X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fudf%2Ftruncate.c;h=65e19b4f9424c20f8f616b7ee5de3db55f33ed0e;hb=2aac05a91971fbd1bf6cbed78b8731eb7454b9b7;hp=0abd66ce36ea042091bd6564ff17b003257a2d24;hpb=7bf13484d256e21b4bceb07026ac68dbae9dcce5;p=linux-2.6

diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
index 0abd66ce36..65e19b4f94 100644
--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -22,272 +22,294 @@
 #include "udfdecl.h"
 #include <linux/fs.h>
 #include <linux/mm.h>
-#include <linux/udf_fs.h>
 #include <linux/buffer_head.h>
 
 #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;
-	int first_block = (nelen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
+	kernel_lb_addr neloc = {};
+	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 (nelen)
-	{
-		if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
-		{
-			udf_free_blocks(inode->i_sb, inode, eloc, 0, last_block);
+	if (nelen) {
+		if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+			udf_free_blocks(inode->i_sb, inode, eloc, 0,
+					last_block);
 			etype = (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30);
-		}
-		else
+		} else
 			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 (elen != nelen) {
+		udf_write_aext(inode, epos, neloc, nelen, 0);
+		if (last_block - first_block > 0) {
 			if (etype == (EXT_RECORDED_ALLOCATED >> 30))
 				mark_inode_dirty(inode);
 
 			if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
-				udf_free_blocks(inode->i_sb, inode, eloc, first_block, last_block - first_block);
+				udf_free_blocks(inode->i_sb, inode, eloc,
+						first_block,
+						last_block - first_block);
 		}
 	}
 }
 
-void udf_discard_prealloc(struct inode * inode)
+/*
+ * Truncate the last extent to match i_size. This function assumes
+ * that preallocation extent is already truncated.
+ */
+void udf_truncate_tail_extent(struct inode *inode)
 {
-	kernel_lb_addr bloc, eloc;
-	uint32_t extoffset = 0, elen, nelen;
+	struct extent_position epos = {};
+	kernel_lb_addr eloc;
+	uint32_t elen, nelen;
 	uint64_t lbcount = 0;
 	int8_t etype = -1, netype;
-	struct buffer_head *bh = NULL;
 	int adsize;
+	struct udf_inode_info *iinfo = UDF_I(inode);
 
-	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ||
-		inode->i_size == UDF_I_LENEXTENTS(inode))
-	{
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
+	    inode->i_size == iinfo->i_lenExtents)
 		return;
+	/* Are we going to delete the file anyway? */
+	if (inode->i_nlink == 0)
+		return;
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+		adsize = sizeof(short_ad);
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+		adsize = sizeof(long_ad);
+	else
+		BUG();
+
+	/* 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) {
+			if (lbcount - inode->i_size >= inode->i_sb->s_blocksize)
+				printk(KERN_WARNING
+				       "udf_truncate_tail_extent(): Too long "
+				       "extent after EOF in inode %u: i_size: "
+				       "%Ld lbcount: %Ld extent %u+%u\n",
+				       (unsigned)inode->i_ino,
+				       (long long)inode->i_size,
+				       (long long)lbcount,
+				       (unsigned)eloc.logicalBlockNum,
+				       (unsigned)elen);
+			nelen = elen - (lbcount - inode->i_size);
+			epos.offset -= adsize;
+			extent_trunc(inode, &epos, eloc, etype, elen, nelen);
+			epos.offset += adsize;
+			if (udf_next_aext(inode, &epos, &eloc, &elen, 1) != -1)
+				printk(KERN_ERR "udf_truncate_tail_extent(): "
+				       "Extent after EOF in inode %u.\n",
+				       (unsigned)inode->i_ino);
+			break;
+		}
 	}
+	/* This inode entry is in-memory only and thus we don't have to mark
+	 * the inode dirty */
+	iinfo->i_lenExtents = inode->i_size;
+	brelse(epos.bh);
+}
+
+void udf_discard_prealloc(struct inode *inode)
+{
+	struct extent_position epos = { NULL, 0, {0, 0} };
+	kernel_lb_addr eloc;
+	uint32_t elen;
+	uint64_t lbcount = 0;
+	int8_t etype = -1, netype;
+	int adsize;
+	struct udf_inode_info *iinfo = UDF_I(inode);
 
-	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
+	    inode->i_size == iinfo->i_lenExtents)
+		return;
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 		adsize = sizeof(short_ad);
-	else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 		adsize = sizeof(long_ad);
 	else
 		adsize = 0;
 
-	bloc = UDF_I_LOCATION(inode);
+	epos.block = iinfo->i_location;
 
-	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)
-		{
-			nelen = elen - (lbcount - inode->i_size);
-			extent_trunc(inode, bloc, extoffset-adsize, eloc, etype, elen, bh, nelen);
-			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)
-		{
-			UDF_I_LENALLOC(inode) = extoffset - udf_file_entry_alloc_offset(inode);
+		extent_trunc(inode, &epos, eloc, etype, elen, 0);
+		if (!epos.bh) {
+			iinfo->i_lenAlloc =
+				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));
-			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
-				udf_update_tag(bh->b_data, extoffset);
+		} else {
+			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(inode->i_sb)->s_udfrev >= 0x0201)
+				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;
+	/* This inode entry is in-memory only and thus we don't have to mark
+	 * the inode dirty */
+	iinfo->i_lenExtents = lbcount;
+	brelse(epos.bh);
+}
+
+static void udf_update_alloc_ext_desc(struct inode *inode,
+				      struct extent_position *epos,
+				      u32 lenalloc)
+{
+	struct super_block *sb = inode->i_sb;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+
+	struct allocExtDesc *aed = (struct allocExtDesc *) (epos->bh->b_data);
+	int len = sizeof(struct allocExtDesc);
 
-	udf_release_data(bh);
+	aed->lengthAllocDescs =	cpu_to_le32(lenalloc);
+	if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT) || sbi->s_udfrev >= 0x0201)
+		len += lenalloc;
+
+	udf_update_tag(epos->bh->b_data, len);
+	mark_buffer_dirty_inode(epos->bh, inode);
 }
 
-void udf_truncate_extents(struct inode * inode)
+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 = {};
+	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;
+	struct udf_inode_info *iinfo = UDF_I(inode);
 
-	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 		adsize = sizeof(short_ad);
-	else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 		adsize = sizeof(long_ad);
 	else
-		adsize = 0;
-
-	etype = inode_bmap(inode, first_block, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
-	offset += (inode->i_size & (inode->i_sb->s_blocksize - 1));
-	if (etype != -1)
-	{
-		extoffset -= adsize;
-		extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, offset);
-		extoffset += adsize;
+		BUG();
 
-		if (offset)
-			lenalloc = extoffset;
+	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) {
+		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)
-		{
-			if (etype == (EXT_NEXT_EXTENT_ALLOCDECS >> 30))
-			{
-				udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0);
-				extoffset = 0;
-				if (lelen)
-				{
-					if (!bh)
-						BUG();
-					else
-						memset(bh->b_data, 0x00, sizeof(struct allocExtDesc));
-					udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen);
-				}
-				else
-				{
-					if (!bh)
-					{
-						UDF_I_LENALLOC(inode) = lenalloc;
-						mark_inode_dirty(inode);
-					}
-					else
-					{
-						struct allocExtDesc *aed = (struct allocExtDesc *)(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 +
-								sizeof(struct allocExtDesc));
-						else
-							udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
-						mark_buffer_dirty_inode(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));
+		while ((etype = udf_current_aext(inode, &epos, &eloc,
+						 &elen, 0)) != -1) {
+			if (etype == (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
+				udf_write_aext(inode, &epos, neloc, nelen, 0);
+				if (indirect_ext_len) {
+					/* We managed to free all extents in the
+					 * indirect extent - free it too */
+					BUG_ON(!epos.bh);
+					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);
+				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;
-			}
-			else
-			{
-				extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0);
-				extoffset += adsize;
+					indirect_ext_len = 1;
+			} else {
+				extent_trunc(inode, &epos, eloc, etype,
+					     elen, 0);
+				epos.offset += adsize;
 			}
 		}
 
-		if (lelen)
-		{
-			if (!bh)
-				BUG();
-			else
-				memset(bh->b_data, 0x00, sizeof(struct allocExtDesc));
-			udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen);
-		}
-		else
-		{
-			if (!bh)
-			{
-				UDF_I_LENALLOC(inode) = lenalloc;
-				mark_inode_dirty(inode);
-			}
-			else
-			{
-				struct allocExtDesc *aed = (struct allocExtDesc *)(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 +
-						sizeof(struct allocExtDesc));
-				else
-					udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
-				mark_buffer_dirty_inode(bh, inode);
-			}
-		}
-	}
-	else if (inode->i_size)
-	{
-		if (offset)
-		{
+		if (indirect_ext_len) {
+			BUG_ON(!epos.bh);
+			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) {
+			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 ((!bh && extoffset == udf_file_entry_alloc_offset(inode)) ||
-			    (bh && extoffset == sizeof(struct allocExtDesc))) {
-				/* File has no extents at all! */
-				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 {
-				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);
-				}
-				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);
-				}
+			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));
 		}
 	}
-	UDF_I_LENEXTENTS(inode) = inode->i_size;
+	iinfo->i_lenExtents = inode->i_size;
 
-	udf_release_data(bh);
+	brelse(epos.bh);
 }