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        atomic_set(&ci->i_release_count, 1);
 306        atomic_set(&ci->i_complete_count, 0);
 307        ci->i_symlink = NULL;
 308
 309        memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 310
 311        ci->i_fragtree = RB_ROOT;
 312        mutex_init(&ci->i_fragtree_mutex);
 313
 314        ci->i_xattrs.blob = NULL;
 315        ci->i_xattrs.prealloc_blob = NULL;
 316        ci->i_xattrs.dirty = false;
 317        ci->i_xattrs.index = RB_ROOT;
 318        ci->i_xattrs.count = 0;
 319        ci->i_xattrs.names_size = 0;
 320        ci->i_xattrs.vals_size = 0;
 321        ci->i_xattrs.version = 0;
 322        ci->i_xattrs.index_version = 0;
 323
 324        ci->i_caps = RB_ROOT;
 325        ci->i_auth_cap = NULL;
 326        ci->i_dirty_caps = 0;
 327        ci->i_flushing_caps = 0;
 328        INIT_LIST_HEAD(&ci->i_dirty_item);
 329        INIT_LIST_HEAD(&ci->i_flushing_item);
 330        ci->i_cap_flush_seq = 0;
 331        ci->i_cap_flush_last_tid = 0;
 332        memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 333        init_waitqueue_head(&ci->i_cap_wq);
 334        ci->i_hold_caps_min = 0;
 335        ci->i_hold_caps_max = 0;
 336        INIT_LIST_HEAD(&ci->i_cap_delay_list);
 337        ci->i_cap_exporting_mds = 0;
 338        ci->i_cap_exporting_mseq = 0;
 339        ci->i_cap_exporting_issued = 0;
 340        INIT_LIST_HEAD(&ci->i_cap_snaps);
 341        ci->i_head_snapc = NULL;
 342        ci->i_snap_caps = 0;
 343
 344        for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 345                ci->i_nr_by_mode[i] = 0;
 346
 347        ci->i_truncate_seq = 0;
 348        ci->i_truncate_size = 0;
 349        ci->i_truncate_pending = 0;
 350
 351        ci->i_max_size = 0;
 352        ci->i_reported_size = 0;
 353        ci->i_wanted_max_size = 0;
 354        ci->i_requested_max_size = 0;
 355
 356        ci->i_pin_ref = 0;
 357        ci->i_rd_ref = 0;
 358        ci->i_rdcache_ref = 0;
 359        ci->i_wr_ref = 0;
 360        ci->i_wb_ref = 0;
 361        ci->i_wrbuffer_ref = 0;
 362        ci->i_wrbuffer_ref_head = 0;
 363        ci->i_shared_gen = 0;
 364        ci->i_rdcache_gen = 0;
 365        ci->i_rdcache_revoking = 0;
 366
 367        INIT_LIST_HEAD(&ci->i_unsafe_writes);
 368        INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 369        spin_lock_init(&ci->i_unsafe_lock);
 370
 371        ci->i_snap_realm = NULL;
 372        INIT_LIST_HEAD(&ci->i_snap_realm_item);
 373        INIT_LIST_HEAD(&ci->i_snap_flush_item);
 374
 375        INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 376        INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 377
 378        INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 379
 380        return &ci->vfs_inode;
 381}
 382
 383static void ceph_i_callback(struct rcu_head *head)
 384{
 385        struct inode *inode = container_of(head, struct inode, i_rcu);
 386        struct ceph_inode_info *ci = ceph_inode(inode);
 387
 388        kmem_cache_free(ceph_inode_cachep, ci);
 389}
 390
 391void ceph_destroy_inode(struct inode *inode)
 392{
 393        struct ceph_inode_info *ci = ceph_inode(inode);
 394        struct ceph_inode_frag *frag;
 395        struct rb_node *n;
 396
 397        dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 398
 399        ceph_queue_caps_release(inode);
 400
 401        /*
 402         * we may still have a snap_realm reference if there are stray
 403         * caps in i_cap_exporting_issued or i_snap_caps.
 404         */
 405        if (ci->i_snap_realm) {
 406                struct ceph_mds_client *mdsc =
 407                        ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 408                struct ceph_snap_realm *realm = ci->i_snap_realm;
 409
 410                dout(" dropping residual ref to snap realm %p\n", realm);
 411                spin_lock(&realm->inodes_with_caps_lock);
 412                list_del_init(&ci->i_snap_realm_item);
 413                spin_unlock(&realm->inodes_with_caps_lock);
 414                ceph_put_snap_realm(mdsc, realm);
 415        }
 416
 417        kfree(ci->i_symlink);
 418        while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 419                frag = rb_entry(n, struct ceph_inode_frag, node);
 420                rb_erase(n, &ci->i_fragtree);
 421                kfree(frag);
 422        }
 423
 424        __ceph_destroy_xattrs(ci);
 425        if (ci->i_xattrs.blob)
 426                ceph_buffer_put(ci->i_xattrs.blob);
 427        if (ci->i_xattrs.prealloc_blob)
 428                ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 429
 430        call_rcu(&inode->i_rcu, ceph_i_callback);
 431}
 432
 433
 434/*
 435 * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 436 * careful because either the client or MDS may have more up to date
 437 * info, depending on which capabilities are held, and whether
 438 * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 439 * and size are monotonically increasing, except when utimes() or
 440 * truncate() increments the corresponding _seq values.)
 441 */
 442int ceph_fill_file_size(struct inode *inode, int issued,
 443                        u32 truncate_seq, u64 truncate_size, u64 size)
 444{
 445        struct ceph_inode_info *ci = ceph_inode(inode);
 446        int queue_trunc = 0;
 447
 448        if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 449            (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 450                dout("size %lld -> %llu\n", inode->i_size, size);
 451                inode->i_size = size;
 452                inode->i_blocks = (size + (1<<9) - 1) >> 9;
 453                ci->i_reported_size = size;
 454                if (truncate_seq != ci->i_truncate_seq) {
 455                        dout("truncate_seq %u -> %u\n",
 456                             ci->i_truncate_seq, truncate_seq);
 457                        ci->i_truncate_seq = truncate_seq;
 458                        /*
 459                         * If we hold relevant caps, or in the case where we're
 460                         * not the only client referencing this file and we
 461                         * don't hold those caps, then we need to check whether
 462                         * the file is either opened or mmaped
 463                         */
 464                        if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 465                                       CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 466                                       CEPH_CAP_FILE_EXCL|
 467                                       CEPH_CAP_FILE_LAZYIO)) ||
 468                            mapping_mapped(inode->i_mapping) ||
 469                            __ceph_caps_file_wanted(ci)) {
 470                                ci->i_truncate_pending++;
 471                                queue_trunc = 1;
 472                        }
 473                }
 474        }
 475        if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 476            ci->i_truncate_size != truncate_size) {
 477                dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 478                     truncate_size);
 479                ci->i_truncate_size = truncate_size;
 480        }
 481        return queue_trunc;
 482}
 483
 484void ceph_fill_file_time(struct inode *inode, int issued,
 485                         u64 time_warp_seq, struct timespec *ctime,
 486                         struct timespec *mtime, struct timespec *atime)
 487{
 488        struct ceph_inode_info *ci = ceph_inode(inode);
 489        int warn = 0;
 490
 491        if (issued & (CEPH_CAP_FILE_EXCL|
 492                      CEPH_CAP_FILE_WR|
 493                      CEPH_CAP_FILE_BUFFER|
 494                      CEPH_CAP_AUTH_EXCL|
 495                      CEPH_CAP_XATTR_EXCL)) {
 496                if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 497                        dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 498                             inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 499                             ctime->tv_sec, ctime->tv_nsec);
 500                        inode->i_ctime = *ctime;
 501                }
 502                if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 503                        /* the MDS did a utimes() */
 504                        dout("mtime %ld.%09ld -> %ld.%09ld "
 505                             "tw %d -> %d\n",
 506                             inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 507                             mtime->tv_sec, mtime->tv_nsec,
 508                             ci->i_time_warp_seq, (int)time_warp_seq);
 509
 510                        inode->i_mtime = *mtime;
 511                        inode->i_atime = *atime;
 512                        ci->i_time_warp_seq = time_warp_seq;
 513                } else if (time_warp_seq == ci->i_time_warp_seq) {
 514                        /* nobody did utimes(); take the max */
 515                        if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 516                                dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 517                                     inode->i_mtime.tv_sec,
 518                                     inode->i_mtime.tv_nsec,
 519                                     mtime->tv_sec, mtime->tv_nsec);
 520                                inode->i_mtime = *mtime;
 521                        }
 522                        if (timespec_compare(atime, &inode->i_atime) > 0) {
 523                                dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 524                                     inode->i_atime.tv_sec,
 525                                     inode->i_atime.tv_nsec,
 526                                     atime->tv_sec, atime->tv_nsec);
 527                                inode->i_atime = *atime;
 528                        }
 529                } else if (issued & CEPH_CAP_FILE_EXCL) {
 530                        /* we did a utimes(); ignore mds values */
 531                } else {
 532                        warn = 1;
 533                }
 534        } else {
 535                /* we have no write|excl caps; whatever the MDS says is true */
 536                if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 537                        inode->i_ctime = *ctime;
 538                        inode->i_mtime = *mtime;
 539                        inode->i_atime = *atime;
 540                        ci->i_time_warp_seq = time_warp_seq;
 541                } else {
 542                        warn = 1;
 543                }
 544        }
 545        if (warn) /* time_warp_seq shouldn't go backwards */
 546                dout("%p mds time_warp_seq %llu < %u\n",
 547                     inode, time_warp_seq, ci->i_time_warp_seq);
 548}
 549
 550/*
 551 * Populate an inode based on info from mds.  May be called on new or
 552 * existing inodes.
 553 */
 554static int fill_inode(struct inode *inode,
 555                      struct ceph_mds_reply_info_in *iinfo,
 556                      struct ceph_mds_reply_dirfrag *dirinfo,
 557                      struct ceph_mds_session *session,
 558                      unsigned long ttl_from, int cap_fmode,
 559                      struct ceph_cap_reservation *caps_reservation)
 560{
 561        struct ceph_mds_reply_inode *info = iinfo->in;
 562        struct ceph_inode_info *ci = ceph_inode(inode);
 563        int i;
 564        int issued = 0, implemented;
 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        issued = __ceph_caps_issued(ci, &implemented);
 605        issued |= implemented | __ceph_caps_dirty(ci);
 606
 607        /* update inode */
 608        ci->i_version = le64_to_cpu(info->version);
 609        inode->i_version++;
 610        inode->i_rdev = le32_to_cpu(info->rdev);
 611
 612        if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 613                inode->i_mode = le32_to_cpu(info->mode);
 614                inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 615                inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 616                dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 617                     from_kuid(&init_user_ns, inode->i_uid),
 618                     from_kgid(&init_user_ns, 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
 719        /* set dir completion flag? */
 720        if (S_ISDIR(inode->i_mode) &&
 721            ci->i_files == 0 && ci->i_subdirs == 0 &&
 722            ceph_snap(inode) == CEPH_NOSNAP &&
 723            (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 724            (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 725            !__ceph_dir_is_complete(ci)) {
 726                dout(" marking %p complete (empty)\n", inode);
 727                __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
 728                ci->i_max_offset = 2;
 729        }
 730no_change:
 731        spin_unlock(&ci->i_ceph_lock);
 732
 733        /* queue truncate if we saw i_size decrease */
 734        if (queue_trunc)
 735                ceph_queue_vmtruncate(inode);
 736
 737        /* populate frag tree */
 738        /* FIXME: move me up, if/when version reflects fragtree changes */
 739        nsplits = le32_to_cpu(info->fragtree.nsplits);
 740        mutex_lock(&ci->i_fragtree_mutex);
 741        for (i = 0; i < nsplits; i++) {
 742                u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 743                struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 744
 745                if (IS_ERR(frag))
 746                        continue;
 747                frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 748                dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 749        }
 750        mutex_unlock(&ci->i_fragtree_mutex);
 751
 752        /* were we issued a capability? */
 753        if (info->cap.caps) {
 754                if (ceph_snap(inode) == CEPH_NOSNAP) {
 755                        ceph_add_cap(inode, session,
 756                                     le64_to_cpu(info->cap.cap_id),
 757                                     cap_fmode,
 758                                     le32_to_cpu(info->cap.caps),
 759                                     le32_to_cpu(info->cap.wanted),
 760                                     le32_to_cpu(info->cap.seq),
 761                                     le32_to_cpu(info->cap.mseq),
 762                                     le64_to_cpu(info->cap.realm),
 763                                     info->cap.flags,
 764                                     caps_reservation);
 765                } else {
 766                        spin_lock(&ci->i_ceph_lock);
 767                        dout(" %p got snap_caps %s\n", inode,
 768                             ceph_cap_string(le32_to_cpu(info->cap.caps)));
 769                        ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 770                        if (cap_fmode >= 0)
 771                                __ceph_get_fmode(ci, cap_fmode);
 772                        spin_unlock(&ci->i_ceph_lock);
 773                }
 774        } else if (cap_fmode >= 0) {
 775                pr_warning("mds issued no caps on %llx.%llx\n",
 776                           ceph_vinop(inode));
 777                __ceph_get_fmode(ci, cap_fmode);
 778        }
 779
 780        /* update delegation info? */
 781        if (dirinfo)
 782                ceph_fill_dirfrag(inode, dirinfo);
 783
 784        err = 0;
 785
 786out:
 787        if (xattr_blob)
 788                ceph_buffer_put(xattr_blob);
 789        return err;
 790}
 791
 792/*
 793 * caller should hold session s_mutex.
 794 */
 795static void update_dentry_lease(struct dentry *dentry,
 796                                struct ceph_mds_reply_lease *lease,
 797                                struct ceph_mds_session *session,
 798                                unsigned long from_time)
 799{
 800        struct ceph_dentry_info *di = ceph_dentry(dentry);
 801        long unsigned duration = le32_to_cpu(lease->duration_ms);
 802        long unsigned ttl = from_time + (duration * HZ) / 1000;
 803        long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 804        struct inode *dir;
 805
 806        /* only track leases on regular dentries */
 807        if (dentry->d_op != &ceph_dentry_ops)
 808                return;
 809
 810        spin_lock(&dentry->d_lock);
 811        dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 812             dentry, duration, ttl);
 813
 814        /* make lease_rdcache_gen match directory */
 815        dir = dentry->d_parent->d_inode;
 816        di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 817
 818        if (duration == 0)
 819                goto out_unlock;
 820
 821        if (di->lease_gen == session->s_cap_gen &&
 822            time_before(ttl, dentry->d_time))
 823                goto out_unlock;  /* we already have a newer lease. */
 824
 825        if (di->lease_session && di->lease_session != session)
 826                goto out_unlock;
 827
 828        ceph_dentry_lru_touch(dentry);
 829
 830        if (!di->lease_session)
 831                di->lease_session = ceph_get_mds_session(session);
 832        di->lease_gen = session->s_cap_gen;
 833        di->lease_seq = le32_to_cpu(lease->seq);
 834        di->lease_renew_after = half_ttl;
 835        di->lease_renew_from = 0;
 836        dentry->d_time = ttl;
 837out_unlock:
 838        spin_unlock(&dentry->d_lock);
 839        return;
 840}
 841
 842/*
 843 * Set dentry's directory position based on the current dir's max, and
 844 * order it in d_subdirs, so that dcache_readdir behaves.
 845 *
 846 * Always called under directory's i_mutex.
 847 */
 848static void ceph_set_dentry_offset(struct dentry *dn)
 849{
 850        struct dentry *dir = dn->d_parent;
 851        struct inode *inode = dir->d_inode;
 852        struct ceph_inode_info *ci;
 853        struct ceph_dentry_info *di;
 854
 855        BUG_ON(!inode);
 856
 857        ci = ceph_inode(inode);
 858        di = ceph_dentry(dn);
 859
 860        spin_lock(&ci->i_ceph_lock);
 861        if (!__ceph_dir_is_complete(ci)) {
 862                spin_unlock(&ci->i_ceph_lock);
 863                return;
 864        }
 865        di->offset = ceph_inode(inode)->i_max_offset++;
 866        spin_unlock(&ci->i_ceph_lock);
 867
 868        spin_lock(&dir->d_lock);
 869        spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 870        list_move(&dn->d_u.d_child, &dir->d_subdirs);
 871        dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 872             dn->d_u.d_child.prev, dn->d_u.d_child.next);
 873        spin_unlock(&dn->d_lock);
 874        spin_unlock(&dir->d_lock);
 875}
 876
 877/*
 878 * splice a dentry to an inode.
 879 * caller must hold directory i_mutex for this to be safe.
 880 *
 881 * we will only rehash the resulting dentry if @prehash is
 882 * true; @prehash will be set to false (for the benefit of
 883 * the caller) if we fail.
 884 */
 885static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 886                                    bool *prehash, bool set_offset)
 887{
 888        struct dentry *realdn;
 889
 890        BUG_ON(dn->d_inode);
 891
 892        /* dn must be unhashed */
 893        if (!d_unhashed(dn))
 894                d_drop(dn);
 895        realdn = d_materialise_unique(dn, in);
 896        if (IS_ERR(realdn)) {
 897                pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 898                       PTR_ERR(realdn), dn, in, ceph_vinop(in));
 899                if (prehash)
 900                        *prehash = false; /* don't rehash on error */
 901                dn = realdn; /* note realdn contains the error */
 902                goto out;
 903        } else if (realdn) {
 904                dout("dn %p (%d) spliced with %p (%d) "
 905                     "inode %p ino %llx.%llx\n",
 906                     dn, d_count(dn),
 907                     realdn, d_count(realdn),
 908                     realdn->d_inode, ceph_vinop(realdn->d_inode));
 909                dput(dn);
 910                dn = realdn;
 911        } else {
 912                BUG_ON(!ceph_dentry(dn));
 913                dout("dn %p attached to %p ino %llx.%llx\n",
 914                     dn, dn->d_inode, ceph_vinop(dn->d_inode));
 915        }
 916        if ((!prehash || *prehash) && d_unhashed(dn))
 917                d_rehash(dn);
 918        if (set_offset)
 919                ceph_set_dentry_offset(dn);
 920out:
 921        return dn;
 922}
 923
 924/*
 925 * Incorporate results into the local cache.  This is either just
 926 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 927 * after a lookup).
 928 *
 929 * A reply may contain
 930 *         a directory inode along with a dentry.
 931 *  and/or a target inode
 932 *
 933 * Called with snap_rwsem (read).
 934 */
 935int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 936                    struct ceph_mds_session *session)
 937{
 938        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 939        struct inode *in = NULL;
 940        struct ceph_mds_reply_inode *ininfo;
 941        struct ceph_vino vino;
 942        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 943        int i = 0;
 944        int err = 0;
 945
 946        dout("fill_trace %p is_dentry %d is_target %d\n", req,
 947             rinfo->head->is_dentry, rinfo->head->is_target);
 948
 949#if 0
 950        /*
 951         * Debugging hook:
 952         *
 953         * If we resend completed ops to a recovering mds, we get no
 954         * trace.  Since that is very rare, pretend this is the case
 955         * to ensure the 'no trace' handlers in the callers behave.
 956         *
 957         * Fill in inodes unconditionally to avoid breaking cap
 958         * invariants.
 959         */
 960        if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 961                pr_info("fill_trace faking empty trace on %lld %s\n",
 962                        req->r_tid, ceph_mds_op_name(rinfo->head->op));
 963                if (rinfo->head->is_dentry) {
 964                        rinfo->head->is_dentry = 0;
 965                        err = fill_inode(req->r_locked_dir,
 966                                         &rinfo->diri, rinfo->dirfrag,
 967                                         session, req->r_request_started, -1);
 968                }
 969                if (rinfo->head->is_target) {
 970                        rinfo->head->is_target = 0;
 971                        ininfo = rinfo->targeti.in;
 972                        vino.ino = le64_to_cpu(ininfo->ino);
 973                        vino.snap = le64_to_cpu(ininfo->snapid);
 974                        in = ceph_get_inode(sb, vino);
 975                        err = fill_inode(in, &rinfo->targeti, NULL,
 976                                         session, req->r_request_started,
 977                                         req->r_fmode);
 978                        iput(in);
 979                }
 980        }
 981#endif
 982
 983        if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 984                dout("fill_trace reply is empty!\n");
 985                if (rinfo->head->result == 0 && req->r_locked_dir)
 986                        ceph_invalidate_dir_request(req);
 987                return 0;
 988        }
 989
 990        if (rinfo->head->is_dentry) {
 991                struct inode *dir = req->r_locked_dir;
 992
 993                if (dir) {
 994                        err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 995                                         session, req->r_request_started, -1,
 996                                         &req->r_caps_reservation);
 997                        if (err < 0)
 998                                return err;
 999                } else {
1000                        WARN_ON_ONCE(1);
1001                }
1002        }
1003
1004        /*
1005         * ignore null lease/binding on snapdir ENOENT, or else we
1006         * will have trouble splicing in the virtual snapdir later
1007         */
1008        if (rinfo->head->is_dentry && !req->r_aborted &&
1009            req->r_locked_dir &&
1010            (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1011                                               fsc->mount_options->snapdir_name,
1012                                               req->r_dentry->d_name.len))) {
1013                /*
1014                 * lookup link rename   : null -> possibly existing inode
1015                 * mknod symlink mkdir  : null -> new inode
1016                 * unlink               : linked -> null
1017                 */
1018                struct inode *dir = req->r_locked_dir;
1019                struct dentry *dn = req->r_dentry;
1020                bool have_dir_cap, have_lease;
1021
1022                BUG_ON(!dn);
1023                BUG_ON(!dir);
1024                BUG_ON(dn->d_parent->d_inode != dir);
1025                BUG_ON(ceph_ino(dir) !=
1026                       le64_to_cpu(rinfo->diri.in->ino));
1027                BUG_ON(ceph_snap(dir) !=
1028                       le64_to_cpu(rinfo->diri.in->snapid));
1029
1030                /* do we have a lease on the whole dir? */
1031                have_dir_cap =
1032                        (le32_to_cpu(rinfo->diri.in->cap.caps) &
1033                         CEPH_CAP_FILE_SHARED);
1034
1035                /* do we have a dn lease? */
1036                have_lease = have_dir_cap ||
1037                        le32_to_cpu(rinfo->dlease->duration_ms);
1038                if (!have_lease)
1039                        dout("fill_trace  no dentry lease or dir cap\n");
1040
1041                /* rename? */
1042                if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1043                        dout(" src %p '%.*s' dst %p '%.*s'\n",
1044                             req->r_old_dentry,
1045                             req->r_old_dentry->d_name.len,
1046                             req->r_old_dentry->d_name.name,
1047                             dn, dn->d_name.len, dn->d_name.name);
1048                        dout("fill_trace doing d_move %p -> %p\n",
1049                             req->r_old_dentry, dn);
1050
1051                        d_move(req->r_old_dentry, dn);
1052                        dout(" src %p '%.*s' dst %p '%.*s'\n",
1053                             req->r_old_dentry,
1054                             req->r_old_dentry->d_name.len,
1055                             req->r_old_dentry->d_name.name,
1056                             dn, dn->d_name.len, dn->d_name.name);
1057
1058                        /* ensure target dentry is invalidated, despite
1059                           rehashing bug in vfs_rename_dir */
1060                        ceph_invalidate_dentry_lease(dn);
1061
1062                        /*
1063                         * d_move() puts the renamed dentry at the end of
1064                         * d_subdirs.  We need to assign it an appropriate
1065                         * directory offset so we can behave when dir is
1066                         * complete.
1067                         */
1068                        ceph_set_dentry_offset(req->r_old_dentry);
1069                        dout("dn %p gets new offset %lld\n", req->r_old_dentry, 
1070                             ceph_dentry(req->r_old_dentry)->offset);
1071
1072                        dn = req->r_old_dentry;  /* use old_dentry */
1073                        in = dn->d_inode;
1074                }
1075
1076                /* null dentry? */
1077                if (!rinfo->head->is_target) {
1078                        dout("fill_trace null dentry\n");
1079                        if (dn->d_inode) {
1080                                dout("d_delete %p\n", dn);
1081                                d_delete(dn);
1082                        } else {
1083                                dout("d_instantiate %p NULL\n", dn);
1084                                d_instantiate(dn, NULL);
1085                                if (have_lease && d_unhashed(dn))
1086                                        d_rehash(dn);
1087                                update_dentry_lease(dn, rinfo->dlease,
1088                                                    session,
1089                                                    req->r_request_started);
1090                        }
1091                        goto done;
1092                }
1093
1094                /* attach proper inode */
1095                ininfo = rinfo->targeti.in;
1096                vino.ino = le64_to_cpu(ininfo->ino);
1097                vino.snap = le64_to_cpu(ininfo->snapid);
1098                in = dn->d_inode;
1099                if (!in) {
1100                        in = ceph_get_inode(sb, vino);
1101                        if (IS_ERR(in)) {
1102                                pr_err("fill_trace bad get_inode "
1103                                       "%llx.%llx\n", vino.ino, vino.snap);
1104                                err = PTR_ERR(in);
1105                                d_drop(dn);
1106                                goto done;
1107                        }
1108                        dn = splice_dentry(dn, in, &have_lease, true);
1109                        if (IS_ERR(dn)) {
1110                                err = PTR_ERR(dn);
1111                                goto done;
1112                        }
1113                        req->r_dentry = dn;  /* may have spliced */
1114                        ihold(in);
1115                } else if (ceph_ino(in) == vino.ino &&
1116                           ceph_snap(in) == vino.snap) {
1117                        ihold(in);
1118                } else {
1119                        dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1120                             dn, in, ceph_ino(in), ceph_snap(in),
1121                             vino.ino, vino.snap);
1122                        have_lease = false;
1123                        in = NULL;
1124                }
1125
1126                if (have_lease)
1127                        update_dentry_lease(dn, rinfo->dlease, session,
1128                                            req->r_request_started);
1129                dout(" final dn %p\n", dn);
1130                i++;
1131        } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1132                   req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
1133                struct dentry *dn = req->r_dentry;
1134
1135                /* fill out a snapdir LOOKUPSNAP dentry */
1136                BUG_ON(!dn);
1137                BUG_ON(!req->r_locked_dir);
1138                BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1139                ininfo = rinfo->targeti.in;
1140                vino.ino = le64_to_cpu(ininfo->ino);
1141                vino.snap = le64_to_cpu(ininfo->snapid);
1142                in = ceph_get_inode(sb, vino);
1143                if (IS_ERR(in)) {
1144                        pr_err("fill_inode get_inode badness %llx.%llx\n",
1145                               vino.ino, vino.snap);
1146                        err = PTR_ERR(in);
1147                        d_delete(dn);
1148                        goto done;
1149                }
1150                dout(" linking snapped dir %p to dn %p\n", in, dn);
1151                dn = splice_dentry(dn, in, NULL, true);
1152                if (IS_ERR(dn)) {
1153                        err = PTR_ERR(dn);
1154                        goto done;
1155                }
1156                req->r_dentry = dn;  /* may have spliced */
1157                ihold(in);
1158                rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1159        }
1160
1161        if (rinfo->head->is_target) {
1162                vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1163                vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1164
1165                if (in == NULL || ceph_ino(in) != vino.ino ||
1166                    ceph_snap(in) != vino.snap) {
1167                        in = ceph_get_inode(sb, vino);
1168                        if (IS_ERR(in)) {
1169                                err = PTR_ERR(in);
1170                                goto done;
1171                        }
1172                }
1173                req->r_target_inode = in;
1174
1175                err = fill_inode(in,
1176                                 &rinfo->targeti, NULL,
1177                                 session, req->r_request_started,
1178                                 (le32_to_cpu(rinfo->head->result) == 0) ?
1179                                 req->r_fmode : -1,
1180                                 &req->r_caps_reservation);
1181                if (err < 0) {
1182                        pr_err("fill_inode badness %p %llx.%llx\n",
1183                               in, ceph_vinop(in));
1184                        goto done;
1185                }
1186        }
1187
1188done:
1189        dout("fill_trace done err=%d\n", err);
1190        return err;
1191}
1192
1193/*
1194 * Prepopulate our cache with readdir results, leases, etc.
1195 */
1196static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1197                                           struct ceph_mds_session *session)
1198{
1199        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1200        int i, err = 0;
1201
1202        for (i = 0; i < rinfo->dir_nr; i++) {
1203                struct ceph_vino vino;
1204                struct inode *in;
1205                int rc;
1206
1207                vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1208                vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1209
1210                in = ceph_get_inode(req->r_dentry->d_sb, vino);
1211                if (IS_ERR(in)) {
1212                        err = PTR_ERR(in);
1213                        dout("new_inode badness got %d\n", err);
1214                        continue;
1215                }
1216                rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1217                                req->r_request_started, -1,
1218                                &req->r_caps_reservation);
1219                if (rc < 0) {
1220                        pr_err("fill_inode badness on %p got %d\n", in, rc);
1221                        err = rc;
1222                        continue;
1223                }
1224        }
1225
1226        return err;
1227}
1228
1229int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1230                             struct ceph_mds_session *session)
1231{
1232        struct dentry *parent = req->r_dentry;
1233        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1234        struct qstr dname;
1235        struct dentry *dn;
1236        struct inode *in;
1237        int err = 0, i;
1238        struct inode *snapdir = NULL;
1239        struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1240        u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1241        struct ceph_dentry_info *di;
1242
1243        if (req->r_aborted)
1244                return readdir_prepopulate_inodes_only(req, session);
1245
1246        if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1247                snapdir = ceph_get_snapdir(parent->d_inode);
1248                parent = d_find_alias(snapdir);
1249                dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1250                     rinfo->dir_nr, parent);
1251        } else {
1252                dout("readdir_prepopulate %d items under dn %p\n",
1253                     rinfo->dir_nr, parent);
1254                if (rinfo->dir_dir)
1255                        ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1256        }
1257
1258        for (i = 0; i < rinfo->dir_nr; i++) {
1259                struct ceph_vino vino;
1260
1261                dname.name = rinfo->dir_dname[i];
1262                dname.len = rinfo->dir_dname_len[i];
1263                dname.hash = full_name_hash(dname.name, dname.len);
1264
1265                vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1266                vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1267
1268retry_lookup:
1269                dn = d_lookup(parent, &dname);
1270                dout("d_lookup on parent=%p name=%.*s got %p\n",
1271                     parent, dname.len, dname.name, dn);
1272
1273                if (!dn) {
1274                        dn = d_alloc(parent, &dname);
1275                        dout("d_alloc %p '%.*s' = %p\n", parent,
1276                             dname.len, dname.name, dn);
1277                        if (dn == NULL) {
1278                                dout("d_alloc badness\n");
1279                                err = -ENOMEM;
1280                                goto out;
1281                        }
1282                        err = ceph_init_dentry(dn);
1283                        if (err < 0) {
1284                                dput(dn);
1285                                goto out;
1286                        }
1287                } else if (dn->d_inode &&
1288                           (ceph_ino(dn->d_inode) != vino.ino ||
1289                            ceph_snap(dn->d_inode) != vino.snap)) {
1290                        dout(" dn %p points to wrong inode %p\n",
1291                             dn, dn->d_inode);
1292                        d_delete(dn);
1293                        dput(dn);
1294                        goto retry_lookup;
1295                } else {
1296                        /* reorder parent's d_subdirs */
1297                        spin_lock(&parent->d_lock);
1298                        spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1299                        list_move(&dn->d_u.d_child, &parent->d_subdirs);
1300                        spin_unlock(&dn->d_lock);
1301                        spin_unlock(&parent->d_lock);
1302                }
1303
1304                di = dn->d_fsdata;
1305                di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1306
1307                /* inode */
1308                if (dn->d_inode) {
1309                        in = dn->d_inode;
1310                } else {
1311                        in = ceph_get_inode(parent->d_sb, vino);
1312                        if (IS_ERR(in)) {
1313                                dout("new_inode badness\n");
1314                                d_drop(dn);
1315                                dput(dn);
1316                                err = PTR_ERR(in);
1317                                goto out;
1318                        }
1319                        dn = splice_dentry(dn, in, NULL, false);
1320                        if (IS_ERR(dn))
1321                                dn = NULL;
1322                }
1323
1324                if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1325                               req->r_request_started, -1,
1326                               &req->r_caps_reservation) < 0) {
1327                        pr_err("fill_inode badness on %p\n", in);
1328                        goto next_item;
1329                }
1330                if (dn)
1331                        update_dentry_lease(dn, rinfo->dir_dlease[i],
1332                                            req->r_session,
1333                                            req->r_request_started);
1334next_item:
1335                if (dn)
1336                        dput(dn);
1337        }
1338        req->r_did_prepopulate = true;
1339
1340out:
1341        if (snapdir) {
1342                iput(snapdir);
1343                dput(parent);
1344        }
1345        dout("readdir_prepopulate done\n");
1346        return err;
1347}
1348
1349int ceph_inode_set_size(struct inode *inode, loff_t size)
1350{
1351        struct ceph_inode_info *ci = ceph_inode(inode);
1352        int ret = 0;
1353
1354        spin_lock(&ci->i_ceph_lock);
1355        dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1356        inode->i_size = size;
1357        inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1358
1359        /* tell the MDS if we are approaching max_size */
1360        if ((size << 1) >= ci->i_max_size &&
1361            (ci->i_reported_size << 1) < ci->i_max_size)
1362                ret = 1;
1363
1364        spin_unlock(&ci->i_ceph_lock);
1365        return ret;
1366}
1367
1368/*
1369 * Write back inode data in a worker thread.  (This can't be done
1370 * in the message handler context.)
1371 */
1372void ceph_queue_writeback(struct inode *inode)
1373{
1374        ihold(inode);
1375        if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1376                       &ceph_inode(inode)->i_wb_work)) {
1377                dout("ceph_queue_writeback %p\n", inode);
1378        } else {
1379                dout("ceph_queue_writeback %p failed\n", inode);
1380                iput(inode);
1381        }
1382}
1383
1384static void ceph_writeback_work(struct work_struct *work)
1385{
1386        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1387                                                  i_wb_work);
1388        struct inode *inode = &ci->vfs_inode;
1389
1390        dout("writeback %p\n", inode);
1391        filemap_fdatawrite(&inode->i_data);
1392        iput(inode);
1393}
1394
1395/*
1396 * queue an async invalidation
1397 */
1398void ceph_queue_invalidate(struct inode *inode)
1399{
1400        ihold(inode);
1401        if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1402                       &ceph_inode(inode)->i_pg_inv_work)) {
1403                dout("ceph_queue_invalidate %p\n", inode);
1404        } else {
1405                dout("ceph_queue_invalidate %p failed\n", inode);
1406                iput(inode);
1407        }
1408}
1409
1410/*
1411 * Invalidate inode pages in a worker thread.  (This can't be done
1412 * in the message handler context.)
1413 */
1414static void ceph_invalidate_work(struct work_struct *work)
1415{
1416        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1417                                                  i_pg_inv_work);
1418        struct inode *inode = &ci->vfs_inode;
1419        u32 orig_gen;
1420        int check = 0;
1421
1422        spin_lock(&ci->i_ceph_lock);
1423        dout("invalidate_pages %p gen %d revoking %d\n", inode,
1424             ci->i_rdcache_gen, ci->i_rdcache_revoking);
1425        if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1426                /* nevermind! */
1427                spin_unlock(&ci->i_ceph_lock);
1428                goto out;
1429        }
1430        orig_gen = ci->i_rdcache_gen;
1431        spin_unlock(&ci->i_ceph_lock);
1432
1433        truncate_inode_pages(&inode->i_data, 0);
1434
1435        spin_lock(&ci->i_ceph_lock);
1436        if (orig_gen == ci->i_rdcache_gen &&
1437            orig_gen == ci->i_rdcache_revoking) {
1438                dout("invalidate_pages %p gen %d successful\n", inode,
1439                     ci->i_rdcache_gen);
1440                ci->i_rdcache_revoking--;
1441                check = 1;
1442        } else {
1443                dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1444                     inode, orig_gen, ci->i_rdcache_gen,
1445                     ci->i_rdcache_revoking);
1446        }
1447        spin_unlock(&ci->i_ceph_lock);
1448
1449        if (check)
1450                ceph_check_caps(ci, 0, NULL);
1451out:
1452        iput(inode);
1453}
1454
1455
1456/*
1457 * called by trunc_wq;
1458 *
1459 * We also truncate in a separate thread as well.
1460 */
1461static void ceph_vmtruncate_work(struct work_struct *work)
1462{
1463        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1464                                                  i_vmtruncate_work);
1465        struct inode *inode = &ci->vfs_inode;
1466
1467        dout("vmtruncate_work %p\n", inode);
1468        mutex_lock(&inode->i_mutex);
1469        __ceph_do_pending_vmtruncate(inode);
1470        mutex_unlock(&inode->i_mutex);
1471        iput(inode);
1472}
1473
1474/*
1475 * Queue an async vmtruncate.  If we fail to queue work, we will handle
1476 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1477 */
1478void ceph_queue_vmtruncate(struct inode *inode)
1479{
1480        struct ceph_inode_info *ci = ceph_inode(inode);
1481
1482        ihold(inode);
1483        if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1484                       &ci->i_vmtruncate_work)) {
1485                dout("ceph_queue_vmtruncate %p\n", inode);
1486        } else {
1487                dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1488                     inode, ci->i_truncate_pending);
1489                iput(inode);
1490        }
1491}
1492
1493/*
1494 * Make sure any pending truncation is applied before doing anything
1495 * that may depend on it.
1496 */
1497void __ceph_do_pending_vmtruncate(struct inode *inode)
1498{
1499        struct ceph_inode_info *ci = ceph_inode(inode);
1500        u64 to;
1501        int wrbuffer_refs, finish = 0;
1502
1503retry:
1504        spin_lock(&ci->i_ceph_lock);
1505        if (ci->i_truncate_pending == 0) {
1506                dout("__do_pending_vmtruncate %p none pending\n", inode);
1507                spin_unlock(&ci->i_ceph_lock);
1508                return;
1509        }
1510
1511        /*
1512         * make sure any dirty snapped pages are flushed before we
1513         * possibly truncate them.. so write AND block!
1514         */
1515        if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1516                dout("__do_pending_vmtruncate %p flushing snaps first\n",
1517                     inode);
1518                spin_unlock(&ci->i_ceph_lock);
1519                filemap_write_and_wait_range(&inode->i_data, 0,
1520                                             inode->i_sb->s_maxbytes);
1521                goto retry;
1522        }
1523
1524        to = ci->i_truncate_size;
1525        wrbuffer_refs = ci->i_wrbuffer_ref;
1526        dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1527             ci->i_truncate_pending, to);
1528        spin_unlock(&ci->i_ceph_lock);
1529
1530        truncate_inode_pages(inode->i_mapping, to);
1531
1532        spin_lock(&ci->i_ceph_lock);
1533        if (to == ci->i_truncate_size) {
1534                ci->i_truncate_pending = 0;
1535                finish = 1;
1536        }
1537        spin_unlock(&ci->i_ceph_lock);
1538        if (!finish)
1539                goto retry;
1540
1541        if (wrbuffer_refs == 0)
1542                ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1543
1544        wake_up_all(&ci->i_cap_wq);
1545}
1546
1547
1548/*
1549 * symlinks
1550 */
1551static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1552{
1553        struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1554        nd_set_link(nd, ci->i_symlink);
1555        return NULL;
1556}
1557
1558static const struct inode_operations ceph_symlink_iops = {
1559        .readlink = generic_readlink,
1560        .follow_link = ceph_sym_follow_link,
1561        .setattr = ceph_setattr,
1562        .getattr = ceph_getattr,
1563        .setxattr = ceph_setxattr,
1564        .getxattr = ceph_getxattr,
1565        .listxattr = ceph_listxattr,
1566        .removexattr = ceph_removexattr,
1567};
1568
1569/*
1570 * setattr
1571 */
1572int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1573{
1574        struct inode *inode = dentry->d_inode;
1575        struct ceph_inode_info *ci = ceph_inode(inode);
1576        struct inode *parent_inode;
1577        const unsigned int ia_valid = attr->ia_valid;
1578        struct ceph_mds_request *req;
1579        struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1580        int issued;
1581        int release = 0, dirtied = 0;
1582        int mask = 0;
1583        int err = 0;
1584        int inode_dirty_flags = 0;
1585
1586        if (ceph_snap(inode) != CEPH_NOSNAP)
1587                return -EROFS;
1588
1589        __ceph_do_pending_vmtruncate(inode);
1590
1591        err = inode_change_ok(inode, attr);
1592        if (err != 0)
1593                return err;
1594
1595        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1596                                       USE_AUTH_MDS);
1597        if (IS_ERR(req))
1598                return PTR_ERR(req);
1599
1600        spin_lock(&ci->i_ceph_lock);
1601        issued = __ceph_caps_issued(ci, NULL);
1602        dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1603
1604        if (ia_valid & ATTR_UID) {
1605                dout("setattr %p uid %d -> %d\n", inode,
1606                     from_kuid(&init_user_ns, inode->i_uid),
1607                     from_kuid(&init_user_ns, attr->ia_uid));
1608                if (issued & CEPH_CAP_AUTH_EXCL) {
1609                        inode->i_uid = attr->ia_uid;
1610                        dirtied |= CEPH_CAP_AUTH_EXCL;
1611                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1612                           !uid_eq(attr->ia_uid, inode->i_uid)) {
1613                        req->r_args.setattr.uid = cpu_to_le32(
1614                                from_kuid(&init_user_ns, attr->ia_uid));
1615                        mask |= CEPH_SETATTR_UID;
1616                        release |= CEPH_CAP_AUTH_SHARED;
1617                }
1618        }
1619        if (ia_valid & ATTR_GID) {
1620                dout("setattr %p gid %d -> %d\n", inode,
1621                     from_kgid(&init_user_ns, inode->i_gid),
1622                     from_kgid(&init_user_ns, attr->ia_gid));
1623                if (issued & CEPH_CAP_AUTH_EXCL) {
1624                        inode->i_gid = attr->ia_gid;
1625                        dirtied |= CEPH_CAP_AUTH_EXCL;
1626                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1627                           !gid_eq(attr->ia_gid, inode->i_gid)) {
1628                        req->r_args.setattr.gid = cpu_to_le32(
1629                                from_kgid(&init_user_ns, attr->ia_gid));
1630                        mask |= CEPH_SETATTR_GID;
1631                        release |= CEPH_CAP_AUTH_SHARED;
1632                }
1633        }
1634        if (ia_valid & ATTR_MODE) {
1635                dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1636                     attr->ia_mode);
1637                if (issued & CEPH_CAP_AUTH_EXCL) {
1638                        inode->i_mode = attr->ia_mode;
1639                        dirtied |= CEPH_CAP_AUTH_EXCL;
1640                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1641                           attr->ia_mode != inode->i_mode) {
1642                        req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1643                        mask |= CEPH_SETATTR_MODE;
1644                        release |= CEPH_CAP_AUTH_SHARED;
1645                }
1646        }
1647
1648        if (ia_valid & ATTR_ATIME) {
1649                dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1650                     inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1651                     attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1652                if (issued & CEPH_CAP_FILE_EXCL) {
1653                        ci->i_time_warp_seq++;
1654                        inode->i_atime = attr->ia_atime;
1655                        dirtied |= CEPH_CAP_FILE_EXCL;
1656                } else if ((issued & CEPH_CAP_FILE_WR) &&
1657                           timespec_compare(&inode->i_atime,
1658                                            &attr->ia_atime) < 0) {
1659                        inode->i_atime = attr->ia_atime;
1660                        dirtied |= CEPH_CAP_FILE_WR;
1661                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1662                           !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1663                        ceph_encode_timespec(&req->r_args.setattr.atime,
1664                                             &attr->ia_atime);
1665                        mask |= CEPH_SETATTR_ATIME;
1666                        release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1667                                CEPH_CAP_FILE_WR;
1668                }
1669        }
1670        if (ia_valid & ATTR_MTIME) {
1671                dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1672                     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1673                     attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1674                if (issued & CEPH_CAP_FILE_EXCL) {
1675                        ci->i_time_warp_seq++;
1676                        inode->i_mtime = attr->ia_mtime;
1677                        dirtied |= CEPH_CAP_FILE_EXCL;
1678                } else if ((issued & CEPH_CAP_FILE_WR) &&
1679                           timespec_compare(&inode->i_mtime,
1680                                            &attr->ia_mtime) < 0) {
1681                        inode->i_mtime = attr->ia_mtime;
1682                        dirtied |= CEPH_CAP_FILE_WR;
1683                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1684                           !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1685                        ceph_encode_timespec(&req->r_args.setattr.mtime,
1686                                             &attr->ia_mtime);
1687                        mask |= CEPH_SETATTR_MTIME;
1688                        release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1689                                CEPH_CAP_FILE_WR;
1690                }
1691        }
1692        if (ia_valid & ATTR_SIZE) {
1693                dout("setattr %p size %lld -> %lld\n", inode,
1694                     inode->i_size, attr->ia_size);
1695                if (attr->ia_size > inode->i_sb->s_maxbytes) {
1696                        err = -EINVAL;
1697                        goto out;
1698                }
1699                if ((issued & CEPH_CAP_FILE_EXCL) &&
1700                    attr->ia_size > inode->i_size) {
1701                        inode->i_size = attr->ia_size;
1702                        inode->i_blocks =
1703                                (attr->ia_size + (1 << 9) - 1) >> 9;
1704                        inode->i_ctime = attr->ia_ctime;
1705                        ci->i_reported_size = attr->ia_size;
1706                        dirtied |= CEPH_CAP_FILE_EXCL;
1707                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1708                           attr->ia_size != inode->i_size) {
1709                        req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1710                        req->r_args.setattr.old_size =
1711                                cpu_to_le64(inode->i_size);
1712                        mask |= CEPH_SETATTR_SIZE;
1713                        release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1714                                CEPH_CAP_FILE_WR;
1715                }
1716        }
1717
1718        /* these do nothing */
1719        if (ia_valid & ATTR_CTIME) {
1720                bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1721                                         ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1722                dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1723                     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1724                     attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1725                     only ? "ctime only" : "ignored");
1726                inode->i_ctime = attr->ia_ctime;
1727                if (only) {
1728                        /*
1729                         * if kernel wants to dirty ctime but nothing else,
1730                         * we need to choose a cap to dirty under, or do
1731                         * a almost-no-op setattr
1732                         */
1733                        if (issued & CEPH_CAP_AUTH_EXCL)
1734                                dirtied |= CEPH_CAP_AUTH_EXCL;
1735                        else if (issued & CEPH_CAP_FILE_EXCL)
1736                                dirtied |= CEPH_CAP_FILE_EXCL;
1737                        else if (issued & CEPH_CAP_XATTR_EXCL)
1738                                dirtied |= CEPH_CAP_XATTR_EXCL;
1739                        else
1740                                mask |= CEPH_SETATTR_CTIME;
1741                }
1742        }
1743        if (ia_valid & ATTR_FILE)
1744                dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1745
1746        if (dirtied) {
1747                inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1748                inode->i_ctime = CURRENT_TIME;
1749        }
1750
1751        release &= issued;
1752        spin_unlock(&ci->i_ceph_lock);
1753
1754        if (inode_dirty_flags)
1755                __mark_inode_dirty(inode, inode_dirty_flags);
1756
1757        if (mask) {
1758                req->r_inode = inode;
1759                ihold(inode);
1760                req->r_inode_drop = release;
1761                req->r_args.setattr.mask = cpu_to_le32(mask);
1762                req->r_num_caps = 1;
1763                parent_inode = ceph_get_dentry_parent_inode(dentry);
1764                err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1765                iput(parent_inode);
1766        }
1767        dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1768             ceph_cap_string(dirtied), mask);
1769
1770        ceph_mdsc_put_request(req);
1771        __ceph_do_pending_vmtruncate(inode);
1772        return err;
1773out:
1774        spin_unlock(&ci->i_ceph_lock);
1775        ceph_mdsc_put_request(req);
1776        return err;
1777}
1778
1779/*
1780 * Verify that we have a lease on the given mask.  If not,
1781 * do a getattr against an mds.
1782 */
1783int ceph_do_getattr(struct inode *inode, int mask)
1784{
1785        struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1786        struct ceph_mds_client *mdsc = fsc->mdsc;
1787        struct ceph_mds_request *req;
1788        int err;
1789
1790        if (ceph_snap(inode) == CEPH_SNAPDIR) {
1791                dout("do_getattr inode %p SNAPDIR\n", inode);
1792                return 0;
1793        }
1794
1795        dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1796        if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1797                return 0;
1798
1799        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1800        if (IS_ERR(req))
1801                return PTR_ERR(req);
1802        req->r_inode = inode;
1803        ihold(inode);
1804        req->r_num_caps = 1;
1805        req->r_args.getattr.mask = cpu_to_le32(mask);
1806        err = ceph_mdsc_do_request(mdsc, NULL, req);
1807        ceph_mdsc_put_request(req);
1808        dout("do_getattr result=%d\n", err);
1809        return err;
1810}
1811
1812
1813/*
1814 * Check inode permissions.  We verify we have a valid value for
1815 * the AUTH cap, then call the generic handler.
1816 */
1817int ceph_permission(struct inode *inode, int mask)
1818{
1819        int err;
1820
1821        if (mask & MAY_NOT_BLOCK)
1822                return -ECHILD;
1823
1824        err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1825
1826        if (!err)
1827                err = generic_permission(inode, mask);
1828        return err;
1829}
1830
1831/*
1832 * Get all attributes.  Hopefully somedata we'll have a statlite()
1833 * and can limit the fields we require to be accurate.
1834 */
1835int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1836                 struct kstat *stat)
1837{
1838        struct inode *inode = dentry->d_inode;
1839        struct ceph_inode_info *ci = ceph_inode(inode);
1840        int err;
1841
1842        err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1843        if (!err) {
1844                generic_fillattr(inode, stat);
1845                stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1846                if (ceph_snap(inode) != CEPH_NOSNAP)
1847                        stat->dev = ceph_snap(inode);
1848                else
1849                        stat->dev = 0;
1850                if (S_ISDIR(inode->i_mode)) {
1851                        if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1852                                                RBYTES))
1853                                stat->size = ci->i_rbytes;
1854                        else
1855                                stat->size = ci->i_files + ci->i_subdirs;
1856                        stat->blocks = 0;
1857                        stat->blksize = 65536;
1858                }
1859        }
1860        return err;
1861}
1862
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