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 { 123cfe4c1b2SJan Kara struct extent_position epos = {}; 124cfe4c1b2SJan Kara struct extent_position prev_epos = {}; 1255ca4e4beSPekka Enberg struct kernel_lb_addr eloc; 12674584ae5SJan Kara uint32_t elen; 12774584ae5SJan Kara uint64_t lbcount = 0; 1281fb40763SColin Ian King int8_t etype = -1; 12948d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 130*f768dc3cSYangtao Li int bsize = i_blocksize(inode); 13174584ae5SJan Kara 13248d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB || 1336ad53f0fSJan Kara ALIGN(inode->i_size, bsize) == ALIGN(iinfo->i_lenExtents, bsize)) 13474584ae5SJan Kara return; 1351da177e4SLinus Torvalds 13648d6d8ffSMarcin Slusarz epos.block = iinfo->i_location; 1371da177e4SLinus Torvalds 138ff116fc8SJan Kara /* Find the last extent in the file */ 1391fb40763SColin Ian King while (udf_next_aext(inode, &epos, &eloc, &elen, 0) != -1) { 140cfe4c1b2SJan Kara brelse(prev_epos.bh); 141cfe4c1b2SJan Kara prev_epos = epos; 142cfe4c1b2SJan Kara if (prev_epos.bh) 143cfe4c1b2SJan Kara get_bh(prev_epos.bh); 144cfe4c1b2SJan Kara 145cfe4c1b2SJan Kara etype = udf_next_aext(inode, &epos, &eloc, &elen, 1); 1461da177e4SLinus Torvalds lbcount += elen; 1471da177e4SLinus Torvalds } 148ff116fc8SJan Kara if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 1491da177e4SLinus Torvalds lbcount -= elen; 150cfe4c1b2SJan Kara udf_delete_aext(inode, prev_epos); 151cfe4c1b2SJan Kara udf_free_blocks(inode->i_sb, inode, &eloc, 0, 152*f768dc3cSYangtao Li DIV_ROUND_UP(elen, bsize)); 1531da177e4SLinus Torvalds } 15474584ae5SJan Kara /* This inode entry is in-memory only and thus we don't have to mark 15574584ae5SJan Kara * the inode dirty */ 15648d6d8ffSMarcin Slusarz iinfo->i_lenExtents = lbcount; 1573bf25cb4SJan Kara brelse(epos.bh); 158cfe4c1b2SJan Kara brelse(prev_epos.bh); 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 161456390deSmarcin.slusarz@gmail.com static void udf_update_alloc_ext_desc(struct inode *inode, 162456390deSmarcin.slusarz@gmail.com struct extent_position *epos, 163456390deSmarcin.slusarz@gmail.com u32 lenalloc) 164456390deSmarcin.slusarz@gmail.com { 165456390deSmarcin.slusarz@gmail.com struct super_block *sb = inode->i_sb; 166456390deSmarcin.slusarz@gmail.com struct udf_sb_info *sbi = UDF_SB(sb); 167456390deSmarcin.slusarz@gmail.com 168456390deSmarcin.slusarz@gmail.com struct allocExtDesc *aed = (struct allocExtDesc *) (epos->bh->b_data); 169456390deSmarcin.slusarz@gmail.com int len = sizeof(struct allocExtDesc); 170456390deSmarcin.slusarz@gmail.com 171456390deSmarcin.slusarz@gmail.com aed->lengthAllocDescs = cpu_to_le32(lenalloc); 172456390deSmarcin.slusarz@gmail.com if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT) || sbi->s_udfrev >= 0x0201) 173456390deSmarcin.slusarz@gmail.com len += lenalloc; 174456390deSmarcin.slusarz@gmail.com 175456390deSmarcin.slusarz@gmail.com udf_update_tag(epos->bh->b_data, len); 176456390deSmarcin.slusarz@gmail.com mark_buffer_dirty_inode(epos->bh, inode); 177456390deSmarcin.slusarz@gmail.com } 178456390deSmarcin.slusarz@gmail.com 1797e49b6f2SJan Kara /* 1807e49b6f2SJan Kara * Truncate extents of inode to inode->i_size. This function can be used only 1817e49b6f2SJan Kara * for making file shorter. For making file longer, udf_extend_file() has to 1827e49b6f2SJan Kara * be used. 1837e49b6f2SJan Kara */ 1842b42be5eSJan Kara int udf_truncate_extents(struct inode *inode) 1851da177e4SLinus Torvalds { 186ff116fc8SJan Kara struct extent_position epos; 1875ca4e4beSPekka Enberg struct kernel_lb_addr eloc, neloc = {}; 188ff116fc8SJan Kara uint32_t elen, nelen = 0, indirect_ext_len = 0, lenalloc; 1891da177e4SLinus Torvalds int8_t etype; 19031170b6aSJan Kara struct super_block *sb = inode->i_sb; 19131170b6aSJan Kara sector_t first_block = inode->i_size >> sb->s_blocksize_bits, offset; 19260448b1dSJan Kara loff_t byte_offset; 1931da177e4SLinus Torvalds int adsize; 19448d6d8ffSMarcin Slusarz struct udf_inode_info *iinfo = UDF_I(inode); 1951da177e4SLinus Torvalds 19648d6d8ffSMarcin Slusarz if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 1975ca4e4beSPekka Enberg adsize = sizeof(struct short_ad); 19848d6d8ffSMarcin Slusarz else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 1995ca4e4beSPekka Enberg adsize = sizeof(struct long_ad); 2001da177e4SLinus Torvalds else 201ff116fc8SJan Kara BUG(); 2021da177e4SLinus Torvalds 203ff116fc8SJan Kara etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset); 20428de7948SCyrill Gorcunov byte_offset = (offset << sb->s_blocksize_bits) + 205cb00ea35SCyrill Gorcunov (inode->i_size & (sb->s_blocksize - 1)); 2067e49b6f2SJan Kara if (etype == -1) { 2077e49b6f2SJan Kara /* We should extend the file? */ 2087e49b6f2SJan Kara WARN_ON(byte_offset); 2092b42be5eSJan Kara return 0; 2107e49b6f2SJan Kara } 211ff116fc8SJan Kara epos.offset -= adsize; 21297e961fdSPekka Enberg extent_trunc(inode, &epos, &eloc, etype, elen, byte_offset); 213ff116fc8SJan Kara epos.offset += adsize; 21460448b1dSJan Kara if (byte_offset) 215ff116fc8SJan Kara lenalloc = epos.offset; 2161da177e4SLinus Torvalds else 217ff116fc8SJan Kara lenalloc = epos.offset - adsize; 2181da177e4SLinus Torvalds 219ff116fc8SJan Kara if (!epos.bh) 2201da177e4SLinus Torvalds lenalloc -= udf_file_entry_alloc_offset(inode); 2211da177e4SLinus Torvalds else 2221da177e4SLinus Torvalds lenalloc -= sizeof(struct allocExtDesc); 2231da177e4SLinus Torvalds 2244b11111aSMarcin Slusarz while ((etype = udf_current_aext(inode, &epos, &eloc, 2254b11111aSMarcin Slusarz &elen, 0)) != -1) { 226800552ceSPali Rohár if (etype == (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) { 22797e961fdSPekka Enberg udf_write_aext(inode, &epos, &neloc, nelen, 0); 228cb00ea35SCyrill Gorcunov if (indirect_ext_len) { 229ff116fc8SJan Kara /* We managed to free all extents in the 230ff116fc8SJan Kara * indirect extent - free it too */ 2319de90b76Smarcin.slusarz@gmail.com BUG_ON(!epos.bh); 23217dc59baSJan Kara udf_free_blocks(sb, NULL, &epos.block, 233cb00ea35SCyrill Gorcunov 0, indirect_ext_len); 2349de90b76Smarcin.slusarz@gmail.com } else if (!epos.bh) { 2359de90b76Smarcin.slusarz@gmail.com iinfo->i_lenAlloc = lenalloc; 2361da177e4SLinus Torvalds mark_inode_dirty(inode); 237456390deSmarcin.slusarz@gmail.com } else 238456390deSmarcin.slusarz@gmail.com udf_update_alloc_ext_desc(inode, 239456390deSmarcin.slusarz@gmail.com &epos, lenalloc); 240ff116fc8SJan Kara brelse(epos.bh); 241ff116fc8SJan Kara epos.offset = sizeof(struct allocExtDesc); 242ff116fc8SJan Kara epos.block = eloc; 243101ee137SJan Kara epos.bh = sb_bread(sb, 24497e961fdSPekka Enberg udf_get_lb_pblock(sb, &eloc, 0)); 245d3ca4651SJan Kara /* Error reading indirect block? */ 246d3ca4651SJan Kara if (!epos.bh) 2472b42be5eSJan Kara return -EIO; 2481da177e4SLinus Torvalds if (elen) 2494b11111aSMarcin Slusarz indirect_ext_len = 2504b11111aSMarcin Slusarz (elen + sb->s_blocksize - 1) >> 25128de7948SCyrill Gorcunov sb->s_blocksize_bits; 2521da177e4SLinus Torvalds else 253ff116fc8SJan Kara indirect_ext_len = 1; 254cb00ea35SCyrill Gorcunov } else { 2557e49b6f2SJan Kara extent_trunc(inode, &epos, &eloc, etype, elen, 0); 256ff116fc8SJan Kara epos.offset += adsize; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 260cb00ea35SCyrill Gorcunov if (indirect_ext_len) { 2619de90b76Smarcin.slusarz@gmail.com BUG_ON(!epos.bh); 26217dc59baSJan Kara udf_free_blocks(sb, NULL, &epos.block, 0, indirect_ext_len); 2639de90b76Smarcin.slusarz@gmail.com } else if (!epos.bh) { 26448d6d8ffSMarcin Slusarz iinfo->i_lenAlloc = lenalloc; 2651da177e4SLinus Torvalds mark_inode_dirty(inode); 266456390deSmarcin.slusarz@gmail.com } else 267456390deSmarcin.slusarz@gmail.com udf_update_alloc_ext_desc(inode, &epos, lenalloc); 26848d6d8ffSMarcin Slusarz iinfo->i_lenExtents = inode->i_size; 2691da177e4SLinus Torvalds 2703bf25cb4SJan Kara brelse(epos.bh); 2712b42be5eSJan Kara return 0; 2721da177e4SLinus Torvalds } 273