return NULL;
}
+/* Extend the file by 'blocks' blocks, return the number of extents added */
+int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
+ kernel_long_ad *last_ext, sector_t blocks)
+{
+ sector_t add;
+ int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
+ struct super_block *sb = inode->i_sb;
+ kernel_lb_addr prealloc_loc = {0, 0};
+ int prealloc_len = 0;
+
+ /* The previous extent is fake and we should not extend by anything
+ * - there's nothing to do... */
+ if (!blocks && fake)
+ return 0;
+ /* Round the last extent up to a multiple of block size */
+ if (last_ext->extLength & (sb->s_blocksize - 1)) {
+ last_ext->extLength =
+ (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
+ (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
+ sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
+ UDF_I_LENEXTENTS(inode) =
+ (UDF_I_LENEXTENTS(inode) + sb->s_blocksize - 1) &
+ ~(sb->s_blocksize - 1);
+ }
+ /* Last extent are just preallocated blocks? */
+ if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_ALLOCATED) {
+ /* Save the extent so that we can reattach it to the end */
+ prealloc_loc = last_ext->extLocation;
+ prealloc_len = last_ext->extLength;
+ /* Mark the extent as a hole */
+ last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
+ last_ext->extLocation.logicalBlockNum = 0;
+ last_ext->extLocation.partitionReferenceNum = 0;
+ }
+ /* Can we merge with the previous extent? */
+ if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_NOT_ALLOCATED) {
+ add = ((1<<30) - sb->s_blocksize - (last_ext->extLength &
+ UDF_EXTENT_LENGTH_MASK)) >> sb->s_blocksize_bits;
+ if (add > blocks)
+ add = blocks;
+ blocks -= add;
+ last_ext->extLength += add << sb->s_blocksize_bits;
+ }
+
+ if (fake) {
+ udf_add_aext(inode, last_pos, last_ext->extLocation,
+ last_ext->extLength, 1);
+ count++;
+ }
+ else
+ udf_write_aext(inode, last_pos, last_ext->extLocation, last_ext->extLength, 1);
+ /* Managed to do everything necessary? */
+ if (!blocks)
+ goto out;
+
+ /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
+ last_ext->extLocation.logicalBlockNum = 0;
+ last_ext->extLocation.partitionReferenceNum = 0;
+ add = (1 << (30-sb->s_blocksize_bits)) - 1;
+ last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | (add << sb->s_blocksize_bits);
+ /* Create enough extents to cover the whole hole */
+ while (blocks > add) {
+ blocks -= add;
+ if (udf_add_aext(inode, last_pos, last_ext->extLocation,
+ last_ext->extLength, 1) == -1)
+ return -1;
+ count++;
+ }
+ if (blocks) {
+ last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ (blocks << sb->s_blocksize_bits);
+ if (udf_add_aext(inode, last_pos, last_ext->extLocation,
+ last_ext->extLength, 1) == -1)
+ return -1;
+ count++;
+ }
+out:
+ /* Do we have some preallocated blocks saved? */
+ if (prealloc_len) {
+ if (udf_add_aext(inode, last_pos, prealloc_loc, prealloc_len, 1) == -1)
+ return -1;
+ last_ext->extLocation = prealloc_loc;
+ last_ext->extLength = prealloc_len;
+ count++;
+ }
+ /* last_pos should point to the last written extent... */
+ if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
+ last_pos->offset -= sizeof(short_ad);
+ else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
+ last_pos->offset -= sizeof(long_ad);
+ else
+ return -1;
+ return count;
+}
+
static struct buffer_head * inode_getblk(struct inode * inode, sector_t block,
int *err, long *phys, int *new)
{
+ static sector_t last_block;
struct buffer_head *result = NULL;
kernel_long_ad laarr[EXTENT_MERGE_SIZE];
struct extent_position prev_epos, cur_epos, next_epos;
sector_t offset = 0;
int8_t etype;
int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
- char lastblock = 0;
+ int lastblock = 0;
prev_epos.offset = udf_file_entry_alloc_offset(inode);
prev_epos.block = UDF_I_LOCATION(inode);
b_off -= lbcount;
offset = b_off >> inode->i_sb->s_blocksize_bits;
+ /* Move into indirect extent if we are at a pointer to it */
+ udf_next_aext(inode, &prev_epos, &eloc, &elen, 0);
/* if the extent is allocated and recorded, return the block
if the extent is not a multiple of the blocksize, round up */
return NULL;
}
+ last_block = block;
+ /* Are we beyond EOF? */
if (etype == -1)
{
- endnum = startnum = ((count > 1) ? 1 : count);
- if (laarr[c].extLength & (inode->i_sb->s_blocksize - 1))
- {
- laarr[c].extLength =
- (laarr[c].extLength & UDF_EXTENT_FLAG_MASK) |
- (((laarr[c].extLength & UDF_EXTENT_LENGTH_MASK) +
- inode->i_sb->s_blocksize - 1) &
- ~(inode->i_sb->s_blocksize - 1));
- UDF_I_LENEXTENTS(inode) =
- (UDF_I_LENEXTENTS(inode) + inode->i_sb->s_blocksize - 1) &
- ~(inode->i_sb->s_blocksize - 1);
+ int ret;
+
+ if (count) {
+ if (c)
+ laarr[0] = laarr[1];
+ startnum = 1;
+ }
+ else {
+ /* Create a fake extent when there's not one */
+ memset(&laarr[0].extLocation, 0x00, sizeof(kernel_lb_addr));
+ laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+ /* Will udf_extend_file() create real extent from a fake one? */
+ startnum = (offset > 0);
+ }
+ /* Create extents for the hole between EOF and offset */
+ ret = udf_extend_file(inode, &prev_epos, laarr, offset);
+ if (ret == -1) {
+ brelse(prev_epos.bh);
+ brelse(cur_epos.bh);
+ brelse(next_epos.bh);
+ /* We don't really know the error here so we just make
+ * something up */
+ *err = -ENOSPC;
+ return NULL;
}
- c = !c;
- laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
- ((offset + 1) << inode->i_sb->s_blocksize_bits);
- memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
- count ++;
- endnum ++;
+ c = 0;
+ offset = 0;
+ count += ret;
+ /* We are not covered by a preallocated extent? */
+ if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) != EXT_NOT_RECORDED_ALLOCATED) {
+ /* Is there any real extent? - otherwise we overwrite
+ * the fake one... */
+ if (count)
+ c = !c;
+ laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ inode->i_sb->s_blocksize;
+ memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
+ count ++;
+ endnum ++;
+ }
+ endnum = c+1;
lastblock = 1;
}
- else
+ else {
endnum = startnum = ((count > 2) ? 2 : count);
- /* if the current extent is in position 0, swap it with the previous */
- if (!c && count != 1)
- {
- laarr[2] = laarr[0];
- laarr[0] = laarr[1];
- laarr[1] = laarr[2];
- c = 1;
- }
+ /* if the current extent is in position 0, swap it with the previous */
+ if (!c && count != 1)
+ {
+ laarr[2] = laarr[0];
+ laarr[0] = laarr[1];
+ laarr[1] = laarr[2];
+ c = 1;
+ }
- /* if the current block is located in a extent, read the next extent */
- if (etype != -1)
- {
+ /* if the current block is located in an extent, read the next extent */
if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0)) != -1)
{
laarr[c+1].extLength = (etype << 30) | elen;
startnum ++;
endnum ++;
}
- else
+ else {
lastblock = 1;
+ }
}
- brelse(cur_epos.bh);
- brelse(next_epos.bh);
/* if the current extent is not recorded but allocated, get the
block in the extent corresponding to the requested block */
udf_merge_extents(inode, laarr, &endnum);
/* write back the new extents, inserting new extents if the new number
- of extents is greater than the old number, and deleting extents if
- the new number of extents is less than the old number */
+ of extents is greater than the old number, and deleting extents if
+ the new number of extents is less than the old number */
udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
brelse(prev_epos.bh);
return;
}
udf_fill_inode(inode, bh);
+
brelse(bh);
}
kernel_lb_addr eloc, neloc = { 0, 0 };
uint32_t elen, nelen = 0, indirect_ext_len = 0, lenalloc;
int8_t etype;
- sector_t first_block = inode->i_size >> inode->i_sb->s_blocksize_bits, offset;
+ struct super_block *sb = inode->i_sb;
+ sector_t first_block = inode->i_size >> sb->s_blocksize_bits, offset;
loff_t byte_offset;
int adsize;
BUG();
etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
- byte_offset = (offset << inode->i_sb->s_blocksize_bits) + (inode->i_size & (inode->i_sb->s_blocksize-1));
+ byte_offset = (offset << sb->s_blocksize_bits) + (inode->i_size & (sb->s_blocksize-1));
if (etype != -1)
{
epos.offset -= adsize;
* indirect extent - free it too */
if (!epos.bh)
BUG();
- udf_free_blocks(inode->i_sb, inode, epos.block, 0, indirect_ext_len);
+ udf_free_blocks(sb, inode, epos.block, 0, indirect_ext_len);
}
else
{
{
struct allocExtDesc *aed = (struct allocExtDesc *)(epos.bh->b_data);
aed->lengthAllocDescs = cpu_to_le32(lenalloc);
- if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(sb) >= 0x0201)
udf_update_tag(epos.bh->b_data, lenalloc +
sizeof(struct allocExtDesc));
else
brelse(epos.bh);
epos.offset = sizeof(struct allocExtDesc);
epos.block = eloc;
- epos.bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, eloc, 0));
+ epos.bh = udf_tread(sb, udf_get_lb_pblock(sb, eloc, 0));
if (elen)
indirect_ext_len = (elen +
- inode->i_sb->s_blocksize - 1) >>
- inode->i_sb->s_blocksize_bits;
+ sb->s_blocksize - 1) >>
+ sb->s_blocksize_bits;
else
indirect_ext_len = 1;
}
{
if (!epos.bh)
BUG();
- udf_free_blocks(inode->i_sb, inode, epos.block, 0, indirect_ext_len);
+ udf_free_blocks(sb, inode, epos.block, 0, indirect_ext_len);
}
else
{
{
struct allocExtDesc *aed = (struct allocExtDesc *)(epos.bh->b_data);
aed->lengthAllocDescs = cpu_to_le32(lenalloc);
- if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(sb) >= 0x0201)
udf_update_tag(epos.bh->b_data, lenalloc +
sizeof(struct allocExtDesc));
else
{
if (byte_offset)
{
+ kernel_long_ad extent;
+
/*
* OK, there is not extent covering inode->i_size and
* no extent above inode->i_size => truncate is
- * extending the file by 'offset'.
+ * extending the file by 'offset' blocks.
*/
if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
(epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
- /* File has no extents at all! */
- memset(&eloc, 0x00, sizeof(kernel_lb_addr));
- elen = EXT_NOT_RECORDED_NOT_ALLOCATED | byte_offset;
- udf_add_aext(inode, &epos, eloc, elen, 1);
+ /* File has no extents at all or has empty last
+ * indirect extent! Create a fake extent... */
+ extent.extLocation.logicalBlockNum = 0;
+ extent.extLocation.partitionReferenceNum = 0;
+ extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
}
else {
epos.offset -= adsize;
- etype = udf_next_aext(inode, &epos, &eloc, &elen, 1);
-
- if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
- {
- epos.offset -= adsize;
- elen = EXT_NOT_RECORDED_NOT_ALLOCATED | (elen + byte_offset);
- udf_write_aext(inode, &epos, eloc, elen, 0);
- }
- else if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
- {
- kernel_lb_addr neloc = { 0, 0 };
- epos.offset -= adsize;
- nelen = EXT_NOT_RECORDED_NOT_ALLOCATED |
- ((elen + byte_offset + inode->i_sb->s_blocksize - 1) &
- ~(inode->i_sb->s_blocksize - 1));
- udf_write_aext(inode, &epos, neloc, nelen, 1);
- udf_add_aext(inode, &epos, eloc, (etype << 30) | elen, 1);
- }
- else
- {
- if (elen & (inode->i_sb->s_blocksize - 1))
- {
- epos.offset -= adsize;
- elen = EXT_RECORDED_ALLOCATED |
- ((elen + inode->i_sb->s_blocksize - 1) &
- ~(inode->i_sb->s_blocksize - 1));
- udf_write_aext(inode, &epos, eloc, elen, 1);
- }
- memset(&eloc, 0x00, sizeof(kernel_lb_addr));
- elen = EXT_NOT_RECORDED_NOT_ALLOCATED | byte_offset;
- udf_add_aext(inode, &epos, eloc, elen, 1);
- }
+ etype = udf_next_aext(inode, &epos,
+ &extent.extLocation, &extent.extLength, 0);
+ extent.extLength |= etype << 30;
}
+ udf_extend_file(inode, &epos, &extent, offset+((inode->i_size & (sb->s_blocksize-1)) != 0));
}
}
UDF_I_LENEXTENTS(inode) = inode->i_size;
projects / linux-2.6 / commitdiff