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Diffstat (limited to 'fs/seq_file.c')
-rw-r--r--fs/seq_file.c51
1 files changed, 21 insertions, 30 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 225586e141ca..e85664b7c7d9 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -13,6 +13,7 @@
#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>
@@ -25,12 +26,17 @@ static void seq_set_overflow(struct seq_file *m)
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;
@@ -377,26 +383,12 @@ EXPORT_SYMBOL(seq_release);
*/
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;
- }
- m->count = p - m->buf;
+ ret = string_escape_str(s, buf, size, ESCAPE_OCTAL, esc);
+ seq_commit(m, ret < size ? ret : -1);
}
EXPORT_SYMBOL(seq_escape);
@@ -773,6 +765,8 @@ void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
{
const u8 *ptr = buf;
int i, linelen, remaining = len;
+ char *buffer;
+ size_t size;
int ret;
if (rowsize != 16 && rowsize != 32)
@@ -794,15 +788,12 @@ void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
break;
}
+ size = seq_get_buf(m, &buffer);
ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
- m->buf + m->count, m->size - m->count,
- ascii);
- if (ret >= m->size - m->count) {
- seq_set_overflow(m);
- } else {
- m->count += ret;
- seq_putc(m, '\n');
- }
+ buffer, size, ascii);
+ seq_commit(m, ret < size ? ret : -1);
+
+ seq_putc(m, '\n');
}
}
EXPORT_SYMBOL(seq_hex_dump);