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![Jan Kara](/assets/img/avatar_default.png)
There's no need to call udf_add_free_space() for one block at a time. It saves us noticeable amount of work and yields different result from the original code only if the filesystem is corrupted and bitmap bit is already cleared. In such case counter of free blocks is probably wrong anyways so the change does not matter. Signed-off-by: Jan Kara <jack@suse.cz>
816 lines
22 KiB
C
816 lines
22 KiB
C
/*
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* balloc.c
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*
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* PURPOSE
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* Block allocation handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1999-2001 Ben Fennema
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* (C) 1999 Stelias Computing Inc
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*
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* HISTORY
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*
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* 02/24/99 blf Created.
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*
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*/
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#include "udfdecl.h"
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#include <linux/buffer_head.h>
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#include <linux/bitops.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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#define udf_clear_bit(nr, addr) ext2_clear_bit(nr, addr)
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#define udf_set_bit(nr, addr) ext2_set_bit(nr, addr)
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#define udf_test_bit(nr, addr) ext2_test_bit(nr, addr)
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#define udf_find_next_one_bit(addr, size, offset) \
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ext2_find_next_bit(addr, size, offset)
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static int read_block_bitmap(struct super_block *sb,
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struct udf_bitmap *bitmap, unsigned int block,
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unsigned long bitmap_nr)
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{
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struct buffer_head *bh = NULL;
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int retval = 0;
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struct kernel_lb_addr loc;
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loc.logicalBlockNum = bitmap->s_extPosition;
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loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
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bh = udf_tread(sb, udf_get_lb_pblock(sb, &loc, block));
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if (!bh)
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retval = -EIO;
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bitmap->s_block_bitmap[bitmap_nr] = bh;
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return retval;
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}
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static int __load_block_bitmap(struct super_block *sb,
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struct udf_bitmap *bitmap,
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unsigned int block_group)
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{
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int retval = 0;
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int nr_groups = bitmap->s_nr_groups;
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if (block_group >= nr_groups) {
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udf_debug("block_group (%d) > nr_groups (%d)\n", block_group,
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nr_groups);
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}
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if (bitmap->s_block_bitmap[block_group]) {
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return block_group;
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} else {
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retval = read_block_bitmap(sb, bitmap, block_group,
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block_group);
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if (retval < 0)
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return retval;
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return block_group;
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}
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}
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static inline int load_block_bitmap(struct super_block *sb,
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struct udf_bitmap *bitmap,
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unsigned int block_group)
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{
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int slot;
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slot = __load_block_bitmap(sb, bitmap, block_group);
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if (slot < 0)
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return slot;
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if (!bitmap->s_block_bitmap[slot])
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return -EIO;
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return slot;
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}
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static void udf_add_free_space(struct super_block *sb, u16 partition, u32 cnt)
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{
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct logicalVolIntegrityDesc *lvid;
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if (!sbi->s_lvid_bh)
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return;
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lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
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le32_add_cpu(&lvid->freeSpaceTable[partition], cnt);
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udf_updated_lvid(sb);
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}
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static void udf_bitmap_free_blocks(struct super_block *sb,
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struct inode *inode,
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struct udf_bitmap *bitmap,
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struct kernel_lb_addr *bloc,
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uint32_t offset,
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uint32_t count)
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{
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct buffer_head *bh = NULL;
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struct udf_part_map *partmap;
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unsigned long block;
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unsigned long block_group;
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unsigned long bit;
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unsigned long i;
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int bitmap_nr;
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unsigned long overflow;
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mutex_lock(&sbi->s_alloc_mutex);
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partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
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if (bloc->logicalBlockNum + count < count ||
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(bloc->logicalBlockNum + count) > partmap->s_partition_len) {
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udf_debug("%d < %d || %d + %d > %d\n",
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bloc->logicalBlockNum, 0, bloc->logicalBlockNum,
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count, partmap->s_partition_len);
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goto error_return;
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}
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block = bloc->logicalBlockNum + offset +
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(sizeof(struct spaceBitmapDesc) << 3);
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do {
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overflow = 0;
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block_group = block >> (sb->s_blocksize_bits + 3);
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bit = block % (sb->s_blocksize << 3);
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/*
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* Check to see if we are freeing blocks across a group boundary.
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*/
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if (bit + count > (sb->s_blocksize << 3)) {
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overflow = bit + count - (sb->s_blocksize << 3);
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count -= overflow;
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}
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bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
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if (bitmap_nr < 0)
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goto error_return;
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bh = bitmap->s_block_bitmap[bitmap_nr];
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for (i = 0; i < count; i++) {
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if (udf_set_bit(bit + i, bh->b_data)) {
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udf_debug("bit %ld already set\n", bit + i);
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udf_debug("byte=%2x\n",
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((char *)bh->b_data)[(bit + i) >> 3]);
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}
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}
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udf_add_free_space(sb, sbi->s_partition, count);
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mark_buffer_dirty(bh);
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if (overflow) {
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block += count;
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count = overflow;
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}
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} while (overflow);
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error_return:
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mutex_unlock(&sbi->s_alloc_mutex);
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}
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static int udf_bitmap_prealloc_blocks(struct super_block *sb,
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struct inode *inode,
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struct udf_bitmap *bitmap,
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uint16_t partition, uint32_t first_block,
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uint32_t block_count)
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{
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struct udf_sb_info *sbi = UDF_SB(sb);
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int alloc_count = 0;
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int bit, block, block_group, group_start;
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int nr_groups, bitmap_nr;
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struct buffer_head *bh;
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__u32 part_len;
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mutex_lock(&sbi->s_alloc_mutex);
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part_len = sbi->s_partmaps[partition].s_partition_len;
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if (first_block >= part_len)
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goto out;
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if (first_block + block_count > part_len)
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block_count = part_len - first_block;
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do {
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nr_groups = udf_compute_nr_groups(sb, partition);
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block = first_block + (sizeof(struct spaceBitmapDesc) << 3);
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block_group = block >> (sb->s_blocksize_bits + 3);
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group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc);
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bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
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if (bitmap_nr < 0)
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goto out;
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bh = bitmap->s_block_bitmap[bitmap_nr];
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bit = block % (sb->s_blocksize << 3);
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while (bit < (sb->s_blocksize << 3) && block_count > 0) {
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if (!udf_clear_bit(bit, bh->b_data))
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goto out;
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block_count--;
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alloc_count++;
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bit++;
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block++;
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}
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mark_buffer_dirty(bh);
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} while (block_count > 0);
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out:
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udf_add_free_space(sb, partition, -alloc_count);
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mutex_unlock(&sbi->s_alloc_mutex);
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return alloc_count;
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}
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static int udf_bitmap_new_block(struct super_block *sb,
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struct inode *inode,
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struct udf_bitmap *bitmap, uint16_t partition,
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uint32_t goal, int *err)
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{
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struct udf_sb_info *sbi = UDF_SB(sb);
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int newbit, bit = 0, block, block_group, group_start;
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int end_goal, nr_groups, bitmap_nr, i;
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struct buffer_head *bh = NULL;
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char *ptr;
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int newblock = 0;
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*err = -ENOSPC;
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mutex_lock(&sbi->s_alloc_mutex);
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repeat:
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if (goal >= sbi->s_partmaps[partition].s_partition_len)
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goal = 0;
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nr_groups = bitmap->s_nr_groups;
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block = goal + (sizeof(struct spaceBitmapDesc) << 3);
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block_group = block >> (sb->s_blocksize_bits + 3);
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group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc);
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bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
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if (bitmap_nr < 0)
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goto error_return;
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bh = bitmap->s_block_bitmap[bitmap_nr];
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ptr = memscan((char *)bh->b_data + group_start, 0xFF,
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sb->s_blocksize - group_start);
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if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) {
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bit = block % (sb->s_blocksize << 3);
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if (udf_test_bit(bit, bh->b_data))
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goto got_block;
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end_goal = (bit + 63) & ~63;
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bit = udf_find_next_one_bit(bh->b_data, end_goal, bit);
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if (bit < end_goal)
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goto got_block;
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ptr = memscan((char *)bh->b_data + (bit >> 3), 0xFF,
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sb->s_blocksize - ((bit + 7) >> 3));
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newbit = (ptr - ((char *)bh->b_data)) << 3;
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if (newbit < sb->s_blocksize << 3) {
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bit = newbit;
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goto search_back;
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}
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newbit = udf_find_next_one_bit(bh->b_data,
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sb->s_blocksize << 3, bit);
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if (newbit < sb->s_blocksize << 3) {
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bit = newbit;
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goto got_block;
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}
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}
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for (i = 0; i < (nr_groups * 2); i++) {
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block_group++;
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if (block_group >= nr_groups)
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block_group = 0;
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group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc);
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bitmap_nr = load_block_bitmap(sb, bitmap, block_group);
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if (bitmap_nr < 0)
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goto error_return;
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bh = bitmap->s_block_bitmap[bitmap_nr];
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if (i < nr_groups) {
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ptr = memscan((char *)bh->b_data + group_start, 0xFF,
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sb->s_blocksize - group_start);
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if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) {
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bit = (ptr - ((char *)bh->b_data)) << 3;
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break;
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}
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} else {
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bit = udf_find_next_one_bit((char *)bh->b_data,
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sb->s_blocksize << 3,
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group_start << 3);
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if (bit < sb->s_blocksize << 3)
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break;
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}
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}
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if (i >= (nr_groups * 2)) {
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mutex_unlock(&sbi->s_alloc_mutex);
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return newblock;
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}
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if (bit < sb->s_blocksize << 3)
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goto search_back;
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else
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bit = udf_find_next_one_bit(bh->b_data, sb->s_blocksize << 3,
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group_start << 3);
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if (bit >= sb->s_blocksize << 3) {
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mutex_unlock(&sbi->s_alloc_mutex);
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return 0;
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}
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search_back:
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i = 0;
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while (i < 7 && bit > (group_start << 3) &&
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udf_test_bit(bit - 1, bh->b_data)) {
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++i;
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--bit;
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}
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got_block:
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newblock = bit + (block_group << (sb->s_blocksize_bits + 3)) -
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(sizeof(struct spaceBitmapDesc) << 3);
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if (!udf_clear_bit(bit, bh->b_data)) {
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udf_debug("bit already cleared for block %d\n", bit);
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goto repeat;
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}
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mark_buffer_dirty(bh);
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udf_add_free_space(sb, partition, -1);
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mutex_unlock(&sbi->s_alloc_mutex);
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*err = 0;
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return newblock;
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error_return:
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*err = -EIO;
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mutex_unlock(&sbi->s_alloc_mutex);
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return 0;
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}
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static void udf_table_free_blocks(struct super_block *sb,
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struct inode *inode,
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struct inode *table,
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struct kernel_lb_addr *bloc,
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uint32_t offset,
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uint32_t count)
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{
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct udf_part_map *partmap;
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uint32_t start, end;
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uint32_t elen;
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struct kernel_lb_addr eloc;
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struct extent_position oepos, epos;
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int8_t etype;
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int i;
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struct udf_inode_info *iinfo;
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mutex_lock(&sbi->s_alloc_mutex);
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partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
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if (bloc->logicalBlockNum + count < count ||
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(bloc->logicalBlockNum + count) > partmap->s_partition_len) {
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udf_debug("%d < %d || %d + %d > %d\n",
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bloc->logicalBlockNum, 0, bloc->logicalBlockNum, count,
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partmap->s_partition_len);
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goto error_return;
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}
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iinfo = UDF_I(table);
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udf_add_free_space(sb, sbi->s_partition, count);
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start = bloc->logicalBlockNum + offset;
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end = bloc->logicalBlockNum + offset + count - 1;
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epos.offset = oepos.offset = sizeof(struct unallocSpaceEntry);
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elen = 0;
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epos.block = oepos.block = iinfo->i_location;
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epos.bh = oepos.bh = NULL;
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while (count &&
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(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
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if (((eloc.logicalBlockNum +
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(elen >> sb->s_blocksize_bits)) == start)) {
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if ((0x3FFFFFFF - elen) <
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(count << sb->s_blocksize_bits)) {
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uint32_t tmp = ((0x3FFFFFFF - elen) >>
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sb->s_blocksize_bits);
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count -= tmp;
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start += tmp;
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elen = (etype << 30) |
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(0x40000000 - sb->s_blocksize);
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} else {
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elen = (etype << 30) |
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(elen +
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(count << sb->s_blocksize_bits));
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start += count;
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count = 0;
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}
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udf_write_aext(table, &oepos, &eloc, elen, 1);
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} else if (eloc.logicalBlockNum == (end + 1)) {
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if ((0x3FFFFFFF - elen) <
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(count << sb->s_blocksize_bits)) {
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uint32_t tmp = ((0x3FFFFFFF - elen) >>
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sb->s_blocksize_bits);
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count -= tmp;
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end -= tmp;
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eloc.logicalBlockNum -= tmp;
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elen = (etype << 30) |
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(0x40000000 - sb->s_blocksize);
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} else {
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eloc.logicalBlockNum = start;
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elen = (etype << 30) |
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(elen +
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(count << sb->s_blocksize_bits));
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end -= count;
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count = 0;
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}
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udf_write_aext(table, &oepos, &eloc, elen, 1);
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}
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if (epos.bh != oepos.bh) {
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i = -1;
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oepos.block = epos.block;
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brelse(oepos.bh);
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get_bh(epos.bh);
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oepos.bh = epos.bh;
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oepos.offset = 0;
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} else {
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oepos.offset = epos.offset;
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}
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}
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if (count) {
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/*
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* NOTE: we CANNOT use udf_add_aext here, as it can try to
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* allocate a new block, and since we hold the super block
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* lock already very bad things would happen :)
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*
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* We copy the behavior of udf_add_aext, but instead of
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* trying to allocate a new block close to the existing one,
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* we just steal a block from the extent we are trying to add.
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*
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* It would be nice if the blocks were close together, but it
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* isn't required.
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*/
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int adsize;
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struct short_ad *sad = NULL;
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struct long_ad *lad = NULL;
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struct allocExtDesc *aed;
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eloc.logicalBlockNum = start;
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elen = EXT_RECORDED_ALLOCATED |
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(count << sb->s_blocksize_bits);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
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adsize = sizeof(struct short_ad);
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else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
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adsize = sizeof(struct long_ad);
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else {
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brelse(oepos.bh);
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brelse(epos.bh);
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goto error_return;
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}
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if (epos.offset + (2 * adsize) > sb->s_blocksize) {
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unsigned char *sptr, *dptr;
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int loffset;
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brelse(oepos.bh);
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oepos = epos;
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/* Steal a block from the extent being free'd */
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epos.block.logicalBlockNum = eloc.logicalBlockNum;
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eloc.logicalBlockNum++;
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elen -= sb->s_blocksize;
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epos.bh = udf_tread(sb,
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udf_get_lb_pblock(sb, &epos.block, 0));
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if (!epos.bh) {
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brelse(oepos.bh);
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goto error_return;
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}
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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 *inode,
|
|
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 *inode,
|
|
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, inode, map->s_uspace.s_bitmap,
|
|
bloc, offset, count);
|
|
} else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
|
|
udf_table_free_blocks(sb, inode, map->s_uspace.s_table,
|
|
bloc, offset, count);
|
|
} else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
|
|
udf_bitmap_free_blocks(sb, inode, map->s_fspace.s_bitmap,
|
|
bloc, offset, count);
|
|
} else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
|
|
udf_table_free_blocks(sb, inode, map->s_fspace.s_table,
|
|
bloc, offset, count);
|
|
}
|
|
}
|
|
|
|
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];
|
|
|
|
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
|
|
return udf_bitmap_prealloc_blocks(sb, inode,
|
|
map->s_uspace.s_bitmap,
|
|
partition, first_block,
|
|
block_count);
|
|
else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
|
|
return udf_table_prealloc_blocks(sb, inode,
|
|
map->s_uspace.s_table,
|
|
partition, first_block,
|
|
block_count);
|
|
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
|
|
return udf_bitmap_prealloc_blocks(sb, inode,
|
|
map->s_fspace.s_bitmap,
|
|
partition, first_block,
|
|
block_count);
|
|
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
|
|
return udf_table_prealloc_blocks(sb, inode,
|
|
map->s_fspace.s_table,
|
|
partition, first_block,
|
|
block_count);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
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];
|
|
|
|
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
|
|
return udf_bitmap_new_block(sb, inode,
|
|
map->s_uspace.s_bitmap,
|
|
partition, goal, err);
|
|
else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
|
|
return udf_table_new_block(sb, inode,
|
|
map->s_uspace.s_table,
|
|
partition, goal, err);
|
|
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
|
|
return udf_bitmap_new_block(sb, inode,
|
|
map->s_fspace.s_bitmap,
|
|
partition, goal, err);
|
|
else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
|
|
return udf_table_new_block(sb, inode,
|
|
map->s_fspace.s_table,
|
|
partition, goal, err);
|
|
else {
|
|
*err = -EIO;
|
|
return 0;
|
|
}
|
|
}
|