1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/ceph/ceph_debug.h>
   3
   4#include <linux/module.h>
   5#include <linux/fs.h>
   6#include <linux/slab.h>
   7#include <linux/string.h>
   8#include <linux/uaccess.h>
   9#include <linux/kernel.h>
  10#include <linux/writeback.h>
  11#include <linux/vmalloc.h>
  12#include <linux/xattr.h>
  13#include <linux/posix_acl.h>
  14#include <linux/random.h>
  15#include <linux/sort.h>
  16#include <linux/iversion.h>
  17
  18#include "super.h"
  19#include "mds_client.h"
  20#include "cache.h"
  21#include <linux/ceph/decode.h>
  22
  23/*
  24 * Ceph inode operations
  25 *
  26 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  27 * setattr, etc.), xattr helpers, and helpers for assimilating
  28 * metadata returned by the MDS into our cache.
  29 *
  30 * Also define helpers for doing asynchronous writeback, invalidation,
  31 * and truncation for the benefit of those who can't afford to block
  32 * (typically because they are in the message handler path).
  33 */
  34
  35static const struct inode_operations ceph_symlink_iops;
  36
  37static void ceph_inode_work(struct work_struct *work);
 
 
  38
  39/*
  40 * find or create an inode, given the ceph ino number
  41 */
  42static int ceph_set_ino_cb(struct inode *inode, void *data)
  43{
  44	struct ceph_inode_info *ci = ceph_inode(inode);
  45
  46	ci->i_vino = *(struct ceph_vino *)data;
  47	inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
  48	inode_set_iversion_raw(inode, 0);
  49	return 0;
  50}
  51
  52struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  53{
  54	struct inode *inode;
 
  55
  56	inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
  57			     ceph_set_ino_cb, &vino);
  58	if (!inode)
  59		return ERR_PTR(-ENOMEM);
 
 
 
 
 
  60
  61	dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
  62	     ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
  63	return inode;
  64}
  65
  66/*
  67 * get/constuct snapdir inode for a given directory
  68 */
  69struct inode *ceph_get_snapdir(struct inode *parent)
  70{
  71	struct ceph_vino vino = {
  72		.ino = ceph_ino(parent),
  73		.snap = CEPH_SNAPDIR,
  74	};
  75	struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  76	struct ceph_inode_info *ci = ceph_inode(inode);
  77
  78	BUG_ON(!S_ISDIR(parent->i_mode));
  79	if (IS_ERR(inode))
  80		return inode;
  81	inode->i_mode = parent->i_mode;
  82	inode->i_uid = parent->i_uid;
  83	inode->i_gid = parent->i_gid;
  84	inode->i_mtime = parent->i_mtime;
  85	inode->i_ctime = parent->i_ctime;
  86	inode->i_atime = parent->i_atime;
  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	ci->i_btime = ceph_inode(parent)->i_btime;
  92
  93	if (inode->i_state & I_NEW)
  94		unlock_new_inode(inode);
  95
  96	return inode;
  97}
  98
  99const struct inode_operations ceph_file_iops = {
 100	.permission = ceph_permission,
 101	.setattr = ceph_setattr,
 102	.getattr = ceph_getattr,
 103	.listxattr = ceph_listxattr,
 104	.get_acl = ceph_get_acl,
 105	.set_acl = ceph_set_acl,
 106};
 107
 108
 109/*
 110 * We use a 'frag tree' to keep track of the MDS's directory fragments
 111 * for a given inode (usually there is just a single fragment).  We
 112 * need to know when a child frag is delegated to a new MDS, or when
 113 * it is flagged as replicated, so we can direct our requests
 114 * accordingly.
 115 */
 116
 117/*
 118 * find/create a frag in the tree
 119 */
 120static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 121						    u32 f)
 122{
 123	struct rb_node **p;
 124	struct rb_node *parent = NULL;
 125	struct ceph_inode_frag *frag;
 126	int c;
 127
 128	p = &ci->i_fragtree.rb_node;
 129	while (*p) {
 130		parent = *p;
 131		frag = rb_entry(parent, struct ceph_inode_frag, node);
 132		c = ceph_frag_compare(f, frag->frag);
 133		if (c < 0)
 134			p = &(*p)->rb_left;
 135		else if (c > 0)
 136			p = &(*p)->rb_right;
 137		else
 138			return frag;
 139	}
 140
 141	frag = kmalloc(sizeof(*frag), GFP_NOFS);
 142	if (!frag)
 143		return ERR_PTR(-ENOMEM);
 144
 145	frag->frag = f;
 146	frag->split_by = 0;
 147	frag->mds = -1;
 148	frag->ndist = 0;
 149
 150	rb_link_node(&frag->node, parent, p);
 151	rb_insert_color(&frag->node, &ci->i_fragtree);
 152
 153	dout("get_or_create_frag added %llx.%llx frag %x\n",
 154	     ceph_vinop(&ci->vfs_inode), f);
 155	return frag;
 156}
 157
 158/*
 159 * find a specific frag @f
 160 */
 161struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 162{
 163	struct rb_node *n = ci->i_fragtree.rb_node;
 164
 165	while (n) {
 166		struct ceph_inode_frag *frag =
 167			rb_entry(n, struct ceph_inode_frag, node);
 168		int c = ceph_frag_compare(f, frag->frag);
 169		if (c < 0)
 170			n = n->rb_left;
 171		else if (c > 0)
 172			n = n->rb_right;
 173		else
 174			return frag;
 175	}
 176	return NULL;
 177}
 178
 179/*
 180 * Choose frag containing the given value @v.  If @pfrag is
 181 * specified, copy the frag delegation info to the caller if
 182 * it is present.
 183 */
 184static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 185			      struct ceph_inode_frag *pfrag, int *found)
 186{
 187	u32 t = ceph_frag_make(0, 0);
 188	struct ceph_inode_frag *frag;
 189	unsigned nway, i;
 190	u32 n;
 191
 192	if (found)
 193		*found = 0;
 194
 195	while (1) {
 196		WARN_ON(!ceph_frag_contains_value(t, v));
 197		frag = __ceph_find_frag(ci, t);
 198		if (!frag)
 199			break; /* t is a leaf */
 200		if (frag->split_by == 0) {
 201			if (pfrag)
 202				memcpy(pfrag, frag, sizeof(*pfrag));
 203			if (found)
 204				*found = 1;
 205			break;
 206		}
 207
 208		/* choose child */
 209		nway = 1 << frag->split_by;
 210		dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 211		     frag->split_by, nway);
 212		for (i = 0; i < nway; i++) {
 213			n = ceph_frag_make_child(t, frag->split_by, i);
 214			if (ceph_frag_contains_value(n, v)) {
 215				t = n;
 216				break;
 217			}
 218		}
 219		BUG_ON(i == nway);
 220	}
 221	dout("choose_frag(%x) = %x\n", v, t);
 222
 223	return t;
 224}
 225
 226u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 227		     struct ceph_inode_frag *pfrag, int *found)
 228{
 229	u32 ret;
 230	mutex_lock(&ci->i_fragtree_mutex);
 231	ret = __ceph_choose_frag(ci, v, pfrag, found);
 232	mutex_unlock(&ci->i_fragtree_mutex);
 233	return ret;
 234}
 235
 236/*
 237 * Process dirfrag (delegation) info from the mds.  Include leaf
 238 * fragment in tree ONLY if ndist > 0.  Otherwise, only
 239 * branches/splits are included in i_fragtree)
 240 */
 241static int ceph_fill_dirfrag(struct inode *inode,
 242			     struct ceph_mds_reply_dirfrag *dirinfo)
 243{
 244	struct ceph_inode_info *ci = ceph_inode(inode);
 245	struct ceph_inode_frag *frag;
 246	u32 id = le32_to_cpu(dirinfo->frag);
 247	int mds = le32_to_cpu(dirinfo->auth);
 248	int ndist = le32_to_cpu(dirinfo->ndist);
 249	int diri_auth = -1;
 250	int i;
 251	int err = 0;
 252
 253	spin_lock(&ci->i_ceph_lock);
 254	if (ci->i_auth_cap)
 255		diri_auth = ci->i_auth_cap->mds;
 256	spin_unlock(&ci->i_ceph_lock);
 257
 258	if (mds == -1) /* CDIR_AUTH_PARENT */
 259		mds = diri_auth;
 260
 261	mutex_lock(&ci->i_fragtree_mutex);
 262	if (ndist == 0 && mds == diri_auth) {
 263		/* no delegation info needed. */
 264		frag = __ceph_find_frag(ci, id);
 265		if (!frag)
 266			goto out;
 267		if (frag->split_by == 0) {
 268			/* tree leaf, remove */
 269			dout("fill_dirfrag removed %llx.%llx frag %x"
 270			     " (no ref)\n", ceph_vinop(inode), id);
 271			rb_erase(&frag->node, &ci->i_fragtree);
 272			kfree(frag);
 273		} else {
 274			/* tree branch, keep and clear */
 275			dout("fill_dirfrag cleared %llx.%llx frag %x"
 276			     " referral\n", ceph_vinop(inode), id);
 277			frag->mds = -1;
 278			frag->ndist = 0;
 279		}
 280		goto out;
 281	}
 282
 283
 284	/* find/add this frag to store mds delegation info */
 285	frag = __get_or_create_frag(ci, id);
 286	if (IS_ERR(frag)) {
 287		/* this is not the end of the world; we can continue
 288		   with bad/inaccurate delegation info */
 289		pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 290		       ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 291		err = -ENOMEM;
 292		goto out;
 293	}
 294
 295	frag->mds = mds;
 296	frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 297	for (i = 0; i < frag->ndist; i++)
 298		frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 299	dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 300	     ceph_vinop(inode), frag->frag, frag->ndist);
 301
 302out:
 303	mutex_unlock(&ci->i_fragtree_mutex);
 304	return err;
 305}
 306
 307static int frag_tree_split_cmp(const void *l, const void *r)
 308{
 309	struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 310	struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 311	return ceph_frag_compare(le32_to_cpu(ls->frag),
 312				 le32_to_cpu(rs->frag));
 313}
 314
 315static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 316{
 317	if (!frag)
 318		return f == ceph_frag_make(0, 0);
 319	if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 320		return false;
 321	return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 322}
 323
 324static int ceph_fill_fragtree(struct inode *inode,
 325			      struct ceph_frag_tree_head *fragtree,
 326			      struct ceph_mds_reply_dirfrag *dirinfo)
 327{
 328	struct ceph_inode_info *ci = ceph_inode(inode);
 329	struct ceph_inode_frag *frag, *prev_frag = NULL;
 330	struct rb_node *rb_node;
 331	unsigned i, split_by, nsplits;
 332	u32 id;
 333	bool update = false;
 334
 335	mutex_lock(&ci->i_fragtree_mutex);
 336	nsplits = le32_to_cpu(fragtree->nsplits);
 337	if (nsplits != ci->i_fragtree_nsplits) {
 338		update = true;
 339	} else if (nsplits) {
 340		i = prandom_u32() % nsplits;
 341		id = le32_to_cpu(fragtree->splits[i].frag);
 342		if (!__ceph_find_frag(ci, id))
 343			update = true;
 344	} else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 345		rb_node = rb_first(&ci->i_fragtree);
 346		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 347		if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 348			update = true;
 349	}
 350	if (!update && dirinfo) {
 351		id = le32_to_cpu(dirinfo->frag);
 352		if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 353			update = true;
 354	}
 355	if (!update)
 356		goto out_unlock;
 357
 358	if (nsplits > 1) {
 359		sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 360		     frag_tree_split_cmp, NULL);
 361	}
 362
 363	dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 364	rb_node = rb_first(&ci->i_fragtree);
 365	for (i = 0; i < nsplits; i++) {
 366		id = le32_to_cpu(fragtree->splits[i].frag);
 367		split_by = le32_to_cpu(fragtree->splits[i].by);
 368		if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 369			pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 370			       "frag %x split by %d\n", ceph_vinop(inode),
 371			       i, nsplits, id, split_by);
 372			continue;
 373		}
 374		frag = NULL;
 375		while (rb_node) {
 376			frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 377			if (ceph_frag_compare(frag->frag, id) >= 0) {
 378				if (frag->frag != id)
 379					frag = NULL;
 380				else
 381					rb_node = rb_next(rb_node);
 382				break;
 383			}
 384			rb_node = rb_next(rb_node);
 385			/* delete stale split/leaf node */
 386			if (frag->split_by > 0 ||
 387			    !is_frag_child(frag->frag, prev_frag)) {
 388				rb_erase(&frag->node, &ci->i_fragtree);
 389				if (frag->split_by > 0)
 390					ci->i_fragtree_nsplits--;
 391				kfree(frag);
 392			}
 393			frag = NULL;
 394		}
 395		if (!frag) {
 396			frag = __get_or_create_frag(ci, id);
 397			if (IS_ERR(frag))
 398				continue;
 399		}
 400		if (frag->split_by == 0)
 401			ci->i_fragtree_nsplits++;
 402		frag->split_by = split_by;
 403		dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 404		prev_frag = frag;
 405	}
 406	while (rb_node) {
 407		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 408		rb_node = rb_next(rb_node);
 409		/* delete stale split/leaf node */
 410		if (frag->split_by > 0 ||
 411		    !is_frag_child(frag->frag, prev_frag)) {
 412			rb_erase(&frag->node, &ci->i_fragtree);
 413			if (frag->split_by > 0)
 414				ci->i_fragtree_nsplits--;
 415			kfree(frag);
 416		}
 417	}
 418out_unlock:
 419	mutex_unlock(&ci->i_fragtree_mutex);
 420	return 0;
 421}
 422
 423/*
 424 * initialize a newly allocated inode.
 425 */
 426struct inode *ceph_alloc_inode(struct super_block *sb)
 427{
 428	struct ceph_inode_info *ci;
 429	int i;
 430
 431	ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 432	if (!ci)
 433		return NULL;
 434
 435	dout("alloc_inode %p\n", &ci->vfs_inode);
 436
 437	spin_lock_init(&ci->i_ceph_lock);
 438
 439	ci->i_version = 0;
 440	ci->i_inline_version = 0;
 441	ci->i_time_warp_seq = 0;
 442	ci->i_ceph_flags = 0;
 443	atomic64_set(&ci->i_ordered_count, 1);
 444	atomic64_set(&ci->i_release_count, 1);
 445	atomic64_set(&ci->i_complete_seq[0], 0);
 446	atomic64_set(&ci->i_complete_seq[1], 0);
 447	ci->i_symlink = NULL;
 448
 449	ci->i_max_bytes = 0;
 450	ci->i_max_files = 0;
 451
 452	memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 453	memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 454	RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 455
 456	ci->i_fragtree = RB_ROOT;
 457	mutex_init(&ci->i_fragtree_mutex);
 458
 459	ci->i_xattrs.blob = NULL;
 460	ci->i_xattrs.prealloc_blob = NULL;
 461	ci->i_xattrs.dirty = false;
 462	ci->i_xattrs.index = RB_ROOT;
 463	ci->i_xattrs.count = 0;
 464	ci->i_xattrs.names_size = 0;
 465	ci->i_xattrs.vals_size = 0;
 466	ci->i_xattrs.version = 0;
 467	ci->i_xattrs.index_version = 0;
 468
 469	ci->i_caps = RB_ROOT;
 470	ci->i_auth_cap = NULL;
 471	ci->i_dirty_caps = 0;
 472	ci->i_flushing_caps = 0;
 473	INIT_LIST_HEAD(&ci->i_dirty_item);
 474	INIT_LIST_HEAD(&ci->i_flushing_item);
 475	ci->i_prealloc_cap_flush = NULL;
 476	INIT_LIST_HEAD(&ci->i_cap_flush_list);
 477	init_waitqueue_head(&ci->i_cap_wq);
 
 478	ci->i_hold_caps_max = 0;
 479	INIT_LIST_HEAD(&ci->i_cap_delay_list);
 480	INIT_LIST_HEAD(&ci->i_cap_snaps);
 481	ci->i_head_snapc = NULL;
 482	ci->i_snap_caps = 0;
 483
 484	ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 485	for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 486		ci->i_nr_by_mode[i] = 0;
 487
 488	mutex_init(&ci->i_truncate_mutex);
 489	ci->i_truncate_seq = 0;
 490	ci->i_truncate_size = 0;
 491	ci->i_truncate_pending = 0;
 492
 493	ci->i_max_size = 0;
 494	ci->i_reported_size = 0;
 495	ci->i_wanted_max_size = 0;
 496	ci->i_requested_max_size = 0;
 497
 498	ci->i_pin_ref = 0;
 499	ci->i_rd_ref = 0;
 500	ci->i_rdcache_ref = 0;
 501	ci->i_wr_ref = 0;
 502	ci->i_wb_ref = 0;
 503	ci->i_fx_ref = 0;
 504	ci->i_wrbuffer_ref = 0;
 505	ci->i_wrbuffer_ref_head = 0;
 506	atomic_set(&ci->i_filelock_ref, 0);
 507	atomic_set(&ci->i_shared_gen, 1);
 508	ci->i_rdcache_gen = 0;
 509	ci->i_rdcache_revoking = 0;
 510
 511	INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 512	INIT_LIST_HEAD(&ci->i_unsafe_iops);
 513	spin_lock_init(&ci->i_unsafe_lock);
 514
 515	ci->i_snap_realm = NULL;
 516	INIT_LIST_HEAD(&ci->i_snap_realm_item);
 517	INIT_LIST_HEAD(&ci->i_snap_flush_item);
 518
 519	INIT_WORK(&ci->i_work, ceph_inode_work);
 520	ci->i_work_mask = 0;
 521	memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 522
 523	ceph_fscache_inode_init(ci);
 524
 525	ci->i_meta_err = 0;
 526
 527	return &ci->vfs_inode;
 528}
 529
 530void ceph_free_inode(struct inode *inode)
 531{
 
 532	struct ceph_inode_info *ci = ceph_inode(inode);
 533
 534	kfree(ci->i_symlink);
 535	kmem_cache_free(ceph_inode_cachep, ci);
 536}
 537
 538void ceph_evict_inode(struct inode *inode)
 539{
 540	struct ceph_inode_info *ci = ceph_inode(inode);
 541	struct ceph_inode_frag *frag;
 542	struct rb_node *n;
 543
 544	dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 545
 546	truncate_inode_pages_final(&inode->i_data);
 547	clear_inode(inode);
 548
 549	ceph_fscache_unregister_inode_cookie(ci);
 550
 551	__ceph_remove_caps(ci);
 552
 553	if (__ceph_has_any_quota(ci))
 554		ceph_adjust_quota_realms_count(inode, false);
 555
 556	/*
 557	 * we may still have a snap_realm reference if there are stray
 558	 * caps in i_snap_caps.
 559	 */
 560	if (ci->i_snap_realm) {
 561		struct ceph_mds_client *mdsc =
 562					ceph_inode_to_client(inode)->mdsc;
 563		if (ceph_snap(inode) == CEPH_NOSNAP) {
 564			struct ceph_snap_realm *realm = ci->i_snap_realm;
 565			dout(" dropping residual ref to snap realm %p\n",
 566			     realm);
 567			spin_lock(&realm->inodes_with_caps_lock);
 568			list_del_init(&ci->i_snap_realm_item);
 569			ci->i_snap_realm = NULL;
 570			if (realm->ino == ci->i_vino.ino)
 571				realm->inode = NULL;
 572			spin_unlock(&realm->inodes_with_caps_lock);
 573			ceph_put_snap_realm(mdsc, realm);
 574		} else {
 575			ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 576			ci->i_snap_realm = NULL;
 577		}
 578	}
 579
 
 580	while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 581		frag = rb_entry(n, struct ceph_inode_frag, node);
 582		rb_erase(n, &ci->i_fragtree);
 583		kfree(frag);
 584	}
 585	ci->i_fragtree_nsplits = 0;
 586
 587	__ceph_destroy_xattrs(ci);
 588	if (ci->i_xattrs.blob)
 589		ceph_buffer_put(ci->i_xattrs.blob);
 590	if (ci->i_xattrs.prealloc_blob)
 591		ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 592
 593	ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 594	ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 
 
 
 
 
 
 
 
 
 
 
 595}
 596
 597static inline blkcnt_t calc_inode_blocks(u64 size)
 598{
 599	return (size + (1<<9) - 1) >> 9;
 600}
 601
 602/*
 603 * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 604 * careful because either the client or MDS may have more up to date
 605 * info, depending on which capabilities are held, and whether
 606 * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 607 * and size are monotonically increasing, except when utimes() or
 608 * truncate() increments the corresponding _seq values.)
 609 */
 610int ceph_fill_file_size(struct inode *inode, int issued,
 611			u32 truncate_seq, u64 truncate_size, u64 size)
 612{
 613	struct ceph_inode_info *ci = ceph_inode(inode);
 614	int queue_trunc = 0;
 615
 616	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 617	    (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 618		dout("size %lld -> %llu\n", inode->i_size, size);
 619		if (size > 0 && S_ISDIR(inode->i_mode)) {
 620			pr_err("fill_file_size non-zero size for directory\n");
 621			size = 0;
 622		}
 623		i_size_write(inode, size);
 624		inode->i_blocks = calc_inode_blocks(size);
 625		ci->i_reported_size = size;
 626		if (truncate_seq != ci->i_truncate_seq) {
 627			dout("truncate_seq %u -> %u\n",
 628			     ci->i_truncate_seq, truncate_seq);
 629			ci->i_truncate_seq = truncate_seq;
 630
 631			/* the MDS should have revoked these caps */
 632			WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 633					       CEPH_CAP_FILE_RD |
 634					       CEPH_CAP_FILE_WR |
 635					       CEPH_CAP_FILE_LAZYIO));
 636			/*
 637			 * If we hold relevant caps, or in the case where we're
 638			 * not the only client referencing this file and we
 639			 * don't hold those caps, then we need to check whether
 640			 * the file is either opened or mmaped
 641			 */
 642			if ((issued & (CEPH_CAP_FILE_CACHE|
 643				       CEPH_CAP_FILE_BUFFER)) ||
 644			    mapping_mapped(inode->i_mapping) ||
 645			    __ceph_is_file_opened(ci)) {
 646				ci->i_truncate_pending++;
 647				queue_trunc = 1;
 648			}
 649		}
 650	}
 651	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 652	    ci->i_truncate_size != truncate_size) {
 653		dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 654		     truncate_size);
 655		ci->i_truncate_size = truncate_size;
 656	}
 657
 658	if (queue_trunc)
 659		ceph_fscache_invalidate(inode);
 660
 661	return queue_trunc;
 662}
 663
 664void ceph_fill_file_time(struct inode *inode, int issued,
 665			 u64 time_warp_seq, struct timespec64 *ctime,
 666			 struct timespec64 *mtime, struct timespec64 *atime)
 667{
 668	struct ceph_inode_info *ci = ceph_inode(inode);
 669	int warn = 0;
 670
 671	if (issued & (CEPH_CAP_FILE_EXCL|
 672		      CEPH_CAP_FILE_WR|
 673		      CEPH_CAP_FILE_BUFFER|
 674		      CEPH_CAP_AUTH_EXCL|
 675		      CEPH_CAP_XATTR_EXCL)) {
 676		if (ci->i_version == 0 ||
 677		    timespec64_compare(ctime, &inode->i_ctime) > 0) {
 678			dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 679			     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 680			     ctime->tv_sec, ctime->tv_nsec);
 681			inode->i_ctime = *ctime;
 682		}
 683		if (ci->i_version == 0 ||
 684		    ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 685			/* the MDS did a utimes() */
 686			dout("mtime %lld.%09ld -> %lld.%09ld "
 687			     "tw %d -> %d\n",
 688			     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 689			     mtime->tv_sec, mtime->tv_nsec,
 690			     ci->i_time_warp_seq, (int)time_warp_seq);
 691
 692			inode->i_mtime = *mtime;
 693			inode->i_atime = *atime;
 694			ci->i_time_warp_seq = time_warp_seq;
 695		} else if (time_warp_seq == ci->i_time_warp_seq) {
 696			/* nobody did utimes(); take the max */
 697			if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 698				dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 699				     inode->i_mtime.tv_sec,
 700				     inode->i_mtime.tv_nsec,
 701				     mtime->tv_sec, mtime->tv_nsec);
 702				inode->i_mtime = *mtime;
 703			}
 704			if (timespec64_compare(atime, &inode->i_atime) > 0) {
 705				dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 706				     inode->i_atime.tv_sec,
 707				     inode->i_atime.tv_nsec,
 708				     atime->tv_sec, atime->tv_nsec);
 709				inode->i_atime = *atime;
 710			}
 711		} else if (issued & CEPH_CAP_FILE_EXCL) {
 712			/* we did a utimes(); ignore mds values */
 713		} else {
 714			warn = 1;
 715		}
 716	} else {
 717		/* we have no write|excl caps; whatever the MDS says is true */
 718		if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 719			inode->i_ctime = *ctime;
 720			inode->i_mtime = *mtime;
 721			inode->i_atime = *atime;
 722			ci->i_time_warp_seq = time_warp_seq;
 723		} else {
 724			warn = 1;
 725		}
 726	}
 727	if (warn) /* time_warp_seq shouldn't go backwards */
 728		dout("%p mds time_warp_seq %llu < %u\n",
 729		     inode, time_warp_seq, ci->i_time_warp_seq);
 730}
 731
 732/*
 733 * Populate an inode based on info from mds.  May be called on new or
 734 * existing inodes.
 735 */
 736int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 737		    struct ceph_mds_reply_info_in *iinfo,
 738		    struct ceph_mds_reply_dirfrag *dirinfo,
 739		    struct ceph_mds_session *session, int cap_fmode,
 740		    struct ceph_cap_reservation *caps_reservation)
 
 741{
 742	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 743	struct ceph_mds_reply_inode *info = iinfo->in;
 744	struct ceph_inode_info *ci = ceph_inode(inode);
 745	int issued, new_issued, info_caps;
 746	struct timespec64 mtime, atime, ctime;
 747	struct ceph_buffer *xattr_blob = NULL;
 748	struct ceph_buffer *old_blob = NULL;
 749	struct ceph_string *pool_ns = NULL;
 750	struct ceph_cap *new_cap = NULL;
 751	int err = 0;
 752	bool wake = false;
 753	bool queue_trunc = false;
 754	bool new_version = false;
 755	bool fill_inline = false;
 756
 757	dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
 758	     inode, ceph_vinop(inode), le64_to_cpu(info->version),
 759	     ci->i_version);
 760
 761	info_caps = le32_to_cpu(info->cap.caps);
 762
 763	/* prealloc new cap struct */
 764	if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 765		new_cap = ceph_get_cap(mdsc, caps_reservation);
 766		if (!new_cap)
 767			return -ENOMEM;
 768	}
 769
 770	/*
 771	 * prealloc xattr data, if it looks like we'll need it.  only
 772	 * if len > 4 (meaning there are actually xattrs; the first 4
 773	 * bytes are the xattr count).
 774	 */
 775	if (iinfo->xattr_len > 4) {
 776		xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 777		if (!xattr_blob)
 778			pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
 779			       iinfo->xattr_len);
 780	}
 781
 782	if (iinfo->pool_ns_len > 0)
 783		pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 784						     iinfo->pool_ns_len);
 785
 786	if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 787		ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 788
 789	spin_lock(&ci->i_ceph_lock);
 790
 791	/*
 792	 * provided version will be odd if inode value is projected,
 793	 * even if stable.  skip the update if we have newer stable
 794	 * info (ours>=theirs, e.g. due to racing mds replies), unless
 795	 * we are getting projected (unstable) info (in which case the
 796	 * version is odd, and we want ours>theirs).
 797	 *   us   them
 798	 *   2    2     skip
 799	 *   3    2     skip
 800	 *   3    3     update
 801	 */
 802	if (ci->i_version == 0 ||
 803	    ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 804	     le64_to_cpu(info->version) > (ci->i_version & ~1)))
 805		new_version = true;
 806
 807	/* Update change_attribute */
 808	inode_set_max_iversion_raw(inode, iinfo->change_attr);
 809
 810	__ceph_caps_issued(ci, &issued);
 811	issued |= __ceph_caps_dirty(ci);
 812	new_issued = ~issued & info_caps;
 813
 814	/* update inode */
 815	inode->i_rdev = le32_to_cpu(info->rdev);
 816	/* directories have fl_stripe_unit set to zero */
 817	if (le32_to_cpu(info->layout.fl_stripe_unit))
 818		inode->i_blkbits =
 819			fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 820	else
 821		inode->i_blkbits = CEPH_BLOCK_SHIFT;
 822
 823	__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 824
 825	if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 826	    (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 827		inode->i_mode = le32_to_cpu(info->mode);
 828		inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 829		inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 830		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 831		     from_kuid(&init_user_ns, inode->i_uid),
 832		     from_kgid(&init_user_ns, inode->i_gid));
 833		ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
 834		ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 835	}
 836
 837	if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 838	    (issued & CEPH_CAP_LINK_EXCL) == 0)
 839		set_nlink(inode, le32_to_cpu(info->nlink));
 840
 841	if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 842		/* be careful with mtime, atime, size */
 843		ceph_decode_timespec64(&atime, &info->atime);
 844		ceph_decode_timespec64(&mtime, &info->mtime);
 845		ceph_decode_timespec64(&ctime, &info->ctime);
 846		ceph_fill_file_time(inode, issued,
 847				le32_to_cpu(info->time_warp_seq),
 848				&ctime, &mtime, &atime);
 849	}
 850
 851	if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 852		ci->i_files = le64_to_cpu(info->files);
 853		ci->i_subdirs = le64_to_cpu(info->subdirs);
 854	}
 855
 856	if (new_version ||
 857	    (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 858		s64 old_pool = ci->i_layout.pool_id;
 859		struct ceph_string *old_ns;
 860
 861		ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 862		old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 863					lockdep_is_held(&ci->i_ceph_lock));
 864		rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 865
 866		if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 867			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 868
 869		pool_ns = old_ns;
 870
 871		queue_trunc = ceph_fill_file_size(inode, issued,
 872					le32_to_cpu(info->truncate_seq),
 873					le64_to_cpu(info->truncate_size),
 874					le64_to_cpu(info->size));
 875		/* only update max_size on auth cap */
 876		if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 877		    ci->i_max_size != le64_to_cpu(info->max_size)) {
 878			dout("max_size %lld -> %llu\n", ci->i_max_size,
 879					le64_to_cpu(info->max_size));
 880			ci->i_max_size = le64_to_cpu(info->max_size);
 881		}
 882	}
 883
 884	/* layout and rstat are not tracked by capability, update them if
 885	 * the inode info is from auth mds */
 886	if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 887		if (S_ISDIR(inode->i_mode)) {
 888			ci->i_dir_layout = iinfo->dir_layout;
 889			ci->i_rbytes = le64_to_cpu(info->rbytes);
 890			ci->i_rfiles = le64_to_cpu(info->rfiles);
 891			ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 892			ci->i_dir_pin = iinfo->dir_pin;
 893			ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 894		}
 895	}
 896
 897	/* xattrs */
 898	/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 899	if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 900	    le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 901		if (ci->i_xattrs.blob)
 902			old_blob = ci->i_xattrs.blob;
 903		ci->i_xattrs.blob = xattr_blob;
 904		if (xattr_blob)
 905			memcpy(ci->i_xattrs.blob->vec.iov_base,
 906			       iinfo->xattr_data, iinfo->xattr_len);
 907		ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 908		ceph_forget_all_cached_acls(inode);
 909		ceph_security_invalidate_secctx(inode);
 910		xattr_blob = NULL;
 911	}
 912
 913	/* finally update i_version */
 914	if (le64_to_cpu(info->version) > ci->i_version)
 915		ci->i_version = le64_to_cpu(info->version);
 916
 917	inode->i_mapping->a_ops = &ceph_aops;
 918
 919	switch (inode->i_mode & S_IFMT) {
 920	case S_IFIFO:
 921	case S_IFBLK:
 922	case S_IFCHR:
 923	case S_IFSOCK:
 924		inode->i_blkbits = PAGE_SHIFT;
 925		init_special_inode(inode, inode->i_mode, inode->i_rdev);
 926		inode->i_op = &ceph_file_iops;
 927		break;
 928	case S_IFREG:
 929		inode->i_op = &ceph_file_iops;
 930		inode->i_fop = &ceph_file_fops;
 931		break;
 932	case S_IFLNK:
 933		inode->i_op = &ceph_symlink_iops;
 934		if (!ci->i_symlink) {
 935			u32 symlen = iinfo->symlink_len;
 936			char *sym;
 937
 938			spin_unlock(&ci->i_ceph_lock);
 939
 940			if (symlen != i_size_read(inode)) {
 941				pr_err("%s %llx.%llx BAD symlink "
 942					"size %lld\n", __func__,
 943					ceph_vinop(inode),
 944					i_size_read(inode));
 945				i_size_write(inode, symlen);
 946				inode->i_blocks = calc_inode_blocks(symlen);
 947			}
 948
 949			err = -ENOMEM;
 950			sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 951			if (!sym)
 952				goto out;
 953
 954			spin_lock(&ci->i_ceph_lock);
 955			if (!ci->i_symlink)
 956				ci->i_symlink = sym;
 957			else
 958				kfree(sym); /* lost a race */
 959		}
 960		inode->i_link = ci->i_symlink;
 961		break;
 962	case S_IFDIR:
 963		inode->i_op = &ceph_dir_iops;
 964		inode->i_fop = &ceph_dir_fops;
 
 
 
 
 
 
 
 
 
 965		break;
 966	default:
 967		pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
 968		       ceph_vinop(inode), inode->i_mode);
 969	}
 970
 971	/* were we issued a capability? */
 972	if (info_caps) {
 973		if (ceph_snap(inode) == CEPH_NOSNAP) {
 
 974			ceph_add_cap(inode, session,
 975				     le64_to_cpu(info->cap.cap_id),
 976				     info_caps,
 977				     le32_to_cpu(info->cap.wanted),
 978				     le32_to_cpu(info->cap.seq),
 979				     le32_to_cpu(info->cap.mseq),
 980				     le64_to_cpu(info->cap.realm),
 981				     info->cap.flags, &new_cap);
 982
 983			/* set dir completion flag? */
 984			if (S_ISDIR(inode->i_mode) &&
 985			    ci->i_files == 0 && ci->i_subdirs == 0 &&
 986			    (info_caps & CEPH_CAP_FILE_SHARED) &&
 987			    (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 988			    !__ceph_dir_is_complete(ci)) {
 989				dout(" marking %p complete (empty)\n", inode);
 990				i_size_write(inode, 0);
 991				__ceph_dir_set_complete(ci,
 992					atomic64_read(&ci->i_release_count),
 993					atomic64_read(&ci->i_ordered_count));
 994			}
 995
 996			wake = true;
 997		} else {
 998			dout(" %p got snap_caps %s\n", inode,
 999			     ceph_cap_string(info_caps));
1000			ci->i_snap_caps |= info_caps;
1001		}
 
 
 
 
 
 
1002	}
1003
1004	if (iinfo->inline_version > 0 &&
1005	    iinfo->inline_version >= ci->i_inline_version) {
1006		int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1007		ci->i_inline_version = iinfo->inline_version;
1008		if (ci->i_inline_version != CEPH_INLINE_NONE &&
1009		    (locked_page || (info_caps & cache_caps)))
 
1010			fill_inline = true;
1011	}
1012
1013	if (cap_fmode >= 0) {
1014		if (!info_caps)
1015			pr_warn("mds issued no caps on %llx.%llx\n",
1016				ceph_vinop(inode));
1017		__ceph_touch_fmode(ci, mdsc, cap_fmode);
1018	}
1019
1020	spin_unlock(&ci->i_ceph_lock);
1021
1022	if (fill_inline)
1023		ceph_fill_inline_data(inode, locked_page,
1024				      iinfo->inline_data, iinfo->inline_len);
1025
1026	if (wake)
1027		wake_up_all(&ci->i_cap_wq);
1028
1029	/* queue truncate if we saw i_size decrease */
1030	if (queue_trunc)
1031		ceph_queue_vmtruncate(inode);
1032
1033	/* populate frag tree */
1034	if (S_ISDIR(inode->i_mode))
1035		ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1036
1037	/* update delegation info? */
1038	if (dirinfo)
1039		ceph_fill_dirfrag(inode, dirinfo);
1040
1041	err = 0;
1042out:
1043	if (new_cap)
1044		ceph_put_cap(mdsc, new_cap);
1045	ceph_buffer_put(old_blob);
1046	ceph_buffer_put(xattr_blob);
1047	ceph_put_string(pool_ns);
1048	return err;
1049}
1050
1051/*
1052 * caller should hold session s_mutex and dentry->d_lock.
1053 */
1054static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1055				  struct ceph_mds_reply_lease *lease,
1056				  struct ceph_mds_session *session,
1057				  unsigned long from_time,
1058				  struct ceph_mds_session **old_lease_session)
 
1059{
1060	struct ceph_dentry_info *di = ceph_dentry(dentry);
1061	unsigned mask = le16_to_cpu(lease->mask);
1062	long unsigned duration = le32_to_cpu(lease->duration_ms);
1063	long unsigned ttl = from_time + (duration * HZ) / 1000;
1064	long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 
 
 
 
 
 
 
 
 
 
 
 
 
1065
 
1066	dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1067	     dentry, duration, ttl);
1068
 
 
 
 
 
 
1069	/* only track leases on regular dentries */
1070	if (ceph_snap(dir) != CEPH_NOSNAP)
1071		return;
1072
1073	if (mask & CEPH_LEASE_PRIMARY_LINK)
1074		di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1075	else
1076		di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1077
1078	di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1079	if (!(mask & CEPH_LEASE_VALID)) {
1080		__ceph_dentry_dir_lease_touch(di);
1081		return;
1082	}
1083
1084	if (di->lease_gen == session->s_cap_gen &&
1085	    time_before(ttl, di->time))
1086		return;  /* we already have a newer lease. */
1087
1088	if (di->lease_session && di->lease_session != session) {
1089		*old_lease_session = di->lease_session;
1090		di->lease_session = NULL;
1091	}
1092
 
 
1093	if (!di->lease_session)
1094		di->lease_session = ceph_get_mds_session(session);
1095	di->lease_gen = session->s_cap_gen;
1096	di->lease_seq = le32_to_cpu(lease->seq);
1097	di->lease_renew_after = half_ttl;
1098	di->lease_renew_from = 0;
1099	di->time = ttl;
1100
1101	__ceph_dentry_lease_touch(di);
1102}
1103
1104static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1105					struct ceph_mds_reply_lease *lease,
1106					struct ceph_mds_session *session,
1107					unsigned long from_time)
1108{
1109	struct ceph_mds_session *old_lease_session = NULL;
1110	spin_lock(&dentry->d_lock);
1111	__update_dentry_lease(dir, dentry, lease, session, from_time,
1112			      &old_lease_session);
1113	spin_unlock(&dentry->d_lock);
1114	if (old_lease_session)
1115		ceph_put_mds_session(old_lease_session);
1116}
1117
1118/*
1119 * update dentry lease without having parent inode locked
1120 */
1121static void update_dentry_lease_careful(struct dentry *dentry,
1122					struct ceph_mds_reply_lease *lease,
1123					struct ceph_mds_session *session,
1124					unsigned long from_time,
1125					char *dname, u32 dname_len,
1126					struct ceph_vino *pdvino,
1127					struct ceph_vino *ptvino)
1128
1129{
1130	struct inode *dir;
1131	struct ceph_mds_session *old_lease_session = NULL;
1132
1133	spin_lock(&dentry->d_lock);
1134	/* make sure dentry's name matches target */
1135	if (dentry->d_name.len != dname_len ||
1136	    memcmp(dentry->d_name.name, dname, dname_len))
1137		goto out_unlock;
1138
1139	dir = d_inode(dentry->d_parent);
1140	/* make sure parent matches dvino */
1141	if (!ceph_ino_compare(dir, pdvino))
1142		goto out_unlock;
1143
1144	/* make sure dentry's inode matches target. NULL ptvino means that
1145	 * we expect a negative dentry */
1146	if (ptvino) {
1147		if (d_really_is_negative(dentry))
1148			goto out_unlock;
1149		if (!ceph_ino_compare(d_inode(dentry), ptvino))
1150			goto out_unlock;
1151	} else {
1152		if (d_really_is_positive(dentry))
1153			goto out_unlock;
1154	}
1155
1156	__update_dentry_lease(dir, dentry, lease, session,
1157			      from_time, &old_lease_session);
1158out_unlock:
1159	spin_unlock(&dentry->d_lock);
1160	if (old_lease_session)
1161		ceph_put_mds_session(old_lease_session);
1162}
1163
1164/*
1165 * splice a dentry to an inode.
1166 * caller must hold directory i_mutex for this to be safe.
1167 */
1168static int splice_dentry(struct dentry **pdn, struct inode *in)
1169{
1170	struct dentry *dn = *pdn;
1171	struct dentry *realdn;
1172
1173	BUG_ON(d_inode(dn));
1174
1175	if (S_ISDIR(in->i_mode)) {
1176		/* If inode is directory, d_splice_alias() below will remove
1177		 * 'realdn' from its origin parent. We need to ensure that
1178		 * origin parent's readdir cache will not reference 'realdn'
1179		 */
1180		realdn = d_find_any_alias(in);
1181		if (realdn) {
1182			struct ceph_dentry_info *di = ceph_dentry(realdn);
1183			spin_lock(&realdn->d_lock);
1184
1185			realdn->d_op->d_prune(realdn);
1186
1187			di->time = jiffies;
1188			di->lease_shared_gen = 0;
1189			di->offset = 0;
1190
1191			spin_unlock(&realdn->d_lock);
1192			dput(realdn);
1193		}
1194	}
1195
1196	/* dn must be unhashed */
1197	if (!d_unhashed(dn))
1198		d_drop(dn);
1199	realdn = d_splice_alias(in, dn);
1200	if (IS_ERR(realdn)) {
1201		pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1202		       PTR_ERR(realdn), dn, in, ceph_vinop(in));
1203		return PTR_ERR(realdn);
1204	}
1205
1206	if (realdn) {
1207		dout("dn %p (%d) spliced with %p (%d) "
1208		     "inode %p ino %llx.%llx\n",
1209		     dn, d_count(dn),
1210		     realdn, d_count(realdn),
1211		     d_inode(realdn), ceph_vinop(d_inode(realdn)));
1212		dput(dn);
1213		*pdn = realdn;
1214	} else {
1215		BUG_ON(!ceph_dentry(dn));
1216		dout("dn %p attached to %p ino %llx.%llx\n",
1217		     dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1218	}
1219	return 0;
 
1220}
1221
1222/*
1223 * Incorporate results into the local cache.  This is either just
1224 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1225 * after a lookup).
1226 *
1227 * A reply may contain
1228 *         a directory inode along with a dentry.
1229 *  and/or a target inode
1230 *
1231 * Called with snap_rwsem (read).
1232 */
1233int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1234{
1235	struct ceph_mds_session *session = req->r_session;
1236	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1237	struct inode *in = NULL;
1238	struct ceph_vino tvino, dvino;
1239	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1240	int err = 0;
1241
1242	dout("fill_trace %p is_dentry %d is_target %d\n", req,
1243	     rinfo->head->is_dentry, rinfo->head->is_target);
1244
1245	if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1246		dout("fill_trace reply is empty!\n");
1247		if (rinfo->head->result == 0 && req->r_parent)
1248			ceph_invalidate_dir_request(req);
1249		return 0;
1250	}
1251
1252	if (rinfo->head->is_dentry) {
1253		struct inode *dir = req->r_parent;
1254
1255		if (dir) {
1256			err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1257					      rinfo->dirfrag, session, -1,
1258					      &req->r_caps_reservation);
 
1259			if (err < 0)
1260				goto done;
1261		} else {
1262			WARN_ON_ONCE(1);
1263		}
1264
1265		if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1266		    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1267		    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1268			struct qstr dname;
1269			struct dentry *dn, *parent;
1270
1271			BUG_ON(!rinfo->head->is_target);
1272			BUG_ON(req->r_dentry);
1273
1274			parent = d_find_any_alias(dir);
1275			BUG_ON(!parent);
1276
1277			dname.name = rinfo->dname;
1278			dname.len = rinfo->dname_len;
1279			dname.hash = full_name_hash(parent, dname.name, dname.len);
1280			tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1281			tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1282retry_lookup:
1283			dn = d_lookup(parent, &dname);
1284			dout("d_lookup on parent=%p name=%.*s got %p\n",
1285			     parent, dname.len, dname.name, dn);
1286
1287			if (!dn) {
1288				dn = d_alloc(parent, &dname);
1289				dout("d_alloc %p '%.*s' = %p\n", parent,
1290				     dname.len, dname.name, dn);
1291				if (!dn) {
1292					dput(parent);
1293					err = -ENOMEM;
1294					goto done;
1295				}
1296				err = 0;
1297			} else if (d_really_is_positive(dn) &&
1298				   (ceph_ino(d_inode(dn)) != tvino.ino ||
1299				    ceph_snap(d_inode(dn)) != tvino.snap)) {
1300				dout(" dn %p points to wrong inode %p\n",
1301				     dn, d_inode(dn));
1302				ceph_dir_clear_ordered(dir);
1303				d_delete(dn);
1304				dput(dn);
1305				goto retry_lookup;
1306			}
1307
1308			req->r_dentry = dn;
1309			dput(parent);
1310		}
1311	}
1312
1313	if (rinfo->head->is_target) {
1314		tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1315		tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1316
1317		in = ceph_get_inode(sb, tvino);
1318		if (IS_ERR(in)) {
1319			err = PTR_ERR(in);
1320			goto done;
1321		}
 
1322
1323		err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1324				NULL, session,
1325				(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1326				 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1327				 rinfo->head->result == 0) ?  req->r_fmode : -1,
1328				&req->r_caps_reservation);
1329		if (err < 0) {
1330			pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1331				in, ceph_vinop(in));
1332			if (in->i_state & I_NEW)
1333				discard_new_inode(in);
1334			goto done;
1335		}
1336		req->r_target_inode = in;
1337		if (in->i_state & I_NEW)
1338			unlock_new_inode(in);
1339	}
1340
1341	/*
1342	 * ignore null lease/binding on snapdir ENOENT, or else we
1343	 * will have trouble splicing in the virtual snapdir later
1344	 */
1345	if (rinfo->head->is_dentry &&
1346            !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1347	    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1348	    (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1349					       fsc->mount_options->snapdir_name,
1350					       req->r_dentry->d_name.len))) {
1351		/*
1352		 * lookup link rename   : null -> possibly existing inode
1353		 * mknod symlink mkdir  : null -> new inode
1354		 * unlink               : linked -> null
1355		 */
1356		struct inode *dir = req->r_parent;
1357		struct dentry *dn = req->r_dentry;
1358		bool have_dir_cap, have_lease;
1359
1360		BUG_ON(!dn);
1361		BUG_ON(!dir);
1362		BUG_ON(d_inode(dn->d_parent) != dir);
1363
1364		dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1365		dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1366
1367		BUG_ON(ceph_ino(dir) != dvino.ino);
1368		BUG_ON(ceph_snap(dir) != dvino.snap);
1369
1370		/* do we have a lease on the whole dir? */
1371		have_dir_cap =
1372			(le32_to_cpu(rinfo->diri.in->cap.caps) &
1373			 CEPH_CAP_FILE_SHARED);
1374
1375		/* do we have a dn lease? */
1376		have_lease = have_dir_cap ||
1377			le32_to_cpu(rinfo->dlease->duration_ms);
1378		if (!have_lease)
1379			dout("fill_trace  no dentry lease or dir cap\n");
1380
1381		/* rename? */
1382		if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1383			struct inode *olddir = req->r_old_dentry_dir;
1384			BUG_ON(!olddir);
1385
1386			dout(" src %p '%pd' dst %p '%pd'\n",
1387			     req->r_old_dentry,
1388			     req->r_old_dentry,
1389			     dn, dn);
1390			dout("fill_trace doing d_move %p -> %p\n",
1391			     req->r_old_dentry, dn);
1392
1393			/* d_move screws up sibling dentries' offsets */
1394			ceph_dir_clear_ordered(dir);
1395			ceph_dir_clear_ordered(olddir);
1396
1397			d_move(req->r_old_dentry, dn);
1398			dout(" src %p '%pd' dst %p '%pd'\n",
1399			     req->r_old_dentry,
1400			     req->r_old_dentry,
1401			     dn, dn);
1402
1403			/* ensure target dentry is invalidated, despite
1404			   rehashing bug in vfs_rename_dir */
1405			ceph_invalidate_dentry_lease(dn);
1406
1407			dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1408			     ceph_dentry(req->r_old_dentry)->offset);
1409
1410			/* swap r_dentry and r_old_dentry in case that
1411			 * splice_dentry() gets called later. This is safe
1412			 * because no other place will use them */
1413			req->r_dentry = req->r_old_dentry;
1414			req->r_old_dentry = dn;
1415			dn = req->r_dentry;
1416		}
1417
1418		/* null dentry? */
1419		if (!rinfo->head->is_target) {
1420			dout("fill_trace null dentry\n");
1421			if (d_really_is_positive(dn)) {
1422				dout("d_delete %p\n", dn);
1423				ceph_dir_clear_ordered(dir);
1424				d_delete(dn);
1425			} else if (have_lease) {
1426				if (d_unhashed(dn))
1427					d_add(dn, NULL);
1428				update_dentry_lease(dir, dn,
1429						    rinfo->dlease, session,
1430						    req->r_request_started);
 
1431			}
1432			goto done;
1433		}
1434
1435		/* attach proper inode */
1436		if (d_really_is_negative(dn)) {
1437			ceph_dir_clear_ordered(dir);
1438			ihold(in);
1439			err = splice_dentry(&req->r_dentry, in);
1440			if (err < 0)
 
1441				goto done;
1442			dn = req->r_dentry;  /* may have spliced */
 
1443		} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1444			dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1445			     dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1446			     ceph_vinop(in));
1447			d_invalidate(dn);
1448			have_lease = false;
1449		}
1450
1451		if (have_lease) {
1452			update_dentry_lease(dir, dn,
1453					    rinfo->dlease, session,
1454					    req->r_request_started);
 
 
1455		}
1456		dout(" final dn %p\n", dn);
1457	} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1458		    req->r_op == CEPH_MDS_OP_MKSNAP) &&
1459	           test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1460		   !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
 
1461		struct inode *dir = req->r_parent;
1462
1463		/* fill out a snapdir LOOKUPSNAP dentry */
 
1464		BUG_ON(!dir);
1465		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1466		BUG_ON(!req->r_dentry);
1467		dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1468		ceph_dir_clear_ordered(dir);
1469		ihold(in);
1470		err = splice_dentry(&req->r_dentry, in);
1471		if (err < 0)
 
1472			goto done;
1473	} else if (rinfo->head->is_dentry && req->r_dentry) {
1474		/* parent inode is not locked, be carefull */
 
1475		struct ceph_vino *ptvino = NULL;
1476		dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1477		dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1478		if (rinfo->head->is_target) {
1479			tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1480			tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1481			ptvino = &tvino;
 
 
 
 
 
 
 
 
 
 
 
1482		}
1483		update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1484					    session, req->r_request_started,
1485					    rinfo->dname, rinfo->dname_len,
1486					    &dvino, ptvino);
1487	}
1488done:
1489	dout("fill_trace done err=%d\n", err);
1490	return err;
1491}
1492
1493/*
1494 * Prepopulate our cache with readdir results, leases, etc.
1495 */
1496static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1497					   struct ceph_mds_session *session)
1498{
1499	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1500	int i, err = 0;
1501
1502	for (i = 0; i < rinfo->dir_nr; i++) {
1503		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1504		struct ceph_vino vino;
1505		struct inode *in;
1506		int rc;
1507
1508		vino.ino = le64_to_cpu(rde->inode.in->ino);
1509		vino.snap = le64_to_cpu(rde->inode.in->snapid);
1510
1511		in = ceph_get_inode(req->r_dentry->d_sb, vino);
1512		if (IS_ERR(in)) {
1513			err = PTR_ERR(in);
1514			dout("new_inode badness got %d\n", err);
1515			continue;
1516		}
1517		rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1518				     -1, &req->r_caps_reservation);
 
1519		if (rc < 0) {
1520			pr_err("ceph_fill_inode badness on %p got %d\n",
1521			       in, rc);
1522			err = rc;
1523			if (in->i_state & I_NEW) {
1524				ihold(in);
1525				discard_new_inode(in);
1526			}
1527		} else if (in->i_state & I_NEW) {
1528			unlock_new_inode(in);
1529		}
1530
1531		/* avoid calling iput_final() in mds dispatch threads */
1532		ceph_async_iput(in);
1533	}
1534
1535	return err;
1536}
1537
1538void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1539{
1540	if (ctl->page) {
1541		kunmap(ctl->page);
1542		put_page(ctl->page);
1543		ctl->page = NULL;
1544	}
1545}
1546
1547static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1548			      struct ceph_readdir_cache_control *ctl,
1549			      struct ceph_mds_request *req)
1550{
1551	struct ceph_inode_info *ci = ceph_inode(dir);
1552	unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1553	unsigned idx = ctl->index % nsize;
1554	pgoff_t pgoff = ctl->index / nsize;
1555
1556	if (!ctl->page || pgoff != page_index(ctl->page)) {
1557		ceph_readdir_cache_release(ctl);
1558		if (idx == 0)
1559			ctl->page = grab_cache_page(&dir->i_data, pgoff);
1560		else
1561			ctl->page = find_lock_page(&dir->i_data, pgoff);
1562		if (!ctl->page) {
1563			ctl->index = -1;
1564			return idx == 0 ? -ENOMEM : 0;
1565		}
1566		/* reading/filling the cache are serialized by
1567		 * i_mutex, no need to use page lock */
1568		unlock_page(ctl->page);
1569		ctl->dentries = kmap(ctl->page);
1570		if (idx == 0)
1571			memset(ctl->dentries, 0, PAGE_SIZE);
1572	}
1573
1574	if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1575	    req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1576		dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1577		ctl->dentries[idx] = dn;
1578		ctl->index++;
1579	} else {
1580		dout("disable readdir cache\n");
1581		ctl->index = -1;
1582	}
1583	return 0;
1584}
1585
1586int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1587			     struct ceph_mds_session *session)
1588{
1589	struct dentry *parent = req->r_dentry;
1590	struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1591	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1592	struct qstr dname;
1593	struct dentry *dn;
1594	struct inode *in;
1595	int err = 0, skipped = 0, ret, i;
1596	struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1597	u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1598	u32 last_hash = 0;
1599	u32 fpos_offset;
1600	struct ceph_readdir_cache_control cache_ctl = {};
1601
1602	if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1603		return readdir_prepopulate_inodes_only(req, session);
1604
1605	if (rinfo->hash_order) {
1606		if (req->r_path2) {
1607			last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1608						  req->r_path2,
1609						  strlen(req->r_path2));
1610			last_hash = ceph_frag_value(last_hash);
1611		} else if (rinfo->offset_hash) {
1612			/* mds understands offset_hash */
1613			WARN_ON_ONCE(req->r_readdir_offset != 2);
1614			last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1615		}
1616	}
1617
1618	if (rinfo->dir_dir &&
1619	    le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1620		dout("readdir_prepopulate got new frag %x -> %x\n",
1621		     frag, le32_to_cpu(rinfo->dir_dir->frag));
1622		frag = le32_to_cpu(rinfo->dir_dir->frag);
1623		if (!rinfo->hash_order)
1624			req->r_readdir_offset = 2;
1625	}
1626
1627	if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1628		dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1629		     rinfo->dir_nr, parent);
1630	} else {
1631		dout("readdir_prepopulate %d items under dn %p\n",
1632		     rinfo->dir_nr, parent);
1633		if (rinfo->dir_dir)
1634			ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1635
1636		if (ceph_frag_is_leftmost(frag) &&
1637		    req->r_readdir_offset == 2 &&
1638		    !(rinfo->hash_order && last_hash)) {
1639			/* note dir version at start of readdir so we can
1640			 * tell if any dentries get dropped */
1641			req->r_dir_release_cnt =
1642				atomic64_read(&ci->i_release_count);
1643			req->r_dir_ordered_cnt =
1644				atomic64_read(&ci->i_ordered_count);
1645			req->r_readdir_cache_idx = 0;
1646		}
1647	}
1648
1649	cache_ctl.index = req->r_readdir_cache_idx;
1650	fpos_offset = req->r_readdir_offset;
1651
1652	/* FIXME: release caps/leases if error occurs */
1653	for (i = 0; i < rinfo->dir_nr; i++) {
1654		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1655		struct ceph_vino tvino;
1656
1657		dname.name = rde->name;
1658		dname.len = rde->name_len;
1659		dname.hash = full_name_hash(parent, dname.name, dname.len);
1660
1661		tvino.ino = le64_to_cpu(rde->inode.in->ino);
1662		tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1663
1664		if (rinfo->hash_order) {
1665			u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1666						 rde->name, rde->name_len);
1667			hash = ceph_frag_value(hash);
1668			if (hash != last_hash)
1669				fpos_offset = 2;
1670			last_hash = hash;
1671			rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1672		} else {
1673			rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1674		}
1675
1676retry_lookup:
1677		dn = d_lookup(parent, &dname);
1678		dout("d_lookup on parent=%p name=%.*s got %p\n",
1679		     parent, dname.len, dname.name, dn);
1680
1681		if (!dn) {
1682			dn = d_alloc(parent, &dname);
1683			dout("d_alloc %p '%.*s' = %p\n", parent,
1684			     dname.len, dname.name, dn);
1685			if (!dn) {
1686				dout("d_alloc badness\n");
1687				err = -ENOMEM;
1688				goto out;
1689			}
1690		} else if (d_really_is_positive(dn) &&
1691			   (ceph_ino(d_inode(dn)) != tvino.ino ||
1692			    ceph_snap(d_inode(dn)) != tvino.snap)) {
1693			struct ceph_dentry_info *di = ceph_dentry(dn);
1694			dout(" dn %p points to wrong inode %p\n",
1695			     dn, d_inode(dn));
1696
1697			spin_lock(&dn->d_lock);
1698			if (di->offset > 0 &&
1699			    di->lease_shared_gen ==
1700			    atomic_read(&ci->i_shared_gen)) {
1701				__ceph_dir_clear_ordered(ci);
1702				di->offset = 0;
1703			}
1704			spin_unlock(&dn->d_lock);
1705
1706			d_delete(dn);
1707			dput(dn);
1708			goto retry_lookup;
1709		}
1710
1711		/* inode */
1712		if (d_really_is_positive(dn)) {
1713			in = d_inode(dn);
1714		} else {
1715			in = ceph_get_inode(parent->d_sb, tvino);
1716			if (IS_ERR(in)) {
1717				dout("new_inode badness\n");
1718				d_drop(dn);
1719				dput(dn);
1720				err = PTR_ERR(in);
1721				goto out;
1722			}
1723		}
1724
1725		ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1726				      -1, &req->r_caps_reservation);
 
1727		if (ret < 0) {
1728			pr_err("ceph_fill_inode badness on %p\n", in);
1729			if (d_really_is_negative(dn)) {
1730				/* avoid calling iput_final() in mds
1731				 * dispatch threads */
1732				if (in->i_state & I_NEW) {
1733					ihold(in);
1734					discard_new_inode(in);
1735				}
1736				ceph_async_iput(in);
1737			}
1738			d_drop(dn);
1739			err = ret;
1740			goto next_item;
1741		}
1742		if (in->i_state & I_NEW)
1743			unlock_new_inode(in);
1744
1745		if (d_really_is_negative(dn)) {
 
 
1746			if (ceph_security_xattr_deadlock(in)) {
1747				dout(" skip splicing dn %p to inode %p"
1748				     " (security xattr deadlock)\n", dn, in);
1749				ceph_async_iput(in);
1750				skipped++;
1751				goto next_item;
1752			}
1753
1754			err = splice_dentry(&dn, in);
1755			if (err < 0)
 
 
 
1756				goto next_item;
 
 
1757		}
1758
1759		ceph_dentry(dn)->offset = rde->offset;
1760
1761		update_dentry_lease(d_inode(parent), dn,
1762				    rde->lease, req->r_session,
1763				    req->r_request_started);
1764
1765		if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1766			ret = fill_readdir_cache(d_inode(parent), dn,
1767						 &cache_ctl, req);
1768			if (ret < 0)
1769				err = ret;
1770		}
1771next_item:
1772		dput(dn);
 
1773	}
1774out:
1775	if (err == 0 && skipped == 0) {
1776		set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1777		req->r_readdir_cache_idx = cache_ctl.index;
1778	}
1779	ceph_readdir_cache_release(&cache_ctl);
1780	dout("readdir_prepopulate done\n");
1781	return err;
1782}
1783
1784bool ceph_inode_set_size(struct inode *inode, loff_t size)
1785{
1786	struct ceph_inode_info *ci = ceph_inode(inode);
1787	bool ret;
1788
1789	spin_lock(&ci->i_ceph_lock);
1790	dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1791	i_size_write(inode, size);
1792	inode->i_blocks = calc_inode_blocks(size);
1793
1794	ret = __ceph_should_report_size(ci);
1795
1796	spin_unlock(&ci->i_ceph_lock);
1797	return ret;
1798}
1799
1800/*
1801 * Put reference to inode, but avoid calling iput_final() in current thread.
1802 * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1803 * some contexts.
1804 */
1805void ceph_async_iput(struct inode *inode)
1806{
1807	if (!inode)
1808		return;
1809	for (;;) {
1810		if (atomic_add_unless(&inode->i_count, -1, 1))
1811			break;
1812		if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1813			       &ceph_inode(inode)->i_work))
1814			break;
1815		/* queue work failed, i_count must be at least 2 */
1816	}
1817}
1818
1819/*
1820 * Write back inode data in a worker thread.  (This can't be done
1821 * in the message handler context.)
1822 */
1823void ceph_queue_writeback(struct inode *inode)
1824{
1825	struct ceph_inode_info *ci = ceph_inode(inode);
1826	set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1827
1828	ihold(inode);
1829	if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1830		       &ci->i_work)) {
1831		dout("ceph_queue_writeback %p\n", inode);
1832	} else {
1833		dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1834		     inode, ci->i_work_mask);
1835		iput(inode);
1836	}
1837}
1838
 
 
 
 
 
 
 
 
 
 
 
1839/*
1840 * queue an async invalidation
1841 */
1842void ceph_queue_invalidate(struct inode *inode)
1843{
1844	struct ceph_inode_info *ci = ceph_inode(inode);
1845	set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1846
1847	ihold(inode);
1848	if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1849		       &ceph_inode(inode)->i_work)) {
1850		dout("ceph_queue_invalidate %p\n", inode);
1851	} else {
1852		dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1853		     inode, ci->i_work_mask);
1854		iput(inode);
1855	}
1856}
1857
1858/*
1859 * Queue an async vmtruncate.  If we fail to queue work, we will handle
1860 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1861 */
1862void ceph_queue_vmtruncate(struct inode *inode)
1863{
1864	struct ceph_inode_info *ci = ceph_inode(inode);
1865	set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1866
1867	ihold(inode);
1868	if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1869		       &ci->i_work)) {
1870		dout("ceph_queue_vmtruncate %p\n", inode);
1871	} else {
1872		dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1873		     inode, ci->i_work_mask);
1874		iput(inode);
1875	}
1876}
1877
1878static void ceph_do_invalidate_pages(struct inode *inode)
1879{
1880	struct ceph_inode_info *ci = ceph_inode(inode);
1881	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1882	u32 orig_gen;
1883	int check = 0;
1884
1885	mutex_lock(&ci->i_truncate_mutex);
1886
1887	if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1888		pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1889				    inode, ceph_ino(inode));
1890		mapping_set_error(inode->i_mapping, -EIO);
1891		truncate_pagecache(inode, 0);
1892		mutex_unlock(&ci->i_truncate_mutex);
1893		goto out;
1894	}
1895
1896	spin_lock(&ci->i_ceph_lock);
1897	dout("invalidate_pages %p gen %d revoking %d\n", inode,
1898	     ci->i_rdcache_gen, ci->i_rdcache_revoking);
1899	if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1900		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1901			check = 1;
1902		spin_unlock(&ci->i_ceph_lock);
1903		mutex_unlock(&ci->i_truncate_mutex);
1904		goto out;
1905	}
1906	orig_gen = ci->i_rdcache_gen;
1907	spin_unlock(&ci->i_ceph_lock);
1908
1909	if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1910		pr_err("invalidate_pages %p fails\n", inode);
1911	}
1912
1913	spin_lock(&ci->i_ceph_lock);
1914	if (orig_gen == ci->i_rdcache_gen &&
1915	    orig_gen == ci->i_rdcache_revoking) {
1916		dout("invalidate_pages %p gen %d successful\n", inode,
1917		     ci->i_rdcache_gen);
1918		ci->i_rdcache_revoking--;
1919		check = 1;
1920	} else {
1921		dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1922		     inode, orig_gen, ci->i_rdcache_gen,
1923		     ci->i_rdcache_revoking);
1924		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1925			check = 1;
1926	}
1927	spin_unlock(&ci->i_ceph_lock);
1928	mutex_unlock(&ci->i_truncate_mutex);
1929out:
1930	if (check)
1931		ceph_check_caps(ci, 0, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1932}
1933
1934/*
1935 * Make sure any pending truncation is applied before doing anything
1936 * that may depend on it.
1937 */
1938void __ceph_do_pending_vmtruncate(struct inode *inode)
1939{
1940	struct ceph_inode_info *ci = ceph_inode(inode);
1941	u64 to;
1942	int wrbuffer_refs, finish = 0;
1943
1944	mutex_lock(&ci->i_truncate_mutex);
1945retry:
1946	spin_lock(&ci->i_ceph_lock);
1947	if (ci->i_truncate_pending == 0) {
1948		dout("__do_pending_vmtruncate %p none pending\n", inode);
1949		spin_unlock(&ci->i_ceph_lock);
1950		mutex_unlock(&ci->i_truncate_mutex);
1951		return;
1952	}
1953
1954	/*
1955	 * make sure any dirty snapped pages are flushed before we
1956	 * possibly truncate them.. so write AND block!
1957	 */
1958	if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1959		spin_unlock(&ci->i_ceph_lock);
1960		dout("__do_pending_vmtruncate %p flushing snaps first\n",
1961		     inode);
1962		filemap_write_and_wait_range(&inode->i_data, 0,
1963					     inode->i_sb->s_maxbytes);
1964		goto retry;
1965	}
1966
1967	/* there should be no reader or writer */
1968	WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1969
1970	to = ci->i_truncate_size;
1971	wrbuffer_refs = ci->i_wrbuffer_ref;
1972	dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1973	     ci->i_truncate_pending, to);
1974	spin_unlock(&ci->i_ceph_lock);
1975
1976	truncate_pagecache(inode, to);
1977
1978	spin_lock(&ci->i_ceph_lock);
1979	if (to == ci->i_truncate_size) {
1980		ci->i_truncate_pending = 0;
1981		finish = 1;
1982	}
1983	spin_unlock(&ci->i_ceph_lock);
1984	if (!finish)
1985		goto retry;
1986
1987	mutex_unlock(&ci->i_truncate_mutex);
1988
1989	if (wrbuffer_refs == 0)
1990		ceph_check_caps(ci, 0, NULL);
1991
1992	wake_up_all(&ci->i_cap_wq);
1993}
1994
1995static void ceph_inode_work(struct work_struct *work)
1996{
1997	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1998						 i_work);
1999	struct inode *inode = &ci->vfs_inode;
2000
2001	if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2002		dout("writeback %p\n", inode);
2003		filemap_fdatawrite(&inode->i_data);
2004	}
2005	if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2006		ceph_do_invalidate_pages(inode);
2007
2008	if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2009		__ceph_do_pending_vmtruncate(inode);
2010
2011	iput(inode);
2012}
2013
2014/*
2015 * symlinks
2016 */
2017static const struct inode_operations ceph_symlink_iops = {
2018	.get_link = simple_get_link,
2019	.setattr = ceph_setattr,
2020	.getattr = ceph_getattr,
2021	.listxattr = ceph_listxattr,
2022};
2023
2024int __ceph_setattr(struct inode *inode, struct iattr *attr)
2025{
2026	struct ceph_inode_info *ci = ceph_inode(inode);
2027	unsigned int ia_valid = attr->ia_valid;
2028	struct ceph_mds_request *req;
2029	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2030	struct ceph_cap_flush *prealloc_cf;
2031	int issued;
2032	int release = 0, dirtied = 0;
2033	int mask = 0;
2034	int err = 0;
2035	int inode_dirty_flags = 0;
2036	bool lock_snap_rwsem = false;
2037
2038	prealloc_cf = ceph_alloc_cap_flush();
2039	if (!prealloc_cf)
2040		return -ENOMEM;
2041
2042	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2043				       USE_AUTH_MDS);
2044	if (IS_ERR(req)) {
2045		ceph_free_cap_flush(prealloc_cf);
2046		return PTR_ERR(req);
2047	}
2048
2049	spin_lock(&ci->i_ceph_lock);
2050	issued = __ceph_caps_issued(ci, NULL);
2051
2052	if (!ci->i_head_snapc &&
2053	    (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2054		lock_snap_rwsem = true;
2055		if (!down_read_trylock(&mdsc->snap_rwsem)) {
2056			spin_unlock(&ci->i_ceph_lock);
2057			down_read(&mdsc->snap_rwsem);
2058			spin_lock(&ci->i_ceph_lock);
2059			issued = __ceph_caps_issued(ci, NULL);
2060		}
2061	}
2062
2063	dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2064
2065	if (ia_valid & ATTR_UID) {
2066		dout("setattr %p uid %d -> %d\n", inode,
2067		     from_kuid(&init_user_ns, inode->i_uid),
2068		     from_kuid(&init_user_ns, attr->ia_uid));
2069		if (issued & CEPH_CAP_AUTH_EXCL) {
2070			inode->i_uid = attr->ia_uid;
2071			dirtied |= CEPH_CAP_AUTH_EXCL;
2072		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2073			   !uid_eq(attr->ia_uid, inode->i_uid)) {
2074			req->r_args.setattr.uid = cpu_to_le32(
2075				from_kuid(&init_user_ns, attr->ia_uid));
2076			mask |= CEPH_SETATTR_UID;
2077			release |= CEPH_CAP_AUTH_SHARED;
2078		}
2079	}
2080	if (ia_valid & ATTR_GID) {
2081		dout("setattr %p gid %d -> %d\n", inode,
2082		     from_kgid(&init_user_ns, inode->i_gid),
2083		     from_kgid(&init_user_ns, attr->ia_gid));
2084		if (issued & CEPH_CAP_AUTH_EXCL) {
2085			inode->i_gid = attr->ia_gid;
2086			dirtied |= CEPH_CAP_AUTH_EXCL;
2087		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2088			   !gid_eq(attr->ia_gid, inode->i_gid)) {
2089			req->r_args.setattr.gid = cpu_to_le32(
2090				from_kgid(&init_user_ns, attr->ia_gid));
2091			mask |= CEPH_SETATTR_GID;
2092			release |= CEPH_CAP_AUTH_SHARED;
2093		}
2094	}
2095	if (ia_valid & ATTR_MODE) {
2096		dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2097		     attr->ia_mode);
2098		if (issued & CEPH_CAP_AUTH_EXCL) {
2099			inode->i_mode = attr->ia_mode;
2100			dirtied |= CEPH_CAP_AUTH_EXCL;
2101		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2102			   attr->ia_mode != inode->i_mode) {
2103			inode->i_mode = attr->ia_mode;
2104			req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2105			mask |= CEPH_SETATTR_MODE;
2106			release |= CEPH_CAP_AUTH_SHARED;
2107		}
2108	}
2109
2110	if (ia_valid & ATTR_ATIME) {
2111		dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2112		     inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2113		     attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2114		if (issued & CEPH_CAP_FILE_EXCL) {
2115			ci->i_time_warp_seq++;
2116			inode->i_atime = attr->ia_atime;
2117			dirtied |= CEPH_CAP_FILE_EXCL;
2118		} else if ((issued & CEPH_CAP_FILE_WR) &&
2119			   timespec64_compare(&inode->i_atime,
2120					    &attr->ia_atime) < 0) {
2121			inode->i_atime = attr->ia_atime;
2122			dirtied |= CEPH_CAP_FILE_WR;
2123		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2124			   !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2125			ceph_encode_timespec64(&req->r_args.setattr.atime,
2126					       &attr->ia_atime);
2127			mask |= CEPH_SETATTR_ATIME;
2128			release |= CEPH_CAP_FILE_SHARED |
2129				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2130		}
2131	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2132	if (ia_valid & ATTR_SIZE) {
2133		dout("setattr %p size %lld -> %lld\n", inode,
2134		     inode->i_size, attr->ia_size);
2135		if ((issued & CEPH_CAP_FILE_EXCL) &&
2136		    attr->ia_size > inode->i_size) {
2137			i_size_write(inode, attr->ia_size);
2138			inode->i_blocks = calc_inode_blocks(attr->ia_size);
2139			ci->i_reported_size = attr->ia_size;
2140			dirtied |= CEPH_CAP_FILE_EXCL;
2141			ia_valid |= ATTR_MTIME;
2142		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2143			   attr->ia_size != inode->i_size) {
2144			req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2145			req->r_args.setattr.old_size =
2146				cpu_to_le64(inode->i_size);
2147			mask |= CEPH_SETATTR_SIZE;
2148			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2149				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2150		}
2151	}
2152	if (ia_valid & ATTR_MTIME) {
2153		dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2154		     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2155		     attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2156		if (issued & CEPH_CAP_FILE_EXCL) {
2157			ci->i_time_warp_seq++;
2158			inode->i_mtime = attr->ia_mtime;
2159			dirtied |= CEPH_CAP_FILE_EXCL;
2160		} else if ((issued & CEPH_CAP_FILE_WR) &&
2161			   timespec64_compare(&inode->i_mtime,
2162					    &attr->ia_mtime) < 0) {
2163			inode->i_mtime = attr->ia_mtime;
2164			dirtied |= CEPH_CAP_FILE_WR;
2165		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2166			   !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2167			ceph_encode_timespec64(&req->r_args.setattr.mtime,
2168					       &attr->ia_mtime);
2169			mask |= CEPH_SETATTR_MTIME;
2170			release |= CEPH_CAP_FILE_SHARED |
2171				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2172		}
2173	}
2174
2175	/* these do nothing */
2176	if (ia_valid & ATTR_CTIME) {
2177		bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2178					 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2179		dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2180		     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2181		     attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2182		     only ? "ctime only" : "ignored");
2183		if (only) {
2184			/*
2185			 * if kernel wants to dirty ctime but nothing else,
2186			 * we need to choose a cap to dirty under, or do
2187			 * a almost-no-op setattr
2188			 */
2189			if (issued & CEPH_CAP_AUTH_EXCL)
2190				dirtied |= CEPH_CAP_AUTH_EXCL;
2191			else if (issued & CEPH_CAP_FILE_EXCL)
2192				dirtied |= CEPH_CAP_FILE_EXCL;
2193			else if (issued & CEPH_CAP_XATTR_EXCL)
2194				dirtied |= CEPH_CAP_XATTR_EXCL;
2195			else
2196				mask |= CEPH_SETATTR_CTIME;
2197		}
2198	}
2199	if (ia_valid & ATTR_FILE)
2200		dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2201
2202	if (dirtied) {
2203		inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2204							   &prealloc_cf);
2205		inode->i_ctime = attr->ia_ctime;
2206	}
2207
2208	release &= issued;
2209	spin_unlock(&ci->i_ceph_lock);
2210	if (lock_snap_rwsem)
2211		up_read(&mdsc->snap_rwsem);
2212
2213	if (inode_dirty_flags)
2214		__mark_inode_dirty(inode, inode_dirty_flags);
2215
2216
2217	if (mask) {
2218		req->r_inode = inode;
2219		ihold(inode);
2220		req->r_inode_drop = release;
2221		req->r_args.setattr.mask = cpu_to_le32(mask);
2222		req->r_num_caps = 1;
2223		req->r_stamp = attr->ia_ctime;
2224		err = ceph_mdsc_do_request(mdsc, NULL, req);
2225	}
2226	dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2227	     ceph_cap_string(dirtied), mask);
2228
2229	ceph_mdsc_put_request(req);
2230	ceph_free_cap_flush(prealloc_cf);
2231
2232	if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2233		__ceph_do_pending_vmtruncate(inode);
2234
2235	return err;
2236}
2237
2238/*
2239 * setattr
2240 */
2241int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2242{
2243	struct inode *inode = d_inode(dentry);
2244	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2245	int err;
2246
2247	if (ceph_snap(inode) != CEPH_NOSNAP)
2248		return -EROFS;
2249
2250	err = setattr_prepare(dentry, attr);
2251	if (err != 0)
2252		return err;
2253
2254	if ((attr->ia_valid & ATTR_SIZE) &&
2255	    attr->ia_size > max(inode->i_size, fsc->max_file_size))
2256		return -EFBIG;
2257
2258	if ((attr->ia_valid & ATTR_SIZE) &&
2259	    ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2260		return -EDQUOT;
2261
2262	err = __ceph_setattr(inode, attr);
2263
2264	if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2265		err = posix_acl_chmod(inode, attr->ia_mode);
2266
2267	return err;
2268}
2269
2270/*
2271 * Verify that we have a lease on the given mask.  If not,
2272 * do a getattr against an mds.
2273 */
2274int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2275		      int mask, bool force)
2276{
2277	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2278	struct ceph_mds_client *mdsc = fsc->mdsc;
2279	struct ceph_mds_request *req;
2280	int mode;
2281	int err;
2282
2283	if (ceph_snap(inode) == CEPH_SNAPDIR) {
2284		dout("do_getattr inode %p SNAPDIR\n", inode);
2285		return 0;
2286	}
2287
2288	dout("do_getattr inode %p mask %s mode 0%o\n",
2289	     inode, ceph_cap_string(mask), inode->i_mode);
2290	if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2291			return 0;
2292
2293	mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2294	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2295	if (IS_ERR(req))
2296		return PTR_ERR(req);
2297	req->r_inode = inode;
2298	ihold(inode);
2299	req->r_num_caps = 1;
2300	req->r_args.getattr.mask = cpu_to_le32(mask);
2301	req->r_locked_page = locked_page;
2302	err = ceph_mdsc_do_request(mdsc, NULL, req);
2303	if (locked_page && err == 0) {
2304		u64 inline_version = req->r_reply_info.targeti.inline_version;
2305		if (inline_version == 0) {
2306			/* the reply is supposed to contain inline data */
2307			err = -EINVAL;
2308		} else if (inline_version == CEPH_INLINE_NONE) {
2309			err = -ENODATA;
2310		} else {
2311			err = req->r_reply_info.targeti.inline_len;
2312		}
2313	}
2314	ceph_mdsc_put_request(req);
2315	dout("do_getattr result=%d\n", err);
2316	return err;
2317}
2318
2319
2320/*
2321 * Check inode permissions.  We verify we have a valid value for
2322 * the AUTH cap, then call the generic handler.
2323 */
2324int ceph_permission(struct inode *inode, int mask)
2325{
2326	int err;
2327
2328	if (mask & MAY_NOT_BLOCK)
2329		return -ECHILD;
2330
2331	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2332
2333	if (!err)
2334		err = generic_permission(inode, mask);
2335	return err;
2336}
2337
2338/* Craft a mask of needed caps given a set of requested statx attrs. */
2339static int statx_to_caps(u32 want)
2340{
2341	int mask = 0;
2342
2343	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2344		mask |= CEPH_CAP_AUTH_SHARED;
2345
2346	if (want & (STATX_NLINK|STATX_CTIME))
2347		mask |= CEPH_CAP_LINK_SHARED;
2348
2349	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2350		    STATX_BLOCKS))
2351		mask |= CEPH_CAP_FILE_SHARED;
2352
2353	if (want & (STATX_CTIME))
2354		mask |= CEPH_CAP_XATTR_SHARED;
2355
2356	return mask;
2357}
2358
2359/*
2360 * Get all the attributes. If we have sufficient caps for the requested attrs,
2361 * then we can avoid talking to the MDS at all.
2362 */
2363int ceph_getattr(const struct path *path, struct kstat *stat,
2364		 u32 request_mask, unsigned int flags)
2365{
2366	struct inode *inode = d_inode(path->dentry);
2367	struct ceph_inode_info *ci = ceph_inode(inode);
2368	u32 valid_mask = STATX_BASIC_STATS;
2369	int err = 0;
2370
2371	/* Skip the getattr altogether if we're asked not to sync */
2372	if (!(flags & AT_STATX_DONT_SYNC)) {
2373		err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2374				      flags & AT_STATX_FORCE_SYNC);
2375		if (err)
2376			return err;
2377	}
2378
2379	generic_fillattr(inode, stat);
2380	stat->ino = ceph_present_inode(inode);
2381
2382	/*
2383	 * btime on newly-allocated inodes is 0, so if this is still set to
2384	 * that, then assume that it's not valid.
2385	 */
2386	if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2387		stat->btime = ci->i_btime;
2388		valid_mask |= STATX_BTIME;
2389	}
2390
2391	if (ceph_snap(inode) == CEPH_NOSNAP)
2392		stat->dev = inode->i_sb->s_dev;
2393	else
2394		stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2395
2396	if (S_ISDIR(inode->i_mode)) {
2397		if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2398					RBYTES))
2399			stat->size = ci->i_rbytes;
2400		else
2401			stat->size = ci->i_files + ci->i_subdirs;
2402		stat->blocks = 0;
2403		stat->blksize = 65536;
2404		/*
2405		 * Some applications rely on the number of st_nlink
2406		 * value on directories to be either 0 (if unlinked)
2407		 * or 2 + number of subdirectories.
2408		 */
2409		if (stat->nlink == 1)
2410			/* '.' + '..' + subdirs */
2411			stat->nlink = 1 + 1 + ci->i_subdirs;
2412	}
2413
2414	stat->result_mask = request_mask & valid_mask;
2415	return err;
2416}