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-rw-r--r--ANDROID_3.4.5/fs/udf/truncate.c287
1 files changed, 0 insertions, 287 deletions
diff --git a/ANDROID_3.4.5/fs/udf/truncate.c b/ANDROID_3.4.5/fs/udf/truncate.c
deleted file mode 100644
index 4b98fee8..00000000
--- a/ANDROID_3.4.5/fs/udf/truncate.c
+++ /dev/null
@@ -1,287 +0,0 @@
-/*
- * truncate.c
- *
- * PURPOSE
- * Truncate handling routines for the OSTA-UDF(tm) filesystem.
- *
- * 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/buffer_head.h>
-
-#include "udf_i.h"
-#include "udf_sb.h"
-
-static void extent_trunc(struct inode *inode, struct extent_position *epos,
- struct kernel_lb_addr *eloc, int8_t etype, uint32_t elen,
- uint32_t nelen)
-{
- struct 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);
- etype = (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30);
- } else
- neloc = *eloc;
- nelen = (etype << 30) | nelen;
- }
-
- 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);
- }
- }
-}
-
-/*
- * 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)
-{
- struct extent_position epos = {};
- struct kernel_lb_addr eloc;
- uint32_t elen, nelen;
- uint64_t lbcount = 0;
- int8_t etype = -1, netype;
- int adsize;
- struct udf_inode_info *iinfo = UDF_I(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(struct short_ad);
- else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
- adsize = sizeof(struct 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)
- udf_warn(inode->i_sb,
- "Too long extent after EOF in inode %u: i_size: %lld lbcount: %lld 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)
- udf_err(inode->i_sb,
- "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} };
- struct 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 (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(struct short_ad);
- else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
- adsize = sizeof(struct long_ad);
- else
- adsize = 0;
-
- epos.block = iinfo->i_location;
-
- /* Find the last extent in the file */
- while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
- etype = netype;
- lbcount += elen;
- }
- if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
- epos.offset -= adsize;
- lbcount -= elen;
- 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 *)(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(epos.bh->b_data,
- sizeof(struct allocExtDesc));
- mark_buffer_dirty_inode(epos.bh, inode);
- }
- }
- /* 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);
-
- 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);
-}
-
-/*
- * 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;
- struct kernel_lb_addr eloc, neloc = {};
- uint32_t elen, nelen = 0, indirect_ext_len = 0, lenalloc;
- int8_t etype;
- 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 (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
- adsize = sizeof(struct short_ad);
- else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
- adsize = sizeof(struct long_ad);
- else
- BUG();
-
- 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) {
- /* 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;
- if (byte_offset)
- lenalloc = epos.offset;
- else
- lenalloc = epos.offset - adsize;
-
- if (!epos.bh)
- lenalloc -= udf_file_entry_alloc_offset(inode);
- else
- lenalloc -= sizeof(struct allocExtDesc);
-
- 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)
- indirect_ext_len =
- (elen + sb->s_blocksize - 1) >>
- sb->s_blocksize_bits;
- else
- indirect_ext_len = 1;
- } else {
- 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);
- } else if (!epos.bh) {
- iinfo->i_lenAlloc = lenalloc;
- mark_inode_dirty(inode);
- } else
- udf_update_alloc_ext_desc(inode, &epos, lenalloc);
- iinfo->i_lenExtents = inode->i_size;
-
- brelse(epos.bh);
-}
generated by cgit (git 2.34.1) at 2025-02-03 16:02:38 +0000