1 /** quotaio.c 2 * 3 * Generic IO operations on quotafiles 4 * Jan Kara <jack@suse.cz> - sponsored by SuSE CR 5 * Aditya Kali <adityakali@google.com> - Ported to e2fsprogs 6 */ 7 8 #include "config.h" 9 #include <stdio.h> 10 #include <errno.h> 11 #include <string.h> 12 #include <unistd.h> 13 #include <stdlib.h> 14 #include <time.h> 15 #include <sys/types.h> 16 #include <sys/stat.h> 17 #include <sys/file.h> 18 #include <assert.h> 19 20 #include "common.h" 21 #include "quotaio.h" 22 23 static const char * const extensions[MAXQUOTAS] = { 24 [USRQUOTA] = "user", 25 [GRPQUOTA] = "group", 26 [PRJQUOTA] = "project", 27 }; 28 static const char * const basenames[] = { 29 "", /* undefined */ 30 "quota", /* QFMT_VFS_OLD */ 31 "aquota", /* QFMT_VFS_V0 */ 32 "", /* QFMT_OCFS2 */ 33 "aquota" /* QFMT_VFS_V1 */ 34 }; 35 36 /* Header in all newer quotafiles */ 37 struct disk_dqheader { 38 __le32 dqh_magic; 39 __le32 dqh_version; 40 } __attribute__ ((packed)); 41 42 /** 43 * Convert type of quota to written representation 44 */ 45 const char *quota_type2name(enum quota_type qtype) 46 { 47 if (qtype >= MAXQUOTAS) 48 return "unknown"; 49 return extensions[qtype]; 50 } 51 52 ext2_ino_t quota_type2inum(enum quota_type qtype, 53 struct ext2_super_block *sb) 54 { 55 switch (qtype) { 56 case USRQUOTA: 57 return EXT4_USR_QUOTA_INO; 58 case GRPQUOTA: 59 return EXT4_GRP_QUOTA_INO; 60 case PRJQUOTA: 61 return sb->s_prj_quota_inum; 62 default: 63 return 0; 64 } 65 return 0; 66 } 67 68 /** 69 * Creates a quota file name for given type and format. 70 */ 71 const char *quota_get_qf_name(enum quota_type type, int fmt, char *buf) 72 { 73 if (!buf) 74 return NULL; 75 snprintf(buf, QUOTA_NAME_LEN, "%s.%s", 76 basenames[fmt], extensions[type]); 77 78 return buf; 79 } 80 81 /* 82 * Set grace time if needed 83 */ 84 void update_grace_times(struct dquot *q) 85 { 86 time_t now; 87 88 time(&now); 89 if (q->dq_dqb.dqb_bsoftlimit && toqb(q->dq_dqb.dqb_curspace) > 90 q->dq_dqb.dqb_bsoftlimit) { 91 if (!q->dq_dqb.dqb_btime) 92 q->dq_dqb.dqb_btime = 93 now + q->dq_h->qh_info.dqi_bgrace; 94 } else { 95 q->dq_dqb.dqb_btime = 0; 96 } 97 98 if (q->dq_dqb.dqb_isoftlimit && q->dq_dqb.dqb_curinodes > 99 q->dq_dqb.dqb_isoftlimit) { 100 if (!q->dq_dqb.dqb_itime) 101 q->dq_dqb.dqb_itime = 102 now + q->dq_h->qh_info.dqi_igrace; 103 } else { 104 q->dq_dqb.dqb_itime = 0; 105 } 106 } 107 108 errcode_t quota_inode_truncate(ext2_filsys fs, ext2_ino_t ino) 109 { 110 struct ext2_inode inode; 111 errcode_t err; 112 enum quota_type qtype; 113 114 if ((err = ext2fs_read_inode(fs, ino, &inode))) 115 return err; 116 117 for (qtype = 0; qtype < MAXQUOTAS; qtype++) 118 if (ino == quota_type2inum(qtype, fs->super)) 119 break; 120 121 if (qtype != MAXQUOTAS) { 122 inode.i_dtime = fs->now ? fs->now : time(0); 123 if (!ext2fs_inode_has_valid_blocks2(fs, &inode)) 124 return 0; 125 err = ext2fs_punch(fs, ino, &inode, NULL, 0, ~0ULL); 126 if (err) 127 return err; 128 fs->flags &= ~EXT2_FLAG_SUPER_ONLY; 129 memset(&inode, 0, sizeof(struct ext2_inode)); 130 } else { 131 inode.i_flags &= ~EXT2_IMMUTABLE_FL; 132 } 133 err = ext2fs_write_inode(fs, ino, &inode); 134 return err; 135 } 136 137 /* Functions to read/write quota file. */ 138 static unsigned int quota_write_nomount(struct quota_file *qf, 139 ext2_loff_t offset, 140 void *buf, unsigned int size) 141 { 142 ext2_file_t e2_file = qf->e2_file; 143 unsigned int bytes_written = 0; 144 errcode_t err; 145 146 err = ext2fs_file_llseek(e2_file, offset, EXT2_SEEK_SET, NULL); 147 if (err) { 148 log_err("ext2fs_file_llseek failed: %ld", err); 149 return 0; 150 } 151 152 err = ext2fs_file_write(e2_file, buf, size, &bytes_written); 153 if (err) { 154 log_err("ext2fs_file_write failed: %ld", err); 155 return 0; 156 } 157 158 /* Correct inode.i_size is set in end_io. */ 159 return bytes_written; 160 } 161 162 static unsigned int quota_read_nomount(struct quota_file *qf, 163 ext2_loff_t offset, 164 void *buf, unsigned int size) 165 { 166 ext2_file_t e2_file = qf->e2_file; 167 unsigned int bytes_read = 0; 168 errcode_t err; 169 170 err = ext2fs_file_llseek(e2_file, offset, EXT2_SEEK_SET, NULL); 171 if (err) { 172 log_err("ext2fs_file_llseek failed: %ld", err); 173 return 0; 174 } 175 176 err = ext2fs_file_read(e2_file, buf, size, &bytes_read); 177 if (err) { 178 log_err("ext2fs_file_read failed: %ld", err); 179 return 0; 180 } 181 182 return bytes_read; 183 } 184 185 /* 186 * Detect quota format and initialize quota IO 187 */ 188 errcode_t quota_file_open(quota_ctx_t qctx, struct quota_handle *h, 189 ext2_ino_t qf_ino, enum quota_type qtype, 190 int fmt, int flags) 191 { 192 ext2_filsys fs = qctx->fs; 193 ext2_file_t e2_file; 194 errcode_t err; 195 int allocated_handle = 0; 196 197 if (qtype >= MAXQUOTAS) 198 return EINVAL; 199 200 if (fmt == -1) 201 fmt = QFMT_VFS_V1; 202 203 err = ext2fs_read_bitmaps(fs); 204 if (err) 205 return err; 206 207 if (qf_ino == 0) 208 qf_ino = *quota_sb_inump(fs->super, qtype); 209 210 log_debug("Opening quota ino=%u, type=%d", qf_ino, qtype); 211 err = ext2fs_file_open(fs, qf_ino, flags, &e2_file); 212 if (err) { 213 log_err("ext2fs_file_open failed: %s", error_message(err)); 214 return err; 215 } 216 217 if (!h) { 218 if (qctx->quota_file[qtype]) { 219 h = qctx->quota_file[qtype]; 220 if (((flags & EXT2_FILE_WRITE) == 0) || 221 (h->qh_file_flags & EXT2_FILE_WRITE)) { 222 ext2fs_file_close(e2_file); 223 return 0; 224 } 225 (void) quota_file_close(qctx, h); 226 } 227 err = ext2fs_get_mem(sizeof(struct quota_handle), &h); 228 if (err) { 229 log_err("Unable to allocate quota handle"); 230 ext2fs_file_close(e2_file); 231 return err; 232 } 233 allocated_handle = 1; 234 } 235 236 h->qh_qf.e2_file = e2_file; 237 h->qh_qf.fs = fs; 238 h->qh_qf.ino = qf_ino; 239 h->e2fs_write = quota_write_nomount; 240 h->e2fs_read = quota_read_nomount; 241 h->qh_file_flags = flags; 242 h->qh_io_flags = 0; 243 h->qh_type = qtype; 244 h->qh_fmt = fmt; 245 memset(&h->qh_info, 0, sizeof(h->qh_info)); 246 h->qh_ops = "afile_ops_2; 247 248 if (h->qh_ops->check_file && 249 (h->qh_ops->check_file(h, qtype, fmt) == 0)) { 250 log_err("qh_ops->check_file failed"); 251 err = EIO; 252 goto errout; 253 } 254 255 if (h->qh_ops->init_io && (h->qh_ops->init_io(h) < 0)) { 256 log_err("qh_ops->init_io failed"); 257 err = EIO; 258 goto errout; 259 } 260 if (allocated_handle) 261 qctx->quota_file[qtype] = h; 262 263 return 0; 264 errout: 265 ext2fs_file_close(e2_file); 266 if (allocated_handle) 267 ext2fs_free_mem(&h); 268 return err; 269 } 270 271 static errcode_t quota_inode_init_new(ext2_filsys fs, ext2_ino_t ino) 272 { 273 struct ext2_inode inode; 274 errcode_t err = 0; 275 276 err = ext2fs_read_inode(fs, ino, &inode); 277 if (err) { 278 log_err("ex2fs_read_inode failed"); 279 return err; 280 } 281 282 if (EXT2_I_SIZE(&inode)) { 283 err = quota_inode_truncate(fs, ino); 284 if (err) 285 return err; 286 } 287 288 memset(&inode, 0, sizeof(struct ext2_inode)); 289 ext2fs_iblk_set(fs, &inode, 0); 290 inode.i_atime = inode.i_mtime = 291 inode.i_ctime = fs->now ? fs->now : time(0); 292 inode.i_links_count = 1; 293 inode.i_mode = LINUX_S_IFREG | 0600; 294 inode.i_flags |= EXT2_IMMUTABLE_FL; 295 if (ext2fs_has_feature_extents(fs->super)) 296 inode.i_flags |= EXT4_EXTENTS_FL; 297 298 err = ext2fs_write_new_inode(fs, ino, &inode); 299 if (err) { 300 log_err("ext2fs_write_new_inode failed: %ld", err); 301 return err; 302 } 303 return err; 304 } 305 306 /* 307 * Create new quotafile of specified format on given filesystem 308 */ 309 errcode_t quota_file_create(struct quota_handle *h, ext2_filsys fs, 310 enum quota_type qtype, int fmt) 311 { 312 ext2_file_t e2_file; 313 errcode_t err; 314 ext2_ino_t qf_inum = 0; 315 316 if (fmt == -1) 317 fmt = QFMT_VFS_V1; 318 319 h->qh_qf.fs = fs; 320 qf_inum = quota_type2inum(qtype, fs->super); 321 if (qf_inum == 0 && qtype == PRJQUOTA) { 322 err = ext2fs_new_inode(fs, EXT2_ROOT_INO, LINUX_S_IFREG | 0600, 323 0, &qf_inum); 324 if (err) 325 return err; 326 ext2fs_inode_alloc_stats2(fs, qf_inum, +1, 0); 327 ext2fs_mark_ib_dirty(fs); 328 } else if (qf_inum == 0) { 329 return EXT2_ET_BAD_INODE_NUM; 330 } 331 332 err = ext2fs_read_bitmaps(fs); 333 if (err) 334 goto out_err; 335 336 err = quota_inode_init_new(fs, qf_inum); 337 if (err) { 338 log_err("init_new_quota_inode failed"); 339 goto out_err; 340 } 341 h->qh_qf.ino = qf_inum; 342 h->qh_file_flags = EXT2_FILE_WRITE | EXT2_FILE_CREATE; 343 h->e2fs_write = quota_write_nomount; 344 h->e2fs_read = quota_read_nomount; 345 346 log_debug("Creating quota ino=%u, type=%d", qf_inum, qtype); 347 err = ext2fs_file_open(fs, qf_inum, h->qh_file_flags, &e2_file); 348 if (err) { 349 log_err("ext2fs_file_open failed: %ld", err); 350 goto out_err; 351 } 352 h->qh_qf.e2_file = e2_file; 353 354 h->qh_io_flags = 0; 355 h->qh_type = qtype; 356 h->qh_fmt = fmt; 357 memset(&h->qh_info, 0, sizeof(h->qh_info)); 358 h->qh_ops = "afile_ops_2; 359 360 if (h->qh_ops->new_io && (h->qh_ops->new_io(h) < 0)) { 361 log_err("qh_ops->new_io failed"); 362 err = EIO; 363 goto out_err1; 364 } 365 366 return 0; 367 368 out_err1: 369 ext2fs_file_close(e2_file); 370 out_err: 371 372 if (qf_inum) 373 quota_inode_truncate(fs, qf_inum); 374 375 return err; 376 } 377 378 /* 379 * Close quotafile and release handle 380 */ 381 errcode_t quota_file_close(quota_ctx_t qctx, struct quota_handle *h) 382 { 383 if (h->qh_io_flags & IOFL_INFODIRTY) { 384 if (h->qh_ops->write_info && h->qh_ops->write_info(h) < 0) 385 return EIO; 386 h->qh_io_flags &= ~IOFL_INFODIRTY; 387 } 388 389 if (h->qh_ops->end_io && h->qh_ops->end_io(h) < 0) 390 return EIO; 391 if (h->qh_qf.e2_file) 392 ext2fs_file_close(h->qh_qf.e2_file); 393 if (qctx->quota_file[h->qh_type] == h) 394 ext2fs_free_mem(&qctx->quota_file[h->qh_type]); 395 return 0; 396 } 397 398 /* 399 * Create empty quota structure 400 */ 401 struct dquot *get_empty_dquot(void) 402 { 403 struct dquot *dquot; 404 405 if (ext2fs_get_memzero(sizeof(struct dquot), &dquot)) { 406 log_err("Failed to allocate dquot"); 407 return NULL; 408 } 409 410 dquot->dq_id = -1; 411 return dquot; 412 }