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