linux/fs/ceph/inode.c
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   1#include <linux/ceph/ceph_debug.h>
   2
   3#include <linux/module.h>
   4#include <linux/fs.h>
   5#include <linux/slab.h>
   6#include <linux/string.h>
   7#include <linux/uaccess.h>
   8#include <linux/kernel.h>
   9#include <linux/namei.h>
  10#include <linux/writeback.h>
  11#include <linux/vmalloc.h>
  12
  13#include "super.h"
  14#include "mds_client.h"
  15#include <linux/ceph/decode.h>
  16
  17/*
  18 * Ceph inode operations
  19 *
  20 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  21 * setattr, etc.), xattr helpers, and helpers for assimilating
  22 * metadata returned by the MDS into our cache.
  23 *
  24 * Also define helpers for doing asynchronous writeback, invalidation,
  25 * and truncation for the benefit of those who can't afford to block
  26 * (typically because they are in the message handler path).
  27 */
  28
  29static const struct inode_operations ceph_symlink_iops;
  30
  31static void ceph_invalidate_work(struct work_struct *work);
  32static void ceph_writeback_work(struct work_struct *work);
  33static void ceph_vmtruncate_work(struct work_struct *work);
  34
  35/*
  36 * find or create an inode, given the ceph ino number
  37 */
  38static int ceph_set_ino_cb(struct inode *inode, void *data)
  39{
  40        ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  41        inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  42        return 0;
  43}
  44
  45struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  46{
  47        struct inode *inode;
  48        ino_t t = ceph_vino_to_ino(vino);
  49
  50        inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  51        if (inode == NULL)
  52                return ERR_PTR(-ENOMEM);
  53        if (inode->i_state & I_NEW) {
  54                dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  55                     inode, ceph_vinop(inode), (u64)inode->i_ino);
  56                unlock_new_inode(inode);
  57        }
  58
  59        dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  60             vino.snap, inode);
  61        return inode;
  62}
  63
  64/*
  65 * get/constuct snapdir inode for a given directory
  66 */
  67struct inode *ceph_get_snapdir(struct inode *parent)
  68{
  69        struct ceph_vino vino = {
  70                .ino = ceph_ino(parent),
  71                .snap = CEPH_SNAPDIR,
  72        };
  73        struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  74        struct ceph_inode_info *ci = ceph_inode(inode);
  75
  76        BUG_ON(!S_ISDIR(parent->i_mode));
  77        if (IS_ERR(inode))
  78                return inode;
  79        inode->i_mode = parent->i_mode;
  80        inode->i_uid = parent->i_uid;
  81        inode->i_gid = parent->i_gid;
  82        inode->i_op = &ceph_dir_iops;
  83        inode->i_fop = &ceph_dir_fops;
  84        ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  85        ci->i_rbytes = 0;
  86        return inode;
  87}
  88
  89const struct inode_operations ceph_file_iops = {
  90        .permission = ceph_permission,
  91        .setattr = ceph_setattr,
  92        .getattr = ceph_getattr,
  93        .setxattr = ceph_setxattr,
  94        .getxattr = ceph_getxattr,
  95        .listxattr = ceph_listxattr,
  96        .removexattr = ceph_removexattr,
  97};
  98
  99
 100/*
 101 * We use a 'frag tree' to keep track of the MDS's directory fragments
 102 * for a given inode (usually there is just a single fragment).  We
 103 * need to know when a child frag is delegated to a new MDS, or when
 104 * it is flagged as replicated, so we can direct our requests
 105 * accordingly.
 106 */
 107
 108/*
 109 * find/create a frag in the tree
 110 */
 111static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 112                                                    u32 f)
 113{
 114        struct rb_node **p;
 115        struct rb_node *parent = NULL;
 116        struct ceph_inode_frag *frag;
 117        int c;
 118
 119        p = &ci->i_fragtree.rb_node;
 120        while (*p) {
 121                parent = *p;
 122                frag = rb_entry(parent, struct ceph_inode_frag, node);
 123                c = ceph_frag_compare(f, frag->frag);
 124                if (c < 0)
 125                        p = &(*p)->rb_left;
 126                else if (c > 0)
 127                        p = &(*p)->rb_right;
 128                else
 129                        return frag;
 130        }
 131
 132        frag = kmalloc(sizeof(*frag), GFP_NOFS);
 133        if (!frag) {
 134                pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 135                       "frag %x\n", &ci->vfs_inode,
 136                       ceph_vinop(&ci->vfs_inode), f);
 137                return ERR_PTR(-ENOMEM);
 138        }
 139        frag->frag = f;
 140        frag->split_by = 0;
 141        frag->mds = -1;
 142        frag->ndist = 0;
 143
 144        rb_link_node(&frag->node, parent, p);
 145        rb_insert_color(&frag->node, &ci->i_fragtree);
 146
 147        dout("get_or_create_frag added %llx.%llx frag %x\n",
 148             ceph_vinop(&ci->vfs_inode), f);
 149        return frag;
 150}
 151
 152/*
 153 * find a specific frag @f
 154 */
 155struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 156{
 157        struct rb_node *n = ci->i_fragtree.rb_node;
 158
 159        while (n) {
 160                struct ceph_inode_frag *frag =
 161                        rb_entry(n, struct ceph_inode_frag, node);
 162                int c = ceph_frag_compare(f, frag->frag);
 163                if (c < 0)
 164                        n = n->rb_left;
 165                else if (c > 0)
 166                        n = n->rb_right;
 167                else
 168                        return frag;
 169        }
 170        return NULL;
 171}
 172
 173/*
 174 * Choose frag containing the given value @v.  If @pfrag is
 175 * specified, copy the frag delegation info to the caller if
 176 * it is present.
 177 */
 178u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 179                     struct ceph_inode_frag *pfrag,
 180                     int *found)
 181{
 182        u32 t = ceph_frag_make(0, 0);
 183        struct ceph_inode_frag *frag;
 184        unsigned nway, i;
 185        u32 n;
 186
 187        if (found)
 188                *found = 0;
 189
 190        mutex_lock(&ci->i_fragtree_mutex);
 191        while (1) {
 192                WARN_ON(!ceph_frag_contains_value(t, v));
 193                frag = __ceph_find_frag(ci, t);
 194                if (!frag)
 195                        break; /* t is a leaf */
 196                if (frag->split_by == 0) {
 197                        if (pfrag)
 198                                memcpy(pfrag, frag, sizeof(*pfrag));
 199                        if (found)
 200                                *found = 1;
 201                        break;
 202                }
 203
 204                /* choose child */
 205                nway = 1 << frag->split_by;
 206                dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 207                     frag->split_by, nway);
 208                for (i = 0; i < nway; i++) {
 209                        n = ceph_frag_make_child(t, frag->split_by, i);
 210                        if (ceph_frag_contains_value(n, v)) {
 211                                t = n;
 212                                break;
 213                        }
 214                }
 215                BUG_ON(i == nway);
 216        }
 217        dout("choose_frag(%x) = %x\n", v, t);
 218
 219        mutex_unlock(&ci->i_fragtree_mutex);
 220        return t;
 221}
 222
 223/*
 224 * Process dirfrag (delegation) info from the mds.  Include leaf
 225 * fragment in tree ONLY if ndist > 0.  Otherwise, only
 226 * branches/splits are included in i_fragtree)
 227 */
 228static int ceph_fill_dirfrag(struct inode *inode,
 229                             struct ceph_mds_reply_dirfrag *dirinfo)
 230{
 231        struct ceph_inode_info *ci = ceph_inode(inode);
 232        struct ceph_inode_frag *frag;
 233        u32 id = le32_to_cpu(dirinfo->frag);
 234        int mds = le32_to_cpu(dirinfo->auth);
 235        int ndist = le32_to_cpu(dirinfo->ndist);
 236        int i;
 237        int err = 0;
 238
 239        mutex_lock(&ci->i_fragtree_mutex);
 240        if (ndist == 0) {
 241                /* no delegation info needed. */
 242                frag = __ceph_find_frag(ci, id);
 243                if (!frag)
 244                        goto out;
 245                if (frag->split_by == 0) {
 246                        /* tree leaf, remove */
 247                        dout("fill_dirfrag removed %llx.%llx frag %x"
 248                             " (no ref)\n", ceph_vinop(inode), id);
 249                        rb_erase(&frag->node, &ci->i_fragtree);
 250                        kfree(frag);
 251                } else {
 252                        /* tree branch, keep and clear */
 253                        dout("fill_dirfrag cleared %llx.%llx frag %x"
 254                             " referral\n", ceph_vinop(inode), id);
 255                        frag->mds = -1;
 256                        frag->ndist = 0;
 257                }
 258                goto out;
 259        }
 260
 261
 262        /* find/add this frag to store mds delegation info */
 263        frag = __get_or_create_frag(ci, id);
 264        if (IS_ERR(frag)) {
 265                /* this is not the end of the world; we can continue
 266                   with bad/inaccurate delegation info */
 267                pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 268                       ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 269                err = -ENOMEM;
 270                goto out;
 271        }
 272
 273        frag->mds = mds;
 274        frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 275        for (i = 0; i < frag->ndist; i++)
 276                frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 277        dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 278             ceph_vinop(inode), frag->frag, frag->ndist);
 279
 280out:
 281        mutex_unlock(&ci->i_fragtree_mutex);
 282        return err;
 283}
 284
 285
 286/*
 287 * initialize a newly allocated inode.
 288 */
 289struct inode *ceph_alloc_inode(struct super_block *sb)
 290{
 291        struct ceph_inode_info *ci;
 292        int i;
 293
 294        ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 295        if (!ci)
 296                return NULL;
 297
 298        dout("alloc_inode %p\n", &ci->vfs_inode);
 299
 300        spin_lock_init(&ci->i_ceph_lock);
 301
 302        ci->i_version = 0;
 303        ci->i_time_warp_seq = 0;
 304        ci->i_ceph_flags = 0;
 305        ci->i_release_count = 0;
 306        ci->i_symlink = NULL;
 307
 308        memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 309
 310        ci->i_fragtree = RB_ROOT;
 311        mutex_init(&ci->i_fragtree_mutex);
 312
 313        ci->i_xattrs.blob = NULL;
 314        ci->i_xattrs.prealloc_blob = NULL;
 315        ci->i_xattrs.dirty = false;
 316        ci->i_xattrs.index = RB_ROOT;
 317        ci->i_xattrs.count = 0;
 318        ci->i_xattrs.names_size = 0;
 319        ci->i_xattrs.vals_size = 0;
 320        ci->i_xattrs.version = 0;
 321        ci->i_xattrs.index_version = 0;
 322
 323        ci->i_caps = RB_ROOT;
 324        ci->i_auth_cap = NULL;
 325        ci->i_dirty_caps = 0;
 326        ci->i_flushing_caps = 0;
 327        INIT_LIST_HEAD(&ci->i_dirty_item);
 328        INIT_LIST_HEAD(&ci->i_flushing_item);
 329        ci->i_cap_flush_seq = 0;
 330        ci->i_cap_flush_last_tid = 0;
 331        memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 332        init_waitqueue_head(&ci->i_cap_wq);
 333        ci->i_hold_caps_min = 0;
 334        ci->i_hold_caps_max = 0;
 335        INIT_LIST_HEAD(&ci->i_cap_delay_list);
 336        ci->i_cap_exporting_mds = 0;
 337        ci->i_cap_exporting_mseq = 0;
 338        ci->i_cap_exporting_issued = 0;
 339        INIT_LIST_HEAD(&ci->i_cap_snaps);
 340        ci->i_head_snapc = NULL;
 341        ci->i_snap_caps = 0;
 342
 343        for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 344                ci->i_nr_by_mode[i] = 0;
 345
 346        ci->i_truncate_seq = 0;
 347        ci->i_truncate_size = 0;
 348        ci->i_truncate_pending = 0;
 349
 350        ci->i_max_size = 0;
 351        ci->i_reported_size = 0;
 352        ci->i_wanted_max_size = 0;
 353        ci->i_requested_max_size = 0;
 354
 355        ci->i_pin_ref = 0;
 356        ci->i_rd_ref = 0;
 357        ci->i_rdcache_ref = 0;
 358        ci->i_wr_ref = 0;
 359        ci->i_wb_ref = 0;
 360        ci->i_wrbuffer_ref = 0;
 361        ci->i_wrbuffer_ref_head = 0;
 362        ci->i_shared_gen = 0;
 363        ci->i_rdcache_gen = 0;
 364        ci->i_rdcache_revoking = 0;
 365
 366        INIT_LIST_HEAD(&ci->i_unsafe_writes);
 367        INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 368        spin_lock_init(&ci->i_unsafe_lock);
 369
 370        ci->i_snap_realm = NULL;
 371        INIT_LIST_HEAD(&ci->i_snap_realm_item);
 372        INIT_LIST_HEAD(&ci->i_snap_flush_item);
 373
 374        INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 375        INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 376
 377        INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 378
 379        return &ci->vfs_inode;
 380}
 381
 382static void ceph_i_callback(struct rcu_head *head)
 383{
 384        struct inode *inode = container_of(head, struct inode, i_rcu);
 385        struct ceph_inode_info *ci = ceph_inode(inode);
 386
 387        kmem_cache_free(ceph_inode_cachep, ci);
 388}
 389
 390void ceph_destroy_inode(struct inode *inode)
 391{
 392        struct ceph_inode_info *ci = ceph_inode(inode);
 393        struct ceph_inode_frag *frag;
 394        struct rb_node *n;
 395
 396        dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 397
 398        ceph_queue_caps_release(inode);
 399
 400        /*
 401         * we may still have a snap_realm reference if there are stray
 402         * caps in i_cap_exporting_issued or i_snap_caps.
 403         */
 404        if (ci->i_snap_realm) {
 405                struct ceph_mds_client *mdsc =
 406                        ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 407                struct ceph_snap_realm *realm = ci->i_snap_realm;
 408
 409                dout(" dropping residual ref to snap realm %p\n", realm);
 410                spin_lock(&realm->inodes_with_caps_lock);
 411                list_del_init(&ci->i_snap_realm_item);
 412                spin_unlock(&realm->inodes_with_caps_lock);
 413                ceph_put_snap_realm(mdsc, realm);
 414        }
 415
 416        kfree(ci->i_symlink);
 417        while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 418                frag = rb_entry(n, struct ceph_inode_frag, node);
 419                rb_erase(n, &ci->i_fragtree);
 420                kfree(frag);
 421        }
 422
 423        __ceph_destroy_xattrs(ci);
 424        if (ci->i_xattrs.blob)
 425                ceph_buffer_put(ci->i_xattrs.blob);
 426        if (ci->i_xattrs.prealloc_blob)
 427                ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 428
 429        call_rcu(&inode->i_rcu, ceph_i_callback);
 430}
 431
 432
 433/*
 434 * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 435 * careful because either the client or MDS may have more up to date
 436 * info, depending on which capabilities are held, and whether
 437 * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 438 * and size are monotonically increasing, except when utimes() or
 439 * truncate() increments the corresponding _seq values.)
 440 */
 441int ceph_fill_file_size(struct inode *inode, int issued,
 442                        u32 truncate_seq, u64 truncate_size, u64 size)
 443{
 444        struct ceph_inode_info *ci = ceph_inode(inode);
 445        int queue_trunc = 0;
 446
 447        if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 448            (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 449                dout("size %lld -> %llu\n", inode->i_size, size);
 450                inode->i_size = size;
 451                inode->i_blocks = (size + (1<<9) - 1) >> 9;
 452                ci->i_reported_size = size;
 453                if (truncate_seq != ci->i_truncate_seq) {
 454                        dout("truncate_seq %u -> %u\n",
 455                             ci->i_truncate_seq, truncate_seq);
 456                        ci->i_truncate_seq = truncate_seq;
 457                        /*
 458                         * If we hold relevant caps, or in the case where we're
 459                         * not the only client referencing this file and we
 460                         * don't hold those caps, then we need to check whether
 461                         * the file is either opened or mmaped
 462                         */
 463                        if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 464                                       CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 465                                       CEPH_CAP_FILE_EXCL|
 466                                       CEPH_CAP_FILE_LAZYIO)) ||
 467                            mapping_mapped(inode->i_mapping) ||
 468                            __ceph_caps_file_wanted(ci)) {
 469                                ci->i_truncate_pending++;
 470                                queue_trunc = 1;
 471                        }
 472                }
 473        }
 474        if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 475            ci->i_truncate_size != truncate_size) {
 476                dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 477                     truncate_size);
 478                ci->i_truncate_size = truncate_size;
 479        }
 480        return queue_trunc;
 481}
 482
 483void ceph_fill_file_time(struct inode *inode, int issued,
 484                         u64 time_warp_seq, struct timespec *ctime,
 485                         struct timespec *mtime, struct timespec *atime)
 486{
 487        struct ceph_inode_info *ci = ceph_inode(inode);
 488        int warn = 0;
 489
 490        if (issued & (CEPH_CAP_FILE_EXCL|
 491                      CEPH_CAP_FILE_WR|
 492                      CEPH_CAP_FILE_BUFFER|
 493                      CEPH_CAP_AUTH_EXCL|
 494                      CEPH_CAP_XATTR_EXCL)) {
 495                if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 496                        dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 497                             inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 498                             ctime->tv_sec, ctime->tv_nsec);
 499                        inode->i_ctime = *ctime;
 500                }
 501                if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 502                        /* the MDS did a utimes() */
 503                        dout("mtime %ld.%09ld -> %ld.%09ld "
 504                             "tw %d -> %d\n",
 505                             inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 506                             mtime->tv_sec, mtime->tv_nsec,
 507                             ci->i_time_warp_seq, (int)time_warp_seq);
 508
 509                        inode->i_mtime = *mtime;
 510                        inode->i_atime = *atime;
 511                        ci->i_time_warp_seq = time_warp_seq;
 512                } else if (time_warp_seq == ci->i_time_warp_seq) {
 513                        /* nobody did utimes(); take the max */
 514                        if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 515                                dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 516                                     inode->i_mtime.tv_sec,
 517                                     inode->i_mtime.tv_nsec,
 518                                     mtime->tv_sec, mtime->tv_nsec);
 519                                inode->i_mtime = *mtime;
 520                        }
 521                        if (timespec_compare(atime, &inode->i_atime) > 0) {
 522                                dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 523                                     inode->i_atime.tv_sec,
 524                                     inode->i_atime.tv_nsec,
 525                                     atime->tv_sec, atime->tv_nsec);
 526                                inode->i_atime = *atime;
 527                        }
 528                } else if (issued & CEPH_CAP_FILE_EXCL) {
 529                        /* we did a utimes(); ignore mds values */
 530                } else {
 531                        warn = 1;
 532                }
 533        } else {
 534                /* we have no write|excl caps; whatever the MDS says is true */
 535                if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 536                        inode->i_ctime = *ctime;
 537                        inode->i_mtime = *mtime;
 538                        inode->i_atime = *atime;
 539                        ci->i_time_warp_seq = time_warp_seq;
 540                } else {
 541                        warn = 1;
 542                }
 543        }
 544        if (warn) /* time_warp_seq shouldn't go backwards */
 545                dout("%p mds time_warp_seq %llu < %u\n",
 546                     inode, time_warp_seq, ci->i_time_warp_seq);
 547}
 548
 549/*
 550 * Populate an inode based on info from mds.  May be called on new or
 551 * existing inodes.
 552 */
 553static int fill_inode(struct inode *inode,
 554                      struct ceph_mds_reply_info_in *iinfo,
 555                      struct ceph_mds_reply_dirfrag *dirinfo,
 556                      struct ceph_mds_session *session,
 557                      unsigned long ttl_from, int cap_fmode,
 558                      struct ceph_cap_reservation *caps_reservation)
 559{
 560        struct ceph_mds_reply_inode *info = iinfo->in;
 561        struct ceph_inode_info *ci = ceph_inode(inode);
 562        int i;
 563        int issued = 0, implemented;
 564        int updating_inode = 0;
 565        struct timespec mtime, atime, ctime;
 566        u32 nsplits;
 567        struct ceph_buffer *xattr_blob = NULL;
 568        int err = 0;
 569        int queue_trunc = 0;
 570
 571        dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 572             inode, ceph_vinop(inode), le64_to_cpu(info->version),
 573             ci->i_version);
 574
 575        /*
 576         * prealloc xattr data, if it looks like we'll need it.  only
 577         * if len > 4 (meaning there are actually xattrs; the first 4
 578         * bytes are the xattr count).
 579         */
 580        if (iinfo->xattr_len > 4) {
 581                xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 582                if (!xattr_blob)
 583                        pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 584                               iinfo->xattr_len);
 585        }
 586
 587        spin_lock(&ci->i_ceph_lock);
 588
 589        /*
 590         * provided version will be odd if inode value is projected,
 591         * even if stable.  skip the update if we have newer stable
 592         * info (ours>=theirs, e.g. due to racing mds replies), unless
 593         * we are getting projected (unstable) info (in which case the
 594         * version is odd, and we want ours>theirs).
 595         *   us   them
 596         *   2    2     skip
 597         *   3    2     skip
 598         *   3    3     update
 599         */
 600        if (le64_to_cpu(info->version) > 0 &&
 601            (ci->i_version & ~1) >= le64_to_cpu(info->version))
 602                goto no_change;
 603        
 604        updating_inode = 1;
 605        issued = __ceph_caps_issued(ci, &implemented);
 606        issued |= implemented | __ceph_caps_dirty(ci);
 607
 608        /* update inode */
 609        ci->i_version = le64_to_cpu(info->version);
 610        inode->i_version++;
 611        inode->i_rdev = le32_to_cpu(info->rdev);
 612
 613        if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 614                inode->i_mode = le32_to_cpu(info->mode);
 615                inode->i_uid = le32_to_cpu(info->uid);
 616                inode->i_gid = le32_to_cpu(info->gid);
 617                dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 618                     inode->i_uid, inode->i_gid);
 619        }
 620
 621        if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 622                set_nlink(inode, le32_to_cpu(info->nlink));
 623
 624        /* be careful with mtime, atime, size */
 625        ceph_decode_timespec(&atime, &info->atime);
 626        ceph_decode_timespec(&mtime, &info->mtime);
 627        ceph_decode_timespec(&ctime, &info->ctime);
 628        queue_trunc = ceph_fill_file_size(inode, issued,
 629                                          le32_to_cpu(info->truncate_seq),
 630                                          le64_to_cpu(info->truncate_size),
 631                                          le64_to_cpu(info->size));
 632        ceph_fill_file_time(inode, issued,
 633                            le32_to_cpu(info->time_warp_seq),
 634                            &ctime, &mtime, &atime);
 635
 636        /* only update max_size on auth cap */
 637        if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 638            ci->i_max_size != le64_to_cpu(info->max_size)) {
 639                dout("max_size %lld -> %llu\n", ci->i_max_size,
 640                     le64_to_cpu(info->max_size));
 641                ci->i_max_size = le64_to_cpu(info->max_size);
 642        }
 643
 644        ci->i_layout = info->layout;
 645        inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 646
 647        /* xattrs */
 648        /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 649        if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 650            le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 651                if (ci->i_xattrs.blob)
 652                        ceph_buffer_put(ci->i_xattrs.blob);
 653                ci->i_xattrs.blob = xattr_blob;
 654                if (xattr_blob)
 655                        memcpy(ci->i_xattrs.blob->vec.iov_base,
 656                               iinfo->xattr_data, iinfo->xattr_len);
 657                ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 658                xattr_blob = NULL;
 659        }
 660
 661        inode->i_mapping->a_ops = &ceph_aops;
 662        inode->i_mapping->backing_dev_info =
 663                &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 664
 665        switch (inode->i_mode & S_IFMT) {
 666        case S_IFIFO:
 667        case S_IFBLK:
 668        case S_IFCHR:
 669        case S_IFSOCK:
 670                init_special_inode(inode, inode->i_mode, inode->i_rdev);
 671                inode->i_op = &ceph_file_iops;
 672                break;
 673        case S_IFREG:
 674                inode->i_op = &ceph_file_iops;
 675                inode->i_fop = &ceph_file_fops;
 676                break;
 677        case S_IFLNK:
 678                inode->i_op = &ceph_symlink_iops;
 679                if (!ci->i_symlink) {
 680                        u32 symlen = iinfo->symlink_len;
 681                        char *sym;
 682
 683                        spin_unlock(&ci->i_ceph_lock);
 684
 685                        err = -EINVAL;
 686                        if (WARN_ON(symlen != inode->i_size))
 687                                goto out;
 688
 689                        err = -ENOMEM;
 690                        sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 691                        if (!sym)
 692                                goto out;
 693
 694                        spin_lock(&ci->i_ceph_lock);
 695                        if (!ci->i_symlink)
 696                                ci->i_symlink = sym;
 697                        else
 698                                kfree(sym); /* lost a race */
 699                }
 700                break;
 701        case S_IFDIR:
 702                inode->i_op = &ceph_dir_iops;
 703                inode->i_fop = &ceph_dir_fops;
 704
 705                ci->i_dir_layout = iinfo->dir_layout;
 706
 707                ci->i_files = le64_to_cpu(info->files);
 708                ci->i_subdirs = le64_to_cpu(info->subdirs);
 709                ci->i_rbytes = le64_to_cpu(info->rbytes);
 710                ci->i_rfiles = le64_to_cpu(info->rfiles);
 711                ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 712                ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 713                break;
 714        default:
 715                pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 716                       ceph_vinop(inode), inode->i_mode);
 717        }
 718
 719no_change:
 720        spin_unlock(&ci->i_ceph_lock);
 721
 722        /* queue truncate if we saw i_size decrease */
 723        if (queue_trunc)
 724                ceph_queue_vmtruncate(inode);
 725
 726        /* populate frag tree */
 727        /* FIXME: move me up, if/when version reflects fragtree changes */
 728        nsplits = le32_to_cpu(info->fragtree.nsplits);
 729        mutex_lock(&ci->i_fragtree_mutex);
 730        for (i = 0; i < nsplits; i++) {
 731                u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 732                struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 733
 734                if (IS_ERR(frag))
 735                        continue;
 736                frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 737                dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 738        }
 739        mutex_unlock(&ci->i_fragtree_mutex);
 740
 741        /* were we issued a capability? */
 742        if (info->cap.caps) {
 743                if (ceph_snap(inode) == CEPH_NOSNAP) {
 744                        ceph_add_cap(inode, session,
 745                                     le64_to_cpu(info->cap.cap_id),
 746                                     cap_fmode,
 747                                     le32_to_cpu(info->cap.caps),
 748                                     le32_to_cpu(info->cap.wanted),
 749                                     le32_to_cpu(info->cap.seq),
 750                                     le32_to_cpu(info->cap.mseq),
 751                                     le64_to_cpu(info->cap.realm),
 752                                     info->cap.flags,
 753                                     caps_reservation);
 754                } else {
 755                        spin_lock(&ci->i_ceph_lock);
 756                        dout(" %p got snap_caps %s\n", inode,
 757                             ceph_cap_string(le32_to_cpu(info->cap.caps)));
 758                        ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 759                        if (cap_fmode >= 0)
 760                                __ceph_get_fmode(ci, cap_fmode);
 761                        spin_unlock(&ci->i_ceph_lock);
 762                }
 763        } else if (cap_fmode >= 0) {
 764                pr_warning("mds issued no caps on %llx.%llx\n",
 765                           ceph_vinop(inode));
 766                __ceph_get_fmode(ci, cap_fmode);
 767        }
 768
 769        /* set dir completion flag? */
 770        if (S_ISDIR(inode->i_mode) &&
 771            updating_inode &&                 /* didn't jump to no_change */
 772            ci->i_files == 0 && ci->i_subdirs == 0 &&
 773            ceph_snap(inode) == CEPH_NOSNAP &&
 774            (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 775            (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 776            !ceph_dir_test_complete(inode)) {
 777                dout(" marking %p complete (empty)\n", inode);
 778                ceph_dir_set_complete(inode);
 779                ci->i_max_offset = 2;
 780        }
 781
 782        /* update delegation info? */
 783        if (dirinfo)
 784                ceph_fill_dirfrag(inode, dirinfo);
 785
 786        err = 0;
 787
 788out:
 789        if (xattr_blob)
 790                ceph_buffer_put(xattr_blob);
 791        return err;
 792}
 793
 794/*
 795 * caller should hold session s_mutex.
 796 */
 797static void update_dentry_lease(struct dentry *dentry,
 798                                struct ceph_mds_reply_lease *lease,
 799                                struct ceph_mds_session *session,
 800                                unsigned long from_time)
 801{
 802        struct ceph_dentry_info *di = ceph_dentry(dentry);
 803        long unsigned duration = le32_to_cpu(lease->duration_ms);
 804        long unsigned ttl = from_time + (duration * HZ) / 1000;
 805        long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 806        struct inode *dir;
 807
 808        /* only track leases on regular dentries */
 809        if (dentry->d_op != &ceph_dentry_ops)
 810                return;
 811
 812        spin_lock(&dentry->d_lock);
 813        dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 814             dentry, duration, ttl);
 815
 816        /* make lease_rdcache_gen match directory */
 817        dir = dentry->d_parent->d_inode;
 818        di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 819
 820        if (duration == 0)
 821                goto out_unlock;
 822
 823        if (di->lease_gen == session->s_cap_gen &&
 824            time_before(ttl, dentry->d_time))
 825                goto out_unlock;  /* we already have a newer lease. */
 826
 827        if (di->lease_session && di->lease_session != session)
 828                goto out_unlock;
 829
 830        ceph_dentry_lru_touch(dentry);
 831
 832        if (!di->lease_session)
 833                di->lease_session = ceph_get_mds_session(session);
 834        di->lease_gen = session->s_cap_gen;
 835        di->lease_seq = le32_to_cpu(lease->seq);
 836        di->lease_renew_after = half_ttl;
 837        di->lease_renew_from = 0;
 838        dentry->d_time = ttl;
 839out_unlock:
 840        spin_unlock(&dentry->d_lock);
 841        return;
 842}
 843
 844/*
 845 * Set dentry's directory position based on the current dir's max, and
 846 * order it in d_subdirs, so that dcache_readdir behaves.
 847 *
 848 * Always called under directory's i_mutex.
 849 */
 850static void ceph_set_dentry_offset(struct dentry *dn)
 851{
 852        struct dentry *dir = dn->d_parent;
 853        struct inode *inode = dir->d_inode;
 854        struct ceph_inode_info *ci;
 855        struct ceph_dentry_info *di;
 856
 857        BUG_ON(!inode);
 858
 859        ci = ceph_inode(inode);
 860        di = ceph_dentry(dn);
 861
 862        spin_lock(&ci->i_ceph_lock);
 863        if (!ceph_dir_test_complete(inode)) {
 864                spin_unlock(&ci->i_ceph_lock);
 865                return;
 866        }
 867        di->offset = ceph_inode(inode)->i_max_offset++;
 868        spin_unlock(&ci->i_ceph_lock);
 869
 870        spin_lock(&dir->d_lock);
 871        spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 872        list_move(&dn->d_u.d_child, &dir->d_subdirs);
 873        dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 874             dn->d_u.d_child.prev, dn->d_u.d_child.next);
 875        spin_unlock(&dn->d_lock);
 876        spin_unlock(&dir->d_lock);
 877}
 878
 879/*
 880 * splice a dentry to an inode.
 881 * caller must hold directory i_mutex for this to be safe.
 882 *
 883 * we will only rehash the resulting dentry if @prehash is
 884 * true; @prehash will be set to false (for the benefit of
 885 * the caller) if we fail.
 886 */
 887static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 888                                    bool *prehash, bool set_offset)
 889{
 890        struct dentry *realdn;
 891
 892        BUG_ON(dn->d_inode);
 893
 894        /* dn must be unhashed */
 895        if (!d_unhashed(dn))
 896                d_drop(dn);
 897        realdn = d_materialise_unique(dn, in);
 898        if (IS_ERR(realdn)) {
 899                pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 900                       PTR_ERR(realdn), dn, in, ceph_vinop(in));
 901                if (prehash)
 902                        *prehash = false; /* don't rehash on error */
 903                dn = realdn; /* note realdn contains the error */
 904                goto out;
 905        } else if (realdn) {
 906                dout("dn %p (%d) spliced with %p (%d) "
 907                     "inode %p ino %llx.%llx\n",
 908                     dn, dn->d_count,
 909                     realdn, realdn->d_count,
 910                     realdn->d_inode, ceph_vinop(realdn->d_inode));
 911                dput(dn);
 912                dn = realdn;
 913        } else {
 914                BUG_ON(!ceph_dentry(dn));
 915                dout("dn %p attached to %p ino %llx.%llx\n",
 916                     dn, dn->d_inode, ceph_vinop(dn->d_inode));
 917        }
 918        if ((!prehash || *prehash) && d_unhashed(dn))
 919                d_rehash(dn);
 920        if (set_offset)
 921                ceph_set_dentry_offset(dn);
 922out:
 923        return dn;
 924}
 925
 926/*
 927 * Incorporate results into the local cache.  This is either just
 928 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 929 * after a lookup).
 930 *
 931 * A reply may contain
 932 *         a directory inode along with a dentry.
 933 *  and/or a target inode
 934 *
 935 * Called with snap_rwsem (read).
 936 */
 937int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 938                    struct ceph_mds_session *session)
 939{
 940        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 941        struct inode *in = NULL;
 942        struct ceph_mds_reply_inode *ininfo;
 943        struct ceph_vino vino;
 944        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 945        int i = 0;
 946        int err = 0;
 947
 948        dout("fill_trace %p is_dentry %d is_target %d\n", req,
 949             rinfo->head->is_dentry, rinfo->head->is_target);
 950
 951#if 0
 952        /*
 953         * Debugging hook:
 954         *
 955         * If we resend completed ops to a recovering mds, we get no
 956         * trace.  Since that is very rare, pretend this is the case
 957         * to ensure the 'no trace' handlers in the callers behave.
 958         *
 959         * Fill in inodes unconditionally to avoid breaking cap
 960         * invariants.
 961         */
 962        if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 963                pr_info("fill_trace faking empty trace on %lld %s\n",
 964                        req->r_tid, ceph_mds_op_name(rinfo->head->op));
 965                if (rinfo->head->is_dentry) {
 966                        rinfo->head->is_dentry = 0;
 967                        err = fill_inode(req->r_locked_dir,
 968                                         &rinfo->diri, rinfo->dirfrag,
 969                                         session, req->r_request_started, -1);
 970                }
 971                if (rinfo->head->is_target) {
 972                        rinfo->head->is_target = 0;
 973                        ininfo = rinfo->targeti.in;
 974                        vino.ino = le64_to_cpu(ininfo->ino);
 975                        vino.snap = le64_to_cpu(ininfo->snapid);
 976                        in = ceph_get_inode(sb, vino);
 977                        err = fill_inode(in, &rinfo->targeti, NULL,
 978                                         session, req->r_request_started,
 979                                         req->r_fmode);
 980                        iput(in);
 981                }
 982        }
 983#endif
 984
 985        if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 986                dout("fill_trace reply is empty!\n");
 987                if (rinfo->head->result == 0 && req->r_locked_dir)
 988                        ceph_invalidate_dir_request(req);
 989                return 0;
 990        }
 991
 992        if (rinfo->head->is_dentry) {
 993                struct inode *dir = req->r_locked_dir;
 994
 995                if (dir) {
 996                        err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 997                                         session, req->r_request_started, -1,
 998                                         &req->r_caps_reservation);
 999                        if (err < 0)
1000                                return err;
1001                } else {
1002                        WARN_ON_ONCE(1);
1003                }
1004        }
1005
1006        /*
1007         * ignore null lease/binding on snapdir ENOENT, or else we
1008         * will have trouble splicing in the virtual snapdir later
1009         */
1010        if (rinfo->head->is_dentry && !req->r_aborted &&
1011            req->r_locked_dir &&
1012            (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1013                                               fsc->mount_options->snapdir_name,
1014                                               req->r_dentry->d_name.len))) {
1015                /*
1016                 * lookup link rename   : null -> possibly existing inode
1017                 * mknod symlink mkdir  : null -> new inode
1018                 * unlink               : linked -> null
1019                 */
1020                struct inode *dir = req->r_locked_dir;
1021                struct dentry *dn = req->r_dentry;
1022                bool have_dir_cap, have_lease;
1023
1024                BUG_ON(!dn);
1025                BUG_ON(!dir);
1026                BUG_ON(dn->d_parent->d_inode != dir);
1027                BUG_ON(ceph_ino(dir) !=
1028                       le64_to_cpu(rinfo->diri.in->ino));
1029                BUG_ON(ceph_snap(dir) !=
1030                       le64_to_cpu(rinfo->diri.in->snapid));
1031
1032                /* do we have a lease on the whole dir? */
1033                have_dir_cap =
1034                        (le32_to_cpu(rinfo->diri.in->cap.caps) &
1035                         CEPH_CAP_FILE_SHARED);
1036
1037                /* do we have a dn lease? */
1038                have_lease = have_dir_cap ||
1039                        le32_to_cpu(rinfo->dlease->duration_ms);
1040                if (!have_lease)
1041                        dout("fill_trace  no dentry lease or dir cap\n");
1042
1043                /* rename? */
1044                if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1045                        dout(" src %p '%.*s' dst %p '%.*s'\n",
1046                             req->r_old_dentry,
1047                             req->r_old_dentry->d_name.len,
1048                             req->r_old_dentry->d_name.name,
1049                             dn, dn->d_name.len, dn->d_name.name);
1050                        dout("fill_trace doing d_move %p -> %p\n",
1051                             req->r_old_dentry, dn);
1052
1053                        d_move(req->r_old_dentry, dn);
1054                        dout(" src %p '%.*s' dst %p '%.*s'\n",
1055                             req->r_old_dentry,
1056                             req->r_old_dentry->d_name.len,
1057                             req->r_old_dentry->d_name.name,
1058                             dn, dn->d_name.len, dn->d_name.name);
1059
1060                        /* ensure target dentry is invalidated, despite
1061                           rehashing bug in vfs_rename_dir */
1062                        ceph_invalidate_dentry_lease(dn);
1063
1064                        /*
1065                         * d_move() puts the renamed dentry at the end of
1066                         * d_subdirs.  We need to assign it an appropriate
1067                         * directory offset so we can behave when holding
1068                         * D_COMPLETE.
1069                         */
1070                        ceph_set_dentry_offset(req->r_old_dentry);
1071                        dout("dn %p gets new offset %lld\n", req->r_old_dentry, 
1072                             ceph_dentry(req->r_old_dentry)->offset);
1073
1074                        dn = req->r_old_dentry;  /* use old_dentry */
1075                        in = dn->d_inode;
1076                }
1077
1078                /* null dentry? */
1079                if (!rinfo->head->is_target) {
1080                        dout("fill_trace null dentry\n");
1081                        if (dn->d_inode) {
1082                                dout("d_delete %p\n", dn);
1083                                d_delete(dn);
1084                        } else {
1085                                dout("d_instantiate %p NULL\n", dn);
1086                                d_instantiate(dn, NULL);
1087                                if (have_lease && d_unhashed(dn))
1088                                        d_rehash(dn);
1089                                update_dentry_lease(dn, rinfo->dlease,
1090                                                    session,
1091                                                    req->r_request_started);
1092                        }
1093                        goto done;
1094                }
1095
1096                /* attach proper inode */
1097                ininfo = rinfo->targeti.in;
1098                vino.ino = le64_to_cpu(ininfo->ino);
1099                vino.snap = le64_to_cpu(ininfo->snapid);
1100                in = dn->d_inode;
1101                if (!in) {
1102                        in = ceph_get_inode(sb, vino);
1103                        if (IS_ERR(in)) {
1104                                pr_err("fill_trace bad get_inode "
1105                                       "%llx.%llx\n", vino.ino, vino.snap);
1106                                err = PTR_ERR(in);
1107                                d_delete(dn);
1108                                goto done;
1109                        }
1110                        dn = splice_dentry(dn, in, &have_lease, true);
1111                        if (IS_ERR(dn)) {
1112                                err = PTR_ERR(dn);
1113                                goto done;
1114                        }
1115                        req->r_dentry = dn;  /* may have spliced */
1116                        ihold(in);
1117                } else if (ceph_ino(in) == vino.ino &&
1118                           ceph_snap(in) == vino.snap) {
1119                        ihold(in);
1120                } else {
1121                        dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1122                             dn, in, ceph_ino(in), ceph_snap(in),
1123                             vino.ino, vino.snap);
1124                        have_lease = false;
1125                        in = NULL;
1126                }
1127
1128                if (have_lease)
1129                        update_dentry_lease(dn, rinfo->dlease, session,
1130                                            req->r_request_started);
1131                dout(" final dn %p\n", dn);
1132                i++;
1133        } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1134                   req->r_op == CEPH_MDS_OP_MKSNAP) {
1135                struct dentry *dn = req->r_dentry;
1136
1137                /* fill out a snapdir LOOKUPSNAP dentry */
1138                BUG_ON(!dn);
1139                BUG_ON(!req->r_locked_dir);
1140                BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1141                ininfo = rinfo->targeti.in;
1142                vino.ino = le64_to_cpu(ininfo->ino);
1143                vino.snap = le64_to_cpu(ininfo->snapid);
1144                in = ceph_get_inode(sb, vino);
1145                if (IS_ERR(in)) {
1146                        pr_err("fill_inode get_inode badness %llx.%llx\n",
1147                               vino.ino, vino.snap);
1148                        err = PTR_ERR(in);
1149                        d_delete(dn);
1150                        goto done;
1151                }
1152                dout(" linking snapped dir %p to dn %p\n", in, dn);
1153                dn = splice_dentry(dn, in, NULL, true);
1154                if (IS_ERR(dn)) {
1155                        err = PTR_ERR(dn);
1156                        goto done;
1157                }
1158                req->r_dentry = dn;  /* may have spliced */
1159                ihold(in);
1160                rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1161        }
1162
1163        if (rinfo->head->is_target) {
1164                vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1165                vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1166
1167                if (in == NULL || ceph_ino(in) != vino.ino ||
1168                    ceph_snap(in) != vino.snap) {
1169                        in = ceph_get_inode(sb, vino);
1170                        if (IS_ERR(in)) {
1171                                err = PTR_ERR(in);
1172                                goto done;
1173                        }
1174                }
1175                req->r_target_inode = in;
1176
1177                err = fill_inode(in,
1178                                 &rinfo->targeti, NULL,
1179                                 session, req->r_request_started,
1180                                 (le32_to_cpu(rinfo->head->result) == 0) ?
1181                                 req->r_fmode : -1,
1182                                 &req->r_caps_reservation);
1183                if (err < 0) {
1184                        pr_err("fill_inode badness %p %llx.%llx\n",
1185                               in, ceph_vinop(in));
1186                        goto done;
1187                }
1188        }
1189
1190done:
1191        dout("fill_trace done err=%d\n", err);
1192        return err;
1193}
1194
1195/*
1196 * Prepopulate our cache with readdir results, leases, etc.
1197 */
1198int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1199                             struct ceph_mds_session *session)
1200{
1201        struct dentry *parent = req->r_dentry;
1202        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1203        struct qstr dname;
1204        struct dentry *dn;
1205        struct inode *in;
1206        int err = 0, i;
1207        struct inode *snapdir = NULL;
1208        struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1209        u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1210        struct ceph_dentry_info *di;
1211
1212        if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1213                snapdir = ceph_get_snapdir(parent->d_inode);
1214                parent = d_find_alias(snapdir);
1215                dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1216                     rinfo->dir_nr, parent);
1217        } else {
1218                dout("readdir_prepopulate %d items under dn %p\n",
1219                     rinfo->dir_nr, parent);
1220                if (rinfo->dir_dir)
1221                        ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1222        }
1223
1224        for (i = 0; i < rinfo->dir_nr; i++) {
1225                struct ceph_vino vino;
1226
1227                dname.name = rinfo->dir_dname[i];
1228                dname.len = rinfo->dir_dname_len[i];
1229                dname.hash = full_name_hash(dname.name, dname.len);
1230
1231                vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1232                vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1233
1234retry_lookup:
1235                dn = d_lookup(parent, &dname);
1236                dout("d_lookup on parent=%p name=%.*s got %p\n",
1237                     parent, dname.len, dname.name, dn);
1238
1239                if (!dn) {
1240                        dn = d_alloc(parent, &dname);
1241                        dout("d_alloc %p '%.*s' = %p\n", parent,
1242                             dname.len, dname.name, dn);
1243                        if (dn == NULL) {
1244                                dout("d_alloc badness\n");
1245                                err = -ENOMEM;
1246                                goto out;
1247                        }
1248                        err = ceph_init_dentry(dn);
1249                        if (err < 0) {
1250                                dput(dn);
1251                                goto out;
1252                        }
1253                } else if (dn->d_inode &&
1254                           (ceph_ino(dn->d_inode) != vino.ino ||
1255                            ceph_snap(dn->d_inode) != vino.snap)) {
1256                        dout(" dn %p points to wrong inode %p\n",
1257                             dn, dn->d_inode);
1258                        d_delete(dn);
1259                        dput(dn);
1260                        goto retry_lookup;
1261                } else {
1262                        /* reorder parent's d_subdirs */
1263                        spin_lock(&parent->d_lock);
1264                        spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1265                        list_move(&dn->d_u.d_child, &parent->d_subdirs);
1266                        spin_unlock(&dn->d_lock);
1267                        spin_unlock(&parent->d_lock);
1268                }
1269
1270                di = dn->d_fsdata;
1271                di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1272
1273                /* inode */
1274                if (dn->d_inode) {
1275                        in = dn->d_inode;
1276                } else {
1277                        in = ceph_get_inode(parent->d_sb, vino);
1278                        if (IS_ERR(in)) {
1279                                dout("new_inode badness\n");
1280                                d_delete(dn);
1281                                dput(dn);
1282                                err = PTR_ERR(in);
1283                                goto out;
1284                        }
1285                        dn = splice_dentry(dn, in, NULL, false);
1286                        if (IS_ERR(dn))
1287                                dn = NULL;
1288                }
1289
1290                if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1291                               req->r_request_started, -1,
1292                               &req->r_caps_reservation) < 0) {
1293                        pr_err("fill_inode badness on %p\n", in);
1294                        goto next_item;
1295                }
1296                if (dn)
1297                        update_dentry_lease(dn, rinfo->dir_dlease[i],
1298                                            req->r_session,
1299                                            req->r_request_started);
1300next_item:
1301                if (dn)
1302                        dput(dn);
1303        }
1304        req->r_did_prepopulate = true;
1305
1306out:
1307        if (snapdir) {
1308                iput(snapdir);
1309                dput(parent);
1310        }
1311        dout("readdir_prepopulate done\n");
1312        return err;
1313}
1314
1315int ceph_inode_set_size(struct inode *inode, loff_t size)
1316{
1317        struct ceph_inode_info *ci = ceph_inode(inode);
1318        int ret = 0;
1319
1320        spin_lock(&ci->i_ceph_lock);
1321        dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1322        inode->i_size = size;
1323        inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1324
1325        /* tell the MDS if we are approaching max_size */
1326        if ((size << 1) >= ci->i_max_size &&
1327            (ci->i_reported_size << 1) < ci->i_max_size)
1328                ret = 1;
1329
1330        spin_unlock(&ci->i_ceph_lock);
1331        return ret;
1332}
1333
1334/*
1335 * Write back inode data in a worker thread.  (This can't be done
1336 * in the message handler context.)
1337 */
1338void ceph_queue_writeback(struct inode *inode)
1339{
1340        ihold(inode);
1341        if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1342                       &ceph_inode(inode)->i_wb_work)) {
1343                dout("ceph_queue_writeback %p\n", inode);
1344        } else {
1345                dout("ceph_queue_writeback %p failed\n", inode);
1346                iput(inode);
1347        }
1348}
1349
1350static void ceph_writeback_work(struct work_struct *work)
1351{
1352        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1353                                                  i_wb_work);
1354        struct inode *inode = &ci->vfs_inode;
1355
1356        dout("writeback %p\n", inode);
1357        filemap_fdatawrite(&inode->i_data);
1358        iput(inode);
1359}
1360
1361/*
1362 * queue an async invalidation
1363 */
1364void ceph_queue_invalidate(struct inode *inode)
1365{
1366        ihold(inode);
1367        if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1368                       &ceph_inode(inode)->i_pg_inv_work)) {
1369                dout("ceph_queue_invalidate %p\n", inode);
1370        } else {
1371                dout("ceph_queue_invalidate %p failed\n", inode);
1372                iput(inode);
1373        }
1374}
1375
1376/*
1377 * Invalidate inode pages in a worker thread.  (This can't be done
1378 * in the message handler context.)
1379 */
1380static void ceph_invalidate_work(struct work_struct *work)
1381{
1382        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1383                                                  i_pg_inv_work);
1384        struct inode *inode = &ci->vfs_inode;
1385        u32 orig_gen;
1386        int check = 0;
1387
1388        spin_lock(&ci->i_ceph_lock);
1389        dout("invalidate_pages %p gen %d revoking %d\n", inode,
1390             ci->i_rdcache_gen, ci->i_rdcache_revoking);
1391        if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1392                /* nevermind! */
1393                spin_unlock(&ci->i_ceph_lock);
1394                goto out;
1395        }
1396        orig_gen = ci->i_rdcache_gen;
1397        spin_unlock(&ci->i_ceph_lock);
1398
1399        truncate_inode_pages(&inode->i_data, 0);
1400
1401        spin_lock(&ci->i_ceph_lock);
1402        if (orig_gen == ci->i_rdcache_gen &&
1403            orig_gen == ci->i_rdcache_revoking) {
1404                dout("invalidate_pages %p gen %d successful\n", inode,
1405                     ci->i_rdcache_gen);
1406                ci->i_rdcache_revoking--;
1407                check = 1;
1408        } else {
1409                dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1410                     inode, orig_gen, ci->i_rdcache_gen,
1411                     ci->i_rdcache_revoking);
1412        }
1413        spin_unlock(&ci->i_ceph_lock);
1414
1415        if (check)
1416                ceph_check_caps(ci, 0, NULL);
1417out:
1418        iput(inode);
1419}
1420
1421
1422/*
1423 * called by trunc_wq; take i_mutex ourselves
1424 *
1425 * We also truncate in a separate thread as well.
1426 */
1427static void ceph_vmtruncate_work(struct work_struct *work)
1428{
1429        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1430                                                  i_vmtruncate_work);
1431        struct inode *inode = &ci->vfs_inode;
1432
1433        dout("vmtruncate_work %p\n", inode);
1434        mutex_lock(&inode->i_mutex);
1435        __ceph_do_pending_vmtruncate(inode);
1436        mutex_unlock(&inode->i_mutex);
1437        iput(inode);
1438}
1439
1440/*
1441 * Queue an async vmtruncate.  If we fail to queue work, we will handle
1442 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1443 */
1444void ceph_queue_vmtruncate(struct inode *inode)
1445{
1446        struct ceph_inode_info *ci = ceph_inode(inode);
1447
1448        ihold(inode);
1449        if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1450                       &ci->i_vmtruncate_work)) {
1451                dout("ceph_queue_vmtruncate %p\n", inode);
1452        } else {
1453                dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1454                     inode, ci->i_truncate_pending);
1455                iput(inode);
1456        }
1457}
1458
1459/*
1460 * called with i_mutex held.
1461 *
1462 * Make sure any pending truncation is applied before doing anything
1463 * that may depend on it.
1464 */
1465void __ceph_do_pending_vmtruncate(struct inode *inode)
1466{
1467        struct ceph_inode_info *ci = ceph_inode(inode);
1468        u64 to;
1469        int wrbuffer_refs, wake = 0;
1470
1471retry:
1472        spin_lock(&ci->i_ceph_lock);
1473        if (ci->i_truncate_pending == 0) {
1474                dout("__do_pending_vmtruncate %p none pending\n", inode);
1475                spin_unlock(&ci->i_ceph_lock);
1476                return;
1477        }
1478
1479        /*
1480         * make sure any dirty snapped pages are flushed before we
1481         * possibly truncate them.. so write AND block!
1482         */
1483        if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1484                dout("__do_pending_vmtruncate %p flushing snaps first\n",
1485                     inode);
1486                spin_unlock(&ci->i_ceph_lock);
1487                filemap_write_and_wait_range(&inode->i_data, 0,
1488                                             inode->i_sb->s_maxbytes);
1489                goto retry;
1490        }
1491
1492        to = ci->i_truncate_size;
1493        wrbuffer_refs = ci->i_wrbuffer_ref;
1494        dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1495             ci->i_truncate_pending, to);
1496        spin_unlock(&ci->i_ceph_lock);
1497
1498        truncate_inode_pages(inode->i_mapping, to);
1499
1500        spin_lock(&ci->i_ceph_lock);
1501        ci->i_truncate_pending--;
1502        if (ci->i_truncate_pending == 0)
1503                wake = 1;
1504        spin_unlock(&ci->i_ceph_lock);
1505
1506        if (wrbuffer_refs == 0)
1507                ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1508        if (wake)
1509                wake_up_all(&ci->i_cap_wq);
1510}
1511
1512
1513/*
1514 * symlinks
1515 */
1516static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1517{
1518        struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1519        nd_set_link(nd, ci->i_symlink);
1520        return NULL;
1521}
1522
1523static const struct inode_operations ceph_symlink_iops = {
1524        .readlink = generic_readlink,
1525        .follow_link = ceph_sym_follow_link,
1526};
1527
1528/*
1529 * setattr
1530 */
1531int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1532{
1533        struct inode *inode = dentry->d_inode;
1534        struct ceph_inode_info *ci = ceph_inode(inode);
1535        struct inode *parent_inode;
1536        const unsigned int ia_valid = attr->ia_valid;
1537        struct ceph_mds_request *req;
1538        struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1539        int issued;
1540        int release = 0, dirtied = 0;
1541        int mask = 0;
1542        int err = 0;
1543        int inode_dirty_flags = 0;
1544
1545        if (ceph_snap(inode) != CEPH_NOSNAP)
1546                return -EROFS;
1547
1548        __ceph_do_pending_vmtruncate(inode);
1549
1550        err = inode_change_ok(inode, attr);
1551        if (err != 0)
1552                return err;
1553
1554        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1555                                       USE_AUTH_MDS);
1556        if (IS_ERR(req))
1557                return PTR_ERR(req);
1558
1559        spin_lock(&ci->i_ceph_lock);
1560        issued = __ceph_caps_issued(ci, NULL);
1561        dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1562
1563        if (ia_valid & ATTR_UID) {
1564                dout("setattr %p uid %d -> %d\n", inode,
1565                     inode->i_uid, attr->ia_uid);
1566                if (issued & CEPH_CAP_AUTH_EXCL) {
1567                        inode->i_uid = attr->ia_uid;
1568                        dirtied |= CEPH_CAP_AUTH_EXCL;
1569                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1570                           attr->ia_uid != inode->i_uid) {
1571                        req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1572                        mask |= CEPH_SETATTR_UID;
1573                        release |= CEPH_CAP_AUTH_SHARED;
1574                }
1575        }
1576        if (ia_valid & ATTR_GID) {
1577                dout("setattr %p gid %d -> %d\n", inode,
1578                     inode->i_gid, attr->ia_gid);
1579                if (issued & CEPH_CAP_AUTH_EXCL) {
1580                        inode->i_gid = attr->ia_gid;
1581                        dirtied |= CEPH_CAP_AUTH_EXCL;
1582                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1583                           attr->ia_gid != inode->i_gid) {
1584                        req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1585                        mask |= CEPH_SETATTR_GID;
1586                        release |= CEPH_CAP_AUTH_SHARED;
1587                }
1588        }
1589        if (ia_valid & ATTR_MODE) {
1590                dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1591                     attr->ia_mode);
1592                if (issued & CEPH_CAP_AUTH_EXCL) {
1593                        inode->i_mode = attr->ia_mode;
1594                        dirtied |= CEPH_CAP_AUTH_EXCL;
1595                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1596                           attr->ia_mode != inode->i_mode) {
1597                        req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1598                        mask |= CEPH_SETATTR_MODE;
1599                        release |= CEPH_CAP_AUTH_SHARED;
1600                }
1601        }
1602
1603        if (ia_valid & ATTR_ATIME) {
1604                dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1605                     inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1606                     attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1607                if (issued & CEPH_CAP_FILE_EXCL) {
1608                        ci->i_time_warp_seq++;
1609                        inode->i_atime = attr->ia_atime;
1610                        dirtied |= CEPH_CAP_FILE_EXCL;
1611                } else if ((issued & CEPH_CAP_FILE_WR) &&
1612                           timespec_compare(&inode->i_atime,
1613                                            &attr->ia_atime) < 0) {
1614                        inode->i_atime = attr->ia_atime;
1615                        dirtied |= CEPH_CAP_FILE_WR;
1616                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1617                           !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1618                        ceph_encode_timespec(&req->r_args.setattr.atime,
1619                                             &attr->ia_atime);
1620                        mask |= CEPH_SETATTR_ATIME;
1621                        release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1622                                CEPH_CAP_FILE_WR;
1623                }
1624        }
1625        if (ia_valid & ATTR_MTIME) {
1626                dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1627                     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1628                     attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1629                if (issued & CEPH_CAP_FILE_EXCL) {
1630                        ci->i_time_warp_seq++;
1631                        inode->i_mtime = attr->ia_mtime;
1632                        dirtied |= CEPH_CAP_FILE_EXCL;
1633                } else if ((issued & CEPH_CAP_FILE_WR) &&
1634                           timespec_compare(&inode->i_mtime,
1635                                            &attr->ia_mtime) < 0) {
1636                        inode->i_mtime = attr->ia_mtime;
1637                        dirtied |= CEPH_CAP_FILE_WR;
1638                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1639                           !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1640                        ceph_encode_timespec(&req->r_args.setattr.mtime,
1641                                             &attr->ia_mtime);
1642                        mask |= CEPH_SETATTR_MTIME;
1643                        release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1644                                CEPH_CAP_FILE_WR;
1645                }
1646        }
1647        if (ia_valid & ATTR_SIZE) {
1648                dout("setattr %p size %lld -> %lld\n", inode,
1649                     inode->i_size, attr->ia_size);
1650                if (attr->ia_size > inode->i_sb->s_maxbytes) {
1651                        err = -EINVAL;
1652                        goto out;
1653                }
1654                if ((issued & CEPH_CAP_FILE_EXCL) &&
1655                    attr->ia_size > inode->i_size) {
1656                        inode->i_size = attr->ia_size;
1657                        inode->i_blocks =
1658                                (attr->ia_size + (1 << 9) - 1) >> 9;
1659                        inode->i_ctime = attr->ia_ctime;
1660                        ci->i_reported_size = attr->ia_size;
1661                        dirtied |= CEPH_CAP_FILE_EXCL;
1662                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1663                           attr->ia_size != inode->i_size) {
1664                        req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1665                        req->r_args.setattr.old_size =
1666                                cpu_to_le64(inode->i_size);
1667                        mask |= CEPH_SETATTR_SIZE;
1668                        release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1669                                CEPH_CAP_FILE_WR;
1670                }
1671        }
1672
1673        /* these do nothing */
1674        if (ia_valid & ATTR_CTIME) {
1675                bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1676                                         ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1677                dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1678                     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1679                     attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1680                     only ? "ctime only" : "ignored");
1681                inode->i_ctime = attr->ia_ctime;
1682                if (only) {
1683                        /*
1684                         * if kernel wants to dirty ctime but nothing else,
1685                         * we need to choose a cap to dirty under, or do
1686                         * a almost-no-op setattr
1687                         */
1688                        if (issued & CEPH_CAP_AUTH_EXCL)
1689                                dirtied |= CEPH_CAP_AUTH_EXCL;
1690                        else if (issued & CEPH_CAP_FILE_EXCL)
1691                                dirtied |= CEPH_CAP_FILE_EXCL;
1692                        else if (issued & CEPH_CAP_XATTR_EXCL)
1693                                dirtied |= CEPH_CAP_XATTR_EXCL;
1694                        else
1695                                mask |= CEPH_SETATTR_CTIME;
1696                }
1697        }
1698        if (ia_valid & ATTR_FILE)
1699                dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1700
1701        if (dirtied) {
1702                inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1703                inode->i_ctime = CURRENT_TIME;
1704        }
1705
1706        release &= issued;
1707        spin_unlock(&ci->i_ceph_lock);
1708
1709        if (inode_dirty_flags)
1710                __mark_inode_dirty(inode, inode_dirty_flags);
1711
1712        if (mask) {
1713                req->r_inode = inode;
1714                ihold(inode);
1715                req->r_inode_drop = release;
1716                req->r_args.setattr.mask = cpu_to_le32(mask);
1717                req->r_num_caps = 1;
1718                parent_inode = ceph_get_dentry_parent_inode(dentry);
1719                err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1720                iput(parent_inode);
1721        }
1722        dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1723             ceph_cap_string(dirtied), mask);
1724
1725        ceph_mdsc_put_request(req);
1726        __ceph_do_pending_vmtruncate(inode);
1727        return err;
1728out:
1729        spin_unlock(&ci->i_ceph_lock);
1730        ceph_mdsc_put_request(req);
1731        return err;
1732}
1733
1734/*
1735 * Verify that we have a lease on the given mask.  If not,
1736 * do a getattr against an mds.
1737 */
1738int ceph_do_getattr(struct inode *inode, int mask)
1739{
1740        struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1741        struct ceph_mds_client *mdsc = fsc->mdsc;
1742        struct ceph_mds_request *req;
1743        int err;
1744
1745        if (ceph_snap(inode) == CEPH_SNAPDIR) {
1746                dout("do_getattr inode %p SNAPDIR\n", inode);
1747                return 0;
1748        }
1749
1750        dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1751        if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1752                return 0;
1753
1754        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1755        if (IS_ERR(req))
1756                return PTR_ERR(req);
1757        req->r_inode = inode;
1758        ihold(inode);
1759        req->r_num_caps = 1;
1760        req->r_args.getattr.mask = cpu_to_le32(mask);
1761        err = ceph_mdsc_do_request(mdsc, NULL, req);
1762        ceph_mdsc_put_request(req);
1763        dout("do_getattr result=%d\n", err);
1764        return err;
1765}
1766
1767
1768/*
1769 * Check inode permissions.  We verify we have a valid value for
1770 * the AUTH cap, then call the generic handler.
1771 */
1772int ceph_permission(struct inode *inode, int mask)
1773{
1774        int err;
1775
1776        if (mask & MAY_NOT_BLOCK)
1777                return -ECHILD;
1778
1779        err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1780
1781        if (!err)
1782                err = generic_permission(inode, mask);
1783        return err;
1784}
1785
1786/*
1787 * Get all attributes.  Hopefully somedata we'll have a statlite()
1788 * and can limit the fields we require to be accurate.
1789 */
1790int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1791                 struct kstat *stat)
1792{
1793        struct inode *inode = dentry->d_inode;
1794        struct ceph_inode_info *ci = ceph_inode(inode);
1795        int err;
1796
1797        err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1798        if (!err) {
1799                generic_fillattr(inode, stat);
1800                stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1801                if (ceph_snap(inode) != CEPH_NOSNAP)
1802                        stat->dev = ceph_snap(inode);
1803                else
1804                        stat->dev = 0;
1805                if (S_ISDIR(inode->i_mode)) {
1806                        if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1807                                                RBYTES))
1808                                stat->size = ci->i_rbytes;
1809                        else
1810                                stat->size = ci->i_files + ci->i_subdirs;
1811                        stat->blocks = 0;
1812                        stat->blksize = 65536;
1813                }
1814        }
1815        return err;
1816}
1817
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