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seq_file: provide an analogue of print_hex_dump() 

This introduces a new helper and switches current users to use it.  All
patches are compiled tested. kmemleak is tested via its own test suite.

This patch (of 6):

The new seq_hex_dump() is a complete analogue of print_hex_dump().

We have few users of this functionality already. It allows to reduce their
codebase.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Shevchenko 2015-09-09 15:38:33 -07:00 committed by Linus Torvalds
parent 40f705a736
commit 37607102c4
2 changed files with 46 additions and 0 deletions
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42
fs/seq_file.c
View File

@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/mm.h>
#include <linux/printk.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@ -773,6 +774,47 @@ void seq_pad(struct seq_file *m, char 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;
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;
}
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');
}
}
}
EXPORT_SYMBOL(seq_hex_dump);
struct list_head *seq_list_start(struct list_head *head, loff_t pos)
{
struct list_head *lh;

4
include/linux/seq_file.h
View File

@ -122,6 +122,10 @@ int seq_write(struct seq_file *seq, const void *data, size_t len);
__printf(2, 3) int seq_printf(struct seq_file *, const char *, ...);
__printf(2, 0) int seq_vprintf(struct seq_file *, const char *, va_list args);
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);
int seq_path(struct seq_file *, const struct path *, const char *);
int seq_file_path(struct seq_file *, struct file *, const char *);
int seq_dentry(struct seq_file *, struct dentry *, const char *);