quotaio_v2.c revision 0ce0172984c807d3366e8db6e2a2b6ecae314832
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 15#include "common.h" 16#include "quotaio_v2.h" 17#include "dqblk_v2.h" 18#include "quotaio.h" 19#include "quotaio_tree.h" 20 21static int v2_check_file(struct quota_handle *h, int type, int fmt); 22static int v2_init_io(struct quota_handle *h); 23static int v2_new_io(struct quota_handle *h); 24static int v2_write_info(struct quota_handle *h); 25static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id); 26static int v2_commit_dquot(struct dquot *dquot); 27static int v2_scan_dquots(struct quota_handle *h, 28 int (*process_dquot) (struct dquot *dquot, 29 void *data), 30 void *data); 31static int v2_report(struct quota_handle *h, int verbose); 32 33struct quotafile_ops quotafile_ops_2 = { 34 .check_file = v2_check_file, 35 .init_io = v2_init_io, 36 .new_io = v2_new_io, 37 .write_info = v2_write_info, 38 .read_dquot = v2_read_dquot, 39 .commit_dquot = v2_commit_dquot, 40 .scan_dquots = v2_scan_dquots, 41 .report = v2_report, 42}; 43 44/* 45 * Copy dquot from disk to memory 46 */ 47static void v2r1_disk2memdqblk(struct dquot *dquot, void *dp) 48{ 49 struct util_dqblk *m = &dquot->dq_dqb; 50 struct v2r1_disk_dqblk *d = dp, empty; 51 52 dquot->dq_id = ext2fs_le32_to_cpu(d->dqb_id); 53 m->dqb_ihardlimit = ext2fs_le64_to_cpu(d->dqb_ihardlimit); 54 m->dqb_isoftlimit = ext2fs_le64_to_cpu(d->dqb_isoftlimit); 55 m->dqb_bhardlimit = ext2fs_le64_to_cpu(d->dqb_bhardlimit); 56 m->dqb_bsoftlimit = ext2fs_le64_to_cpu(d->dqb_bsoftlimit); 57 m->dqb_curinodes = ext2fs_le64_to_cpu(d->dqb_curinodes); 58 m->dqb_curspace = ext2fs_le64_to_cpu(d->dqb_curspace); 59 m->dqb_itime = ext2fs_le64_to_cpu(d->dqb_itime); 60 m->dqb_btime = ext2fs_le64_to_cpu(d->dqb_btime); 61 62 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); 63 empty.dqb_itime = ext2fs_cpu_to_le64(1); 64 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) 65 m->dqb_itime = 0; 66} 67 68/* 69 * Copy dquot from memory to disk 70 */ 71static void v2r1_mem2diskdqblk(void *dp, struct dquot *dquot) 72{ 73 struct util_dqblk *m = &dquot->dq_dqb; 74 struct v2r1_disk_dqblk *d = dp; 75 76 d->dqb_ihardlimit = ext2fs_cpu_to_le64(m->dqb_ihardlimit); 77 d->dqb_isoftlimit = ext2fs_cpu_to_le64(m->dqb_isoftlimit); 78 d->dqb_bhardlimit = ext2fs_cpu_to_le64(m->dqb_bhardlimit); 79 d->dqb_bsoftlimit = ext2fs_cpu_to_le64(m->dqb_bsoftlimit); 80 d->dqb_curinodes = ext2fs_cpu_to_le64(m->dqb_curinodes); 81 d->dqb_curspace = ext2fs_cpu_to_le64(m->dqb_curspace); 82 d->dqb_itime = ext2fs_cpu_to_le64(m->dqb_itime); 83 d->dqb_btime = ext2fs_cpu_to_le64(m->dqb_btime); 84 d->dqb_id = ext2fs_cpu_to_le32(dquot->dq_id); 85 if (qtree_entry_unused(&dquot->dq_h->qh_info.u.v2_mdqi.dqi_qtree, dp)) 86 d->dqb_itime = ext2fs_cpu_to_le64(1); 87} 88 89static int v2r1_is_id(void *dp, struct dquot *dquot) 90{ 91 struct v2r1_disk_dqblk *d = dp; 92 struct qtree_mem_dqinfo *info = 93 &dquot->dq_h->qh_info.u.v2_mdqi.dqi_qtree; 94 95 if (qtree_entry_unused(info, dp)) 96 return 0; 97 return ext2fs_le32_to_cpu(d->dqb_id) == dquot->dq_id; 98} 99 100static struct qtree_fmt_operations v2r1_fmt_ops = { 101 .mem2disk_dqblk = v2r1_mem2diskdqblk, 102 .disk2mem_dqblk = v2r1_disk2memdqblk, 103 .is_id = v2r1_is_id, 104}; 105 106/* 107 * Copy dqinfo from disk to memory 108 */ 109static inline void v2_disk2memdqinfo(struct util_dqinfo *m, 110 struct v2_disk_dqinfo *d) 111{ 112 m->dqi_bgrace = ext2fs_le32_to_cpu(d->dqi_bgrace); 113 m->dqi_igrace = ext2fs_le32_to_cpu(d->dqi_igrace); 114 m->u.v2_mdqi.dqi_flags = ext2fs_le32_to_cpu(d->dqi_flags) & V2_DQF_MASK; 115 m->u.v2_mdqi.dqi_qtree.dqi_blocks = ext2fs_le32_to_cpu(d->dqi_blocks); 116 m->u.v2_mdqi.dqi_qtree.dqi_free_blk = 117 ext2fs_le32_to_cpu(d->dqi_free_blk); 118 m->u.v2_mdqi.dqi_qtree.dqi_free_entry = 119 ext2fs_le32_to_cpu(d->dqi_free_entry); 120} 121 122/* 123 * Copy dqinfo from memory to disk 124 */ 125static inline void v2_mem2diskdqinfo(struct v2_disk_dqinfo *d, 126 struct util_dqinfo *m) 127{ 128 d->dqi_bgrace = ext2fs_cpu_to_le32(m->dqi_bgrace); 129 d->dqi_igrace = ext2fs_cpu_to_le32(m->dqi_igrace); 130 d->dqi_flags = ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_flags & V2_DQF_MASK); 131 d->dqi_blocks = ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_blocks); 132 d->dqi_free_blk = 133 ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_free_blk); 134 d->dqi_free_entry = 135 ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_free_entry); 136} 137 138static int v2_read_header(struct quota_handle *h, struct v2_disk_dqheader *dqh) 139{ 140 if (h->e2fs_read(&h->qh_qf, 0, dqh, sizeof(struct v2_disk_dqheader)) != 141 sizeof(struct v2_disk_dqheader)) 142 return 0; 143 144 return 1; 145} 146 147/* 148 * Check whether given quota file is in our format 149 */ 150static int v2_check_file(struct quota_handle *h, int type, int fmt) 151{ 152 struct v2_disk_dqheader dqh; 153 int file_magics[] = INITQMAGICS; 154 155 if (fmt != QFMT_VFS_V1) 156 return 0; 157 158 if (!v2_read_header(h, &dqh)) 159 return 0; 160 161 if (ext2fs_le32_to_cpu(dqh.dqh_magic) != file_magics[type]) { 162 if (ext2fs_be32_to_cpu(dqh.dqh_magic) == file_magics[type]) 163 log_err("Your quota file is stored in wrong endianity"); 164 return 0; 165 } 166 if (V2_VERSION != ext2fs_le32_to_cpu(dqh.dqh_version)) 167 return 0; 168 return 1; 169} 170 171/* 172 * Open quotafile 173 */ 174static int v2_init_io(struct quota_handle *h) 175{ 176 struct v2_disk_dqinfo ddqinfo; 177 178 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_entry_size = 179 sizeof(struct v2r1_disk_dqblk); 180 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_ops = &v2r1_fmt_ops; 181 182 /* Read information about quotafile */ 183 if (h->e2fs_read(&h->qh_qf, V2_DQINFOOFF, &ddqinfo, 184 sizeof(ddqinfo)) != sizeof(ddqinfo)) 185 return -1; 186 v2_disk2memdqinfo(&h->qh_info, &ddqinfo); 187 return 0; 188} 189 190/* 191 * Initialize new quotafile 192 */ 193static int v2_new_io(struct quota_handle *h) 194{ 195 int file_magics[] = INITQMAGICS; 196 struct v2_disk_dqheader ddqheader; 197 struct v2_disk_dqinfo ddqinfo; 198 199 if (h->qh_fmt != QFMT_VFS_V1) 200 return -1; 201 202 /* Write basic quota header */ 203 ddqheader.dqh_magic = ext2fs_cpu_to_le32(file_magics[h->qh_type]); 204 ddqheader.dqh_version = ext2fs_cpu_to_le32(V2_VERSION); 205 if (h->e2fs_write(&h->qh_qf, 0, &ddqheader, sizeof(ddqheader)) != 206 sizeof(ddqheader)) 207 return -1; 208 209 /* Write information about quotafile */ 210 h->qh_info.dqi_bgrace = MAX_DQ_TIME; 211 h->qh_info.dqi_igrace = MAX_IQ_TIME; 212 h->qh_info.u.v2_mdqi.dqi_flags = 0; 213 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_blocks = QT_TREEOFF + 1; 214 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_free_blk = 0; 215 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_free_entry = 0; 216 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_entry_size = 217 sizeof(struct v2r1_disk_dqblk); 218 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_ops = &v2r1_fmt_ops; 219 v2_mem2diskdqinfo(&ddqinfo, &h->qh_info); 220 if (h->e2fs_write(&h->qh_qf, V2_DQINFOOFF, &ddqinfo, 221 sizeof(ddqinfo)) != 222 sizeof(ddqinfo)) 223 return -1; 224 225 return 0; 226} 227 228/* 229 * Write information (grace times to file) 230 */ 231static int v2_write_info(struct quota_handle *h) 232{ 233 struct v2_disk_dqinfo ddqinfo; 234 235 v2_mem2diskdqinfo(&ddqinfo, &h->qh_info); 236 if (h->e2fs_write(&h->qh_qf, V2_DQINFOOFF, &ddqinfo, sizeof(ddqinfo)) != 237 sizeof(ddqinfo)) 238 return -1; 239 240 return 0; 241} 242 243/* 244 * Read dquot from disk 245 */ 246static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id) 247{ 248 return qtree_read_dquot(h, id); 249} 250 251/* 252 * Commit changes of dquot to disk - it might also mean deleting it when quota 253 * became fake one and user has no blocks. 254 * User can process use 'errno' to detect errstr. 255 */ 256static int v2_commit_dquot(struct dquot *dquot) 257{ 258 struct util_dqblk *b = &dquot->dq_dqb; 259 260 if (!b->dqb_curspace && !b->dqb_curinodes && !b->dqb_bsoftlimit && 261 !b->dqb_isoftlimit && !b->dqb_bhardlimit && !b->dqb_ihardlimit) 262 qtree_delete_dquot(dquot); 263 else 264 qtree_write_dquot(dquot); 265 return 0; 266} 267 268static int v2_scan_dquots(struct quota_handle *h, 269 int (*process_dquot) (struct dquot *, void *), 270 void *data) 271{ 272 return qtree_scan_dquots(h, process_dquot, data); 273} 274 275/* Report information about quotafile. 276 * TODO: Not used right now, but we should be able to use this when we add 277 * support to debugfs to read quota files. 278 */ 279static int v2_report(struct quota_handle *h, int verbose) 280{ 281 log_err("Not Implemented."); 282 return -1; 283} 284