2009-08-22 21:27:40 +04:00
|
|
|
/*
|
|
|
|
* blkmap64_ba.c --- Simple bitarray implementation for bitmaps
|
|
|
|
*
|
|
|
|
* Copyright (C) 2008 Theodore Ts'o.
|
|
|
|
*
|
|
|
|
* %Begin-Header%
|
|
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
|
|
* License.
|
|
|
|
* %End-Header%
|
|
|
|
*/
|
|
|
|
|
2011-09-19 01:34:37 +04:00
|
|
|
#include "config.h"
|
2009-08-22 21:27:40 +04:00
|
|
|
#include <stdio.h>
|
|
|
|
#include <string.h>
|
|
|
|
#if HAVE_UNISTD_H
|
|
|
|
#include <unistd.h>
|
|
|
|
#endif
|
|
|
|
#include <fcntl.h>
|
|
|
|
#include <time.h>
|
|
|
|
#if HAVE_SYS_STAT_H
|
|
|
|
#include <sys/stat.h>
|
|
|
|
#endif
|
|
|
|
#if HAVE_SYS_TYPES_H
|
|
|
|
#include <sys/types.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include "ext2_fs.h"
|
|
|
|
#include "ext2fsP.h"
|
|
|
|
#include "bmap64.h"
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Private data for bit array implementation of bitmap ops.
|
|
|
|
* Currently, this is just a pointer to our big flat hunk of memory,
|
|
|
|
* exactly equivalent to the old-skool char * bitmap member.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct ext2fs_ba_private_struct {
|
|
|
|
char *bitarray;
|
|
|
|
};
|
|
|
|
|
|
|
|
typedef struct ext2fs_ba_private_struct *ext2fs_ba_private;
|
|
|
|
|
|
|
|
static errcode_t ba_alloc_private_data (ext2fs_generic_bitmap bitmap)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp;
|
|
|
|
errcode_t retval;
|
|
|
|
size_t size;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Since we only have the one pointer, we could just shove our
|
|
|
|
* private data in the void *private field itself, but then
|
|
|
|
* we'd have to do a fair bit of rewriting if we ever added a
|
|
|
|
* field. I'm agnostic.
|
|
|
|
*/
|
|
|
|
retval = ext2fs_get_mem(sizeof (ext2fs_ba_private), &bp);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
|
|
|
|
|
|
|
|
retval = ext2fs_get_mem(size, &bp->bitarray);
|
|
|
|
if (retval) {
|
|
|
|
ext2fs_free_mem(&bp);
|
|
|
|
bp = 0;
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
bitmap->private = (void *) bp;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t ba_new_bmap(ext2_filsys fs EXT2FS_ATTR((unused)),
|
|
|
|
ext2fs_generic_bitmap bitmap)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp;
|
|
|
|
errcode_t retval;
|
|
|
|
size_t size;
|
|
|
|
|
|
|
|
retval = ba_alloc_private_data (bitmap);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
|
|
|
|
memset(bp->bitarray, 0, size);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ba_free_bmap(ext2fs_generic_bitmap bitmap)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
|
|
|
|
if (!bp)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (bp->bitarray) {
|
|
|
|
ext2fs_free_mem (&bp->bitarray);
|
|
|
|
bp->bitarray = 0;
|
|
|
|
}
|
|
|
|
ext2fs_free_mem (&bp);
|
|
|
|
bp = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t ba_copy_bmap(ext2fs_generic_bitmap src,
|
|
|
|
ext2fs_generic_bitmap dest)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private src_bp = (ext2fs_ba_private) src->private;
|
|
|
|
ext2fs_ba_private dest_bp;
|
|
|
|
errcode_t retval;
|
|
|
|
size_t size;
|
|
|
|
|
|
|
|
retval = ba_alloc_private_data (dest);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
dest_bp = (ext2fs_ba_private) dest->private;
|
|
|
|
|
|
|
|
size = (size_t) (((src->real_end - src->start) / 8) + 1);
|
|
|
|
memcpy (dest_bp->bitarray, src_bp->bitarray, size);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t ba_resize_bmap(ext2fs_generic_bitmap bmap,
|
|
|
|
__u64 new_end, __u64 new_real_end)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bmap->private;
|
|
|
|
errcode_t retval;
|
|
|
|
size_t size, new_size;
|
|
|
|
__u64 bitno;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If we're expanding the bitmap, make sure all of the new
|
|
|
|
* parts of the bitmap are zero.
|
|
|
|
*/
|
|
|
|
if (new_end > bmap->end) {
|
|
|
|
bitno = bmap->real_end;
|
|
|
|
if (bitno > new_end)
|
|
|
|
bitno = new_end;
|
|
|
|
for (; bitno > bmap->end; bitno--)
|
|
|
|
ext2fs_clear_bit64(bitno - bmap->start, bp->bitarray);
|
|
|
|
}
|
|
|
|
if (new_real_end == bmap->real_end) {
|
|
|
|
bmap->end = new_end;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
size = ((bmap->real_end - bmap->start) / 8) + 1;
|
|
|
|
new_size = ((new_real_end - bmap->start) / 8) + 1;
|
|
|
|
|
|
|
|
if (size != new_size) {
|
|
|
|
retval = ext2fs_resize_mem(size, new_size, &bp->bitarray);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
if (new_size > size)
|
|
|
|
memset(bp->bitarray + size, 0, new_size - size);
|
|
|
|
|
|
|
|
bmap->end = new_end;
|
|
|
|
bmap->real_end = new_real_end;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ba_mark_bmap(ext2fs_generic_bitmap bitmap, __u64 arg)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
blk64_t bitno = (blk64_t) arg;
|
|
|
|
|
|
|
|
return ext2fs_set_bit64(bitno - bitmap->start, bp->bitarray);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ba_unmark_bmap(ext2fs_generic_bitmap bitmap, __u64 arg)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
blk64_t bitno = (blk64_t) arg;
|
|
|
|
|
|
|
|
return ext2fs_clear_bit64(bitno - bitmap->start, bp->bitarray);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ba_test_bmap(ext2fs_generic_bitmap bitmap, __u64 arg)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
blk64_t bitno = (blk64_t) arg;
|
|
|
|
|
|
|
|
return ext2fs_test_bit64(bitno - bitmap->start, bp->bitarray);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ba_mark_bmap_extent(ext2fs_generic_bitmap bitmap, __u64 arg,
|
|
|
|
unsigned int num)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
blk64_t bitno = (blk64_t) arg;
|
|
|
|
unsigned int i;
|
|
|
|
|
|
|
|
for (i = 0; i < num; i++)
|
|
|
|
ext2fs_fast_set_bit64(bitno + i - bitmap->start, bp->bitarray);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ba_unmark_bmap_extent(ext2fs_generic_bitmap bitmap, __u64 arg,
|
|
|
|
unsigned int num)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
blk64_t bitno = (blk64_t) arg;
|
|
|
|
unsigned int i;
|
|
|
|
|
|
|
|
for (i = 0; i < num; i++)
|
|
|
|
ext2fs_fast_clear_bit64(bitno + i - bitmap->start, bp->bitarray);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ba_test_clear_bmap_extent(ext2fs_generic_bitmap bitmap,
|
|
|
|
__u64 start, unsigned int len)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
__u64 start_byte, len_byte = len >> 3;
|
|
|
|
unsigned int start_bit, len_bit = len % 8;
|
|
|
|
unsigned int first_bit = 0;
|
|
|
|
unsigned int last_bit = 0;
|
|
|
|
int mark_count = 0;
|
|
|
|
int mark_bit = 0;
|
|
|
|
int i;
|
|
|
|
const char *ADDR;
|
|
|
|
|
|
|
|
ADDR = bp->bitarray;
|
|
|
|
start -= bitmap->start;
|
|
|
|
start_byte = start >> 3;
|
|
|
|
start_bit = start % 8;
|
|
|
|
|
|
|
|
if (start_bit != 0) {
|
|
|
|
/*
|
|
|
|
* The compared start block number or start inode number
|
|
|
|
* is not the first bit in a byte.
|
|
|
|
*/
|
|
|
|
mark_count = 8 - start_bit;
|
|
|
|
if (len < 8 - start_bit) {
|
|
|
|
mark_count = (int)len;
|
|
|
|
mark_bit = len + start_bit - 1;
|
|
|
|
} else
|
|
|
|
mark_bit = 7;
|
|
|
|
|
|
|
|
for (i = mark_count; i > 0; i--, mark_bit--)
|
|
|
|
first_bit |= 1 << mark_bit;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Compare blocks or inodes in the first byte.
|
|
|
|
* If there is any marked bit, this function returns 0.
|
|
|
|
*/
|
|
|
|
if (first_bit & ADDR[start_byte])
|
|
|
|
return 0;
|
|
|
|
else if (len <= 8 - start_bit)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
start_byte++;
|
|
|
|
len_bit = (len - mark_count) % 8;
|
|
|
|
len_byte = (len - mark_count) >> 3;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The compared start block number or start inode number is
|
|
|
|
* the first bit in a byte.
|
|
|
|
*/
|
|
|
|
if (len_bit != 0) {
|
|
|
|
/*
|
|
|
|
* The compared end block number or end inode number is
|
|
|
|
* not the last bit in a byte.
|
|
|
|
*/
|
|
|
|
for (mark_bit = len_bit - 1; mark_bit >= 0; mark_bit--)
|
|
|
|
last_bit |= 1 << mark_bit;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Compare blocks or inodes in the last byte.
|
|
|
|
* If there is any marked bit, this function returns 0.
|
|
|
|
*/
|
|
|
|
if (last_bit & ADDR[start_byte + len_byte])
|
|
|
|
return 0;
|
|
|
|
else if (len_byte == 0)
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check whether all bytes are 0 */
|
|
|
|
return ext2fs_mem_is_zero(ADDR + start_byte, len_byte);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static errcode_t ba_set_bmap_range(ext2fs_generic_bitmap bitmap,
|
|
|
|
__u64 start, size_t num, void *in)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
|
|
|
|
memcpy (bp->bitarray + (start >> 3), in, (num + 7) >> 3);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t ba_get_bmap_range(ext2fs_generic_bitmap bitmap,
|
|
|
|
__u64 start, size_t num, void *out)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
|
|
|
|
memcpy (out, bp->bitarray + (start >> 3), (num + 7) >> 3);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ba_clear_bmap(ext2fs_generic_bitmap bitmap)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private) bitmap->private;
|
|
|
|
|
|
|
|
memset(bp->bitarray, 0,
|
|
|
|
(size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
|
|
|
|
}
|
|
|
|
|
2012-07-30 22:51:31 +04:00
|
|
|
#ifdef ENABLE_BMAP_STATS
|
2011-12-17 02:31:07 +04:00
|
|
|
static void ba_print_stats(ext2fs_generic_bitmap bitmap)
|
|
|
|
{
|
|
|
|
fprintf(stderr, "%16llu Bytes used by bitarray\n",
|
|
|
|
((bitmap->real_end - bitmap->start) >> 3) + 1 +
|
|
|
|
sizeof(struct ext2fs_ba_private_struct));
|
|
|
|
}
|
2012-07-30 22:51:31 +04:00
|
|
|
#else
|
|
|
|
static void ba_print_stats(ext2fs_generic_bitmap bitmap) {}
|
|
|
|
#endif
|
2011-12-17 02:31:07 +04:00
|
|
|
|
2012-03-11 01:38:40 +04:00
|
|
|
/* Find the first zero bit between start and end, inclusive. */
|
|
|
|
static errcode_t ba_find_first_zero(ext2fs_generic_bitmap bitmap,
|
|
|
|
__u64 start, __u64 end, __u64 *out)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private)bitmap->private;
|
|
|
|
unsigned long bitpos = start - bitmap->start;
|
|
|
|
unsigned long count = end - start + 1;
|
|
|
|
int byte_found = 0; /* whether a != 0xff byte has been found */
|
|
|
|
const unsigned char *pos;
|
|
|
|
unsigned long max_loop_count, i;
|
|
|
|
|
|
|
|
/* scan bits until we hit a byte boundary */
|
|
|
|
while ((bitpos & 0x7) != 0 && count > 0) {
|
|
|
|
if (!ext2fs_test_bit64(bitpos, bp->bitarray)) {
|
|
|
|
*out = bitpos + bitmap->start;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
bitpos++;
|
|
|
|
count--;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!count)
|
|
|
|
return ENOENT;
|
|
|
|
|
|
|
|
pos = ((unsigned char *)bp->bitarray) + (bitpos >> 3);
|
|
|
|
/* scan bytes until 8-byte (64-bit) aligned */
|
|
|
|
while (count >= 8 && (((unsigned long)pos) & 0x07)) {
|
|
|
|
if (*pos != 0xff) {
|
|
|
|
byte_found = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
pos++;
|
|
|
|
count -= 8;
|
|
|
|
bitpos += 8;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!byte_found) {
|
|
|
|
max_loop_count = count >> 6; /* 8-byte blocks */
|
|
|
|
i = max_loop_count;
|
|
|
|
while (i) {
|
|
|
|
if (*((const __u64 *)pos) != ((__u64)-1))
|
|
|
|
break;
|
|
|
|
pos += 8;
|
|
|
|
i--;
|
|
|
|
}
|
|
|
|
count -= 64 * (max_loop_count - i);
|
|
|
|
bitpos += 64 * (max_loop_count - i);
|
|
|
|
|
|
|
|
max_loop_count = count >> 3;
|
|
|
|
i = max_loop_count;
|
|
|
|
while (i) {
|
|
|
|
if (*pos != 0xff) {
|
|
|
|
byte_found = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
pos++;
|
|
|
|
i--;
|
|
|
|
}
|
|
|
|
count -= 8 * (max_loop_count - i);
|
|
|
|
bitpos += 8 * (max_loop_count - i);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Here either count < 8 or byte_found == 1. */
|
|
|
|
while (count-- > 0) {
|
|
|
|
if (!ext2fs_test_bit64(bitpos, bp->bitarray)) {
|
|
|
|
*out = bitpos + bitmap->start;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
bitpos++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ENOENT;
|
|
|
|
}
|
|
|
|
|
2014-01-13 06:45:04 +04:00
|
|
|
/* Find the first one bit between start and end, inclusive. */
|
|
|
|
static errcode_t ba_find_first_set(ext2fs_generic_bitmap bitmap,
|
|
|
|
__u64 start, __u64 end, __u64 *out)
|
|
|
|
{
|
|
|
|
ext2fs_ba_private bp = (ext2fs_ba_private)bitmap->private;
|
|
|
|
unsigned long bitpos = start - bitmap->start;
|
|
|
|
unsigned long count = end - start + 1;
|
|
|
|
int byte_found = 0; /* whether a != 0xff byte has been found */
|
|
|
|
const unsigned char *pos;
|
|
|
|
unsigned long max_loop_count, i;
|
|
|
|
|
|
|
|
/* scan bits until we hit a byte boundary */
|
|
|
|
while ((bitpos & 0x7) != 0 && count > 0) {
|
|
|
|
if (ext2fs_test_bit64(bitpos, bp->bitarray)) {
|
|
|
|
*out = bitpos + bitmap->start;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
bitpos++;
|
|
|
|
count--;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!count)
|
|
|
|
return ENOENT;
|
|
|
|
|
|
|
|
pos = ((unsigned char *)bp->bitarray) + (bitpos >> 3);
|
|
|
|
/* scan bytes until 8-byte (64-bit) aligned */
|
|
|
|
while (count >= 8 && (((unsigned long)pos) & 0x07)) {
|
|
|
|
if (*pos != 0) {
|
|
|
|
byte_found = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
pos++;
|
|
|
|
count -= 8;
|
|
|
|
bitpos += 8;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!byte_found) {
|
|
|
|
max_loop_count = count >> 6; /* 8-byte blocks */
|
|
|
|
i = max_loop_count;
|
|
|
|
while (i) {
|
|
|
|
if (*((const __u64 *)pos) != 0)
|
|
|
|
break;
|
|
|
|
pos += 8;
|
|
|
|
i--;
|
|
|
|
}
|
|
|
|
count -= 64 * (max_loop_count - i);
|
|
|
|
bitpos += 64 * (max_loop_count - i);
|
|
|
|
|
|
|
|
max_loop_count = count >> 3;
|
|
|
|
i = max_loop_count;
|
|
|
|
while (i) {
|
|
|
|
if (*pos != 0) {
|
|
|
|
byte_found = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
pos++;
|
|
|
|
i--;
|
|
|
|
}
|
|
|
|
count -= 8 * (max_loop_count - i);
|
|
|
|
bitpos += 8 * (max_loop_count - i);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Here either count < 8 or byte_found == 1. */
|
|
|
|
while (count-- > 0) {
|
|
|
|
if (ext2fs_test_bit64(bitpos, bp->bitarray)) {
|
|
|
|
*out = bitpos + bitmap->start;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
bitpos++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ENOENT;
|
|
|
|
}
|
|
|
|
|
2009-08-22 21:27:40 +04:00
|
|
|
struct ext2_bitmap_ops ext2fs_blkmap64_bitarray = {
|
|
|
|
.type = EXT2FS_BMAP64_BITARRAY,
|
|
|
|
.new_bmap = ba_new_bmap,
|
|
|
|
.free_bmap = ba_free_bmap,
|
|
|
|
.copy_bmap = ba_copy_bmap,
|
|
|
|
.resize_bmap = ba_resize_bmap,
|
|
|
|
.mark_bmap = ba_mark_bmap,
|
|
|
|
.unmark_bmap = ba_unmark_bmap,
|
|
|
|
.test_bmap = ba_test_bmap,
|
|
|
|
.test_clear_bmap_extent = ba_test_clear_bmap_extent,
|
|
|
|
.mark_bmap_extent = ba_mark_bmap_extent,
|
|
|
|
.unmark_bmap_extent = ba_unmark_bmap_extent,
|
|
|
|
.set_bmap_range = ba_set_bmap_range,
|
|
|
|
.get_bmap_range = ba_get_bmap_range,
|
|
|
|
.clear_bmap = ba_clear_bmap,
|
2011-12-17 02:31:07 +04:00
|
|
|
.print_stats = ba_print_stats,
|
2014-01-13 06:45:04 +04:00
|
|
|
.find_first_zero = ba_find_first_zero,
|
|
|
|
.find_first_set = ba_find_first_set
|
2009-08-22 21:27:40 +04:00
|
|
|
};
|