955 lines
24 KiB
C
955 lines
24 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/quotaops.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_first_one_bit(addr, size) find_first_one_bit(addr, size)
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#define udf_find_next_one_bit(addr, size, offset) find_next_one_bit(addr, size, offset)
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#define leBPL_to_cpup(x) leNUM_to_cpup(BITS_PER_LONG, x)
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#define leNUM_to_cpup(x,y) xleNUM_to_cpup(x,y)
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#define xleNUM_to_cpup(x,y) (le ## x ## _to_cpup(y))
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#define uintBPL_t uint(BITS_PER_LONG)
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#define uint(x) xuint(x)
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#define xuint(x) __le ## x
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static inline int find_next_one_bit (void * addr, int size, int offset)
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{
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uintBPL_t * p = ((uintBPL_t *) addr) + (offset / BITS_PER_LONG);
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int result = offset & ~(BITS_PER_LONG-1);
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset &= (BITS_PER_LONG-1);
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if (offset)
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{
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tmp = leBPL_to_cpup(p++);
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tmp &= ~0UL << offset;
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if (size < BITS_PER_LONG)
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goto found_first;
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if (tmp)
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goto found_middle;
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size -= BITS_PER_LONG;
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result += BITS_PER_LONG;
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}
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while (size & ~(BITS_PER_LONG-1))
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{
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if ((tmp = leBPL_to_cpup(p++)))
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goto found_middle;
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result += BITS_PER_LONG;
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size -= BITS_PER_LONG;
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}
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if (!size)
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return result;
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tmp = leBPL_to_cpup(p);
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found_first:
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tmp &= ~0UL >> (BITS_PER_LONG-size);
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found_middle:
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return result + ffz(~tmp);
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}
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#define find_first_one_bit(addr, size)\
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find_next_one_bit((addr), (size), 0)
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static int read_block_bitmap(struct super_block * sb,
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struct udf_bitmap *bitmap, unsigned int block, 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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kernel_lb_addr loc;
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loc.logicalBlockNum = bitmap->s_extPosition;
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loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
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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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{
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retval = -EIO;
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}
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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, 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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{
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udf_debug("block_group (%d) > nr_groups (%d)\n", block_group, 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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{
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retval = read_block_bitmap(sb, bitmap, block_group, 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, 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_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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kernel_lb_addr bloc, uint32_t offset, 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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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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down(&sbi->s_alloc_sem);
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if (bloc.logicalBlockNum < 0 ||
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(bloc.logicalBlockNum + count) > UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum))
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{
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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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UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum));
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goto error_return;
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}
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block = bloc.logicalBlockNum + offset + (sizeof(struct spaceBitmapDesc) << 3);
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do_more:
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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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{
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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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{
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if (udf_set_bit(bit + i, bh->b_data))
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{
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udf_debug("bit %ld already set\n", bit + i);
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udf_debug("byte=%2x\n", ((char *)bh->b_data)[(bit + i) >> 3]);
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}
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else
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{
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if (inode)
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DQUOT_FREE_BLOCK(inode, 1);
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if (UDF_SB_LVIDBH(sb))
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{
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UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)] =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)])+1);
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}
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}
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}
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mark_buffer_dirty(bh);
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if (overflow)
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{
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block += count;
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count = overflow;
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goto do_more;
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}
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error_return:
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sb->s_dirt = 1;
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if (UDF_SB_LVIDBH(sb))
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mark_buffer_dirty(UDF_SB_LVIDBH(sb));
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up(&sbi->s_alloc_sem);
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return;
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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, 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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down(&sbi->s_alloc_sem);
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if (first_block < 0 || first_block >= UDF_SB_PARTLEN(sb, partition))
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goto out;
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if (first_block + block_count > UDF_SB_PARTLEN(sb, partition))
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block_count = UDF_SB_PARTLEN(sb, partition) - first_block;
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repeat:
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nr_groups = (UDF_SB_PARTLEN(sb, partition) +
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(sizeof(struct spaceBitmapDesc) << 3) + (sb->s_blocksize * 8) - 1) / (sb->s_blocksize * 8);
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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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{
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if (!udf_test_bit(bit, bh->b_data))
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goto out;
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else if (DQUOT_PREALLOC_BLOCK(inode, 1))
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goto out;
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else if (!udf_clear_bit(bit, bh->b_data))
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{
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udf_debug("bit already cleared for block %d\n", bit);
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DQUOT_FREE_BLOCK(inode, 1);
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goto out;
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}
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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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if (block_count > 0)
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goto repeat;
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out:
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if (UDF_SB_LVIDBH(sb))
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{
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UDF_SB_LVID(sb)->freeSpaceTable[partition] =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[partition])-alloc_count);
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mark_buffer_dirty(UDF_SB_LVIDBH(sb));
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}
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sb->s_dirt = 1;
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up(&sbi->s_alloc_sem);
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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, 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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down(&sbi->s_alloc_sem);
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repeat:
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if (goal < 0 || goal >= UDF_SB_PARTLEN(sb, partition))
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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, sb->s_blocksize - group_start);
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if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize)
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{
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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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{
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goto got_block;
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}
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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, 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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{
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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, sb->s_blocksize << 3, bit);
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if (newbit < sb->s_blocksize << 3)
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{
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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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{
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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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{
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ptr = memscan((char *)bh->b_data + group_start, 0xFF, sb->s_blocksize - group_start);
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if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize)
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{
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bit = (ptr - ((char *)bh->b_data)) << 3;
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break;
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}
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}
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else
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{
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bit = udf_find_next_one_bit((char *)bh->b_data, sb->s_blocksize << 3, 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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{
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up(&sbi->s_alloc_sem);
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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, group_start << 3);
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if (bit >= sb->s_blocksize << 3)
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{
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up(&sbi->s_alloc_sem);
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return 0;
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}
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search_back:
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for (i=0; i<7 && bit > (group_start << 3) && udf_test_bit(bit - 1, bh->b_data); i++, bit--);
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got_block:
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/*
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* Check quota for allocation of this block.
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*/
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if (inode && DQUOT_ALLOC_BLOCK(inode, 1))
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{
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up(&sbi->s_alloc_sem);
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*err = -EDQUOT;
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return 0;
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}
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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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{
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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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if (UDF_SB_LVIDBH(sb))
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{
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UDF_SB_LVID(sb)->freeSpaceTable[partition] =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[partition])-1);
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mark_buffer_dirty(UDF_SB_LVIDBH(sb));
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}
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sb->s_dirt = 1;
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up(&sbi->s_alloc_sem);
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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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up(&sbi->s_alloc_sem);
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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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kernel_lb_addr bloc, uint32_t offset, uint32_t count)
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{
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struct udf_sb_info *sbi = UDF_SB(sb);
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uint32_t start, end;
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uint32_t nextoffset, oextoffset, elen;
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kernel_lb_addr nbloc, obloc, eloc;
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struct buffer_head *obh, *nbh;
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int8_t etype;
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int i;
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down(&sbi->s_alloc_sem);
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if (bloc.logicalBlockNum < 0 ||
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(bloc.logicalBlockNum + count) > UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum))
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{
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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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UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum));
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goto error_return;
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}
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/* We do this up front - There are some error conditions that could occure,
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but.. oh well */
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if (inode)
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DQUOT_FREE_BLOCK(inode, count);
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if (UDF_SB_LVIDBH(sb))
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{
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UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)] =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)])+count);
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mark_buffer_dirty(UDF_SB_LVIDBH(sb));
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}
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start = bloc.logicalBlockNum + offset;
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end = bloc.logicalBlockNum + offset + count - 1;
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oextoffset = nextoffset = sizeof(struct unallocSpaceEntry);
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elen = 0;
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obloc = nbloc = UDF_I_LOCATION(table);
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obh = nbh = NULL;
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while (count && (etype =
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udf_next_aext(table, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) != -1)
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{
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if (((eloc.logicalBlockNum + (elen >> sb->s_blocksize_bits)) ==
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start))
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{
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if ((0x3FFFFFFF - elen) < (count << sb->s_blocksize_bits))
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{
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count -= ((0x3FFFFFFF - elen) >> sb->s_blocksize_bits);
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start += ((0x3FFFFFFF - elen) >> sb->s_blocksize_bits);
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elen = (etype << 30) | (0x40000000 - sb->s_blocksize);
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}
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else
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{
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elen = (etype << 30) |
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(elen + (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, obloc, &oextoffset, eloc, elen, obh, 1);
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}
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else if (eloc.logicalBlockNum == (end + 1))
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{
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if ((0x3FFFFFFF - elen) < (count << sb->s_blocksize_bits))
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|
{
|
|
count -= ((0x3FFFFFFF - elen) >> sb->s_blocksize_bits);
|
|
end -= ((0x3FFFFFFF - elen) >> sb->s_blocksize_bits);
|
|
eloc.logicalBlockNum -=
|
|
((0x3FFFFFFF - elen) >> sb->s_blocksize_bits);
|
|
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, obloc, &oextoffset, eloc, elen, obh, 1);
|
|
}
|
|
|
|
if (nbh != obh)
|
|
{
|
|
i = -1;
|
|
obloc = nbloc;
|
|
udf_release_data(obh);
|
|
atomic_inc(&nbh->b_count);
|
|
obh = nbh;
|
|
oextoffset = 0;
|
|
}
|
|
else
|
|
oextoffset = nextoffset;
|
|
}
|
|
|
|
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;
|
|
short_ad *sad = NULL;
|
|
long_ad *lad = NULL;
|
|
struct allocExtDesc *aed;
|
|
|
|
eloc.logicalBlockNum = start;
|
|
elen = EXT_RECORDED_ALLOCATED |
|
|
(count << sb->s_blocksize_bits);
|
|
|
|
if (UDF_I_ALLOCTYPE(table) == ICBTAG_FLAG_AD_SHORT)
|
|
adsize = sizeof(short_ad);
|
|
else if (UDF_I_ALLOCTYPE(table) == ICBTAG_FLAG_AD_LONG)
|
|
adsize = sizeof(long_ad);
|
|
else
|
|
{
|
|
udf_release_data(obh);
|
|
udf_release_data(nbh);
|
|
goto error_return;
|
|
}
|
|
|
|
if (nextoffset + (2 * adsize) > sb->s_blocksize)
|
|
{
|
|
char *sptr, *dptr;
|
|
int loffset;
|
|
|
|
udf_release_data(obh);
|
|
obh = nbh;
|
|
obloc = nbloc;
|
|
oextoffset = nextoffset;
|
|
|
|
/* Steal a block from the extent being free'd */
|
|
nbloc.logicalBlockNum = eloc.logicalBlockNum;
|
|
eloc.logicalBlockNum ++;
|
|
elen -= sb->s_blocksize;
|
|
|
|
if (!(nbh = udf_tread(sb,
|
|
udf_get_lb_pblock(sb, nbloc, 0))))
|
|
{
|
|
udf_release_data(obh);
|
|
goto error_return;
|
|
}
|
|
aed = (struct allocExtDesc *)(nbh->b_data);
|
|
aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
|
|
if (nextoffset + adsize > sb->s_blocksize)
|
|
{
|
|
loffset = nextoffset;
|
|
aed->lengthAllocDescs = cpu_to_le32(adsize);
|
|
if (obh)
|
|
sptr = UDF_I_DATA(inode) + nextoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode) - adsize;
|
|
else
|
|
sptr = obh->b_data + nextoffset - adsize;
|
|
dptr = nbh->b_data + sizeof(struct allocExtDesc);
|
|
memcpy(dptr, sptr, adsize);
|
|
nextoffset = sizeof(struct allocExtDesc) + adsize;
|
|
}
|
|
else
|
|
{
|
|
loffset = nextoffset + adsize;
|
|
aed->lengthAllocDescs = cpu_to_le32(0);
|
|
sptr = (obh)->b_data + nextoffset;
|
|
nextoffset = sizeof(struct allocExtDesc);
|
|
|
|
if (obh)
|
|
{
|
|
aed = (struct allocExtDesc *)(obh)->b_data;
|
|
aed->lengthAllocDescs =
|
|
cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
|
|
}
|
|
else
|
|
{
|
|
UDF_I_LENALLOC(table) += adsize;
|
|
mark_inode_dirty(table);
|
|
}
|
|
}
|
|
if (UDF_SB_UDFREV(sb) >= 0x0200)
|
|
udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
|
|
nbloc.logicalBlockNum, sizeof(tag));
|
|
else
|
|
udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
|
|
nbloc.logicalBlockNum, sizeof(tag));
|
|
switch (UDF_I_ALLOCTYPE(table))
|
|
{
|
|
case ICBTAG_FLAG_AD_SHORT:
|
|
{
|
|
sad = (short_ad *)sptr;
|
|
sad->extLength = cpu_to_le32(
|
|
EXT_NEXT_EXTENT_ALLOCDECS |
|
|
sb->s_blocksize);
|
|
sad->extPosition = cpu_to_le32(nbloc.logicalBlockNum);
|
|
break;
|
|
}
|
|
case ICBTAG_FLAG_AD_LONG:
|
|
{
|
|
lad = (long_ad *)sptr;
|
|
lad->extLength = cpu_to_le32(
|
|
EXT_NEXT_EXTENT_ALLOCDECS |
|
|
sb->s_blocksize);
|
|
lad->extLocation = cpu_to_lelb(nbloc);
|
|
break;
|
|
}
|
|
}
|
|
if (obh)
|
|
{
|
|
udf_update_tag(obh->b_data, loffset);
|
|
mark_buffer_dirty(obh);
|
|
}
|
|
else
|
|
mark_inode_dirty(table);
|
|
}
|
|
|
|
if (elen) /* It's possible that stealing the block emptied the extent */
|
|
{
|
|
udf_write_aext(table, nbloc, &nextoffset, eloc, elen, nbh, 1);
|
|
|
|
if (!nbh)
|
|
{
|
|
UDF_I_LENALLOC(table) += adsize;
|
|
mark_inode_dirty(table);
|
|
}
|
|
else
|
|
{
|
|
aed = (struct allocExtDesc *)nbh->b_data;
|
|
aed->lengthAllocDescs =
|
|
cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
|
|
udf_update_tag(nbh->b_data, nextoffset);
|
|
mark_buffer_dirty(nbh);
|
|
}
|
|
}
|
|
}
|
|
|
|
udf_release_data(nbh);
|
|
udf_release_data(obh);
|
|
|
|
error_return:
|
|
sb->s_dirt = 1;
|
|
up(&sbi->s_alloc_sem);
|
|
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 extoffset, elen, adsize;
|
|
kernel_lb_addr bloc, eloc;
|
|
struct buffer_head *bh;
|
|
int8_t etype = -1;
|
|
|
|
if (first_block < 0 || first_block >= UDF_SB_PARTLEN(sb, partition))
|
|
return 0;
|
|
|
|
if (UDF_I_ALLOCTYPE(table) == ICBTAG_FLAG_AD_SHORT)
|
|
adsize = sizeof(short_ad);
|
|
else if (UDF_I_ALLOCTYPE(table) == ICBTAG_FLAG_AD_LONG)
|
|
adsize = sizeof(long_ad);
|
|
else
|
|
return 0;
|
|
|
|
down(&sbi->s_alloc_sem);
|
|
extoffset = sizeof(struct unallocSpaceEntry);
|
|
bloc = UDF_I_LOCATION(table);
|
|
|
|
bh = NULL;
|
|
eloc.logicalBlockNum = 0xFFFFFFFF;
|
|
|
|
while (first_block != eloc.logicalBlockNum && (etype =
|
|
udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 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)
|
|
{
|
|
extoffset -= adsize;
|
|
|
|
alloc_count = (elen >> sb->s_blocksize_bits);
|
|
if (inode && DQUOT_PREALLOC_BLOCK(inode, alloc_count > block_count ? block_count : alloc_count))
|
|
alloc_count = 0;
|
|
else if (alloc_count > block_count)
|
|
{
|
|
alloc_count = block_count;
|
|
eloc.logicalBlockNum += alloc_count;
|
|
elen -= (alloc_count << sb->s_blocksize_bits);
|
|
udf_write_aext(table, bloc, &extoffset, eloc, (etype << 30) | elen, bh, 1);
|
|
}
|
|
else
|
|
udf_delete_aext(table, bloc, extoffset, eloc, (etype << 30) | elen, bh);
|
|
}
|
|
else
|
|
alloc_count = 0;
|
|
|
|
udf_release_data(bh);
|
|
|
|
if (alloc_count && UDF_SB_LVIDBH(sb))
|
|
{
|
|
UDF_SB_LVID(sb)->freeSpaceTable[partition] =
|
|
cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[partition])-alloc_count);
|
|
mark_buffer_dirty(UDF_SB_LVIDBH(sb));
|
|
sb->s_dirt = 1;
|
|
}
|
|
up(&sbi->s_alloc_sem);
|
|
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 extoffset, goal_extoffset, elen, goal_elen = 0;
|
|
kernel_lb_addr bloc, goal_bloc, eloc, goal_eloc;
|
|
struct buffer_head *bh, *goal_bh;
|
|
int8_t etype;
|
|
|
|
*err = -ENOSPC;
|
|
|
|
if (UDF_I_ALLOCTYPE(table) == ICBTAG_FLAG_AD_SHORT)
|
|
adsize = sizeof(short_ad);
|
|
else if (UDF_I_ALLOCTYPE(table) == ICBTAG_FLAG_AD_LONG)
|
|
adsize = sizeof(long_ad);
|
|
else
|
|
return newblock;
|
|
|
|
down(&sbi->s_alloc_sem);
|
|
if (goal < 0 || goal >= UDF_SB_PARTLEN(sb, partition))
|
|
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.
|
|
*/
|
|
|
|
extoffset = sizeof(struct unallocSpaceEntry);
|
|
bloc = UDF_I_LOCATION(table);
|
|
|
|
goal_bh = bh = NULL;
|
|
|
|
while (spread && (etype =
|
|
udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 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_bh != bh)
|
|
{
|
|
udf_release_data(goal_bh);
|
|
goal_bh = bh;
|
|
atomic_inc(&goal_bh->b_count);
|
|
}
|
|
goal_bloc = bloc;
|
|
goal_extoffset = extoffset - adsize;
|
|
goal_eloc = eloc;
|
|
goal_elen = (etype << 30) | elen;
|
|
}
|
|
}
|
|
|
|
udf_release_data(bh);
|
|
|
|
if (spread == 0xFFFFFFFF)
|
|
{
|
|
udf_release_data(goal_bh);
|
|
up(&sbi->s_alloc_sem);
|
|
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 (inode && DQUOT_ALLOC_BLOCK(inode, 1))
|
|
{
|
|
udf_release_data(goal_bh);
|
|
up(&sbi->s_alloc_sem);
|
|
*err = -EDQUOT;
|
|
return 0;
|
|
}
|
|
|
|
if (goal_elen)
|
|
udf_write_aext(table, goal_bloc, &goal_extoffset, goal_eloc, goal_elen, goal_bh, 1);
|
|
else
|
|
udf_delete_aext(table, goal_bloc, goal_extoffset, goal_eloc, goal_elen, goal_bh);
|
|
udf_release_data(goal_bh);
|
|
|
|
if (UDF_SB_LVIDBH(sb))
|
|
{
|
|
UDF_SB_LVID(sb)->freeSpaceTable[partition] =
|
|
cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[partition])-1);
|
|
mark_buffer_dirty(UDF_SB_LVIDBH(sb));
|
|
}
|
|
|
|
sb->s_dirt = 1;
|
|
up(&sbi->s_alloc_sem);
|
|
*err = 0;
|
|
return newblock;
|
|
}
|
|
|
|
inline void udf_free_blocks(struct super_block * sb,
|
|
struct inode * inode,
|
|
kernel_lb_addr bloc, uint32_t offset, uint32_t count)
|
|
{
|
|
uint16_t partition = bloc.partitionReferenceNum;
|
|
|
|
if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_UNALLOC_BITMAP)
|
|
{
|
|
return udf_bitmap_free_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_uspace.s_bitmap,
|
|
bloc, offset, count);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_UNALLOC_TABLE)
|
|
{
|
|
return udf_table_free_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_uspace.s_table,
|
|
bloc, offset, count);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_FREED_BITMAP)
|
|
{
|
|
return udf_bitmap_free_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_fspace.s_bitmap,
|
|
bloc, offset, count);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_FREED_TABLE)
|
|
{
|
|
return udf_table_free_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_fspace.s_table,
|
|
bloc, offset, count);
|
|
}
|
|
else
|
|
return;
|
|
}
|
|
|
|
inline int udf_prealloc_blocks(struct super_block * sb,
|
|
struct inode * inode,
|
|
uint16_t partition, uint32_t first_block, uint32_t block_count)
|
|
{
|
|
if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_UNALLOC_BITMAP)
|
|
{
|
|
return udf_bitmap_prealloc_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_uspace.s_bitmap,
|
|
partition, first_block, block_count);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_UNALLOC_TABLE)
|
|
{
|
|
return udf_table_prealloc_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_uspace.s_table,
|
|
partition, first_block, block_count);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_FREED_BITMAP)
|
|
{
|
|
return udf_bitmap_prealloc_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_fspace.s_bitmap,
|
|
partition, first_block, block_count);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_FREED_TABLE)
|
|
{
|
|
return udf_table_prealloc_blocks(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].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)
|
|
{
|
|
if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_UNALLOC_BITMAP)
|
|
{
|
|
return udf_bitmap_new_block(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_uspace.s_bitmap,
|
|
partition, goal, err);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_UNALLOC_TABLE)
|
|
{
|
|
return udf_table_new_block(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_uspace.s_table,
|
|
partition, goal, err);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_FREED_BITMAP)
|
|
{
|
|
return udf_bitmap_new_block(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_fspace.s_bitmap,
|
|
partition, goal, err);
|
|
}
|
|
else if (UDF_SB_PARTFLAGS(sb, partition) & UDF_PART_FLAG_FREED_TABLE)
|
|
{
|
|
return udf_table_new_block(sb, inode,
|
|
UDF_SB_PARTMAPS(sb)[partition].s_fspace.s_table,
|
|
partition, goal, err);
|
|
}
|
|
else
|
|
{
|
|
*err = -EIO;
|
|
return 0;
|
|
}
|
|
}
|