Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 284 insertions, 0 deletions

diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
new file mode 100644
index 0000000..7dc8a55
--- /dev/null
+++ b/fs/udf/truncate.c
@@ -0,0 +1,284 @@
+/*
+ * truncate.c
+ *
+ * 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:
+ *		ftp://prep.ai.mit.edu/pub/gnu/GPL
+ *	Each contributing author retains all rights to their own work.
+ *
+ *  (C) 1999-2004 Ben Fennema
+ *  (C) 1999 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ *  02/24/99 blf  Created.
+ *
+ */
+
+#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)
+{
+	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;
+
+	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
+			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 == (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);
+		}
+	}
+}
+
+void udf_discard_prealloc(struct inode * inode)
+{
+	kernel_lb_addr bloc, eloc;
+	uint32_t extoffset = 0, 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);
+	else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
+		adsize = sizeof(long_ad);
+	else
+		adsize = 0;
+
+	bloc = UDF_I_LOCATION(inode);
+
+	while ((netype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 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;
+		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);
+			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
+				udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
+			mark_buffer_dirty_inode(bh, inode);
+		}
+	}
+	UDF_I_LENEXTENTS(inode) = lbcount;
+
+	udf_release_data(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;
+	int8_t etype;
+	int first_block = inode->i_size >> inode->i_sb->s_blocksize_bits;
+	struct buffer_head *bh = NULL;
+	int adsize;
+
+	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
+		adsize = sizeof(short_ad);
+	else if (UDF_I_ALLOCTYPE(inode) == 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;
+
+		if (offset)
+			lenalloc = extoffset;
+		else
+			lenalloc = extoffset - adsize;
+
+		if (!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));
+				if (elen)
+					lelen = (elen + inode->i_sb->s_blocksize - 1) >>
+						inode->i_sb->s_blocksize_bits;
+				else
+					lelen = 1;
+			}
+			else
+			{
+				extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0);
+				extoffset += 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)
+		{
+			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);
+			}
+		}
+	}
+	UDF_I_LENEXTENTS(inode) = inode->i_size;
+
+	udf_release_data(bh);
+}