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authorJan Kara <jack@suse.cz>2007-05-08 00:35:14 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:21 -0700
commitff116fc8d1d43927c7651b91d5aec41eb30c4429 (patch)
tree9b452298e6f070be35b2d366ce4a10e4a1384d17 /fs/udf/balloc.c
parent60448b1d6db4e82946ff9a2ac88df341f5fa87a2 (diff)
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UDF: introduce struct extent_position
Introduce a structure extent_position to store a position of an extent and the corresponding buffer_head in one place. Signed-off-by: Jan Kara <jack@suse.cz> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/udf/balloc.c')
-rw-r--r--fs/udf/balloc.c172
1 files changed, 83 insertions, 89 deletions
diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
index ea521f846d9..756dbbf0eaf 100644
--- a/fs/udf/balloc.c
+++ b/fs/udf/balloc.c
@@ -427,9 +427,9 @@ static void udf_table_free_blocks(struct super_block * sb,
{
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;
+ uint32_t elen;
+ kernel_lb_addr eloc;
+ struct extent_position oepos, epos;
int8_t etype;
int i;
@@ -457,14 +457,13 @@ static void udf_table_free_blocks(struct super_block * sb,
start = bloc.logicalBlockNum + offset;
end = bloc.logicalBlockNum + offset + count - 1;
- oextoffset = nextoffset = sizeof(struct unallocSpaceEntry);
+ epos.offset = oepos.offset = sizeof(struct unallocSpaceEntry);
elen = 0;
- obloc = nbloc = UDF_I_LOCATION(table);
-
- obh = nbh = NULL;
+ epos.block = oepos.block = UDF_I_LOCATION(table);
+ epos.bh = oepos.bh = NULL;
while (count && (etype =
- udf_next_aext(table, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) != -1)
+ udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
{
if (((eloc.logicalBlockNum + (elen >> sb->s_blocksize_bits)) ==
start))
@@ -482,7 +481,7 @@ static void udf_table_free_blocks(struct super_block * sb,
start += count;
count = 0;
}
- udf_write_aext(table, obloc, &oextoffset, eloc, elen, obh, 1);
+ udf_write_aext(table, &oepos, eloc, elen, 1);
}
else if (eloc.logicalBlockNum == (end + 1))
{
@@ -502,20 +501,20 @@ static void udf_table_free_blocks(struct super_block * sb,
end -= count;
count = 0;
}
- udf_write_aext(table, obloc, &oextoffset, eloc, elen, obh, 1);
+ udf_write_aext(table, &oepos, eloc, elen, 1);
}
- if (nbh != obh)
+ if (epos.bh != oepos.bh)
{
i = -1;
- obloc = nbloc;
- udf_release_data(obh);
- atomic_inc(&nbh->b_count);
- obh = nbh;
- oextoffset = 0;
+ oepos.block = epos.block;
+ udf_release_data(oepos.bh);
+ atomic_inc(&epos.bh->b_count);
+ oepos.bh = epos.bh;
+ oepos.offset = 0;
}
else
- oextoffset = nextoffset;
+ oepos.offset = epos.offset;
}
if (count)
@@ -547,55 +546,53 @@ static void udf_table_free_blocks(struct super_block * sb,
adsize = sizeof(long_ad);
else
{
- udf_release_data(obh);
- udf_release_data(nbh);
+ udf_release_data(oepos.bh);
+ udf_release_data(epos.bh);
goto error_return;
}
- if (nextoffset + (2 * adsize) > sb->s_blocksize)
+ if (epos.offset + (2 * adsize) > sb->s_blocksize)
{
char *sptr, *dptr;
int loffset;
- udf_release_data(obh);
- obh = nbh;
- obloc = nbloc;
- oextoffset = nextoffset;
+ udf_release_data(oepos.bh);
+ oepos = epos;
/* Steal a block from the extent being free'd */
- nbloc.logicalBlockNum = eloc.logicalBlockNum;
+ epos.block.logicalBlockNum = eloc.logicalBlockNum;
eloc.logicalBlockNum ++;
elen -= sb->s_blocksize;
- if (!(nbh = udf_tread(sb,
- udf_get_lb_pblock(sb, nbloc, 0))))
+ if (!(epos.bh = udf_tread(sb,
+ udf_get_lb_pblock(sb, epos.block, 0))))
{
- udf_release_data(obh);
+ udf_release_data(oepos.bh);
goto error_return;
}
- aed = (struct allocExtDesc *)(nbh->b_data);
- aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
- if (nextoffset + adsize > sb->s_blocksize)
+ aed = (struct allocExtDesc *)(epos.bh->b_data);
+ aed->previousAllocExtLocation = cpu_to_le32(oepos.block.logicalBlockNum);
+ if (epos.offset + adsize > sb->s_blocksize)
{
- loffset = nextoffset;
+ loffset = epos.offset;
aed->lengthAllocDescs = cpu_to_le32(adsize);
- sptr = UDF_I_DATA(inode) + nextoffset -
+ sptr = UDF_I_DATA(inode) + epos.offset -
udf_file_entry_alloc_offset(inode) +
UDF_I_LENEATTR(inode) - adsize;
- dptr = nbh->b_data + sizeof(struct allocExtDesc);
+ dptr = epos.bh->b_data + sizeof(struct allocExtDesc);
memcpy(dptr, sptr, adsize);
- nextoffset = sizeof(struct allocExtDesc) + adsize;
+ epos.offset = sizeof(struct allocExtDesc) + adsize;
}
else
{
- loffset = nextoffset + adsize;
+ loffset = epos.offset + adsize;
aed->lengthAllocDescs = cpu_to_le32(0);
- sptr = (obh)->b_data + nextoffset;
- nextoffset = sizeof(struct allocExtDesc);
+ sptr = oepos.bh->b_data + epos.offset;
+ epos.offset = sizeof(struct allocExtDesc);
- if (obh)
+ if (oepos.bh)
{
- aed = (struct allocExtDesc *)(obh)->b_data;
+ aed = (struct allocExtDesc *)oepos.bh->b_data;
aed->lengthAllocDescs =
cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
}
@@ -606,11 +603,11 @@ static void udf_table_free_blocks(struct super_block * sb,
}
}
if (UDF_SB_UDFREV(sb) >= 0x0200)
- udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
- nbloc.logicalBlockNum, sizeof(tag));
+ udf_new_tag(epos.bh->b_data, TAG_IDENT_AED, 3, 1,
+ epos.block.logicalBlockNum, sizeof(tag));
else
- udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
- nbloc.logicalBlockNum, sizeof(tag));
+ udf_new_tag(epos.bh->b_data, TAG_IDENT_AED, 2, 1,
+ epos.block.logicalBlockNum, sizeof(tag));
switch (UDF_I_ALLOCTYPE(table))
{
case ICBTAG_FLAG_AD_SHORT:
@@ -619,7 +616,7 @@ static void udf_table_free_blocks(struct super_block * sb,
sad->extLength = cpu_to_le32(
EXT_NEXT_EXTENT_ALLOCDECS |
sb->s_blocksize);
- sad->extPosition = cpu_to_le32(nbloc.logicalBlockNum);
+ sad->extPosition = cpu_to_le32(epos.block.logicalBlockNum);
break;
}
case ICBTAG_FLAG_AD_LONG:
@@ -628,14 +625,14 @@ static void udf_table_free_blocks(struct super_block * sb,
lad->extLength = cpu_to_le32(
EXT_NEXT_EXTENT_ALLOCDECS |
sb->s_blocksize);
- lad->extLocation = cpu_to_lelb(nbloc);
+ lad->extLocation = cpu_to_lelb(epos.block);
break;
}
}
- if (obh)
+ if (oepos.bh)
{
- udf_update_tag(obh->b_data, loffset);
- mark_buffer_dirty(obh);
+ udf_update_tag(oepos.bh->b_data, loffset);
+ mark_buffer_dirty(oepos.bh);
}
else
mark_inode_dirty(table);
@@ -643,26 +640,26 @@ static void udf_table_free_blocks(struct super_block * sb,
if (elen) /* It's possible that stealing the block emptied the extent */
{
- udf_write_aext(table, nbloc, &nextoffset, eloc, elen, nbh, 1);
+ udf_write_aext(table, &epos, eloc, elen, 1);
- if (!nbh)
+ if (!epos.bh)
{
UDF_I_LENALLOC(table) += adsize;
mark_inode_dirty(table);
}
else
{
- aed = (struct allocExtDesc *)nbh->b_data;
+ aed = (struct allocExtDesc *)epos.bh->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_update_tag(epos.bh->b_data, epos.offset);
+ mark_buffer_dirty(epos.bh);
}
}
}
- udf_release_data(nbh);
- udf_release_data(obh);
+ udf_release_data(epos.bh);
+ udf_release_data(oepos.bh);
error_return:
sb->s_dirt = 1;
@@ -677,9 +674,9 @@ static int udf_table_prealloc_blocks(struct super_block * sb,
{
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;
+ uint32_t elen, adsize;
+ kernel_lb_addr eloc;
+ struct extent_position epos;
int8_t etype = -1;
if (first_block < 0 || first_block >= UDF_SB_PARTLEN(sb, partition))
@@ -693,14 +690,13 @@ static int udf_table_prealloc_blocks(struct super_block * sb,
return 0;
mutex_lock(&sbi->s_alloc_mutex);
- extoffset = sizeof(struct unallocSpaceEntry);
- bloc = UDF_I_LOCATION(table);
-
- bh = NULL;
+ epos.offset = sizeof(struct unallocSpaceEntry);
+ epos.block = UDF_I_LOCATION(table);
+ epos.bh = NULL;
eloc.logicalBlockNum = 0xFFFFFFFF;
while (first_block != eloc.logicalBlockNum && (etype =
- udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
+ udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
{
udf_debug("eloc=%d, elen=%d, first_block=%d\n",
eloc.logicalBlockNum, elen, first_block);
@@ -709,7 +705,7 @@ static int udf_table_prealloc_blocks(struct super_block * sb,
if (first_block == eloc.logicalBlockNum)
{
- extoffset -= adsize;
+ epos.offset -= adsize;
alloc_count = (elen >> sb->s_blocksize_bits);
if (inode && DQUOT_PREALLOC_BLOCK(inode, alloc_count > block_count ? block_count : alloc_count))
@@ -719,15 +715,15 @@ static int udf_table_prealloc_blocks(struct super_block * sb,
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);
+ udf_write_aext(table, &epos, eloc, (etype << 30) | elen, 1);
}
else
- udf_delete_aext(table, bloc, extoffset, eloc, (etype << 30) | elen, bh);
+ udf_delete_aext(table, epos, eloc, (etype << 30) | elen);
}
else
alloc_count = 0;
- udf_release_data(bh);
+ udf_release_data(epos.bh);
if (alloc_count && UDF_SB_LVIDBH(sb))
{
@@ -747,9 +743,9 @@ static int udf_table_new_block(struct super_block * sb,
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;
+ uint32_t elen, goal_elen = 0;
+ kernel_lb_addr eloc, goal_eloc;
+ struct extent_position epos, goal_epos;
int8_t etype;
*err = -ENOSPC;
@@ -770,14 +766,12 @@ static int udf_table_new_block(struct super_block * sb,
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;
+ epos.offset = sizeof(struct unallocSpaceEntry);
+ epos.block = UDF_I_LOCATION(table);
+ epos.bh = goal_epos.bh = NULL;
while (spread && (etype =
- udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
+ udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
{
if (goal >= eloc.logicalBlockNum)
{
@@ -793,24 +787,24 @@ static int udf_table_new_block(struct super_block * sb,
if (nspread < spread)
{
spread = nspread;
- if (goal_bh != bh)
+ if (goal_epos.bh != epos.bh)
{
- udf_release_data(goal_bh);
- goal_bh = bh;
- atomic_inc(&goal_bh->b_count);
+ udf_release_data(goal_epos.bh);
+ goal_epos.bh = epos.bh;
+ atomic_inc(&goal_epos.bh->b_count);
}
- goal_bloc = bloc;
- goal_extoffset = extoffset - adsize;
+ goal_epos.block = epos.block;
+ goal_epos.offset = epos.offset - adsize;
goal_eloc = eloc;
goal_elen = (etype << 30) | elen;
}
}
- udf_release_data(bh);
+ udf_release_data(epos.bh);
if (spread == 0xFFFFFFFF)
{
- udf_release_data(goal_bh);
+ udf_release_data(goal_epos.bh);
mutex_unlock(&sbi->s_alloc_mutex);
return 0;
}
@@ -826,17 +820,17 @@ static int udf_table_new_block(struct super_block * sb,
if (inode && DQUOT_ALLOC_BLOCK(inode, 1))
{
- udf_release_data(goal_bh);
+ udf_release_data(goal_epos.bh);
mutex_unlock(&sbi->s_alloc_mutex);
*err = -EDQUOT;
return 0;
}
if (goal_elen)
- udf_write_aext(table, goal_bloc, &goal_extoffset, goal_eloc, goal_elen, goal_bh, 1);
+ udf_write_aext(table, &goal_epos, goal_eloc, goal_elen, 1);
else
- udf_delete_aext(table, goal_bloc, goal_extoffset, goal_eloc, goal_elen, goal_bh);
- udf_release_data(goal_bh);
+ udf_delete_aext(table, goal_epos, goal_eloc, goal_elen);
+ udf_release_data(goal_epos.bh);
if (UDF_SB_LVIDBH(sb))
{