fs/ceph/inode.c

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

DEFINITIONS
