1 /* 2 * vfsv0 quota IO operations on file 3 */ 4 5 #include <linux/errno.h> 6 #include <linux/fs.h> 7 #include <linux/mount.h> 8 #include <linux/dqblk_v2.h> 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/slab.h> 13 #include <linux/quotaops.h> 14 15 #include <asm/byteorder.h> 16 17 #include "quota_tree.h" 18 #include "quotaio_v2.h" 19 20 MODULE_AUTHOR("Jan Kara"); 21 MODULE_DESCRIPTION("Quota format v2 support"); 22 MODULE_LICENSE("GPL"); 23 24 #define __QUOTA_V2_PARANOIA 25 26 static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot); 27 static void v2r0_disk2memdqb(struct dquot *dquot, void *dp); 28 static int v2r0_is_id(void *dp, struct dquot *dquot); 29 static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot); 30 static void v2r1_disk2memdqb(struct dquot *dquot, void *dp); 31 static int v2r1_is_id(void *dp, struct dquot *dquot); 32 33 static struct qtree_fmt_operations v2r0_qtree_ops = { 34 .mem2disk_dqblk = v2r0_mem2diskdqb, 35 .disk2mem_dqblk = v2r0_disk2memdqb, 36 .is_id = v2r0_is_id, 37 }; 38 39 static struct qtree_fmt_operations v2r1_qtree_ops = { 40 .mem2disk_dqblk = v2r1_mem2diskdqb, 41 .disk2mem_dqblk = v2r1_disk2memdqb, 42 .is_id = v2r1_is_id, 43 }; 44 45 #define QUOTABLOCK_BITS 10 46 #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) 47 48 static inline qsize_t v2_stoqb(qsize_t space) 49 { 50 return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS; 51 } 52 53 static inline qsize_t v2_qbtos(qsize_t blocks) 54 { 55 return blocks << QUOTABLOCK_BITS; 56 } 57 58 static int v2_read_header(struct super_block *sb, int type, 59 struct v2_disk_dqheader *dqhead) 60 { 61 ssize_t size; 62 63 size = sb->s_op->quota_read(sb, type, (char *)dqhead, 64 sizeof(struct v2_disk_dqheader), 0); 65 if (size != sizeof(struct v2_disk_dqheader)) { 66 quota_error(sb, "Failed header read: expected=%zd got=%zd", 67 sizeof(struct v2_disk_dqheader), size); 68 return 0; 69 } 70 return 1; 71 } 72 73 /* Check whether given file is really vfsv0 quotafile */ 74 static int v2_check_quota_file(struct super_block *sb, int type) 75 { 76 struct v2_disk_dqheader dqhead; 77 static const uint quota_magics[] = V2_INITQMAGICS; 78 static const uint quota_versions[] = V2_INITQVERSIONS; 79 80 if (!v2_read_header(sb, type, &dqhead)) 81 return 0; 82 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || 83 le32_to_cpu(dqhead.dqh_version) > quota_versions[type]) 84 return 0; 85 return 1; 86 } 87 88 /* Read information header from quota file */ 89 static int v2_read_file_info(struct super_block *sb, int type) 90 { 91 struct v2_disk_dqinfo dinfo; 92 struct v2_disk_dqheader dqhead; 93 struct mem_dqinfo *info = sb_dqinfo(sb, type); 94 struct qtree_mem_dqinfo *qinfo; 95 ssize_t size; 96 unsigned int version; 97 98 if (!v2_read_header(sb, type, &dqhead)) 99 return -1; 100 version = le32_to_cpu(dqhead.dqh_version); 101 if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) || 102 (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) 103 return -1; 104 105 size = sb->s_op->quota_read(sb, type, (char *)&dinfo, 106 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); 107 if (size != sizeof(struct v2_disk_dqinfo)) { 108 quota_error(sb, "Can't read info structure"); 109 return -1; 110 } 111 info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); 112 if (!info->dqi_priv) { 113 printk(KERN_WARNING 114 "Not enough memory for quota information structure.\n"); 115 return -ENOMEM; 116 } 117 qinfo = info->dqi_priv; 118 if (version == 0) { 119 /* limits are stored as unsigned 32-bit data */ 120 info->dqi_max_spc_limit = 0xffffffffULL << QUOTABLOCK_BITS; 121 info->dqi_max_ino_limit = 0xffffffff; 122 } else { 123 /* used space is stored as unsigned 64-bit value in bytes */ 124 info->dqi_max_spc_limit = 0xffffffffffffffffULL; /* 2^64-1 */ 125 info->dqi_max_ino_limit = 0xffffffffffffffffULL; 126 } 127 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 128 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 129 /* No flags currently supported */ 130 info->dqi_flags = 0; 131 qinfo->dqi_sb = sb; 132 qinfo->dqi_type = type; 133 qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 134 qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 135 qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 136 qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; 137 qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; 138 qinfo->dqi_qtree_depth = qtree_depth(qinfo); 139 if (version == 0) { 140 qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk); 141 qinfo->dqi_ops = &v2r0_qtree_ops; 142 } else { 143 qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk); 144 qinfo->dqi_ops = &v2r1_qtree_ops; 145 } 146 return 0; 147 } 148 149 /* Write information header to quota file */ 150 static int v2_write_file_info(struct super_block *sb, int type) 151 { 152 struct v2_disk_dqinfo dinfo; 153 struct mem_dqinfo *info = sb_dqinfo(sb, type); 154 struct qtree_mem_dqinfo *qinfo = info->dqi_priv; 155 ssize_t size; 156 157 spin_lock(&dq_data_lock); 158 info->dqi_flags &= ~DQF_INFO_DIRTY; 159 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 160 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 161 /* No flags currently supported */ 162 dinfo.dqi_flags = cpu_to_le32(0); 163 spin_unlock(&dq_data_lock); 164 dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks); 165 dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk); 166 dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry); 167 size = sb->s_op->quota_write(sb, type, (char *)&dinfo, 168 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); 169 if (size != sizeof(struct v2_disk_dqinfo)) { 170 quota_error(sb, "Can't write info structure"); 171 return -1; 172 } 173 return 0; 174 } 175 176 static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) 177 { 178 struct v2r0_disk_dqblk *d = dp, empty; 179 struct mem_dqblk *m = &dquot->dq_dqb; 180 181 m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); 182 m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); 183 m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); 184 m->dqb_itime = le64_to_cpu(d->dqb_itime); 185 m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); 186 m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); 187 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 188 m->dqb_btime = le64_to_cpu(d->dqb_btime); 189 /* We need to escape back all-zero structure */ 190 memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); 191 empty.dqb_itime = cpu_to_le64(1); 192 if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) 193 m->dqb_itime = 0; 194 } 195 196 static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) 197 { 198 struct v2r0_disk_dqblk *d = dp; 199 struct mem_dqblk *m = &dquot->dq_dqb; 200 struct qtree_mem_dqinfo *info = 201 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 202 203 d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); 204 d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); 205 d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); 206 d->dqb_itime = cpu_to_le64(m->dqb_itime); 207 d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); 208 d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); 209 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 210 d->dqb_btime = cpu_to_le64(m->dqb_btime); 211 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); 212 if (qtree_entry_unused(info, dp)) 213 d->dqb_itime = cpu_to_le64(1); 214 } 215 216 static int v2r0_is_id(void *dp, struct dquot *dquot) 217 { 218 struct v2r0_disk_dqblk *d = dp; 219 struct qtree_mem_dqinfo *info = 220 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 221 222 if (qtree_entry_unused(info, dp)) 223 return 0; 224 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, 225 le32_to_cpu(d->dqb_id)), 226 dquot->dq_id); 227 } 228 229 static void v2r1_disk2memdqb(struct dquot *dquot, void *dp) 230 { 231 struct v2r1_disk_dqblk *d = dp, empty; 232 struct mem_dqblk *m = &dquot->dq_dqb; 233 234 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); 235 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); 236 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); 237 m->dqb_itime = le64_to_cpu(d->dqb_itime); 238 m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit)); 239 m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit)); 240 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 241 m->dqb_btime = le64_to_cpu(d->dqb_btime); 242 /* We need to escape back all-zero structure */ 243 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); 244 empty.dqb_itime = cpu_to_le64(1); 245 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) 246 m->dqb_itime = 0; 247 } 248 249 static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot) 250 { 251 struct v2r1_disk_dqblk *d = dp; 252 struct mem_dqblk *m = &dquot->dq_dqb; 253 struct qtree_mem_dqinfo *info = 254 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 255 256 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); 257 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); 258 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); 259 d->dqb_itime = cpu_to_le64(m->dqb_itime); 260 d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit)); 261 d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit)); 262 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 263 d->dqb_btime = cpu_to_le64(m->dqb_btime); 264 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); 265 if (qtree_entry_unused(info, dp)) 266 d->dqb_itime = cpu_to_le64(1); 267 } 268 269 static int v2r1_is_id(void *dp, struct dquot *dquot) 270 { 271 struct v2r1_disk_dqblk *d = dp; 272 struct qtree_mem_dqinfo *info = 273 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 274 275 if (qtree_entry_unused(info, dp)) 276 return 0; 277 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, 278 le32_to_cpu(d->dqb_id)), 279 dquot->dq_id); 280 } 281 282 static int v2_read_dquot(struct dquot *dquot) 283 { 284 return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); 285 } 286 287 static int v2_write_dquot(struct dquot *dquot) 288 { 289 return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); 290 } 291 292 static int v2_release_dquot(struct dquot *dquot) 293 { 294 return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); 295 } 296 297 static int v2_free_file_info(struct super_block *sb, int type) 298 { 299 kfree(sb_dqinfo(sb, type)->dqi_priv); 300 return 0; 301 } 302 303 static const struct quota_format_ops v2_format_ops = { 304 .check_quota_file = v2_check_quota_file, 305 .read_file_info = v2_read_file_info, 306 .write_file_info = v2_write_file_info, 307 .free_file_info = v2_free_file_info, 308 .read_dqblk = v2_read_dquot, 309 .commit_dqblk = v2_write_dquot, 310 .release_dqblk = v2_release_dquot, 311 }; 312 313 static struct quota_format_type v2r0_quota_format = { 314 .qf_fmt_id = QFMT_VFS_V0, 315 .qf_ops = &v2_format_ops, 316 .qf_owner = THIS_MODULE 317 }; 318 319 static struct quota_format_type v2r1_quota_format = { 320 .qf_fmt_id = QFMT_VFS_V1, 321 .qf_ops = &v2_format_ops, 322 .qf_owner = THIS_MODULE 323 }; 324 325 static int __init init_v2_quota_format(void) 326 { 327 int ret; 328 329 ret = register_quota_format(&v2r0_quota_format); 330 if (ret) 331 return ret; 332 return register_quota_format(&v2r1_quota_format); 333 } 334 335 static void __exit exit_v2_quota_format(void) 336 { 337 unregister_quota_format(&v2r0_quota_format); 338 unregister_quota_format(&v2r1_quota_format); 339 } 340 341 module_init(init_v2_quota_format); 342 module_exit(exit_v2_quota_format); 343