patch-2.3.49 linux/fs/udf/truncate.c

• Lines: 196
• Date: Thu Mar 2 11:17:32 2000
• Orig file: v2.3.48/linux/fs/udf/truncate.c
• Orig date: Thu Feb 10 17:11:19 2000

diff -u --recursive --new-file v2.3.48/linux/fs/udf/truncate.c linux/fs/udf/truncate.c
@@ -32,27 +32,34 @@
 #include "udf_i.h"
 #include "udf_sb.h"
 
-static void extent_trunc(struct inode * inode, lb_addr bloc, int *extoffset,
-	lb_addr eloc, Uint8 etype, Uint32 elen, struct buffer_head **bh, Uint32 offset)
+static void extent_trunc(struct inode * inode, lb_addr bloc, int extoffset,
+	lb_addr eloc, Uint8 etype, Uint32 elen, struct buffer_head **bh, Uint32 nelen)
 {
 	lb_addr neloc = { 0, 0 };
-	int nelen = 0; 
 	int blocks = inode->i_sb->s_blocksize / 512;
 	int last_block = (elen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
+	int first_block = (nelen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 
-	if (offset)
+	if (nelen)
 	{
-		nelen = (etype << 30) |
-			(((offset - 1) << inode->i_sb->s_blocksize_bits) +
-			(inode->i_size & (inode->i_sb->s_blocksize - 1)));
 		neloc = eloc;
+		nelen = (etype << 30) | nelen;
+	}
+
+	if (elen != nelen)
+	{
+		udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0);
+		if (last_block - first_block > 0)
+		{
+			if (etype == EXTENT_RECORDED_ALLOCATED)
+			{
+				inode->i_blocks -= (blocks * (last_block - first_block));
+				mark_inode_dirty(inode);
+			}
+			if (etype != EXTENT_NOT_RECORDED_NOT_ALLOCATED)
+				udf_free_blocks(inode, eloc, first_block, last_block - first_block);
+		}
 	}
-	if (etype == EXTENT_RECORDED_ALLOCATED)
-		inode->i_blocks -= (blocks * (last_block - offset));
-	udf_write_aext(inode, bloc, extoffset, neloc, nelen, bh, 1);
-	mark_inode_dirty(inode);
-	if (etype != EXTENT_NOT_RECORDED_NOT_ALLOCATED)
-		udf_free_blocks(inode, eloc, offset, last_block - offset);
 }
 
 void udf_trunc(struct inode * inode)
@@ -60,7 +67,7 @@
 	lb_addr bloc, eloc, neloc = { 0, 0 };
 	Uint32 extoffset, elen, offset, nelen = 0, lelen = 0, lenalloc;
 	int etype;
-	int first_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
+	int first_block = inode->i_size >> inode->i_sb->s_blocksize_bits;
 	struct buffer_head *bh = NULL;
 	int adsize;
 
@@ -71,10 +78,14 @@
 	else
 		adsize = 0;
 
-	if ((etype = inode_bmap(inode, first_block, &bloc, &extoffset, &eloc, &elen, &offset, &bh)) != -1)
+	etype = inode_bmap(inode, first_block, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
+	offset = (offset << inode->i_sb->s_blocksize_bits) |
+		(inode->i_size & (inode->i_sb->s_blocksize - 1));
+	if (etype != -1)
 	{
 		extoffset -= adsize;
-		extent_trunc(inode, bloc, &extoffset, eloc, etype, elen, &bh, offset);
+		extent_trunc(inode, bloc, extoffset, eloc, etype, elen, &bh, offset);
+		extoffset += adsize;
 
 		if (offset)
 			lenalloc = extoffset;
@@ -103,11 +114,17 @@
 				else
 				{
 					if (!memcmp(&UDF_I_LOCATION(inode), &bloc, sizeof(lb_addr)))
+					{
 						UDF_I_LENALLOC(inode) = lenalloc;
+						mark_inode_dirty(inode);
+					}
 					else
 					{
 						struct AllocExtDesc *aed = (struct AllocExtDesc *)(bh->b_data);
 						aed->lengthAllocDescs = cpu_to_le32(lenalloc);
+						udf_update_tag(bh->b_data, lenalloc +
+							sizeof(struct AllocExtDesc));
+						mark_buffer_dirty(bh, 1);
 					}
 				}
 
@@ -122,7 +139,10 @@
 					lelen = 1;
 			}
 			else
-				extent_trunc(inode, bloc, &extoffset, eloc, etype, elen, &bh, 0);
+			{
+				extent_trunc(inode, bloc, extoffset, eloc, etype, elen, &bh, 0);
+				extoffset += adsize;
+			}
 		}
 
 		if (lelen)
@@ -136,29 +156,42 @@
 		else
 		{
 			if (!memcmp(&UDF_I_LOCATION(inode), &bloc, sizeof(lb_addr)))
+			{
 				UDF_I_LENALLOC(inode) = lenalloc;
+				mark_inode_dirty(inode);
+			}
 			else
 			{
 				struct AllocExtDesc *aed = (struct AllocExtDesc *)(bh->b_data);
 				aed->lengthAllocDescs = cpu_to_le32(lenalloc);
+				udf_update_tag(bh->b_data, lenalloc +
+					sizeof(struct AllocExtDesc));
+				mark_buffer_dirty(bh, 1);
 			}
 		}
 	}
 	else if (inode->i_size)
 	{
-		char tetype;
-
 		if (offset)
 		{
 			extoffset -= adsize;
-			tetype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1);
-			if (tetype == EXTENT_NOT_RECORDED_NOT_ALLOCATED)
+			etype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1);
+			if (etype == EXTENT_NOT_RECORDED_NOT_ALLOCATED)
 			{
 				extoffset -= adsize;
-				elen = (EXTENT_NOT_RECORDED_NOT_ALLOCATED << 30) |
-					(elen + (offset << inode->i_sb->s_blocksize_bits));
+				elen = (EXTENT_NOT_RECORDED_NOT_ALLOCATED << 30) | (elen + offset);
 				udf_write_aext(inode, bloc, &extoffset, eloc, elen, &bh, 0);
 			}
+			else if (etype == EXTENT_NOT_RECORDED_ALLOCATED)
+			{
+				lb_addr neloc = { 0, 0 };
+				extoffset -= adsize;
+				nelen = (EXTENT_NOT_RECORDED_NOT_ALLOCATED << 30) |
+					((elen + offset + inode->i_sb->s_blocksize - 1) &
+					~(inode->i_sb->s_blocksize - 1));
+				udf_write_aext(inode, bloc, &extoffset, neloc, nelen, &bh, 1);
+				udf_add_aext(inode, &bloc, &extoffset, eloc, (etype << 30) | elen, &bh, 1);
+			}
 			else
 			{
 				if (elen & (inode->i_sb->s_blocksize - 1))
@@ -170,8 +203,7 @@
 					udf_write_aext(inode, bloc, &extoffset, eloc, elen, &bh, 1);
 				}
 				memset(&eloc, 0x00, sizeof(lb_addr));
-				elen = (EXTENT_NOT_RECORDED_NOT_ALLOCATED << 30) |
-					(offset << inode->i_sb->s_blocksize_bits);
+				elen = (EXTENT_NOT_RECORDED_NOT_ALLOCATED << 30) | offset;
 				udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 1);
 			}
 		}
@@ -182,6 +214,8 @@
 
 void udf_truncate(struct inode * inode)
 {
+	int err;
+
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 			S_ISLNK(inode->i_mode)))
 		return;
@@ -189,7 +223,22 @@
 		return;
 
 	if (UDF_I_ALLOCTYPE(inode) == ICB_FLAG_AD_IN_ICB)
-		UDF_I_LENALLOC(inode) = inode->i_size;
+	{
+		if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
+			inode->i_size))
+		{
+			udf_expand_file_adinicb(inode, inode->i_size, &err);
+			if (UDF_I_ALLOCTYPE(inode) == ICB_FLAG_AD_IN_ICB)
+			{
+				inode->i_size = UDF_I_LENALLOC(inode);
+				return;
+			}
+			else
+				udf_trunc(inode);
+		}
+		else
+			UDF_I_LENALLOC(inode) = inode->i_size;
+	}
 	else
 		udf_trunc(inode);