udf: support files larger than 1G
Make UDF work correctly for files larger than 1GB. As no extent can be
longer than (1<<30)-blocksize bytes, we have to create several extents if a
big hole is being created. As a side-effect, we now don't discard
preallocated blocks when creating a hole.
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>
diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
index 0e328cd..77975ae 100644
--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -130,7 +130,8 @@
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;
@@ -142,7 +143,7 @@
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;
@@ -169,7 +170,7 @@
* 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
{
@@ -182,7 +183,7 @@
{
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
@@ -193,11 +194,11 @@
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;
}
@@ -212,7 +213,7 @@
{
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
{
@@ -225,7 +226,7 @@
{
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
@@ -238,53 +239,28 @@
{
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;