lib/quota/quotaio_v2.c

   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
  21 static int v2_check_file(struct quota_handle *h, int type, int fmt);
  22 static int v2_init_io(struct quota_handle *h);
  23 static int v2_new_io(struct quota_handle *h);
  24 static int v2_write_info(struct quota_handle *h);
  25 static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id);
  26 static int v2_commit_dquot(struct dquot *dquot);
  27 static int v2_scan_dquots(struct quota_handle *h,
  28                           int (*process_dquot) (struct dquot *dquot,
  29                                                 void *data),
  30                           void *data);
  31 static int v2_report(struct quota_handle *h, int verbose);
  32
  33 struct 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  */
  47 static 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  */
  71 static 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
  89 static 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
 100 static 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  */
 109 static 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  */
 125 static 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
 138 static 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  */
 150 static 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  */
 174 static 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  */
 193 static 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  */
 231 static 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  */
 246 static 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  */
 256 static 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
 268 static 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  */
 279 static int v2_report(struct quota_handle *h, int verbose)
 280 {
 281         log_err("Not Implemented.");
 282         return -1;
 283 }