udf: Factor out code for creating indirect extent
Factor out code for creating indirect extent from udf_add_aext(). It was
mostly duplicated in two places. Also remove some opencoded versions
of udf_write_aext().
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 566df9b..34c2d2b 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1866,112 +1866,102 @@
return inode;
}
-int udf_add_aext(struct inode *inode, struct extent_position *epos,
- struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+int udf_setup_indirect_aext(struct inode *inode, int block,
+ struct extent_position *epos)
{
- int adsize;
- struct short_ad *sad = NULL;
- struct long_ad *lad = NULL;
+ struct super_block *sb = inode->i_sb;
+ struct buffer_head *bh;
struct allocExtDesc *aed;
- uint8_t *ptr;
- struct udf_inode_info *iinfo = UDF_I(inode);
+ struct extent_position nepos;
+ struct kernel_lb_addr neloc;
+ int ver, adsize;
- if (!epos->bh)
- ptr = iinfo->i_ext.i_data + epos->offset -
- udf_file_entry_alloc_offset(inode) +
- iinfo->i_lenEAttr;
+ if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+
+ neloc.logicalBlockNum = block;
+ neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
+
+ bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
+ if (!bh)
+ return -EIO;
+ lock_buffer(bh);
+ memset(bh->b_data, 0x00, sb->s_blocksize);
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ mark_buffer_dirty_inode(bh, inode);
+
+ aed = (struct allocExtDesc *)(bh->b_data);
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
+ aed->previousAllocExtLocation =
+ cpu_to_le32(epos->block.logicalBlockNum);
+ }
+ aed->lengthAllocDescs = cpu_to_le32(0);
+ if (UDF_SB(sb)->s_udfrev >= 0x0200)
+ ver = 3;
else
- ptr = epos->bh->b_data + epos->offset;
+ ver = 2;
+ udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
+ sizeof(struct tag));
+
+ nepos.block = neloc;
+ nepos.offset = sizeof(struct allocExtDesc);
+ nepos.bh = bh;
+
+ /*
+ * Do we have to copy current last extent to make space for indirect
+ * one?
+ */
+ if (epos->offset + adsize > sb->s_blocksize) {
+ struct kernel_lb_addr cp_loc;
+ uint32_t cp_len;
+ int cp_type;
+
+ epos->offset -= adsize;
+ cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
+ cp_len |= ((uint32_t)cp_type) << 30;
+
+ __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
+ udf_write_aext(inode, epos, &nepos.block,
+ sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
+ } else {
+ __udf_add_aext(inode, epos, &nepos.block,
+ sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
+ }
+
+ brelse(epos->bh);
+ *epos = nepos;
+
+ return 0;
+}
+
+/*
+ * Append extent at the given position - should be the first free one in inode
+ * / indirect extent. This function assumes there is enough space in the inode
+ * or indirect extent. Use udf_add_aext() if you didn't check for this before.
+ */
+int __udf_add_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct allocExtDesc *aed;
+ int adsize;
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
adsize = sizeof(struct short_ad);
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
adsize = sizeof(struct long_ad);
- else
- return -EIO;
- if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
- unsigned char *sptr, *dptr;
- struct buffer_head *nbh;
- int err, loffset;
- struct kernel_lb_addr obloc = epos->block;
-
- epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
- obloc.partitionReferenceNum,
- obloc.logicalBlockNum, &err);
- if (!epos->block.logicalBlockNum)
- return -ENOSPC;
- nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
- &epos->block,
- 0));
- if (!nbh)
- return -EIO;
- lock_buffer(nbh);
- memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
- set_buffer_uptodate(nbh);
- unlock_buffer(nbh);
- mark_buffer_dirty_inode(nbh, inode);
-
- aed = (struct allocExtDesc *)(nbh->b_data);
- if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
- aed->previousAllocExtLocation =
- cpu_to_le32(obloc.logicalBlockNum);
- if (epos->offset + adsize > inode->i_sb->s_blocksize) {
- loffset = epos->offset;
- aed->lengthAllocDescs = cpu_to_le32(adsize);
- sptr = ptr - adsize;
- dptr = nbh->b_data + sizeof(struct allocExtDesc);
- memcpy(dptr, sptr, adsize);
- epos->offset = sizeof(struct allocExtDesc) + adsize;
- } else {
- loffset = epos->offset + adsize;
- aed->lengthAllocDescs = cpu_to_le32(0);
- sptr = ptr;
- epos->offset = sizeof(struct allocExtDesc);
-
- if (epos->bh) {
- aed = (struct allocExtDesc *)epos->bh->b_data;
- le32_add_cpu(&aed->lengthAllocDescs, adsize);
- } else {
- iinfo->i_lenAlloc += adsize;
- mark_inode_dirty(inode);
- }
- }
- if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
- udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
- epos->block.logicalBlockNum, sizeof(struct tag));
- else
- udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
- epos->block.logicalBlockNum, sizeof(struct tag));
- switch (iinfo->i_alloc_type) {
- case ICBTAG_FLAG_AD_SHORT:
- sad = (struct short_ad *)sptr;
- sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
- inode->i_sb->s_blocksize);
- sad->extPosition =
- cpu_to_le32(epos->block.logicalBlockNum);
- break;
- case ICBTAG_FLAG_AD_LONG:
- lad = (struct long_ad *)sptr;
- lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
- inode->i_sb->s_blocksize);
- lad->extLocation = cpu_to_lelb(epos->block);
- memset(lad->impUse, 0x00, sizeof(lad->impUse));
- break;
- }
- if (epos->bh) {
- if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
- UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
- udf_update_tag(epos->bh->b_data, loffset);
- else
- udf_update_tag(epos->bh->b_data,
- sizeof(struct allocExtDesc));
- mark_buffer_dirty_inode(epos->bh, inode);
- brelse(epos->bh);
- } else {
- mark_inode_dirty(inode);
- }
- epos->bh = nbh;
+ if (!epos->bh) {
+ WARN_ON(iinfo->i_lenAlloc !=
+ epos->offset - udf_file_entry_alloc_offset(inode));
+ } else {
+ aed = (struct allocExtDesc *)epos->bh->b_data;
+ WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
+ epos->offset - sizeof(struct allocExtDesc));
+ WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
}
udf_write_aext(inode, epos, eloc, elen, inc);
@@ -1995,6 +1985,41 @@
return 0;
}
+/*
+ * Append extent at given position - should be the first free one in inode
+ * / indirect extent. Takes care of allocating and linking indirect blocks.
+ */
+int udf_add_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+ int adsize;
+ struct super_block *sb = inode->i_sb;
+
+ if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ return -EIO;
+
+ if (epos->offset + (2 * adsize) > sb->s_blocksize) {
+ int err;
+ int new_block;
+
+ new_block = udf_new_block(sb, NULL,
+ epos->block.partitionReferenceNum,
+ epos->block.logicalBlockNum, &err);
+ if (!new_block)
+ return -ENOSPC;
+
+ err = udf_setup_indirect_aext(inode, new_block, epos);
+ if (err)
+ return err;
+ }
+
+ return __udf_add_aext(inode, epos, eloc, elen, inc);
+}
+
void udf_write_aext(struct inode *inode, struct extent_position *epos,
struct kernel_lb_addr *eloc, uint32_t elen, int inc)
{