1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * inode.c
   5 *
   6 * vfs' aops, fops, dops and iops
   7 *
   8 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public
  12 * License as published by the Free Software Foundation; either
  13 * version 2 of the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 * General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public
  21 * License along with this program; if not, write to the
  22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 * Boston, MA 021110-1307, USA.
  24 */
  25
  26#include <linux/fs.h>
  27#include <linux/types.h>
  28#include <linux/highmem.h>
  29#include <linux/pagemap.h>
  30#include <linux/quotaops.h>
  31
  32#include <asm/byteorder.h>
  33
  34#include <cluster/masklog.h>
  35
  36#include "ocfs2.h"
  37
  38#include "alloc.h"
  39#include "dir.h"
  40#include "blockcheck.h"
  41#include "dlmglue.h"
  42#include "extent_map.h"
  43#include "file.h"
  44#include "heartbeat.h"
  45#include "inode.h"
  46#include "journal.h"
  47#include "namei.h"
  48#include "suballoc.h"
  49#include "super.h"
  50#include "symlink.h"
  51#include "sysfile.h"
  52#include "uptodate.h"
  53#include "xattr.h"
  54#include "refcounttree.h"
  55#include "ocfs2_trace.h"
  56
  57#include "buffer_head_io.h"
  58
  59struct ocfs2_find_inode_args
  60{
  61	u64		fi_blkno;
  62	unsigned long	fi_ino;
  63	unsigned int	fi_flags;
  64	unsigned int	fi_sysfile_type;
  65};
  66
  67static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];
  68
  69static int ocfs2_read_locked_inode(struct inode *inode,
  70				   struct ocfs2_find_inode_args *args);
  71static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
  72static int ocfs2_find_actor(struct inode *inode, void *opaque);
  73static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
  74				    struct inode *inode,
  75				    struct buffer_head *fe_bh);
  76
  77void ocfs2_set_inode_flags(struct inode *inode)
  78{
  79	unsigned int flags = OCFS2_I(inode)->ip_attr;
  80
  81	inode->i_flags &= ~(S_IMMUTABLE |
  82		S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);
  83
  84	if (flags & OCFS2_IMMUTABLE_FL)
  85		inode->i_flags |= S_IMMUTABLE;
  86
  87	if (flags & OCFS2_SYNC_FL)
  88		inode->i_flags |= S_SYNC;
  89	if (flags & OCFS2_APPEND_FL)
  90		inode->i_flags |= S_APPEND;
  91	if (flags & OCFS2_NOATIME_FL)
  92		inode->i_flags |= S_NOATIME;
  93	if (flags & OCFS2_DIRSYNC_FL)
  94		inode->i_flags |= S_DIRSYNC;
  95}
  96
  97/* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */
  98void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
  99{
 100	unsigned int flags = oi->vfs_inode.i_flags;
 101
 102	oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL|
 103			OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL);
 104	if (flags & S_SYNC)
 105		oi->ip_attr |= OCFS2_SYNC_FL;
 106	if (flags & S_APPEND)
 107		oi->ip_attr |= OCFS2_APPEND_FL;
 108	if (flags & S_IMMUTABLE)
 109		oi->ip_attr |= OCFS2_IMMUTABLE_FL;
 110	if (flags & S_NOATIME)
 111		oi->ip_attr |= OCFS2_NOATIME_FL;
 112	if (flags & S_DIRSYNC)
 113		oi->ip_attr |= OCFS2_DIRSYNC_FL;
 114}
 115
 116struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
 117{
 118	struct ocfs2_find_inode_args args;
 119
 120	args.fi_blkno = blkno;
 121	args.fi_flags = 0;
 122	args.fi_ino = ino_from_blkno(sb, blkno);
 123	args.fi_sysfile_type = 0;
 124
 125	return ilookup5(sb, blkno, ocfs2_find_actor, &args);
 126}
 127struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
 128			 int sysfile_type)
 129{
 130	struct inode *inode = NULL;
 131	struct super_block *sb = osb->sb;
 132	struct ocfs2_find_inode_args args;
 133
 134	trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
 135			       sysfile_type);
 136
 137	/* Ok. By now we've either got the offsets passed to us by the
 138	 * caller, or we just pulled them off the bh. Lets do some
 139	 * sanity checks to make sure they're OK. */
 140	if (blkno == 0) {
 141		inode = ERR_PTR(-EINVAL);
 142		mlog_errno(PTR_ERR(inode));
 143		goto bail;
 144	}
 145
 146	args.fi_blkno = blkno;
 147	args.fi_flags = flags;
 148	args.fi_ino = ino_from_blkno(sb, blkno);
 149	args.fi_sysfile_type = sysfile_type;
 150
 151	inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
 152			     ocfs2_init_locked_inode, &args);
 153	/* inode was *not* in the inode cache. 2.6.x requires
 154	 * us to do our own read_inode call and unlock it
 155	 * afterwards. */
 156	if (inode == NULL) {
 157		inode = ERR_PTR(-ENOMEM);
 158		mlog_errno(PTR_ERR(inode));
 159		goto bail;
 160	}
 161	trace_ocfs2_iget5_locked(inode->i_state);
 162	if (inode->i_state & I_NEW) {
 163		ocfs2_read_locked_inode(inode, &args);
 164		unlock_new_inode(inode);
 165	}
 166	if (is_bad_inode(inode)) {
 167		iput(inode);
 168		inode = ERR_PTR(-ESTALE);
 169		goto bail;
 170	}
 171
 172bail:
 173	if (!IS_ERR(inode)) {
 174		trace_ocfs2_iget_end(inode, 
 175			(unsigned long long)OCFS2_I(inode)->ip_blkno);
 176	}
 177
 178	return inode;
 179}
 180
 181
 182/*
 183 * here's how inodes get read from disk:
 184 * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR
 185 * found? : return the in-memory inode
 186 * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE
 187 */
 188
 189static int ocfs2_find_actor(struct inode *inode, void *opaque)
 190{
 191	struct ocfs2_find_inode_args *args = NULL;
 192	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 193	int ret = 0;
 194
 195	args = opaque;
 196
 197	mlog_bug_on_msg(!inode, "No inode in find actor!\n");
 198
 199	trace_ocfs2_find_actor(inode, inode->i_ino, opaque, args->fi_blkno);
 200
 201	if (oi->ip_blkno != args->fi_blkno)
 202		goto bail;
 203
 204	ret = 1;
 205bail:
 206	return ret;
 207}
 208
 209/*
 210 * initialize the new inode, but don't do anything that would cause
 211 * us to sleep.
 212 * return 0 on success, 1 on failure
 213 */
 214static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
 215{
 216	struct ocfs2_find_inode_args *args = opaque;
 217	static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
 218				     ocfs2_file_ip_alloc_sem_key;
 219
 220	inode->i_ino = args->fi_ino;
 221	OCFS2_I(inode)->ip_blkno = args->fi_blkno;
 222	if (args->fi_sysfile_type != 0)
 223		lockdep_set_class(&inode->i_mutex,
 224			&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
 225	if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
 226	    args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
 227	    args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
 228	    args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
 229		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
 230				  &ocfs2_quota_ip_alloc_sem_key);
 231	else
 232		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
 233				  &ocfs2_file_ip_alloc_sem_key);
 234
 235	return 0;
 236}
 237
 238void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 239			  int create_ino)
 240{
 241	struct super_block *sb;
 242	struct ocfs2_super *osb;
 243	int use_plocks = 1;
 244
 245	sb = inode->i_sb;
 246	osb = OCFS2_SB(sb);
 247
 248	if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
 249	    ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
 250		use_plocks = 0;
 251
 252	/*
 253	 * These have all been checked by ocfs2_read_inode_block() or set
 254	 * by ocfs2_mknod_locked(), so a failure is a code bug.
 255	 */
 256	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));  /* This means that read_inode
 257						cannot create a superblock
 258						inode today.  change if
 259						that is needed. */
 260	BUG_ON(!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)));
 261	BUG_ON(le32_to_cpu(fe->i_fs_generation) != osb->fs_generation);
 262
 263
 264	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 265	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
 266	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
 267
 268	inode->i_version = 1;
 269	inode->i_generation = le32_to_cpu(fe->i_generation);
 270	inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
 271	inode->i_mode = le16_to_cpu(fe->i_mode);
 272	inode->i_uid = le32_to_cpu(fe->i_uid);
 273	inode->i_gid = le32_to_cpu(fe->i_gid);
 274
 275	/* Fast symlinks will have i_size but no allocated clusters. */
 276	if (S_ISLNK(inode->i_mode) && !fe->i_clusters) {
 277		inode->i_blocks = 0;
 278		inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
 279	} else {
 280		inode->i_blocks = ocfs2_inode_sector_count(inode);
 281		inode->i_mapping->a_ops = &ocfs2_aops;
 282	}
 283	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
 284	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
 285	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
 286	inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
 287	inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
 288	inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
 289
 290	if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno))
 291		mlog(ML_ERROR,
 292		     "ip_blkno %llu != i_blkno %llu!\n",
 293		     (unsigned long long)OCFS2_I(inode)->ip_blkno,
 294		     (unsigned long long)le64_to_cpu(fe->i_blkno));
 295
 296	set_nlink(inode, ocfs2_read_links_count(fe));
 297
 298	trace_ocfs2_populate_inode(OCFS2_I(inode)->ip_blkno,
 299				   le32_to_cpu(fe->i_flags));
 300	if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {
 301		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;
 302		inode->i_flags |= S_NOQUOTA;
 303	}
 304  
 305	if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
 306		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
 307	} else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) {
 308		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
 309	} else if (fe->i_flags & cpu_to_le32(OCFS2_QUOTA_FL)) {
 310		inode->i_flags |= S_NOQUOTA;
 311	} else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {
 312		/* we can't actually hit this as read_inode can't
 313		 * handle superblocks today ;-) */
 314		BUG();
 315	}
 316
 317	switch (inode->i_mode & S_IFMT) {
 318	    case S_IFREG:
 319		    if (use_plocks)
 320			    inode->i_fop = &ocfs2_fops;
 321		    else
 322			    inode->i_fop = &ocfs2_fops_no_plocks;
 323		    inode->i_op = &ocfs2_file_iops;
 324		    i_size_write(inode, le64_to_cpu(fe->i_size));
 325		    break;
 326	    case S_IFDIR:
 327		    inode->i_op = &ocfs2_dir_iops;
 328		    if (use_plocks)
 329			    inode->i_fop = &ocfs2_dops;
 330		    else
 331			    inode->i_fop = &ocfs2_dops_no_plocks;
 332		    i_size_write(inode, le64_to_cpu(fe->i_size));
 333		    OCFS2_I(inode)->ip_dir_lock_gen = 1;
 334		    break;
 335	    case S_IFLNK:
 336		    inode->i_op = &ocfs2_symlink_inode_operations;
 
 
 
 337		    i_size_write(inode, le64_to_cpu(fe->i_size));
 338		    break;
 339	    default:
 340		    inode->i_op = &ocfs2_special_file_iops;
 341		    init_special_inode(inode, inode->i_mode,
 342				       inode->i_rdev);
 343		    break;
 344	}
 345
 346	if (create_ino) {
 347		inode->i_ino = ino_from_blkno(inode->i_sb,
 348			       le64_to_cpu(fe->i_blkno));
 349
 350		/*
 351		 * If we ever want to create system files from kernel,
 352		 * the generation argument to
 353		 * ocfs2_inode_lock_res_init() will have to change.
 354		 */
 355		BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL);
 356
 357		ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
 358					  OCFS2_LOCK_TYPE_META, 0, inode);
 359
 360		ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
 361					  OCFS2_LOCK_TYPE_OPEN, 0, inode);
 362	}
 363
 364	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres,
 365				  OCFS2_LOCK_TYPE_RW, inode->i_generation,
 366				  inode);
 367
 368	ocfs2_set_inode_flags(inode);
 369
 370	OCFS2_I(inode)->ip_last_used_slot = 0;
 371	OCFS2_I(inode)->ip_last_used_group = 0;
 372
 373	if (S_ISDIR(inode->i_mode))
 374		ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
 375				    OCFS2_RESV_FLAG_DIR);
 376}
 377
 378static int ocfs2_read_locked_inode(struct inode *inode,
 379				   struct ocfs2_find_inode_args *args)
 380{
 381	struct super_block *sb;
 382	struct ocfs2_super *osb;
 383	struct ocfs2_dinode *fe;
 384	struct buffer_head *bh = NULL;
 385	int status, can_lock;
 386	u32 generation = 0;
 387
 388	status = -EINVAL;
 389	if (inode == NULL || inode->i_sb == NULL) {
 390		mlog(ML_ERROR, "bad inode\n");
 391		return status;
 392	}
 393	sb = inode->i_sb;
 394	osb = OCFS2_SB(sb);
 395
 396	if (!args) {
 397		mlog(ML_ERROR, "bad inode args\n");
 398		make_bad_inode(inode);
 399		return status;
 400	}
 401
 402	/*
 403	 * To improve performance of cold-cache inode stats, we take
 404	 * the cluster lock here if possible.
 405	 *
 406	 * Generally, OCFS2 never trusts the contents of an inode
 407	 * unless it's holding a cluster lock, so taking it here isn't
 408	 * a correctness issue as much as it is a performance
 409	 * improvement.
 410	 *
 411	 * There are three times when taking the lock is not a good idea:
 412	 *
 413	 * 1) During startup, before we have initialized the DLM.
 414	 *
 415	 * 2) If we are reading certain system files which never get
 416	 *    cluster locks (local alloc, truncate log).
 417	 *
 418	 * 3) If the process doing the iget() is responsible for
 419	 *    orphan dir recovery. We're holding the orphan dir lock and
 420	 *    can get into a deadlock with another process on another
 421	 *    node in ->delete_inode().
 422	 *
 423	 * #1 and #2 can be simply solved by never taking the lock
 424	 * here for system files (which are the only type we read
 425	 * during mount). It's a heavier approach, but our main
 426	 * concern is user-accessible files anyway.
 427	 *
 428	 * #3 works itself out because we'll eventually take the
 429	 * cluster lock before trusting anything anyway.
 430	 */
 431	can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
 432		&& !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY)
 433		&& !ocfs2_mount_local(osb);
 434
 435	trace_ocfs2_read_locked_inode(
 436		(unsigned long long)OCFS2_I(inode)->ip_blkno, can_lock);
 437
 438	/*
 439	 * To maintain backwards compatibility with older versions of
 440	 * ocfs2-tools, we still store the generation value for system
 441	 * files. The only ones that actually matter to userspace are
 442	 * the journals, but it's easier and inexpensive to just flag
 443	 * all system files similarly.
 444	 */
 445	if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
 446		generation = osb->fs_generation;
 447
 448	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
 449				  OCFS2_LOCK_TYPE_META,
 450				  generation, inode);
 451
 452	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
 453				  OCFS2_LOCK_TYPE_OPEN,
 454				  0, inode);
 455
 456	if (can_lock) {
 457		status = ocfs2_open_lock(inode);
 458		if (status) {
 459			make_bad_inode(inode);
 460			mlog_errno(status);
 461			return status;
 462		}
 463		status = ocfs2_inode_lock(inode, NULL, 0);
 464		if (status) {
 465			make_bad_inode(inode);
 466			mlog_errno(status);
 467			return status;
 468		}
 469	}
 470
 471	if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) {
 472		status = ocfs2_try_open_lock(inode, 0);
 473		if (status) {
 474			make_bad_inode(inode);
 475			return status;
 476		}
 477	}
 478
 479	if (can_lock) {
 480		status = ocfs2_read_inode_block_full(inode, &bh,
 481						     OCFS2_BH_IGNORE_CACHE);
 482	} else {
 483		status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
 484		/*
 485		 * If buffer is in jbd, then its checksum may not have been
 486		 * computed as yet.
 487		 */
 488		if (!status && !buffer_jbd(bh))
 489			status = ocfs2_validate_inode_block(osb->sb, bh);
 490	}
 491	if (status < 0) {
 492		mlog_errno(status);
 493		goto bail;
 494	}
 495
 496	status = -EINVAL;
 497	fe = (struct ocfs2_dinode *) bh->b_data;
 498
 499	/*
 500	 * This is a code bug. Right now the caller needs to
 501	 * understand whether it is asking for a system file inode or
 502	 * not so the proper lock names can be built.
 503	 */
 504	mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) !=
 505			!!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE),
 506			"Inode %llu: system file state is ambigous\n",
 507			(unsigned long long)args->fi_blkno);
 508
 509	if (S_ISCHR(le16_to_cpu(fe->i_mode)) ||
 510	    S_ISBLK(le16_to_cpu(fe->i_mode)))
 511		inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
 512
 513	ocfs2_populate_inode(inode, fe, 0);
 514
 515	BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));
 516
 517	status = 0;
 518
 519bail:
 520	if (can_lock)
 521		ocfs2_inode_unlock(inode, 0);
 522
 523	if (status < 0)
 524		make_bad_inode(inode);
 525
 526	if (args && bh)
 527		brelse(bh);
 528
 529	return status;
 530}
 531
 532void ocfs2_sync_blockdev(struct super_block *sb)
 533{
 534	sync_blockdev(sb->s_bdev);
 535}
 536
 537static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
 538				     struct inode *inode,
 539				     struct buffer_head *fe_bh)
 540{
 541	int status = 0;
 542	struct ocfs2_dinode *fe;
 543	handle_t *handle = NULL;
 544
 545	fe = (struct ocfs2_dinode *) fe_bh->b_data;
 546
 547	/*
 548	 * This check will also skip truncate of inodes with inline
 549	 * data and fast symlinks.
 550	 */
 551	if (fe->i_clusters) {
 552		if (ocfs2_should_order_data(inode))
 553			ocfs2_begin_ordered_truncate(inode, 0);
 554
 555		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 556		if (IS_ERR(handle)) {
 557			status = PTR_ERR(handle);
 558			handle = NULL;
 559			mlog_errno(status);
 560			goto out;
 561		}
 562
 563		status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 564						 fe_bh,
 565						 OCFS2_JOURNAL_ACCESS_WRITE);
 566		if (status < 0) {
 567			mlog_errno(status);
 568			goto out;
 569		}
 570
 571		i_size_write(inode, 0);
 572
 573		status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 574		if (status < 0) {
 575			mlog_errno(status);
 576			goto out;
 577		}
 578
 579		ocfs2_commit_trans(osb, handle);
 580		handle = NULL;
 581
 582		status = ocfs2_commit_truncate(osb, inode, fe_bh);
 583		if (status < 0) {
 584			mlog_errno(status);
 585			goto out;
 586		}
 587	}
 588
 589out:
 590	if (handle)
 591		ocfs2_commit_trans(osb, handle);
 592	return status;
 593}
 594
 595static int ocfs2_remove_inode(struct inode *inode,
 596			      struct buffer_head *di_bh,
 597			      struct inode *orphan_dir_inode,
 598			      struct buffer_head *orphan_dir_bh)
 599{
 600	int status;
 601	struct inode *inode_alloc_inode = NULL;
 602	struct buffer_head *inode_alloc_bh = NULL;
 603	handle_t *handle;
 604	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 605	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
 606
 607	inode_alloc_inode =
 608		ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
 609					    le16_to_cpu(di->i_suballoc_slot));
 610	if (!inode_alloc_inode) {
 611		status = -EEXIST;
 612		mlog_errno(status);
 613		goto bail;
 614	}
 615
 616	mutex_lock(&inode_alloc_inode->i_mutex);
 617	status = ocfs2_inode_lock(inode_alloc_inode, &inode_alloc_bh, 1);
 618	if (status < 0) {
 619		mutex_unlock(&inode_alloc_inode->i_mutex);
 620
 621		mlog_errno(status);
 622		goto bail;
 623	}
 624
 625	handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +
 626				   ocfs2_quota_trans_credits(inode->i_sb));
 627	if (IS_ERR(handle)) {
 628		status = PTR_ERR(handle);
 629		mlog_errno(status);
 630		goto bail_unlock;
 631	}
 632
 633	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
 634		status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
 635					  orphan_dir_bh);
 636		if (status < 0) {
 637			mlog_errno(status);
 638			goto bail_commit;
 639		}
 640	}
 641
 642	/* set the inodes dtime */
 643	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
 644					 OCFS2_JOURNAL_ACCESS_WRITE);
 645	if (status < 0) {
 646		mlog_errno(status);
 647		goto bail_commit;
 648	}
 649
 650	di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec);
 651	di->i_flags &= cpu_to_le32(~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));
 652	ocfs2_journal_dirty(handle, di_bh);
 653
 654	ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);
 655	dquot_free_inode(inode);
 656
 657	status = ocfs2_free_dinode(handle, inode_alloc_inode,
 658				   inode_alloc_bh, di);
 659	if (status < 0)
 660		mlog_errno(status);
 661
 662bail_commit:
 663	ocfs2_commit_trans(osb, handle);
 664bail_unlock:
 665	ocfs2_inode_unlock(inode_alloc_inode, 1);
 666	mutex_unlock(&inode_alloc_inode->i_mutex);
 667	brelse(inode_alloc_bh);
 668bail:
 669	iput(inode_alloc_inode);
 670
 671	return status;
 672}
 673
 674/*
 675 * Serialize with orphan dir recovery. If the process doing
 676 * recovery on this orphan dir does an iget() with the dir
 677 * i_mutex held, we'll deadlock here. Instead we detect this
 678 * and exit early - recovery will wipe this inode for us.
 679 */
 680static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb,
 681					     int slot)
 682{
 683	int ret = 0;
 684
 685	spin_lock(&osb->osb_lock);
 686	if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) {
 687		ret = -EDEADLK;
 688		goto out;
 689	}
 690	/* This signals to the orphan recovery process that it should
 691	 * wait for us to handle the wipe. */
 692	osb->osb_orphan_wipes[slot]++;
 693out:
 694	spin_unlock(&osb->osb_lock);
 695	trace_ocfs2_check_orphan_recovery_state(slot, ret);
 696	return ret;
 697}
 698
 699static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb,
 700					 int slot)
 701{
 702	spin_lock(&osb->osb_lock);
 703	osb->osb_orphan_wipes[slot]--;
 704	spin_unlock(&osb->osb_lock);
 705
 706	wake_up(&osb->osb_wipe_event);
 707}
 708
 709static int ocfs2_wipe_inode(struct inode *inode,
 710			    struct buffer_head *di_bh)
 711{
 712	int status, orphaned_slot = -1;
 713	struct inode *orphan_dir_inode = NULL;
 714	struct buffer_head *orphan_dir_bh = NULL;
 715	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 716	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
 717
 718	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
 719		orphaned_slot = le16_to_cpu(di->i_orphaned_slot);
 720
 721		status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot);
 722		if (status)
 723			return status;
 724
 725		orphan_dir_inode = ocfs2_get_system_file_inode(osb,
 726							       ORPHAN_DIR_SYSTEM_INODE,
 727							       orphaned_slot);
 728		if (!orphan_dir_inode) {
 729			status = -EEXIST;
 730			mlog_errno(status);
 731			goto bail;
 732		}
 733
 734		/* Lock the orphan dir. The lock will be held for the entire
 735		 * delete_inode operation. We do this now to avoid races with
 736		 * recovery completion on other nodes. */
 737		mutex_lock(&orphan_dir_inode->i_mutex);
 738		status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
 739		if (status < 0) {
 740			mutex_unlock(&orphan_dir_inode->i_mutex);
 741
 742			mlog_errno(status);
 743			goto bail;
 744		}
 745	}
 746
 747	/* we do this while holding the orphan dir lock because we
 748	 * don't want recovery being run from another node to try an
 749	 * inode delete underneath us -- this will result in two nodes
 750	 * truncating the same file! */
 751	status = ocfs2_truncate_for_delete(osb, inode, di_bh);
 752	if (status < 0) {
 753		mlog_errno(status);
 754		goto bail_unlock_dir;
 755	}
 756
 757	/* Remove any dir index tree */
 758	if (S_ISDIR(inode->i_mode)) {
 759		status = ocfs2_dx_dir_truncate(inode, di_bh);
 760		if (status) {
 761			mlog_errno(status);
 762			goto bail_unlock_dir;
 763		}
 764	}
 765
 766	/*Free extended attribute resources associated with this inode.*/
 767	status = ocfs2_xattr_remove(inode, di_bh);
 768	if (status < 0) {
 769		mlog_errno(status);
 770		goto bail_unlock_dir;
 771	}
 772
 773	status = ocfs2_remove_refcount_tree(inode, di_bh);
 774	if (status < 0) {
 775		mlog_errno(status);
 776		goto bail_unlock_dir;
 777	}
 778
 779	status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
 780				    orphan_dir_bh);
 781	if (status < 0)
 782		mlog_errno(status);
 783
 784bail_unlock_dir:
 785	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)
 786		return status;
 787
 788	ocfs2_inode_unlock(orphan_dir_inode, 1);
 789	mutex_unlock(&orphan_dir_inode->i_mutex);
 790	brelse(orphan_dir_bh);
 791bail:
 792	iput(orphan_dir_inode);
 793	ocfs2_signal_wipe_completion(osb, orphaned_slot);
 794
 795	return status;
 796}
 797
 798/* There is a series of simple checks that should be done before a
 799 * trylock is even considered. Encapsulate those in this function. */
 800static int ocfs2_inode_is_valid_to_delete(struct inode *inode)
 801{
 802	int ret = 0;
 803	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 804	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 805
 806	trace_ocfs2_inode_is_valid_to_delete(current, osb->dc_task,
 807					     (unsigned long long)oi->ip_blkno,
 808					     oi->ip_flags);
 809
 810	/* We shouldn't be getting here for the root directory
 811	 * inode.. */
 812	if (inode == osb->root_inode) {
 813		mlog(ML_ERROR, "Skipping delete of root inode.\n");
 814		goto bail;
 815	}
 816
 817	/* If we're coming from downconvert_thread we can't go into our own
 818	 * voting [hello, deadlock city!], so unforuntately we just
 819	 * have to skip deleting this guy. That's OK though because
 820	 * the node who's doing the actual deleting should handle it
 821	 * anyway. */
 822	if (current == osb->dc_task)
 823		goto bail;
 824
 825	spin_lock(&oi->ip_lock);
 826	/* OCFS2 *never* deletes system files. This should technically
 827	 * never get here as system file inodes should always have a
 828	 * positive link count. */
 829	if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
 830		mlog(ML_ERROR, "Skipping delete of system file %llu\n",
 831		     (unsigned long long)oi->ip_blkno);
 832		goto bail_unlock;
 833	}
 834
 835	/* If we have allowd wipe of this inode for another node, it
 836	 * will be marked here so we can safely skip it. Recovery will
 837	 * cleanup any inodes we might inadvertently skip here. */
 838	if (oi->ip_flags & OCFS2_INODE_SKIP_DELETE)
 839		goto bail_unlock;
 840
 841	ret = 1;
 842bail_unlock:
 843	spin_unlock(&oi->ip_lock);
 844bail:
 845	return ret;
 846}
 847
 848/* Query the cluster to determine whether we should wipe an inode from
 849 * disk or not.
 850 *
 851 * Requires the inode to have the cluster lock. */
 852static int ocfs2_query_inode_wipe(struct inode *inode,
 853				  struct buffer_head *di_bh,
 854				  int *wipe)
 855{
 856	int status = 0, reason = 0;
 857	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 858	struct ocfs2_dinode *di;
 859
 860	*wipe = 0;
 861
 862	trace_ocfs2_query_inode_wipe_begin((unsigned long long)oi->ip_blkno,
 863					   inode->i_nlink);
 864
 865	/* While we were waiting for the cluster lock in
 866	 * ocfs2_delete_inode, another node might have asked to delete
 867	 * the inode. Recheck our flags to catch this. */
 868	if (!ocfs2_inode_is_valid_to_delete(inode)) {
 869		reason = 1;
 870		goto bail;
 871	}
 872
 873	/* Now that we have an up to date inode, we can double check
 874	 * the link count. */
 875	if (inode->i_nlink)
 876		goto bail;
 877
 878	/* Do some basic inode verification... */
 879	di = (struct ocfs2_dinode *) di_bh->b_data;
 880	if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL)) &&
 881	    !(oi->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
 882		/*
 883		 * Inodes in the orphan dir must have ORPHANED_FL.  The only
 884		 * inodes that come back out of the orphan dir are reflink
 885		 * targets. A reflink target may be moved out of the orphan
 886		 * dir between the time we scan the directory and the time we
 887		 * process it. This would lead to HAS_REFCOUNT_FL being set but
 888		 * ORPHANED_FL not.
 889		 */
 890		if (di->i_dyn_features & cpu_to_le16(OCFS2_HAS_REFCOUNT_FL)) {
 891			reason = 2;
 892			goto bail;
 893		}
 894
 895		/* for lack of a better error? */
 896		status = -EEXIST;
 897		mlog(ML_ERROR,
 898		     "Inode %llu (on-disk %llu) not orphaned! "
 899		     "Disk flags  0x%x, inode flags 0x%x\n",
 900		     (unsigned long long)oi->ip_blkno,
 901		     (unsigned long long)le64_to_cpu(di->i_blkno),
 902		     le32_to_cpu(di->i_flags), oi->ip_flags);
 903		goto bail;
 904	}
 905
 906	/* has someone already deleted us?! baaad... */
 907	if (di->i_dtime) {
 908		status = -EEXIST;
 909		mlog_errno(status);
 910		goto bail;
 911	}
 912
 913	/*
 914	 * This is how ocfs2 determines whether an inode is still live
 915	 * within the cluster. Every node takes a shared read lock on
 916	 * the inode open lock in ocfs2_read_locked_inode(). When we
 917	 * get to ->delete_inode(), each node tries to convert it's
 918	 * lock to an exclusive. Trylocks are serialized by the inode
 919	 * meta data lock. If the upconvert succeeds, we know the inode
 920	 * is no longer live and can be deleted.
 921	 *
 922	 * Though we call this with the meta data lock held, the
 923	 * trylock keeps us from ABBA deadlock.
 924	 */
 925	status = ocfs2_try_open_lock(inode, 1);
 926	if (status == -EAGAIN) {
 927		status = 0;
 928		reason = 3;
 929		goto bail;
 930	}
 931	if (status < 0) {
 932		mlog_errno(status);
 933		goto bail;
 934	}
 935
 936	*wipe = 1;
 937	trace_ocfs2_query_inode_wipe_succ(le16_to_cpu(di->i_orphaned_slot));
 938
 939bail:
 940	trace_ocfs2_query_inode_wipe_end(status, reason);
 941	return status;
 942}
 943
 944/* Support function for ocfs2_delete_inode. Will help us keep the
 945 * inode data in a consistent state for clear_inode. Always truncates
 946 * pages, optionally sync's them first. */
 947static void ocfs2_cleanup_delete_inode(struct inode *inode,
 948				       int sync_data)
 949{
 950	trace_ocfs2_cleanup_delete_inode(
 951		(unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
 952	if (sync_data)
 953		filemap_write_and_wait(inode->i_mapping);
 954	truncate_inode_pages(&inode->i_data, 0);
 955}
 956
 957static void ocfs2_delete_inode(struct inode *inode)
 958{
 959	int wipe, status;
 960	sigset_t oldset;
 961	struct buffer_head *di_bh = NULL;
 962
 963	trace_ocfs2_delete_inode(inode->i_ino,
 964				 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 965				 is_bad_inode(inode));
 966
 967	/* When we fail in read_inode() we mark inode as bad. The second test
 968	 * catches the case when inode allocation fails before allocating
 969	 * a block for inode. */
 970	if (is_bad_inode(inode) || !OCFS2_I(inode)->ip_blkno)
 971		goto bail;
 972
 973	dquot_initialize(inode);
 974
 975	if (!ocfs2_inode_is_valid_to_delete(inode)) {
 976		/* It's probably not necessary to truncate_inode_pages
 977		 * here but we do it for safety anyway (it will most
 978		 * likely be a no-op anyway) */
 979		ocfs2_cleanup_delete_inode(inode, 0);
 980		goto bail;
 981	}
 982
 983	/* We want to block signals in delete_inode as the lock and
 984	 * messaging paths may return us -ERESTARTSYS. Which would
 985	 * cause us to exit early, resulting in inodes being orphaned
 986	 * forever. */
 987	ocfs2_block_signals(&oldset);
 988
 989	/*
 990	 * Synchronize us against ocfs2_get_dentry. We take this in
 991	 * shared mode so that all nodes can still concurrently
 992	 * process deletes.
 993	 */
 994	status = ocfs2_nfs_sync_lock(OCFS2_SB(inode->i_sb), 0);
 995	if (status < 0) {
 996		mlog(ML_ERROR, "getting nfs sync lock(PR) failed %d\n", status);
 997		ocfs2_cleanup_delete_inode(inode, 0);
 998		goto bail_unblock;
 999	}
1000	/* Lock down the inode. This gives us an up to date view of
1001	 * it's metadata (for verification), and allows us to
1002	 * serialize delete_inode on multiple nodes.
1003	 *
1004	 * Even though we might be doing a truncate, we don't take the
1005	 * allocation lock here as it won't be needed - nobody will
1006	 * have the file open.
1007	 */
1008	status = ocfs2_inode_lock(inode, &di_bh, 1);
1009	if (status < 0) {
1010		if (status != -ENOENT)
1011			mlog_errno(status);
1012		ocfs2_cleanup_delete_inode(inode, 0);
1013		goto bail_unlock_nfs_sync;
1014	}
1015
1016	/* Query the cluster. This will be the final decision made
1017	 * before we go ahead and wipe the inode. */
1018	status = ocfs2_query_inode_wipe(inode, di_bh, &wipe);
1019	if (!wipe || status < 0) {
1020		/* Error and remote inode busy both mean we won't be
1021		 * removing the inode, so they take almost the same
1022		 * path. */
1023		if (status < 0)
1024			mlog_errno(status);
1025
1026		/* Someone in the cluster has disallowed a wipe of
1027		 * this inode, or it was never completely
1028		 * orphaned. Write out the pages and exit now. */
1029		ocfs2_cleanup_delete_inode(inode, 1);
1030		goto bail_unlock_inode;
1031	}
1032
1033	ocfs2_cleanup_delete_inode(inode, 0);
1034
1035	status = ocfs2_wipe_inode(inode, di_bh);
1036	if (status < 0) {
1037		if (status != -EDEADLK)
1038			mlog_errno(status);
1039		goto bail_unlock_inode;
1040	}
1041
1042	/*
1043	 * Mark the inode as successfully deleted.
1044	 *
1045	 * This is important for ocfs2_clear_inode() as it will check
1046	 * this flag and skip any checkpointing work
1047	 *
1048	 * ocfs2_stuff_meta_lvb() also uses this flag to invalidate
1049	 * the LVB for other nodes.
1050	 */
1051	OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED;
1052
1053bail_unlock_inode:
1054	ocfs2_inode_unlock(inode, 1);
1055	brelse(di_bh);
1056
1057bail_unlock_nfs_sync:
1058	ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);
1059
1060bail_unblock:
1061	ocfs2_unblock_signals(&oldset);
1062bail:
1063	return;
1064}
1065
1066static void ocfs2_clear_inode(struct inode *inode)
1067{
1068	int status;
1069	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1070
1071	clear_inode(inode);
1072	trace_ocfs2_clear_inode((unsigned long long)oi->ip_blkno,
1073				inode->i_nlink);
1074
1075	mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL,
1076			"Inode=%lu\n", inode->i_ino);
1077
1078	dquot_drop(inode);
1079
1080	/* To preven remote deletes we hold open lock before, now it
1081	 * is time to unlock PR and EX open locks. */
1082	ocfs2_open_unlock(inode);
1083
1084	/* Do these before all the other work so that we don't bounce
1085	 * the downconvert thread while waiting to destroy the locks. */
1086	ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres);
1087	ocfs2_mark_lockres_freeing(&oi->ip_inode_lockres);
1088	ocfs2_mark_lockres_freeing(&oi->ip_open_lockres);
1089
1090	ocfs2_resv_discard(&OCFS2_SB(inode->i_sb)->osb_la_resmap,
1091			   &oi->ip_la_data_resv);
1092	ocfs2_resv_init_once(&oi->ip_la_data_resv);
1093
1094	/* We very well may get a clear_inode before all an inodes
1095	 * metadata has hit disk. Of course, we can't drop any cluster
1096	 * locks until the journal has finished with it. The only
1097	 * exception here are successfully wiped inodes - their
1098	 * metadata can now be considered to be part of the system
1099	 * inodes from which it came. */
1100	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED))
1101		ocfs2_checkpoint_inode(inode);
1102
1103	mlog_bug_on_msg(!list_empty(&oi->ip_io_markers),
1104			"Clear inode of %llu, inode has io markers\n",
1105			(unsigned long long)oi->ip_blkno);
1106
1107	ocfs2_extent_map_trunc(inode, 0);
1108
1109	status = ocfs2_drop_inode_locks(inode);
1110	if (status < 0)
1111		mlog_errno(status);
1112
1113	ocfs2_lock_res_free(&oi->ip_rw_lockres);
1114	ocfs2_lock_res_free(&oi->ip_inode_lockres);
1115	ocfs2_lock_res_free(&oi->ip_open_lockres);
1116
1117	ocfs2_metadata_cache_exit(INODE_CACHE(inode));
1118
1119	mlog_bug_on_msg(INODE_CACHE(inode)->ci_num_cached,
1120			"Clear inode of %llu, inode has %u cache items\n",
1121			(unsigned long long)oi->ip_blkno,
1122			INODE_CACHE(inode)->ci_num_cached);
1123
1124	mlog_bug_on_msg(!(INODE_CACHE(inode)->ci_flags & OCFS2_CACHE_FL_INLINE),
1125			"Clear inode of %llu, inode has a bad flag\n",
1126			(unsigned long long)oi->ip_blkno);
1127
1128	mlog_bug_on_msg(spin_is_locked(&oi->ip_lock),
1129			"Clear inode of %llu, inode is locked\n",
1130			(unsigned long long)oi->ip_blkno);
1131
1132	mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex),
1133			"Clear inode of %llu, io_mutex is locked\n",
1134			(unsigned long long)oi->ip_blkno);
1135	mutex_unlock(&oi->ip_io_mutex);
1136
1137	/*
1138	 * down_trylock() returns 0, down_write_trylock() returns 1
1139	 * kernel 1, world 0
1140	 */
1141	mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem),
1142			"Clear inode of %llu, alloc_sem is locked\n",
1143			(unsigned long long)oi->ip_blkno);
1144	up_write(&oi->ip_alloc_sem);
1145
1146	mlog_bug_on_msg(oi->ip_open_count,
1147			"Clear inode of %llu has open count %d\n",
1148			(unsigned long long)oi->ip_blkno, oi->ip_open_count);
1149
1150	/* Clear all other flags. */
1151	oi->ip_flags = 0;
1152	oi->ip_dir_start_lookup = 0;
1153	oi->ip_blkno = 0ULL;
1154
1155	/*
1156	 * ip_jinode is used to track txns against this inode. We ensure that
1157	 * the journal is flushed before journal shutdown. Thus it is safe to
1158	 * have inodes get cleaned up after journal shutdown.
1159	 */
1160	jbd2_journal_release_jbd_inode(OCFS2_SB(inode->i_sb)->journal->j_journal,
1161				       &oi->ip_jinode);
1162}
1163
1164void ocfs2_evict_inode(struct inode *inode)
1165{
1166	if (!inode->i_nlink ||
1167	    (OCFS2_I(inode)->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)) {
1168		ocfs2_delete_inode(inode);
1169	} else {
1170		truncate_inode_pages(&inode->i_data, 0);
1171	}
1172	ocfs2_clear_inode(inode);
1173}
1174
1175/* Called under inode_lock, with no more references on the
1176 * struct inode, so it's safe here to check the flags field
1177 * and to manipulate i_nlink without any other locks. */
1178int ocfs2_drop_inode(struct inode *inode)
1179{
1180	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1181	int res;
1182
1183	trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
1184				inode->i_nlink, oi->ip_flags);
1185
1186	if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)
1187		res = 1;
1188	else
1189		res = generic_drop_inode(inode);
1190
1191	return res;
1192}
1193
1194/*
1195 * This is called from our getattr.
1196 */
1197int ocfs2_inode_revalidate(struct dentry *dentry)
1198{
1199	struct inode *inode = dentry->d_inode;
1200	int status = 0;
1201
1202	trace_ocfs2_inode_revalidate(inode,
1203		inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL,
1204		inode ? (unsigned long long)OCFS2_I(inode)->ip_flags : 0);
1205
1206	if (!inode) {
1207		status = -ENOENT;
1208		goto bail;
1209	}
1210
1211	spin_lock(&OCFS2_I(inode)->ip_lock);
1212	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
1213		spin_unlock(&OCFS2_I(inode)->ip_lock);
1214		status = -ENOENT;
1215		goto bail;
1216	}
1217	spin_unlock(&OCFS2_I(inode)->ip_lock);
1218
1219	/* Let ocfs2_inode_lock do the work of updating our struct
1220	 * inode for us. */
1221	status = ocfs2_inode_lock(inode, NULL, 0);
1222	if (status < 0) {
1223		if (status != -ENOENT)
1224			mlog_errno(status);
1225		goto bail;
1226	}
1227	ocfs2_inode_unlock(inode, 0);
1228bail:
1229	return status;
1230}
1231
1232/*
1233 * Updates a disk inode from a
1234 * struct inode.
1235 * Only takes ip_lock.
1236 */
1237int ocfs2_mark_inode_dirty(handle_t *handle,
1238			   struct inode *inode,
1239			   struct buffer_head *bh)
1240{
1241	int status;
1242	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
1243
1244	trace_ocfs2_mark_inode_dirty((unsigned long long)OCFS2_I(inode)->ip_blkno);
1245
1246	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1247					 OCFS2_JOURNAL_ACCESS_WRITE);
1248	if (status < 0) {
1249		mlog_errno(status);
1250		goto leave;
1251	}
1252
1253	spin_lock(&OCFS2_I(inode)->ip_lock);
1254	fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
1255	ocfs2_get_inode_flags(OCFS2_I(inode));
1256	fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);
1257	fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
1258	spin_unlock(&OCFS2_I(inode)->ip_lock);
1259
1260	fe->i_size = cpu_to_le64(i_size_read(inode));
1261	ocfs2_set_links_count(fe, inode->i_nlink);
1262	fe->i_uid = cpu_to_le32(inode->i_uid);
1263	fe->i_gid = cpu_to_le32(inode->i_gid);
1264	fe->i_mode = cpu_to_le16(inode->i_mode);
1265	fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
1266	fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
1267	fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1268	fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1269	fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
1270	fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
1271
1272	ocfs2_journal_dirty(handle, bh);
1273leave:
1274	return status;
1275}
1276
1277/*
1278 *
1279 * Updates a struct inode from a disk inode.
1280 * does no i/o, only takes ip_lock.
1281 */
1282void ocfs2_refresh_inode(struct inode *inode,
1283			 struct ocfs2_dinode *fe)
1284{
1285	spin_lock(&OCFS2_I(inode)->ip_lock);
1286
1287	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
1288	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
1289	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
1290	ocfs2_set_inode_flags(inode);
1291	i_size_write(inode, le64_to_cpu(fe->i_size));
1292	set_nlink(inode, ocfs2_read_links_count(fe));
1293	inode->i_uid = le32_to_cpu(fe->i_uid);
1294	inode->i_gid = le32_to_cpu(fe->i_gid);
1295	inode->i_mode = le16_to_cpu(fe->i_mode);
1296	if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0)
1297		inode->i_blocks = 0;
1298	else
1299		inode->i_blocks = ocfs2_inode_sector_count(inode);
1300	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
1301	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
1302	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
1303	inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
1304	inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
1305	inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
1306
1307	spin_unlock(&OCFS2_I(inode)->ip_lock);
1308}
1309
1310int ocfs2_validate_inode_block(struct super_block *sb,
1311			       struct buffer_head *bh)
1312{
1313	int rc;
1314	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1315
1316	trace_ocfs2_validate_inode_block((unsigned long long)bh->b_blocknr);
1317
1318	BUG_ON(!buffer_uptodate(bh));
1319
1320	/*
1321	 * If the ecc fails, we return the error but otherwise
1322	 * leave the filesystem running.  We know any error is
1323	 * local to this block.
1324	 */
1325	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
1326	if (rc) {
1327		mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
1328		     (unsigned long long)bh->b_blocknr);
1329		goto bail;
1330	}
1331
1332	/*
1333	 * Errors after here are fatal.
1334	 */
1335
1336	rc = -EINVAL;
1337
1338	if (!OCFS2_IS_VALID_DINODE(di)) {
1339		ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s\n",
1340			    (unsigned long long)bh->b_blocknr, 7,
1341			    di->i_signature);
1342		goto bail;
1343	}
1344
1345	if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1346		ocfs2_error(sb, "Invalid dinode #%llu: i_blkno is %llu\n",
1347			    (unsigned long long)bh->b_blocknr,
1348			    (unsigned long long)le64_to_cpu(di->i_blkno));
1349		goto bail;
1350	}
1351
1352	if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1353		ocfs2_error(sb,
1354			    "Invalid dinode #%llu: OCFS2_VALID_FL not set\n",
1355			    (unsigned long long)bh->b_blocknr);
1356		goto bail;
1357	}
1358
1359	if (le32_to_cpu(di->i_fs_generation) !=
1360	    OCFS2_SB(sb)->fs_generation) {
1361		ocfs2_error(sb,
1362			    "Invalid dinode #%llu: fs_generation is %u\n",
1363			    (unsigned long long)bh->b_blocknr,
1364			    le32_to_cpu(di->i_fs_generation));
1365		goto bail;
1366	}
1367
1368	rc = 0;
1369
1370bail:
1371	return rc;
1372}
1373
1374int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
1375				int flags)
1376{
1377	int rc;
1378	struct buffer_head *tmp = *bh;
1379
1380	rc = ocfs2_read_blocks(INODE_CACHE(inode), OCFS2_I(inode)->ip_blkno,
1381			       1, &tmp, flags, ocfs2_validate_inode_block);
1382
1383	/* If ocfs2_read_blocks() got us a new bh, pass it up. */
1384	if (!rc && !*bh)
1385		*bh = tmp;
1386
1387	return rc;
1388}
1389
1390int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
1391{
1392	return ocfs2_read_inode_block_full(inode, bh, 0);
1393}
1394
1395
1396static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
1397{
1398	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1399
1400	return oi->ip_blkno;
1401}
1402
1403static struct super_block *ocfs2_inode_cache_get_super(struct ocfs2_caching_info *ci)
1404{
1405	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1406
1407	return oi->vfs_inode.i_sb;
1408}
1409
1410static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
1411{
1412	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1413
1414	spin_lock(&oi->ip_lock);
1415}
1416
1417static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
1418{
1419	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1420
1421	spin_unlock(&oi->ip_lock);
1422}
1423
1424static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
1425{
1426	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1427
1428	mutex_lock(&oi->ip_io_mutex);
1429}
1430
1431static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
1432{
1433	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1434
1435	mutex_unlock(&oi->ip_io_mutex);
1436}
1437
1438const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
1439	.co_owner		= ocfs2_inode_cache_owner,
1440	.co_get_super		= ocfs2_inode_cache_get_super,
1441	.co_cache_lock		= ocfs2_inode_cache_lock,
1442	.co_cache_unlock	= ocfs2_inode_cache_unlock,
1443	.co_io_lock		= ocfs2_inode_cache_io_lock,
1444	.co_io_unlock		= ocfs2_inode_cache_io_unlock,
1445};
1446