udf: Convert UDF to new truncate calling sequence

Use new truncation sequence in UDF and fix up error handling in the
code.
Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/file.c

@@ -123,8 +123,8 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 		if (inode->i_sb->s_blocksize <
 				(udf_file_entry_alloc_offset(inode) +
 						pos + count)) {
-			udf_expand_file_adinicb(inode, pos + count, &err);
-			if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			err = udf_expand_file_adinicb(inode);
+			if (err) {
 				udf_debug("udf_expand_adinicb: err=%d\n", err);
 				up_write(&iinfo->i_data_sem);
 				return err;
@@ -237,7 +237,7 @@ static int udf_setattr(struct dentry *dentry, struct iattr *attr)
 
 	if ((attr->ia_valid & ATTR_SIZE) &&
 	    attr->ia_size != i_size_read(inode)) {
-		error = vmtruncate(inode, attr->ia_size);
+		error = udf_setsize(inode, attr->ia_size);
 		if (error)
 			return error;
 	}
@@ -249,5 +249,4 @@ static int udf_setattr(struct dentry *dentry, struct iattr *attr)
 
 const struct inode_operations udf_file_inode_operations = {
 	.setattr		= udf_setattr,
-	.truncate		= udf_truncate,
 };

fs/udf/truncate.c

@@ -197,6 +197,11 @@ static void udf_update_alloc_ext_desc(struct inode *inode,
 	mark_buffer_dirty_inode(epos->bh, inode);
 }
 
+/*
+ * Truncate extents of inode to inode->i_size. This function can be used only
+ * for making file shorter. For making file longer, udf_extend_file() has to
+ * be used.
+ */
 void udf_truncate_extents(struct inode *inode)
 {
 	struct extent_position epos;
@@ -219,7 +224,11 @@ void udf_truncate_extents(struct inode *inode)
 	etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 	byte_offset = (offset << sb->s_blocksize_bits) +
 		(inode->i_size & (sb->s_blocksize - 1));
-	if (etype != -1) {
+	if (etype == -1) {
+		/* We should extend the file? */
+		WARN_ON(byte_offset);
+		return;
+	}
 	epos.offset -= adsize;
 	extent_trunc(inode, &epos, &eloc, etype, elen, byte_offset);
 	epos.offset += adsize;
@@ -261,54 +270,19 @@ void udf_truncate_extents(struct inode *inode)
 			else
 				indirect_ext_len = 1;
 		} else {
-				extent_trunc(inode, &epos, &eloc, etype,
-					     elen, 0);
+			extent_trunc(inode, &epos, &eloc, etype, elen, 0);
 			epos.offset += adsize;
 		}
 	}
 
 	if (indirect_ext_len) {
 		BUG_ON(!epos.bh);
-			udf_free_blocks(sb, inode, &epos.block, 0,
-					indirect_ext_len);
+		udf_free_blocks(sb, inode, &epos.block, 0, indirect_ext_len);
 	} else if (!epos.bh) {
 		iinfo->i_lenAlloc = lenalloc;
 		mark_inode_dirty(inode);
 	} else
 		udf_update_alloc_ext_desc(inode, &epos, lenalloc);
-	} else if (inode->i_size) {
-		if (byte_offset) {
-			struct 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' 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 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,
-						      &extent.extLocation,
-						      &extent.extLength, 0);
-				extent.extLength |= etype << 30;
-			}
-			udf_extend_file(inode, &epos, &extent,
-					offset +
-					((inode->i_size &
-						(sb->s_blocksize - 1)) != 0));
-		}
-	}
 	iinfo->i_lenExtents = inode->i_size;
 
 	brelse(epos.bh);

fs/udf/udfdecl.h

@@ -136,21 +136,19 @@ extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,
 extern long udf_ioctl(struct file *, unsigned int, unsigned long);
 /* inode.c */
 extern struct inode *udf_iget(struct super_block *, struct kernel_lb_addr *);
-extern void udf_expand_file_adinicb(struct inode *, int, int *);
+extern int udf_expand_file_adinicb(struct inode *);
 extern struct buffer_head *udf_expand_dir_adinicb(struct inode *, int *, int *);
 extern struct buffer_head *udf_bread(struct inode *, int, int, int *);
-extern void udf_truncate(struct inode *);
+extern int udf_setsize(struct inode *, loff_t);
 extern void udf_read_inode(struct inode *);
 extern void udf_evict_inode(struct inode *);
 extern int udf_write_inode(struct inode *, struct writeback_control *wbc);
 extern long udf_block_map(struct inode *, sector_t);
-extern int udf_extend_file(struct inode *, struct extent_position *,
-			   struct kernel_long_ad *, sector_t);
 extern int8_t inode_bmap(struct inode *, sector_t, struct extent_position *,
 			 struct kernel_lb_addr *, uint32_t *, sector_t *);
-extern int8_t udf_add_aext(struct inode *, struct extent_position *,
+extern int udf_add_aext(struct inode *, struct extent_position *,
 			struct kernel_lb_addr *, uint32_t, int);
-extern int8_t udf_write_aext(struct inode *, struct extent_position *,
+extern void udf_write_aext(struct inode *, struct extent_position *,
 			   struct kernel_lb_addr *, uint32_t, int);
 extern int8_t udf_delete_aext(struct inode *, struct extent_position,
 			      struct kernel_lb_addr, uint32_t);