280 строки
7.5 KiB
C
280 строки
7.5 KiB
C
/*
|
|
* 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/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);
|
|
}
|