = c;
- return 0;
- }
- seq_buf_set_overflow(s);
- return -1;
-}
-
-/**
- * seq_buf_putmem - write raw data into the sequenc buffer
- * @s: seq_buf descriptor
- * @mem: The raw memory to copy into the buffer
- * @len: The length of the raw memory to copy (in bytes)
- *
- * There may be cases where raw memory needs to be written into the
- * buffer and a strcpy() would not work. Using this function allows
- * for such cases.
- *
- * Returns zero on success, -1 on overflow
- */
-int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len)
-{
- WARN_ON(s->size == 0);
-
- if (seq_buf_can_fit(s, len)) {
- memcpy(s->buffer + s->len, mem, len);
- s->len += len;
- return 0;
- }
- seq_buf_set_overflow(s);
- return -1;
-}
-
-#define MAX_MEMHEX_BYTES 8U
-#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
-
-/**
- * seq_buf_putmem_hex - write raw memory into the buffer in ASCII hex
- * @s: seq_buf descriptor
- * @mem: The raw memory to write its hex ASCII representation of
- * @len: The length of the raw memory to copy (in bytes)
- *
- * This is similar to seq_buf_putmem() except instead of just copying the
- * raw memory into the buffer it writes its ASCII representation of it
- * in hex characters.
- *
- * Returns zero on success, -1 on overflow
- */
-int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
- unsigned int len)
-{
- unsigned char hex[HEX_CHARS];
- const unsigned char *data = mem;
- unsigned int start_len;
- int i, j;
-
- WARN_ON(s->size == 0);
-
- BUILD_BUG_ON(MAX_MEMHEX_BYTES * 2 >= HEX_CHARS);
-
- while (len) {
- start_len = min(len, MAX_MEMHEX_BYTES);
-#ifdef __BIG_ENDIAN
- for (i = 0, j = 0; i < start_len; i++) {
-#else
- for (i = start_len-1, j = 0; i >= 0; i--) {
-#endif
- hex[j++] = hex_asc_hi(data[i]);
- hex[j++] = hex_asc_lo(data[i]);
- }
- if (WARN_ON_ONCE(j == 0 || j/2 > len))
- break;
-
- /* j increments twice per loop */
- hex[j++] = ' ';
-
- seq_buf_putmem(s, hex, j);
- if (seq_buf_has_overflowed(s))
- return -1;
-
- len -= start_len;
- data += start_len;
- }
- return 0;
-}
-
-/**
- * seq_buf_path - copy a path into the sequence buffer
- * @s: seq_buf descriptor
- * @path: path to write into the sequence buffer.
- * @esc: set of characters to escape in the output
- *
- * Write a path name into the sequence buffer.
- *
- * Returns the number of written bytes on success, -1 on overflow
- */
-int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc)
-{
- char *buf;
- size_t size = seq_buf_get_buf(s, &buf);
- int res = -1;
-
- WARN_ON(s->size == 0);
-
- 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_buf_commit(s, res);
-
- return res;
-}
-
-/**
- * seq_buf_to_user - copy the sequence buffer to user space
- * @s: seq_buf descriptor
- * @ubuf: The userspace memory location to copy to
- * @cnt: The amount to copy
- *
- * Copies the sequence buffer into the userspace memory pointed to
- * by @ubuf. It starts from the last read position (@s->readpos)
- * and writes up to @cnt characters or till it reaches the end of
- * the content in the buffer (@s->len), which ever comes first.
- *
- * On success, it returns a positive number of the number of bytes
- * it copied.
- *
- * On failure it returns -EBUSY if all of the content in the
- * sequence has been already read, which includes nothing in the
- * sequence (@s->len == @s->readpos).
- *
- * Returns -EFAULT if the copy to userspace fails.
- */
-int seq_buf_to_user(struct seq_buf *s, char __user *ubuf, int cnt)
-{
- int len;
- int ret;
-
- if (!cnt)
- return 0;
-
- len = seq_buf_used(s);
-
- if (len <= s->readpos)
- return -EBUSY;
-
- len -= s->readpos;
- if (cnt > len)
- cnt = len;
- ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt);
- if (ret == cnt)
- return -EFAULT;
-
- cnt -= ret;
-
- s->readpos += cnt;
- return cnt;
-}
-
-/**
- * seq_buf_hex_dump - print formatted hex dump into the sequence buffer
- * @s: seq_buf descriptor
- * @prefix_str: string to prefix each line with;
- * caller supplies trailing spaces for alignment if desired
- * @prefix_type: controls whether prefix of an offset, address, or none
- * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
- * @rowsize: number of bytes to print per line; must be 16 or 32
- * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
- * @buf: data blob to dump
- * @len: number of bytes in the @buf
- * @ascii: include ASCII after the hex output
- *
- * Function is an analogue of print_hex_dump() and thus has similar interface.
- *
- * linebuf size is maximal length for one line.
- * 32 * 3 - maximum bytes per line, each printed into 2 chars + 1 for
- * separating space
- * 2 - spaces separating hex dump and ascii representation
- * 32 - ascii representation
- * 1 - terminating '\0'
- *
- * Returns zero on success, -1 on overflow
- */
-int seq_buf_hex_dump(struct seq_buf *s, 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;
- unsigned char linebuf[32 * 3 + 2 + 32 + 1];
- int ret;
-
- if (rowsize != 16 && rowsize != 32)
- rowsize = 16;
-
- for (i = 0; i < len; i += rowsize) {
- linelen = min(remaining, rowsize);
- remaining -= rowsize;
-
- hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
- linebuf, sizeof(linebuf), ascii);
-
- switch (prefix_type) {
- case DUMP_PREFIX_ADDRESS:
- ret = seq_buf_printf(s, "%s%p: %s\n",
- prefix_str, ptr + i, linebuf);
- break;
- case DUMP_PREFIX_OFFSET:
- ret = seq_buf_printf(s, "%s%.8x: %s\n",
- prefix_str, i, linebuf);
- break;
- default:
- ret = seq_buf_printf(s, "%s%s\n", prefix_str, linebuf);
- break;
- }
- if (ret)
- return ret;
- }
- return 0;
-}
--
2.36.1
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