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 q_warn(KERN_WARNING "quota_v2: Failed header read:" 67 " expected=%zd got=%zd\n", 68 sizeof(struct v2_disk_dqheader), size); 69 return 0; 70 } 71 return 1; 72 } 73 74 /* Check whether given file is really vfsv0 quotafile */ 75 static int v2_check_quota_file(struct super_block *sb, int type) 76 { 77 struct v2_disk_dqheader dqhead; 78 static const uint quota_magics[] = V2_INITQMAGICS; 79 static const uint quota_versions[] = V2_INITQVERSIONS; 80 81 if (!v2_read_header(sb, type, &dqhead)) 82 return 0; 83 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || 84 le32_to_cpu(dqhead.dqh_version) > quota_versions[type]) 85 return 0; 86 return 1; 87 } 88 89 /* Read information header from quota file */ 90 static int v2_read_file_info(struct super_block *sb, int type) 91 { 92 struct v2_disk_dqinfo dinfo; 93 struct v2_disk_dqheader dqhead; 94 struct mem_dqinfo *info = sb_dqinfo(sb, type); 95 struct qtree_mem_dqinfo *qinfo; 96 ssize_t size; 97 unsigned int version; 98 99 if (!v2_read_header(sb, type, &dqhead)) 100 return -1; 101 version = le32_to_cpu(dqhead.dqh_version); 102 if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) || 103 (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) 104 return -1; 105 106 size = sb->s_op->quota_read(sb, type, (char *)&dinfo, 107 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); 108 if (size != sizeof(struct v2_disk_dqinfo)) { 109 q_warn(KERN_WARNING "quota_v2: Can't read info structure on device %s.\n", 110 sb->s_id); 111 return -1; 112 } 113 info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); 114 if (!info->dqi_priv) { 115 printk(KERN_WARNING 116 "Not enough memory for quota information structure.\n"); 117 return -1; 118 } 119 qinfo = info->dqi_priv; 120 if (version == 0) { 121 /* limits are stored as unsigned 32-bit data */ 122 info->dqi_maxblimit = 0xffffffff; 123 info->dqi_maxilimit = 0xffffffff; 124 } else { 125 /* used space is stored as unsigned 64-bit value */ 126 info->dqi_maxblimit = 0xffffffffffffffffULL; /* 2^64-1 */ 127 info->dqi_maxilimit = 0xffffffffffffffffULL; 128 } 129 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 130 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 131 info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); 132 qinfo->dqi_sb = sb; 133 qinfo->dqi_type = type; 134 qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 135 qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 136 qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 137 qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; 138 qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; 139 qinfo->dqi_qtree_depth = qtree_depth(qinfo); 140 if (version == 0) { 141 qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk); 142 qinfo->dqi_ops = &v2r0_qtree_ops; 143 } else { 144 qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk); 145 qinfo->dqi_ops = &v2r1_qtree_ops; 146 } 147 return 0; 148 } 149 150 /* Write information header to quota file */ 151 static int v2_write_file_info(struct super_block *sb, int type) 152 { 153 struct v2_disk_dqinfo dinfo; 154 struct mem_dqinfo *info = sb_dqinfo(sb, type); 155 struct qtree_mem_dqinfo *qinfo = info->dqi_priv; 156 ssize_t size; 157 158 spin_lock(&dq_data_lock); 159 info->dqi_flags &= ~DQF_INFO_DIRTY; 160 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 161 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 162 dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); 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 q_warn(KERN_WARNING "Can't write info structure on device %s.\n", 171 sb->s_id); 172 return -1; 173 } 174 return 0; 175 } 176 177 static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) 178 { 179 struct v2r0_disk_dqblk *d = dp, empty; 180 struct mem_dqblk *m = &dquot->dq_dqb; 181 182 m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); 183 m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); 184 m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); 185 m->dqb_itime = le64_to_cpu(d->dqb_itime); 186 m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); 187 m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); 188 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 189 m->dqb_btime = le64_to_cpu(d->dqb_btime); 190 /* We need to escape back all-zero structure */ 191 memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); 192 empty.dqb_itime = cpu_to_le64(1); 193 if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) 194 m->dqb_itime = 0; 195 } 196 197 static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) 198 { 199 struct v2r0_disk_dqblk *d = dp; 200 struct mem_dqblk *m = &dquot->dq_dqb; 201 struct qtree_mem_dqinfo *info = 202 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 203 204 d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); 205 d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); 206 d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); 207 d->dqb_itime = cpu_to_le64(m->dqb_itime); 208 d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); 209 d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); 210 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 211 d->dqb_btime = cpu_to_le64(m->dqb_btime); 212 d->dqb_id = cpu_to_le32(dquot->dq_id); 213 if (qtree_entry_unused(info, dp)) 214 d->dqb_itime = cpu_to_le64(1); 215 } 216 217 static int v2r0_is_id(void *dp, struct dquot *dquot) 218 { 219 struct v2r0_disk_dqblk *d = dp; 220 struct qtree_mem_dqinfo *info = 221 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 222 223 if (qtree_entry_unused(info, dp)) 224 return 0; 225 return le32_to_cpu(d->dqb_id) == dquot->dq_id; 226 } 227 228 static void v2r1_disk2memdqb(struct dquot *dquot, void *dp) 229 { 230 struct v2r1_disk_dqblk *d = dp, empty; 231 struct mem_dqblk *m = &dquot->dq_dqb; 232 233 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); 234 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); 235 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); 236 m->dqb_itime = le64_to_cpu(d->dqb_itime); 237 m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit)); 238 m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit)); 239 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 240 m->dqb_btime = le64_to_cpu(d->dqb_btime); 241 /* We need to escape back all-zero structure */ 242 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); 243 empty.dqb_itime = cpu_to_le64(1); 244 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) 245 m->dqb_itime = 0; 246 } 247 248 static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot) 249 { 250 struct v2r1_disk_dqblk *d = dp; 251 struct mem_dqblk *m = &dquot->dq_dqb; 252 struct qtree_mem_dqinfo *info = 253 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 254 255 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); 256 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); 257 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); 258 d->dqb_itime = cpu_to_le64(m->dqb_itime); 259 d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit)); 260 d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit)); 261 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 262 d->dqb_btime = cpu_to_le64(m->dqb_btime); 263 d->dqb_id = cpu_to_le32(dquot->dq_id); 264 if (qtree_entry_unused(info, dp)) 265 d->dqb_itime = cpu_to_le64(1); 266 } 267 268 static int v2r1_is_id(void *dp, struct dquot *dquot) 269 { 270 struct v2r1_disk_dqblk *d = dp; 271 struct qtree_mem_dqinfo *info = 272 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 273 274 if (qtree_entry_unused(info, dp)) 275 return 0; 276 return le32_to_cpu(d->dqb_id) == dquot->dq_id; 277 } 278 279 static int v2_read_dquot(struct dquot *dquot) 280 { 281 return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); 282 } 283 284 static int v2_write_dquot(struct dquot *dquot) 285 { 286 return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); 287 } 288 289 static int v2_release_dquot(struct dquot *dquot) 290 { 291 return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); 292 } 293 294 static int v2_free_file_info(struct super_block *sb, int type) 295 { 296 kfree(sb_dqinfo(sb, type)->dqi_priv); 297 return 0; 298 } 299 300 static const struct quota_format_ops v2_format_ops = { 301 .check_quota_file = v2_check_quota_file, 302 .read_file_info = v2_read_file_info, 303 .write_file_info = v2_write_file_info, 304 .free_file_info = v2_free_file_info, 305 .read_dqblk = v2_read_dquot, 306 .commit_dqblk = v2_write_dquot, 307 .release_dqblk = v2_release_dquot, 308 }; 309 310 static struct quota_format_type v2r0_quota_format = { 311 .qf_fmt_id = QFMT_VFS_V0, 312 .qf_ops = &v2_format_ops, 313 .qf_owner = THIS_MODULE 314 }; 315 316 static struct quota_format_type v2r1_quota_format = { 317 .qf_fmt_id = QFMT_VFS_V1, 318 .qf_ops = &v2_format_ops, 319 .qf_owner = THIS_MODULE 320 }; 321 322 static int __init init_v2_quota_format(void) 323 { 324 int ret; 325 326 ret = register_quota_format(&v2r0_quota_format); 327 if (ret) 328 return ret; 329 return register_quota_format(&v2r1_quota_format); 330 } 331 332 static void __exit exit_v2_quota_format(void) 333 { 334 unregister_quota_format(&v2r0_quota_format); 335 unregister_quota_format(&v2r1_quota_format); 336 } 337 338 module_init(init_v2_quota_format); 339 module_exit(exit_v2_quota_format); 340