linux/fs/ceph/inode.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/ceph/ceph_debug.h>
   3
   4#include <linux/module.h>
   5#include <linux/fs.h>
   6#include <linux/slab.h>
   7#include <linux/string.h>
   8#include <linux/uaccess.h>
   9#include <linux/kernel.h>
  10#include <linux/writeback.h>
  11#include <linux/vmalloc.h>
  12#include <linux/xattr.h>
  13#include <linux/posix_acl.h>
  14#include <linux/random.h>
  15#include <linux/sort.h>
  16#include <linux/iversion.h>
  17
  18#include "super.h"
  19#include "mds_client.h"
  20#include "cache.h"
  21#include <linux/ceph/decode.h>
  22
  23/*
  24 * Ceph inode operations
  25 *
  26 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  27 * setattr, etc.), xattr helpers, and helpers for assimilating
  28 * metadata returned by the MDS into our cache.
  29 *
  30 * Also define helpers for doing asynchronous writeback, invalidation,
  31 * and truncation for the benefit of those who can't afford to block
  32 * (typically because they are in the message handler path).
  33 */
  34
  35static const struct inode_operations ceph_symlink_iops;
  36
  37static void ceph_inode_work(struct work_struct *work);
  38
  39/*
  40 * find or create an inode, given the ceph ino number
  41 */
  42static int ceph_set_ino_cb(struct inode *inode, void *data)
  43{
  44        struct ceph_inode_info *ci = ceph_inode(inode);
  45        struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
  46
  47        ci->i_vino = *(struct ceph_vino *)data;
  48        inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
  49        inode_set_iversion_raw(inode, 0);
  50        percpu_counter_inc(&mdsc->metric.total_inodes);
  51
  52        return 0;
  53}
  54
  55struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  56{
  57        struct inode *inode;
  58
  59        if (ceph_vino_is_reserved(vino))
  60                return ERR_PTR(-EREMOTEIO);
  61
  62        inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
  63                             ceph_set_ino_cb, &vino);
  64        if (!inode)
  65                return ERR_PTR(-ENOMEM);
  66
  67        dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
  68             ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
  69        return inode;
  70}
  71
  72/*
  73 * get/constuct snapdir inode for a given directory
  74 */
  75struct inode *ceph_get_snapdir(struct inode *parent)
  76{
  77        struct ceph_vino vino = {
  78                .ino = ceph_ino(parent),
  79                .snap = CEPH_SNAPDIR,
  80        };
  81        struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  82        struct ceph_inode_info *ci = ceph_inode(inode);
  83
  84        if (IS_ERR(inode))
  85                return inode;
  86
  87        if (!S_ISDIR(parent->i_mode)) {
  88                pr_warn_once("bad snapdir parent type (mode=0%o)\n",
  89                             parent->i_mode);
  90                return ERR_PTR(-ENOTDIR);
  91        }
  92
  93        if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
  94                pr_warn_once("bad snapdir inode type (mode=0%o)\n",
  95                             inode->i_mode);
  96                return ERR_PTR(-ENOTDIR);
  97        }
  98
  99        inode->i_mode = parent->i_mode;
 100        inode->i_uid = parent->i_uid;
 101        inode->i_gid = parent->i_gid;
 102        inode->i_mtime = parent->i_mtime;
 103        inode->i_ctime = parent->i_ctime;
 104        inode->i_atime = parent->i_atime;
 105        ci->i_rbytes = 0;
 106        ci->i_btime = ceph_inode(parent)->i_btime;
 107
 108        if (inode->i_state & I_NEW) {
 109                inode->i_op = &ceph_snapdir_iops;
 110                inode->i_fop = &ceph_snapdir_fops;
 111                ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 112                unlock_new_inode(inode);
 113        }
 114
 115        return inode;
 116}
 117
 118const struct inode_operations ceph_file_iops = {
 119        .permission = ceph_permission,
 120        .setattr = ceph_setattr,
 121        .getattr = ceph_getattr,
 122        .listxattr = ceph_listxattr,
 123        .get_acl = ceph_get_acl,
 124        .set_acl = ceph_set_acl,
 125};
 126
 127
 128/*
 129 * We use a 'frag tree' to keep track of the MDS's directory fragments
 130 * for a given inode (usually there is just a single fragment).  We
 131 * need to know when a child frag is delegated to a new MDS, or when
 132 * it is flagged as replicated, so we can direct our requests
 133 * accordingly.
 134 */
 135
 136/*
 137 * find/create a frag in the tree
 138 */
 139static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 140                                                    u32 f)
 141{
 142        struct rb_node **p;
 143        struct rb_node *parent = NULL;
 144        struct ceph_inode_frag *frag;
 145        int c;
 146
 147        p = &ci->i_fragtree.rb_node;
 148        while (*p) {
 149                parent = *p;
 150                frag = rb_entry(parent, struct ceph_inode_frag, node);
 151                c = ceph_frag_compare(f, frag->frag);
 152                if (c < 0)
 153                        p = &(*p)->rb_left;
 154                else if (c > 0)
 155                        p = &(*p)->rb_right;
 156                else
 157                        return frag;
 158        }
 159
 160        frag = kmalloc(sizeof(*frag), GFP_NOFS);
 161        if (!frag)
 162                return ERR_PTR(-ENOMEM);
 163
 164        frag->frag = f;
 165        frag->split_by = 0;
 166        frag->mds = -1;
 167        frag->ndist = 0;
 168
 169        rb_link_node(&frag->node, parent, p);
 170        rb_insert_color(&frag->node, &ci->i_fragtree);
 171
 172        dout("get_or_create_frag added %llx.%llx frag %x\n",
 173             ceph_vinop(&ci->vfs_inode), f);
 174        return frag;
 175}
 176
 177/*
 178 * find a specific frag @f
 179 */
 180struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 181{
 182        struct rb_node *n = ci->i_fragtree.rb_node;
 183
 184        while (n) {
 185                struct ceph_inode_frag *frag =
 186                        rb_entry(n, struct ceph_inode_frag, node);
 187                int c = ceph_frag_compare(f, frag->frag);
 188                if (c < 0)
 189                        n = n->rb_left;
 190                else if (c > 0)
 191                        n = n->rb_right;
 192                else
 193                        return frag;
 194        }
 195        return NULL;
 196}
 197
 198/*
 199 * Choose frag containing the given value @v.  If @pfrag is
 200 * specified, copy the frag delegation info to the caller if
 201 * it is present.
 202 */
 203static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 204                              struct ceph_inode_frag *pfrag, int *found)
 205{
 206        u32 t = ceph_frag_make(0, 0);
 207        struct ceph_inode_frag *frag;
 208        unsigned nway, i;
 209        u32 n;
 210
 211        if (found)
 212                *found = 0;
 213
 214        while (1) {
 215                WARN_ON(!ceph_frag_contains_value(t, v));
 216                frag = __ceph_find_frag(ci, t);
 217                if (!frag)
 218                        break; /* t is a leaf */
 219                if (frag->split_by == 0) {
 220                        if (pfrag)
 221                                memcpy(pfrag, frag, sizeof(*pfrag));
 222                        if (found)
 223                                *found = 1;
 224                        break;
 225                }
 226
 227                /* choose child */
 228                nway = 1 << frag->split_by;
 229                dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 230                     frag->split_by, nway);
 231                for (i = 0; i < nway; i++) {
 232                        n = ceph_frag_make_child(t, frag->split_by, i);
 233                        if (ceph_frag_contains_value(n, v)) {
 234                                t = n;
 235                                break;
 236                        }
 237                }
 238                BUG_ON(i == nway);
 239        }
 240        dout("choose_frag(%x) = %x\n", v, t);
 241
 242        return t;
 243}
 244
 245u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 246                     struct ceph_inode_frag *pfrag, int *found)
 247{
 248        u32 ret;
 249        mutex_lock(&ci->i_fragtree_mutex);
 250        ret = __ceph_choose_frag(ci, v, pfrag, found);
 251        mutex_unlock(&ci->i_fragtree_mutex);
 252        return ret;
 253}
 254
 255/*
 256 * Process dirfrag (delegation) info from the mds.  Include leaf
 257 * fragment in tree ONLY if ndist > 0.  Otherwise, only
 258 * branches/splits are included in i_fragtree)
 259 */
 260static int ceph_fill_dirfrag(struct inode *inode,
 261                             struct ceph_mds_reply_dirfrag *dirinfo)
 262{
 263        struct ceph_inode_info *ci = ceph_inode(inode);
 264        struct ceph_inode_frag *frag;
 265        u32 id = le32_to_cpu(dirinfo->frag);
 266        int mds = le32_to_cpu(dirinfo->auth);
 267        int ndist = le32_to_cpu(dirinfo->ndist);
 268        int diri_auth = -1;
 269        int i;
 270        int err = 0;
 271
 272        spin_lock(&ci->i_ceph_lock);
 273        if (ci->i_auth_cap)
 274                diri_auth = ci->i_auth_cap->mds;
 275        spin_unlock(&ci->i_ceph_lock);
 276
 277        if (mds == -1) /* CDIR_AUTH_PARENT */
 278                mds = diri_auth;
 279
 280        mutex_lock(&ci->i_fragtree_mutex);
 281        if (ndist == 0 && mds == diri_auth) {
 282                /* no delegation info needed. */
 283                frag = __ceph_find_frag(ci, id);
 284                if (!frag)
 285                        goto out;
 286                if (frag->split_by == 0) {
 287                        /* tree leaf, remove */
 288                        dout("fill_dirfrag removed %llx.%llx frag %x"
 289                             " (no ref)\n", ceph_vinop(inode), id);
 290                        rb_erase(&frag->node, &ci->i_fragtree);
 291                        kfree(frag);
 292                } else {
 293                        /* tree branch, keep and clear */
 294                        dout("fill_dirfrag cleared %llx.%llx frag %x"
 295                             " referral\n", ceph_vinop(inode), id);
 296                        frag->mds = -1;
 297                        frag->ndist = 0;
 298                }
 299                goto out;
 300        }
 301
 302
 303        /* find/add this frag to store mds delegation info */
 304        frag = __get_or_create_frag(ci, id);
 305        if (IS_ERR(frag)) {
 306                /* this is not the end of the world; we can continue
 307                   with bad/inaccurate delegation info */
 308                pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 309                       ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 310                err = -ENOMEM;
 311                goto out;
 312        }
 313
 314        frag->mds = mds;
 315        frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 316        for (i = 0; i < frag->ndist; i++)
 317                frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 318        dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 319             ceph_vinop(inode), frag->frag, frag->ndist);
 320
 321out:
 322        mutex_unlock(&ci->i_fragtree_mutex);
 323        return err;
 324}
 325
 326static int frag_tree_split_cmp(const void *l, const void *r)
 327{
 328        struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 329        struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 330        return ceph_frag_compare(le32_to_cpu(ls->frag),
 331                                 le32_to_cpu(rs->frag));
 332}
 333
 334static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 335{
 336        if (!frag)
 337                return f == ceph_frag_make(0, 0);
 338        if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 339                return false;
 340        return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 341}
 342
 343static int ceph_fill_fragtree(struct inode *inode,
 344                              struct ceph_frag_tree_head *fragtree,
 345                              struct ceph_mds_reply_dirfrag *dirinfo)
 346{
 347        struct ceph_inode_info *ci = ceph_inode(inode);
 348        struct ceph_inode_frag *frag, *prev_frag = NULL;
 349        struct rb_node *rb_node;
 350        unsigned i, split_by, nsplits;
 351        u32 id;
 352        bool update = false;
 353
 354        mutex_lock(&ci->i_fragtree_mutex);
 355        nsplits = le32_to_cpu(fragtree->nsplits);
 356        if (nsplits != ci->i_fragtree_nsplits) {
 357                update = true;
 358        } else if (nsplits) {
 359                i = prandom_u32() % nsplits;
 360                id = le32_to_cpu(fragtree->splits[i].frag);
 361                if (!__ceph_find_frag(ci, id))
 362                        update = true;
 363        } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 364                rb_node = rb_first(&ci->i_fragtree);
 365                frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 366                if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 367                        update = true;
 368        }
 369        if (!update && dirinfo) {
 370                id = le32_to_cpu(dirinfo->frag);
 371                if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 372                        update = true;
 373        }
 374        if (!update)
 375                goto out_unlock;
 376
 377        if (nsplits > 1) {
 378                sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 379                     frag_tree_split_cmp, NULL);
 380        }
 381
 382        dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 383        rb_node = rb_first(&ci->i_fragtree);
 384        for (i = 0; i < nsplits; i++) {
 385                id = le32_to_cpu(fragtree->splits[i].frag);
 386                split_by = le32_to_cpu(fragtree->splits[i].by);
 387                if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 388                        pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 389                               "frag %x split by %d\n", ceph_vinop(inode),
 390                               i, nsplits, id, split_by);
 391                        continue;
 392                }
 393                frag = NULL;
 394                while (rb_node) {
 395                        frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 396                        if (ceph_frag_compare(frag->frag, id) >= 0) {
 397                                if (frag->frag != id)
 398                                        frag = NULL;
 399                                else
 400                                        rb_node = rb_next(rb_node);
 401                                break;
 402                        }
 403                        rb_node = rb_next(rb_node);
 404                        /* delete stale split/leaf node */
 405                        if (frag->split_by > 0 ||
 406                            !is_frag_child(frag->frag, prev_frag)) {
 407                                rb_erase(&frag->node, &ci->i_fragtree);
 408                                if (frag->split_by > 0)
 409                                        ci->i_fragtree_nsplits--;
 410                                kfree(frag);
 411                        }
 412                        frag = NULL;
 413                }
 414                if (!frag) {
 415                        frag = __get_or_create_frag(ci, id);
 416                        if (IS_ERR(frag))
 417                                continue;
 418                }
 419                if (frag->split_by == 0)
 420                        ci->i_fragtree_nsplits++;
 421                frag->split_by = split_by;
 422                dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 423                prev_frag = frag;
 424        }
 425        while (rb_node) {
 426                frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 427                rb_node = rb_next(rb_node);
 428                /* delete stale split/leaf node */
 429                if (frag->split_by > 0 ||
 430                    !is_frag_child(frag->frag, prev_frag)) {
 431                        rb_erase(&frag->node, &ci->i_fragtree);
 432                        if (frag->split_by > 0)
 433                                ci->i_fragtree_nsplits--;
 434                        kfree(frag);
 435                }
 436        }
 437out_unlock:
 438        mutex_unlock(&ci->i_fragtree_mutex);
 439        return 0;
 440}
 441
 442/*
 443 * initialize a newly allocated inode.
 444 */
 445struct inode *ceph_alloc_inode(struct super_block *sb)
 446{
 447        struct ceph_inode_info *ci;
 448        int i;
 449
 450        ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 451        if (!ci)
 452                return NULL;
 453
 454        dout("alloc_inode %p\n", &ci->vfs_inode);
 455
 456        spin_lock_init(&ci->i_ceph_lock);
 457
 458        ci->i_version = 0;
 459        ci->i_inline_version = 0;
 460        ci->i_time_warp_seq = 0;
 461        ci->i_ceph_flags = 0;
 462        atomic64_set(&ci->i_ordered_count, 1);
 463        atomic64_set(&ci->i_release_count, 1);
 464        atomic64_set(&ci->i_complete_seq[0], 0);
 465        atomic64_set(&ci->i_complete_seq[1], 0);
 466        ci->i_symlink = NULL;
 467
 468        ci->i_max_bytes = 0;
 469        ci->i_max_files = 0;
 470
 471        memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 472        memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 473        RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 474
 475        ci->i_fragtree = RB_ROOT;
 476        mutex_init(&ci->i_fragtree_mutex);
 477
 478        ci->i_xattrs.blob = NULL;
 479        ci->i_xattrs.prealloc_blob = NULL;
 480        ci->i_xattrs.dirty = false;
 481        ci->i_xattrs.index = RB_ROOT;
 482        ci->i_xattrs.count = 0;
 483        ci->i_xattrs.names_size = 0;
 484        ci->i_xattrs.vals_size = 0;
 485        ci->i_xattrs.version = 0;
 486        ci->i_xattrs.index_version = 0;
 487
 488        ci->i_caps = RB_ROOT;
 489        ci->i_auth_cap = NULL;
 490        ci->i_dirty_caps = 0;
 491        ci->i_flushing_caps = 0;
 492        INIT_LIST_HEAD(&ci->i_dirty_item);
 493        INIT_LIST_HEAD(&ci->i_flushing_item);
 494        ci->i_prealloc_cap_flush = NULL;
 495        INIT_LIST_HEAD(&ci->i_cap_flush_list);
 496        init_waitqueue_head(&ci->i_cap_wq);
 497        ci->i_hold_caps_max = 0;
 498        INIT_LIST_HEAD(&ci->i_cap_delay_list);
 499        INIT_LIST_HEAD(&ci->i_cap_snaps);
 500        ci->i_head_snapc = NULL;
 501        ci->i_snap_caps = 0;
 502
 503        ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 504        for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 505                ci->i_nr_by_mode[i] = 0;
 506
 507        mutex_init(&ci->i_truncate_mutex);
 508        ci->i_truncate_seq = 0;
 509        ci->i_truncate_size = 0;
 510        ci->i_truncate_pending = 0;
 511
 512        ci->i_max_size = 0;
 513        ci->i_reported_size = 0;
 514        ci->i_wanted_max_size = 0;
 515        ci->i_requested_max_size = 0;
 516
 517        ci->i_pin_ref = 0;
 518        ci->i_rd_ref = 0;
 519        ci->i_rdcache_ref = 0;
 520        ci->i_wr_ref = 0;
 521        ci->i_wb_ref = 0;
 522        ci->i_fx_ref = 0;
 523        ci->i_wrbuffer_ref = 0;
 524        ci->i_wrbuffer_ref_head = 0;
 525        atomic_set(&ci->i_filelock_ref, 0);
 526        atomic_set(&ci->i_shared_gen, 1);
 527        ci->i_rdcache_gen = 0;
 528        ci->i_rdcache_revoking = 0;
 529
 530        INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 531        INIT_LIST_HEAD(&ci->i_unsafe_iops);
 532        spin_lock_init(&ci->i_unsafe_lock);
 533
 534        ci->i_snap_realm = NULL;
 535        INIT_LIST_HEAD(&ci->i_snap_realm_item);
 536        INIT_LIST_HEAD(&ci->i_snap_flush_item);
 537
 538        INIT_WORK(&ci->i_work, ceph_inode_work);
 539        ci->i_work_mask = 0;
 540        memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 541
 542        ceph_fscache_inode_init(ci);
 543
 544        ci->i_meta_err = 0;
 545
 546        return &ci->vfs_inode;
 547}
 548
 549void ceph_free_inode(struct inode *inode)
 550{
 551        struct ceph_inode_info *ci = ceph_inode(inode);
 552
 553        kfree(ci->i_symlink);
 554        kmem_cache_free(ceph_inode_cachep, ci);
 555}
 556
 557void ceph_evict_inode(struct inode *inode)
 558{
 559        struct ceph_inode_info *ci = ceph_inode(inode);
 560        struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 561        struct ceph_inode_frag *frag;
 562        struct rb_node *n;
 563
 564        dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 565
 566        percpu_counter_dec(&mdsc->metric.total_inodes);
 567
 568        truncate_inode_pages_final(&inode->i_data);
 569        clear_inode(inode);
 570
 571        ceph_fscache_unregister_inode_cookie(ci);
 572
 573        __ceph_remove_caps(ci);
 574
 575        if (__ceph_has_any_quota(ci))
 576                ceph_adjust_quota_realms_count(inode, false);
 577
 578        /*
 579         * we may still have a snap_realm reference if there are stray
 580         * caps in i_snap_caps.
 581         */
 582        if (ci->i_snap_realm) {
 583                if (ceph_snap(inode) == CEPH_NOSNAP) {
 584                        struct ceph_snap_realm *realm = ci->i_snap_realm;
 585                        dout(" dropping residual ref to snap realm %p\n",
 586                             realm);
 587                        spin_lock(&realm->inodes_with_caps_lock);
 588                        list_del_init(&ci->i_snap_realm_item);
 589                        ci->i_snap_realm = NULL;
 590                        if (realm->ino == ci->i_vino.ino)
 591                                realm->inode = NULL;
 592                        spin_unlock(&realm->inodes_with_caps_lock);
 593                        ceph_put_snap_realm(mdsc, realm);
 594                } else {
 595                        ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 596                        ci->i_snap_realm = NULL;
 597                }
 598        }
 599
 600        while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 601                frag = rb_entry(n, struct ceph_inode_frag, node);
 602                rb_erase(n, &ci->i_fragtree);
 603                kfree(frag);
 604        }
 605        ci->i_fragtree_nsplits = 0;
 606
 607        __ceph_destroy_xattrs(ci);
 608        if (ci->i_xattrs.blob)
 609                ceph_buffer_put(ci->i_xattrs.blob);
 610        if (ci->i_xattrs.prealloc_blob)
 611                ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 612
 613        ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 614        ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 615}
 616
 617static inline blkcnt_t calc_inode_blocks(u64 size)
 618{
 619        return (size + (1<<9) - 1) >> 9;
 620}
 621
 622/*
 623 * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 624 * careful because either the client or MDS may have more up to date
 625 * info, depending on which capabilities are held, and whether
 626 * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 627 * and size are monotonically increasing, except when utimes() or
 628 * truncate() increments the corresponding _seq values.)
 629 */
 630int ceph_fill_file_size(struct inode *inode, int issued,
 631                        u32 truncate_seq, u64 truncate_size, u64 size)
 632{
 633        struct ceph_inode_info *ci = ceph_inode(inode);
 634        int queue_trunc = 0;
 635        loff_t isize = i_size_read(inode);
 636
 637        if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 638            (truncate_seq == ci->i_truncate_seq && size > isize)) {
 639                dout("size %lld -> %llu\n", isize, size);
 640                if (size > 0 && S_ISDIR(inode->i_mode)) {
 641                        pr_err("fill_file_size non-zero size for directory\n");
 642                        size = 0;
 643                }
 644                i_size_write(inode, size);
 645                inode->i_blocks = calc_inode_blocks(size);
 646                ci->i_reported_size = size;
 647                if (truncate_seq != ci->i_truncate_seq) {
 648                        dout("truncate_seq %u -> %u\n",
 649                             ci->i_truncate_seq, truncate_seq);
 650                        ci->i_truncate_seq = truncate_seq;
 651
 652                        /* the MDS should have revoked these caps */
 653                        WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 654                                               CEPH_CAP_FILE_RD |
 655                                               CEPH_CAP_FILE_WR |
 656                                               CEPH_CAP_FILE_LAZYIO));
 657                        /*
 658                         * If we hold relevant caps, or in the case where we're
 659                         * not the only client referencing this file and we
 660                         * don't hold those caps, then we need to check whether
 661                         * the file is either opened or mmaped
 662                         */
 663                        if ((issued & (CEPH_CAP_FILE_CACHE|
 664                                       CEPH_CAP_FILE_BUFFER)) ||
 665                            mapping_mapped(inode->i_mapping) ||
 666                            __ceph_is_file_opened(ci)) {
 667                                ci->i_truncate_pending++;
 668                                queue_trunc = 1;
 669                        }
 670                }
 671        }
 672        if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 673            ci->i_truncate_size != truncate_size) {
 674                dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 675                     truncate_size);
 676                ci->i_truncate_size = truncate_size;
 677        }
 678
 679        if (queue_trunc)
 680                ceph_fscache_invalidate(inode);
 681
 682        return queue_trunc;
 683}
 684
 685void ceph_fill_file_time(struct inode *inode, int issued,
 686                         u64 time_warp_seq, struct timespec64 *ctime,
 687                         struct timespec64 *mtime, struct timespec64 *atime)
 688{
 689        struct ceph_inode_info *ci = ceph_inode(inode);
 690        int warn = 0;
 691
 692        if (issued & (CEPH_CAP_FILE_EXCL|
 693                      CEPH_CAP_FILE_WR|
 694                      CEPH_CAP_FILE_BUFFER|
 695                      CEPH_CAP_AUTH_EXCL|
 696                      CEPH_CAP_XATTR_EXCL)) {
 697                if (ci->i_version == 0 ||
 698                    timespec64_compare(ctime, &inode->i_ctime) > 0) {
 699                        dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 700                             inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 701                             ctime->tv_sec, ctime->tv_nsec);
 702                        inode->i_ctime = *ctime;
 703                }
 704                if (ci->i_version == 0 ||
 705                    ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 706                        /* the MDS did a utimes() */
 707                        dout("mtime %lld.%09ld -> %lld.%09ld "
 708                             "tw %d -> %d\n",
 709                             inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 710                             mtime->tv_sec, mtime->tv_nsec,
 711                             ci->i_time_warp_seq, (int)time_warp_seq);
 712
 713                        inode->i_mtime = *mtime;
 714                        inode->i_atime = *atime;
 715                        ci->i_time_warp_seq = time_warp_seq;
 716                } else if (time_warp_seq == ci->i_time_warp_seq) {
 717                        /* nobody did utimes(); take the max */
 718                        if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 719                                dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 720                                     inode->i_mtime.tv_sec,
 721                                     inode->i_mtime.tv_nsec,
 722                                     mtime->tv_sec, mtime->tv_nsec);
 723                                inode->i_mtime = *mtime;
 724                        }
 725                        if (timespec64_compare(atime, &inode->i_atime) > 0) {
 726                                dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 727                                     inode->i_atime.tv_sec,
 728                                     inode->i_atime.tv_nsec,
 729                                     atime->tv_sec, atime->tv_nsec);
 730                                inode->i_atime = *atime;
 731                        }
 732                } else if (issued & CEPH_CAP_FILE_EXCL) {
 733                        /* we did a utimes(); ignore mds values */
 734                } else {
 735                        warn = 1;
 736                }
 737        } else {
 738                /* we have no write|excl caps; whatever the MDS says is true */
 739                if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 740                        inode->i_ctime = *ctime;
 741                        inode->i_mtime = *mtime;
 742                        inode->i_atime = *atime;
 743                        ci->i_time_warp_seq = time_warp_seq;
 744                } else {
 745                        warn = 1;
 746                }
 747        }
 748        if (warn) /* time_warp_seq shouldn't go backwards */
 749                dout("%p mds time_warp_seq %llu < %u\n",
 750                     inode, time_warp_seq, ci->i_time_warp_seq);
 751}
 752
 753/*
 754 * Populate an inode based on info from mds.  May be called on new or
 755 * existing inodes.
 756 */
 757int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 758                    struct ceph_mds_reply_info_in *iinfo,
 759                    struct ceph_mds_reply_dirfrag *dirinfo,
 760                    struct ceph_mds_session *session, int cap_fmode,
 761                    struct ceph_cap_reservation *caps_reservation)
 762{
 763        struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 764        struct ceph_mds_reply_inode *info = iinfo->in;
 765        struct ceph_inode_info *ci = ceph_inode(inode);
 766        int issued, new_issued, info_caps;
 767        struct timespec64 mtime, atime, ctime;
 768        struct ceph_buffer *xattr_blob = NULL;
 769        struct ceph_buffer *old_blob = NULL;
 770        struct ceph_string *pool_ns = NULL;
 771        struct ceph_cap *new_cap = NULL;
 772        int err = 0;
 773        bool wake = false;
 774        bool queue_trunc = false;
 775        bool new_version = false;
 776        bool fill_inline = false;
 777        umode_t mode = le32_to_cpu(info->mode);
 778        dev_t rdev = le32_to_cpu(info->rdev);
 779
 780        lockdep_assert_held(&mdsc->snap_rwsem);
 781
 782        dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
 783             inode, ceph_vinop(inode), le64_to_cpu(info->version),
 784             ci->i_version);
 785
 786        /* Once I_NEW is cleared, we can't change type or dev numbers */
 787        if (inode->i_state & I_NEW) {
 788                inode->i_mode = mode;
 789        } else {
 790                if (inode_wrong_type(inode, mode)) {
 791                        pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 792                                     ceph_vinop(inode), inode->i_mode, mode);
 793                        return -ESTALE;
 794                }
 795
 796                if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 797                        pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 798                                     ceph_vinop(inode), MAJOR(inode->i_rdev),
 799                                     MINOR(inode->i_rdev), MAJOR(rdev),
 800                                     MINOR(rdev));
 801                        return -ESTALE;
 802                }
 803        }
 804
 805        info_caps = le32_to_cpu(info->cap.caps);
 806
 807        /* prealloc new cap struct */
 808        if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 809                new_cap = ceph_get_cap(mdsc, caps_reservation);
 810                if (!new_cap)
 811                        return -ENOMEM;
 812        }
 813
 814        /*
 815         * prealloc xattr data, if it looks like we'll need it.  only
 816         * if len > 4 (meaning there are actually xattrs; the first 4
 817         * bytes are the xattr count).
 818         */
 819        if (iinfo->xattr_len > 4) {
 820                xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 821                if (!xattr_blob)
 822                        pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
 823                               iinfo->xattr_len);
 824        }
 825
 826        if (iinfo->pool_ns_len > 0)
 827                pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 828                                                     iinfo->pool_ns_len);
 829
 830        if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 831                ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 832
 833        spin_lock(&ci->i_ceph_lock);
 834
 835        /*
 836         * provided version will be odd if inode value is projected,
 837         * even if stable.  skip the update if we have newer stable
 838         * info (ours>=theirs, e.g. due to racing mds replies), unless
 839         * we are getting projected (unstable) info (in which case the
 840         * version is odd, and we want ours>theirs).
 841         *   us   them
 842         *   2    2     skip
 843         *   3    2     skip
 844         *   3    3     update
 845         */
 846        if (ci->i_version == 0 ||
 847            ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 848             le64_to_cpu(info->version) > (ci->i_version & ~1)))
 849                new_version = true;
 850
 851        /* Update change_attribute */
 852        inode_set_max_iversion_raw(inode, iinfo->change_attr);
 853
 854        __ceph_caps_issued(ci, &issued);
 855        issued |= __ceph_caps_dirty(ci);
 856        new_issued = ~issued & info_caps;
 857
 858        /* directories have fl_stripe_unit set to zero */
 859        if (le32_to_cpu(info->layout.fl_stripe_unit))
 860                inode->i_blkbits =
 861                        fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 862        else
 863                inode->i_blkbits = CEPH_BLOCK_SHIFT;
 864
 865        __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 866
 867        if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 868            (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 869                inode->i_mode = mode;
 870                inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 871                inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 872                dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 873                     from_kuid(&init_user_ns, inode->i_uid),
 874                     from_kgid(&init_user_ns, inode->i_gid));
 875                ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
 876                ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 877        }
 878
 879        if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 880            (issued & CEPH_CAP_LINK_EXCL) == 0)
 881                set_nlink(inode, le32_to_cpu(info->nlink));
 882
 883        if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 884                /* be careful with mtime, atime, size */
 885                ceph_decode_timespec64(&atime, &info->atime);
 886                ceph_decode_timespec64(&mtime, &info->mtime);
 887                ceph_decode_timespec64(&ctime, &info->ctime);
 888                ceph_fill_file_time(inode, issued,
 889                                le32_to_cpu(info->time_warp_seq),
 890                                &ctime, &mtime, &atime);
 891        }
 892
 893        if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 894                ci->i_files = le64_to_cpu(info->files);
 895                ci->i_subdirs = le64_to_cpu(info->subdirs);
 896        }
 897
 898        if (new_version ||
 899            (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 900                s64 old_pool = ci->i_layout.pool_id;
 901                struct ceph_string *old_ns;
 902
 903                ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 904                old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 905                                        lockdep_is_held(&ci->i_ceph_lock));
 906                rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 907
 908                if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 909                        ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 910
 911                pool_ns = old_ns;
 912
 913                queue_trunc = ceph_fill_file_size(inode, issued,
 914                                        le32_to_cpu(info->truncate_seq),
 915                                        le64_to_cpu(info->truncate_size),
 916                                        le64_to_cpu(info->size));
 917                /* only update max_size on auth cap */
 918                if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 919                    ci->i_max_size != le64_to_cpu(info->max_size)) {
 920                        dout("max_size %lld -> %llu\n", ci->i_max_size,
 921                                        le64_to_cpu(info->max_size));
 922                        ci->i_max_size = le64_to_cpu(info->max_size);
 923                }
 924        }
 925
 926        /* layout and rstat are not tracked by capability, update them if
 927         * the inode info is from auth mds */
 928        if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 929                if (S_ISDIR(inode->i_mode)) {
 930                        ci->i_dir_layout = iinfo->dir_layout;
 931                        ci->i_rbytes = le64_to_cpu(info->rbytes);
 932                        ci->i_rfiles = le64_to_cpu(info->rfiles);
 933                        ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 934                        ci->i_dir_pin = iinfo->dir_pin;
 935                        ci->i_rsnaps = iinfo->rsnaps;
 936                        ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 937                }
 938        }
 939
 940        /* xattrs */
 941        /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 942        if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 943            le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 944                if (ci->i_xattrs.blob)
 945                        old_blob = ci->i_xattrs.blob;
 946                ci->i_xattrs.blob = xattr_blob;
 947                if (xattr_blob)
 948                        memcpy(ci->i_xattrs.blob->vec.iov_base,
 949                               iinfo->xattr_data, iinfo->xattr_len);
 950                ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 951                ceph_forget_all_cached_acls(inode);
 952                ceph_security_invalidate_secctx(inode);
 953                xattr_blob = NULL;
 954        }
 955
 956        /* finally update i_version */
 957        if (le64_to_cpu(info->version) > ci->i_version)
 958                ci->i_version = le64_to_cpu(info->version);
 959
 960        inode->i_mapping->a_ops = &ceph_aops;
 961
 962        switch (inode->i_mode & S_IFMT) {
 963        case S_IFIFO:
 964        case S_IFBLK:
 965        case S_IFCHR:
 966        case S_IFSOCK:
 967                inode->i_blkbits = PAGE_SHIFT;
 968                init_special_inode(inode, inode->i_mode, rdev);
 969                inode->i_op = &ceph_file_iops;
 970                break;
 971        case S_IFREG:
 972                inode->i_op = &ceph_file_iops;
 973                inode->i_fop = &ceph_file_fops;
 974                break;
 975        case S_IFLNK:
 976                inode->i_op = &ceph_symlink_iops;
 977                if (!ci->i_symlink) {
 978                        u32 symlen = iinfo->symlink_len;
 979                        char *sym;
 980
 981                        spin_unlock(&ci->i_ceph_lock);
 982
 983                        if (symlen != i_size_read(inode)) {
 984                                pr_err("%s %llx.%llx BAD symlink "
 985                                        "size %lld\n", __func__,
 986                                        ceph_vinop(inode),
 987                                        i_size_read(inode));
 988                                i_size_write(inode, symlen);
 989                                inode->i_blocks = calc_inode_blocks(symlen);
 990                        }
 991
 992                        err = -ENOMEM;
 993                        sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 994                        if (!sym)
 995                                goto out;
 996
 997                        spin_lock(&ci->i_ceph_lock);
 998                        if (!ci->i_symlink)
 999                                ci->i_symlink = sym;
1000                        else
1001                                kfree(sym); /* lost a race */
1002                }
1003                inode->i_link = ci->i_symlink;
1004                break;
1005        case S_IFDIR:
1006                inode->i_op = &ceph_dir_iops;
1007                inode->i_fop = &ceph_dir_fops;
1008                break;
1009        default:
1010                pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
1011                       ceph_vinop(inode), inode->i_mode);
1012        }
1013
1014        /* were we issued a capability? */
1015        if (info_caps) {
1016                if (ceph_snap(inode) == CEPH_NOSNAP) {
1017                        ceph_add_cap(inode, session,
1018                                     le64_to_cpu(info->cap.cap_id),
1019                                     info_caps,
1020                                     le32_to_cpu(info->cap.wanted),
1021                                     le32_to_cpu(info->cap.seq),
1022                                     le32_to_cpu(info->cap.mseq),
1023                                     le64_to_cpu(info->cap.realm),
1024                                     info->cap.flags, &new_cap);
1025
1026                        /* set dir completion flag? */
1027                        if (S_ISDIR(inode->i_mode) &&
1028                            ci->i_files == 0 && ci->i_subdirs == 0 &&
1029                            (info_caps & CEPH_CAP_FILE_SHARED) &&
1030                            (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1031                            !__ceph_dir_is_complete(ci)) {
1032                                dout(" marking %p complete (empty)\n", inode);
1033                                i_size_write(inode, 0);
1034                                __ceph_dir_set_complete(ci,
1035                                        atomic64_read(&ci->i_release_count),
1036                                        atomic64_read(&ci->i_ordered_count));
1037                        }
1038
1039                        wake = true;
1040                } else {
1041                        dout(" %p got snap_caps %s\n", inode,
1042                             ceph_cap_string(info_caps));
1043                        ci->i_snap_caps |= info_caps;
1044                }
1045        }
1046
1047        if (iinfo->inline_version > 0 &&
1048            iinfo->inline_version >= ci->i_inline_version) {
1049                int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1050                ci->i_inline_version = iinfo->inline_version;
1051                if (ci->i_inline_version != CEPH_INLINE_NONE &&
1052                    (locked_page || (info_caps & cache_caps)))
1053                        fill_inline = true;
1054        }
1055
1056        if (cap_fmode >= 0) {
1057                if (!info_caps)
1058                        pr_warn("mds issued no caps on %llx.%llx\n",
1059                                ceph_vinop(inode));
1060                __ceph_touch_fmode(ci, mdsc, cap_fmode);
1061        }
1062
1063        spin_unlock(&ci->i_ceph_lock);
1064
1065        if (fill_inline)
1066                ceph_fill_inline_data(inode, locked_page,
1067                                      iinfo->inline_data, iinfo->inline_len);
1068
1069        if (wake)
1070                wake_up_all(&ci->i_cap_wq);
1071
1072        /* queue truncate if we saw i_size decrease */
1073        if (queue_trunc)
1074                ceph_queue_vmtruncate(inode);
1075
1076        /* populate frag tree */
1077        if (S_ISDIR(inode->i_mode))
1078                ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1079
1080        /* update delegation info? */
1081        if (dirinfo)
1082                ceph_fill_dirfrag(inode, dirinfo);
1083
1084        err = 0;
1085out:
1086        if (new_cap)
1087                ceph_put_cap(mdsc, new_cap);
1088        ceph_buffer_put(old_blob);
1089        ceph_buffer_put(xattr_blob);
1090        ceph_put_string(pool_ns);
1091        return err;
1092}
1093
1094/*
1095 * caller should hold session s_mutex and dentry->d_lock.
1096 */
1097static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1098                                  struct ceph_mds_reply_lease *lease,
1099                                  struct ceph_mds_session *session,
1100                                  unsigned long from_time,
1101                                  struct ceph_mds_session **old_lease_session)
1102{
1103        struct ceph_dentry_info *di = ceph_dentry(dentry);
1104        unsigned mask = le16_to_cpu(lease->mask);
1105        long unsigned duration = le32_to_cpu(lease->duration_ms);
1106        long unsigned ttl = from_time + (duration * HZ) / 1000;
1107        long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1108
1109        dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1110             dentry, duration, ttl);
1111
1112        /* only track leases on regular dentries */
1113        if (ceph_snap(dir) != CEPH_NOSNAP)
1114                return;
1115
1116        if (mask & CEPH_LEASE_PRIMARY_LINK)
1117                di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1118        else
1119                di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1120
1121        di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1122        if (!(mask & CEPH_LEASE_VALID)) {
1123                __ceph_dentry_dir_lease_touch(di);
1124                return;
1125        }
1126
1127        if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1128            time_before(ttl, di->time))
1129                return;  /* we already have a newer lease. */
1130
1131        if (di->lease_session && di->lease_session != session) {
1132                *old_lease_session = di->lease_session;
1133                di->lease_session = NULL;
1134        }
1135
1136        if (!di->lease_session)
1137                di->lease_session = ceph_get_mds_session(session);
1138        di->lease_gen = atomic_read(&session->s_cap_gen);
1139        di->lease_seq = le32_to_cpu(lease->seq);
1140        di->lease_renew_after = half_ttl;
1141        di->lease_renew_from = 0;
1142        di->time = ttl;
1143
1144        __ceph_dentry_lease_touch(di);
1145}
1146
1147static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1148                                        struct ceph_mds_reply_lease *lease,
1149                                        struct ceph_mds_session *session,
1150                                        unsigned long from_time)
1151{
1152        struct ceph_mds_session *old_lease_session = NULL;
1153        spin_lock(&dentry->d_lock);
1154        __update_dentry_lease(dir, dentry, lease, session, from_time,
1155                              &old_lease_session);
1156        spin_unlock(&dentry->d_lock);
1157        ceph_put_mds_session(old_lease_session);
1158}
1159
1160/*
1161 * update dentry lease without having parent inode locked
1162 */
1163static void update_dentry_lease_careful(struct dentry *dentry,
1164                                        struct ceph_mds_reply_lease *lease,
1165                                        struct ceph_mds_session *session,
1166                                        unsigned long from_time,
1167                                        char *dname, u32 dname_len,
1168                                        struct ceph_vino *pdvino,
1169                                        struct ceph_vino *ptvino)
1170
1171{
1172        struct inode *dir;
1173        struct ceph_mds_session *old_lease_session = NULL;
1174
1175        spin_lock(&dentry->d_lock);
1176        /* make sure dentry's name matches target */
1177        if (dentry->d_name.len != dname_len ||
1178            memcmp(dentry->d_name.name, dname, dname_len))
1179                goto out_unlock;
1180
1181        dir = d_inode(dentry->d_parent);
1182        /* make sure parent matches dvino */
1183        if (!ceph_ino_compare(dir, pdvino))
1184                goto out_unlock;
1185
1186        /* make sure dentry's inode matches target. NULL ptvino means that
1187         * we expect a negative dentry */
1188        if (ptvino) {
1189                if (d_really_is_negative(dentry))
1190                        goto out_unlock;
1191                if (!ceph_ino_compare(d_inode(dentry), ptvino))
1192                        goto out_unlock;
1193        } else {
1194                if (d_really_is_positive(dentry))
1195                        goto out_unlock;
1196        }
1197
1198        __update_dentry_lease(dir, dentry, lease, session,
1199                              from_time, &old_lease_session);
1200out_unlock:
1201        spin_unlock(&dentry->d_lock);
1202        ceph_put_mds_session(old_lease_session);
1203}
1204
1205/*
1206 * splice a dentry to an inode.
1207 * caller must hold directory i_mutex for this to be safe.
1208 */
1209static int splice_dentry(struct dentry **pdn, struct inode *in)
1210{
1211        struct dentry *dn = *pdn;
1212        struct dentry *realdn;
1213
1214        BUG_ON(d_inode(dn));
1215
1216        if (S_ISDIR(in->i_mode)) {
1217                /* If inode is directory, d_splice_alias() below will remove
1218                 * 'realdn' from its origin parent. We need to ensure that
1219                 * origin parent's readdir cache will not reference 'realdn'
1220                 */
1221                realdn = d_find_any_alias(in);
1222                if (realdn) {
1223                        struct ceph_dentry_info *di = ceph_dentry(realdn);
1224                        spin_lock(&realdn->d_lock);
1225
1226                        realdn->d_op->d_prune(realdn);
1227
1228                        di->time = jiffies;
1229                        di->lease_shared_gen = 0;
1230                        di->offset = 0;
1231
1232                        spin_unlock(&realdn->d_lock);
1233                        dput(realdn);
1234                }
1235        }
1236
1237        /* dn must be unhashed */
1238        if (!d_unhashed(dn))
1239                d_drop(dn);
1240        realdn = d_splice_alias(in, dn);
1241        if (IS_ERR(realdn)) {
1242                pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1243                       PTR_ERR(realdn), dn, in, ceph_vinop(in));
1244                return PTR_ERR(realdn);
1245        }
1246
1247        if (realdn) {
1248                dout("dn %p (%d) spliced with %p (%d) "
1249                     "inode %p ino %llx.%llx\n",
1250                     dn, d_count(dn),
1251                     realdn, d_count(realdn),
1252                     d_inode(realdn), ceph_vinop(d_inode(realdn)));
1253                dput(dn);
1254                *pdn = realdn;
1255        } else {
1256                BUG_ON(!ceph_dentry(dn));
1257                dout("dn %p attached to %p ino %llx.%llx\n",
1258                     dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1259        }
1260        return 0;
1261}
1262
1263/*
1264 * Incorporate results into the local cache.  This is either just
1265 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1266 * after a lookup).
1267 *
1268 * A reply may contain
1269 *         a directory inode along with a dentry.
1270 *  and/or a target inode
1271 *
1272 * Called with snap_rwsem (read).
1273 */
1274int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1275{
1276        struct ceph_mds_session *session = req->r_session;
1277        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1278        struct inode *in = NULL;
1279        struct ceph_vino tvino, dvino;
1280        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1281        int err = 0;
1282
1283        dout("fill_trace %p is_dentry %d is_target %d\n", req,
1284             rinfo->head->is_dentry, rinfo->head->is_target);
1285
1286        if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1287                dout("fill_trace reply is empty!\n");
1288                if (rinfo->head->result == 0 && req->r_parent)
1289                        ceph_invalidate_dir_request(req);
1290                return 0;
1291        }
1292
1293        if (rinfo->head->is_dentry) {
1294                struct inode *dir = req->r_parent;
1295
1296                if (dir) {
1297                        err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1298                                              rinfo->dirfrag, session, -1,
1299                                              &req->r_caps_reservation);
1300                        if (err < 0)
1301                                goto done;
1302                } else {
1303                        WARN_ON_ONCE(1);
1304                }
1305
1306                if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1307                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1308                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1309                        struct qstr dname;
1310                        struct dentry *dn, *parent;
1311
1312                        BUG_ON(!rinfo->head->is_target);
1313                        BUG_ON(req->r_dentry);
1314
1315                        parent = d_find_any_alias(dir);
1316                        BUG_ON(!parent);
1317
1318                        dname.name = rinfo->dname;
1319                        dname.len = rinfo->dname_len;
1320                        dname.hash = full_name_hash(parent, dname.name, dname.len);
1321                        tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1322                        tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1323retry_lookup:
1324                        dn = d_lookup(parent, &dname);
1325                        dout("d_lookup on parent=%p name=%.*s got %p\n",
1326                             parent, dname.len, dname.name, dn);
1327
1328                        if (!dn) {
1329                                dn = d_alloc(parent, &dname);
1330                                dout("d_alloc %p '%.*s' = %p\n", parent,
1331                                     dname.len, dname.name, dn);
1332                                if (!dn) {
1333                                        dput(parent);
1334                                        err = -ENOMEM;
1335                                        goto done;
1336                                }
1337                                err = 0;
1338                        } else if (d_really_is_positive(dn) &&
1339                                   (ceph_ino(d_inode(dn)) != tvino.ino ||
1340                                    ceph_snap(d_inode(dn)) != tvino.snap)) {
1341                                dout(" dn %p points to wrong inode %p\n",
1342                                     dn, d_inode(dn));
1343                                ceph_dir_clear_ordered(dir);
1344                                d_delete(dn);
1345                                dput(dn);
1346                                goto retry_lookup;
1347                        }
1348
1349                        req->r_dentry = dn;
1350                        dput(parent);
1351                }
1352        }
1353
1354        if (rinfo->head->is_target) {
1355                /* Should be filled in by handle_reply */
1356                BUG_ON(!req->r_target_inode);
1357
1358                in = req->r_target_inode;
1359                err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1360                                NULL, session,
1361                                (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1362                                 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1363                                 rinfo->head->result == 0) ?  req->r_fmode : -1,
1364                                &req->r_caps_reservation);
1365                if (err < 0) {
1366                        pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1367                                in, ceph_vinop(in));
1368                        req->r_target_inode = NULL;
1369                        if (in->i_state & I_NEW)
1370                                discard_new_inode(in);
1371                        else
1372                                iput(in);
1373                        goto done;
1374                }
1375                if (in->i_state & I_NEW)
1376                        unlock_new_inode(in);
1377        }
1378
1379        /*
1380         * ignore null lease/binding on snapdir ENOENT, or else we
1381         * will have trouble splicing in the virtual snapdir later
1382         */
1383        if (rinfo->head->is_dentry &&
1384            !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1385            test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1386            (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1387                                               fsc->mount_options->snapdir_name,
1388                                               req->r_dentry->d_name.len))) {
1389                /*
1390                 * lookup link rename   : null -> possibly existing inode
1391                 * mknod symlink mkdir  : null -> new inode
1392                 * unlink               : linked -> null
1393                 */
1394                struct inode *dir = req->r_parent;
1395                struct dentry *dn = req->r_dentry;
1396                bool have_dir_cap, have_lease;
1397
1398                BUG_ON(!dn);
1399                BUG_ON(!dir);
1400                BUG_ON(d_inode(dn->d_parent) != dir);
1401
1402                dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1403                dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1404
1405                BUG_ON(ceph_ino(dir) != dvino.ino);
1406                BUG_ON(ceph_snap(dir) != dvino.snap);
1407
1408                /* do we have a lease on the whole dir? */
1409                have_dir_cap =
1410                        (le32_to_cpu(rinfo->diri.in->cap.caps) &
1411                         CEPH_CAP_FILE_SHARED);
1412
1413                /* do we have a dn lease? */
1414                have_lease = have_dir_cap ||
1415                        le32_to_cpu(rinfo->dlease->duration_ms);
1416                if (!have_lease)
1417                        dout("fill_trace  no dentry lease or dir cap\n");
1418
1419                /* rename? */
1420                if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1421                        struct inode *olddir = req->r_old_dentry_dir;
1422                        BUG_ON(!olddir);
1423
1424                        dout(" src %p '%pd' dst %p '%pd'\n",
1425                             req->r_old_dentry,
1426                             req->r_old_dentry,
1427                             dn, dn);
1428                        dout("fill_trace doing d_move %p -> %p\n",
1429                             req->r_old_dentry, dn);
1430
1431                        /* d_move screws up sibling dentries' offsets */
1432                        ceph_dir_clear_ordered(dir);
1433                        ceph_dir_clear_ordered(olddir);
1434
1435                        d_move(req->r_old_dentry, dn);
1436                        dout(" src %p '%pd' dst %p '%pd'\n",
1437                             req->r_old_dentry,
1438                             req->r_old_dentry,
1439                             dn, dn);
1440
1441                        /* ensure target dentry is invalidated, despite
1442                           rehashing bug in vfs_rename_dir */
1443                        ceph_invalidate_dentry_lease(dn);
1444
1445                        dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1446                             ceph_dentry(req->r_old_dentry)->offset);
1447
1448                        /* swap r_dentry and r_old_dentry in case that
1449                         * splice_dentry() gets called later. This is safe
1450                         * because no other place will use them */
1451                        req->r_dentry = req->r_old_dentry;
1452                        req->r_old_dentry = dn;
1453                        dn = req->r_dentry;
1454                }
1455
1456                /* null dentry? */
1457                if (!rinfo->head->is_target) {
1458                        dout("fill_trace null dentry\n");
1459                        if (d_really_is_positive(dn)) {
1460                                dout("d_delete %p\n", dn);
1461                                ceph_dir_clear_ordered(dir);
1462                                d_delete(dn);
1463                        } else if (have_lease) {
1464                                if (d_unhashed(dn))
1465                                        d_add(dn, NULL);
1466                                update_dentry_lease(dir, dn,
1467                                                    rinfo->dlease, session,
1468                                                    req->r_request_started);
1469                        }
1470                        goto done;
1471                }
1472
1473                /* attach proper inode */
1474                if (d_really_is_negative(dn)) {
1475                        ceph_dir_clear_ordered(dir);
1476                        ihold(in);
1477                        err = splice_dentry(&req->r_dentry, in);
1478                        if (err < 0)
1479                                goto done;
1480                        dn = req->r_dentry;  /* may have spliced */
1481                } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1482                        dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1483                             dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1484                             ceph_vinop(in));
1485                        d_invalidate(dn);
1486                        have_lease = false;
1487                }
1488
1489                if (have_lease) {
1490                        update_dentry_lease(dir, dn,
1491                                            rinfo->dlease, session,
1492                                            req->r_request_started);
1493                }
1494                dout(" final dn %p\n", dn);
1495        } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1496                    req->r_op == CEPH_MDS_OP_MKSNAP) &&
1497                   test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1498                   !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1499                struct inode *dir = req->r_parent;
1500
1501                /* fill out a snapdir LOOKUPSNAP dentry */
1502                BUG_ON(!dir);
1503                BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1504                BUG_ON(!req->r_dentry);
1505                dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1506                ceph_dir_clear_ordered(dir);
1507                ihold(in);
1508                err = splice_dentry(&req->r_dentry, in);
1509                if (err < 0)
1510                        goto done;
1511        } else if (rinfo->head->is_dentry && req->r_dentry) {
1512                /* parent inode is not locked, be carefull */
1513                struct ceph_vino *ptvino = NULL;
1514                dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1515                dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1516                if (rinfo->head->is_target) {
1517                        tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1518                        tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1519                        ptvino = &tvino;
1520                }
1521                update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1522                                            session, req->r_request_started,
1523                                            rinfo->dname, rinfo->dname_len,
1524                                            &dvino, ptvino);
1525        }
1526done:
1527        dout("fill_trace done err=%d\n", err);
1528        return err;
1529}
1530
1531/*
1532 * Prepopulate our cache with readdir results, leases, etc.
1533 */
1534static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1535                                           struct ceph_mds_session *session)
1536{
1537        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1538        int i, err = 0;
1539
1540        for (i = 0; i < rinfo->dir_nr; i++) {
1541                struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1542                struct ceph_vino vino;
1543                struct inode *in;
1544                int rc;
1545
1546                vino.ino = le64_to_cpu(rde->inode.in->ino);
1547                vino.snap = le64_to_cpu(rde->inode.in->snapid);
1548
1549                in = ceph_get_inode(req->r_dentry->d_sb, vino);
1550                if (IS_ERR(in)) {
1551                        err = PTR_ERR(in);
1552                        dout("new_inode badness got %d\n", err);
1553                        continue;
1554                }
1555                rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1556                                     -1, &req->r_caps_reservation);
1557                if (rc < 0) {
1558                        pr_err("ceph_fill_inode badness on %p got %d\n",
1559                               in, rc);
1560                        err = rc;
1561                        if (in->i_state & I_NEW) {
1562                                ihold(in);
1563                                discard_new_inode(in);
1564                        }
1565                } else if (in->i_state & I_NEW) {
1566                        unlock_new_inode(in);
1567                }
1568
1569                iput(in);
1570        }
1571
1572        return err;
1573}
1574
1575void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1576{
1577        if (ctl->page) {
1578                kunmap(ctl->page);
1579                put_page(ctl->page);
1580                ctl->page = NULL;
1581        }
1582}
1583
1584static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1585                              struct ceph_readdir_cache_control *ctl,
1586                              struct ceph_mds_request *req)
1587{
1588        struct ceph_inode_info *ci = ceph_inode(dir);
1589        unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1590        unsigned idx = ctl->index % nsize;
1591        pgoff_t pgoff = ctl->index / nsize;
1592
1593        if (!ctl->page || pgoff != page_index(ctl->page)) {
1594                ceph_readdir_cache_release(ctl);
1595                if (idx == 0)
1596                        ctl->page = grab_cache_page(&dir->i_data, pgoff);
1597                else
1598                        ctl->page = find_lock_page(&dir->i_data, pgoff);
1599                if (!ctl->page) {
1600                        ctl->index = -1;
1601                        return idx == 0 ? -ENOMEM : 0;
1602                }
1603                /* reading/filling the cache are serialized by
1604                 * i_mutex, no need to use page lock */
1605                unlock_page(ctl->page);
1606                ctl->dentries = kmap(ctl->page);
1607                if (idx == 0)
1608                        memset(ctl->dentries, 0, PAGE_SIZE);
1609        }
1610
1611        if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1612            req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1613                dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1614                ctl->dentries[idx] = dn;
1615                ctl->index++;
1616        } else {
1617                dout("disable readdir cache\n");
1618                ctl->index = -1;
1619        }
1620        return 0;
1621}
1622
1623int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1624                             struct ceph_mds_session *session)
1625{
1626        struct dentry *parent = req->r_dentry;
1627        struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1628        struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1629        struct qstr dname;
1630        struct dentry *dn;
1631        struct inode *in;
1632        int err = 0, skipped = 0, ret, i;
1633        u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1634        u32 last_hash = 0;
1635        u32 fpos_offset;
1636        struct ceph_readdir_cache_control cache_ctl = {};
1637
1638        if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1639                return readdir_prepopulate_inodes_only(req, session);
1640
1641        if (rinfo->hash_order) {
1642                if (req->r_path2) {
1643                        last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1644                                                  req->r_path2,
1645                                                  strlen(req->r_path2));
1646                        last_hash = ceph_frag_value(last_hash);
1647                } else if (rinfo->offset_hash) {
1648                        /* mds understands offset_hash */
1649                        WARN_ON_ONCE(req->r_readdir_offset != 2);
1650                        last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1651                }
1652        }
1653
1654        if (rinfo->dir_dir &&
1655            le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1656                dout("readdir_prepopulate got new frag %x -> %x\n",
1657                     frag, le32_to_cpu(rinfo->dir_dir->frag));
1658                frag = le32_to_cpu(rinfo->dir_dir->frag);
1659                if (!rinfo->hash_order)
1660                        req->r_readdir_offset = 2;
1661        }
1662
1663        if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1664                dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1665                     rinfo->dir_nr, parent);
1666        } else {
1667                dout("readdir_prepopulate %d items under dn %p\n",
1668                     rinfo->dir_nr, parent);
1669                if (rinfo->dir_dir)
1670                        ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1671
1672                if (ceph_frag_is_leftmost(frag) &&
1673                    req->r_readdir_offset == 2 &&
1674                    !(rinfo->hash_order && last_hash)) {
1675                        /* note dir version at start of readdir so we can
1676                         * tell if any dentries get dropped */
1677                        req->r_dir_release_cnt =
1678                                atomic64_read(&ci->i_release_count);
1679                        req->r_dir_ordered_cnt =
1680                                atomic64_read(&ci->i_ordered_count);
1681                        req->r_readdir_cache_idx = 0;
1682                }
1683        }
1684
1685        cache_ctl.index = req->r_readdir_cache_idx;
1686        fpos_offset = req->r_readdir_offset;
1687
1688        /* FIXME: release caps/leases if error occurs */
1689        for (i = 0; i < rinfo->dir_nr; i++) {
1690                struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1691                struct ceph_vino tvino;
1692
1693                dname.name = rde->name;
1694                dname.len = rde->name_len;
1695                dname.hash = full_name_hash(parent, dname.name, dname.len);
1696
1697                tvino.ino = le64_to_cpu(rde->inode.in->ino);
1698                tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1699
1700                if (rinfo->hash_order) {
1701                        u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1702                                                 rde->name, rde->name_len);
1703                        hash = ceph_frag_value(hash);
1704                        if (hash != last_hash)
1705                                fpos_offset = 2;
1706                        last_hash = hash;
1707                        rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1708                } else {
1709                        rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1710                }
1711
1712retry_lookup:
1713                dn = d_lookup(parent, &dname);
1714                dout("d_lookup on parent=%p name=%.*s got %p\n",
1715                     parent, dname.len, dname.name, dn);
1716
1717                if (!dn) {
1718                        dn = d_alloc(parent, &dname);
1719                        dout("d_alloc %p '%.*s' = %p\n", parent,
1720                             dname.len, dname.name, dn);
1721                        if (!dn) {
1722                                dout("d_alloc badness\n");
1723                                err = -ENOMEM;
1724                                goto out;
1725                        }
1726                } else if (d_really_is_positive(dn) &&
1727                           (ceph_ino(d_inode(dn)) != tvino.ino ||
1728                            ceph_snap(d_inode(dn)) != tvino.snap)) {
1729                        struct ceph_dentry_info *di = ceph_dentry(dn);
1730                        dout(" dn %p points to wrong inode %p\n",
1731                             dn, d_inode(dn));
1732
1733                        spin_lock(&dn->d_lock);
1734                        if (di->offset > 0 &&
1735                            di->lease_shared_gen ==
1736                            atomic_read(&ci->i_shared_gen)) {
1737                                __ceph_dir_clear_ordered(ci);
1738                                di->offset = 0;
1739                        }
1740                        spin_unlock(&dn->d_lock);
1741
1742                        d_delete(dn);
1743                        dput(dn);
1744                        goto retry_lookup;
1745                }
1746
1747                /* inode */
1748                if (d_really_is_positive(dn)) {
1749                        in = d_inode(dn);
1750                } else {
1751                        in = ceph_get_inode(parent->d_sb, tvino);
1752                        if (IS_ERR(in)) {
1753                                dout("new_inode badness\n");
1754                                d_drop(dn);
1755                                dput(dn);
1756                                err = PTR_ERR(in);
1757                                goto out;
1758                        }
1759                }
1760
1761                ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1762                                      -1, &req->r_caps_reservation);
1763                if (ret < 0) {
1764                        pr_err("ceph_fill_inode badness on %p\n", in);
1765                        if (d_really_is_negative(dn)) {
1766                                if (in->i_state & I_NEW) {
1767                                        ihold(in);
1768                                        discard_new_inode(in);
1769                                }
1770                                iput(in);
1771                        }
1772                        d_drop(dn);
1773                        err = ret;
1774                        goto next_item;
1775                }
1776                if (in->i_state & I_NEW)
1777                        unlock_new_inode(in);
1778
1779                if (d_really_is_negative(dn)) {
1780                        if (ceph_security_xattr_deadlock(in)) {
1781                                dout(" skip splicing dn %p to inode %p"
1782                                     " (security xattr deadlock)\n", dn, in);
1783                                iput(in);
1784                                skipped++;
1785                                goto next_item;
1786                        }
1787
1788                        err = splice_dentry(&dn, in);
1789                        if (err < 0)
1790                                goto next_item;
1791                }
1792
1793                ceph_dentry(dn)->offset = rde->offset;
1794
1795                update_dentry_lease(d_inode(parent), dn,
1796                                    rde->lease, req->r_session,
1797                                    req->r_request_started);
1798
1799                if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1800                        ret = fill_readdir_cache(d_inode(parent), dn,
1801                                                 &cache_ctl, req);
1802                        if (ret < 0)
1803                                err = ret;
1804                }
1805next_item:
1806                dput(dn);
1807        }
1808out:
1809        if (err == 0 && skipped == 0) {
1810                set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1811                req->r_readdir_cache_idx = cache_ctl.index;
1812        }
1813        ceph_readdir_cache_release(&cache_ctl);
1814        dout("readdir_prepopulate done\n");
1815        return err;
1816}
1817
1818bool ceph_inode_set_size(struct inode *inode, loff_t size)
1819{
1820        struct ceph_inode_info *ci = ceph_inode(inode);
1821        bool ret;
1822
1823        spin_lock(&ci->i_ceph_lock);
1824        dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
1825        i_size_write(inode, size);
1826        inode->i_blocks = calc_inode_blocks(size);
1827
1828        ret = __ceph_should_report_size(ci);
1829
1830        spin_unlock(&ci->i_ceph_lock);
1831        return ret;
1832}
1833
1834void ceph_queue_inode_work(struct inode *inode, int work_bit)
1835{
1836        struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1837        struct ceph_inode_info *ci = ceph_inode(inode);
1838        set_bit(work_bit, &ci->i_work_mask);
1839
1840        ihold(inode);
1841        if (queue_work(fsc->inode_wq, &ci->i_work)) {
1842                dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
1843        } else {
1844                dout("queue_inode_work %p already queued, mask=%lx\n",
1845                     inode, ci->i_work_mask);
1846                iput(inode);
1847        }
1848}
1849
1850static void ceph_do_invalidate_pages(struct inode *inode)
1851{
1852        struct ceph_inode_info *ci = ceph_inode(inode);
1853        struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1854        u32 orig_gen;
1855        int check = 0;
1856
1857        mutex_lock(&ci->i_truncate_mutex);
1858
1859        if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
1860                pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1861                                    inode, ceph_ino(inode));
1862                mapping_set_error(inode->i_mapping, -EIO);
1863                truncate_pagecache(inode, 0);
1864                mutex_unlock(&ci->i_truncate_mutex);
1865                goto out;
1866        }
1867
1868        spin_lock(&ci->i_ceph_lock);
1869        dout("invalidate_pages %p gen %d revoking %d\n", inode,
1870             ci->i_rdcache_gen, ci->i_rdcache_revoking);
1871        if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1872                if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1873                        check = 1;
1874                spin_unlock(&ci->i_ceph_lock);
1875                mutex_unlock(&ci->i_truncate_mutex);
1876                goto out;
1877        }
1878        orig_gen = ci->i_rdcache_gen;
1879        spin_unlock(&ci->i_ceph_lock);
1880
1881        ceph_fscache_invalidate(inode);
1882        if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1883                pr_err("invalidate_pages %p fails\n", inode);
1884        }
1885
1886        spin_lock(&ci->i_ceph_lock);
1887        if (orig_gen == ci->i_rdcache_gen &&
1888            orig_gen == ci->i_rdcache_revoking) {
1889                dout("invalidate_pages %p gen %d successful\n", inode,
1890                     ci->i_rdcache_gen);
1891                ci->i_rdcache_revoking--;
1892                check = 1;
1893        } else {
1894                dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1895                     inode, orig_gen, ci->i_rdcache_gen,
1896                     ci->i_rdcache_revoking);
1897                if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1898                        check = 1;
1899        }
1900        spin_unlock(&ci->i_ceph_lock);
1901        mutex_unlock(&ci->i_truncate_mutex);
1902out:
1903        if (check)
1904                ceph_check_caps(ci, 0, NULL);
1905}
1906
1907/*
1908 * Make sure any pending truncation is applied before doing anything
1909 * that may depend on it.
1910 */
1911void __ceph_do_pending_vmtruncate(struct inode *inode)
1912{
1913        struct ceph_inode_info *ci = ceph_inode(inode);
1914        u64 to;
1915        int wrbuffer_refs, finish = 0;
1916
1917        mutex_lock(&ci->i_truncate_mutex);
1918retry:
1919        spin_lock(&ci->i_ceph_lock);
1920        if (ci->i_truncate_pending == 0) {
1921                dout("__do_pending_vmtruncate %p none pending\n", inode);
1922                spin_unlock(&ci->i_ceph_lock);
1923                mutex_unlock(&ci->i_truncate_mutex);
1924                return;
1925        }
1926
1927        /*
1928         * make sure any dirty snapped pages are flushed before we
1929         * possibly truncate them.. so write AND block!
1930         */
1931        if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1932                spin_unlock(&ci->i_ceph_lock);
1933                dout("__do_pending_vmtruncate %p flushing snaps first\n",
1934                     inode);
1935                filemap_write_and_wait_range(&inode->i_data, 0,
1936                                             inode->i_sb->s_maxbytes);
1937                goto retry;
1938        }
1939
1940        /* there should be no reader or writer */
1941        WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1942
1943        to = ci->i_truncate_size;
1944        wrbuffer_refs = ci->i_wrbuffer_ref;
1945        dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1946             ci->i_truncate_pending, to);
1947        spin_unlock(&ci->i_ceph_lock);
1948
1949        truncate_pagecache(inode, to);
1950
1951        spin_lock(&ci->i_ceph_lock);
1952        if (to == ci->i_truncate_size) {
1953                ci->i_truncate_pending = 0;
1954                finish = 1;
1955        }
1956        spin_unlock(&ci->i_ceph_lock);
1957        if (!finish)
1958                goto retry;
1959
1960        mutex_unlock(&ci->i_truncate_mutex);
1961
1962        if (wrbuffer_refs == 0)
1963                ceph_check_caps(ci, 0, NULL);
1964
1965        wake_up_all(&ci->i_cap_wq);
1966}
1967
1968static void ceph_inode_work(struct work_struct *work)
1969{
1970        struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1971                                                 i_work);
1972        struct inode *inode = &ci->vfs_inode;
1973
1974        if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1975                dout("writeback %p\n", inode);
1976                filemap_fdatawrite(&inode->i_data);
1977        }
1978        if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1979                ceph_do_invalidate_pages(inode);
1980
1981        if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1982                __ceph_do_pending_vmtruncate(inode);
1983
1984        if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
1985                ceph_check_caps(ci, 0, NULL);
1986
1987        if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
1988                ceph_flush_snaps(ci, NULL);
1989
1990        iput(inode);
1991}
1992
1993/*
1994 * symlinks
1995 */
1996static const struct inode_operations ceph_symlink_iops = {
1997        .get_link = simple_get_link,
1998        .setattr = ceph_setattr,
1999        .getattr = ceph_getattr,
2000        .listxattr = ceph_listxattr,
2001};
2002
2003int __ceph_setattr(struct inode *inode, struct iattr *attr)
2004{
2005        struct ceph_inode_info *ci = ceph_inode(inode);
2006        unsigned int ia_valid = attr->ia_valid;
2007        struct ceph_mds_request *req;
2008        struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2009        struct ceph_cap_flush *prealloc_cf;
2010        int issued;
2011        int release = 0, dirtied = 0;
2012        int mask = 0;
2013        int err = 0;
2014        int inode_dirty_flags = 0;
2015        bool lock_snap_rwsem = false;
2016
2017        prealloc_cf = ceph_alloc_cap_flush();
2018        if (!prealloc_cf)
2019                return -ENOMEM;
2020
2021        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2022                                       USE_AUTH_MDS);
2023        if (IS_ERR(req)) {
2024                ceph_free_cap_flush(prealloc_cf);
2025                return PTR_ERR(req);
2026        }
2027
2028        spin_lock(&ci->i_ceph_lock);
2029        issued = __ceph_caps_issued(ci, NULL);
2030
2031        if (!ci->i_head_snapc &&
2032            (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2033                lock_snap_rwsem = true;
2034                if (!down_read_trylock(&mdsc->snap_rwsem)) {
2035                        spin_unlock(&ci->i_ceph_lock);
2036                        down_read(&mdsc->snap_rwsem);
2037                        spin_lock(&ci->i_ceph_lock);
2038                        issued = __ceph_caps_issued(ci, NULL);
2039                }
2040        }
2041
2042        dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2043
2044        if (ia_valid & ATTR_UID) {
2045                dout("setattr %p uid %d -> %d\n", inode,
2046                     from_kuid(&init_user_ns, inode->i_uid),
2047                     from_kuid(&init_user_ns, attr->ia_uid));
2048                if (issued & CEPH_CAP_AUTH_EXCL) {
2049                        inode->i_uid = attr->ia_uid;
2050                        dirtied |= CEPH_CAP_AUTH_EXCL;
2051                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2052                           !uid_eq(attr->ia_uid, inode->i_uid)) {
2053                        req->r_args.setattr.uid = cpu_to_le32(
2054                                from_kuid(&init_user_ns, attr->ia_uid));
2055                        mask |= CEPH_SETATTR_UID;
2056                        release |= CEPH_CAP_AUTH_SHARED;
2057                }
2058        }
2059        if (ia_valid & ATTR_GID) {
2060                dout("setattr %p gid %d -> %d\n", inode,
2061                     from_kgid(&init_user_ns, inode->i_gid),
2062                     from_kgid(&init_user_ns, attr->ia_gid));
2063                if (issued & CEPH_CAP_AUTH_EXCL) {
2064                        inode->i_gid = attr->ia_gid;
2065                        dirtied |= CEPH_CAP_AUTH_EXCL;
2066                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2067                           !gid_eq(attr->ia_gid, inode->i_gid)) {
2068                        req->r_args.setattr.gid = cpu_to_le32(
2069                                from_kgid(&init_user_ns, attr->ia_gid));
2070                        mask |= CEPH_SETATTR_GID;
2071                        release |= CEPH_CAP_AUTH_SHARED;
2072                }
2073        }
2074        if (ia_valid & ATTR_MODE) {
2075                dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2076                     attr->ia_mode);
2077                if (issued & CEPH_CAP_AUTH_EXCL) {
2078                        inode->i_mode = attr->ia_mode;
2079                        dirtied |= CEPH_CAP_AUTH_EXCL;
2080                } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2081                           attr->ia_mode != inode->i_mode) {
2082                        inode->i_mode = attr->ia_mode;
2083                        req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2084                        mask |= CEPH_SETATTR_MODE;
2085                        release |= CEPH_CAP_AUTH_SHARED;
2086                }
2087        }
2088
2089        if (ia_valid & ATTR_ATIME) {
2090                dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2091                     inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2092                     attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2093                if (issued & CEPH_CAP_FILE_EXCL) {
2094                        ci->i_time_warp_seq++;
2095                        inode->i_atime = attr->ia_atime;
2096                        dirtied |= CEPH_CAP_FILE_EXCL;
2097                } else if ((issued & CEPH_CAP_FILE_WR) &&
2098                           timespec64_compare(&inode->i_atime,
2099                                            &attr->ia_atime) < 0) {
2100                        inode->i_atime = attr->ia_atime;
2101                        dirtied |= CEPH_CAP_FILE_WR;
2102                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2103                           !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2104                        ceph_encode_timespec64(&req->r_args.setattr.atime,
2105                                               &attr->ia_atime);
2106                        mask |= CEPH_SETATTR_ATIME;
2107                        release |= CEPH_CAP_FILE_SHARED |
2108                                   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2109                }
2110        }
2111        if (ia_valid & ATTR_SIZE) {
2112                loff_t isize = i_size_read(inode);
2113
2114                dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
2115                if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size > isize) {
2116                        i_size_write(inode, attr->ia_size);
2117                        inode->i_blocks = calc_inode_blocks(attr->ia_size);
2118                        ci->i_reported_size = attr->ia_size;
2119                        dirtied |= CEPH_CAP_FILE_EXCL;
2120                        ia_valid |= ATTR_MTIME;
2121                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2122                           attr->ia_size != isize) {
2123                        req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2124                        req->r_args.setattr.old_size = cpu_to_le64(isize);
2125                        mask |= CEPH_SETATTR_SIZE;
2126                        release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2127                                   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2128                }
2129        }
2130        if (ia_valid & ATTR_MTIME) {
2131                dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2132                     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2133                     attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2134                if (issued & CEPH_CAP_FILE_EXCL) {
2135                        ci->i_time_warp_seq++;
2136                        inode->i_mtime = attr->ia_mtime;
2137                        dirtied |= CEPH_CAP_FILE_EXCL;
2138                } else if ((issued & CEPH_CAP_FILE_WR) &&
2139                           timespec64_compare(&inode->i_mtime,
2140                                            &attr->ia_mtime) < 0) {
2141                        inode->i_mtime = attr->ia_mtime;
2142                        dirtied |= CEPH_CAP_FILE_WR;
2143                } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2144                           !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2145                        ceph_encode_timespec64(&req->r_args.setattr.mtime,
2146                                               &attr->ia_mtime);
2147                        mask |= CEPH_SETATTR_MTIME;
2148                        release |= CEPH_CAP_FILE_SHARED |
2149                                   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2150                }
2151        }
2152
2153        /* these do nothing */
2154        if (ia_valid & ATTR_CTIME) {
2155                bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2156                                         ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2157                dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2158                     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2159                     attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2160                     only ? "ctime only" : "ignored");
2161                if (only) {
2162                        /*
2163                         * if kernel wants to dirty ctime but nothing else,
2164                         * we need to choose a cap to dirty under, or do
2165                         * a almost-no-op setattr
2166                         */
2167                        if (issued & CEPH_CAP_AUTH_EXCL)
2168                                dirtied |= CEPH_CAP_AUTH_EXCL;
2169                        else if (issued & CEPH_CAP_FILE_EXCL)
2170                                dirtied |= CEPH_CAP_FILE_EXCL;
2171                        else if (issued & CEPH_CAP_XATTR_EXCL)
2172                                dirtied |= CEPH_CAP_XATTR_EXCL;
2173                        else
2174                                mask |= CEPH_SETATTR_CTIME;
2175                }
2176        }
2177        if (ia_valid & ATTR_FILE)
2178                dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2179
2180        if (dirtied) {
2181                inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2182                                                           &prealloc_cf);
2183                inode->i_ctime = attr->ia_ctime;
2184        }
2185
2186        release &= issued;
2187        spin_unlock(&ci->i_ceph_lock);
2188        if (lock_snap_rwsem)
2189                up_read(&mdsc->snap_rwsem);
2190
2191        if (inode_dirty_flags)
2192                __mark_inode_dirty(inode, inode_dirty_flags);
2193
2194
2195        if (mask) {
2196                req->r_inode = inode;
2197                ihold(inode);
2198                req->r_inode_drop = release;
2199                req->r_args.setattr.mask = cpu_to_le32(mask);
2200                req->r_num_caps = 1;
2201                req->r_stamp = attr->ia_ctime;
2202                err = ceph_mdsc_do_request(mdsc, NULL, req);
2203        }
2204        dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2205             ceph_cap_string(dirtied), mask);
2206
2207        ceph_mdsc_put_request(req);
2208        ceph_free_cap_flush(prealloc_cf);
2209
2210        if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2211                __ceph_do_pending_vmtruncate(inode);
2212
2213        return err;
2214}
2215
2216/*
2217 * setattr
2218 */
2219int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
2220                 struct iattr *attr)
2221{
2222        struct inode *inode = d_inode(dentry);
2223        struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2224        int err;
2225
2226        if (ceph_snap(inode) != CEPH_NOSNAP)
2227                return -EROFS;
2228
2229        err = setattr_prepare(&init_user_ns, dentry, attr);
2230        if (err != 0)
2231                return err;
2232
2233        if ((attr->ia_valid & ATTR_SIZE) &&
2234            attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2235                return -EFBIG;
2236
2237        if ((attr->ia_valid & ATTR_SIZE) &&
2238            ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2239                return -EDQUOT;
2240
2241        err = __ceph_setattr(inode, attr);
2242
2243        if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2244                err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode);
2245
2246        return err;
2247}
2248
2249/*
2250 * Verify that we have a lease on the given mask.  If not,
2251 * do a getattr against an mds.
2252 */
2253int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2254                      int mask, bool force)
2255{
2256        struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2257        struct ceph_mds_client *mdsc = fsc->mdsc;
2258        struct ceph_mds_request *req;
2259        int mode;
2260        int err;
2261
2262        if (ceph_snap(inode) == CEPH_SNAPDIR) {
2263                dout("do_getattr inode %p SNAPDIR\n", inode);
2264                return 0;
2265        }
2266
2267        dout("do_getattr inode %p mask %s mode 0%o\n",
2268             inode, ceph_cap_string(mask), inode->i_mode);
2269        if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2270                        return 0;
2271
2272        mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2273        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2274        if (IS_ERR(req))
2275                return PTR_ERR(req);
2276        req->r_inode = inode;
2277        ihold(inode);
2278        req->r_num_caps = 1;
2279        req->r_args.getattr.mask = cpu_to_le32(mask);
2280        req->r_locked_page = locked_page;
2281        err = ceph_mdsc_do_request(mdsc, NULL, req);
2282        if (locked_page && err == 0) {
2283                u64 inline_version = req->r_reply_info.targeti.inline_version;
2284                if (inline_version == 0) {
2285                        /* the reply is supposed to contain inline data */
2286                        err = -EINVAL;
2287                } else if (inline_version == CEPH_INLINE_NONE) {
2288                        err = -ENODATA;
2289                } else {
2290                        err = req->r_reply_info.targeti.inline_len;
2291                }
2292        }
2293        ceph_mdsc_put_request(req);
2294        dout("do_getattr result=%d\n", err);
2295        return err;
2296}
2297
2298
2299/*
2300 * Check inode permissions.  We verify we have a valid value for
2301 * the AUTH cap, then call the generic handler.
2302 */
2303int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
2304                    int mask)
2305{
2306        int err;
2307
2308        if (mask & MAY_NOT_BLOCK)
2309                return -ECHILD;
2310
2311        err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2312
2313        if (!err)
2314                err = generic_permission(&init_user_ns, inode, mask);
2315        return err;
2316}
2317
2318/* Craft a mask of needed caps given a set of requested statx attrs. */
2319static int statx_to_caps(u32 want, umode_t mode)
2320{
2321        int mask = 0;
2322
2323        if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2324                mask |= CEPH_CAP_AUTH_SHARED;
2325
2326        if (want & (STATX_NLINK|STATX_CTIME)) {
2327                /*
2328                 * The link count for directories depends on inode->i_subdirs,
2329                 * and that is only updated when Fs caps are held.
2330                 */
2331                if (S_ISDIR(mode))
2332                        mask |= CEPH_CAP_FILE_SHARED;
2333                else
2334                        mask |= CEPH_CAP_LINK_SHARED;
2335        }
2336
2337        if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2338                    STATX_BLOCKS))
2339                mask |= CEPH_CAP_FILE_SHARED;
2340
2341        if (want & (STATX_CTIME))
2342                mask |= CEPH_CAP_XATTR_SHARED;
2343
2344        return mask;
2345}
2346
2347/*
2348 * Get all the attributes. If we have sufficient caps for the requested attrs,
2349 * then we can avoid talking to the MDS at all.
2350 */
2351int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
2352                 struct kstat *stat, u32 request_mask, unsigned int flags)
2353{
2354        struct inode *inode = d_inode(path->dentry);
2355        struct ceph_inode_info *ci = ceph_inode(inode);
2356        u32 valid_mask = STATX_BASIC_STATS;
2357        int err = 0;
2358
2359        /* Skip the getattr altogether if we're asked not to sync */
2360        if (!(flags & AT_STATX_DONT_SYNC)) {
2361                err = ceph_do_getattr(inode,
2362                                statx_to_caps(request_mask, inode->i_mode),
2363                                flags & AT_STATX_FORCE_SYNC);
2364                if (err)
2365                        return err;
2366        }
2367
2368        generic_fillattr(&init_user_ns, inode, stat);
2369        stat->ino = ceph_present_inode(inode);
2370
2371        /*
2372         * btime on newly-allocated inodes is 0, so if this is still set to
2373         * that, then assume that it's not valid.
2374         */
2375        if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2376                stat->btime = ci->i_btime;
2377                valid_mask |= STATX_BTIME;
2378        }
2379
2380        if (ceph_snap(inode) == CEPH_NOSNAP)
2381                stat->dev = inode->i_sb->s_dev;
2382        else
2383                stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2384
2385        if (S_ISDIR(inode->i_mode)) {
2386                if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2387                                        RBYTES))
2388                        stat->size = ci->i_rbytes;
2389                else
2390                        stat->size = ci->i_files + ci->i_subdirs;
2391                stat->blocks = 0;
2392                stat->blksize = 65536;
2393                /*
2394                 * Some applications rely on the number of st_nlink
2395                 * value on directories to be either 0 (if unlinked)
2396                 * or 2 + number of subdirectories.
2397                 */
2398                if (stat->nlink == 1)
2399                        /* '.' + '..' + subdirs */
2400                        stat->nlink = 1 + 1 + ci->i_subdirs;
2401        }
2402
2403        stat->result_mask = request_mask & valid_mask;
2404        return err;
2405}
2406