- 根目录:
- fs
- udf
- balloc.c
/*
* balloc.c
*
* PURPOSE
* Block allocation handling routines for the OSTA-UDF(tm) filesystem.
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*
* (C) 1999-2001 Ben Fennema
* (C) 1999 Stelias Computing Inc
*
* HISTORY
*
* 02/24/99 blf Created.
*
*/
#include "udfdecl.h"
#include <linux/buffer_head.h>
#include <linux/bitops.h>
#include "udf_i.h"
#include "udf_sb.h"
#define udf_clear_bit __test_and_clear_bit_le
#define udf_set_bit __test_and_set_bit_le
#define udf_test_bit test_bit_le
#define udf_find_next_one_bit find_next_bit_le
static int read_block_bitmap(struct super_block *sb,
struct udf_bitmap *bitmap, unsigned int block,
unsigned long bitmap_nr)
{
struct buffer_head *bh = NULL;
int retval = 0;
struct kernel_lb_addr loc;
loc.logicalBlockNum = bitmap->s_extPosition;
loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
bh = udf_tread(sb, udf_get_lb_pblock(sb, &loc, block));
if (!bh)
retval = -EIO;
bitmap->s_block_bitmap[bitmap_nr] = bh;
return retval;
}
static int __load_block_bitmap(struct super_block *sb,
struct udf_bitmap *bitmap,
unsigned int block_group)
{
int retval = 0;
int nr_groups = bitmap->s_nr_groups;
if (block_group >= nr_groups) {
udf_debug("block_group (%d) > nr_groups (%d)\n",
block_group, nr_groups);
}
if (bitmap->s_block_bitmap[block_group]) {
return block_group;
} else {
retval = read_block_bitmap(sb, bitmap, block_group,
block_group);
if (retval < 0)
return retval;
return block_group;
}
}
static inline int load_block_bitmap(struct super_block *sb,
struct udf_bitmap *bitmap,
unsigned int block_group)
{
int slot;
slot = __load_block_bitmap(sb, bitmap, block_group);
if (slot < 0)
return slot;
if (!bitmap->s_block_bitmap[slot])
return -EIO;
return slot;
}
static void udf_add_free_space(struct super_block *sb, u16 partition, u32 cnt)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct logicalVolIntegrityDesc *lvid;
if (!sbi->s_lvid_bh)
return;
lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
le32_add_cpu(&lvid->freeSpaceTable[partition], cnt);
udf_updated_lvid(sb);
}
static void udf_bitmap_free_blocks(struct super_block *sb,
struct udf_bitmap *bitmap,
struct kernel_lb_addr *bloc,
uint32_t offset,
uint32_t count)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct buffer_head *bh = NULL;
struct udf_part_map *partmap;
unsigned long block;
unsigned long block_group;
unsigned long bit;
unsigned long i;
int bitmap_nr;
unsigned long overflow;
mutex_lock(&sbi->s_alloc_mutex);
partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
if (bloc->logicalBlockNum + count < count ||
(bloc->logicalBlockNum + count) > partmap->s_partition_len) {
udf_debug("%d < %d || %d + %d > %d\n",
bloc->logicalBlockNum, 0,
bloc->logicalBlockNum, count,
partmap->s_partition_len);
goto error_return;
}
block = bloc->logicalBlockNum + offset +
(sizeof(struct spaceBitmapDesc) << 3);
do {
overflow = 0;
block_group = block >> (sb->s_blocksize_bits + 3);
bit = block % (sb->s_blocksize << 3);
/*
* Check to see if we are freeing blocks across a group boundary.
*/
if (bit + count > (sb->s_blocksize << 3)) {
overflow = bit + count - (sb->s_blocksize << 3);
count -= overflow;
}
bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
if (bitmap_nr < 0)
goto error_return;
bh = bitmap->s_block_bitmap[bitmap_nr];
for (i = 0; i < count; i++) {
if (udf_set_bit(bit + i, bh->b_data)) {
udf_debug("bit %ld already set\n", bit + i);
udf_debug("byte=%2x\n",
((char *)bh->b_data)[(bit + i) >> 3]);
}
}
udf_add_free_space(sb, sbi->s_partition, count);
mark_buffer_dirty(bh);
if (overflow) {
block += count;
count = overflow;
}
} while (overflow);
error_return:
mutex_unlock(&sbi->s_alloc_mutex);
}
static int udf_bitmap_prealloc_blocks(struct super_block *sb,
struct udf_bitmap *bitmap,
uint16_t partition, uint32_t first_block,
uint32_t block_count)
{
struct udf_sb_info *sbi = UDF_SB(sb);
int alloc_count = 0;
int bit, block, block_group, group_start;
int nr_groups, bitmap_nr;
struct buffer_head *bh;
__u32 part_len;
mutex_lock(&sbi->s_alloc_mutex);
part_len = sbi->s_partmaps[partition].s_partition_len;
if (first_block >= part_len)
goto out;
if (first_block + block_count > part_len)
block_count = part_len - first_block;
do {
nr_groups = udf_compute_nr_groups(sb, partition);
block = first_block + (sizeof(struct spaceBitmapDesc) << 3);
block_group = block >> (sb->s_blocksize_bits + 3);
group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc);
bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
if (bitmap_nr < 0)
goto out;
bh = bitmap->s_block_bitmap[bitmap_nr];
bit = block % (sb->s_blocksize << 3);
while (bit < (sb->s_blocksize << 3) && block_count > 0) {
if (!udf_clear_bit(bit, bh->b_data))
goto out;
block_count--;
alloc_count++;
bit++;
block++;
}
mark_buffer_dirty(bh);
} while (block_count > 0);
out:
udf_add_free_space(sb, partition, -alloc_count);
mutex_unlock(&sbi->s_alloc_mutex);
return alloc_count;
}
static int udf_bitmap_new_block(struct super_block *sb,
struct udf_bitmap *bitmap, uint16_t partition,
uint32_t goal, int *err)
{
struct udf_sb_info *sbi = UDF_SB(sb);
int newbit, bit = 0, block, block_group, group_start;
int end_goal, nr_groups, bitmap_nr, i;
struct buffer_head *bh = NULL;
char *ptr;
int newblock = 0;
*err = -ENOSPC;
mutex_lock(&sbi->s_alloc_mutex);
repeat:
if (goal >= sbi->s_partmaps[partition].s_partition_len)
goal = 0;
nr_groups = bitmap->s_nr_groups;
block = goal + (sizeof(struct spaceBitmapDesc) << 3);
block_group = block >> (sb->s_blocksize_bits + 3);
group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc);
bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
if (bitmap_nr < 0)
goto error_return;
bh = bitmap->s_block_bitmap[bitmap_nr];
ptr = memscan((char *)bh->b_data + group_start, 0xFF,
sb->s_blocksize - group_start);
if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) {
bit = block % (sb->s_blocksize << 3);
if (udf_test_bit(bit, bh->b_data))
goto got_block;
end_goal = (bit + 63) & ~63;
bit = udf_find_next_one_bit(bh->b_data, end_goal, bit);
if (bit < end_goal)
goto got_block;
ptr = memscan((char *)bh->b_data + (bit >> 3), 0xFF,
sb->s_blocksize - ((bit + 7) >> 3));
newbit = (ptr - ((char *)bh->b_data)) << 3;
if (newbit < sb->s_blocksize << 3) {
bit = newbit;
goto search_back;
}
newbit = udf_find_next_one_bit(bh->b_data,
sb->s_blocksize << 3, bit);
if (newbit < sb->s_blocksize << 3) {
bit = newbit;
goto got_block;
}
}
for (i = 0; i < (nr_groups * 2); i++) {
block_group++;
if (block_group >= nr_groups)
block_group = 0;
group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc);
bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
if (bitmap_nr < 0)
goto error_return;
bh = bitmap->s_block_bitmap[bitmap_nr];
if (i < nr_groups) {
ptr = memscan((char *)bh->b_data + group_start, 0xFF,
sb->s_blocksize - group_start);
if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) {
bit = (ptr - ((char *)bh->b_data)) << 3;
break;
}
} else {
bit = udf_find_next_one_bit(bh->b_data,
sb->s_blocksize << 3,
group_start << 3);
if (bit < sb->s_blocksize << 3)
break;
}
}
if (i >= (nr_groups * 2)) {
mutex_unlock(&sbi->s_alloc_mutex);
return newblock;
}
if (bit < sb->s_blocksize << 3)
goto search_back;
else
bit = udf_find_next_one_bit(bh->b_data, sb->s_blocksize << 3,
group_start << 3);
if (bit >= sb->s_blocksize << 3) {
mutex_unlock(&sbi->s_alloc_mutex);
return 0;
}
search_back:
i = 0;
while (i < 7 && bit > (group_start << 3) &&
udf_test_bit(bit - 1, bh->b_data)) {
++i;
--bit;
}
got_block:
newblock = bit + (block_group << (sb->s_blocksize_bits + 3)) -
(sizeof(struct spaceBitmapDesc) << 3);
if (!udf_clear_bit(bit, bh->b_data)) {
udf_debug("bit already cleared for block %d\n", bit);
goto repeat;
}
mark_buffer_dirty(bh);
udf_add_free_space(sb, partition, -1);
mutex_unlock(&sbi->s_alloc_mutex);
*err = 0;
return newblock;
error_return:
*err = -EIO;
mutex_unlock(&sbi->s_alloc_mutex);
return 0;
}
static void udf_table_free_blocks(struct super_block *sb,
struct inode *table,
struct kernel_lb_addr *bloc,
uint32_t offset,
uint32_t count)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct udf_part_map *partmap;
uint32_t start, end;
uint32_t elen;
struct kernel_lb_addr eloc;
struct extent_position oepos, epos;
int8_t etype;
int i;
struct udf_inode_info *iinfo;
mutex_lock(&sbi->s_alloc_mutex);
partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
if (bloc->logicalBlockNum + count < count ||
(bloc->logicalBlockNum + count) > partmap->s_partition_len) {
udf_debug("%d < %d || %d + %d > %d\n",
bloc->logicalBlockNum, 0,
bloc->logicalBlockNum, count,
partmap->s_partition_len);
goto error_return;
}
iinfo = UDF_I(table);
udf_add_free_space(sb, sbi->s_partition, count);
start = bloc->logicalBlockNum + offset;
end = bloc->logicalBlockNum + offset + count - 1;
epos.offset = oepos.offset = sizeof(struct unallocSpaceEntry);
elen = 0;
epos.block = oepos.block = iinfo->i_location;
epos.bh = oepos.bh = NULL;
while (count &&
(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
if (((eloc.logicalBlockNum +
(elen >> sb->s_blocksize_bits)) == start)) {
if ((0x3FFFFFFF - elen) <
(count << sb->s_blocksize_bits)) {
uint32_t tmp = ((0x3FFFFFFF - elen) >>
sb->s_blocksize_bits);
count -= tmp;
start += tmp;
elen = (etype << 30) |
(0x40000000 - sb->s_blocksize);
} else {
elen = (etype << 30) |
(elen +
(count << sb->s_blocksize_bits));
start += count;
count = 0;
}
udf_write_aext(table, &oepos, &eloc, elen, 1);
} else if (eloc.logicalBlockNum == (end + 1)) {
if ((0x3FFFFFFF - elen) <
(count << sb->s_blocksize_bits)) {
uint32_t tmp = ((0x3FFFFFFF - elen) >>
sb->s_blocksize_bits);
count -= tmp;
end -= tmp;
eloc.logicalBlockNum -= tmp;
elen = (etype << 30) |
(0x40000000 - sb->s_blocksize);
} else {
eloc.logicalBlockNum = start;
elen = (etype << 30) |
(elen +
(count << sb->s_blocksize_bits));
end -= count;
count = 0;
}
udf_write_aext(table, &oepos, &eloc, elen, 1);
}
if (epos.bh != oepos.bh) {
i = -1;
oepos.block = epos.block;
brelse(oepos.bh);
get_bh(epos.bh);
oepos.bh = epos.bh;
oepos.offset = 0;
} else {
oepos.offset = epos.offset;
}
}
if (count) {
/*
* NOTE: we CANNOT use udf_add_aext here, as it can try to
* allocate a new block, and since we hold the super block
* lock already very bad things would happen :)
*
* We copy the behavior of udf_add_aext, but instead of
* trying to allocate a new block close to the existing one,
* we just steal a block from the extent we are trying to add.
*
* It would be nice if the blocks were close together, but it
* isn't required.
*/
int adsize;
struct short_ad *sad = NULL;
struct long_ad *lad = NULL;
struct allocExtDesc *aed;
eloc.logicalBlockNum = start;
elen = EXT_RECORDED_ALLOCATED |
(count << sb->s_blocksize_bits);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
adsize = sizeof(struct short_ad);
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
adsize = sizeof(struct long_ad);
else {
brelse(oepos.bh);
brelse(epos.bh);
goto error_return;
}
if (epos.offset + (2 * adsize) > sb->s_blocksize) {
unsigned char *sptr, *dptr;
int loffset;
brelse(oepos.bh);
oepos = epos;
/* Steal a block from the extent being free'd */
epos.block.logicalBlockNum = eloc.logicalBlockNum;
eloc.logicalBlockNum++;
elen -= sb->s_blocksize;
epos.bh = udf_tread(sb,
udf_get_lb_pblock(sb, &epos.block, 0));
if (!epos.bh) {
brelse(oepos.bh);
goto error_return;
}
aed = (struct allocExtDesc *)(epos.bh->b_data);
aed->previousAllocExtLocation =
cpu_to_le32(oepos.block.logicalBlockNum);
if (epos.offset + adsize > sb->s_blocksize) {
loffset = epos.offset;
aed->lengthAllocDescs = cpu_to_le32(adsize);
sptr = iinfo->i_ext.i_data + epos.offset
- adsize;
dptr = epos.bh->b_data +
sizeof(struct allocExtDesc);
memcpy(dptr, sptr, adsize);
epos.offset = sizeof(struct allocExtDesc) +
adsize;
} else {
loffset = epos.offset + adsize;
aed->lengthAllocDescs = cpu_to_le32(0);
if (oepos.bh) {
sptr = oepos.bh->b_data + epos.offset;
aed = (struct allocExtDesc *)
oepos.bh->b_data;
le32_add_cpu(&aed->lengthAllocDescs,
adsize);
} else {
sptr = iinfo->i_ext.i_data +
epos.offset;
iinfo->i_lenAlloc += adsize;
mark_inode_dirty(table);
}
epos.offset = sizeof(struct allocExtDesc);
}
if (sbi->s_udfrev >= 0x0200)
udf_new_tag(epos.bh->b_data, TAG_IDENT_AED,
3, 1, epos.block.logicalBlockNum,
sizeof(struct tag));
else
udf_new_tag(epos.bh->b_data, TAG_IDENT_AED,
2, 1, epos.block.logicalBlockNum,
sizeof(struct tag));
switch (iinfo->i_alloc_type) {
case ICBTAG_FLAG_AD_SHORT:
sad = (struct short_ad *)sptr;
sad->extLength = cpu_to_le32(
EXT_NEXT_EXTENT_ALLOCDECS |
sb->s_blocksize);
sad->extPosition =
cpu_to_le32(epos.block.logicalBlockNum);
break;
case ICBTAG_FLAG_AD_LONG:
lad = (struct long_ad *)sptr;
lad->extLength = cpu_to_le32(
EXT_NEXT_EXTENT_ALLOCDECS |
sb->s_blocksize);
lad->extLocation =
cpu_to_lelb(epos.block);
break;
}
if (oepos.bh) {
udf_update_tag(oepos.bh->b_data, loffset);
mark_buffer_dirty(oepos.bh);
} else {
mark_inode_dirty(table);
}
}
/* It's possible that stealing the block emptied the extent */
if (elen) {
udf_write_aext(table, &epos, &eloc, elen, 1);
if (!epos.bh) {
iinfo->i_lenAlloc += adsize;
mark_inode_dirty(table);
} else {
aed = (struct allocExtDesc *)epos.bh->b_data;
le32_add_cpu(&aed->lengthAllocDescs, adsize);
udf_update_tag(epos.bh->b_data, epos.offset);
mark_buffer_dirty(epos.bh);
}
}
}
brelse(epos.bh);
brelse(oepos.bh);
error_return:
mutex_unlock(&sbi->s_alloc_mutex);
return;
}
static int udf_table_prealloc_blocks(struct super_block *sb,
struct inode *table, uint16_t partition,
uint32_t first_block, uint32_t block_count)
{
struct udf_sb_info *sbi = UDF_SB(sb);
int alloc_count = 0;
uint32_t elen, adsize;
struct kernel_lb_addr eloc;
struct extent_position epos;
int8_t etype = -1;
struct udf_inode_info *iinfo;
if (first_block >= sbi->s_partmaps[partition].s_partition_len)
return 0;
iinfo = UDF_I(table);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
adsize = sizeof(struct short_ad);
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
adsize = sizeof(struct long_ad);
else
return 0;
mutex_lock(&sbi->s_alloc_mutex);
epos.offset = sizeof(struct unallocSpaceEntry);
epos.block = iinfo->i_location;
epos.bh = NULL;
eloc.logicalBlockNum = 0xFFFFFFFF;
while (first_block != eloc.logicalBlockNum &&
(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
udf_debug("eloc=%d, elen=%d, first_block=%d\n",
eloc.logicalBlockNum, elen, first_block);
; /* empty loop body */
}
if (first_block == eloc.logicalBlockNum) {
epos.offset -= adsize;
alloc_count = (elen >> sb->s_blocksize_bits);
if (alloc_count > block_count) {
alloc_count = block_count;
eloc.logicalBlockNum += alloc_count;
elen -= (alloc_count << sb->s_blocksize_bits);
udf_write_aext(table, &epos, &eloc,
(etype << 30) | elen, 1);
} else
udf_delete_aext(table, epos, eloc,
(etype << 30) | elen);
} else {
alloc_count = 0;
}
brelse(epos.bh);
if (alloc_count)
udf_add_free_space(sb, partition, -alloc_count);
mutex_unlock(&sbi->s_alloc_mutex);
return alloc_count;
}
static int udf_table_new_block(struct super_block *sb,
struct inode *table, uint16_t partition,
uint32_t goal, int *err)
{
struct udf_sb_info *sbi = UDF_SB(sb);
uint32_t spread = 0xFFFFFFFF, nspread = 0xFFFFFFFF;
uint32_t newblock = 0, adsize;
uint32_t elen, goal_elen = 0;
struct kernel_lb_addr eloc, uninitialized_var(goal_eloc);
struct extent_position epos, goal_epos;
int8_t etype;
struct udf_inode_info *iinfo = UDF_I(table);
*err = -ENOSPC;
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
adsize = sizeof(struct short_ad);
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
adsize = sizeof(struct long_ad);
else
return newblock;
mutex_lock(&sbi->s_alloc_mutex);
if (goal >= sbi->s_partmaps[partition].s_partition_len)
goal = 0;
/* We search for the closest matching block to goal. If we find
a exact hit, we stop. Otherwise we keep going till we run out
of extents. We store the buffer_head, bloc, and extoffset
of the current closest match and use that when we are done.
*/
epos.offset = sizeof(struct unallocSpaceEntry);
epos.block = iinfo->i_location;
epos.bh = goal_epos.bh = NULL;
while (spread &&
(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
if (goal >= eloc.logicalBlockNum) {
if (goal < eloc.logicalBlockNum +
(elen >> sb->s_blocksize_bits))
nspread = 0;
else
nspread = goal - eloc.logicalBlockNum -
(elen >> sb->s_blocksize_bits);
} else {
nspread = eloc.logicalBlockNum - goal;
}
if (nspread < spread) {
spread = nspread;
if (goal_epos.bh != epos.bh) {
brelse(goal_epos.bh);
goal_epos.bh = epos.bh;
get_bh(goal_epos.bh);
}
goal_epos.block = epos.block;
goal_epos.offset = epos.offset - adsize;
goal_eloc = eloc;
goal_elen = (etype << 30) | elen;
}
}
brelse(epos.bh);
if (spread == 0xFFFFFFFF) {
brelse(goal_epos.bh);
mutex_unlock(&sbi->s_alloc_mutex);
return 0;
}
/* Only allocate blocks from the beginning of the extent.
That way, we only delete (empty) extents, never have to insert an
extent because of splitting */
/* This works, but very poorly.... */
newblock = goal_eloc.logicalBlockNum;
goal_eloc.logicalBlockNum++;
goal_elen -= sb->s_blocksize;
if (goal_elen)
udf_write_aext(table, &goal_epos, &goal_eloc, goal_elen, 1);
else
udf_delete_aext(table, goal_epos, goal_eloc, goal_elen);
brelse(goal_epos.bh);
udf_add_free_space(sb, partition, -1);
mutex_unlock(&sbi->s_alloc_mutex);
*err = 0;
return newblock;
}
void udf_free_blocks(struct super_block *sb, struct inode *inode,
struct kernel_lb_addr *bloc, uint32_t offset,
uint32_t count)
{
uint16_t partition = bloc->partitionReferenceNum;
struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
udf_bitmap_free_blocks(sb, map->s_uspace.s_bitmap,
bloc, offset, count);
} else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
udf_table_free_blocks(sb, map->s_uspace.s_table,
bloc, offset, count);
} else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
udf_bitmap_free_blocks(sb, map->s_fspace.s_bitmap,
bloc, offset, count);
} else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
udf_table_free_blocks(sb, map->s_fspace.s_table,
bloc, offset, count);
}
if (inode) {
inode_sub_bytes(inode,
((sector_t)count) << sb->s_blocksize_bits);
}
}
inline int udf_prealloc_blocks(struct super_block *sb,
struct inode *inode,
uint16_t partition, uint32_t first_block,
uint32_t block_count)
{
struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
sector_t allocated;
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
allocated = udf_bitmap_prealloc_blocks(sb,
map->s_uspace.s_bitmap,
partition, first_block,
block_count);
else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
allocated = udf_table_prealloc_blocks(sb,
map->s_uspace.s_table,
partition, first_block,
block_count);
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
allocated = udf_bitmap_prealloc_blocks(sb,
map->s_fspace.s_bitmap,
partition, first_block,
block_count);
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
allocated = udf_table_prealloc_blocks(sb,
map->s_fspace.s_table,
partition, first_block,
block_count);
else
return 0;
if (inode && allocated > 0)
inode_add_bytes(inode, allocated << sb->s_blocksize_bits);
return allocated;
}
inline int udf_new_block(struct super_block *sb,
struct inode *inode,
uint16_t partition, uint32_t goal, int *err)
{
struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
int block;
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
block = udf_bitmap_new_block(sb,
map->s_uspace.s_bitmap,
partition, goal, err);
else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
block = udf_table_new_block(sb,
map->s_uspace.s_table,
partition, goal, err);
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
block = udf_bitmap_new_block(sb,
map->s_fspace.s_bitmap,
partition, goal, err);
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
block = udf_table_new_block(sb,
map->s_fspace.s_table,
partition, goal, err);
else {
*err = -EIO;
return 0;
}
if (inode && block)
inode_add_bytes(inode, sb->s_blocksize);
return block;
}