#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/mm.h>
+#include <linux/printk.h>
+#include <linux/string_helpers.h>
#include <asm/uaccess.h>
#include <asm/page.h>
static void *seq_buf_alloc(unsigned long size)
{
void *buf;
+ gfp_t gfp = GFP_KERNEL;
/*
- * __GFP_NORETRY to avoid oom-killings with high-order allocations -
- * it's better to fall back to vmalloc() than to kill things.
+ * For high order allocations, use __GFP_NORETRY to avoid oom-killing -
+ * it's better to fall back to vmalloc() than to kill things. For small
+ * allocations, just use GFP_KERNEL which will oom kill, thus no need
+ * for vmalloc fallback.
*/
- buf = kmalloc(size, GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
+ if (size > PAGE_SIZE)
+ gfp |= __GFP_NORETRY | __GFP_NOWARN;
+ buf = kmalloc(size, gfp);
if (!buf && size > PAGE_SIZE)
buf = vmalloc(size);
return buf;
* 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.
* Returning SEQ_SKIP means "discard this element and move on".
+ * Note: seq_open() will allocate a struct seq_file and store its
+ * pointer in @file->private_data. This pointer should not be modified.
*/
int seq_open(struct file *file, const struct seq_operations *op)
{
- struct seq_file *p = file->private_data;
+ struct seq_file *p;
+
+ WARN_ON(file->private_data);
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ file->private_data = p;
- if (!p) {
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
- file->private_data = p;
- }
- memset(p, 0, sizeof(*p));
mutex_init(&p->lock);
p->op = op;
#ifdef CONFIG_USER_NS
* @esc: set of characters that need escaping
*
* Puts string into buffer, replacing each occurrence of character from
- * @esc with usual octal escape. Returns 0 in case of success, -1 - in
- * case of overflow.
+ * @esc with usual octal escape.
+ * Use seq_has_overflowed() to check for errors.
*/
-int seq_escape(struct seq_file *m, const char *s, const char *esc)
+void seq_escape(struct seq_file *m, const char *s, const char *esc)
{
- char *end = m->buf + m->size;
- char *p;
- char c;
+ char *buf;
+ size_t size = seq_get_buf(m, &buf);
+ int ret;
- for (p = m->buf + m->count; (c = *s) != '\0' && p < end; s++) {
- if (!strchr(esc, c)) {
- *p++ = c;
- continue;
- }
- if (p + 3 < end) {
- *p++ = '\\';
- *p++ = '0' + ((c & 0300) >> 6);
- *p++ = '0' + ((c & 070) >> 3);
- *p++ = '0' + (c & 07);
- continue;
- }
- seq_set_overflow(m);
- return -1;
- }
- m->count = p - m->buf;
- return 0;
+ ret = string_escape_str(s, buf, size, ESCAPE_OCTAL, esc);
+ seq_commit(m, ret < size ? ret : -1);
}
EXPORT_SYMBOL(seq_escape);
-int seq_vprintf(struct seq_file *m, const char *f, va_list args)
+void seq_vprintf(struct seq_file *m, const char *f, va_list args)
{
int len;
len = vsnprintf(m->buf + m->count, m->size - m->count, f, args);
if (m->count + len < m->size) {
m->count += len;
- return 0;
+ return;
}
}
seq_set_overflow(m);
- return -1;
}
EXPORT_SYMBOL(seq_vprintf);
-int seq_printf(struct seq_file *m, const char *f, ...)
+void seq_printf(struct seq_file *m, const char *f, ...)
{
- int ret;
va_list args;
va_start(args, f);
- ret = seq_vprintf(m, f, args);
+ seq_vprintf(m, f, args);
va_end(args);
-
- return ret;
}
EXPORT_SYMBOL(seq_printf);
}
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.
*/
return res;
}
+EXPORT_SYMBOL(seq_dentry);
static void *single_start(struct seq_file *p, loff_t *pos)
{
}
EXPORT_SYMBOL(seq_open_private);
-int seq_putc(struct seq_file *m, char c)
+void seq_putc(struct seq_file *m, char c)
{
- if (m->count < m->size) {
- m->buf[m->count++] = c;
- return 0;
- }
- return -1;
+ if (m->count >= m->size)
+ return;
+
+ m->buf[m->count++] = c;
}
EXPORT_SYMBOL(seq_putc);
-int seq_puts(struct seq_file *m, const char *s)
+void seq_puts(struct seq_file *m, const char *s)
{
int len = strlen(s);
- if (m->count + len < m->size) {
- memcpy(m->buf + m->count, s, len);
- m->count += len;
- return 0;
+
+ if (m->count + len >= m->size) {
+ seq_set_overflow(m);
+ return;
}
- seq_set_overflow(m);
- return -1;
+ memcpy(m->buf + m->count, s, len);
+ m->count += len;
}
EXPORT_SYMBOL(seq_puts);
* 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.
*/
-int seq_put_decimal_ull(struct seq_file *m, char delimiter,
- unsigned long long num)
+void seq_put_decimal_ull(struct seq_file *m, char delimiter,
+ unsigned long long num)
{
int len;
if (num < 10) {
m->buf[m->count++] = num + '0';
- return 0;
+ return;
}
len = num_to_str(m->buf + m->count, m->size - m->count, num);
if (!len)
goto overflow;
m->count += len;
- return 0;
+ return;
+
overflow:
seq_set_overflow(m);
- return -1;
}
EXPORT_SYMBOL(seq_put_decimal_ull);
-int seq_put_decimal_ll(struct seq_file *m, char delimiter,
- long long num)
+void seq_put_decimal_ll(struct seq_file *m, char delimiter, long long num)
{
if (num < 0) {
if (m->count + 3 >= m->size) {
seq_set_overflow(m);
- return -1;
+ return;
}
if (delimiter)
m->buf[m->count++] = delimiter;
num = -num;
delimiter = '-';
}
- return seq_put_decimal_ull(m, delimiter, num);
-
+ seq_put_decimal_ull(m, delimiter, num);
}
EXPORT_SYMBOL(seq_put_decimal_ll);
}
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;
Code Review / kvmfornfv.git / blobdiff