X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Fudf%2Ftruncate.c;h=77975ae291a55410c72db68025add299aa0c06f5;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=7dc8a5572ca1900f5ee94db2c9a3695c88a2f909;hpb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;p=linux-2.6.git

diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
index 7dc8a5572..77975ae29 100644
--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -4,11 +4,6 @@
  * PURPOSE
  *	Truncate handling routines for the OSTA-UDF(tm) filesystem.
  *
- * CONTACTS
- *	E-mail regarding any portion of the Linux UDF file system should be
- *	directed to the development team mailing list (run by majordomo):
- *		linux_udf@hpesjro.fc.hp.com
- *
  * COPYRIGHT
  *	This file is distributed under the terms of the GNU General Public
  *	License (GPL). Copies of the GPL can be obtained from:
@@ -33,8 +28,8 @@
 #include "udf_i.h"
 #include "udf_sb.h"
 
-static void extent_trunc(struct inode * inode, kernel_lb_addr bloc, int extoffset,
-	kernel_lb_addr eloc, int8_t etype, uint32_t elen, struct buffer_head *bh, uint32_t nelen)
+static void extent_trunc(struct inode * inode, struct extent_position *epos,
+	kernel_lb_addr eloc, int8_t etype, uint32_t elen, uint32_t nelen)
 {
 	kernel_lb_addr neloc = { 0, 0 };
 	int last_block = (elen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
@@ -54,7 +49,7 @@ static void extent_trunc(struct inode * inode, kernel_lb_addr bloc, int extoffse
 
 	if (elen != nelen)
 	{
-		udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0);
+		udf_write_aext(inode, epos, neloc, nelen, 0);
 		if (last_block - first_block > 0)
 		{
 			if (etype == (EXT_RECORDED_ALLOCATED >> 30))
@@ -68,18 +63,16 @@ static void extent_trunc(struct inode * inode, kernel_lb_addr bloc, int extoffse
 
 void udf_discard_prealloc(struct inode * inode)
 {
-	kernel_lb_addr bloc, eloc;
-	uint32_t extoffset = 0, elen, nelen;
+	struct extent_position epos = { NULL, 0, {0, 0}};
+	kernel_lb_addr eloc;
+	uint32_t elen, nelen;
 	uint64_t lbcount = 0;
 	int8_t etype = -1, netype;
-	struct buffer_head *bh = NULL;
 	int adsize;
 
 	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ||
 		inode->i_size == UDF_I_LENEXTENTS(inode))
-	{
 		return;
-	}
 
 	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
 		adsize = sizeof(short_ad);
@@ -88,52 +81,58 @@ void udf_discard_prealloc(struct inode * inode)
 	else
 		adsize = 0;
 
-	bloc = UDF_I_LOCATION(inode);
+	epos.block = UDF_I_LOCATION(inode);
 
-	while ((netype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
+	/* Find the last extent in the file */
+	while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1)
 	{
 		etype = netype;
 		lbcount += elen;
-		if (lbcount > inode->i_size && lbcount - inode->i_size < inode->i_sb->s_blocksize)
+		if (lbcount > inode->i_size && lbcount - elen < inode->i_size)
 		{
+			WARN_ON(lbcount - inode->i_size >= inode->i_sb->s_blocksize);
 			nelen = elen - (lbcount - inode->i_size);
-			extent_trunc(inode, bloc, extoffset-adsize, eloc, etype, elen, bh, nelen);
+			epos.offset -= adsize;
+			extent_trunc(inode, &epos, eloc, etype, elen, nelen);
+			epos.offset += adsize;
 			lbcount = inode->i_size;
 		}
 	}
-	if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
-	{
-		extoffset -= adsize;
+	if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+		epos.offset -= adsize;
 		lbcount -= elen;
-		extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0);
-		if (!bh)
+		extent_trunc(inode, &epos, eloc, etype, elen, 0);
+		if (!epos.bh)
 		{
-			UDF_I_LENALLOC(inode) = extoffset - udf_file_entry_alloc_offset(inode);
+			UDF_I_LENALLOC(inode) = epos.offset - udf_file_entry_alloc_offset(inode);
 			mark_inode_dirty(inode);
 		}
 		else
 		{
-			struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data);
-			aed->lengthAllocDescs = cpu_to_le32(extoffset - sizeof(struct allocExtDesc));
+			struct allocExtDesc *aed = (struct allocExtDesc *)(epos.bh->b_data);
+			aed->lengthAllocDescs = cpu_to_le32(epos.offset - sizeof(struct allocExtDesc));
 			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
-				udf_update_tag(bh->b_data, extoffset);
+				udf_update_tag(epos.bh->b_data, epos.offset);
 			else
-				udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
-			mark_buffer_dirty_inode(bh, inode);
+				udf_update_tag(epos.bh->b_data, sizeof(struct allocExtDesc));
+			mark_buffer_dirty_inode(epos.bh, inode);
 		}
 	}
 	UDF_I_LENEXTENTS(inode) = lbcount;
 
-	udf_release_data(bh);
+	WARN_ON(lbcount != inode->i_size);
+	brelse(epos.bh);
 }
 
 void udf_truncate_extents(struct inode * inode)
 {
-	kernel_lb_addr bloc, eloc, neloc = { 0, 0 };
-	uint32_t extoffset, elen, offset, nelen = 0, lelen = 0, lenalloc;
+	struct extent_position epos;
+	kernel_lb_addr eloc, neloc = { 0, 0 };
+	uint32_t elen, nelen = 0, indirect_ext_len = 0, lenalloc;
 	int8_t etype;
-	int first_block = inode->i_size >> inode->i_sb->s_blocksize_bits;
-	struct buffer_head *bh = NULL;
+	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;
 
 	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
@@ -141,144 +140,130 @@ void udf_truncate_extents(struct inode * inode)
 	else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
 		adsize = sizeof(long_ad);
 	else
-		adsize = 0;
+		BUG();
 
-	etype = inode_bmap(inode, first_block, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
-	offset += (inode->i_size & (inode->i_sb->s_blocksize - 1));
+	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)
 	{
-		extoffset -= adsize;
-		extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, offset);
-		extoffset += adsize;
-
-		if (offset)
-			lenalloc = extoffset;
+		epos.offset -= adsize;
+		extent_trunc(inode, &epos, eloc, etype, elen, byte_offset);
+		epos.offset += adsize;
+		if (byte_offset)
+			lenalloc = epos.offset;
 		else
-			lenalloc = extoffset - adsize;
+			lenalloc = epos.offset - adsize;
 
-		if (!bh)
+		if (!epos.bh)
 			lenalloc -= udf_file_entry_alloc_offset(inode);
 		else
 			lenalloc -= sizeof(struct allocExtDesc);
 
-		while ((etype = udf_current_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 0)) != -1)
+		while ((etype = udf_current_aext(inode, &epos, &eloc, &elen, 0)) != -1)
 		{
 			if (etype == (EXT_NEXT_EXTENT_ALLOCDECS >> 30))
 			{
-				udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0);
-				extoffset = 0;
-				if (lelen)
+				udf_write_aext(inode, &epos, neloc, nelen, 0);
+				if (indirect_ext_len)
 				{
-					if (!bh)
+					/* We managed to free all extents in the
+					 * indirect extent - free it too */
+					if (!epos.bh)
 						BUG();
-					else
-						memset(bh->b_data, 0x00, sizeof(struct allocExtDesc));
-					udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen);
+					udf_free_blocks(sb, inode, epos.block, 0, indirect_ext_len);
 				}
 				else
 				{
-					if (!bh)
+					if (!epos.bh)
 					{
 						UDF_I_LENALLOC(inode) = lenalloc;
 						mark_inode_dirty(inode);
 					}
 					else
 					{
-						struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data);
+						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)
-							udf_update_tag(bh->b_data, lenalloc +
+						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
-							udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
-						mark_buffer_dirty_inode(bh, inode);
+							udf_update_tag(epos.bh->b_data, sizeof(struct allocExtDesc));
+						mark_buffer_dirty_inode(epos.bh, inode);
 					}
 				}
-
-				udf_release_data(bh);
-				extoffset = sizeof(struct allocExtDesc);
-				bloc = eloc;
-				bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, bloc, 0));
+				brelse(epos.bh);
+				epos.offset = sizeof(struct allocExtDesc);
+				epos.block = eloc;
+				epos.bh = udf_tread(sb, udf_get_lb_pblock(sb, eloc, 0));
 				if (elen)
-					lelen = (elen + inode->i_sb->s_blocksize - 1) >>
-						inode->i_sb->s_blocksize_bits;
+					indirect_ext_len = (elen +
+						sb->s_blocksize - 1) >>
+						sb->s_blocksize_bits;
 				else
-					lelen = 1;
+					indirect_ext_len = 1;
 			}
 			else
 			{
-				extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0);
-				extoffset += adsize;
+				extent_trunc(inode, &epos, eloc, etype, elen, 0);
+				epos.offset += adsize;
 			}
 		}
 
-		if (lelen)
+		if (indirect_ext_len)
 		{
-			if (!bh)
+			if (!epos.bh)
 				BUG();
-			else
-				memset(bh->b_data, 0x00, sizeof(struct allocExtDesc));
-			udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen);
+			udf_free_blocks(sb, inode, epos.block, 0, indirect_ext_len);
 		}
 		else
 		{
-			if (!bh)
+			if (!epos.bh)
 			{
 				UDF_I_LENALLOC(inode) = lenalloc;
 				mark_inode_dirty(inode);
 			}
 			else
 			{
-				struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data);
+				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)
-					udf_update_tag(bh->b_data, lenalloc +
+				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
-					udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
-				mark_buffer_dirty_inode(bh, inode);
+					udf_update_tag(epos.bh->b_data, sizeof(struct allocExtDesc));
+				mark_buffer_dirty_inode(epos.bh, inode);
 			}
 		}
 	}
 	else if (inode->i_size)
 	{
-		if (offset)
+		if (byte_offset)
 		{
-			extoffset -= adsize;
-			etype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1);
-			if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
-			{
-				extoffset -= adsize;
-				elen = EXT_NOT_RECORDED_NOT_ALLOCATED | (elen + offset);
-				udf_write_aext(inode, bloc, &extoffset, eloc, elen, bh, 0);
-			}
-			else if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
-			{
-				kernel_lb_addr neloc = { 0, 0 };
-				extoffset -= adsize;
-				nelen = EXT_NOT_RECORDED_NOT_ALLOCATED |
-					((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);
+			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
-			{
-				if (elen & (inode->i_sb->s_blocksize - 1))
-				{
-					extoffset -= adsize;
-					elen = EXT_RECORDED_ALLOCATED |
-						((elen + inode->i_sb->s_blocksize - 1) &
-						~(inode->i_sb->s_blocksize - 1));
-					udf_write_aext(inode, bloc, &extoffset, eloc, elen, bh, 1);
-				}
-				memset(&eloc, 0x00, sizeof(kernel_lb_addr));
-				elen = EXT_NOT_RECORDED_NOT_ALLOCATED | offset;
-				udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 1);
+			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));
 		}
 	}
 	UDF_I_LENEXTENTS(inode) = inode->i_size;
 
-	udf_release_data(bh);
+	brelse(epos.bh);
 }