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_maxblimit = 0xffffffff; 121 info->dqi_maxilimit = 0xffffffff; 122 } else { 123 /* used space is stored as unsigned 64-bit value */ 124 info->dqi_maxblimit = 0xffffffffffffffffULL; /* 2^64-1 */ 125 info->dqi_maxilimit = 0xffffffffffffffffULL; 126 } 127 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 128 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 129 info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); 130 qinfo->dqi_sb = sb; 131 qinfo->dqi_type = type; 132 qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 133 qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 134 qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 135 qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; 136 qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; 137 qinfo->dqi_qtree_depth = qtree_depth(qinfo); 138 if (version == 0) { 139 qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk); 140 qinfo->dqi_ops = &v2r0_qtree_ops; 141 } else { 142 qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk); 143 qinfo->dqi_ops = &v2r1_qtree_ops; 144 } 145 return 0; 146 } 147 148 /* Write information header to quota file */ 149 static int v2_write_file_info(struct super_block *sb, int type) 150 { 151 struct v2_disk_dqinfo dinfo; 152 struct mem_dqinfo *info = sb_dqinfo(sb, type); 153 struct qtree_mem_dqinfo *qinfo = info->dqi_priv; 154 ssize_t size; 155 156 spin_lock(&dq_data_lock); 157 info->dqi_flags &= ~DQF_INFO_DIRTY; 158 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 159 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 160 dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); 161 spin_unlock(&dq_data_lock); 162 dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks); 163 dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk); 164 dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry); 165 size = sb->s_op->quota_write(sb, type, (char *)&dinfo, 166 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); 167 if (size != sizeof(struct v2_disk_dqinfo)) { 168 quota_error(sb, "Can't write info structure"); 169 return -1; 170 } 171 return 0; 172 } 173 174 static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) 175 { 176 struct v2r0_disk_dqblk *d = dp, empty; 177 struct mem_dqblk *m = &dquot->dq_dqb; 178 179 m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); 180 m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); 181 m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); 182 m->dqb_itime = le64_to_cpu(d->dqb_itime); 183 m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); 184 m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); 185 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 186 m->dqb_btime = le64_to_cpu(d->dqb_btime); 187 /* We need to escape back all-zero structure */ 188 memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); 189 empty.dqb_itime = cpu_to_le64(1); 190 if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) 191 m->dqb_itime = 0; 192 } 193 194 static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) 195 { 196 struct v2r0_disk_dqblk *d = dp; 197 struct mem_dqblk *m = &dquot->dq_dqb; 198 struct qtree_mem_dqinfo *info = 199 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 200 201 d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); 202 d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); 203 d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); 204 d->dqb_itime = cpu_to_le64(m->dqb_itime); 205 d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); 206 d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); 207 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 208 d->dqb_btime = cpu_to_le64(m->dqb_btime); 209 d->dqb_id = cpu_to_le32(dquot->dq_id); 210 if (qtree_entry_unused(info, dp)) 211 d->dqb_itime = cpu_to_le64(1); 212 } 213 214 static int v2r0_is_id(void *dp, struct dquot *dquot) 215 { 216 struct v2r0_disk_dqblk *d = dp; 217 struct qtree_mem_dqinfo *info = 218 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 219 220 if (qtree_entry_unused(info, dp)) 221 return 0; 222 return le32_to_cpu(d->dqb_id) == dquot->dq_id; 223 } 224 225 static void v2r1_disk2memdqb(struct dquot *dquot, void *dp) 226 { 227 struct v2r1_disk_dqblk *d = dp, empty; 228 struct mem_dqblk *m = &dquot->dq_dqb; 229 230 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); 231 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); 232 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); 233 m->dqb_itime = le64_to_cpu(d->dqb_itime); 234 m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit)); 235 m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit)); 236 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 237 m->dqb_btime = le64_to_cpu(d->dqb_btime); 238 /* We need to escape back all-zero structure */ 239 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); 240 empty.dqb_itime = cpu_to_le64(1); 241 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) 242 m->dqb_itime = 0; 243 } 244 245 static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot) 246 { 247 struct v2r1_disk_dqblk *d = dp; 248 struct mem_dqblk *m = &dquot->dq_dqb; 249 struct qtree_mem_dqinfo *info = 250 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 251 252 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); 253 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); 254 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); 255 d->dqb_itime = cpu_to_le64(m->dqb_itime); 256 d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit)); 257 d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit)); 258 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 259 d->dqb_btime = cpu_to_le64(m->dqb_btime); 260 d->dqb_id = cpu_to_le32(dquot->dq_id); 261 if (qtree_entry_unused(info, dp)) 262 d->dqb_itime = cpu_to_le64(1); 263 } 264 265 static int v2r1_is_id(void *dp, struct dquot *dquot) 266 { 267 struct v2r1_disk_dqblk *d = dp; 268 struct qtree_mem_dqinfo *info = 269 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 270 271 if (qtree_entry_unused(info, dp)) 272 return 0; 273 return le32_to_cpu(d->dqb_id) == dquot->dq_id; 274 } 275 276 static int v2_read_dquot(struct dquot *dquot) 277 { 278 return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); 279 } 280 281 static int v2_write_dquot(struct dquot *dquot) 282 { 283 return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); 284 } 285 286 static int v2_release_dquot(struct dquot *dquot) 287 { 288 return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); 289 } 290 291 static int v2_free_file_info(struct super_block *sb, int type) 292 { 293 kfree(sb_dqinfo(sb, type)->dqi_priv); 294 return 0; 295 } 296 297 static const struct quota_format_ops v2_format_ops = { 298 .check_quota_file = v2_check_quota_file, 299 .read_file_info = v2_read_file_info, 300 .write_file_info = v2_write_file_info, 301 .free_file_info = v2_free_file_info, 302 .read_dqblk = v2_read_dquot, 303 .commit_dqblk = v2_write_dquot, 304 .release_dqblk = v2_release_dquot, 305 }; 306 307 static struct quota_format_type v2r0_quota_format = { 308 .qf_fmt_id = QFMT_VFS_V0, 309 .qf_ops = &v2_format_ops, 310 .qf_owner = THIS_MODULE 311 }; 312 313 static struct quota_format_type v2r1_quota_format = { 314 .qf_fmt_id = QFMT_VFS_V1, 315 .qf_ops = &v2_format_ops, 316 .qf_owner = THIS_MODULE 317 }; 318 319 static int __init init_v2_quota_format(void) 320 { 321 int ret; 322 323 ret = register_quota_format(&v2r0_quota_format); 324 if (ret) 325 return ret; 326 return register_quota_format(&v2r1_quota_format); 327 } 328 329 static void __exit exit_v2_quota_format(void) 330 { 331 unregister_quota_format(&v2r0_quota_format); 332 unregister_quota_format(&v2r1_quota_format); 333 } 334 335 module_init(init_v2_quota_format); 336 module_exit(exit_v2_quota_format); 337