fs/ceph/xattr.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include "super.h"
   4 #include "mds_client.h"
   5
   6 #include <linux/ceph/decode.h>
   7
   8 #include <linux/xattr.h>
   9 #include <linux/posix_acl_xattr.h>
  10 #include <linux/slab.h>
  11
  12 #define XATTR_CEPH_PREFIX "ceph."
  13 #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
  14
  15 static int __remove_xattr(struct ceph_inode_info *ci,
  16                           struct ceph_inode_xattr *xattr);
  17
  18 /*
  19  * List of handlers for synthetic system.* attributes. Other
  20  * attributes are handled directly.
  21  */
  22 const struct xattr_handler *ceph_xattr_handlers[] = {
  23 #ifdef CONFIG_CEPH_FS_POSIX_ACL
  24         &posix_acl_access_xattr_handler,
  25         &posix_acl_default_xattr_handler,
  26 #endif
  27         NULL,
  28 };
  29
  30 static bool ceph_is_valid_xattr(const char *name)
  31 {
  32         return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
  33                !strncmp(name, XATTR_SECURITY_PREFIX,
  34                         XATTR_SECURITY_PREFIX_LEN) ||
  35                !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
  36                !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
  37                !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
  38 }
  39
  40 /*
  41  * These define virtual xattrs exposing the recursive directory
  42  * statistics and layout metadata.
  43  */
  44 struct ceph_vxattr {
  45         char *name;
  46         size_t name_size;       /* strlen(name) + 1 (for '\0') */
  47         size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
  48                               size_t size);
  49         bool readonly, hidden;
  50         bool (*exists_cb)(struct ceph_inode_info *ci);
  51 };
  52
  53 /* layouts */
  54
  55 static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
  56 {
  57         size_t s;
  58         char *p = (char *)&ci->i_layout;
  59
  60         for (s = 0; s < sizeof(ci->i_layout); s++, p++)
  61                 if (*p)
  62                         return true;
  63         return false;
  64 }
  65
  66 static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
  67                                    size_t size)
  68 {
  69         int ret;
  70         struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
  71         struct ceph_osd_client *osdc = &fsc->client->osdc;
  72         s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
  73         const char *pool_name;
  74         char buf[128];
  75
  76         dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
  77         down_read(&osdc->map_sem);
  78         pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
  79         if (pool_name) {
  80                 size_t len = strlen(pool_name);
  81                 ret = snprintf(buf, sizeof(buf),
  82                 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=",
  83                 (unsigned long long)ceph_file_layout_su(ci->i_layout),
  84                 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
  85                 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
  86                 if (!size) {
  87                         ret += len;
  88                 } else if (ret + len > size) {
  89                         ret = -ERANGE;
  90                 } else {
  91                         memcpy(val, buf, ret);
  92                         memcpy(val + ret, pool_name, len);
  93                         ret += len;
  94                 }
  95         } else {
  96                 ret = snprintf(buf, sizeof(buf),
  97                 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
  98                 (unsigned long long)ceph_file_layout_su(ci->i_layout),
  99                 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
 100                 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
 101                 (unsigned long long)pool);
 102                 if (size) {
 103                         if (ret <= size)
 104                                 memcpy(val, buf, ret);
 105                         else
 106                                 ret = -ERANGE;
 107                 }
 108         }
 109         up_read(&osdc->map_sem);
 110         return ret;
 111 }
 112
 113 static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
 114                                                char *val, size_t size)
 115 {
 116         return snprintf(val, size, "%lld",
 117                         (unsigned long long)ceph_file_layout_su(ci->i_layout));
 118 }
 119
 120 static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
 121                                                 char *val, size_t size)
 122 {
 123         return snprintf(val, size, "%lld",
 124                (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
 125 }
 126
 127 static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
 128                                                char *val, size_t size)
 129 {
 130         return snprintf(val, size, "%lld",
 131                (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
 132 }
 133
 134 static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
 135                                         char *val, size_t size)
 136 {
 137         int ret;
 138         struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
 139         struct ceph_osd_client *osdc = &fsc->client->osdc;
 140         s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
 141         const char *pool_name;
 142
 143         down_read(&osdc->map_sem);
 144         pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
 145         if (pool_name)
 146                 ret = snprintf(val, size, "%s", pool_name);
 147         else
 148                 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
 149         up_read(&osdc->map_sem);
 150         return ret;
 151 }
 152
 153 /* directories */
 154
 155 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
 156                                         size_t size)
 157 {
 158         return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
 159 }
 160
 161 static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
 162                                       size_t size)
 163 {
 164         return snprintf(val, size, "%lld", ci->i_files);
 165 }
 166
 167 static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
 168                                         size_t size)
 169 {
 170         return snprintf(val, size, "%lld", ci->i_subdirs);
 171 }
 172
 173 static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
 174                                          size_t size)
 175 {
 176         return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
 177 }
 178
 179 static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
 180                                        size_t size)
 181 {
 182         return snprintf(val, size, "%lld", ci->i_rfiles);
 183 }
 184
 185 static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
 186                                          size_t size)
 187 {
 188         return snprintf(val, size, "%lld", ci->i_rsubdirs);
 189 }
 190
 191 static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
 192                                        size_t size)
 193 {
 194         return snprintf(val, size, "%lld", ci->i_rbytes);
 195 }
 196
 197 static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
 198                                        size_t size)
 199 {
 200         return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
 201                         (long)ci->i_rctime.tv_nsec);
 202 }
 203
 204
 205 #define CEPH_XATTR_NAME(_type, _name)   XATTR_CEPH_PREFIX #_type "." #_name
 206 #define CEPH_XATTR_NAME2(_type, _name, _name2)  \
 207         XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
 208
 209 #define XATTR_NAME_CEPH(_type, _name)                                   \
 210         {                                                               \
 211                 .name = CEPH_XATTR_NAME(_type, _name),                  \
 212                 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
 213                 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
 214                 .readonly = true,                               \
 215                 .hidden = false,                                \
 216                 .exists_cb = NULL,                      \
 217         }
 218 #define XATTR_LAYOUT_FIELD(_type, _name, _field)                        \
 219         {                                                               \
 220                 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
 221                 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
 222                 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
 223                 .readonly = false,                              \
 224                 .hidden = true,                 \
 225                 .exists_cb = ceph_vxattrcb_layout_exists,       \
 226         }
 227
 228 static struct ceph_vxattr ceph_dir_vxattrs[] = {
 229         {
 230                 .name = "ceph.dir.layout",
 231                 .name_size = sizeof("ceph.dir.layout"),
 232                 .getxattr_cb = ceph_vxattrcb_layout,
 233                 .readonly = false,
 234                 .hidden = true,
 235                 .exists_cb = ceph_vxattrcb_layout_exists,
 236         },
 237         XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
 238         XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
 239         XATTR_LAYOUT_FIELD(dir, layout, object_size),
 240         XATTR_LAYOUT_FIELD(dir, layout, pool),
 241         XATTR_NAME_CEPH(dir, entries),
 242         XATTR_NAME_CEPH(dir, files),
 243         XATTR_NAME_CEPH(dir, subdirs),
 244         XATTR_NAME_CEPH(dir, rentries),
 245         XATTR_NAME_CEPH(dir, rfiles),
 246         XATTR_NAME_CEPH(dir, rsubdirs),
 247         XATTR_NAME_CEPH(dir, rbytes),
 248         XATTR_NAME_CEPH(dir, rctime),
 249         { .name = NULL, 0 }     /* Required table terminator */
 250 };
 251 static size_t ceph_dir_vxattrs_name_size;       /* total size of all names */
 252
 253 /* files */
 254
 255 static struct ceph_vxattr ceph_file_vxattrs[] = {
 256         {
 257                 .name = "ceph.file.layout",
 258                 .name_size = sizeof("ceph.file.layout"),
 259                 .getxattr_cb = ceph_vxattrcb_layout,
 260                 .readonly = false,
 261                 .hidden = true,
 262                 .exists_cb = ceph_vxattrcb_layout_exists,
 263         },
 264         XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
 265         XATTR_LAYOUT_FIELD(file, layout, stripe_count),
 266         XATTR_LAYOUT_FIELD(file, layout, object_size),
 267         XATTR_LAYOUT_FIELD(file, layout, pool),
 268         { .name = NULL, 0 }     /* Required table terminator */
 269 };
 270 static size_t ceph_file_vxattrs_name_size;      /* total size of all names */
 271
 272 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
 273 {
 274         if (S_ISDIR(inode->i_mode))
 275                 return ceph_dir_vxattrs;
 276         else if (S_ISREG(inode->i_mode))
 277                 return ceph_file_vxattrs;
 278         return NULL;
 279 }
 280
 281 static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
 282 {
 283         if (vxattrs == ceph_dir_vxattrs)
 284                 return ceph_dir_vxattrs_name_size;
 285         if (vxattrs == ceph_file_vxattrs)
 286                 return ceph_file_vxattrs_name_size;
 287         BUG();
 288
 289         return 0;
 290 }
 291
 292 /*
 293  * Compute the aggregate size (including terminating '\0') of all
 294  * virtual extended attribute names in the given vxattr table.
 295  */
 296 static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
 297 {
 298         struct ceph_vxattr *vxattr;
 299         size_t size = 0;
 300
 301         for (vxattr = vxattrs; vxattr->name; vxattr++)
 302                 if (!vxattr->hidden)
 303                         size += vxattr->name_size;
 304
 305         return size;
 306 }
 307
 308 /* Routines called at initialization and exit time */
 309
 310 void __init ceph_xattr_init(void)
 311 {
 312         ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
 313         ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
 314 }
 315
 316 void ceph_xattr_exit(void)
 317 {
 318         ceph_dir_vxattrs_name_size = 0;
 319         ceph_file_vxattrs_name_size = 0;
 320 }
 321
 322 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
 323                                                 const char *name)
 324 {
 325         struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
 326
 327         if (vxattr) {
 328                 while (vxattr->name) {
 329                         if (!strcmp(vxattr->name, name))
 330                                 return vxattr;
 331                         vxattr++;
 332                 }
 333         }
 334
 335         return NULL;
 336 }
 337
 338 static int __set_xattr(struct ceph_inode_info *ci,
 339                            const char *name, int name_len,
 340                            const char *val, int val_len,
 341                            int flags, int update_xattr,
 342                            struct ceph_inode_xattr **newxattr)
 343 {
 344         struct rb_node **p;
 345         struct rb_node *parent = NULL;
 346         struct ceph_inode_xattr *xattr = NULL;
 347         int c;
 348         int new = 0;
 349
 350         p = &ci->i_xattrs.index.rb_node;
 351         while (*p) {
 352                 parent = *p;
 353                 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
 354                 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
 355                 if (c < 0)
 356                         p = &(*p)->rb_left;
 357                 else if (c > 0)
 358                         p = &(*p)->rb_right;
 359                 else {
 360                         if (name_len == xattr->name_len)
 361                                 break;
 362                         else if (name_len < xattr->name_len)
 363                                 p = &(*p)->rb_left;
 364                         else
 365                                 p = &(*p)->rb_right;
 366                 }
 367                 xattr = NULL;
 368         }
 369
 370         if (update_xattr) {
 371                 int err = 0;
 372                 if (xattr && (flags & XATTR_CREATE))
 373                         err = -EEXIST;
 374                 else if (!xattr && (flags & XATTR_REPLACE))
 375                         err = -ENODATA;
 376                 if (err) {
 377                         kfree(name);
 378                         kfree(val);
 379                         return err;
 380                 }
 381                 if (update_xattr < 0) {
 382                         if (xattr)
 383                                 __remove_xattr(ci, xattr);
 384                         kfree(name);
 385                         return 0;
 386                 }
 387         }
 388
 389         if (!xattr) {
 390                 new = 1;
 391                 xattr = *newxattr;
 392                 xattr->name = name;
 393                 xattr->name_len = name_len;
 394                 xattr->should_free_name = update_xattr;
 395
 396                 ci->i_xattrs.count++;
 397                 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
 398         } else {
 399                 kfree(*newxattr);
 400                 *newxattr = NULL;
 401                 if (xattr->should_free_val)
 402                         kfree((void *)xattr->val);
 403
 404                 if (update_xattr) {
 405                         kfree((void *)name);
 406                         name = xattr->name;
 407                 }
 408                 ci->i_xattrs.names_size -= xattr->name_len;
 409                 ci->i_xattrs.vals_size -= xattr->val_len;
 410         }
 411         ci->i_xattrs.names_size += name_len;
 412         ci->i_xattrs.vals_size += val_len;
 413         if (val)
 414                 xattr->val = val;
 415         else
 416                 xattr->val = "";
 417
 418         xattr->val_len = val_len;
 419         xattr->dirty = update_xattr;
 420         xattr->should_free_val = (val && update_xattr);
 421
 422         if (new) {
 423                 rb_link_node(&xattr->node, parent, p);
 424                 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
 425                 dout("__set_xattr_val p=%p\n", p);
 426         }
 427
 428         dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
 429              ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
 430
 431         return 0;
 432 }
 433
 434 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
 435                            const char *name)
 436 {
 437         struct rb_node **p;
 438         struct rb_node *parent = NULL;
 439         struct ceph_inode_xattr *xattr = NULL;
 440         int name_len = strlen(name);
 441         int c;
 442
 443         p = &ci->i_xattrs.index.rb_node;
 444         while (*p) {
 445                 parent = *p;
 446                 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
 447                 c = strncmp(name, xattr->name, xattr->name_len);
 448                 if (c == 0 && name_len > xattr->name_len)
 449                         c = 1;
 450                 if (c < 0)
 451                         p = &(*p)->rb_left;
 452                 else if (c > 0)
 453                         p = &(*p)->rb_right;
 454                 else {
 455                         dout("__get_xattr %s: found %.*s\n", name,
 456                              xattr->val_len, xattr->val);
 457                         return xattr;
 458                 }
 459         }
 460
 461         dout("__get_xattr %s: not found\n", name);
 462
 463         return NULL;
 464 }
 465
 466 static void __free_xattr(struct ceph_inode_xattr *xattr)
 467 {
 468         BUG_ON(!xattr);
 469
 470         if (xattr->should_free_name)
 471                 kfree((void *)xattr->name);
 472         if (xattr->should_free_val)
 473                 kfree((void *)xattr->val);
 474
 475         kfree(xattr);
 476 }
 477
 478 static int __remove_xattr(struct ceph_inode_info *ci,
 479                           struct ceph_inode_xattr *xattr)
 480 {
 481         if (!xattr)
 482                 return -ENODATA;
 483
 484         rb_erase(&xattr->node, &ci->i_xattrs.index);
 485
 486         if (xattr->should_free_name)
 487                 kfree((void *)xattr->name);
 488         if (xattr->should_free_val)
 489                 kfree((void *)xattr->val);
 490
 491         ci->i_xattrs.names_size -= xattr->name_len;
 492         ci->i_xattrs.vals_size -= xattr->val_len;
 493         ci->i_xattrs.count--;
 494         kfree(xattr);
 495
 496         return 0;
 497 }
 498
 499 static int __remove_xattr_by_name(struct ceph_inode_info *ci,
 500                            const char *name)
 501 {
 502         struct rb_node **p;
 503         struct ceph_inode_xattr *xattr;
 504         int err;
 505
 506         p = &ci->i_xattrs.index.rb_node;
 507         xattr = __get_xattr(ci, name);
 508         err = __remove_xattr(ci, xattr);
 509         return err;
 510 }
 511
 512 static char *__copy_xattr_names(struct ceph_inode_info *ci,
 513                                 char *dest)
 514 {
 515         struct rb_node *p;
 516         struct ceph_inode_xattr *xattr = NULL;
 517
 518         p = rb_first(&ci->i_xattrs.index);
 519         dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
 520
 521         while (p) {
 522                 xattr = rb_entry(p, struct ceph_inode_xattr, node);
 523                 memcpy(dest, xattr->name, xattr->name_len);
 524                 dest[xattr->name_len] = '\0';
 525
 526                 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
 527                      xattr->name_len, ci->i_xattrs.names_size);
 528
 529                 dest += xattr->name_len + 1;
 530                 p = rb_next(p);
 531         }
 532
 533         return dest;
 534 }
 535
 536 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
 537 {
 538         struct rb_node *p, *tmp;
 539         struct ceph_inode_xattr *xattr = NULL;
 540
 541         p = rb_first(&ci->i_xattrs.index);
 542
 543         dout("__ceph_destroy_xattrs p=%p\n", p);
 544
 545         while (p) {
 546                 xattr = rb_entry(p, struct ceph_inode_xattr, node);
 547                 tmp = p;
 548                 p = rb_next(tmp);
 549                 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
 550                      xattr->name_len, xattr->name);
 551                 rb_erase(tmp, &ci->i_xattrs.index);
 552
 553                 __free_xattr(xattr);
 554         }
 555
 556         ci->i_xattrs.names_size = 0;
 557         ci->i_xattrs.vals_size = 0;
 558         ci->i_xattrs.index_version = 0;
 559         ci->i_xattrs.count = 0;
 560         ci->i_xattrs.index = RB_ROOT;
 561 }
 562
 563 static int __build_xattrs(struct inode *inode)
 564         __releases(ci->i_ceph_lock)
 565         __acquires(ci->i_ceph_lock)
 566 {
 567         u32 namelen;
 568         u32 numattr = 0;
 569         void *p, *end;
 570         u32 len;
 571         const char *name, *val;
 572         struct ceph_inode_info *ci = ceph_inode(inode);
 573         int xattr_version;
 574         struct ceph_inode_xattr **xattrs = NULL;
 575         int err = 0;
 576         int i;
 577
 578         dout("__build_xattrs() len=%d\n",
 579              ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
 580
 581         if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
 582                 return 0; /* already built */
 583
 584         __ceph_destroy_xattrs(ci);
 585
 586 start:
 587         /* updated internal xattr rb tree */
 588         if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
 589                 p = ci->i_xattrs.blob->vec.iov_base;
 590                 end = p + ci->i_xattrs.blob->vec.iov_len;
 591                 ceph_decode_32_safe(&p, end, numattr, bad);
 592                 xattr_version = ci->i_xattrs.version;
 593                 spin_unlock(&ci->i_ceph_lock);
 594
 595                 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
 596                                  GFP_NOFS);
 597                 err = -ENOMEM;
 598                 if (!xattrs)
 599                         goto bad_lock;
 600                 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
 601                 for (i = 0; i < numattr; i++) {
 602                         xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
 603                                             GFP_NOFS);
 604                         if (!xattrs[i])
 605                                 goto bad_lock;
 606                 }
 607
 608                 spin_lock(&ci->i_ceph_lock);
 609                 if (ci->i_xattrs.version != xattr_version) {
 610                         /* lost a race, retry */
 611                         for (i = 0; i < numattr; i++)
 612                                 kfree(xattrs[i]);
 613                         kfree(xattrs);
 614                         xattrs = NULL;
 615                         goto start;
 616                 }
 617                 err = -EIO;
 618                 while (numattr--) {
 619                         ceph_decode_32_safe(&p, end, len, bad);
 620                         namelen = len;
 621                         name = p;
 622                         p += len;
 623                         ceph_decode_32_safe(&p, end, len, bad);
 624                         val = p;
 625                         p += len;
 626
 627                         err = __set_xattr(ci, name, namelen, val, len,
 628                                           0, 0, &xattrs[numattr]);
 629
 630                         if (err < 0)
 631                                 goto bad;
 632                 }
 633                 kfree(xattrs);
 634         }
 635         ci->i_xattrs.index_version = ci->i_xattrs.version;
 636         ci->i_xattrs.dirty = false;
 637
 638         return err;
 639 bad_lock:
 640         spin_lock(&ci->i_ceph_lock);
 641 bad:
 642         if (xattrs) {
 643                 for (i = 0; i < numattr; i++)
 644                         kfree(xattrs[i]);
 645                 kfree(xattrs);
 646         }
 647         ci->i_xattrs.names_size = 0;
 648         return err;
 649 }
 650
 651 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
 652                                     int val_size)
 653 {
 654         /*
 655          * 4 bytes for the length, and additional 4 bytes per each xattr name,
 656          * 4 bytes per each value
 657          */
 658         int size = 4 + ci->i_xattrs.count*(4 + 4) +
 659                              ci->i_xattrs.names_size +
 660                              ci->i_xattrs.vals_size;
 661         dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
 662              ci->i_xattrs.count, ci->i_xattrs.names_size,
 663              ci->i_xattrs.vals_size);
 664
 665         if (name_size)
 666                 size += 4 + 4 + name_size + val_size;
 667
 668         return size;
 669 }
 670
 671 /*
 672  * If there are dirty xattrs, reencode xattrs into the prealloc_blob
 673  * and swap into place.
 674  */
 675 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
 676 {
 677         struct rb_node *p;
 678         struct ceph_inode_xattr *xattr = NULL;
 679         void *dest;
 680
 681         dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
 682         if (ci->i_xattrs.dirty) {
 683                 int need = __get_required_blob_size(ci, 0, 0);
 684
 685                 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
 686
 687                 p = rb_first(&ci->i_xattrs.index);
 688                 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
 689
 690                 ceph_encode_32(&dest, ci->i_xattrs.count);
 691                 while (p) {
 692                         xattr = rb_entry(p, struct ceph_inode_xattr, node);
 693
 694                         ceph_encode_32(&dest, xattr->name_len);
 695                         memcpy(dest, xattr->name, xattr->name_len);
 696                         dest += xattr->name_len;
 697                         ceph_encode_32(&dest, xattr->val_len);
 698                         memcpy(dest, xattr->val, xattr->val_len);
 699                         dest += xattr->val_len;
 700
 701                         p = rb_next(p);
 702                 }
 703
 704                 /* adjust buffer len; it may be larger than we need */
 705                 ci->i_xattrs.prealloc_blob->vec.iov_len =
 706                         dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
 707
 708                 if (ci->i_xattrs.blob)
 709                         ceph_buffer_put(ci->i_xattrs.blob);
 710                 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
 711                 ci->i_xattrs.prealloc_blob = NULL;
 712                 ci->i_xattrs.dirty = false;
 713                 ci->i_xattrs.version++;
 714         }
 715 }
 716
 717 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
 718                       size_t size)
 719 {
 720         struct ceph_inode_info *ci = ceph_inode(inode);
 721         int err;
 722         struct ceph_inode_xattr *xattr;
 723         struct ceph_vxattr *vxattr = NULL;
 724
 725         if (!ceph_is_valid_xattr(name))
 726                 return -ENODATA;
 727
 728         /* let's see if a virtual xattr was requested */
 729         vxattr = ceph_match_vxattr(inode, name);
 730         if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
 731                 err = vxattr->getxattr_cb(ci, value, size);
 732                 return err;
 733         }
 734
 735         spin_lock(&ci->i_ceph_lock);
 736         dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
 737              ci->i_xattrs.version, ci->i_xattrs.index_version);
 738
 739         if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
 740             (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
 741                 goto get_xattr;
 742         } else {
 743                 spin_unlock(&ci->i_ceph_lock);
 744                 /* get xattrs from mds (if we don't already have them) */
 745                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
 746                 if (err)
 747                         return err;
 748         }
 749
 750         spin_lock(&ci->i_ceph_lock);
 751
 752         err = __build_xattrs(inode);
 753         if (err < 0)
 754                 goto out;
 755
 756 get_xattr:
 757         err = -ENODATA;  /* == ENOATTR */
 758         xattr = __get_xattr(ci, name);
 759         if (!xattr)
 760                 goto out;
 761
 762         err = -ERANGE;
 763         if (size && size < xattr->val_len)
 764                 goto out;
 765
 766         err = xattr->val_len;
 767         if (size == 0)
 768                 goto out;
 769
 770         memcpy(value, xattr->val, xattr->val_len);
 771
 772 out:
 773         spin_unlock(&ci->i_ceph_lock);
 774         return err;
 775 }
 776
 777 ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
 778                       size_t size)
 779 {
 780         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
 781                 return generic_getxattr(dentry, name, value, size);
 782
 783         return __ceph_getxattr(dentry->d_inode, name, value, size);
 784 }
 785
 786 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
 787 {
 788         struct inode *inode = dentry->d_inode;
 789         struct ceph_inode_info *ci = ceph_inode(inode);
 790         struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
 791         u32 vir_namelen = 0;
 792         u32 namelen;
 793         int err;
 794         u32 len;
 795         int i;
 796
 797         spin_lock(&ci->i_ceph_lock);
 798         dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
 799              ci->i_xattrs.version, ci->i_xattrs.index_version);
 800
 801         if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
 802             (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
 803                 goto list_xattr;
 804         } else {
 805                 spin_unlock(&ci->i_ceph_lock);
 806                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
 807                 if (err)
 808                         return err;
 809         }
 810
 811         spin_lock(&ci->i_ceph_lock);
 812
 813         err = __build_xattrs(inode);
 814         if (err < 0)
 815                 goto out;
 816
 817 list_xattr:
 818         /*
 819          * Start with virtual dir xattr names (if any) (including
 820          * terminating '\0' characters for each).
 821          */
 822         vir_namelen = ceph_vxattrs_name_size(vxattrs);
 823
 824         /* adding 1 byte per each variable due to the null termination */
 825         namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
 826         err = -ERANGE;
 827         if (size && vir_namelen + namelen > size)
 828                 goto out;
 829
 830         err = namelen + vir_namelen;
 831         if (size == 0)
 832                 goto out;
 833
 834         names = __copy_xattr_names(ci, names);
 835
 836         /* virtual xattr names, too */
 837         err = namelen;
 838         if (vxattrs) {
 839                 for (i = 0; vxattrs[i].name; i++) {
 840                         if (!vxattrs[i].hidden &&
 841                             !(vxattrs[i].exists_cb &&
 842                               !vxattrs[i].exists_cb(ci))) {
 843                                 len = sprintf(names, "%s", vxattrs[i].name);
 844                                 names += len + 1;
 845                                 err += len + 1;
 846                         }
 847                 }
 848         }
 849
 850 out:
 851         spin_unlock(&ci->i_ceph_lock);
 852         return err;
 853 }
 854
 855 static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
 856                               const char *value, size_t size, int flags)
 857 {
 858         struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
 859         struct inode *inode = dentry->d_inode;
 860         struct ceph_inode_info *ci = ceph_inode(inode);
 861         struct ceph_mds_request *req;
 862         struct ceph_mds_client *mdsc = fsc->mdsc;
 863         int err;
 864         int i, nr_pages;
 865         struct page **pages = NULL;
 866         void *kaddr;
 867
 868         /* copy value into some pages */
 869         nr_pages = calc_pages_for(0, size);
 870         if (nr_pages) {
 871                 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
 872                 if (!pages)
 873                         return -ENOMEM;
 874                 err = -ENOMEM;
 875                 for (i = 0; i < nr_pages; i++) {
 876                         pages[i] = __page_cache_alloc(GFP_NOFS);
 877                         if (!pages[i]) {
 878                                 nr_pages = i;
 879                                 goto out;
 880                         }
 881                         kaddr = kmap(pages[i]);
 882                         memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
 883                                min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
 884                 }
 885         }
 886
 887         dout("setxattr value=%.*s\n", (int)size, value);
 888
 889         if (!value)
 890                 flags |= CEPH_XATTR_REMOVE;
 891
 892         /* do request */
 893         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
 894                                        USE_AUTH_MDS);
 895         if (IS_ERR(req)) {
 896                 err = PTR_ERR(req);
 897                 goto out;
 898         }
 899         req->r_inode = inode;
 900         ihold(inode);
 901         req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
 902         req->r_num_caps = 1;
 903         req->r_args.setxattr.flags = cpu_to_le32(flags);
 904         req->r_path2 = kstrdup(name, GFP_NOFS);
 905
 906         req->r_pages = pages;
 907         req->r_num_pages = nr_pages;
 908         req->r_data_len = size;
 909
 910         dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
 911         err = ceph_mdsc_do_request(mdsc, NULL, req);
 912         ceph_mdsc_put_request(req);
 913         dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
 914
 915 out:
 916         if (pages) {
 917                 for (i = 0; i < nr_pages; i++)
 918                         __free_page(pages[i]);
 919                 kfree(pages);
 920         }
 921         return err;
 922 }
 923
 924 int __ceph_setxattr(struct dentry *dentry, const char *name,
 925                         const void *value, size_t size, int flags)
 926 {
 927         struct inode *inode = dentry->d_inode;
 928         struct ceph_vxattr *vxattr;
 929         struct ceph_inode_info *ci = ceph_inode(inode);
 930         int issued;
 931         int err;
 932         int dirty = 0;
 933         int name_len = strlen(name);
 934         int val_len = size;
 935         char *newname = NULL;
 936         char *newval = NULL;
 937         struct ceph_inode_xattr *xattr = NULL;
 938         int required_blob_size;
 939
 940         if (!ceph_is_valid_xattr(name))
 941                 return -EOPNOTSUPP;
 942
 943         vxattr = ceph_match_vxattr(inode, name);
 944         if (vxattr && vxattr->readonly)
 945                 return -EOPNOTSUPP;
 946
 947         /* pass any unhandled ceph.* xattrs through to the MDS */
 948         if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
 949                 goto do_sync_unlocked;
 950
 951         /* preallocate memory for xattr name, value, index node */
 952         err = -ENOMEM;
 953         newname = kmemdup(name, name_len + 1, GFP_NOFS);
 954         if (!newname)
 955                 goto out;
 956
 957         if (val_len) {
 958                 newval = kmemdup(value, val_len, GFP_NOFS);
 959                 if (!newval)
 960                         goto out;
 961         }
 962
 963         xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
 964         if (!xattr)
 965                 goto out;
 966
 967         spin_lock(&ci->i_ceph_lock);
 968 retry:
 969         issued = __ceph_caps_issued(ci, NULL);
 970         dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
 971         if (!(issued & CEPH_CAP_XATTR_EXCL))
 972                 goto do_sync;
 973         __build_xattrs(inode);
 974
 975         required_blob_size = __get_required_blob_size(ci, name_len, val_len);
 976
 977         if (!ci->i_xattrs.prealloc_blob ||
 978             required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
 979                 struct ceph_buffer *blob;
 980
 981                 spin_unlock(&ci->i_ceph_lock);
 982                 dout(" preaallocating new blob size=%d\n", required_blob_size);
 983                 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
 984                 if (!blob)
 985                         goto out;
 986                 spin_lock(&ci->i_ceph_lock);
 987                 if (ci->i_xattrs.prealloc_blob)
 988                         ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 989                 ci->i_xattrs.prealloc_blob = blob;
 990                 goto retry;
 991         }
 992
 993         err = __set_xattr(ci, newname, name_len, newval, val_len,
 994                           flags, value ? 1 : -1, &xattr);
 995
 996         if (!err) {
 997                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
 998                 ci->i_xattrs.dirty = true;
 999                 inode->i_ctime = CURRENT_TIME;
1000         }
1001
1002         spin_unlock(&ci->i_ceph_lock);
1003         if (dirty)
1004                 __mark_inode_dirty(inode, dirty);
1005         return err;
1006
1007 do_sync:
1008         spin_unlock(&ci->i_ceph_lock);
1009 do_sync_unlocked:
1010         err = ceph_sync_setxattr(dentry, name, value, size, flags);
1011 out:
1012         kfree(newname);
1013         kfree(newval);
1014         kfree(xattr);
1015         return err;
1016 }
1017
1018 int ceph_setxattr(struct dentry *dentry, const char *name,
1019                   const void *value, size_t size, int flags)
1020 {
1021         if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
1022                 return -EROFS;
1023
1024         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1025                 return generic_setxattr(dentry, name, value, size, flags);
1026
1027         return __ceph_setxattr(dentry, name, value, size, flags);
1028 }
1029
1030 static int ceph_send_removexattr(struct dentry *dentry, const char *name)
1031 {
1032         struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1033         struct ceph_mds_client *mdsc = fsc->mdsc;
1034         struct inode *inode = dentry->d_inode;
1035         struct ceph_mds_request *req;
1036         int err;
1037
1038         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
1039                                        USE_AUTH_MDS);
1040         if (IS_ERR(req))
1041                 return PTR_ERR(req);
1042         req->r_inode = inode;
1043         ihold(inode);
1044         req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1045         req->r_num_caps = 1;
1046         req->r_path2 = kstrdup(name, GFP_NOFS);
1047
1048         err = ceph_mdsc_do_request(mdsc, NULL, req);
1049         ceph_mdsc_put_request(req);
1050         return err;
1051 }
1052
1053 int __ceph_removexattr(struct dentry *dentry, const char *name)
1054 {
1055         struct inode *inode = dentry->d_inode;
1056         struct ceph_vxattr *vxattr;
1057         struct ceph_inode_info *ci = ceph_inode(inode);
1058         int issued;
1059         int err;
1060         int required_blob_size;
1061         int dirty;
1062
1063         if (!ceph_is_valid_xattr(name))
1064                 return -EOPNOTSUPP;
1065
1066         vxattr = ceph_match_vxattr(inode, name);
1067         if (vxattr && vxattr->readonly)
1068                 return -EOPNOTSUPP;
1069
1070         /* pass any unhandled ceph.* xattrs through to the MDS */
1071         if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1072                 goto do_sync_unlocked;
1073
1074         err = -ENOMEM;
1075         spin_lock(&ci->i_ceph_lock);
1076 retry:
1077         issued = __ceph_caps_issued(ci, NULL);
1078         dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1079
1080         if (!(issued & CEPH_CAP_XATTR_EXCL))
1081                 goto do_sync;
1082         __build_xattrs(inode);
1083
1084         required_blob_size = __get_required_blob_size(ci, 0, 0);
1085
1086         if (!ci->i_xattrs.prealloc_blob ||
1087             required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1088                 struct ceph_buffer *blob;
1089
1090                 spin_unlock(&ci->i_ceph_lock);
1091                 dout(" preaallocating new blob size=%d\n", required_blob_size);
1092                 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1093                 if (!blob)
1094                         goto out;
1095                 spin_lock(&ci->i_ceph_lock);
1096                 if (ci->i_xattrs.prealloc_blob)
1097                         ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1098                 ci->i_xattrs.prealloc_blob = blob;
1099                 goto retry;
1100         }
1101
1102         err = __remove_xattr_by_name(ceph_inode(inode), name);
1103
1104         dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
1105         ci->i_xattrs.dirty = true;
1106         inode->i_ctime = CURRENT_TIME;
1107         spin_unlock(&ci->i_ceph_lock);
1108         if (dirty)
1109                 __mark_inode_dirty(inode, dirty);
1110         return err;
1111 do_sync:
1112         spin_unlock(&ci->i_ceph_lock);
1113 do_sync_unlocked:
1114         err = ceph_send_removexattr(dentry, name);
1115 out:
1116         return err;
1117 }
1118
1119 int ceph_removexattr(struct dentry *dentry, const char *name)
1120 {
1121         if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
1122                 return -EROFS;
1123
1124         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1125                 return generic_removexattr(dentry, name);
1126
1127         return __ceph_removexattr(dentry, name);
1128 }