quotaio_v2.c revision d1154eb460efe588eaed3d439c1caaca149fa362
1/* 2 * Implementation of new quotafile format 3 * 4 * Jan Kara <jack@suse.cz> - sponsored by SuSE CR 5 */ 6 7#include "config.h" 8#include <sys/types.h> 9#include <errno.h> 10#include <stdio.h> 11#include <stdlib.h> 12#include <string.h> 13#include <unistd.h> 14#include <asm/byteorder.h> 15 16#include "common.h" 17#include "quotaio_v2.h" 18#include "dqblk_v2.h" 19#include "quotaio.h" 20#include "quotaio_tree.h" 21 22typedef char *dqbuf_t; 23 24static int v2_check_file(struct quota_handle *h, int type, int fmt); 25static int v2_init_io(struct quota_handle *h); 26static int v2_new_io(struct quota_handle *h); 27static int v2_write_info(struct quota_handle *h); 28static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id); 29static int v2_commit_dquot(struct dquot *dquot, int flags); 30static int v2_scan_dquots(struct quota_handle *h, 31 int (*process_dquot) (struct dquot *dquot, 32 char *dqname)); 33static int v2_report(struct quota_handle *h, int verbose); 34 35struct quotafile_ops quotafile_ops_2 = { 36check_file: v2_check_file, 37init_io: v2_init_io, 38new_io: v2_new_io, 39write_info: v2_write_info, 40read_dquot: v2_read_dquot, 41commit_dquot: v2_commit_dquot, 42scan_dquots: v2_scan_dquots, 43report: v2_report 44}; 45 46#define getdqbuf() smalloc(V2_DQBLKSIZE) 47#define freedqbuf(buf) free(buf) 48 49/* 50 * Copy dquot from disk to memory 51 */ 52static void v2r1_disk2memdqblk(struct dquot *dquot, void *dp) 53{ 54 struct util_dqblk *m = &dquot->dq_dqb; 55 struct v2r1_disk_dqblk *d = dp, empty; 56 57 dquot->dq_id = __le32_to_cpu(d->dqb_id); 58 m->dqb_ihardlimit = __le64_to_cpu(d->dqb_ihardlimit); 59 m->dqb_isoftlimit = __le64_to_cpu(d->dqb_isoftlimit); 60 m->dqb_bhardlimit = __le64_to_cpu(d->dqb_bhardlimit); 61 m->dqb_bsoftlimit = __le64_to_cpu(d->dqb_bsoftlimit); 62 m->dqb_curinodes = __le64_to_cpu(d->dqb_curinodes); 63 m->dqb_curspace = __le64_to_cpu(d->dqb_curspace); 64 m->dqb_itime = __le64_to_cpu(d->dqb_itime); 65 m->dqb_btime = __le64_to_cpu(d->dqb_btime); 66 67 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); 68 empty.dqb_itime = __cpu_to_le64(1); 69 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) 70 m->dqb_itime = 0; 71} 72 73/* 74 * Copy dquot from memory to disk 75 */ 76static void v2r1_mem2diskdqblk(void *dp, struct dquot *dquot) 77{ 78 struct util_dqblk *m = &dquot->dq_dqb; 79 struct v2r1_disk_dqblk *d = dp; 80 81 d->dqb_ihardlimit = __cpu_to_le64(m->dqb_ihardlimit); 82 d->dqb_isoftlimit = __cpu_to_le64(m->dqb_isoftlimit); 83 d->dqb_bhardlimit = __cpu_to_le64(m->dqb_bhardlimit); 84 d->dqb_bsoftlimit = __cpu_to_le64(m->dqb_bsoftlimit); 85 d->dqb_curinodes = __cpu_to_le64(m->dqb_curinodes); 86 d->dqb_curspace = __cpu_to_le64(m->dqb_curspace); 87 d->dqb_itime = __cpu_to_le64(m->dqb_itime); 88 d->dqb_btime = __cpu_to_le64(m->dqb_btime); 89 d->dqb_id = __cpu_to_le32(dquot->dq_id); 90 if (qtree_entry_unused(&dquot->dq_h->qh_info.u.v2_mdqi.dqi_qtree, dp)) 91 d->dqb_itime = __cpu_to_le64(1); 92} 93 94static int v2r1_is_id(void *dp, struct dquot *dquot) 95{ 96 struct v2r1_disk_dqblk *d = dp; 97 struct qtree_mem_dqinfo *info = 98 &dquot->dq_h->qh_info.u.v2_mdqi.dqi_qtree; 99 100 if (qtree_entry_unused(info, dp)) 101 return 0; 102 return __le32_to_cpu(d->dqb_id) == dquot->dq_id; 103} 104 105static struct qtree_fmt_operations v2r1_fmt_ops = { 106 .mem2disk_dqblk = v2r1_mem2diskdqblk, 107 .disk2mem_dqblk = v2r1_disk2memdqblk, 108 .is_id = v2r1_is_id, 109}; 110 111/* 112 * Copy dqinfo from disk to memory 113 */ 114static inline void v2_disk2memdqinfo(struct util_dqinfo *m, 115 struct v2_disk_dqinfo *d) 116{ 117 m->dqi_bgrace = __le32_to_cpu(d->dqi_bgrace); 118 m->dqi_igrace = __le32_to_cpu(d->dqi_igrace); 119 m->u.v2_mdqi.dqi_flags = __le32_to_cpu(d->dqi_flags) & V2_DQF_MASK; 120 m->u.v2_mdqi.dqi_qtree.dqi_blocks = __le32_to_cpu(d->dqi_blocks); 121 m->u.v2_mdqi.dqi_qtree.dqi_free_blk = __le32_to_cpu(d->dqi_free_blk); 122 m->u.v2_mdqi.dqi_qtree.dqi_free_entry = 123 __le32_to_cpu(d->dqi_free_entry); 124} 125 126/* 127 * Copy dqinfo from memory to disk 128 */ 129static inline void v2_mem2diskdqinfo(struct v2_disk_dqinfo *d, 130 struct util_dqinfo *m) 131{ 132 d->dqi_bgrace = __cpu_to_le32(m->dqi_bgrace); 133 d->dqi_igrace = __cpu_to_le32(m->dqi_igrace); 134 d->dqi_flags = __cpu_to_le32(m->u.v2_mdqi.dqi_flags & V2_DQF_MASK); 135 d->dqi_blocks = __cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_blocks); 136 d->dqi_free_blk = __cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_free_blk); 137 d->dqi_free_entry = 138 __cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_free_entry); 139} 140 141/* Convert kernel quotablock format to utility one */ 142static inline void v2_kern2utildqblk(struct util_dqblk *u, 143 struct v2_kern_dqblk *k) 144{ 145 u->dqb_ihardlimit = k->dqb_ihardlimit; 146 u->dqb_isoftlimit = k->dqb_isoftlimit; 147 u->dqb_bhardlimit = k->dqb_bhardlimit; 148 u->dqb_bsoftlimit = k->dqb_bsoftlimit; 149 u->dqb_curinodes = k->dqb_curinodes; 150 u->dqb_curspace = k->dqb_curspace; 151 u->dqb_itime = k->dqb_itime; 152 u->dqb_btime = k->dqb_btime; 153} 154 155/* Convert utility quotablock format to kernel one */ 156static inline void v2_util2kerndqblk(struct v2_kern_dqblk *k, 157 struct util_dqblk *u) 158{ 159 k->dqb_ihardlimit = u->dqb_ihardlimit; 160 k->dqb_isoftlimit = u->dqb_isoftlimit; 161 k->dqb_bhardlimit = u->dqb_bhardlimit; 162 k->dqb_bsoftlimit = u->dqb_bsoftlimit; 163 k->dqb_curinodes = u->dqb_curinodes; 164 k->dqb_curspace = u->dqb_curspace; 165 k->dqb_itime = u->dqb_itime; 166 k->dqb_btime = u->dqb_btime; 167} 168 169static int v2_read_header(struct quota_handle *h, struct v2_disk_dqheader *dqh) 170{ 171 if (h->e2fs_read(&h->qh_qf, 0, dqh, sizeof(struct v2_disk_dqheader)) != 172 sizeof(struct v2_disk_dqheader)) 173 return 0; 174 175 return 1; 176} 177 178/* 179 * Check whether given quota file is in our format 180 */ 181static int v2_check_file(struct quota_handle *h, int type, int fmt) 182{ 183 struct v2_disk_dqheader dqh; 184 int file_magics[] = INITQMAGICS; 185 int known_versions[] = INIT_V2_VERSIONS; 186 int version; 187 188 if (!v2_read_header(h, &dqh)) 189 return 0; 190 if (fmt == QFMT_VFS_V0) 191 version = 0; 192 else if (fmt == QFMT_VFS_V1) 193 version = 1; 194 else 195 return 0; 196 197 if (__le32_to_cpu(dqh.dqh_magic) != file_magics[type]) { 198 if (__be32_to_cpu(dqh.dqh_magic) == file_magics[type]) 199 log_fatal(3, "Your quota file is stored in wrong " 200 "endianity.", ""); 201 return 0; 202 } 203 if (__le32_to_cpu(dqh.dqh_version) > known_versions[type]) 204 return 0; 205 if (version != __le32_to_cpu(dqh.dqh_version)) 206 return 0; 207 return 1; 208} 209 210/* 211 * Open quotafile 212 */ 213static int v2_init_io(struct quota_handle *h) 214{ 215 log_err("Not Implemented.", ""); 216 BUG_ON(1); 217 return 0; 218} 219 220/* 221 * Initialize new quotafile 222 */ 223static int v2_new_io(struct quota_handle *h) 224{ 225 int file_magics[] = INITQMAGICS; 226 struct v2_disk_dqheader ddqheader; 227 struct v2_disk_dqinfo ddqinfo; 228 int version = 1; 229 230 BUG_ON(h->qh_fmt != QFMT_VFS_V1); 231 232 /* Write basic quota header */ 233 ddqheader.dqh_magic = __cpu_to_le32(file_magics[h->qh_type]); 234 ddqheader.dqh_version = __cpu_to_le32(version); 235 if (h->e2fs_write(&h->qh_qf, 0, &ddqheader, sizeof(ddqheader)) != 236 sizeof(ddqheader)) 237 return -1; 238 239 /* Write information about quotafile */ 240 h->qh_info.dqi_bgrace = MAX_DQ_TIME; 241 h->qh_info.dqi_igrace = MAX_IQ_TIME; 242 h->qh_info.u.v2_mdqi.dqi_flags = 0; 243 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_blocks = QT_TREEOFF + 1; 244 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_free_blk = 0; 245 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_free_entry = 0; 246 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_entry_size = 247 sizeof(struct v2r1_disk_dqblk); 248 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_ops = &v2r1_fmt_ops; 249 v2_mem2diskdqinfo(&ddqinfo, &h->qh_info); 250 if (h->e2fs_write(&h->qh_qf, V2_DQINFOOFF, &ddqinfo, 251 sizeof(ddqinfo)) != 252 sizeof(ddqinfo)) 253 return -1; 254 255 return 0; 256} 257 258/* 259 * Write information (grace times to file) 260 */ 261static int v2_write_info(struct quota_handle *h) 262{ 263 struct v2_disk_dqinfo ddqinfo; 264 265 v2_mem2diskdqinfo(&ddqinfo, &h->qh_info); 266 if (h->e2fs_write(&h->qh_qf, V2_DQINFOOFF, &ddqinfo, sizeof(ddqinfo)) != 267 sizeof(ddqinfo)) 268 return -1; 269 270 return 0; 271} 272 273/* 274 * Read dquot (either from disk or from kernel) 275 * User can use errno to detect errstr when NULL is returned 276 */ 277static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id) 278{ 279 return qtree_read_dquot(h, id); 280} 281 282/* 283 * Commit changes of dquot to disk - it might also mean deleting it when quota 284 * became fake one and user has no blocks. 285 * User can process use 'errno' to detect errstr. 286 */ 287static int v2_commit_dquot(struct dquot *dquot, int flags) 288{ 289 struct util_dqblk *b = &dquot->dq_dqb; 290 291 if (!b->dqb_curspace && !b->dqb_curinodes && !b->dqb_bsoftlimit && 292 !b->dqb_isoftlimit && !b->dqb_bhardlimit && !b->dqb_ihardlimit) 293 qtree_delete_dquot(dquot); 294 else 295 qtree_write_dquot(dquot); 296 return 0; 297} 298 299static int v2_scan_dquots(struct quota_handle *h, 300 int (*process_dquot) (struct dquot *, char *)) 301{ 302 return qtree_scan_dquots(h, process_dquot); 303} 304 305/* Report information about quotafile. 306 * TODO: Not used right now, but we should be able to use this when we add 307 * support to debugfs to read quota files. 308 */ 309static int v2_report(struct quota_handle *h, int verbose) 310{ 311 log_err("Not Implemented.", ""); 312 BUG_ON(1); 313 return 0; 314} 315