11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * truncate.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * PURPOSE 51da177e4SLinus Torvalds * Truncate handling routines for the OSTA-UDF(tm) filesystem. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * COPYRIGHT 81da177e4SLinus Torvalds * This file is distributed under the terms of the GNU General Public 91da177e4SLinus Torvalds * License (GPL). Copies of the GPL can be obtained from: 101da177e4SLinus Torvalds * ftp://prep.ai.mit.edu/pub/gnu/GPL 111da177e4SLinus Torvalds * Each contributing author retains all rights to their own work. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * (C) 1999-2004 Ben Fennema 141da177e4SLinus Torvalds * (C) 1999 Stelias Computing Inc 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * HISTORY 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * 02/24/99 blf Created. 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds */ 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include "udfdecl.h" 231da177e4SLinus Torvalds #include <linux/fs.h> 241da177e4SLinus Torvalds #include <linux/mm.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include "udf_i.h" 271da177e4SLinus Torvalds #include "udf_sb.h" 281da177e4SLinus Torvalds 29ff116fc8SJan Kara static void extent_trunc(struct inode *inode, struct extent_position *epos, 3097e961fdSPekka Enberg struct kernel_lb_addr *eloc, int8_t etype, uint32_t elen, 31cb00ea35SCyrill Gorcunov uint32_t nelen) 321da177e4SLinus Torvalds { 335ca4e4beSPekka Enberg struct kernel_lb_addr neloc = {}; 3428de7948SCyrill Gorcunov int last_block = (elen + inode->i_sb->s_blocksize - 1) >> 3528de7948SCyrill Gorcunov inode->i_sb->s_blocksize_bits; 3628de7948SCyrill Gorcunov int first_block = (nelen + inode->i_sb->s_blocksize - 1) >> 3728de7948SCyrill Gorcunov inode->i_sb->s_blocksize_bits; 381da177e4SLinus Torvalds 39cb00ea35SCyrill Gorcunov if (nelen) { 40cb00ea35SCyrill Gorcunov if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 41cb00ea35SCyrill Gorcunov udf_free_blocks(inode->i_sb, inode, eloc, 0, 42cb00ea35SCyrill Gorcunov last_block); 431da177e4SLinus Torvalds etype = (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30); 44cb00ea35SCyrill Gorcunov } else 4597e961fdSPekka Enberg neloc = *eloc; 461da177e4SLinus Torvalds nelen = (etype << 30) | nelen; 471da177e4SLinus Torvalds } 481da177e4SLinus Torvalds 49cb00ea35SCyrill Gorcunov if (elen != nelen) { 5097e961fdSPekka Enberg udf_write_aext(inode, epos, &neloc, nelen, 0); 51b490bdd6SSteve Magnani if (last_block > first_block) { 521da177e4SLinus Torvalds if (etype == (EXT_RECORDED_ALLOCATED >> 30)) 531da177e4SLinus Torvalds mark_inode_dirty(inode); 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 56cb00ea35SCyrill Gorcunov udf_free_blocks(inode->i_sb, inode, eloc, 57cb00ea35SCyrill Gorcunov first_block, 58cb00ea35SCyrill Gorcunov last_block - first_block); 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 6374584ae5SJan Kara /* 6474584ae5SJan Kara * Truncate the last extent to match i_size. This function assumes 6574584ae5SJan Kara * that preallocation extent is already truncated. 6674584ae5SJan Kara */ 6774584ae5SJan Kara void udf_truncate_tail_extent(struct inode *inode) 681da177e4SLinus Torvalds { 6928de7948SCyrill Gorcunov struct extent_position epos = {}; 705ca4e4beSPekka Enberg struct kernel_lb_addr eloc; 71ff116fc8SJan Kara uint32_t elen, nelen; 721da177e4SLinus Torvalds uint64_t lbcount = 0; 731da177e4SLinus Torvalds int8_t etype = -1, netype; 741da177e4SLinus Torvalds int adsize; 7548d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 761da177e4SLinus Torvalds 7748d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB || 7848d6d8ffSMarcin Slusarz inode->i_size == iinfo->i_lenExtents) 791da177e4SLinus Torvalds return; 8074584ae5SJan Kara /* Are we going to delete the file anyway? */ 8174584ae5SJan Kara if (inode->i_nlink == 0) 8274584ae5SJan Kara return; 8374584ae5SJan Kara 8448d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 855ca4e4beSPekka Enberg adsize = sizeof(struct short_ad); 8648d6d8ffSMarcin Slusarz else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 875ca4e4beSPekka Enberg adsize = sizeof(struct long_ad); 8874584ae5SJan Kara else 8974584ae5SJan Kara BUG(); 9074584ae5SJan Kara 9174584ae5SJan Kara /* Find the last extent in the file */ 92cb00ea35SCyrill Gorcunov while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) { 9374584ae5SJan Kara etype = netype; 9474584ae5SJan Kara lbcount += elen; 9574584ae5SJan Kara if (lbcount > inode->i_size) { 9674584ae5SJan Kara if (lbcount - inode->i_size >= inode->i_sb->s_blocksize) 9778ace70cSJoe Perches udf_warn(inode->i_sb, 9878ace70cSJoe Perches "Too long extent after EOF in inode %u: i_size: %lld lbcount: %lld extent %u+%u\n", 9974584ae5SJan Kara (unsigned)inode->i_ino, 10074584ae5SJan Kara (long long)inode->i_size, 10174584ae5SJan Kara (long long)lbcount, 10274584ae5SJan Kara (unsigned)eloc.logicalBlockNum, 10374584ae5SJan Kara (unsigned)elen); 10474584ae5SJan Kara nelen = elen - (lbcount - inode->i_size); 10574584ae5SJan Kara epos.offset -= adsize; 10697e961fdSPekka Enberg extent_trunc(inode, &epos, &eloc, etype, elen, nelen); 10774584ae5SJan Kara epos.offset += adsize; 10874584ae5SJan Kara if (udf_next_aext(inode, &epos, &eloc, &elen, 1) != -1) 10978ace70cSJoe Perches udf_err(inode->i_sb, 11078ace70cSJoe Perches "Extent after EOF in inode %u\n", 11174584ae5SJan Kara (unsigned)inode->i_ino); 11274584ae5SJan Kara break; 11374584ae5SJan Kara } 11474584ae5SJan Kara } 11574584ae5SJan Kara /* This inode entry is in-memory only and thus we don't have to mark 11674584ae5SJan Kara * the inode dirty */ 11748d6d8ffSMarcin Slusarz iinfo->i_lenExtents = inode->i_size; 11874584ae5SJan Kara brelse(epos.bh); 11974584ae5SJan Kara } 12074584ae5SJan Kara 12174584ae5SJan Kara void udf_discard_prealloc(struct inode *inode) 12274584ae5SJan Kara { 12374584ae5SJan Kara struct extent_position epos = { NULL, 0, {0, 0} }; 1245ca4e4beSPekka Enberg struct kernel_lb_addr eloc; 12574584ae5SJan Kara uint32_t elen; 12674584ae5SJan Kara uint64_t lbcount = 0; 12774584ae5SJan Kara int8_t etype = -1, netype; 12874584ae5SJan Kara int adsize; 12948d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 13074584ae5SJan Kara 13148d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB || 13248d6d8ffSMarcin Slusarz inode->i_size == iinfo->i_lenExtents) 13374584ae5SJan Kara return; 1341da177e4SLinus Torvalds 13548d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 1365ca4e4beSPekka Enberg adsize = sizeof(struct short_ad); 13748d6d8ffSMarcin Slusarz else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 1385ca4e4beSPekka Enberg adsize = sizeof(struct long_ad); 1391da177e4SLinus Torvalds else 1401da177e4SLinus Torvalds adsize = 0; 1411da177e4SLinus Torvalds 14248d6d8ffSMarcin Slusarz epos.block = iinfo->i_location; 1431da177e4SLinus Torvalds 144ff116fc8SJan Kara /* Find the last extent in the file */ 14574584ae5SJan Kara while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) { 1461da177e4SLinus Torvalds etype = netype; 1471da177e4SLinus Torvalds lbcount += elen; 1481da177e4SLinus Torvalds } 149ff116fc8SJan Kara if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 150ff116fc8SJan Kara epos.offset -= adsize; 1511da177e4SLinus Torvalds lbcount -= elen; 15297e961fdSPekka Enberg extent_trunc(inode, &epos, &eloc, etype, elen, 0); 15374584ae5SJan Kara if (!epos.bh) { 15448d6d8ffSMarcin Slusarz iinfo->i_lenAlloc = 1554b11111aSMarcin Slusarz epos.offset - 1564b11111aSMarcin Slusarz udf_file_entry_alloc_offset(inode); 1571da177e4SLinus Torvalds mark_inode_dirty(inode); 15874584ae5SJan Kara } else { 159cb00ea35SCyrill Gorcunov struct allocExtDesc *aed = 160cb00ea35SCyrill Gorcunov (struct allocExtDesc *)(epos.bh->b_data); 161cb00ea35SCyrill Gorcunov aed->lengthAllocDescs = 162cb00ea35SCyrill Gorcunov cpu_to_le32(epos.offset - 163cb00ea35SCyrill Gorcunov sizeof(struct allocExtDesc)); 16428de7948SCyrill Gorcunov if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1656c79e987SMarcin Slusarz UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 166ff116fc8SJan Kara udf_update_tag(epos.bh->b_data, epos.offset); 1671da177e4SLinus Torvalds else 168cb00ea35SCyrill Gorcunov udf_update_tag(epos.bh->b_data, 169cb00ea35SCyrill Gorcunov sizeof(struct allocExtDesc)); 170ff116fc8SJan Kara mark_buffer_dirty_inode(epos.bh, inode); 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds } 17374584ae5SJan Kara /* This inode entry is in-memory only and thus we don't have to mark 17474584ae5SJan Kara * the inode dirty */ 17548d6d8ffSMarcin Slusarz iinfo->i_lenExtents = lbcount; 1763bf25cb4SJan Kara brelse(epos.bh); 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 179456390deSmarcin.slusarz@gmail.com static void udf_update_alloc_ext_desc(struct inode *inode, 180456390deSmarcin.slusarz@gmail.com struct extent_position *epos, 181456390deSmarcin.slusarz@gmail.com u32 lenalloc) 182456390deSmarcin.slusarz@gmail.com { 183456390deSmarcin.slusarz@gmail.com struct super_block *sb = inode->i_sb; 184456390deSmarcin.slusarz@gmail.com struct udf_sb_info *sbi = UDF_SB(sb); 185456390deSmarcin.slusarz@gmail.com 186456390deSmarcin.slusarz@gmail.com struct allocExtDesc *aed = (struct allocExtDesc *) (epos->bh->b_data); 187456390deSmarcin.slusarz@gmail.com int len = sizeof(struct allocExtDesc); 188456390deSmarcin.slusarz@gmail.com 189456390deSmarcin.slusarz@gmail.com aed->lengthAllocDescs = cpu_to_le32(lenalloc); 190456390deSmarcin.slusarz@gmail.com if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT) || sbi->s_udfrev >= 0x0201) 191456390deSmarcin.slusarz@gmail.com len += lenalloc; 192456390deSmarcin.slusarz@gmail.com 193456390deSmarcin.slusarz@gmail.com udf_update_tag(epos->bh->b_data, len); 194456390deSmarcin.slusarz@gmail.com mark_buffer_dirty_inode(epos->bh, inode); 195456390deSmarcin.slusarz@gmail.com } 196456390deSmarcin.slusarz@gmail.com 1977e49b6f2SJan Kara /* 1987e49b6f2SJan Kara * Truncate extents of inode to inode->i_size. This function can be used only 1997e49b6f2SJan Kara * for making file shorter. For making file longer, udf_extend_file() has to 2007e49b6f2SJan Kara * be used. 2017e49b6f2SJan Kara */ 2022b42be5eSJan Kara int udf_truncate_extents(struct inode *inode) 2031da177e4SLinus Torvalds { 204ff116fc8SJan Kara struct extent_position epos; 2055ca4e4beSPekka Enberg struct kernel_lb_addr eloc, neloc = {}; 206ff116fc8SJan Kara uint32_t elen, nelen = 0, indirect_ext_len = 0, lenalloc; 2071da177e4SLinus Torvalds int8_t etype; 20831170b6aSJan Kara struct super_block *sb = inode->i_sb; 20931170b6aSJan Kara sector_t first_block = inode->i_size >> sb->s_blocksize_bits, offset; 21060448b1dSJan Kara loff_t byte_offset; 2111da177e4SLinus Torvalds int adsize; 21248d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 2131da177e4SLinus Torvalds 21448d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2155ca4e4beSPekka Enberg adsize = sizeof(struct short_ad); 21648d6d8ffSMarcin Slusarz else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2175ca4e4beSPekka Enberg adsize = sizeof(struct long_ad); 2181da177e4SLinus Torvalds else 219ff116fc8SJan Kara BUG(); 2201da177e4SLinus Torvalds 221ff116fc8SJan Kara etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset); 22228de7948SCyrill Gorcunov byte_offset = (offset << sb->s_blocksize_bits) + 223cb00ea35SCyrill Gorcunov (inode->i_size & (sb->s_blocksize - 1)); 2247e49b6f2SJan Kara if (etype == -1) { 2257e49b6f2SJan Kara /* We should extend the file? */ 2267e49b6f2SJan Kara WARN_ON(byte_offset); 2272b42be5eSJan Kara return 0; 2287e49b6f2SJan Kara } 229ff116fc8SJan Kara epos.offset -= adsize; 23097e961fdSPekka Enberg extent_trunc(inode, &epos, &eloc, etype, elen, byte_offset); 231ff116fc8SJan Kara epos.offset += adsize; 23260448b1dSJan Kara if (byte_offset) 233ff116fc8SJan Kara lenalloc = epos.offset; 2341da177e4SLinus Torvalds else 235ff116fc8SJan Kara lenalloc = epos.offset - adsize; 2361da177e4SLinus Torvalds 237ff116fc8SJan Kara if (!epos.bh) 2381da177e4SLinus Torvalds lenalloc -= udf_file_entry_alloc_offset(inode); 2391da177e4SLinus Torvalds else 2401da177e4SLinus Torvalds lenalloc -= sizeof(struct allocExtDesc); 2411da177e4SLinus Torvalds 2424b11111aSMarcin Slusarz while ((etype = udf_current_aext(inode, &epos, &eloc, 2434b11111aSMarcin Slusarz &elen, 0)) != -1) { 244800552ceSPali Rohár if (etype == (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) { 24597e961fdSPekka Enberg udf_write_aext(inode, &epos, &neloc, nelen, 0); 246cb00ea35SCyrill Gorcunov if (indirect_ext_len) { 247ff116fc8SJan Kara /* We managed to free all extents in the 248ff116fc8SJan Kara * indirect extent - free it too */ 2499de90b76Smarcin.slusarz@gmail.com BUG_ON(!epos.bh); 25017dc59baSJan Kara udf_free_blocks(sb, NULL, &epos.block, 251cb00ea35SCyrill Gorcunov 0, indirect_ext_len); 2529de90b76Smarcin.slusarz@gmail.com } else if (!epos.bh) { 2539de90b76Smarcin.slusarz@gmail.com iinfo->i_lenAlloc = lenalloc; 2541da177e4SLinus Torvalds mark_inode_dirty(inode); 255456390deSmarcin.slusarz@gmail.com } else 256456390deSmarcin.slusarz@gmail.com udf_update_alloc_ext_desc(inode, 257456390deSmarcin.slusarz@gmail.com &epos, lenalloc); 258ff116fc8SJan Kara brelse(epos.bh); 259ff116fc8SJan Kara epos.offset = sizeof(struct allocExtDesc); 260ff116fc8SJan Kara epos.block = eloc; 2614b11111aSMarcin Slusarz epos.bh = udf_tread(sb, 26297e961fdSPekka Enberg udf_get_lb_pblock(sb, &eloc, 0)); 263d3ca4651SJan Kara /* Error reading indirect block? */ 264d3ca4651SJan Kara if (!epos.bh) 2652b42be5eSJan Kara return -EIO; 2661da177e4SLinus Torvalds if (elen) 2674b11111aSMarcin Slusarz indirect_ext_len = 2684b11111aSMarcin Slusarz (elen + sb->s_blocksize - 1) >> 26928de7948SCyrill Gorcunov sb->s_blocksize_bits; 2701da177e4SLinus Torvalds else 271ff116fc8SJan Kara indirect_ext_len = 1; 272cb00ea35SCyrill Gorcunov } else { 2737e49b6f2SJan Kara extent_trunc(inode, &epos, &eloc, etype, elen, 0); 274ff116fc8SJan Kara epos.offset += adsize; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 278cb00ea35SCyrill Gorcunov if (indirect_ext_len) { 2799de90b76Smarcin.slusarz@gmail.com BUG_ON(!epos.bh); 28017dc59baSJan Kara udf_free_blocks(sb, NULL, &epos.block, 0, indirect_ext_len); 2819de90b76Smarcin.slusarz@gmail.com } else if (!epos.bh) { 28248d6d8ffSMarcin Slusarz iinfo->i_lenAlloc = lenalloc; 2831da177e4SLinus Torvalds mark_inode_dirty(inode); 284456390deSmarcin.slusarz@gmail.com } else 285456390deSmarcin.slusarz@gmail.com udf_update_alloc_ext_desc(inode, &epos, lenalloc); 28648d6d8ffSMarcin Slusarz iinfo->i_lenExtents = inode->i_size; 2871da177e4SLinus Torvalds 2883bf25cb4SJan Kara brelse(epos.bh); 2892b42be5eSJan Kara return 0; 2901da177e4SLinus Torvalds } 291