diff options
Diffstat (limited to 'fs/udf/balloc.c')
| -rw-r--r-- | fs/udf/balloc.c | 959 |
1 files changed, 959 insertions, 0 deletions
diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c new file mode 100644 index 0000000..b9ded26 --- /dev/null +++ b/fs/udf/balloc.c @@ -0,0 +1,959 @@ +/* + * balloc.c + * + * PURPOSE + * Block allocation handling routines for the OSTA-UDF(tm) filesystem. + * + * CONTACTS + * E-mail regarding any portion of the Linux UDF file system should be + * directed to the development team mailing list (run by majordomo): + * linux_udf@hpesjro.fc.hp.com + * + * COPYRIGHT + * This file is distributed under the terms of the GNU General Public + * License (GPL). Copies of the GPL can be obtained from: + * ftp://prep.ai.mit.edu/pub/gnu/GPL + * Each contributing author retains all rights to their own work. + * + * (C) 1999-2001 Ben Fennema + * (C) 1999 Stelias Computing Inc + * + * HISTORY + * + * 02/24/99 blf Created. + * + */ + +#include "udfdecl.h" + +#include <linux/quotaops.h> +#include <linux/buffer_head.h> +#include <linux/bitops.h> + +#include "udf_i.h" +#include "udf_sb.h" + +#define udf_clear_bit(nr,addr) ext2_clear_bit(nr,addr) +#define udf_set_bit(nr,addr) ext2_set_bit(nr,addr) +#define udf_test_bit(nr, addr) ext2_test_bit(nr, addr) +#define udf_find_first_one_bit(addr, size) find_first_one_bit(addr, size) +#define udf_find_next_one_bit(addr, size, offset) find_next_one_bit(addr, size, offset) + +#define leBPL_to_cpup(x) leNUM_to_cpup(BITS_PER_LONG, x) +#define leNUM_to_cpup(x,y) xleNUM_to_cpup(x,y) +#define xleNUM_to_cpup(x,y) (le ## x ## _to_cpup(y)) +#define uintBPL_t uint(BITS_PER_LONG) +#define uint(x) xuint(x) +#define xuint(x) __le ## x + +extern inline int find_next_one_bit (void * addr, int size, int offset) +{ + uintBPL_t * p = ((uintBPL_t *) addr) + (offset / BITS_PER_LONG); + int result = offset & ~(BITS_PER_LONG-1); + unsigned long tmp; + + if (offset >= size) + return size; + size -= result; + offset &= (BITS_PER_LONG-1); + if (offset) + { + tmp = leBPL_to_cpup(p++); + tmp &= ~0UL << offset; + if (size < BITS_PER_LONG) + goto found_first; + if (tmp) + goto found_middle; + size -= BITS_PER_LONG; + result += BITS_PER_LONG; + } + while (size & ~(BITS_PER_LONG-1)) + { + if ((tmp = leBPL_to_cpup(p++))) + goto found_middle; + result += BITS_PER_LONG; + size -= BITS_PER_LONG; + } + if (!size) + return result; + tmp = leBPL_to_cpup(p); +found_first: + tmp &= ~0UL >> (BITS_PER_LONG-size); +found_middle: + return result + ffz(~tmp); +} + +#define find_first_one_bit(addr, size)\ + find_next_one_bit((addr), (size), 0) + +static int read_block_bitmap(struct super_block * sb, + struct udf_bitmap *bitmap, unsigned int block, unsigned long bitmap_nr) +{ + struct buffer_head *bh = NULL; + int retval = 0; + kernel_lb_addr loc; + + loc.logicalBlockNum = bitmap->s_extPosition; + loc.partitionReferenceNum = UDF_SB_PARTITION(sb); + + bh = udf_tread(sb, udf_get_lb_pblock(sb, loc, block)); + if (!bh) + { + retval = -EIO; + } + bitmap->s_block_bitmap[bitmap_nr] = bh; + return retval; +} + +static int __load_block_bitmap(struct super_block * sb, + struct udf_bitmap *bitmap, unsigned int block_group) +{ + int retval = 0; + int nr_groups = bitmap->s_nr_groups; + + if (block_group >= nr_groups) + { + udf_debug("block_group (%d) > nr_groups (%d)\n", block_group, nr_groups); + } + + if (bitmap->s_block_bitmap[block_group]) + return block_group; + else + { + retval = read_block_bitmap(sb, bitmap, block_group, block_group); + if (retval < 0) + return retval; + return block_group; + } +} + +static inline int load_block_bitmap(struct super_block * sb, + struct udf_bitmap *bitmap, unsigned int block_group) +{ + int slot; + + slot = __load_block_bitmap(sb, bitmap, block_group); + + if (slot < 0) + return slot; + + if (!bitmap->s_block_bitmap[slot]) + return -EIO; + + return slot; +} + +static void udf_bitmap_free_blocks(struct super_block * sb, + struct inode * inode, + struct udf_bitmap *bitmap, + kernel_lb_addr bloc, uint32_t offset, uint32_t count) +{ + struct udf_sb_info *sbi = UDF_SB(sb); + struct buffer_head * bh = NULL; + unsigned long block; + unsigned long block_group; + unsigned long bit; + unsigned long i; + int bitmap_nr; + unsigned long overflow; + + down(&sbi->s_alloc_sem); + if (bloc.logicalBlockNum < 0 || + (bloc.logicalBlockNum + count) > UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum)) + { + udf_debug("%d < %d || %d + %d > %d\n", + bloc.logicalBlockNum, 0, bloc.logicalBlockNum, count, + UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum)); + goto error_return; + } + + block = bloc.logicalBlockNum + offset + (sizeof(struct spaceBitmapDesc) << 3); + +do_more: + overflow = 0; + block_group = block >> (sb->s_blocksize_bits + 3); + bit = block % (sb->s_blocksize << 3); + + /* + * Check to see if we are freeing blocks across a group boundary. + */ + if (bit + count > (sb->s_blocksize << 3)) + { + overflow = bit + count - (sb->s_blocksize << 3); + count -= overflow; + } + bitmap_nr = load_block_bitmap(sb, bitmap, block_group); + if (bitmap_nr < 0) + goto error_return; + + bh = bitmap->s_block_bitmap[bitmap_nr]; + for (i=0; i < count; i++) + { + if (udf_set_bit(bit + i, bh->b_data)) + { + udf_debug("bit %ld already set\n", bit + i); + udf_debug("byte=%2x\n", ((char *)bh->b_data)[(bit + i) >> 3]); + } + else + { + if (inode) + DQUOT_FREE_BLOCK(inode, 1); + if (UDF_SB_LVIDBH(sb)) + { + UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)] = + cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)])+1); + } + } + } + mark_buffer_dirty(bh); + if (overflow) + { + block += count; + count = overflow; + goto do_more; + } +error_return: + sb->s_dirt = 1; + if (UDF_SB_LVIDBH(sb)) + mark_buffer_dirty(UDF_SB_LVIDBH(sb)); + up(&sbi->s_alloc_sem); + return; +} + +static int udf_bitmap_prealloc_blocks(struct super_block * sb, + struct inode * inode, + struct udf_bitmap *bitmap, uint16_t partition, uint32_t first_block, + uint32_t block_count) +{ + struct udf_sb_info *sbi = UDF_SB(sb); + int alloc_count = 0; + int bit, block, block_group, group_start; + int nr_groups, bitmap_nr; + struct buffer_head *bh; + + down(&sbi->s_alloc_sem); + if (first_block < 0 || first_block >= UDF_SB_PARTLEN(sb, partition)) + goto out; + + if (first_block + block_count > UDF_SB_PARTLEN(sb, partition)) + block_count = UDF_SB_PARTLEN(sb, partition) - first_block; + +repeat: + nr_groups = (UDF_SB_PARTLEN(sb, partition) + + (sizeof(struct spaceBitmapDesc) << 3) + (sb->s_blocksize * 8) - 1) / (sb->s_blocksize * 8); + block = first_block + (sizeof(struct spaceBitmapDesc) << 3); + block_group = block >> (sb->s_blocksize_bits + 3); + group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc); + + bitmap_nr = load_block_bitmap(sb, bitmap, block_group); + if (bitmap_nr < 0) + goto out; + bh = bitmap->s_block_bitmap[bitmap_nr]; + + bit = block % (sb->s_blocksize << 3); + + while (bit < (sb->s_blocksize << 3) && block_count > 0) + { + if (!udf_test_bit(bit, bh->b_data)) + goto out; + else if (DQUOT_PREALLOC_BLOCK(inode, 1)) + goto out; + else if (!udf_clear_bit(bit, bh->b_data)) + { + udf_debug("bit already cleared for block %d\n", bit); + DQUOT_FREE_BLOCK(inode, 1); + goto out; + } + block_count --; + alloc_count ++; + bit ++; + block ++; + } + mark_buffer_dirty(bh); + if (block_count > 0) + goto repeat; +out: + if (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_bitmap_new_block(struct super_block * sb, + struct inode * inode, + struct udf_bitmap *bitmap, uint16_t partition, uint32_t goal, int *err) +{ + struct udf_sb_info *sbi = UDF_SB(sb); + int newbit, bit=0, block, block_group, group_start; + int end_goal, nr_groups, bitmap_nr, i; + struct buffer_head *bh = NULL; + char *ptr; + int newblock = 0; + + *err = -ENOSPC; + down(&sbi->s_alloc_sem); + +repeat: + if (goal < 0 || goal >= UDF_SB_PARTLEN(sb, partition)) + goal = 0; + + nr_groups = bitmap->s_nr_groups; + block = goal + (sizeof(struct spaceBitmapDesc) << 3); + block_group = block >> (sb->s_blocksize_bits + 3); + group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc); + + bitmap_nr = load_block_bitmap(sb, bitmap, block_group); + if (bitmap_nr < 0) + goto error_return; + bh = bitmap->s_block_bitmap[bitmap_nr]; + ptr = memscan((char *)bh->b_data + group_start, 0xFF, sb->s_blocksize - group_start); + + if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) + { + bit = block % (sb->s_blocksize << 3); + + if (udf_test_bit(bit, bh->b_data)) + { + goto got_block; + } + end_goal = (bit + 63) & ~63; + bit = udf_find_next_one_bit(bh->b_data, end_goal, bit); + if (bit < end_goal) + goto got_block; + ptr = memscan((char *)bh->b_data + (bit >> 3), 0xFF, sb->s_blocksize - ((bit + 7) >> 3)); + newbit = (ptr - ((char *)bh->b_data)) << 3; + if (newbit < sb->s_blocksize << 3) + { + bit = newbit; + goto search_back; + } + newbit = udf_find_next_one_bit(bh->b_data, sb->s_blocksize << 3, bit); + if (newbit < sb->s_blocksize << 3) + { + bit = newbit; + goto got_block; + } + } + + for (i=0; i<(nr_groups*2); i++) + { + block_group ++; + if (block_group >= nr_groups) + block_group = 0; + group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc); + + bitmap_nr = load_block_bitmap(sb, bitmap, block_group); + if (bitmap_nr < 0) + goto error_return; + bh = bitmap->s_block_bitmap[bitmap_nr]; + if (i < nr_groups) + { + ptr = memscan((char *)bh->b_data + group_start, 0xFF, sb->s_blocksize - group_start); + if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) + { + bit = (ptr - ((char *)bh->b_data)) << 3; + break; + } + } + else + { + bit = udf_find_next_one_bit((char *)bh->b_data, sb->s_blocksize << 3, group_start << 3); + if (bit < sb->s_blocksize << 3) + break; + } + } + if (i >= (nr_groups*2)) + { + up(&sbi->s_alloc_sem); + return newblock; + } + if (bit < sb->s_blocksize << 3) + goto search_back; + else + bit = udf_find_next_one_bit(bh->b_data, sb->s_blocksize << 3, group_start << 3); + if (bit >= sb->s_blocksize << 3) + { + up(&sbi->s_alloc_sem); + return 0; + } + +search_back: + for (i=0; i<7 && bit > (group_start << 3) && udf_test_bit(bit - 1, bh->b_data); i++, bit--); + +got_block: + + /* + * Check quota for allocation of this block. + */ + if (inode && DQUOT_ALLOC_BLOCK(inode, 1)) + { + up(&sbi->s_alloc_sem); + *err = -EDQUOT; + return 0; + } + + newblock = bit + (block_group << (sb->s_blocksize_bits + 3)) - + (sizeof(struct spaceBitmapDesc) << 3); + + if (!udf_clear_bit(bit, bh->b_data)) + { + udf_debug("bit already cleared for block %d\n", bit); + goto repeat; + } + + mark_buffer_dirty(bh); + + 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; + +error_return: + *err = -EIO; + up(&sbi->s_alloc_sem); + return 0; +} + +static void udf_table_free_blocks(struct super_block * sb, + struct inode * inode, + struct inode * table, + kernel_lb_addr bloc, uint32_t offset, uint32_t count) +{ + struct udf_sb_info *sbi = UDF_SB(sb); + uint32_t start, end; + uint32_t nextoffset, oextoffset, elen; + kernel_lb_addr nbloc, obloc, eloc; + struct buffer_head *obh, *nbh; + int8_t etype; + int i; + + down(&sbi->s_alloc_sem); + if (bloc.logicalBlockNum < 0 || + (bloc.logicalBlockNum + count) > UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum)) + { + udf_debug("%d < %d || %d + %d > %d\n", + bloc.logicalBlockNum, 0, bloc.logicalBlockNum, count, + UDF_SB_PARTLEN(sb, bloc.partitionReferenceNum)); + goto error_return; + } + + /* We do this up front - There are some error conditions that could occure, + but.. oh well */ + if (inode) + DQUOT_FREE_BLOCK(inode, count); + if (UDF_SB_LVIDBH(sb)) + { + UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)] = + cpu_to_le32(le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)])+count); + mark_buffer_dirty(UDF_SB_LVIDBH(sb)); + } + + start = bloc.logicalBlockNum + offset; + end = bloc.logicalBlockNum + offset + count - 1; + + oextoffset = nextoffset = sizeof(struct unallocSpaceEntry); + elen = 0; + obloc = nbloc = UDF_I_LOCATION(table); + + obh = nbh = NULL; + + while (count && (etype = + udf_next_aext(table, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) != -1) + { + if (((eloc.logicalBlockNum + (elen >> sb->s_blocksize_bits)) == + start)) + { + if ((0x3FFFFFFF - elen) < (count << sb->s_blocksize_bits)) + { + count -= ((0x3FFFFFFF - elen) >> sb->s_blocksize_bits); + start += ((0x3FFFFFFF - elen) >> sb->s_blocksize_bits); + elen = (etype << 30) | (0x40000000 - sb->s_blocksize); + } + else + { + elen = (etype << 30) | + (elen + (count << sb->s_blocksize_bits)); + start += count; + count = 0; + } + udf_write_aext(table, obloc, &oextoffset, eloc, elen, obh, 1); + } + else if (eloc.logicalBlockNum == (end + 1)) + { + if ((0x3FFFFFFF - elen) < (count << sb->s_blocksize_bits)) + { + 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; + } +} |
