280 lines
7.5 KiB
C
280 lines
7.5 KiB
C
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/*
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* truncate.c
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*
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* PURPOSE
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* Truncate handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1999-2004 Ben Fennema
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* (C) 1999 Stelias Computing Inc
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*
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* HISTORY
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*
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* 02/24/99 blf Created.
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*
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*/
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#include "udfdecl.h"
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/udf_fs.h>
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#include <linux/buffer_head.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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static void extent_trunc(struct inode * inode, kernel_lb_addr bloc, int extoffset,
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kernel_lb_addr eloc, int8_t etype, uint32_t elen, struct buffer_head *bh, uint32_t nelen)
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{
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kernel_lb_addr neloc = { 0, 0 };
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int last_block = (elen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
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int first_block = (nelen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
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if (nelen)
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{
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if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
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{
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udf_free_blocks(inode->i_sb, inode, eloc, 0, last_block);
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etype = (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30);
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}
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else
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neloc = eloc;
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nelen = (etype << 30) | nelen;
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}
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if (elen != nelen)
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{
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udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0);
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if (last_block - first_block > 0)
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{
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if (etype == (EXT_RECORDED_ALLOCATED >> 30))
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mark_inode_dirty(inode);
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if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
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udf_free_blocks(inode->i_sb, inode, eloc, first_block, last_block - first_block);
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}
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}
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}
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void udf_discard_prealloc(struct inode * inode)
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{
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kernel_lb_addr bloc, eloc;
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uint32_t extoffset = 0, elen, nelen;
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uint64_t lbcount = 0;
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int8_t etype = -1, netype;
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struct buffer_head *bh = NULL;
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int adsize;
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if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ||
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inode->i_size == UDF_I_LENEXTENTS(inode))
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{
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return;
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}
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if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
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adsize = sizeof(short_ad);
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else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
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adsize = sizeof(long_ad);
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else
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adsize = 0;
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bloc = UDF_I_LOCATION(inode);
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while ((netype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
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{
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etype = netype;
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lbcount += elen;
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if (lbcount > inode->i_size && lbcount - inode->i_size < inode->i_sb->s_blocksize)
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{
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nelen = elen - (lbcount - inode->i_size);
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extent_trunc(inode, bloc, extoffset-adsize, eloc, etype, elen, bh, nelen);
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lbcount = inode->i_size;
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}
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}
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if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
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{
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extoffset -= adsize;
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lbcount -= elen;
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extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0);
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if (!bh)
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{
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UDF_I_LENALLOC(inode) = extoffset - udf_file_entry_alloc_offset(inode);
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mark_inode_dirty(inode);
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}
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else
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{
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struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data);
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aed->lengthAllocDescs = cpu_to_le32(extoffset - sizeof(struct allocExtDesc));
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if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
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udf_update_tag(bh->b_data, extoffset);
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else
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udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
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mark_buffer_dirty_inode(bh, inode);
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}
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}
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UDF_I_LENEXTENTS(inode) = lbcount;
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udf_release_data(bh);
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}
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void udf_truncate_extents(struct inode * inode)
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{
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kernel_lb_addr bloc, eloc, neloc = { 0, 0 };
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uint32_t extoffset, elen, offset, nelen = 0, lelen = 0, lenalloc;
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int8_t etype;
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int first_block = inode->i_size >> inode->i_sb->s_blocksize_bits;
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struct buffer_head *bh = NULL;
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int adsize;
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if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
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adsize = sizeof(short_ad);
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else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
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adsize = sizeof(long_ad);
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else
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adsize = 0;
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etype = inode_bmap(inode, first_block, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
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offset += (inode->i_size & (inode->i_sb->s_blocksize - 1));
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if (etype != -1)
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{
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extoffset -= adsize;
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extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, offset);
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extoffset += adsize;
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if (offset)
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lenalloc = extoffset;
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else
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lenalloc = extoffset - adsize;
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if (!bh)
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lenalloc -= udf_file_entry_alloc_offset(inode);
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else
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lenalloc -= sizeof(struct allocExtDesc);
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while ((etype = udf_current_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 0)) != -1)
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{
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if (etype == (EXT_NEXT_EXTENT_ALLOCDECS >> 30))
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{
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udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0);
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extoffset = 0;
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if (lelen)
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{
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if (!bh)
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BUG();
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else
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memset(bh->b_data, 0x00, sizeof(struct allocExtDesc));
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udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen);
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}
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else
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{
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if (!bh)
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{
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UDF_I_LENALLOC(inode) = lenalloc;
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mark_inode_dirty(inode);
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}
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else
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{
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struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data);
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aed->lengthAllocDescs = cpu_to_le32(lenalloc);
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if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
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udf_update_tag(bh->b_data, lenalloc +
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sizeof(struct allocExtDesc));
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else
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udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
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mark_buffer_dirty_inode(bh, inode);
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}
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}
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udf_release_data(bh);
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extoffset = sizeof(struct allocExtDesc);
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bloc = eloc;
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bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, bloc, 0));
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if (elen)
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lelen = (elen + inode->i_sb->s_blocksize - 1) >>
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inode->i_sb->s_blocksize_bits;
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else
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lelen = 1;
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}
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else
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{
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extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0);
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extoffset += adsize;
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}
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}
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if (lelen)
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{
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if (!bh)
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BUG();
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else
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memset(bh->b_data, 0x00, sizeof(struct allocExtDesc));
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udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen);
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}
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else
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{
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if (!bh)
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{
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UDF_I_LENALLOC(inode) = lenalloc;
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mark_inode_dirty(inode);
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}
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else
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{
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struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data);
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aed->lengthAllocDescs = cpu_to_le32(lenalloc);
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if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
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udf_update_tag(bh->b_data, lenalloc +
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sizeof(struct allocExtDesc));
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else
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udf_update_tag(bh->b_data, sizeof(struct allocExtDesc));
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mark_buffer_dirty_inode(bh, inode);
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}
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}
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}
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else if (inode->i_size)
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{
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if (offset)
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{
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extoffset -= adsize;
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etype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1);
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if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
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{
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extoffset -= adsize;
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elen = EXT_NOT_RECORDED_NOT_ALLOCATED | (elen + offset);
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udf_write_aext(inode, bloc, &extoffset, eloc, elen, bh, 0);
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}
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else if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
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{
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kernel_lb_addr neloc = { 0, 0 };
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extoffset -= adsize;
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nelen = EXT_NOT_RECORDED_NOT_ALLOCATED |
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((elen + offset + inode->i_sb->s_blocksize - 1) &
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~(inode->i_sb->s_blocksize - 1));
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udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 1);
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udf_add_aext(inode, &bloc, &extoffset, eloc, (etype << 30) | elen, &bh, 1);
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}
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else
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{
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if (elen & (inode->i_sb->s_blocksize - 1))
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{
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extoffset -= adsize;
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elen = EXT_RECORDED_ALLOCATED |
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((elen + inode->i_sb->s_blocksize - 1) &
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~(inode->i_sb->s_blocksize - 1));
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udf_write_aext(inode, bloc, &extoffset, eloc, elen, bh, 1);
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}
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memset(&eloc, 0x00, sizeof(kernel_lb_addr));
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elen = EXT_NOT_RECORDED_NOT_ALLOCATED | offset;
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udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 1);
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}
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}
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}
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UDF_I_LENEXTENTS(inode) = inode->i_size;
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udf_release_data(bh);
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}
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