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/fs/gfs2/inode.c

https://bitbucket.org/emiliolopez/linux
C | 2122 lines | 1497 code | 317 blank | 308 comment | 349 complexity | a9c18c191abf3475edd375b11237bf98 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0

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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/slab.h>
  11#include <linux/spinlock.h>
  12#include <linux/completion.h>
  13#include <linux/buffer_head.h>
  14#include <linux/namei.h>
  15#include <linux/mm.h>
  16#include <linux/cred.h>
  17#include <linux/xattr.h>
  18#include <linux/posix_acl.h>
  19#include <linux/gfs2_ondisk.h>
  20#include <linux/crc32.h>
  21#include <linux/iomap.h>
  22#include <linux/security.h>
  23#include <linux/uaccess.h>
  24
  25#include "gfs2.h"
  26#include "incore.h"
  27#include "acl.h"
  28#include "bmap.h"
  29#include "dir.h"
  30#include "xattr.h"
  31#include "glock.h"
  32#include "inode.h"
  33#include "meta_io.h"
  34#include "quota.h"
  35#include "rgrp.h"
  36#include "trans.h"
  37#include "util.h"
  38#include "super.h"
  39#include "glops.h"
  40
  41static int iget_test(struct inode *inode, void *opaque)
  42{
  43	u64 no_addr = *(u64 *)opaque;
  44
  45	return GFS2_I(inode)->i_no_addr == no_addr;
  46}
  47
  48static int iget_set(struct inode *inode, void *opaque)
  49{
  50	u64 no_addr = *(u64 *)opaque;
  51
  52	GFS2_I(inode)->i_no_addr = no_addr;
  53	inode->i_ino = no_addr;
  54	return 0;
  55}
  56
  57static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
  58{
  59	struct inode *inode;
  60
  61repeat:
  62	inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
  63	if (!inode)
  64		return inode;
  65	if (is_bad_inode(inode)) {
  66		iput(inode);
  67		goto repeat;
  68	}
  69	return inode;
  70}
  71
  72/**
  73 * gfs2_set_iop - Sets inode operations
  74 * @inode: The inode with correct i_mode filled in
  75 *
  76 * GFS2 lookup code fills in vfs inode contents based on info obtained
  77 * from directory entry inside gfs2_inode_lookup().
  78 */
  79
  80static void gfs2_set_iop(struct inode *inode)
  81{
  82	struct gfs2_sbd *sdp = GFS2_SB(inode);
  83	umode_t mode = inode->i_mode;
  84
  85	if (S_ISREG(mode)) {
  86		inode->i_op = &gfs2_file_iops;
  87		if (gfs2_localflocks(sdp))
  88			inode->i_fop = &gfs2_file_fops_nolock;
  89		else
  90			inode->i_fop = &gfs2_file_fops;
  91	} else if (S_ISDIR(mode)) {
  92		inode->i_op = &gfs2_dir_iops;
  93		if (gfs2_localflocks(sdp))
  94			inode->i_fop = &gfs2_dir_fops_nolock;
  95		else
  96			inode->i_fop = &gfs2_dir_fops;
  97	} else if (S_ISLNK(mode)) {
  98		inode->i_op = &gfs2_symlink_iops;
  99	} else {
 100		inode->i_op = &gfs2_file_iops;
 101		init_special_inode(inode, inode->i_mode, inode->i_rdev);
 102	}
 103}
 104
 105/**
 106 * gfs2_inode_lookup - Lookup an inode
 107 * @sb: The super block
 108 * @type: The type of the inode
 109 * @no_addr: The inode number
 110 * @no_formal_ino: The inode generation number
 111 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
 112 *           GFS2_BLKST_FREE to indicate not to verify)
 113 *
 114 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
 115 *
 116 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
 117 * placeholder because it doesn't otherwise make sense), the on-disk block type
 118 * is verified to be @blktype.
 119 *
 120 * Returns: A VFS inode, or an error
 121 */
 122
 123struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 124				u64 no_addr, u64 no_formal_ino,
 125				unsigned int blktype)
 126{
 127	struct inode *inode;
 128	struct gfs2_inode *ip;
 129	struct gfs2_glock *io_gl = NULL;
 130	struct gfs2_holder i_gh;
 131	int error;
 132
 133	gfs2_holder_mark_uninitialized(&i_gh);
 134	inode = gfs2_iget(sb, no_addr);
 135	if (!inode)
 136		return ERR_PTR(-ENOMEM);
 137
 138	ip = GFS2_I(inode);
 139
 140	if (inode->i_state & I_NEW) {
 141		struct gfs2_sbd *sdp = GFS2_SB(inode);
 142		ip->i_no_formal_ino = no_formal_ino;
 143
 144		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 145		if (unlikely(error))
 146			goto fail;
 147		flush_delayed_work(&ip->i_gl->gl_work);
 148
 149		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 150		if (unlikely(error))
 151			goto fail_put;
 152
 153		if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
 154			/*
 155			 * The GL_SKIP flag indicates to skip reading the inode
 156			 * block.  We read the inode with gfs2_inode_refresh
 157			 * after possibly checking the block type.
 158			 */
 159			error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
 160						   GL_SKIP, &i_gh);
 161			if (error)
 162				goto fail_put;
 163
 164			if (blktype != GFS2_BLKST_FREE) {
 165				error = gfs2_check_blk_type(sdp, no_addr,
 166							    blktype);
 167				if (error)
 168					goto fail_put;
 169			}
 170		}
 171
 172		glock_set_object(ip->i_gl, ip);
 173		set_bit(GIF_INVALID, &ip->i_flags);
 174		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 175		if (unlikely(error))
 176			goto fail_put;
 177		glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 178		gfs2_glock_put(io_gl);
 179		io_gl = NULL;
 180
 181		if (type == DT_UNKNOWN) {
 182			/* Inode glock must be locked already */
 183			error = gfs2_inode_refresh(GFS2_I(inode));
 184			if (error)
 185				goto fail_refresh;
 186		} else {
 187			inode->i_mode = DT2IF(type);
 188		}
 189
 190		gfs2_set_iop(inode);
 191
 192		/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
 193		inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
 194		inode->i_atime.tv_nsec = 0;
 195
 196		unlock_new_inode(inode);
 197	}
 198
 199	if (gfs2_holder_initialized(&i_gh))
 200		gfs2_glock_dq_uninit(&i_gh);
 201	return inode;
 202
 203fail_refresh:
 204	ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
 205	glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
 206	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 207fail_put:
 208	if (io_gl)
 209		gfs2_glock_put(io_gl);
 210	glock_clear_object(ip->i_gl, ip);
 211	if (gfs2_holder_initialized(&i_gh))
 212		gfs2_glock_dq_uninit(&i_gh);
 213fail:
 214	iget_failed(inode);
 215	return ERR_PTR(error);
 216}
 217
 218struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 219				  u64 *no_formal_ino, unsigned int blktype)
 220{
 221	struct super_block *sb = sdp->sd_vfs;
 222	struct inode *inode;
 223	int error;
 224
 225	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
 226	if (IS_ERR(inode))
 227		return inode;
 228
 229	/* Two extra checks for NFS only */
 230	if (no_formal_ino) {
 231		error = -ESTALE;
 232		if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
 233			goto fail_iput;
 234
 235		error = -EIO;
 236		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
 237			goto fail_iput;
 238	}
 239	return inode;
 240
 241fail_iput:
 242	iput(inode);
 243	return ERR_PTR(error);
 244}
 245
 246
 247struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 248{
 249	struct qstr qstr;
 250	struct inode *inode;
 251	gfs2_str2qstr(&qstr, name);
 252	inode = gfs2_lookupi(dip, &qstr, 1);
 253	/* gfs2_lookupi has inconsistent callers: vfs
 254	 * related routines expect NULL for no entry found,
 255	 * gfs2_lookup_simple callers expect ENOENT
 256	 * and do not check for NULL.
 257	 */
 258	if (inode == NULL)
 259		return ERR_PTR(-ENOENT);
 260	else
 261		return inode;
 262}
 263
 264
 265/**
 266 * gfs2_lookupi - Look up a filename in a directory and return its inode
 267 * @d_gh: An initialized holder for the directory glock
 268 * @name: The name of the inode to look for
 269 * @is_root: If 1, ignore the caller's permissions
 270 * @i_gh: An uninitialized holder for the new inode glock
 271 *
 272 * This can be called via the VFS filldir function when NFS is doing
 273 * a readdirplus and the inode which its intending to stat isn't
 274 * already in cache. In this case we must not take the directory glock
 275 * again, since the readdir call will have already taken that lock.
 276 *
 277 * Returns: errno
 278 */
 279
 280struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 281			   int is_root)
 282{
 283	struct super_block *sb = dir->i_sb;
 284	struct gfs2_inode *dip = GFS2_I(dir);
 285	struct gfs2_holder d_gh;
 286	int error = 0;
 287	struct inode *inode = NULL;
 288
 289	gfs2_holder_mark_uninitialized(&d_gh);
 290	if (!name->len || name->len > GFS2_FNAMESIZE)
 291		return ERR_PTR(-ENAMETOOLONG);
 292
 293	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
 294	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
 295	     dir == d_inode(sb->s_root))) {
 296		igrab(dir);
 297		return dir;
 298	}
 299
 300	if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
 301		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 302		if (error)
 303			return ERR_PTR(error);
 304	}
 305
 306	if (!is_root) {
 307		error = gfs2_permission(dir, MAY_EXEC);
 308		if (error)
 309			goto out;
 310	}
 311
 312	inode = gfs2_dir_search(dir, name, false);
 313	if (IS_ERR(inode))
 314		error = PTR_ERR(inode);
 315out:
 316	if (gfs2_holder_initialized(&d_gh))
 317		gfs2_glock_dq_uninit(&d_gh);
 318	if (error == -ENOENT)
 319		return NULL;
 320	return inode ? inode : ERR_PTR(error);
 321}
 322
 323/**
 324 * create_ok - OK to create a new on-disk inode here?
 325 * @dip:  Directory in which dinode is to be created
 326 * @name:  Name of new dinode
 327 * @mode:
 328 *
 329 * Returns: errno
 330 */
 331
 332static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 333		     umode_t mode)
 334{
 335	int error;
 336
 337	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
 338	if (error)
 339		return error;
 340
 341	/*  Don't create entries in an unlinked directory  */
 342	if (!dip->i_inode.i_nlink)
 343		return -ENOENT;
 344
 345	if (dip->i_entries == (u32)-1)
 346		return -EFBIG;
 347	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
 348		return -EMLINK;
 349
 350	return 0;
 351}
 352
 353static void munge_mode_uid_gid(const struct gfs2_inode *dip,
 354			       struct inode *inode)
 355{
 356	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
 357	    (dip->i_inode.i_mode & S_ISUID) &&
 358	    !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
 359		if (S_ISDIR(inode->i_mode))
 360			inode->i_mode |= S_ISUID;
 361		else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
 362			inode->i_mode &= ~07111;
 363		inode->i_uid = dip->i_inode.i_uid;
 364	} else
 365		inode->i_uid = current_fsuid();
 366
 367	if (dip->i_inode.i_mode & S_ISGID) {
 368		if (S_ISDIR(inode->i_mode))
 369			inode->i_mode |= S_ISGID;
 370		inode->i_gid = dip->i_inode.i_gid;
 371	} else
 372		inode->i_gid = current_fsgid();
 373}
 374
 375static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
 376{
 377	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 378	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
 379	int error;
 380
 381	error = gfs2_quota_lock_check(ip, &ap);
 382	if (error)
 383		goto out;
 384
 385	error = gfs2_inplace_reserve(ip, &ap);
 386	if (error)
 387		goto out_quota;
 388
 389	error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
 390	if (error)
 391		goto out_ipreserv;
 392
 393	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
 394	ip->i_no_formal_ino = ip->i_generation;
 395	ip->i_inode.i_ino = ip->i_no_addr;
 396	ip->i_goal = ip->i_no_addr;
 397
 398	gfs2_trans_end(sdp);
 399
 400out_ipreserv:
 401	gfs2_inplace_release(ip);
 402out_quota:
 403	gfs2_quota_unlock(ip);
 404out:
 405	return error;
 406}
 407
 408static void gfs2_init_dir(struct buffer_head *dibh,
 409			  const struct gfs2_inode *parent)
 410{
 411	struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 412	struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 413
 414	gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
 415	dent->de_inum = di->di_num; /* already GFS2 endian */
 416	dent->de_type = cpu_to_be16(DT_DIR);
 417
 418	dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 419	gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 420	gfs2_inum_out(parent, dent);
 421	dent->de_type = cpu_to_be16(DT_DIR);
 422	
 423}
 424
 425/**
 426 * gfs2_init_xattr - Initialise an xattr block for a new inode
 427 * @ip: The inode in question
 428 *
 429 * This sets up an empty xattr block for a new inode, ready to
 430 * take any ACLs, LSM xattrs, etc.
 431 */
 432
 433static void gfs2_init_xattr(struct gfs2_inode *ip)
 434{
 435	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 436	struct buffer_head *bh;
 437	struct gfs2_ea_header *ea;
 438
 439	bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
 440	gfs2_trans_add_meta(ip->i_gl, bh);
 441	gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 442	gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
 443
 444	ea = GFS2_EA_BH2FIRST(bh);
 445	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 446	ea->ea_type = GFS2_EATYPE_UNUSED;
 447	ea->ea_flags = GFS2_EAFLAG_LAST;
 448
 449	brelse(bh);
 450}
 451
 452/**
 453 * init_dinode - Fill in a new dinode structure
 454 * @dip: The directory this inode is being created in
 455 * @ip: The inode
 456 * @symname: The symlink destination (if a symlink)
 457 * @bhp: The buffer head (returned to caller)
 458 *
 459 */
 460
 461static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
 462			const char *symname)
 463{
 464	struct gfs2_dinode *di;
 465	struct buffer_head *dibh;
 466
 467	dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
 468	gfs2_trans_add_meta(ip->i_gl, dibh);
 469	di = (struct gfs2_dinode *)dibh->b_data;
 470	gfs2_dinode_out(ip, di);
 471
 472	di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
 473	di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
 474	di->__pad1 = 0;
 475	di->__pad2 = 0;
 476	di->__pad3 = 0;
 477	memset(&di->__pad4, 0, sizeof(di->__pad4));
 478	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
 479	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 480
 481	switch(ip->i_inode.i_mode & S_IFMT) {
 482	case S_IFDIR:
 483		gfs2_init_dir(dibh, dip);
 484		break;
 485	case S_IFLNK:
 486		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
 487		break;
 488	}
 489
 490	set_buffer_uptodate(dibh);
 491	brelse(dibh);
 492}
 493
 494/**
 495 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 496 * @dip: The directory we are linking into
 497 * @da: The dir add information
 498 * @nr_inodes: The number of inodes involved
 499 *
 500 * This calculate the number of blocks we need to reserve in a
 501 * transaction to link @nr_inodes into a directory. In most cases
 502 * @nr_inodes will be 2 (the directory plus the inode being linked in)
 503 * but in case of rename, 4 may be required.
 504 *
 505 * Returns: Number of blocks
 506 */
 507
 508static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
 509				   const struct gfs2_diradd *da,
 510				   unsigned nr_inodes)
 511{
 512	return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
 513	       (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
 514}
 515
 516static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 517		       struct gfs2_inode *ip, struct gfs2_diradd *da)
 518{
 519	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 520	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
 521	int error;
 522
 523	if (da->nr_blocks) {
 524		error = gfs2_quota_lock_check(dip, &ap);
 525		if (error)
 526			goto fail_quota_locks;
 527
 528		error = gfs2_inplace_reserve(dip, &ap);
 529		if (error)
 530			goto fail_quota_locks;
 531
 532		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
 533		if (error)
 534			goto fail_ipreserv;
 535	} else {
 536		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
 537		if (error)
 538			goto fail_quota_locks;
 539	}
 540
 541	error = gfs2_dir_add(&dip->i_inode, name, ip, da);
 542
 543	gfs2_trans_end(sdp);
 544fail_ipreserv:
 545	gfs2_inplace_release(dip);
 546fail_quota_locks:
 547	gfs2_quota_unlock(dip);
 548	return error;
 549}
 550
 551static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 552		    void *fs_info)
 553{
 554	const struct xattr *xattr;
 555	int err = 0;
 556
 557	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 558		err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
 559				       xattr->value_len, 0,
 560				       GFS2_EATYPE_SECURITY);
 561		if (err < 0)
 562			break;
 563	}
 564	return err;
 565}
 566
 567/**
 568 * gfs2_create_inode - Create a new inode
 569 * @dir: The parent directory
 570 * @dentry: The new dentry
 571 * @file: If non-NULL, the file which is being opened
 572 * @mode: The permissions on the new inode
 573 * @dev: For device nodes, this is the device number
 574 * @symname: For symlinks, this is the link destination
 575 * @size: The initial size of the inode (ignored for directories)
 576 *
 577 * Returns: 0 on success, or error code
 578 */
 579
 580static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 581			     struct file *file,
 582			     umode_t mode, dev_t dev, const char *symname,
 583			     unsigned int size, int excl, int *opened)
 584{
 585	const struct qstr *name = &dentry->d_name;
 586	struct posix_acl *default_acl, *acl;
 587	struct gfs2_holder ghs[2];
 588	struct inode *inode = NULL;
 589	struct gfs2_inode *dip = GFS2_I(dir), *ip;
 590	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 591	struct gfs2_glock *io_gl = NULL;
 592	int error, free_vfs_inode = 1;
 593	u32 aflags = 0;
 594	unsigned blocks = 1;
 595	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 596
 597	if (!name->len || name->len > GFS2_FNAMESIZE)
 598		return -ENAMETOOLONG;
 599
 600	error = gfs2_rsqa_alloc(dip);
 601	if (error)
 602		return error;
 603
 604	error = gfs2_rindex_update(sdp);
 605	if (error)
 606		return error;
 607
 608	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 609	if (error)
 610		goto fail;
 611	gfs2_holder_mark_uninitialized(ghs + 1);
 612
 613	error = create_ok(dip, name, mode);
 614	if (error)
 615		goto fail_gunlock;
 616
 617	inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
 618	error = PTR_ERR(inode);
 619	if (!IS_ERR(inode)) {
 620		if (S_ISDIR(inode->i_mode)) {
 621			iput(inode);
 622			inode = ERR_PTR(-EISDIR);
 623			goto fail_gunlock;
 624		}
 625		d_instantiate(dentry, inode);
 626		error = 0;
 627		if (file) {
 628			if (S_ISREG(inode->i_mode))
 629				error = finish_open(file, dentry, gfs2_open_common, opened);
 630			else
 631				error = finish_no_open(file, NULL);
 632		}
 633		gfs2_glock_dq_uninit(ghs);
 634		return error;
 635	} else if (error != -ENOENT) {
 636		goto fail_gunlock;
 637	}
 638
 639	error = gfs2_diradd_alloc_required(dir, name, &da);
 640	if (error < 0)
 641		goto fail_gunlock;
 642
 643	inode = new_inode(sdp->sd_vfs);
 644	error = -ENOMEM;
 645	if (!inode)
 646		goto fail_gunlock;
 647
 648	error = posix_acl_create(dir, &mode, &default_acl, &acl);
 649	if (error)
 650		goto fail_gunlock;
 651
 652	ip = GFS2_I(inode);
 653	error = gfs2_rsqa_alloc(ip);
 654	if (error)
 655		goto fail_free_acls;
 656
 657	inode->i_mode = mode;
 658	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
 659	inode->i_rdev = dev;
 660	inode->i_size = size;
 661	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 662	gfs2_set_inode_blocks(inode, 1);
 663	munge_mode_uid_gid(dip, inode);
 664	check_and_update_goal(dip);
 665	ip->i_goal = dip->i_goal;
 666	ip->i_diskflags = 0;
 667	ip->i_eattr = 0;
 668	ip->i_height = 0;
 669	ip->i_depth = 0;
 670	ip->i_entries = 0;
 671	ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
 672
 673	switch(mode & S_IFMT) {
 674	case S_IFREG:
 675		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
 676		    gfs2_tune_get(sdp, gt_new_files_jdata))
 677			ip->i_diskflags |= GFS2_DIF_JDATA;
 678		gfs2_set_aops(inode);
 679		break;
 680	case S_IFDIR:
 681		ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
 682		ip->i_diskflags |= GFS2_DIF_JDATA;
 683		ip->i_entries = 2;
 684		break;
 685	}
 686
 687	/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
 688	if (dip->i_diskflags & GFS2_DIF_SYSTEM)
 689		ip->i_diskflags |= GFS2_DIF_SYSTEM;
 690
 691	gfs2_set_inode_flags(inode);
 692
 693	if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
 694	    (dip->i_diskflags & GFS2_DIF_TOPDIR))
 695		aflags |= GFS2_AF_ORLOV;
 696
 697	if (default_acl || acl)
 698		blocks++;
 699
 700	error = alloc_dinode(ip, aflags, &blocks);
 701	if (error)
 702		goto fail_free_inode;
 703
 704	gfs2_set_inode_blocks(inode, blocks);
 705
 706	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 707	if (error)
 708		goto fail_free_inode;
 709	flush_delayed_work(&ip->i_gl->gl_work);
 710	glock_set_object(ip->i_gl, ip);
 711
 712	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
 713	if (error)
 714		goto fail_free_inode;
 715
 716	error = gfs2_trans_begin(sdp, blocks, 0);
 717	if (error)
 718		goto fail_gunlock2;
 719
 720	if (blocks > 1) {
 721		ip->i_eattr = ip->i_no_addr + 1;
 722		gfs2_init_xattr(ip);
 723	}
 724	init_dinode(dip, ip, symname);
 725	gfs2_trans_end(sdp);
 726
 727	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 728	if (error)
 729		goto fail_gunlock2;
 730
 731	BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
 732
 733	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 734	if (error)
 735		goto fail_gunlock2;
 736
 737	glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 738	gfs2_glock_put(io_gl);
 739	gfs2_set_iop(inode);
 740	insert_inode_hash(inode);
 741
 742	free_vfs_inode = 0; /* After this point, the inode is no longer
 743			       considered free. Any failures need to undo
 744			       the gfs2 structures. */
 745	if (default_acl) {
 746		error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 747		posix_acl_release(default_acl);
 748	}
 749	if (acl) {
 750		if (!error)
 751			error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
 752		posix_acl_release(acl);
 753	}
 754
 755	if (error)
 756		goto fail_gunlock3;
 757
 758	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
 759					     &gfs2_initxattrs, NULL);
 760	if (error)
 761		goto fail_gunlock3;
 762
 763	error = link_dinode(dip, name, ip, &da);
 764	if (error)
 765		goto fail_gunlock3;
 766
 767	mark_inode_dirty(inode);
 768	d_instantiate(dentry, inode);
 769	if (file) {
 770		*opened |= FILE_CREATED;
 771		error = finish_open(file, dentry, gfs2_open_common, opened);
 772	}
 773	gfs2_glock_dq_uninit(ghs);
 774	gfs2_glock_dq_uninit(ghs + 1);
 775	clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 776	return error;
 777
 778fail_gunlock3:
 779	glock_clear_object(io_gl, ip);
 780	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 781	gfs2_glock_put(io_gl);
 782fail_gunlock2:
 783	if (io_gl)
 784		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 785fail_free_inode:
 786	if (ip->i_gl) {
 787		glock_clear_object(ip->i_gl, ip);
 788		gfs2_glock_put(ip->i_gl);
 789	}
 790	gfs2_rsqa_delete(ip, NULL);
 791fail_free_acls:
 792	if (default_acl)
 793		posix_acl_release(default_acl);
 794	if (acl)
 795		posix_acl_release(acl);
 796fail_gunlock:
 797	gfs2_dir_no_add(&da);
 798	gfs2_glock_dq_uninit(ghs);
 799	if (inode && !IS_ERR(inode)) {
 800		clear_nlink(inode);
 801		if (!free_vfs_inode)
 802			mark_inode_dirty(inode);
 803		set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
 804			&GFS2_I(inode)->i_flags);
 805		iput(inode);
 806	}
 807	if (gfs2_holder_initialized(ghs + 1))
 808		gfs2_glock_dq_uninit(ghs + 1);
 809fail:
 810	return error;
 811}
 812
 813/**
 814 * gfs2_create - Create a file
 815 * @dir: The directory in which to create the file
 816 * @dentry: The dentry of the new file
 817 * @mode: The mode of the new file
 818 *
 819 * Returns: errno
 820 */
 821
 822static int gfs2_create(struct inode *dir, struct dentry *dentry,
 823		       umode_t mode, bool excl)
 824{
 825	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
 826}
 827
 828/**
 829 * __gfs2_lookup - Look up a filename in a directory and return its inode
 830 * @dir: The directory inode
 831 * @dentry: The dentry of the new inode
 832 * @file: File to be opened
 833 * @opened: atomic_open flags
 834 *
 835 *
 836 * Returns: errno
 837 */
 838
 839static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 840				    struct file *file, int *opened)
 841{
 842	struct inode *inode;
 843	struct dentry *d;
 844	struct gfs2_holder gh;
 845	struct gfs2_glock *gl;
 846	int error;
 847
 848	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 849	if (inode == NULL) {
 850		d_add(dentry, NULL);
 851		return NULL;
 852	}
 853	if (IS_ERR(inode))
 854		return ERR_CAST(inode);
 855
 856	gl = GFS2_I(inode)->i_gl;
 857	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 858	if (error) {
 859		iput(inode);
 860		return ERR_PTR(error);
 861	}
 862
 863	d = d_splice_alias(inode, dentry);
 864	if (IS_ERR(d)) {
 865		gfs2_glock_dq_uninit(&gh);
 866		return d;
 867	}
 868	if (file && S_ISREG(inode->i_mode))
 869		error = finish_open(file, dentry, gfs2_open_common, opened);
 870
 871	gfs2_glock_dq_uninit(&gh);
 872	if (error) {
 873		dput(d);
 874		return ERR_PTR(error);
 875	}
 876	return d;
 877}
 878
 879static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 880				  unsigned flags)
 881{
 882	return __gfs2_lookup(dir, dentry, NULL, NULL);
 883}
 884
 885/**
 886 * gfs2_link - Link to a file
 887 * @old_dentry: The inode to link
 888 * @dir: Add link to this directory
 889 * @dentry: The name of the link
 890 *
 891 * Link the inode in "old_dentry" into the directory "dir" with the
 892 * name in "dentry".
 893 *
 894 * Returns: errno
 895 */
 896
 897static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 898		     struct dentry *dentry)
 899{
 900	struct gfs2_inode *dip = GFS2_I(dir);
 901	struct gfs2_sbd *sdp = GFS2_SB(dir);
 902	struct inode *inode = d_inode(old_dentry);
 903	struct gfs2_inode *ip = GFS2_I(inode);
 904	struct gfs2_holder ghs[2];
 905	struct buffer_head *dibh;
 906	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 907	int error;
 908
 909	if (S_ISDIR(inode->i_mode))
 910		return -EPERM;
 911
 912	error = gfs2_rsqa_alloc(dip);
 913	if (error)
 914		return error;
 915
 916	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 917	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 918
 919	error = gfs2_glock_nq(ghs); /* parent */
 920	if (error)
 921		goto out_parent;
 922
 923	error = gfs2_glock_nq(ghs + 1); /* child */
 924	if (error)
 925		goto out_child;
 926
 927	error = -ENOENT;
 928	if (inode->i_nlink == 0)
 929		goto out_gunlock;
 930
 931	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 932	if (error)
 933		goto out_gunlock;
 934
 935	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 936	switch (error) {
 937	case -ENOENT:
 938		break;
 939	case 0:
 940		error = -EEXIST;
 941	default:
 942		goto out_gunlock;
 943	}
 944
 945	error = -EINVAL;
 946	if (!dip->i_inode.i_nlink)
 947		goto out_gunlock;
 948	error = -EFBIG;
 949	if (dip->i_entries == (u32)-1)
 950		goto out_gunlock;
 951	error = -EPERM;
 952	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 953		goto out_gunlock;
 954	error = -EINVAL;
 955	if (!ip->i_inode.i_nlink)
 956		goto out_gunlock;
 957	error = -EMLINK;
 958	if (ip->i_inode.i_nlink == (u32)-1)
 959		goto out_gunlock;
 960
 961	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
 962	if (error < 0)
 963		goto out_gunlock;
 964
 965	if (da.nr_blocks) {
 966		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
 967		error = gfs2_quota_lock_check(dip, &ap);
 968		if (error)
 969			goto out_gunlock;
 970
 971		error = gfs2_inplace_reserve(dip, &ap);
 972		if (error)
 973			goto out_gunlock_q;
 974
 975		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
 976		if (error)
 977			goto out_ipres;
 978	} else {
 979		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 980		if (error)
 981			goto out_ipres;
 982	}
 983
 984	error = gfs2_meta_inode_buffer(ip, &dibh);
 985	if (error)
 986		goto out_end_trans;
 987
 988	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
 989	if (error)
 990		goto out_brelse;
 991
 992	gfs2_trans_add_meta(ip->i_gl, dibh);
 993	inc_nlink(&ip->i_inode);
 994	ip->i_inode.i_ctime = current_time(&ip->i_inode);
 995	ihold(inode);
 996	d_instantiate(dentry, inode);
 997	mark_inode_dirty(inode);
 998
 999out_brelse:
1000	brelse(dibh);
1001out_end_trans:
1002	gfs2_trans_end(sdp);
1003out_ipres:
1004	if (da.nr_blocks)
1005		gfs2_inplace_release(dip);
1006out_gunlock_q:
1007	if (da.nr_blocks)
1008		gfs2_quota_unlock(dip);
1009out_gunlock:
1010	gfs2_dir_no_add(&da);
1011	gfs2_glock_dq(ghs + 1);
1012out_child:
1013	gfs2_glock_dq(ghs);
1014out_parent:
1015	gfs2_holder_uninit(ghs);
1016	gfs2_holder_uninit(ghs + 1);
1017	return error;
1018}
1019
1020/*
1021 * gfs2_unlink_ok - check to see that a inode is still in a directory
1022 * @dip: the directory
1023 * @name: the name of the file
1024 * @ip: the inode
1025 *
1026 * Assumes that the lock on (at least) @dip is held.
1027 *
1028 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1029 */
1030
1031static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1032			  const struct gfs2_inode *ip)
1033{
1034	int error;
1035
1036	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1037		return -EPERM;
1038
1039	if ((dip->i_inode.i_mode & S_ISVTX) &&
1040	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1041	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1042		return -EPERM;
1043
1044	if (IS_APPEND(&dip->i_inode))
1045		return -EPERM;
1046
1047	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1048	if (error)
1049		return error;
1050
1051	return gfs2_dir_check(&dip->i_inode, name, ip);
1052}
1053
1054/**
1055 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1056 * @dip: The parent directory
1057 * @name: The name of the entry in the parent directory
1058 * @inode: The inode to be removed
1059 *
1060 * Called with all the locks and in a transaction. This will only be
1061 * called for a directory after it has been checked to ensure it is empty.
1062 *
1063 * Returns: 0 on success, or an error
1064 */
1065
1066static int gfs2_unlink_inode(struct gfs2_inode *dip,
1067			     const struct dentry *dentry)
1068{
1069	struct inode *inode = d_inode(dentry);
1070	struct gfs2_inode *ip = GFS2_I(inode);
1071	int error;
1072
1073	error = gfs2_dir_del(dip, dentry);
1074	if (error)
1075		return error;
1076
1077	ip->i_entries = 0;
1078	inode->i_ctime = current_time(inode);
1079	if (S_ISDIR(inode->i_mode))
1080		clear_nlink(inode);
1081	else
1082		drop_nlink(inode);
1083	mark_inode_dirty(inode);
1084	if (inode->i_nlink == 0)
1085		gfs2_unlink_di(inode);
1086	return 0;
1087}
1088
1089
1090/**
1091 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1092 * @dir: The inode of the directory containing the inode to unlink
1093 * @dentry: The file itself
1094 *
1095 * This routine uses the type of the inode as a flag to figure out
1096 * whether this is an unlink or an rmdir.
1097 *
1098 * Returns: errno
1099 */
1100
1101static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1102{
1103	struct gfs2_inode *dip = GFS2_I(dir);
1104	struct gfs2_sbd *sdp = GFS2_SB(dir);
1105	struct inode *inode = d_inode(dentry);
1106	struct gfs2_inode *ip = GFS2_I(inode);
1107	struct gfs2_holder ghs[3];
1108	struct gfs2_rgrpd *rgd;
1109	int error;
1110
1111	error = gfs2_rindex_update(sdp);
1112	if (error)
1113		return error;
1114
1115	error = -EROFS;
1116
1117	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1118	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1119
1120	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1121	if (!rgd)
1122		goto out_inodes;
1123
1124	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1125
1126
1127	error = gfs2_glock_nq(ghs); /* parent */
1128	if (error)
1129		goto out_parent;
1130
1131	error = gfs2_glock_nq(ghs + 1); /* child */
1132	if (error)
1133		goto out_child;
1134
1135	error = -ENOENT;
1136	if (inode->i_nlink == 0)
1137		goto out_rgrp;
1138
1139	if (S_ISDIR(inode->i_mode)) {
1140		error = -ENOTEMPTY;
1141		if (ip->i_entries > 2 || inode->i_nlink > 2)
1142			goto out_rgrp;
1143	}
1144
1145	error = gfs2_glock_nq(ghs + 2); /* rgrp */
1146	if (error)
1147		goto out_rgrp;
1148
1149	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1150	if (error)
1151		goto out_gunlock;
1152
1153	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1154	if (error)
1155		goto out_end_trans;
1156
1157	error = gfs2_unlink_inode(dip, dentry);
1158
1159out_end_trans:
1160	gfs2_trans_end(sdp);
1161out_gunlock:
1162	gfs2_glock_dq(ghs + 2);
1163out_rgrp:
1164	gfs2_glock_dq(ghs + 1);
1165out_child:
1166	gfs2_glock_dq(ghs);
1167out_parent:
1168	gfs2_holder_uninit(ghs + 2);
1169out_inodes:
1170	gfs2_holder_uninit(ghs + 1);
1171	gfs2_holder_uninit(ghs);
1172	return error;
1173}
1174
1175/**
1176 * gfs2_symlink - Create a symlink
1177 * @dir: The directory to create the symlink in
1178 * @dentry: The dentry to put the symlink in
1179 * @symname: The thing which the link points to
1180 *
1181 * Returns: errno
1182 */
1183
1184static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1185			const char *symname)
1186{
1187	struct gfs2_sbd *sdp = GFS2_SB(dir);
1188	unsigned int size;
1189
1190	size = strlen(symname);
1191	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1192		return -ENAMETOOLONG;
1193
1194	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1195}
1196
1197/**
1198 * gfs2_mkdir - Make a directory
1199 * @dir: The parent directory of the new one
1200 * @dentry: The dentry of the new directory
1201 * @mode: The mode of the new directory
1202 *
1203 * Returns: errno
1204 */
1205
1206static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1207{
1208	struct gfs2_sbd *sdp = GFS2_SB(dir);
1209	unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1210	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1211}
1212
1213/**
1214 * gfs2_mknod - Make a special file
1215 * @dir: The directory in which the special file will reside
1216 * @dentry: The dentry of the special file
1217 * @mode: The mode of the special file
1218 * @dev: The device specification of the special file
1219 *
1220 */
1221
1222static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1223		      dev_t dev)
1224{
1225	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1226}
1227
1228/**
1229 * gfs2_atomic_open - Atomically open a file
1230 * @dir: The directory
1231 * @dentry: The proposed new entry
1232 * @file: The proposed new struct file
1233 * @flags: open flags
1234 * @mode: File mode
1235 * @opened: Flag to say whether the file has been opened or not
1236 *
1237 * Returns: error code or 0 for success
1238 */
1239
1240static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1241			    struct file *file, unsigned flags,
1242			    umode_t mode, int *opened)
1243{
1244	struct dentry *d;
1245	bool excl = !!(flags & O_EXCL);
1246
1247	if (!d_in_lookup(dentry))
1248		goto skip_lookup;
1249
1250	d = __gfs2_lookup(dir, dentry, file, opened);
1251	if (IS_ERR(d))
1252		return PTR_ERR(d);
1253	if (d != NULL)
1254		dentry = d;
1255	if (d_really_is_positive(dentry)) {
1256		if (!(*opened & FILE_OPENED))
1257			return finish_no_open(file, d);
1258		dput(d);
1259		return 0;
1260	}
1261
1262	BUG_ON(d != NULL);
1263
1264skip_lookup:
1265	if (!(flags & O_CREAT))
1266		return -ENOENT;
1267
1268	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1269}
1270
1271/*
1272 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1273 * @this: move this
1274 * @to: to here
1275 *
1276 * Follow @to back to the root and make sure we don't encounter @this
1277 * Assumes we already hold the rename lock.
1278 *
1279 * Returns: errno
1280 */
1281
1282static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1283{
1284	struct inode *dir = &to->i_inode;
1285	struct super_block *sb = dir->i_sb;
1286	struct inode *tmp;
1287	int error = 0;
1288
1289	igrab(dir);
1290
1291	for (;;) {
1292		if (dir == &this->i_inode) {
1293			error = -EINVAL;
1294			break;
1295		}
1296		if (dir == d_inode(sb->s_root)) {
1297			error = 0;
1298			break;
1299		}
1300
1301		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1302		if (!tmp) {
1303			error = -ENOENT;
1304			break;
1305		}
1306		if (IS_ERR(tmp)) {
1307			error = PTR_ERR(tmp);
1308			break;
1309		}
1310
1311		iput(dir);
1312		dir = tmp;
1313	}
1314
1315	iput(dir);
1316
1317	return error;
1318}
1319
1320/**
1321 * update_moved_ino - Update an inode that's being moved
1322 * @ip: The inode being moved
1323 * @ndip: The parent directory of the new filename
1324 * @dir_rename: True of ip is a directory
1325 *
1326 * Returns: errno
1327 */
1328
1329static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1330			    int dir_rename)
1331{
1332	int error;
1333	struct buffer_head *dibh;
1334
1335	if (dir_rename)
1336		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1337
1338	error = gfs2_meta_inode_buffer(ip, &dibh);
1339	if (error)
1340		return error;
1341	ip->i_inode.i_ctime = current_time(&ip->i_inode);
1342	gfs2_trans_add_meta(ip->i_gl, dibh);
1343	gfs2_dinode_out(ip, dibh->b_data);
1344	brelse(dibh);
1345	return 0;
1346}
1347
1348
1349/**
1350 * gfs2_rename - Rename a file
1351 * @odir: Parent directory of old file name
1352 * @odentry: The old dentry of the file
1353 * @ndir: Parent directory of new file name
1354 * @ndentry: The new dentry of the file
1355 *
1356 * Returns: errno
1357 */
1358
1359static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1360		       struct inode *ndir, struct dentry *ndentry)
1361{
1362	struct gfs2_inode *odip = GFS2_I(odir);
1363	struct gfs2_inode *ndip = GFS2_I(ndir);
1364	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1365	struct gfs2_inode *nip = NULL;
1366	struct gfs2_sbd *sdp = GFS2_SB(odir);
1367	struct gfs2_holder ghs[5], r_gh;
1368	struct gfs2_rgrpd *nrgd;
1369	unsigned int num_gh;
1370	int dir_rename = 0;
1371	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1372	unsigned int x;
1373	int error;
1374
1375	gfs2_holder_mark_uninitialized(&r_gh);
1376	if (d_really_is_positive(ndentry)) {
1377		nip = GFS2_I(d_inode(ndentry));
1378		if (ip == nip)
1379			return 0;
1380	}
1381
1382	error = gfs2_rindex_update(sdp);
1383	if (error)
1384		return error;
1385
1386	error = gfs2_rsqa_alloc(ndip);
1387	if (error)
1388		return error;
1389
1390	if (odip != ndip) {
1391		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1392					   0, &r_gh);
1393		if (error)
1394			goto out;
1395
1396		if (S_ISDIR(ip->i_inode.i_mode)) {
1397			dir_rename = 1;
1398			/* don't move a directory into its subdir */
1399			error = gfs2_ok_to_move(ip, ndip);
1400			if (error)
1401				goto out_gunlock_r;
1402		}
1403	}
1404
1405	num_gh = 1;
1406	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1407	if (odip != ndip) {
1408		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1409		num_gh++;
1410	}
1411	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1412	num_gh++;
1413
1414	if (nip) {
1415		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1416		num_gh++;
1417		/* grab the resource lock for unlink flag twiddling 
1418		 * this is the case of the target file already existing
1419		 * so we unlink before doing the rename
1420		 */
1421		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1422		if (nrgd)
1423			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1424	}
1425
1426	for (x = 0; x < num_gh; x++) {
1427		error = gfs2_glock_nq(ghs + x);
1428		if (error)
1429			goto out_gunlock;
1430	}
1431
1432	error = -ENOENT;
1433	if (ip->i_inode.i_nlink == 0)
1434		goto out_gunlock;
1435
1436	/* Check out the old directory */
1437
1438	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1439	if (error)
1440		goto out_gunlock;
1441
1442	/* Check out the new directory */
1443
1444	if (nip) {
1445		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1446		if (error)
1447			goto out_gunlock;
1448
1449		if (nip->i_inode.i_nlink == 0) {
1450			error = -EAGAIN;
1451			goto out_gunlock;
1452		}
1453
1454		if (S_ISDIR(nip->i_inode.i_mode)) {
1455			if (nip->i_entries < 2) {
1456				gfs2_consist_inode(nip);
1457				error = -EIO;
1458				goto out_gunlock;
1459			}
1460			if (nip->i_entries > 2) {
1461				error = -ENOTEMPTY;
1462				goto out_gunlock;
1463			}
1464		}
1465	} else {
1466		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1467		if (error)
1468			goto out_gunlock;
1469
1470		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1471		switch (error) {
1472		case -ENOENT:
1473			error = 0;
1474			break;
1475		case 0:
1476			error = -EEXIST;
1477		default:
1478			goto out_gunlock;
1479		};
1480
1481		if (odip != ndip) {
1482			if (!ndip->i_inode.i_nlink) {
1483				error = -ENOENT;
1484				goto out_gunlock;
1485			}
1486			if (ndip->i_entries == (u32)-1) {
1487				error = -EFBIG;
1488				goto out_gunlock;
1489			}
1490			if (S_ISDIR(ip->i_inode.i_mode) &&
1491			    ndip->i_inode.i_nlink == (u32)-1) {
1492				error = -EMLINK;
1493				goto out_gunlock;
1494			}
1495		}
1496	}
1497
1498	/* Check out the dir to be renamed */
1499
1500	if (dir_rename) {
1501		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1502		if (error)
1503			goto out_gunlock;
1504	}
1505
1506	if (nip == NULL) {
1507		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1508		if (error)
1509			goto out_gunlock;
1510	}
1511
1512	if (da.nr_blocks) {
1513		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1514		error = gfs2_quota_lock_check(ndip, &ap);
1515		if (error)
1516			goto out_gunlock;
1517
1518		error = gfs2_inplace_reserve(ndip, &ap);
1519		if (error)
1520			goto out_gunlock_q;
1521
1522		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1523					 4 * RES_LEAF + 4, 0);
1524		if (error)
1525			goto out_ipreserv;
1526	} else {
1527		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1528					 5 * RES_LEAF + 4, 0);
1529		if (error)
1530			goto out_gunlock;
1531	}
1532
1533	/* Remove the target file, if it exists */
1534
1535	if (nip)
1536		error = gfs2_unlink_inode(ndip, ndentry);
1537
1538	error = update_moved_ino(ip, ndip, dir_rename);
1539	if (error)
1540		goto out_end_trans;
1541
1542	error = gfs2_dir_del(odip, odentry);
1543	if (error)
1544		goto out_end_trans;
1545
1546	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1547	if (error)
1548		goto out_end_trans;
1549
1550out_end_trans:
1551	gfs2_trans_end(sdp);
1552out_ipreserv:
1553	if (da.nr_blocks)
1554		gfs2_inplace_release(ndip);
1555out_gunlock_q:
1556	if (da.nr_blocks)
1557		gfs2_quota_unlock(ndip);
1558out_gunlock:
1559	gfs2_dir_no_add(&da);
1560	while (x--) {
1561		gfs2_glock_dq(ghs + x);
1562		gfs2_holder_uninit(ghs + x);
1563	}
1564out_gunlock_r:
1565	if (gfs2_holder_initialized(&r_gh))
1566		gfs2_glock_dq_uninit(&r_gh);
1567out:
1568	return error;
1569}
1570
1571/**
1572 * gfs2_exchange - exchange two files
1573 * @odir: Parent directory of old file name
1574 * @odentry: The old dentry of the file
1575 * @ndir: Parent directory of new file name
1576 * @ndentry: The new dentry of the file
1577 * @flags: The rename flags
1578 *
1579 * Returns: errno
1580 */
1581
1582static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1583			 struct inode *ndir, struct dentry *ndentry,
1584			 unsigned int flags)
1585{
1586	struct gfs2_inode *odip = GFS2_I(odir);
1587	struct gfs2_inode *ndip = GFS2_I(ndir);
1588	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1589	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1590	struct gfs2_sbd *sdp = GFS2_SB(odir);
1591	struct gfs2_holder ghs[5], r_gh;
1592	unsigned int num_gh;
1593	unsigned int x;
1594	umode_t old_mode = oip->i_inode.i_mode;
1595	umode_t new_mode = nip->i_inode.i_mode;
1596	int error;
1597
1598	gfs2_holder_mark_uninitialized(&r_gh);
1599	error = gfs2_rindex_update(sdp);
1600	if (error)
1601		return error;
1602
1603	if (odip != ndip) {
1604		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1605					   0, &r_gh);
1606		if (error)
1607			goto out;
1608
1609		if (S_ISDIR(old_mode)) {
1610			/* don't move a directory into its subdir */
1611			error = gfs2_ok_to_move(oip, ndip);
1612			if (error)
1613				goto out_gunlock_r;
1614		}
1615
1616		if (S_ISDIR(new_mode)) {
1617			/* don't move a directory into its subdir */
1618			error = gfs2_ok_to_move(nip, odip);
1619			if (error)
1620				goto out_gunlock_r;
1621		}
1622	}
1623
1624	num_gh = 1;
1625	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1626	if (odip != ndip) {
1627		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1628		num_gh++;
1629	}
1630	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1631	num_gh++;
1632
1633	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1634	num_gh++;
1635
1636	for (x = 0; x < num_gh; x++) {
1637		error = gfs2_glock_nq(ghs + x);
1638		if (error)
1639			goto out_gunlock;
1640	}
1641
1642	error = -ENOENT;
1643	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1644		goto out_gunlock;
1645
1646	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1647	if (error)
1648		goto out_gunlock;
1649	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1650	if (error)
1651		goto out_gunlock;
1652
1653	if (S_ISDIR(old_mode)) {
1654		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1655		if (error)
1656			goto out_gunlock;
1657	}
1658	if (S_ISDIR(new_mode)) {
1659		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1660		if (error)
1661			goto out_gunlock;
1662	}
1663	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1664	if (error)
1665		goto out_gunlock;
1666
1667	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1668	if (error)
1669		goto out_end_trans;
1670
1671	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1672	if (error)
1673		goto out_end_trans;
1674
1675	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1676			       IF2DT(old_mode));
1677	if (error)
1678		goto out_end_trans;
1679
1680	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1681			       IF2DT(new_mode));
1682	if (error)
1683		goto out_end_trans;
1684
1685	if (odip != ndip) {
1686		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1687			inc_nlink(&odip->i_inode);
1688			drop_nlink(&ndip->i_inode);
1689		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1690			inc_nlink(&ndip->i_inode);
1691			drop_nlink(&odip->i_inode);
1692		}
1693	}
1694	mark_inode_dirty(&ndip->i_inode);
1695	if (odip != ndip)
1696		mark_inode_dirty(&odip->i_inode);
1697
1698out_end_trans:
1699	gfs2_trans_end(sdp);
1700out_gunlock:
1701	while (x--) {
1702		gfs2_glock_dq(ghs + x);
1703		gfs2_holder_uninit(ghs + x);
1704	}
1705out_gunlock_r:
1706	if (gfs2_holder_initialized(&r_gh))
1707		gfs2_glock_dq_uninit(&r_gh);
1708out:
1709	return error;
1710}
1711
1712static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1713			struct inode *ndir, struct dentry *ndentry,
1714			unsigned int flags)
1715{
1716	flags &= ~RENAME_NOREPLACE;
1717
1718	if (flags & ~RENAME_EXCHANGE)
1719		return -EINVAL;
1720
1721	if (flags & RENAME_EXCHANGE)
1722		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1723
1724	return gfs2_rename(odir, odentry, ndir, ndentry);
1725}
1726
1727/**
1728 * gfs2_get_link - Follow a symbolic link
1729 * @dentry: The dentry of the link
1730 * @inode: The inode of the link
1731 * @done: destructor for return value
1732 *
1733 * This can handle symlinks of any size.
1734 *
1735 * Returns: 0 on success or error code
1736 */
1737
1738static const char *gfs2_get_link(struct dentry *dentry,
1739				 struct inode *inode,
1740				 struct delayed_call *done)
1741{
1742	struct gfs2_inode *ip = GFS2_I(inode);
1743	struct gfs2_holder i_gh;
1744	struct buffer_head *dibh;
1745	unsigned int size;
1746	char *buf;
1747	int error;
1748
1749	if (!dentry)
1750		return ERR_PTR(-ECHILD);
1751
1752	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1753	error = gfs2_glock_nq(&i_gh);
1754	if (error) {
1755		gfs2_holder_uninit(&i_gh);
1756		return ERR_PTR(error);
1757	}
1758
1759	size = (unsigned int)i_size_read(&ip->i_inode);
1760	if (size == 0) {
1761		gfs2_consist_inode(ip);
1762		buf = ERR_PTR(-EIO);
1763		goto out;
1764	}
1765
1766	error = gfs2_meta_inode_buffer(ip, &dibh);
1767	if (error) {
1768		buf = ERR_PTR(error);
1769		goto out;
1770	}
1771
1772	buf = kzalloc(size + 1, GFP_NOFS);
1773	if (!buf)
1774		buf = ERR_PTR(-ENOMEM);
1775	else
1776		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1777	brelse(dibh);
1778out:
1779	gfs2_glock_dq_uninit(&i_gh);
1780	if (!IS_ERR(buf))
1781		set_delayed_call(done, kfree_link, buf);
1782	return buf;
1783}
1784
1785/**
1786 * gfs2_permission -
1787 * @inode: The inode
1788 * @mask: The mask to be tested
1789 * @flags: Indicates whether this is an RCU path walk or not
1790 *
1791 * This may be called from the VFS directly, or from within GFS2 with the
1792 * inode locked, so we look to see if the glock is already locked and only
1793 * lock the glock if its not already been done.
1794 *
1795 * Returns: errno
1796 */
1797
1798int gfs2_permission(struct inode *inode, int mask)
1799{
1800	struct gfs2_inode *ip;
1801	struct gfs2_holder i_gh;
1802	int error;
1803
1804	gfs2_holder_mark_uninitialized(&i_gh);
1805	ip = GFS2_I(inode);
1806	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1807		if (mask & MAY_NOT_BLOCK)
1808			return -ECHILD;
1809		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1810		if (error)
1811			return error;
1812	}
1813
1814	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1815		error = -EPERM;
1816	else
1817		error = generic_permission(inode, mask);
1818	if (gfs2_holder_initialized(&i_gh))
1819		gfs2_glock_dq_uninit(&i_gh);
1820
1821	return error;
1822}
1823
1824static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1825{
1826	setattr_copy(inode, attr);
1827	mark_inode_dirty(inode);
1828	return 0;
1829}
1830
1831/**
1832 * gfs2_setattr_simple -
1833 * @ip:
1834 * @attr:
1835 *
1836 * Returns: errno
1837 */
1838
1839int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1840{
1841	int error;
1842
1843	if (current->journal_info)
1844		return __gfs2_setattr_simple(inode, attr);
1845
1846	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1847	if (error)
1848		return error;
1849
1850	error = __gfs2_setattr_simple(inode, attr);
1851	gfs2_trans_end(GFS2_SB(inode));
1852	return error;
1853}
1854
1855static int setattr_chown(struct inode *inode, struct iattr *attr)
1856{
1857	struct gfs2_inode *ip = GFS2_I(inode);
1858	struct gfs2_sbd *sdp = GFS2_SB(inode);
1859	kuid_t ouid, nuid;
1860	kgid_t ogid, ngid;
1861	int error;
1862	struct gfs2_alloc_parms ap;
1863
1864	ouid = inode->i_uid;
1865	ogid = inode->i_gid;
1866	nuid = attr->ia_uid;
1867	ngid = attr->ia_gid;
1868
1869	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1870		ouid = nuid = NO_UID_QUOTA_CHANGE;
1871	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1872		ogid = ngid = NO_GID_QUOTA_CHANGE;
1873
1874	error = gfs2_rsqa_alloc(ip);
1875	if (error)
1876		goto out;
1877
1878	error = gfs2_rindex_update(sdp);
1879	if (error)
1880		goto out;
1881
1882	error = gfs2_quota_lock(ip, nuid, ngid);
1883	if (error)
1884		goto out;
1885
1886	ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1887
1888	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1889	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1890		error = gfs2_quota_check(ip, nuid, ngid, &ap);
1891		if (error)
1892			goto out_gunlock_q;
1893	}
1894
1895	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1896	if (error)
1897		goto out_gunlock_q;
1898
1899	error = gfs2_setattr_simple(inode, attr);
1900	if (error)
1901		goto out_end_trans;
1902
1903	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1904	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1905		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1906		gfs2_quota_change(ip, ap.target, nuid, ngid);
1907	}
1908
1909out_end_trans:
1910	gfs2_trans_end(sdp);
1911out_gunlock_q:
1912	gfs2_quota_unlock(ip);
1913out:
1914	return error;
1915}
1916
1917/**
1918 * gfs2_setattr - Change attributes on an inode
1919 * @dentry: The dentry which is changing
1920 * @attr: The structure describing the change
1921 *
1922 * The VFS layer wants to change one or more of an inodes attributes.  Write
1923 * that change out to disk.
1924 *
1925 * Returns: errno
1926 */
1927
1928static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1929{
1930	struct inode *inode = d_inode(dentry);
1931	struct gfs2_inode *ip = GFS2_I(inode);
1932	struct gfs2_holder i_gh;
1933	int error;
1934
1935	error = gfs2_rsqa_alloc(ip);
1936	if (error)
1937		return error;
1938
1939	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1940	if (error)
1941		return error;
1942
1943	error = -EPERM;
1944	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1945		goto out;
1946
1947	error = setattr_prepare(dentry, attr);
1948	if (error)
1949		goto out;
1950
1951	if (attr->ia_valid & ATTR_SIZE)
1952		error = gfs2_setattr_size(inode, attr->ia_size);
1953	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1954		error = setattr_chown(inode, attr);
1955	else {
1956		error = gfs2_setattr_simple(inode, attr);
1957		if (!error && attr->ia_valid & ATTR_MODE)
1958			error = posix_acl_chmod(inode, inode->i_mode);
1959	}
1960
1961out:
1962	if (!error)
1963		mark_inode_dirty(inode);
1964	gfs2_glock_dq_uninit(&i_gh);
1965	return error;
1966}
1967
1968/**
1969 * gfs2_getattr - Read out an inode's attributes
1970 * @path: Object to query
1971 * @stat: The inode's stats
1972 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1973 * @flags: AT_STATX_xxx setting
1974 *
1975 * This may be called from the VFS directly, or from within GFS2 with the
1976 * inode locked, so we look to see if the glock is already locked and only
1977 * lock the glock if its not already been done. Note that its the NFS
1978 * readdirplus operation which causes this to be called (from filldir)
1979 * with the glock already held.
1980 *
1981 * Returns: errno
1982 */
1983
1984static int gfs2_getattr(const struct path *path, struct kstat *stat,
1985			u32 request_mask, unsigned int flags)
1986{
1987	struct inode *inode = d_inode(path->dentry);
1988	struct gfs2_inode *ip = GFS2_I(inode);
1989	struct gfs2_holder gh;
1990	u32 gfsflags;
1991	int error;
1992
1993	gfs2_holder_mark_uninitialized(&gh);
1994	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1995		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1996		if (error)
1997			return error;
1998	}
1999
2000	gfsflags = ip->i_diskflags;
2001	if (gfsflags & GFS2_DIF_APPENDONLY)
2002		stat->attributes |= STATX_ATTR_APPEND;
2003	if (gfsflags & GFS2_DIF_IMMUTABLE)
2004		stat->attributes |= STATX_ATTR_IMMUTABLE;
2005
2006	stat->attributes_mask |= (STATX_ATTR_APPEND |
2007				  STATX_ATTR_COMPRESSED |
2008				  STATX_ATTR_ENCRYPTED |
2009				  STATX_ATTR_IMMUTABLE |
2010				  STATX_ATTR_NODUMP);
2011
2012	generic_fillattr(inode, stat);
2013
2014	if (gfs2_holder_initialized(&gh))
2015		gfs2_glock_dq_uninit(&gh);
2016
2017	return 0;
2018}
2019
2020const struct iomap_ops gfs2_iomap_ops = {
2021	.iomap_begin = gfs2_iomap_begin,
2022};
2023
2024static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2025		       u64 start, u64 len)
2026{
2027	struct gfs2_inode *ip = GFS2_I(inode);
2028	struct gfs2_holder gh;
2029	int ret;
2030
2031	inode_lock_shared(inode);
2032
2033	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2034	if (ret)
2035		goto out;
2036
2037	ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2038
2039	gfs2_glock_dq_uninit(&gh);
2040
2041out:
2042	inode_unlock_shared(inode);
2043	return ret;
2044}
2045
2046loff_t gfs2_seek_data(struct file *file, loff_t offset)
2047{
2048	struct inode *inode = file->f_mapping->host;
2049	struct gfs2_inode *ip = GFS2_I(inode);
2050	struct gfs2_holder gh;
2051	loff_t ret;
2052
2053	inode_lock_shared(inode);
2054	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2055	if (!ret)
2056		ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2057	gfs2_glock_dq_uninit(&gh);
2058	inode_unlock_shared(inode);
2059
2060	if (ret < 0)
2061		return ret;
2062	return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2063}
2064
2065loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2066{
2067	struct inode *inode = file->f_mapping->host;
2068	struct gfs2_inode *ip = GFS2_I(inode);
2069	struct gfs2_holder gh;
2070	loff_t ret;
2071
2072	inode_lock_shared(inode);
2073	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2074	if (!ret)
2075		ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2076	gfs2_glock_dq_uninit(&gh);
2077	inode_unlock_shared(inode);
2078
2079	if (ret < 0)
2080		return ret;
2081	return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2082}
2083
2084const struct inode_operations gfs2_file_iops = {
2085	.permission = gfs2_permission,
2086	.setattr = gfs2_setattr,
2087	.getattr = gfs2_getattr,
2088	.listxattr = gfs2_listxattr,
2089	.fiemap = gfs2_fiemap,
2090	.get_acl = gfs2_get_acl,
2091	.set_acl = gfs2_set_acl,
2092};
2093
2094const struct inode_operations gfs2_dir_iops = {
2095	.create = gfs2_create,
2096	.lookup = gfs2_lookup,
2097	.link = gfs2_link,
2098	.unlink = gfs2_unlink,
2099	.symlink = gf

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