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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 | /* * 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) { /* * OK, there is not extent covering inode->i_size and * no extent above inode->i_size => truncate is * extending the file by 'offset'. */ if ((!bh && extoffset == udf_file_entry_alloc_offset(inode)) || (bh && extoffset == sizeof(struct allocExtDesc))) { /* File has no extents at all! */ memset(&eloc, 0x00, sizeof(kernel_lb_addr)); elen = EXT_NOT_RECORDED_NOT_ALLOCATED | offset; udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 1); } else { 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); } |