1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/ceph/ceph_debug.h>
   3
   4#include <linux/module.h>
   5#include <linux/fs.h>
   6#include <linux/slab.h>
   7#include <linux/string.h>
   8#include <linux/uaccess.h>
   9#include <linux/kernel.h>
 
  10#include <linux/writeback.h>
  11#include <linux/vmalloc.h>
  12#include <linux/xattr.h>
  13#include <linux/posix_acl.h>
  14#include <linux/random.h>
  15#include <linux/sort.h>
  16#include <linux/iversion.h>
  17
  18#include "super.h"
  19#include "mds_client.h"
  20#include "cache.h"
  21#include <linux/ceph/decode.h>
  22
  23/*
  24 * Ceph inode operations
  25 *
  26 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  27 * setattr, etc.), xattr helpers, and helpers for assimilating
  28 * metadata returned by the MDS into our cache.
  29 *
  30 * Also define helpers for doing asynchronous writeback, invalidation,
  31 * and truncation for the benefit of those who can't afford to block
  32 * (typically because they are in the message handler path).
  33 */
  34
  35static const struct inode_operations ceph_symlink_iops;
  36
  37static void ceph_inode_work(struct work_struct *work);
 
 
  38
  39/*
  40 * find or create an inode, given the ceph ino number
  41 */
  42static int ceph_set_ino_cb(struct inode *inode, void *data)
  43{
  44	struct ceph_inode_info *ci = ceph_inode(inode);
  45	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
  46
  47	ci->i_vino = *(struct ceph_vino *)data;
  48	inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
  49	inode_set_iversion_raw(inode, 0);
  50	percpu_counter_inc(&mdsc->metric.total_inodes);
  51
  52	return 0;
  53}
  54
  55struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  56{
  57	struct inode *inode;
 
  58
  59	if (ceph_vino_is_reserved(vino))
  60		return ERR_PTR(-EREMOTEIO);
  61
  62	inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
  63			     ceph_set_ino_cb, &vino);
  64	if (!inode)
  65		return ERR_PTR(-ENOMEM);
 
 
 
 
 
  66
  67	dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
  68	     ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
  69	return inode;
  70}
  71
  72/*
  73 * get/constuct snapdir inode for a given directory
  74 */
  75struct inode *ceph_get_snapdir(struct inode *parent)
  76{
  77	struct ceph_vino vino = {
  78		.ino = ceph_ino(parent),
  79		.snap = CEPH_SNAPDIR,
  80	};
  81	struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  82	struct ceph_inode_info *ci = ceph_inode(inode);
  83
 
  84	if (IS_ERR(inode))
  85		return inode;
  86
  87	if (!S_ISDIR(parent->i_mode)) {
  88		pr_warn_once("bad snapdir parent type (mode=0%o)\n",
  89			     parent->i_mode);
  90		goto err;
  91	}
  92
  93	if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
  94		pr_warn_once("bad snapdir inode type (mode=0%o)\n",
  95			     inode->i_mode);
  96		goto err;
  97	}
  98
  99	inode->i_mode = parent->i_mode;
 100	inode->i_uid = parent->i_uid;
 101	inode->i_gid = parent->i_gid;
 102	inode->i_mtime = parent->i_mtime;
 103	inode->i_ctime = parent->i_ctime;
 104	inode->i_atime = parent->i_atime;
 105	ci->i_rbytes = 0;
 106	ci->i_btime = ceph_inode(parent)->i_btime;
 107
 108	if (inode->i_state & I_NEW) {
 109		inode->i_op = &ceph_snapdir_iops;
 110		inode->i_fop = &ceph_snapdir_fops;
 111		ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 112		unlock_new_inode(inode);
 113	}
 114
 115	return inode;
 116err:
 117	if ((inode->i_state & I_NEW))
 118		discard_new_inode(inode);
 119	else
 120		iput(inode);
 121	return ERR_PTR(-ENOTDIR);
 122}
 123
 124const struct inode_operations ceph_file_iops = {
 125	.permission = ceph_permission,
 126	.setattr = ceph_setattr,
 127	.getattr = ceph_getattr,
 
 
 128	.listxattr = ceph_listxattr,
 129	.get_inode_acl = ceph_get_acl,
 130	.set_acl = ceph_set_acl,
 131};
 132
 133
 134/*
 135 * We use a 'frag tree' to keep track of the MDS's directory fragments
 136 * for a given inode (usually there is just a single fragment).  We
 137 * need to know when a child frag is delegated to a new MDS, or when
 138 * it is flagged as replicated, so we can direct our requests
 139 * accordingly.
 140 */
 141
 142/*
 143 * find/create a frag in the tree
 144 */
 145static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 146						    u32 f)
 147{
 148	struct rb_node **p;
 149	struct rb_node *parent = NULL;
 150	struct ceph_inode_frag *frag;
 151	int c;
 152
 153	p = &ci->i_fragtree.rb_node;
 154	while (*p) {
 155		parent = *p;
 156		frag = rb_entry(parent, struct ceph_inode_frag, node);
 157		c = ceph_frag_compare(f, frag->frag);
 158		if (c < 0)
 159			p = &(*p)->rb_left;
 160		else if (c > 0)
 161			p = &(*p)->rb_right;
 162		else
 163			return frag;
 164	}
 165
 166	frag = kmalloc(sizeof(*frag), GFP_NOFS);
 167	if (!frag)
 
 
 
 168		return ERR_PTR(-ENOMEM);
 169
 170	frag->frag = f;
 171	frag->split_by = 0;
 172	frag->mds = -1;
 173	frag->ndist = 0;
 174
 175	rb_link_node(&frag->node, parent, p);
 176	rb_insert_color(&frag->node, &ci->i_fragtree);
 177
 178	dout("get_or_create_frag added %llx.%llx frag %x\n",
 179	     ceph_vinop(&ci->netfs.inode), f);
 180	return frag;
 181}
 182
 183/*
 184 * find a specific frag @f
 185 */
 186struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 187{
 188	struct rb_node *n = ci->i_fragtree.rb_node;
 189
 190	while (n) {
 191		struct ceph_inode_frag *frag =
 192			rb_entry(n, struct ceph_inode_frag, node);
 193		int c = ceph_frag_compare(f, frag->frag);
 194		if (c < 0)
 195			n = n->rb_left;
 196		else if (c > 0)
 197			n = n->rb_right;
 198		else
 199			return frag;
 200	}
 201	return NULL;
 202}
 203
 204/*
 205 * Choose frag containing the given value @v.  If @pfrag is
 206 * specified, copy the frag delegation info to the caller if
 207 * it is present.
 208 */
 209static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 210			      struct ceph_inode_frag *pfrag, int *found)
 
 211{
 212	u32 t = ceph_frag_make(0, 0);
 213	struct ceph_inode_frag *frag;
 214	unsigned nway, i;
 215	u32 n;
 216
 217	if (found)
 218		*found = 0;
 219
 
 220	while (1) {
 221		WARN_ON(!ceph_frag_contains_value(t, v));
 222		frag = __ceph_find_frag(ci, t);
 223		if (!frag)
 224			break; /* t is a leaf */
 225		if (frag->split_by == 0) {
 226			if (pfrag)
 227				memcpy(pfrag, frag, sizeof(*pfrag));
 228			if (found)
 229				*found = 1;
 230			break;
 231		}
 232
 233		/* choose child */
 234		nway = 1 << frag->split_by;
 235		dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 236		     frag->split_by, nway);
 237		for (i = 0; i < nway; i++) {
 238			n = ceph_frag_make_child(t, frag->split_by, i);
 239			if (ceph_frag_contains_value(n, v)) {
 240				t = n;
 241				break;
 242			}
 243		}
 244		BUG_ON(i == nway);
 245	}
 246	dout("choose_frag(%x) = %x\n", v, t);
 247
 248	return t;
 249}
 250
 251u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 252		     struct ceph_inode_frag *pfrag, int *found)
 253{
 254	u32 ret;
 255	mutex_lock(&ci->i_fragtree_mutex);
 256	ret = __ceph_choose_frag(ci, v, pfrag, found);
 257	mutex_unlock(&ci->i_fragtree_mutex);
 258	return ret;
 259}
 260
 261/*
 262 * Process dirfrag (delegation) info from the mds.  Include leaf
 263 * fragment in tree ONLY if ndist > 0.  Otherwise, only
 264 * branches/splits are included in i_fragtree)
 265 */
 266static int ceph_fill_dirfrag(struct inode *inode,
 267			     struct ceph_mds_reply_dirfrag *dirinfo)
 268{
 269	struct ceph_inode_info *ci = ceph_inode(inode);
 270	struct ceph_inode_frag *frag;
 271	u32 id = le32_to_cpu(dirinfo->frag);
 272	int mds = le32_to_cpu(dirinfo->auth);
 273	int ndist = le32_to_cpu(dirinfo->ndist);
 274	int diri_auth = -1;
 275	int i;
 276	int err = 0;
 277
 278	spin_lock(&ci->i_ceph_lock);
 279	if (ci->i_auth_cap)
 280		diri_auth = ci->i_auth_cap->mds;
 281	spin_unlock(&ci->i_ceph_lock);
 282
 283	if (mds == -1) /* CDIR_AUTH_PARENT */
 284		mds = diri_auth;
 285
 286	mutex_lock(&ci->i_fragtree_mutex);
 287	if (ndist == 0 && mds == diri_auth) {
 288		/* no delegation info needed. */
 289		frag = __ceph_find_frag(ci, id);
 290		if (!frag)
 291			goto out;
 292		if (frag->split_by == 0) {
 293			/* tree leaf, remove */
 294			dout("fill_dirfrag removed %llx.%llx frag %x"
 295			     " (no ref)\n", ceph_vinop(inode), id);
 296			rb_erase(&frag->node, &ci->i_fragtree);
 297			kfree(frag);
 298		} else {
 299			/* tree branch, keep and clear */
 300			dout("fill_dirfrag cleared %llx.%llx frag %x"
 301			     " referral\n", ceph_vinop(inode), id);
 302			frag->mds = -1;
 303			frag->ndist = 0;
 304		}
 305		goto out;
 306	}
 307
 308
 309	/* find/add this frag to store mds delegation info */
 310	frag = __get_or_create_frag(ci, id);
 311	if (IS_ERR(frag)) {
 312		/* this is not the end of the world; we can continue
 313		   with bad/inaccurate delegation info */
 314		pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 315		       ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 316		err = -ENOMEM;
 317		goto out;
 318	}
 319
 320	frag->mds = mds;
 321	frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 322	for (i = 0; i < frag->ndist; i++)
 323		frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 324	dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 325	     ceph_vinop(inode), frag->frag, frag->ndist);
 326
 327out:
 328	mutex_unlock(&ci->i_fragtree_mutex);
 329	return err;
 330}
 331
 332static int frag_tree_split_cmp(const void *l, const void *r)
 333{
 334	struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 335	struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 336	return ceph_frag_compare(le32_to_cpu(ls->frag),
 337				 le32_to_cpu(rs->frag));
 338}
 339
 340static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 341{
 342	if (!frag)
 343		return f == ceph_frag_make(0, 0);
 344	if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 345		return false;
 346	return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 347}
 348
 349static int ceph_fill_fragtree(struct inode *inode,
 350			      struct ceph_frag_tree_head *fragtree,
 351			      struct ceph_mds_reply_dirfrag *dirinfo)
 352{
 353	struct ceph_inode_info *ci = ceph_inode(inode);
 354	struct ceph_inode_frag *frag, *prev_frag = NULL;
 355	struct rb_node *rb_node;
 356	unsigned i, split_by, nsplits;
 357	u32 id;
 358	bool update = false;
 359
 360	mutex_lock(&ci->i_fragtree_mutex);
 361	nsplits = le32_to_cpu(fragtree->nsplits);
 362	if (nsplits != ci->i_fragtree_nsplits) {
 363		update = true;
 364	} else if (nsplits) {
 365		i = get_random_u32_below(nsplits);
 366		id = le32_to_cpu(fragtree->splits[i].frag);
 367		if (!__ceph_find_frag(ci, id))
 368			update = true;
 369	} else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 370		rb_node = rb_first(&ci->i_fragtree);
 371		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 372		if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 373			update = true;
 374	}
 375	if (!update && dirinfo) {
 376		id = le32_to_cpu(dirinfo->frag);
 377		if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 378			update = true;
 379	}
 380	if (!update)
 381		goto out_unlock;
 382
 383	if (nsplits > 1) {
 384		sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 385		     frag_tree_split_cmp, NULL);
 386	}
 387
 388	dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 389	rb_node = rb_first(&ci->i_fragtree);
 390	for (i = 0; i < nsplits; i++) {
 391		id = le32_to_cpu(fragtree->splits[i].frag);
 392		split_by = le32_to_cpu(fragtree->splits[i].by);
 393		if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 394			pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 395			       "frag %x split by %d\n", ceph_vinop(inode),
 396			       i, nsplits, id, split_by);
 397			continue;
 398		}
 399		frag = NULL;
 400		while (rb_node) {
 401			frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 402			if (ceph_frag_compare(frag->frag, id) >= 0) {
 403				if (frag->frag != id)
 404					frag = NULL;
 405				else
 406					rb_node = rb_next(rb_node);
 407				break;
 408			}
 409			rb_node = rb_next(rb_node);
 410			/* delete stale split/leaf node */
 411			if (frag->split_by > 0 ||
 412			    !is_frag_child(frag->frag, prev_frag)) {
 413				rb_erase(&frag->node, &ci->i_fragtree);
 414				if (frag->split_by > 0)
 415					ci->i_fragtree_nsplits--;
 416				kfree(frag);
 417			}
 418			frag = NULL;
 419		}
 420		if (!frag) {
 421			frag = __get_or_create_frag(ci, id);
 422			if (IS_ERR(frag))
 423				continue;
 424		}
 425		if (frag->split_by == 0)
 426			ci->i_fragtree_nsplits++;
 427		frag->split_by = split_by;
 428		dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 429		prev_frag = frag;
 430	}
 431	while (rb_node) {
 432		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 433		rb_node = rb_next(rb_node);
 434		/* delete stale split/leaf node */
 435		if (frag->split_by > 0 ||
 436		    !is_frag_child(frag->frag, prev_frag)) {
 437			rb_erase(&frag->node, &ci->i_fragtree);
 438			if (frag->split_by > 0)
 439				ci->i_fragtree_nsplits--;
 440			kfree(frag);
 441		}
 442	}
 443out_unlock:
 444	mutex_unlock(&ci->i_fragtree_mutex);
 445	return 0;
 446}
 447
 448/*
 449 * initialize a newly allocated inode.
 450 */
 451struct inode *ceph_alloc_inode(struct super_block *sb)
 452{
 453	struct ceph_inode_info *ci;
 454	int i;
 455
 456	ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
 457	if (!ci)
 458		return NULL;
 459
 460	dout("alloc_inode %p\n", &ci->netfs.inode);
 461
 462	/* Set parameters for the netfs library */
 463	netfs_inode_init(&ci->netfs, &ceph_netfs_ops);
 464
 465	spin_lock_init(&ci->i_ceph_lock);
 466
 467	ci->i_version = 0;
 468	ci->i_inline_version = 0;
 469	ci->i_time_warp_seq = 0;
 470	ci->i_ceph_flags = 0;
 471	atomic64_set(&ci->i_ordered_count, 1);
 472	atomic64_set(&ci->i_release_count, 1);
 473	atomic64_set(&ci->i_complete_seq[0], 0);
 474	atomic64_set(&ci->i_complete_seq[1], 0);
 475	ci->i_symlink = NULL;
 476
 477	ci->i_max_bytes = 0;
 478	ci->i_max_files = 0;
 479
 480	memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 481	memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 482	RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 483
 484	ci->i_fragtree = RB_ROOT;
 485	mutex_init(&ci->i_fragtree_mutex);
 486
 487	ci->i_xattrs.blob = NULL;
 488	ci->i_xattrs.prealloc_blob = NULL;
 489	ci->i_xattrs.dirty = false;
 490	ci->i_xattrs.index = RB_ROOT;
 491	ci->i_xattrs.count = 0;
 492	ci->i_xattrs.names_size = 0;
 493	ci->i_xattrs.vals_size = 0;
 494	ci->i_xattrs.version = 0;
 495	ci->i_xattrs.index_version = 0;
 496
 497	ci->i_caps = RB_ROOT;
 498	ci->i_auth_cap = NULL;
 499	ci->i_dirty_caps = 0;
 500	ci->i_flushing_caps = 0;
 501	INIT_LIST_HEAD(&ci->i_dirty_item);
 502	INIT_LIST_HEAD(&ci->i_flushing_item);
 503	ci->i_prealloc_cap_flush = NULL;
 504	INIT_LIST_HEAD(&ci->i_cap_flush_list);
 
 505	init_waitqueue_head(&ci->i_cap_wq);
 
 506	ci->i_hold_caps_max = 0;
 507	INIT_LIST_HEAD(&ci->i_cap_delay_list);
 
 
 
 508	INIT_LIST_HEAD(&ci->i_cap_snaps);
 509	ci->i_head_snapc = NULL;
 510	ci->i_snap_caps = 0;
 511
 512	ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 513	for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 514		ci->i_nr_by_mode[i] = 0;
 515
 516	mutex_init(&ci->i_truncate_mutex);
 517	ci->i_truncate_seq = 0;
 518	ci->i_truncate_size = 0;
 519	ci->i_truncate_pending = 0;
 520
 521	ci->i_max_size = 0;
 522	ci->i_reported_size = 0;
 523	ci->i_wanted_max_size = 0;
 524	ci->i_requested_max_size = 0;
 525
 526	ci->i_pin_ref = 0;
 527	ci->i_rd_ref = 0;
 528	ci->i_rdcache_ref = 0;
 529	ci->i_wr_ref = 0;
 530	ci->i_wb_ref = 0;
 531	ci->i_fx_ref = 0;
 532	ci->i_wrbuffer_ref = 0;
 533	ci->i_wrbuffer_ref_head = 0;
 534	atomic_set(&ci->i_filelock_ref, 0);
 535	atomic_set(&ci->i_shared_gen, 1);
 536	ci->i_rdcache_gen = 0;
 537	ci->i_rdcache_revoking = 0;
 538
 
 539	INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 540	INIT_LIST_HEAD(&ci->i_unsafe_iops);
 541	spin_lock_init(&ci->i_unsafe_lock);
 542
 543	ci->i_snap_realm = NULL;
 544	INIT_LIST_HEAD(&ci->i_snap_realm_item);
 545	INIT_LIST_HEAD(&ci->i_snap_flush_item);
 546
 547	INIT_WORK(&ci->i_work, ceph_inode_work);
 548	ci->i_work_mask = 0;
 549	memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 550	return &ci->netfs.inode;
 
 
 551}
 552
 553void ceph_free_inode(struct inode *inode)
 554{
 
 555	struct ceph_inode_info *ci = ceph_inode(inode);
 556
 557	kfree(ci->i_symlink);
 558	kmem_cache_free(ceph_inode_cachep, ci);
 559}
 560
 561void ceph_evict_inode(struct inode *inode)
 562{
 563	struct ceph_inode_info *ci = ceph_inode(inode);
 564	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 565	struct ceph_inode_frag *frag;
 566	struct rb_node *n;
 567
 568	dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 569
 570	percpu_counter_dec(&mdsc->metric.total_inodes);
 571
 572	truncate_inode_pages_final(&inode->i_data);
 573	if (inode->i_state & I_PINNING_FSCACHE_WB)
 574		ceph_fscache_unuse_cookie(inode, true);
 575	clear_inode(inode);
 576
 577	ceph_fscache_unregister_inode_cookie(ci);
 578
 579	__ceph_remove_caps(ci);
 580
 581	if (__ceph_has_quota(ci, QUOTA_GET_ANY))
 582		ceph_adjust_quota_realms_count(inode, false);
 583
 584	/*
 585	 * we may still have a snap_realm reference if there are stray
 586	 * caps in i_snap_caps.
 587	 */
 588	if (ci->i_snap_realm) {
 589		if (ceph_snap(inode) == CEPH_NOSNAP) {
 590			dout(" dropping residual ref to snap realm %p\n",
 591			     ci->i_snap_realm);
 592			ceph_change_snap_realm(inode, NULL);
 593		} else {
 594			ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 595			ci->i_snap_realm = NULL;
 596		}
 
 597	}
 598
 
 599	while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 600		frag = rb_entry(n, struct ceph_inode_frag, node);
 601		rb_erase(n, &ci->i_fragtree);
 602		kfree(frag);
 603	}
 604	ci->i_fragtree_nsplits = 0;
 605
 606	__ceph_destroy_xattrs(ci);
 607	if (ci->i_xattrs.blob)
 608		ceph_buffer_put(ci->i_xattrs.blob);
 609	if (ci->i_xattrs.prealloc_blob)
 610		ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 611
 612	ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 613	ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 614}
 615
 616static inline blkcnt_t calc_inode_blocks(u64 size)
 617{
 618	return (size + (1<<9) - 1) >> 9;
 619}
 620
 621/*
 622 * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 623 * careful because either the client or MDS may have more up to date
 624 * info, depending on which capabilities are held, and whether
 625 * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 626 * and size are monotonically increasing, except when utimes() or
 627 * truncate() increments the corresponding _seq values.)
 628 */
 629int ceph_fill_file_size(struct inode *inode, int issued,
 630			u32 truncate_seq, u64 truncate_size, u64 size)
 631{
 632	struct ceph_inode_info *ci = ceph_inode(inode);
 633	int queue_trunc = 0;
 634	loff_t isize = i_size_read(inode);
 635
 636	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 637	    (truncate_seq == ci->i_truncate_seq && size > isize)) {
 638		dout("size %lld -> %llu\n", isize, size);
 639		if (size > 0 && S_ISDIR(inode->i_mode)) {
 640			pr_err("fill_file_size non-zero size for directory\n");
 641			size = 0;
 642		}
 643		i_size_write(inode, size);
 644		inode->i_blocks = calc_inode_blocks(size);
 645		/*
 646		 * If we're expanding, then we should be able to just update
 647		 * the existing cookie.
 648		 */
 649		if (size > isize)
 650			ceph_fscache_update(inode);
 651		ci->i_reported_size = size;
 652		if (truncate_seq != ci->i_truncate_seq) {
 653			dout("truncate_seq %u -> %u\n",
 654			     ci->i_truncate_seq, truncate_seq);
 655			ci->i_truncate_seq = truncate_seq;
 656
 657			/* the MDS should have revoked these caps */
 658			WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 659					       CEPH_CAP_FILE_RD |
 660					       CEPH_CAP_FILE_WR |
 661					       CEPH_CAP_FILE_LAZYIO));
 662			/*
 663			 * If we hold relevant caps, or in the case where we're
 664			 * not the only client referencing this file and we
 665			 * don't hold those caps, then we need to check whether
 666			 * the file is either opened or mmaped
 667			 */
 668			if ((issued & (CEPH_CAP_FILE_CACHE|
 669				       CEPH_CAP_FILE_BUFFER)) ||
 
 
 670			    mapping_mapped(inode->i_mapping) ||
 671			    __ceph_is_file_opened(ci)) {
 672				ci->i_truncate_pending++;
 673				queue_trunc = 1;
 674			}
 675		}
 676	}
 677	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 678	    ci->i_truncate_size != truncate_size) {
 679		dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 680		     truncate_size);
 681		ci->i_truncate_size = truncate_size;
 682	}
 683	return queue_trunc;
 684}
 685
 686void ceph_fill_file_time(struct inode *inode, int issued,
 687			 u64 time_warp_seq, struct timespec64 *ctime,
 688			 struct timespec64 *mtime, struct timespec64 *atime)
 689{
 690	struct ceph_inode_info *ci = ceph_inode(inode);
 691	int warn = 0;
 692
 693	if (issued & (CEPH_CAP_FILE_EXCL|
 694		      CEPH_CAP_FILE_WR|
 695		      CEPH_CAP_FILE_BUFFER|
 696		      CEPH_CAP_AUTH_EXCL|
 697		      CEPH_CAP_XATTR_EXCL)) {
 698		if (ci->i_version == 0 ||
 699		    timespec64_compare(ctime, &inode->i_ctime) > 0) {
 700			dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 701			     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 702			     ctime->tv_sec, ctime->tv_nsec);
 703			inode->i_ctime = *ctime;
 704		}
 705		if (ci->i_version == 0 ||
 706		    ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 707			/* the MDS did a utimes() */
 708			dout("mtime %lld.%09ld -> %lld.%09ld "
 709			     "tw %d -> %d\n",
 710			     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 711			     mtime->tv_sec, mtime->tv_nsec,
 712			     ci->i_time_warp_seq, (int)time_warp_seq);
 713
 714			inode->i_mtime = *mtime;
 715			inode->i_atime = *atime;
 716			ci->i_time_warp_seq = time_warp_seq;
 717		} else if (time_warp_seq == ci->i_time_warp_seq) {
 718			/* nobody did utimes(); take the max */
 719			if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 720				dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 721				     inode->i_mtime.tv_sec,
 722				     inode->i_mtime.tv_nsec,
 723				     mtime->tv_sec, mtime->tv_nsec);
 724				inode->i_mtime = *mtime;
 725			}
 726			if (timespec64_compare(atime, &inode->i_atime) > 0) {
 727				dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 728				     inode->i_atime.tv_sec,
 729				     inode->i_atime.tv_nsec,
 730				     atime->tv_sec, atime->tv_nsec);
 731				inode->i_atime = *atime;
 732			}
 733		} else if (issued & CEPH_CAP_FILE_EXCL) {
 734			/* we did a utimes(); ignore mds values */
 735		} else {
 736			warn = 1;
 737		}
 738	} else {
 739		/* we have no write|excl caps; whatever the MDS says is true */
 740		if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 741			inode->i_ctime = *ctime;
 742			inode->i_mtime = *mtime;
 743			inode->i_atime = *atime;
 744			ci->i_time_warp_seq = time_warp_seq;
 745		} else {
 746			warn = 1;
 747		}
 748	}
 749	if (warn) /* time_warp_seq shouldn't go backwards */
 750		dout("%p mds time_warp_seq %llu < %u\n",
 751		     inode, time_warp_seq, ci->i_time_warp_seq);
 752}
 753
 754/*
 755 * Populate an inode based on info from mds.  May be called on new or
 756 * existing inodes.
 757 */
 758int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 759		    struct ceph_mds_reply_info_in *iinfo,
 760		    struct ceph_mds_reply_dirfrag *dirinfo,
 761		    struct ceph_mds_session *session, int cap_fmode,
 762		    struct ceph_cap_reservation *caps_reservation)
 
 763{
 764	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 765	struct ceph_mds_reply_inode *info = iinfo->in;
 766	struct ceph_inode_info *ci = ceph_inode(inode);
 767	int issued, new_issued, info_caps;
 768	struct timespec64 mtime, atime, ctime;
 
 
 
 769	struct ceph_buffer *xattr_blob = NULL;
 770	struct ceph_buffer *old_blob = NULL;
 771	struct ceph_string *pool_ns = NULL;
 772	struct ceph_cap *new_cap = NULL;
 773	int err = 0;
 774	bool wake = false;
 775	bool queue_trunc = false;
 776	bool new_version = false;
 777	bool fill_inline = false;
 778	umode_t mode = le32_to_cpu(info->mode);
 779	dev_t rdev = le32_to_cpu(info->rdev);
 780
 781	lockdep_assert_held(&mdsc->snap_rwsem);
 782
 783	dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
 784	     inode, ceph_vinop(inode), le64_to_cpu(info->version),
 785	     ci->i_version);
 786
 787	/* Once I_NEW is cleared, we can't change type or dev numbers */
 788	if (inode->i_state & I_NEW) {
 789		inode->i_mode = mode;
 790	} else {
 791		if (inode_wrong_type(inode, mode)) {
 792			pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 793				     ceph_vinop(inode), inode->i_mode, mode);
 794			return -ESTALE;
 795		}
 796
 797		if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 798			pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 799				     ceph_vinop(inode), MAJOR(inode->i_rdev),
 800				     MINOR(inode->i_rdev), MAJOR(rdev),
 801				     MINOR(rdev));
 802			return -ESTALE;
 803		}
 804	}
 805
 806	info_caps = le32_to_cpu(info->cap.caps);
 807
 808	/* prealloc new cap struct */
 809	if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 810		new_cap = ceph_get_cap(mdsc, caps_reservation);
 811		if (!new_cap)
 812			return -ENOMEM;
 813	}
 814
 815	/*
 816	 * prealloc xattr data, if it looks like we'll need it.  only
 817	 * if len > 4 (meaning there are actually xattrs; the first 4
 818	 * bytes are the xattr count).
 819	 */
 820	if (iinfo->xattr_len > 4) {
 821		xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 822		if (!xattr_blob)
 823			pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
 824			       iinfo->xattr_len);
 825	}
 826
 827	if (iinfo->pool_ns_len > 0)
 828		pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 829						     iinfo->pool_ns_len);
 830
 831	if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 832		ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 833
 834	spin_lock(&ci->i_ceph_lock);
 835
 836	/*
 837	 * provided version will be odd if inode value is projected,
 838	 * even if stable.  skip the update if we have newer stable
 839	 * info (ours>=theirs, e.g. due to racing mds replies), unless
 840	 * we are getting projected (unstable) info (in which case the
 841	 * version is odd, and we want ours>theirs).
 842	 *   us   them
 843	 *   2    2     skip
 844	 *   3    2     skip
 845	 *   3    3     update
 846	 */
 847	if (ci->i_version == 0 ||
 848	    ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 849	     le64_to_cpu(info->version) > (ci->i_version & ~1)))
 850		new_version = true;
 851
 852	/* Update change_attribute */
 853	inode_set_max_iversion_raw(inode, iinfo->change_attr);
 854
 855	__ceph_caps_issued(ci, &issued);
 856	issued |= __ceph_caps_dirty(ci);
 857	new_issued = ~issued & info_caps;
 858
 859	/* directories have fl_stripe_unit set to zero */
 860	if (le32_to_cpu(info->layout.fl_stripe_unit))
 861		inode->i_blkbits =
 862			fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 863	else
 864		inode->i_blkbits = CEPH_BLOCK_SHIFT;
 865
 866	__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 867
 868	if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 869	    (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 870		inode->i_mode = mode;
 871		inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 872		inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 873		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 874		     from_kuid(&init_user_ns, inode->i_uid),
 875		     from_kgid(&init_user_ns, inode->i_gid));
 876		ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
 877		ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 878	}
 879
 880	if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 881	    (issued & CEPH_CAP_LINK_EXCL) == 0)
 882		set_nlink(inode, le32_to_cpu(info->nlink));
 883
 884	if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 885		/* be careful with mtime, atime, size */
 886		ceph_decode_timespec64(&atime, &info->atime);
 887		ceph_decode_timespec64(&mtime, &info->mtime);
 888		ceph_decode_timespec64(&ctime, &info->ctime);
 889		ceph_fill_file_time(inode, issued,
 890				le32_to_cpu(info->time_warp_seq),
 891				&ctime, &mtime, &atime);
 892	}
 893
 894	if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 895		ci->i_files = le64_to_cpu(info->files);
 896		ci->i_subdirs = le64_to_cpu(info->subdirs);
 897	}
 898
 899	if (new_version ||
 900	    (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 901		s64 old_pool = ci->i_layout.pool_id;
 902		struct ceph_string *old_ns;
 903
 904		ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 905		old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 906					lockdep_is_held(&ci->i_ceph_lock));
 907		rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 908
 909		if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 910			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 911
 912		pool_ns = old_ns;
 913
 914		queue_trunc = ceph_fill_file_size(inode, issued,
 915					le32_to_cpu(info->truncate_seq),
 916					le64_to_cpu(info->truncate_size),
 917					le64_to_cpu(info->size));
 918		/* only update max_size on auth cap */
 919		if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 920		    ci->i_max_size != le64_to_cpu(info->max_size)) {
 921			dout("max_size %lld -> %llu\n", ci->i_max_size,
 922					le64_to_cpu(info->max_size));
 923			ci->i_max_size = le64_to_cpu(info->max_size);
 924		}
 925	}
 926
 927	/* layout and rstat are not tracked by capability, update them if
 928	 * the inode info is from auth mds */
 929	if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 930		if (S_ISDIR(inode->i_mode)) {
 931			ci->i_dir_layout = iinfo->dir_layout;
 932			ci->i_rbytes = le64_to_cpu(info->rbytes);
 933			ci->i_rfiles = le64_to_cpu(info->rfiles);
 934			ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 935			ci->i_dir_pin = iinfo->dir_pin;
 936			ci->i_rsnaps = iinfo->rsnaps;
 937			ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 938		}
 939	}
 940
 941	/* xattrs */
 942	/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 943	if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 944	    le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 945		if (ci->i_xattrs.blob)
 946			old_blob = ci->i_xattrs.blob;
 947		ci->i_xattrs.blob = xattr_blob;
 948		if (xattr_blob)
 949			memcpy(ci->i_xattrs.blob->vec.iov_base,
 950			       iinfo->xattr_data, iinfo->xattr_len);
 951		ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 952		ceph_forget_all_cached_acls(inode);
 953		ceph_security_invalidate_secctx(inode);
 954		xattr_blob = NULL;
 955	}
 956
 957	/* finally update i_version */
 958	if (le64_to_cpu(info->version) > ci->i_version)
 959		ci->i_version = le64_to_cpu(info->version);
 960
 961	inode->i_mapping->a_ops = &ceph_aops;
 
 
 962
 963	switch (inode->i_mode & S_IFMT) {
 964	case S_IFIFO:
 965	case S_IFBLK:
 966	case S_IFCHR:
 967	case S_IFSOCK:
 968		inode->i_blkbits = PAGE_SHIFT;
 969		init_special_inode(inode, inode->i_mode, rdev);
 970		inode->i_op = &ceph_file_iops;
 971		break;
 972	case S_IFREG:
 973		inode->i_op = &ceph_file_iops;
 974		inode->i_fop = &ceph_file_fops;
 975		break;
 976	case S_IFLNK:
 977		inode->i_op = &ceph_symlink_iops;
 978		if (!ci->i_symlink) {
 979			u32 symlen = iinfo->symlink_len;
 980			char *sym;
 981
 982			spin_unlock(&ci->i_ceph_lock);
 983
 984			if (symlen != i_size_read(inode)) {
 985				pr_err("%s %llx.%llx BAD symlink "
 986					"size %lld\n", __func__,
 987					ceph_vinop(inode),
 988					i_size_read(inode));
 989				i_size_write(inode, symlen);
 990				inode->i_blocks = calc_inode_blocks(symlen);
 991			}
 992
 993			err = -ENOMEM;
 994			sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 995			if (!sym)
 996				goto out;
 
 
 997
 998			spin_lock(&ci->i_ceph_lock);
 999			if (!ci->i_symlink)
1000				ci->i_symlink = sym;
1001			else
1002				kfree(sym); /* lost a race */
1003		}
1004		inode->i_link = ci->i_symlink;
1005		break;
1006	case S_IFDIR:
1007		inode->i_op = &ceph_dir_iops;
1008		inode->i_fop = &ceph_dir_fops;
 
 
 
 
 
 
 
 
 
1009		break;
1010	default:
1011		pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
1012		       ceph_vinop(inode), inode->i_mode);
1013	}
1014
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1015	/* were we issued a capability? */
1016	if (info_caps) {
1017		if (ceph_snap(inode) == CEPH_NOSNAP) {
1018			ceph_add_cap(inode, session,
1019				     le64_to_cpu(info->cap.cap_id),
1020				     info_caps,
 
1021				     le32_to_cpu(info->cap.wanted),
1022				     le32_to_cpu(info->cap.seq),
1023				     le32_to_cpu(info->cap.mseq),
1024				     le64_to_cpu(info->cap.realm),
1025				     info->cap.flags, &new_cap);
1026
1027			/* set dir completion flag? */
1028			if (S_ISDIR(inode->i_mode) &&
1029			    ci->i_files == 0 && ci->i_subdirs == 0 &&
1030			    (info_caps & CEPH_CAP_FILE_SHARED) &&
1031			    (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1032			    !__ceph_dir_is_complete(ci)) {
1033				dout(" marking %p complete (empty)\n", inode);
1034				i_size_write(inode, 0);
1035				__ceph_dir_set_complete(ci,
1036					atomic64_read(&ci->i_release_count),
1037					atomic64_read(&ci->i_ordered_count));
1038			}
1039
1040			wake = true;
1041		} else {
 
1042			dout(" %p got snap_caps %s\n", inode,
1043			     ceph_cap_string(info_caps));
1044			ci->i_snap_caps |= info_caps;
1045		}
1046	}
1047
1048	if (iinfo->inline_version > 0 &&
1049	    iinfo->inline_version >= ci->i_inline_version) {
1050		int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1051		ci->i_inline_version = iinfo->inline_version;
1052		if (ceph_has_inline_data(ci) &&
1053		    (locked_page || (info_caps & cache_caps)))
1054			fill_inline = true;
1055	}
1056
1057	if (cap_fmode >= 0) {
1058		if (!info_caps)
1059			pr_warn("mds issued no caps on %llx.%llx\n",
1060				ceph_vinop(inode));
1061		__ceph_touch_fmode(ci, mdsc, cap_fmode);
 
 
 
 
1062	}
1063
1064	spin_unlock(&ci->i_ceph_lock);
1065
1066	ceph_fscache_register_inode_cookie(inode);
1067
1068	if (fill_inline)
1069		ceph_fill_inline_data(inode, locked_page,
1070				      iinfo->inline_data, iinfo->inline_len);
1071
1072	if (wake)
1073		wake_up_all(&ci->i_cap_wq);
1074
1075	/* queue truncate if we saw i_size decrease */
1076	if (queue_trunc)
1077		ceph_queue_vmtruncate(inode);
1078
1079	/* populate frag tree */
1080	if (S_ISDIR(inode->i_mode))
1081		ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1082
1083	/* update delegation info? */
1084	if (dirinfo)
1085		ceph_fill_dirfrag(inode, dirinfo);
1086
1087	err = 0;
 
1088out:
1089	if (new_cap)
1090		ceph_put_cap(mdsc, new_cap);
1091	ceph_buffer_put(old_blob);
1092	ceph_buffer_put(xattr_blob);
1093	ceph_put_string(pool_ns);
1094	return err;
1095}
1096
1097/*
1098 * caller should hold session s_mutex and dentry->d_lock.
1099 */
1100static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1101				  struct ceph_mds_reply_lease *lease,
1102				  struct ceph_mds_session *session,
1103				  unsigned long from_time,
1104				  struct ceph_mds_session **old_lease_session)
1105{
1106	struct ceph_dentry_info *di = ceph_dentry(dentry);
1107	unsigned mask = le16_to_cpu(lease->mask);
1108	long unsigned duration = le32_to_cpu(lease->duration_ms);
1109	long unsigned ttl = from_time + (duration * HZ) / 1000;
1110	long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 
1111
 
 
 
 
 
1112	dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1113	     dentry, duration, ttl);
1114
1115	/* only track leases on regular dentries */
1116	if (ceph_snap(dir) != CEPH_NOSNAP)
1117		return;
1118
1119	if (mask & CEPH_LEASE_PRIMARY_LINK)
1120		di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1121	else
1122		di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1123
1124	di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1125	if (!(mask & CEPH_LEASE_VALID)) {
1126		__ceph_dentry_dir_lease_touch(di);
1127		return;
1128	}
1129
1130	if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1131	    time_before(ttl, di->time))
1132		return;  /* we already have a newer lease. */
1133
1134	if (di->lease_session && di->lease_session != session) {
1135		*old_lease_session = di->lease_session;
1136		di->lease_session = NULL;
1137	}
1138
1139	if (!di->lease_session)
1140		di->lease_session = ceph_get_mds_session(session);
1141	di->lease_gen = atomic_read(&session->s_cap_gen);
1142	di->lease_seq = le32_to_cpu(lease->seq);
1143	di->lease_renew_after = half_ttl;
1144	di->lease_renew_from = 0;
1145	di->time = ttl;
1146
1147	__ceph_dentry_lease_touch(di);
1148}
1149
1150static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1151					struct ceph_mds_reply_lease *lease,
1152					struct ceph_mds_session *session,
1153					unsigned long from_time)
1154{
1155	struct ceph_mds_session *old_lease_session = NULL;
1156	spin_lock(&dentry->d_lock);
1157	__update_dentry_lease(dir, dentry, lease, session, from_time,
1158			      &old_lease_session);
1159	spin_unlock(&dentry->d_lock);
1160	ceph_put_mds_session(old_lease_session);
1161}
1162
1163/*
1164 * update dentry lease without having parent inode locked
 
 
 
1165 */
1166static void update_dentry_lease_careful(struct dentry *dentry,
1167					struct ceph_mds_reply_lease *lease,
1168					struct ceph_mds_session *session,
1169					unsigned long from_time,
1170					char *dname, u32 dname_len,
1171					struct ceph_vino *pdvino,
1172					struct ceph_vino *ptvino)
1173
1174{
1175	struct inode *dir;
1176	struct ceph_mds_session *old_lease_session = NULL;
 
1177
1178	spin_lock(&dentry->d_lock);
1179	/* make sure dentry's name matches target */
1180	if (dentry->d_name.len != dname_len ||
1181	    memcmp(dentry->d_name.name, dname, dname_len))
1182		goto out_unlock;
1183
1184	dir = d_inode(dentry->d_parent);
1185	/* make sure parent matches dvino */
1186	if (!ceph_ino_compare(dir, pdvino))
1187		goto out_unlock;
1188
1189	/* make sure dentry's inode matches target. NULL ptvino means that
1190	 * we expect a negative dentry */
1191	if (ptvino) {
1192		if (d_really_is_negative(dentry))
1193			goto out_unlock;
1194		if (!ceph_ino_compare(d_inode(dentry), ptvino))
1195			goto out_unlock;
1196	} else {
1197		if (d_really_is_positive(dentry))
1198			goto out_unlock;
1199	}
 
 
1200
1201	__update_dentry_lease(dir, dentry, lease, session,
1202			      from_time, &old_lease_session);
1203out_unlock:
1204	spin_unlock(&dentry->d_lock);
1205	ceph_put_mds_session(old_lease_session);
 
 
1206}
1207
1208/*
1209 * splice a dentry to an inode.
1210 * caller must hold directory i_rwsem for this to be safe.
 
 
 
 
1211 */
1212static int splice_dentry(struct dentry **pdn, struct inode *in)
 
1213{
1214	struct dentry *dn = *pdn;
1215	struct dentry *realdn;
1216
1217	BUG_ON(d_inode(dn));
1218
1219	if (S_ISDIR(in->i_mode)) {
1220		/* If inode is directory, d_splice_alias() below will remove
1221		 * 'realdn' from its origin parent. We need to ensure that
1222		 * origin parent's readdir cache will not reference 'realdn'
1223		 */
1224		realdn = d_find_any_alias(in);
1225		if (realdn) {
1226			struct ceph_dentry_info *di = ceph_dentry(realdn);
1227			spin_lock(&realdn->d_lock);
1228
1229			realdn->d_op->d_prune(realdn);
1230
1231			di->time = jiffies;
1232			di->lease_shared_gen = 0;
1233			di->offset = 0;
1234
1235			spin_unlock(&realdn->d_lock);
1236			dput(realdn);
1237		}
1238	}
1239
1240	/* dn must be unhashed */
1241	if (!d_unhashed(dn))
1242		d_drop(dn);
1243	realdn = d_splice_alias(in, dn);
1244	if (IS_ERR(realdn)) {
1245		pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1246		       PTR_ERR(realdn), dn, in, ceph_vinop(in));
1247		return PTR_ERR(realdn);
1248	}
1249
1250	if (realdn) {
 
1251		dout("dn %p (%d) spliced with %p (%d) "
1252		     "inode %p ino %llx.%llx\n",
1253		     dn, d_count(dn),
1254		     realdn, d_count(realdn),
1255		     d_inode(realdn), ceph_vinop(d_inode(realdn)));
1256		dput(dn);
1257		*pdn = realdn;
1258	} else {
1259		BUG_ON(!ceph_dentry(dn));
1260		dout("dn %p attached to %p ino %llx.%llx\n",
1261		     dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1262	}
1263	return 0;
 
 
 
 
 
1264}
1265
1266/*
1267 * Incorporate results into the local cache.  This is either just
1268 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1269 * after a lookup).
1270 *
1271 * A reply may contain
1272 *         a directory inode along with a dentry.
1273 *  and/or a target inode
1274 *
1275 * Called with snap_rwsem (read).
1276 */
1277int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
 
1278{
1279	struct ceph_mds_session *session = req->r_session;
1280	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1281	struct inode *in = NULL;
1282	struct ceph_vino tvino, dvino;
 
1283	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 
1284	int err = 0;
1285
1286	dout("fill_trace %p is_dentry %d is_target %d\n", req,
1287	     rinfo->head->is_dentry, rinfo->head->is_target);
1288
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1289	if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1290		dout("fill_trace reply is empty!\n");
1291		if (rinfo->head->result == 0 && req->r_parent)
1292			ceph_invalidate_dir_request(req);
1293		return 0;
1294	}
1295
1296	if (rinfo->head->is_dentry) {
1297		struct inode *dir = req->r_parent;
1298
1299		if (dir) {
1300			err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1301					      rinfo->dirfrag, session, -1,
1302					      &req->r_caps_reservation);
1303			if (err < 0)
1304				goto done;
1305		} else {
1306			WARN_ON_ONCE(1);
1307		}
1308
1309		if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1310		    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1311		    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1312			struct qstr dname;
1313			struct dentry *dn, *parent;
1314
1315			BUG_ON(!rinfo->head->is_target);
1316			BUG_ON(req->r_dentry);
1317
1318			parent = d_find_any_alias(dir);
1319			BUG_ON(!parent);
1320
1321			dname.name = rinfo->dname;
1322			dname.len = rinfo->dname_len;
1323			dname.hash = full_name_hash(parent, dname.name, dname.len);
1324			tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1325			tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1326retry_lookup:
1327			dn = d_lookup(parent, &dname);
1328			dout("d_lookup on parent=%p name=%.*s got %p\n",
1329			     parent, dname.len, dname.name, dn);
1330
1331			if (!dn) {
1332				dn = d_alloc(parent, &dname);
1333				dout("d_alloc %p '%.*s' = %p\n", parent,
1334				     dname.len, dname.name, dn);
1335				if (!dn) {
1336					dput(parent);
1337					err = -ENOMEM;
1338					goto done;
1339				}
1340				err = 0;
1341			} else if (d_really_is_positive(dn) &&
1342				   (ceph_ino(d_inode(dn)) != tvino.ino ||
1343				    ceph_snap(d_inode(dn)) != tvino.snap)) {
1344				dout(" dn %p points to wrong inode %p\n",
1345				     dn, d_inode(dn));
1346				ceph_dir_clear_ordered(dir);
1347				d_delete(dn);
1348				dput(dn);
1349				goto retry_lookup;
1350			}
1351
1352			req->r_dentry = dn;
1353			dput(parent);
1354		}
1355	}
1356
1357	if (rinfo->head->is_target) {
1358		/* Should be filled in by handle_reply */
1359		BUG_ON(!req->r_target_inode);
1360
1361		in = req->r_target_inode;
1362		err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1363				NULL, session,
1364				(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1365				 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1366				 rinfo->head->result == 0) ?  req->r_fmode : -1,
1367				&req->r_caps_reservation);
1368		if (err < 0) {
1369			pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1370				in, ceph_vinop(in));
1371			req->r_target_inode = NULL;
1372			if (in->i_state & I_NEW)
1373				discard_new_inode(in);
1374			else
1375				iput(in);
1376			goto done;
1377		}
1378		if (in->i_state & I_NEW)
1379			unlock_new_inode(in);
1380	}
1381
1382	/*
1383	 * ignore null lease/binding on snapdir ENOENT, or else we
1384	 * will have trouble splicing in the virtual snapdir later
1385	 */
1386	if (rinfo->head->is_dentry &&
1387            !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1388	    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1389	    (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1390					       fsc->mount_options->snapdir_name,
1391					       req->r_dentry->d_name.len))) {
1392		/*
1393		 * lookup link rename   : null -> possibly existing inode
1394		 * mknod symlink mkdir  : null -> new inode
1395		 * unlink               : linked -> null
1396		 */
1397		struct inode *dir = req->r_parent;
1398		struct dentry *dn = req->r_dentry;
1399		bool have_dir_cap, have_lease;
1400
1401		BUG_ON(!dn);
1402		BUG_ON(!dir);
1403		BUG_ON(d_inode(dn->d_parent) != dir);
1404
1405		dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1406		dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1407
1408		BUG_ON(ceph_ino(dir) != dvino.ino);
1409		BUG_ON(ceph_snap(dir) != dvino.snap);
1410
1411		/* do we have a lease on the whole dir? */
1412		have_dir_cap =
1413			(le32_to_cpu(rinfo->diri.in->cap.caps) &
1414			 CEPH_CAP_FILE_SHARED);
1415
1416		/* do we have a dn lease? */
1417		have_lease = have_dir_cap ||
1418			le32_to_cpu(rinfo->dlease->duration_ms);
1419		if (!have_lease)
1420			dout("fill_trace  no dentry lease or dir cap\n");
1421
1422		/* rename? */
1423		if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1424			struct inode *olddir = req->r_old_dentry_dir;
1425			BUG_ON(!olddir);
1426
1427			dout(" src %p '%pd' dst %p '%pd'\n",
1428			     req->r_old_dentry,
1429			     req->r_old_dentry,
1430			     dn, dn);
 
 
1431			dout("fill_trace doing d_move %p -> %p\n",
1432			     req->r_old_dentry, dn);
1433
1434			/* d_move screws up sibling dentries' offsets */
1435			ceph_dir_clear_ordered(dir);
1436			ceph_dir_clear_ordered(olddir);
1437
1438			d_move(req->r_old_dentry, dn);
1439			dout(" src %p '%pd' dst %p '%pd'\n",
1440			     req->r_old_dentry,
1441			     req->r_old_dentry,
1442			     dn, dn);
 
 
1443
1444			/* ensure target dentry is invalidated, despite
1445			   rehashing bug in vfs_rename_dir */
1446			ceph_invalidate_dentry_lease(dn);
1447
1448			dout("dn %p gets new offset %lld\n", req->r_old_dentry,
 
 
 
 
 
 
 
1449			     ceph_dentry(req->r_old_dentry)->offset);
1450
1451			/* swap r_dentry and r_old_dentry in case that
1452			 * splice_dentry() gets called later. This is safe
1453			 * because no other place will use them */
1454			req->r_dentry = req->r_old_dentry;
1455			req->r_old_dentry = dn;
1456			dn = req->r_dentry;
1457		}
1458
1459		/* null dentry? */
1460		if (!rinfo->head->is_target) {
1461			dout("fill_trace null dentry\n");
1462			if (d_really_is_positive(dn)) {
1463				dout("d_delete %p\n", dn);
1464				ceph_dir_clear_ordered(dir);
1465				d_delete(dn);
1466			} else if (have_lease) {
1467				if (d_unhashed(dn))
1468					d_add(dn, NULL);
1469			}
1470
1471			if (!d_unhashed(dn) && have_lease)
1472				update_dentry_lease(dir, dn,
1473						    rinfo->dlease, session,
1474						    req->r_request_started);
 
1475			goto done;
1476		}
1477
1478		/* attach proper inode */
1479		if (d_really_is_negative(dn)) {
1480			ceph_dir_clear_ordered(dir);
1481			ihold(in);
1482			err = splice_dentry(&req->r_dentry, in);
1483			if (err < 0)
 
 
 
 
 
 
 
 
 
 
 
1484				goto done;
1485			dn = req->r_dentry;  /* may have spliced */
1486		} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
 
 
 
 
 
1487			dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1488			     dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1489			     ceph_vinop(in));
1490			d_invalidate(dn);
1491			have_lease = false;
 
1492		}
1493
1494		if (have_lease) {
1495			update_dentry_lease(dir, dn,
1496					    rinfo->dlease, session,
1497					    req->r_request_started);
1498		}
1499		dout(" final dn %p\n", dn);
1500	} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1501		    req->r_op == CEPH_MDS_OP_MKSNAP) &&
1502	           test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1503		   !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1504		struct inode *dir = req->r_parent;
1505
1506		/* fill out a snapdir LOOKUPSNAP dentry */
1507		BUG_ON(!dir);
1508		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1509		BUG_ON(!req->r_dentry);
1510		dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1511		ceph_dir_clear_ordered(dir);
1512		ihold(in);
1513		err = splice_dentry(&req->r_dentry, in);
1514		if (err < 0)
 
 
 
 
1515			goto done;
1516	} else if (rinfo->head->is_dentry && req->r_dentry) {
1517		/* parent inode is not locked, be carefull */
1518		struct ceph_vino *ptvino = NULL;
1519		dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1520		dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1521		if (rinfo->head->is_target) {
1522			tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1523			tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1524			ptvino = &tvino;
1525		}
1526		update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1527					    session, req->r_request_started,
1528					    rinfo->dname, rinfo->dname_len,
1529					    &dvino, ptvino);
1530	}
1531done:
1532	dout("fill_trace done err=%d\n", err);
1533	return err;
1534}
1535
1536/*
1537 * Prepopulate our cache with readdir results, leases, etc.
1538 */
1539static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1540					   struct ceph_mds_session *session)
1541{
1542	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1543	int i, err = 0;
1544
1545	for (i = 0; i < rinfo->dir_nr; i++) {
1546		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1547		struct ceph_vino vino;
1548		struct inode *in;
1549		int rc;
1550
1551		vino.ino = le64_to_cpu(rde->inode.in->ino);
1552		vino.snap = le64_to_cpu(rde->inode.in->snapid);
1553
1554		in = ceph_get_inode(req->r_dentry->d_sb, vino);
1555		if (IS_ERR(in)) {
1556			err = PTR_ERR(in);
1557			dout("new_inode badness got %d\n", err);
1558			continue;
1559		}
1560		rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1561				     -1, &req->r_caps_reservation);
1562		if (rc < 0) {
1563			pr_err("ceph_fill_inode badness on %p got %d\n",
1564			       in, rc);
1565			err = rc;
1566			if (in->i_state & I_NEW) {
1567				ihold(in);
1568				discard_new_inode(in);
1569			}
1570		} else if (in->i_state & I_NEW) {
1571			unlock_new_inode(in);
1572		}
 
1573
1574		iput(in);
 
 
 
 
 
 
 
 
 
 
1575	}
1576
 
 
1577	return err;
1578}
1579
1580void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1581{
1582	if (ctl->page) {
1583		kunmap(ctl->page);
1584		put_page(ctl->page);
1585		ctl->page = NULL;
1586	}
1587}
1588
1589static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1590			      struct ceph_readdir_cache_control *ctl,
1591			      struct ceph_mds_request *req)
1592{
1593	struct ceph_inode_info *ci = ceph_inode(dir);
1594	unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1595	unsigned idx = ctl->index % nsize;
1596	pgoff_t pgoff = ctl->index / nsize;
1597
1598	if (!ctl->page || pgoff != page_index(ctl->page)) {
1599		ceph_readdir_cache_release(ctl);
1600		if (idx == 0)
1601			ctl->page = grab_cache_page(&dir->i_data, pgoff);
1602		else
1603			ctl->page = find_lock_page(&dir->i_data, pgoff);
1604		if (!ctl->page) {
1605			ctl->index = -1;
1606			return idx == 0 ? -ENOMEM : 0;
1607		}
1608		/* reading/filling the cache are serialized by
1609		 * i_rwsem, no need to use page lock */
1610		unlock_page(ctl->page);
1611		ctl->dentries = kmap(ctl->page);
1612		if (idx == 0)
1613			memset(ctl->dentries, 0, PAGE_SIZE);
1614	}
1615
1616	if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1617	    req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1618		dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1619		ctl->dentries[idx] = dn;
1620		ctl->index++;
1621	} else {
1622		dout("disable readdir cache\n");
1623		ctl->index = -1;
1624	}
1625	return 0;
1626}
1627
1628int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1629			     struct ceph_mds_session *session)
1630{
1631	struct dentry *parent = req->r_dentry;
1632	struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1633	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1634	struct qstr dname;
1635	struct dentry *dn;
1636	struct inode *in;
1637	int err = 0, skipped = 0, ret, i;
1638	u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1639	u32 last_hash = 0;
1640	u32 fpos_offset;
1641	struct ceph_readdir_cache_control cache_ctl = {};
1642
1643	if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1644		return readdir_prepopulate_inodes_only(req, session);
1645
1646	if (rinfo->hash_order) {
1647		if (req->r_path2) {
1648			last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1649						  req->r_path2,
1650						  strlen(req->r_path2));
1651			last_hash = ceph_frag_value(last_hash);
1652		} else if (rinfo->offset_hash) {
1653			/* mds understands offset_hash */
1654			WARN_ON_ONCE(req->r_readdir_offset != 2);
1655			last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1656		}
1657	}
1658
1659	if (rinfo->dir_dir &&
1660	    le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1661		dout("readdir_prepopulate got new frag %x -> %x\n",
1662		     frag, le32_to_cpu(rinfo->dir_dir->frag));
1663		frag = le32_to_cpu(rinfo->dir_dir->frag);
1664		if (!rinfo->hash_order)
1665			req->r_readdir_offset = 2;
1666	}
1667
1668	if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
 
 
1669		dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1670		     rinfo->dir_nr, parent);
1671	} else {
1672		dout("readdir_prepopulate %d items under dn %p\n",
1673		     rinfo->dir_nr, parent);
1674		if (rinfo->dir_dir)
1675			ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1676
1677		if (ceph_frag_is_leftmost(frag) &&
1678		    req->r_readdir_offset == 2 &&
1679		    !(rinfo->hash_order && last_hash)) {
1680			/* note dir version at start of readdir so we can
1681			 * tell if any dentries get dropped */
1682			req->r_dir_release_cnt =
1683				atomic64_read(&ci->i_release_count);
1684			req->r_dir_ordered_cnt =
1685				atomic64_read(&ci->i_ordered_count);
1686			req->r_readdir_cache_idx = 0;
1687		}
1688	}
1689
1690	cache_ctl.index = req->r_readdir_cache_idx;
1691	fpos_offset = req->r_readdir_offset;
1692
1693	/* FIXME: release caps/leases if error occurs */
1694	for (i = 0; i < rinfo->dir_nr; i++) {
1695		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1696		struct ceph_vino tvino;
1697
1698		dname.name = rde->name;
1699		dname.len = rde->name_len;
1700		dname.hash = full_name_hash(parent, dname.name, dname.len);
1701
1702		tvino.ino = le64_to_cpu(rde->inode.in->ino);
1703		tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1704
1705		if (rinfo->hash_order) {
1706			u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1707						 rde->name, rde->name_len);
1708			hash = ceph_frag_value(hash);
1709			if (hash != last_hash)
1710				fpos_offset = 2;
1711			last_hash = hash;
1712			rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1713		} else {
1714			rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1715		}
1716
1717retry_lookup:
1718		dn = d_lookup(parent, &dname);
1719		dout("d_lookup on parent=%p name=%.*s got %p\n",
1720		     parent, dname.len, dname.name, dn);
1721
1722		if (!dn) {
1723			dn = d_alloc(parent, &dname);
1724			dout("d_alloc %p '%.*s' = %p\n", parent,
1725			     dname.len, dname.name, dn);
1726			if (!dn) {
1727				dout("d_alloc badness\n");
1728				err = -ENOMEM;
1729				goto out;
1730			}
1731		} else if (d_really_is_positive(dn) &&
1732			   (ceph_ino(d_inode(dn)) != tvino.ino ||
1733			    ceph_snap(d_inode(dn)) != tvino.snap)) {
1734			struct ceph_dentry_info *di = ceph_dentry(dn);
1735			dout(" dn %p points to wrong inode %p\n",
1736			     dn, d_inode(dn));
1737
1738			spin_lock(&dn->d_lock);
1739			if (di->offset > 0 &&
1740			    di->lease_shared_gen ==
1741			    atomic_read(&ci->i_shared_gen)) {
1742				__ceph_dir_clear_ordered(ci);
1743				di->offset = 0;
1744			}
1745			spin_unlock(&dn->d_lock);
1746
 
 
 
1747			d_delete(dn);
1748			dput(dn);
1749			goto retry_lookup;
 
 
 
 
 
 
 
1750		}
1751
 
 
 
1752		/* inode */
1753		if (d_really_is_positive(dn)) {
1754			in = d_inode(dn);
1755		} else {
1756			in = ceph_get_inode(parent->d_sb, tvino);
1757			if (IS_ERR(in)) {
1758				dout("new_inode badness\n");
1759				d_drop(dn);
1760				dput(dn);
1761				err = PTR_ERR(in);
1762				goto out;
1763			}
 
 
 
1764		}
1765
1766		ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1767				      -1, &req->r_caps_reservation);
1768		if (ret < 0) {
1769			pr_err("ceph_fill_inode badness on %p\n", in);
1770			if (d_really_is_negative(dn)) {
1771				if (in->i_state & I_NEW) {
1772					ihold(in);
1773					discard_new_inode(in);
1774				}
1775				iput(in);
1776			}
1777			d_drop(dn);
1778			err = ret;
1779			goto next_item;
1780		}
1781		if (in->i_state & I_NEW)
1782			unlock_new_inode(in);
1783
1784		if (d_really_is_negative(dn)) {
1785			if (ceph_security_xattr_deadlock(in)) {
1786				dout(" skip splicing dn %p to inode %p"
1787				     " (security xattr deadlock)\n", dn, in);
1788				iput(in);
1789				skipped++;
1790				goto next_item;
1791			}
1792
1793			err = splice_dentry(&dn, in);
1794			if (err < 0)
1795				goto next_item;
1796		}
1797
1798		ceph_dentry(dn)->offset = rde->offset;
1799
1800		update_dentry_lease(d_inode(parent), dn,
1801				    rde->lease, req->r_session,
1802				    req->r_request_started);
1803
1804		if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1805			ret = fill_readdir_cache(d_inode(parent), dn,
1806						 &cache_ctl, req);
1807			if (ret < 0)
1808				err = ret;
1809		}
1810next_item:
1811		dput(dn);
 
1812	}
 
 
1813out:
1814	if (err == 0 && skipped == 0) {
1815		set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1816		req->r_readdir_cache_idx = cache_ctl.index;
1817	}
1818	ceph_readdir_cache_release(&cache_ctl);
1819	dout("readdir_prepopulate done\n");
1820	return err;
1821}
1822
1823bool ceph_inode_set_size(struct inode *inode, loff_t size)
1824{
1825	struct ceph_inode_info *ci = ceph_inode(inode);
1826	bool ret;
1827
1828	spin_lock(&ci->i_ceph_lock);
1829	dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
1830	i_size_write(inode, size);
1831	ceph_fscache_update(inode);
1832	inode->i_blocks = calc_inode_blocks(size);
1833
1834	ret = __ceph_should_report_size(ci);
1835
1836	spin_unlock(&ci->i_ceph_lock);
1837
 
1838	return ret;
1839}
1840
1841void ceph_queue_inode_work(struct inode *inode, int work_bit)
 
 
 
 
1842{
1843	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1844	struct ceph_inode_info *ci = ceph_inode(inode);
1845	set_bit(work_bit, &ci->i_work_mask);
 
 
 
 
 
1846
1847	ihold(inode);
1848	if (queue_work(fsc->inode_wq, &ci->i_work)) {
1849		dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1850	} else {
1851		dout("queue_inode_work %p already queued, mask=%lx\n",
1852		     inode, ci->i_work_mask);
1853		iput(inode);
1854	}
1855}
1856
1857static void ceph_do_invalidate_pages(struct inode *inode)
 
 
 
 
1858{
1859	struct ceph_inode_info *ci = ceph_inode(inode);
1860	u32 orig_gen;
1861	int check = 0;
1862
1863	ceph_fscache_invalidate(inode, false);
 
 
 
 
 
 
1864
1865	mutex_lock(&ci->i_truncate_mutex);
 
1866
1867	if (ceph_inode_is_shutdown(inode)) {
1868		pr_warn_ratelimited("%s: inode %llx.%llx is shut down\n",
1869				    __func__, ceph_vinop(inode));
1870		mapping_set_error(inode->i_mapping, -EIO);
1871		truncate_pagecache(inode, 0);
1872		mutex_unlock(&ci->i_truncate_mutex);
1873		goto out;
 
 
 
 
 
 
 
 
 
 
 
 
1874	}
 
1875
1876	spin_lock(&ci->i_ceph_lock);
 
 
 
 
 
 
 
 
 
 
 
 
1877	dout("invalidate_pages %p gen %d revoking %d\n", inode,
1878	     ci->i_rdcache_gen, ci->i_rdcache_revoking);
1879	if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1880		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1881			check = 1;
1882		spin_unlock(&ci->i_ceph_lock);
1883		mutex_unlock(&ci->i_truncate_mutex);
1884		goto out;
1885	}
1886	orig_gen = ci->i_rdcache_gen;
1887	spin_unlock(&ci->i_ceph_lock);
1888
1889	if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1890		pr_err("invalidate_inode_pages2 %llx.%llx failed\n",
1891		       ceph_vinop(inode));
1892	}
1893
1894	spin_lock(&ci->i_ceph_lock);
1895	if (orig_gen == ci->i_rdcache_gen &&
1896	    orig_gen == ci->i_rdcache_revoking) {
1897		dout("invalidate_pages %p gen %d successful\n", inode,
1898		     ci->i_rdcache_gen);
1899		ci->i_rdcache_revoking--;
1900		check = 1;
1901	} else {
1902		dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1903		     inode, orig_gen, ci->i_rdcache_gen,
1904		     ci->i_rdcache_revoking);
1905		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1906			check = 1;
1907	}
1908	spin_unlock(&ci->i_ceph_lock);
1909	mutex_unlock(&ci->i_truncate_mutex);
1910out:
1911	if (check)
1912		ceph_check_caps(ci, 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1913}
1914
1915/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1916 * Make sure any pending truncation is applied before doing anything
1917 * that may depend on it.
1918 */
1919void __ceph_do_pending_vmtruncate(struct inode *inode)
1920{
1921	struct ceph_inode_info *ci = ceph_inode(inode);
1922	u64 to;
1923	int wrbuffer_refs, finish = 0;
1924
1925	mutex_lock(&ci->i_truncate_mutex);
1926retry:
1927	spin_lock(&ci->i_ceph_lock);
1928	if (ci->i_truncate_pending == 0) {
1929		dout("__do_pending_vmtruncate %p none pending\n", inode);
1930		spin_unlock(&ci->i_ceph_lock);
1931		mutex_unlock(&ci->i_truncate_mutex);
1932		return;
1933	}
1934
1935	/*
1936	 * make sure any dirty snapped pages are flushed before we
1937	 * possibly truncate them.. so write AND block!
1938	 */
1939	if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1940		spin_unlock(&ci->i_ceph_lock);
1941		dout("__do_pending_vmtruncate %p flushing snaps first\n",
1942		     inode);
 
1943		filemap_write_and_wait_range(&inode->i_data, 0,
1944					     inode->i_sb->s_maxbytes);
1945		goto retry;
1946	}
1947
1948	/* there should be no reader or writer */
1949	WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1950
1951	to = ci->i_truncate_size;
1952	wrbuffer_refs = ci->i_wrbuffer_ref;
1953	dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1954	     ci->i_truncate_pending, to);
1955	spin_unlock(&ci->i_ceph_lock);
1956
1957	ceph_fscache_resize(inode, to);
1958	truncate_pagecache(inode, to);
1959
1960	spin_lock(&ci->i_ceph_lock);
1961	if (to == ci->i_truncate_size) {
1962		ci->i_truncate_pending = 0;
1963		finish = 1;
1964	}
1965	spin_unlock(&ci->i_ceph_lock);
1966	if (!finish)
1967		goto retry;
1968
1969	mutex_unlock(&ci->i_truncate_mutex);
1970
1971	if (wrbuffer_refs == 0)
1972		ceph_check_caps(ci, 0);
1973
1974	wake_up_all(&ci->i_cap_wq);
1975}
1976
1977static void ceph_inode_work(struct work_struct *work)
1978{
1979	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1980						 i_work);
1981	struct inode *inode = &ci->netfs.inode;
1982
1983	if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1984		dout("writeback %p\n", inode);
1985		filemap_fdatawrite(&inode->i_data);
1986	}
1987	if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1988		ceph_do_invalidate_pages(inode);
1989
1990	if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1991		__ceph_do_pending_vmtruncate(inode);
1992
1993	if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
1994		ceph_check_caps(ci, 0);
1995
1996	if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
1997		ceph_flush_snaps(ci, NULL);
1998
1999	iput(inode);
2000}
2001
2002/*
2003 * symlinks
2004 */
 
 
 
 
 
 
 
2005static const struct inode_operations ceph_symlink_iops = {
2006	.get_link = simple_get_link,
2007	.setattr = ceph_setattr,
2008	.getattr = ceph_getattr,
2009	.listxattr = ceph_listxattr,
2010};
2011
2012int __ceph_setattr(struct inode *inode, struct iattr *attr)
 
 
 
2013{
 
2014	struct ceph_inode_info *ci = ceph_inode(inode);
2015	unsigned int ia_valid = attr->ia_valid;
 
2016	struct ceph_mds_request *req;
2017	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2018	struct ceph_cap_flush *prealloc_cf;
2019	int issued;
2020	int release = 0, dirtied = 0;
2021	int mask = 0;
2022	int err = 0;
2023	int inode_dirty_flags = 0;
2024	bool lock_snap_rwsem = false;
2025
2026	prealloc_cf = ceph_alloc_cap_flush();
2027	if (!prealloc_cf)
2028		return -ENOMEM;
 
 
 
 
 
2029
2030	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2031				       USE_AUTH_MDS);
2032	if (IS_ERR(req)) {
2033		ceph_free_cap_flush(prealloc_cf);
2034		return PTR_ERR(req);
2035	}
2036
2037	spin_lock(&ci->i_ceph_lock);
2038	issued = __ceph_caps_issued(ci, NULL);
2039
2040	if (!ci->i_head_snapc &&
2041	    (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2042		lock_snap_rwsem = true;
2043		if (!down_read_trylock(&mdsc->snap_rwsem)) {
2044			spin_unlock(&ci->i_ceph_lock);
2045			down_read(&mdsc->snap_rwsem);
2046			spin_lock(&ci->i_ceph_lock);
2047			issued = __ceph_caps_issued(ci, NULL);
2048		}
2049	}
2050
2051	dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2052
2053	if (ia_valid & ATTR_UID) {
2054		dout("setattr %p uid %d -> %d\n", inode,
2055		     from_kuid(&init_user_ns, inode->i_uid),
2056		     from_kuid(&init_user_ns, attr->ia_uid));
2057		if (issued & CEPH_CAP_AUTH_EXCL) {
2058			inode->i_uid = attr->ia_uid;
2059			dirtied |= CEPH_CAP_AUTH_EXCL;
2060		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2061			   !uid_eq(attr->ia_uid, inode->i_uid)) {
2062			req->r_args.setattr.uid = cpu_to_le32(
2063				from_kuid(&init_user_ns, attr->ia_uid));
2064			mask |= CEPH_SETATTR_UID;
2065			release |= CEPH_CAP_AUTH_SHARED;
2066		}
2067	}
2068	if (ia_valid & ATTR_GID) {
2069		dout("setattr %p gid %d -> %d\n", inode,
2070		     from_kgid(&init_user_ns, inode->i_gid),
2071		     from_kgid(&init_user_ns, attr->ia_gid));
2072		if (issued & CEPH_CAP_AUTH_EXCL) {
2073			inode->i_gid = attr->ia_gid;
2074			dirtied |= CEPH_CAP_AUTH_EXCL;
2075		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2076			   !gid_eq(attr->ia_gid, inode->i_gid)) {
2077			req->r_args.setattr.gid = cpu_to_le32(
2078				from_kgid(&init_user_ns, attr->ia_gid));
2079			mask |= CEPH_SETATTR_GID;
2080			release |= CEPH_CAP_AUTH_SHARED;
2081		}
2082	}
2083	if (ia_valid & ATTR_MODE) {
2084		dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2085		     attr->ia_mode);
2086		if (issued & CEPH_CAP_AUTH_EXCL) {
2087			inode->i_mode = attr->ia_mode;
2088			dirtied |= CEPH_CAP_AUTH_EXCL;
2089		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2090			   attr->ia_mode != inode->i_mode) {
2091			inode->i_mode = attr->ia_mode;
2092			req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2093			mask |= CEPH_SETATTR_MODE;
2094			release |= CEPH_CAP_AUTH_SHARED;
2095		}
2096	}
2097
2098	if (ia_valid & ATTR_ATIME) {
2099		dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2100		     inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2101		     attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2102		if (issued & CEPH_CAP_FILE_EXCL) {
2103			ci->i_time_warp_seq++;
2104			inode->i_atime = attr->ia_atime;
2105			dirtied |= CEPH_CAP_FILE_EXCL;
2106		} else if ((issued & CEPH_CAP_FILE_WR) &&
2107			   timespec64_compare(&inode->i_atime,
2108					    &attr->ia_atime) < 0) {
2109			inode->i_atime = attr->ia_atime;
2110			dirtied |= CEPH_CAP_FILE_WR;
2111		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2112			   !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2113			ceph_encode_timespec64(&req->r_args.setattr.atime,
2114					       &attr->ia_atime);
2115			mask |= CEPH_SETATTR_ATIME;
2116			release |= CEPH_CAP_FILE_SHARED |
2117				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2118		}
2119	}
2120	if (ia_valid & ATTR_SIZE) {
2121		loff_t isize = i_size_read(inode);
2122
2123		dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
2124		if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2125			if (attr->ia_size > isize) {
2126				i_size_write(inode, attr->ia_size);
2127				inode->i_blocks = calc_inode_blocks(attr->ia_size);
2128				ci->i_reported_size = attr->ia_size;
2129				dirtied |= CEPH_CAP_FILE_EXCL;
2130				ia_valid |= ATTR_MTIME;
2131			}
2132		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2133			   attr->ia_size != isize) {
2134			req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2135			req->r_args.setattr.old_size = cpu_to_le64(isize);
2136			mask |= CEPH_SETATTR_SIZE;
2137			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2138				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2139		}
2140	}
2141	if (ia_valid & ATTR_MTIME) {
2142		dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2143		     inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2144		     attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2145		if (issued & CEPH_CAP_FILE_EXCL) {
2146			ci->i_time_warp_seq++;
2147			inode->i_mtime = attr->ia_mtime;
2148			dirtied |= CEPH_CAP_FILE_EXCL;
2149		} else if ((issued & CEPH_CAP_FILE_WR) &&
2150			   timespec64_compare(&inode->i_mtime,
2151					    &attr->ia_mtime) < 0) {
2152			inode->i_mtime = attr->ia_mtime;
2153			dirtied |= CEPH_CAP_FILE_WR;
2154		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2155			   !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2156			ceph_encode_timespec64(&req->r_args.setattr.mtime,
2157					       &attr->ia_mtime);
2158			mask |= CEPH_SETATTR_MTIME;
2159			release |= CEPH_CAP_FILE_SHARED |
2160				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2161		}
2162	}
2163
2164	/* these do nothing */
2165	if (ia_valid & ATTR_CTIME) {
2166		bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2167					 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2168		dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2169		     inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2170		     attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2171		     only ? "ctime only" : "ignored");
 
2172		if (only) {
2173			/*
2174			 * if kernel wants to dirty ctime but nothing else,
2175			 * we need to choose a cap to dirty under, or do
2176			 * a almost-no-op setattr
2177			 */
2178			if (issued & CEPH_CAP_AUTH_EXCL)
2179				dirtied |= CEPH_CAP_AUTH_EXCL;
2180			else if (issued & CEPH_CAP_FILE_EXCL)
2181				dirtied |= CEPH_CAP_FILE_EXCL;
2182			else if (issued & CEPH_CAP_XATTR_EXCL)
2183				dirtied |= CEPH_CAP_XATTR_EXCL;
2184			else
2185				mask |= CEPH_SETATTR_CTIME;
2186		}
2187	}
2188	if (ia_valid & ATTR_FILE)
2189		dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2190
2191	if (dirtied) {
2192		inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2193							   &prealloc_cf);
2194		inode->i_ctime = attr->ia_ctime;
2195		inode_inc_iversion_raw(inode);
2196	}
2197
2198	release &= issued;
2199	spin_unlock(&ci->i_ceph_lock);
2200	if (lock_snap_rwsem)
2201		up_read(&mdsc->snap_rwsem);
2202
2203	if (inode_dirty_flags)
2204		__mark_inode_dirty(inode, inode_dirty_flags);
2205
2206	if (mask) {
2207		req->r_inode = inode;
2208		ihold(inode);
2209		req->r_inode_drop = release;
2210		req->r_args.setattr.mask = cpu_to_le32(mask);
2211		req->r_num_caps = 1;
2212		req->r_stamp = attr->ia_ctime;
2213		err = ceph_mdsc_do_request(mdsc, NULL, req);
 
2214	}
2215	dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2216	     ceph_cap_string(dirtied), mask);
2217
2218	ceph_mdsc_put_request(req);
2219	ceph_free_cap_flush(prealloc_cf);
2220
2221	if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2222		__ceph_do_pending_vmtruncate(inode);
2223
2224	return err;
2225}
2226
2227/*
2228 * setattr
2229 */
2230int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
2231		 struct iattr *attr)
2232{
2233	struct inode *inode = d_inode(dentry);
2234	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2235	int err;
2236
2237	if (ceph_snap(inode) != CEPH_NOSNAP)
2238		return -EROFS;
2239
2240	if (ceph_inode_is_shutdown(inode))
2241		return -ESTALE;
2242
2243	err = setattr_prepare(&init_user_ns, dentry, attr);
2244	if (err != 0)
2245		return err;
2246
2247	if ((attr->ia_valid & ATTR_SIZE) &&
2248	    attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2249		return -EFBIG;
2250
2251	if ((attr->ia_valid & ATTR_SIZE) &&
2252	    ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2253		return -EDQUOT;
2254
2255	err = __ceph_setattr(inode, attr);
2256
2257	if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2258		err = posix_acl_chmod(&init_user_ns, dentry, attr->ia_mode);
2259
2260	return err;
2261}
2262
2263int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2264{
2265	int issued = ceph_caps_issued(ceph_inode(inode));
2266
2267	/*
2268	 * If any 'x' caps is issued we can just choose the auth MDS
2269	 * instead of the random replica MDSes. Because only when the
2270	 * Locker is in LOCK_EXEC state will the loner client could
2271	 * get the 'x' caps. And if we send the getattr requests to
2272	 * any replica MDS it must auth pin and tries to rdlock from
2273	 * the auth MDS, and then the auth MDS need to do the Locker
2274	 * state transition to LOCK_SYNC. And after that the lock state
2275	 * will change back.
2276	 *
2277	 * This cost much when doing the Locker state transition and
2278	 * usually will need to revoke caps from clients.
2279	 *
2280	 * And for the 'Xs' caps for getxattr we will also choose the
2281	 * auth MDS, because the MDS side code is buggy due to setxattr
2282	 * won't notify the replica MDSes when the values changed and
2283	 * the replica MDS will return the old values. Though we will
2284	 * fix it in MDS code, but this still makes sense for old ceph.
2285	 */
2286	if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2287	    || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2288		return USE_AUTH_MDS;
2289	else
2290		return USE_ANY_MDS;
2291}
2292
2293/*
2294 * Verify that we have a lease on the given mask.  If not,
2295 * do a getattr against an mds.
2296 */
2297int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2298		      int mask, bool force)
2299{
2300	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2301	struct ceph_mds_client *mdsc = fsc->mdsc;
2302	struct ceph_mds_request *req;
2303	int mode;
2304	int err;
2305
2306	if (ceph_snap(inode) == CEPH_SNAPDIR) {
2307		dout("do_getattr inode %p SNAPDIR\n", inode);
2308		return 0;
2309	}
2310
2311	dout("do_getattr inode %p mask %s mode 0%o\n",
2312	     inode, ceph_cap_string(mask), inode->i_mode);
2313	if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2314			return 0;
2315
2316	mode = ceph_try_to_choose_auth_mds(inode, mask);
2317	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2318	if (IS_ERR(req))
2319		return PTR_ERR(req);
2320	req->r_inode = inode;
2321	ihold(inode);
2322	req->r_num_caps = 1;
2323	req->r_args.getattr.mask = cpu_to_le32(mask);
2324	req->r_locked_page = locked_page;
2325	err = ceph_mdsc_do_request(mdsc, NULL, req);
2326	if (locked_page && err == 0) {
2327		u64 inline_version = req->r_reply_info.targeti.inline_version;
2328		if (inline_version == 0) {
2329			/* the reply is supposed to contain inline data */
2330			err = -EINVAL;
2331		} else if (inline_version == CEPH_INLINE_NONE ||
2332			   inline_version == 1) {
2333			err = -ENODATA;
2334		} else {
2335			err = req->r_reply_info.targeti.inline_len;
2336		}
2337	}
2338	ceph_mdsc_put_request(req);
2339	dout("do_getattr result=%d\n", err);
2340	return err;
2341}
2342
2343int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2344		      size_t size)
2345{
2346	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2347	struct ceph_mds_client *mdsc = fsc->mdsc;
2348	struct ceph_mds_request *req;
2349	int mode = USE_AUTH_MDS;
2350	int err;
2351	char *xattr_value;
2352	size_t xattr_value_len;
2353
2354	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2355	if (IS_ERR(req)) {
2356		err = -ENOMEM;
2357		goto out;
2358	}
2359
2360	req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2361	req->r_path2 = kstrdup(name, GFP_NOFS);
2362	if (!req->r_path2) {
2363		err = -ENOMEM;
2364		goto put;
2365	}
2366
2367	ihold(inode);
2368	req->r_inode = inode;
2369	err = ceph_mdsc_do_request(mdsc, NULL, req);
2370	if (err < 0)
2371		goto put;
2372
2373	xattr_value = req->r_reply_info.xattr_info.xattr_value;
2374	xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2375
2376	dout("do_getvxattr xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2377
2378	err = (int)xattr_value_len;
2379	if (size == 0)
2380		goto put;
2381
2382	if (xattr_value_len > size) {
2383		err = -ERANGE;
2384		goto put;
2385	}
2386
2387	memcpy(value, xattr_value, xattr_value_len);
2388put:
2389	ceph_mdsc_put_request(req);
2390out:
2391	dout("do_getvxattr result=%d\n", err);
2392	return err;
2393}
2394
2395
2396/*
2397 * Check inode permissions.  We verify we have a valid value for
2398 * the AUTH cap, then call the generic handler.
2399 */
2400int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
2401		    int mask)
2402{
2403	int err;
2404
2405	if (mask & MAY_NOT_BLOCK)
2406		return -ECHILD;
2407
2408	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2409
2410	if (!err)
2411		err = generic_permission(&init_user_ns, inode, mask);
2412	return err;
2413}
2414
2415/* Craft a mask of needed caps given a set of requested statx attrs. */
2416static int statx_to_caps(u32 want, umode_t mode)
2417{
2418	int mask = 0;
2419
2420	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2421		mask |= CEPH_CAP_AUTH_SHARED;
2422
2423	if (want & (STATX_NLINK|STATX_CTIME)) {
2424		/*
2425		 * The link count for directories depends on inode->i_subdirs,
2426		 * and that is only updated when Fs caps are held.
2427		 */
2428		if (S_ISDIR(mode))
2429			mask |= CEPH_CAP_FILE_SHARED;
2430		else
2431			mask |= CEPH_CAP_LINK_SHARED;
2432	}
2433
2434	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2435		    STATX_BLOCKS))
2436		mask |= CEPH_CAP_FILE_SHARED;
2437
2438	if (want & (STATX_CTIME))
2439		mask |= CEPH_CAP_XATTR_SHARED;
2440
2441	return mask;
2442}
2443
2444/*
2445 * Get all the attributes. If we have sufficient caps for the requested attrs,
2446 * then we can avoid talking to the MDS at all.
2447 */
2448int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
2449		 struct kstat *stat, u32 request_mask, unsigned int flags)
2450{
2451	struct inode *inode = d_inode(path->dentry);
2452	struct super_block *sb = inode->i_sb;
2453	struct ceph_inode_info *ci = ceph_inode(inode);
2454	u32 valid_mask = STATX_BASIC_STATS;
2455	int err = 0;
2456
2457	if (ceph_inode_is_shutdown(inode))
2458		return -ESTALE;
2459
2460	/* Skip the getattr altogether if we're asked not to sync */
2461	if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
2462		err = ceph_do_getattr(inode,
2463				statx_to_caps(request_mask, inode->i_mode),
2464				flags & AT_STATX_FORCE_SYNC);
2465		if (err)
2466			return err;
2467	}
2468
2469	generic_fillattr(&init_user_ns, inode, stat);
2470	stat->ino = ceph_present_inode(inode);
2471
2472	/*
2473	 * btime on newly-allocated inodes is 0, so if this is still set to
2474	 * that, then assume that it's not valid.
2475	 */
2476	if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2477		stat->btime = ci->i_btime;
2478		valid_mask |= STATX_BTIME;
2479	}
2480
2481	if (ceph_snap(inode) == CEPH_NOSNAP)
2482		stat->dev = sb->s_dev;
2483	else
2484		stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2485
2486	if (S_ISDIR(inode->i_mode)) {
2487		if (ceph_test_mount_opt(ceph_sb_to_client(sb), RBYTES)) {
2488			stat->size = ci->i_rbytes;
2489		} else if (ceph_snap(inode) == CEPH_SNAPDIR) {
2490			struct ceph_inode_info *pci;
2491			struct ceph_snap_realm *realm;
2492			struct inode *parent;
2493
2494			parent = ceph_lookup_inode(sb, ceph_ino(inode));
2495			if (IS_ERR(parent))
2496				return PTR_ERR(parent);
2497
2498			pci = ceph_inode(parent);
2499			spin_lock(&pci->i_ceph_lock);
2500			realm = pci->i_snap_realm;
2501			if (realm)
2502				stat->size = realm->num_snaps;
2503			else
2504				stat->size = 0;
2505			spin_unlock(&pci->i_ceph_lock);
2506			iput(parent);
2507		} else {
2508			stat->size = ci->i_files + ci->i_subdirs;
2509		}
2510		stat->blocks = 0;
2511		stat->blksize = 65536;
2512		/*
2513		 * Some applications rely on the number of st_nlink
2514		 * value on directories to be either 0 (if unlinked)
2515		 * or 2 + number of subdirectories.
2516		 */
2517		if (stat->nlink == 1)
2518			/* '.' + '..' + subdirs */
2519			stat->nlink = 1 + 1 + ci->i_subdirs;
2520	}
2521
2522	stat->result_mask = request_mask & valid_mask;
2523	return err;
2524}
2525
2526void ceph_inode_shutdown(struct inode *inode)
2527{
2528	struct ceph_inode_info *ci = ceph_inode(inode);
2529	struct rb_node *p;
2530	int iputs = 0;
2531	bool invalidate = false;
2532
2533	spin_lock(&ci->i_ceph_lock);
2534	ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
2535	p = rb_first(&ci->i_caps);
2536	while (p) {
2537		struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
2538
2539		p = rb_next(p);
2540		iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
2541	}
2542	spin_unlock(&ci->i_ceph_lock);
2543
2544	if (invalidate)
2545		ceph_queue_invalidate(inode);
2546	while (iputs--)
2547		iput(inode);
2548}