PageRenderTime 104ms CodeModel.GetById 3ms app.highlight 88ms RepoModel.GetById 1ms app.codeStats 0ms

/fs/gfs2/inode.c

https://bitbucket.org/emiliolopez/linux
C | 2082 lines | 1468 code | 307 blank | 307 comment | 350 complexity | 935a445f0b5e4b6089c8595749aa2c02 MD5 | raw file
   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/fiemap.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 do 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		glock_set_object(ip->i_gl, ip);
 149
 150		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 151		if (unlikely(error))
 152			goto fail_put;
 153
 154		if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
 155			/*
 156			 * The GL_SKIP flag indicates to skip reading the inode
 157			 * block.  We read the inode with gfs2_inode_refresh
 158			 * after possibly checking the block type.
 159			 */
 160			error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
 161						   GL_SKIP, &i_gh);
 162			if (error)
 163				goto fail_put;
 164
 165			if (blktype != GFS2_BLKST_FREE) {
 166				error = gfs2_check_blk_type(sdp, no_addr,
 167							    blktype);
 168				if (error)
 169					goto fail_put;
 170			}
 171		}
 172
 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		flush_delayed_work(&ip->i_iopen_gh.gh_gl->gl_work);
 178		glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 179		gfs2_glock_put(io_gl);
 180		io_gl = NULL;
 181
 182		if (type == DT_UNKNOWN) {
 183			/* Inode glock must be locked already */
 184			error = gfs2_inode_refresh(GFS2_I(inode));
 185			if (error)
 186				goto fail_refresh;
 187		} else {
 188			inode->i_mode = DT2IF(type);
 189		}
 190
 191		gfs2_set_iop(inode);
 192
 193		inode->i_atime.tv_sec = 0;
 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_set_object(ip->i_iopen_gh.gh_gl, NULL);
 206	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 207fail_put:
 208	if (io_gl)
 209		gfs2_glock_put(io_gl);
 210	if (gfs2_holder_initialized(&i_gh))
 211		gfs2_glock_dq_uninit(&i_gh);
 212	glock_set_object(ip->i_gl, NULL);
 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
 710	glock_set_object(ip->i_gl, ip);
 711	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
 712	if (error)
 713		goto fail_free_inode;
 714
 715	error = gfs2_trans_begin(sdp, blocks, 0);
 716	if (error)
 717		goto fail_gunlock2;
 718
 719	if (blocks > 1) {
 720		ip->i_eattr = ip->i_no_addr + 1;
 721		gfs2_init_xattr(ip);
 722	}
 723	init_dinode(dip, ip, symname);
 724	gfs2_trans_end(sdp);
 725
 726	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 727	if (error)
 728		goto fail_gunlock2;
 729
 730	BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
 731
 732	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 733	if (error)
 734		goto fail_gunlock2;
 735
 736	glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 737	gfs2_glock_put(io_gl);
 738	gfs2_set_iop(inode);
 739	insert_inode_hash(inode);
 740
 741	free_vfs_inode = 0; /* After this point, the inode is no longer
 742			       considered free. Any failures need to undo
 743			       the gfs2 structures. */
 744	if (default_acl) {
 745		error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 746		posix_acl_release(default_acl);
 747	}
 748	if (acl) {
 749		if (!error)
 750			error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
 751		posix_acl_release(acl);
 752	}
 753
 754	if (error)
 755		goto fail_gunlock3;
 756
 757	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
 758					     &gfs2_initxattrs, NULL);
 759	if (error)
 760		goto fail_gunlock3;
 761
 762	error = link_dinode(dip, name, ip, &da);
 763	if (error)
 764		goto fail_gunlock3;
 765
 766	mark_inode_dirty(inode);
 767	d_instantiate(dentry, inode);
 768	if (file) {
 769		*opened |= FILE_CREATED;
 770		error = finish_open(file, dentry, gfs2_open_common, opened);
 771	}
 772	gfs2_glock_dq_uninit(ghs);
 773	gfs2_glock_dq_uninit(ghs + 1);
 774	clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 775	return error;
 776
 777fail_gunlock3:
 778	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 779	gfs2_glock_put(io_gl);
 780fail_gunlock2:
 781	if (io_gl)
 782		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 783fail_free_inode:
 784	if (ip->i_gl)
 785		gfs2_glock_put(ip->i_gl);
 786	gfs2_rsqa_delete(ip, NULL);
 787fail_free_acls:
 788	if (default_acl)
 789		posix_acl_release(default_acl);
 790	if (acl)
 791		posix_acl_release(acl);
 792fail_gunlock:
 793	gfs2_dir_no_add(&da);
 794	gfs2_glock_dq_uninit(ghs);
 795	if (inode && !IS_ERR(inode)) {
 796		clear_nlink(inode);
 797		if (!free_vfs_inode)
 798			mark_inode_dirty(inode);
 799		set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
 800			&GFS2_I(inode)->i_flags);
 801		iput(inode);
 802	}
 803	if (gfs2_holder_initialized(ghs + 1))
 804		gfs2_glock_dq_uninit(ghs + 1);
 805fail:
 806	return error;
 807}
 808
 809/**
 810 * gfs2_create - Create a file
 811 * @dir: The directory in which to create the file
 812 * @dentry: The dentry of the new file
 813 * @mode: The mode of the new file
 814 *
 815 * Returns: errno
 816 */
 817
 818static int gfs2_create(struct inode *dir, struct dentry *dentry,
 819		       umode_t mode, bool excl)
 820{
 821	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
 822}
 823
 824/**
 825 * __gfs2_lookup - Look up a filename in a directory and return its inode
 826 * @dir: The directory inode
 827 * @dentry: The dentry of the new inode
 828 * @file: File to be opened
 829 * @opened: atomic_open flags
 830 *
 831 *
 832 * Returns: errno
 833 */
 834
 835static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 836				    struct file *file, int *opened)
 837{
 838	struct inode *inode;
 839	struct dentry *d;
 840	struct gfs2_holder gh;
 841	struct gfs2_glock *gl;
 842	int error;
 843
 844	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 845	if (inode == NULL) {
 846		d_add(dentry, NULL);
 847		return NULL;
 848	}
 849	if (IS_ERR(inode))
 850		return ERR_CAST(inode);
 851
 852	gl = GFS2_I(inode)->i_gl;
 853	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 854	if (error) {
 855		iput(inode);
 856		return ERR_PTR(error);
 857	}
 858
 859	d = d_splice_alias(inode, dentry);
 860	if (IS_ERR(d)) {
 861		gfs2_glock_dq_uninit(&gh);
 862		return d;
 863	}
 864	if (file && S_ISREG(inode->i_mode))
 865		error = finish_open(file, dentry, gfs2_open_common, opened);
 866
 867	gfs2_glock_dq_uninit(&gh);
 868	if (error) {
 869		dput(d);
 870		return ERR_PTR(error);
 871	}
 872	return d;
 873}
 874
 875static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 876				  unsigned flags)
 877{
 878	return __gfs2_lookup(dir, dentry, NULL, NULL);
 879}
 880
 881/**
 882 * gfs2_link - Link to a file
 883 * @old_dentry: The inode to link
 884 * @dir: Add link to this directory
 885 * @dentry: The name of the link
 886 *
 887 * Link the inode in "old_dentry" into the directory "dir" with the
 888 * name in "dentry".
 889 *
 890 * Returns: errno
 891 */
 892
 893static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 894		     struct dentry *dentry)
 895{
 896	struct gfs2_inode *dip = GFS2_I(dir);
 897	struct gfs2_sbd *sdp = GFS2_SB(dir);
 898	struct inode *inode = d_inode(old_dentry);
 899	struct gfs2_inode *ip = GFS2_I(inode);
 900	struct gfs2_holder ghs[2];
 901	struct buffer_head *dibh;
 902	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 903	int error;
 904
 905	if (S_ISDIR(inode->i_mode))
 906		return -EPERM;
 907
 908	error = gfs2_rsqa_alloc(dip);
 909	if (error)
 910		return error;
 911
 912	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 913	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 914
 915	error = gfs2_glock_nq(ghs); /* parent */
 916	if (error)
 917		goto out_parent;
 918
 919	error = gfs2_glock_nq(ghs + 1); /* child */
 920	if (error)
 921		goto out_child;
 922
 923	error = -ENOENT;
 924	if (inode->i_nlink == 0)
 925		goto out_gunlock;
 926
 927	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 928	if (error)
 929		goto out_gunlock;
 930
 931	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 932	switch (error) {
 933	case -ENOENT:
 934		break;
 935	case 0:
 936		error = -EEXIST;
 937	default:
 938		goto out_gunlock;
 939	}
 940
 941	error = -EINVAL;
 942	if (!dip->i_inode.i_nlink)
 943		goto out_gunlock;
 944	error = -EFBIG;
 945	if (dip->i_entries == (u32)-1)
 946		goto out_gunlock;
 947	error = -EPERM;
 948	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 949		goto out_gunlock;
 950	error = -EINVAL;
 951	if (!ip->i_inode.i_nlink)
 952		goto out_gunlock;
 953	error = -EMLINK;
 954	if (ip->i_inode.i_nlink == (u32)-1)
 955		goto out_gunlock;
 956
 957	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
 958	if (error < 0)
 959		goto out_gunlock;
 960
 961	if (da.nr_blocks) {
 962		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
 963		error = gfs2_quota_lock_check(dip, &ap);
 964		if (error)
 965			goto out_gunlock;
 966
 967		error = gfs2_inplace_reserve(dip, &ap);
 968		if (error)
 969			goto out_gunlock_q;
 970
 971		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
 972		if (error)
 973			goto out_ipres;
 974	} else {
 975		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 976		if (error)
 977			goto out_ipres;
 978	}
 979
 980	error = gfs2_meta_inode_buffer(ip, &dibh);
 981	if (error)
 982		goto out_end_trans;
 983
 984	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
 985	if (error)
 986		goto out_brelse;
 987
 988	gfs2_trans_add_meta(ip->i_gl, dibh);
 989	inc_nlink(&ip->i_inode);
 990	ip->i_inode.i_ctime = current_time(&ip->i_inode);
 991	ihold(inode);
 992	d_instantiate(dentry, inode);
 993	mark_inode_dirty(inode);
 994
 995out_brelse:
 996	brelse(dibh);
 997out_end_trans:
 998	gfs2_trans_end(sdp);
 999out_ipres:
1000	if (da.nr_blocks)
1001		gfs2_inplace_release(dip);
1002out_gunlock_q:
1003	if (da.nr_blocks)
1004		gfs2_quota_unlock(dip);
1005out_gunlock:
1006	gfs2_dir_no_add(&da);
1007	gfs2_glock_dq(ghs + 1);
1008out_child:
1009	gfs2_glock_dq(ghs);
1010out_parent:
1011	gfs2_holder_uninit(ghs);
1012	gfs2_holder_uninit(ghs + 1);
1013	return error;
1014}
1015
1016/*
1017 * gfs2_unlink_ok - check to see that a inode is still in a directory
1018 * @dip: the directory
1019 * @name: the name of the file
1020 * @ip: the inode
1021 *
1022 * Assumes that the lock on (at least) @dip is held.
1023 *
1024 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1025 */
1026
1027static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1028			  const struct gfs2_inode *ip)
1029{
1030	int error;
1031
1032	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1033		return -EPERM;
1034
1035	if ((dip->i_inode.i_mode & S_ISVTX) &&
1036	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1037	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1038		return -EPERM;
1039
1040	if (IS_APPEND(&dip->i_inode))
1041		return -EPERM;
1042
1043	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1044	if (error)
1045		return error;
1046
1047	return gfs2_dir_check(&dip->i_inode, name, ip);
1048}
1049
1050/**
1051 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1052 * @dip: The parent directory
1053 * @name: The name of the entry in the parent directory
1054 * @inode: The inode to be removed
1055 *
1056 * Called with all the locks and in a transaction. This will only be
1057 * called for a directory after it has been checked to ensure it is empty.
1058 *
1059 * Returns: 0 on success, or an error
1060 */
1061
1062static int gfs2_unlink_inode(struct gfs2_inode *dip,
1063			     const struct dentry *dentry)
1064{
1065	struct inode *inode = d_inode(dentry);
1066	struct gfs2_inode *ip = GFS2_I(inode);
1067	int error;
1068
1069	error = gfs2_dir_del(dip, dentry);
1070	if (error)
1071		return error;
1072
1073	ip->i_entries = 0;
1074	inode->i_ctime = current_time(inode);
1075	if (S_ISDIR(inode->i_mode))
1076		clear_nlink(inode);
1077	else
1078		drop_nlink(inode);
1079	mark_inode_dirty(inode);
1080	if (inode->i_nlink == 0)
1081		gfs2_unlink_di(inode);
1082	return 0;
1083}
1084
1085
1086/**
1087 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1088 * @dir: The inode of the directory containing the inode to unlink
1089 * @dentry: The file itself
1090 *
1091 * This routine uses the type of the inode as a flag to figure out
1092 * whether this is an unlink or an rmdir.
1093 *
1094 * Returns: errno
1095 */
1096
1097static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1098{
1099	struct gfs2_inode *dip = GFS2_I(dir);
1100	struct gfs2_sbd *sdp = GFS2_SB(dir);
1101	struct inode *inode = d_inode(dentry);
1102	struct gfs2_inode *ip = GFS2_I(inode);
1103	struct gfs2_holder ghs[3];
1104	struct gfs2_rgrpd *rgd;
1105	int error;
1106
1107	error = gfs2_rindex_update(sdp);
1108	if (error)
1109		return error;
1110
1111	error = -EROFS;
1112
1113	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1114	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1115
1116	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1117	if (!rgd)
1118		goto out_inodes;
1119
1120	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1121
1122
1123	error = gfs2_glock_nq(ghs); /* parent */
1124	if (error)
1125		goto out_parent;
1126
1127	error = gfs2_glock_nq(ghs + 1); /* child */
1128	if (error)
1129		goto out_child;
1130
1131	error = -ENOENT;
1132	if (inode->i_nlink == 0)
1133		goto out_rgrp;
1134
1135	if (S_ISDIR(inode->i_mode)) {
1136		error = -ENOTEMPTY;
1137		if (ip->i_entries > 2 || inode->i_nlink > 2)
1138			goto out_rgrp;
1139	}
1140
1141	error = gfs2_glock_nq(ghs + 2); /* rgrp */
1142	if (error)
1143		goto out_rgrp;
1144
1145	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1146	if (error)
1147		goto out_gunlock;
1148
1149	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1150	if (error)
1151		goto out_end_trans;
1152
1153	error = gfs2_unlink_inode(dip, dentry);
1154
1155out_end_trans:
1156	gfs2_trans_end(sdp);
1157out_gunlock:
1158	gfs2_glock_dq(ghs + 2);
1159out_rgrp:
1160	gfs2_glock_dq(ghs + 1);
1161out_child:
1162	gfs2_glock_dq(ghs);
1163out_parent:
1164	gfs2_holder_uninit(ghs + 2);
1165out_inodes:
1166	gfs2_holder_uninit(ghs + 1);
1167	gfs2_holder_uninit(ghs);
1168	return error;
1169}
1170
1171/**
1172 * gfs2_symlink - Create a symlink
1173 * @dir: The directory to create the symlink in
1174 * @dentry: The dentry to put the symlink in
1175 * @symname: The thing which the link points to
1176 *
1177 * Returns: errno
1178 */
1179
1180static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1181			const char *symname)
1182{
1183	struct gfs2_sbd *sdp = GFS2_SB(dir);
1184	unsigned int size;
1185
1186	size = strlen(symname);
1187	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1188		return -ENAMETOOLONG;
1189
1190	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1191}
1192
1193/**
1194 * gfs2_mkdir - Make a directory
1195 * @dir: The parent directory of the new one
1196 * @dentry: The dentry of the new directory
1197 * @mode: The mode of the new directory
1198 *
1199 * Returns: errno
1200 */
1201
1202static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1203{
1204	struct gfs2_sbd *sdp = GFS2_SB(dir);
1205	unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1206	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1207}
1208
1209/**
1210 * gfs2_mknod - Make a special file
1211 * @dir: The directory in which the special file will reside
1212 * @dentry: The dentry of the special file
1213 * @mode: The mode of the special file
1214 * @dev: The device specification of the special file
1215 *
1216 */
1217
1218static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1219		      dev_t dev)
1220{
1221	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1222}
1223
1224/**
1225 * gfs2_atomic_open - Atomically open a file
1226 * @dir: The directory
1227 * @dentry: The proposed new entry
1228 * @file: The proposed new struct file
1229 * @flags: open flags
1230 * @mode: File mode
1231 * @opened: Flag to say whether the file has been opened or not
1232 *
1233 * Returns: error code or 0 for success
1234 */
1235
1236static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1237			    struct file *file, unsigned flags,
1238			    umode_t mode, int *opened)
1239{
1240	struct dentry *d;
1241	bool excl = !!(flags & O_EXCL);
1242
1243	if (!d_in_lookup(dentry))
1244		goto skip_lookup;
1245
1246	d = __gfs2_lookup(dir, dentry, file, opened);
1247	if (IS_ERR(d))
1248		return PTR_ERR(d);
1249	if (d != NULL)
1250		dentry = d;
1251	if (d_really_is_positive(dentry)) {
1252		if (!(*opened & FILE_OPENED))
1253			return finish_no_open(file, d);
1254		dput(d);
1255		return 0;
1256	}
1257
1258	BUG_ON(d != NULL);
1259
1260skip_lookup:
1261	if (!(flags & O_CREAT))
1262		return -ENOENT;
1263
1264	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1265}
1266
1267/*
1268 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1269 * @this: move this
1270 * @to: to here
1271 *
1272 * Follow @to back to the root and make sure we don't encounter @this
1273 * Assumes we already hold the rename lock.
1274 *
1275 * Returns: errno
1276 */
1277
1278static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1279{
1280	struct inode *dir = &to->i_inode;
1281	struct super_block *sb = dir->i_sb;
1282	struct inode *tmp;
1283	int error = 0;
1284
1285	igrab(dir);
1286
1287	for (;;) {
1288		if (dir == &this->i_inode) {
1289			error = -EINVAL;
1290			break;
1291		}
1292		if (dir == d_inode(sb->s_root)) {
1293			error = 0;
1294			break;
1295		}
1296
1297		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1298		if (!tmp) {
1299			error = -ENOENT;
1300			break;
1301		}
1302		if (IS_ERR(tmp)) {
1303			error = PTR_ERR(tmp);
1304			break;
1305		}
1306
1307		iput(dir);
1308		dir = tmp;
1309	}
1310
1311	iput(dir);
1312
1313	return error;
1314}
1315
1316/**
1317 * update_moved_ino - Update an inode that's being moved
1318 * @ip: The inode being moved
1319 * @ndip: The parent directory of the new filename
1320 * @dir_rename: True of ip is a directory
1321 *
1322 * Returns: errno
1323 */
1324
1325static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1326			    int dir_rename)
1327{
1328	int error;
1329	struct buffer_head *dibh;
1330
1331	if (dir_rename)
1332		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1333
1334	error = gfs2_meta_inode_buffer(ip, &dibh);
1335	if (error)
1336		return error;
1337	ip->i_inode.i_ctime = current_time(&ip->i_inode);
1338	gfs2_trans_add_meta(ip->i_gl, dibh);
1339	gfs2_dinode_out(ip, dibh->b_data);
1340	brelse(dibh);
1341	return 0;
1342}
1343
1344
1345/**
1346 * gfs2_rename - Rename a file
1347 * @odir: Parent directory of old file name
1348 * @odentry: The old dentry of the file
1349 * @ndir: Parent directory of new file name
1350 * @ndentry: The new dentry of the file
1351 *
1352 * Returns: errno
1353 */
1354
1355static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1356		       struct inode *ndir, struct dentry *ndentry)
1357{
1358	struct gfs2_inode *odip = GFS2_I(odir);
1359	struct gfs2_inode *ndip = GFS2_I(ndir);
1360	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1361	struct gfs2_inode *nip = NULL;
1362	struct gfs2_sbd *sdp = GFS2_SB(odir);
1363	struct gfs2_holder ghs[5], r_gh;
1364	struct gfs2_rgrpd *nrgd;
1365	unsigned int num_gh;
1366	int dir_rename = 0;
1367	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1368	unsigned int x;
1369	int error;
1370
1371	gfs2_holder_mark_uninitialized(&r_gh);
1372	if (d_really_is_positive(ndentry)) {
1373		nip = GFS2_I(d_inode(ndentry));
1374		if (ip == nip)
1375			return 0;
1376	}
1377
1378	error = gfs2_rindex_update(sdp);
1379	if (error)
1380		return error;
1381
1382	error = gfs2_rsqa_alloc(ndip);
1383	if (error)
1384		return error;
1385
1386	if (odip != ndip) {
1387		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1388					   0, &r_gh);
1389		if (error)
1390			goto out;
1391
1392		if (S_ISDIR(ip->i_inode.i_mode)) {
1393			dir_rename = 1;
1394			/* don't move a directory into its subdir */
1395			error = gfs2_ok_to_move(ip, ndip);
1396			if (error)
1397				goto out_gunlock_r;
1398		}
1399	}
1400
1401	num_gh = 1;
1402	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1403	if (odip != ndip) {
1404		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1405		num_gh++;
1406	}
1407	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1408	num_gh++;
1409
1410	if (nip) {
1411		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1412		num_gh++;
1413		/* grab the resource lock for unlink flag twiddling 
1414		 * this is the case of the target file already existing
1415		 * so we unlink before doing the rename
1416		 */
1417		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1418		if (nrgd)
1419			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1420	}
1421
1422	for (x = 0; x < num_gh; x++) {
1423		error = gfs2_glock_nq(ghs + x);
1424		if (error)
1425			goto out_gunlock;
1426	}
1427
1428	error = -ENOENT;
1429	if (ip->i_inode.i_nlink == 0)
1430		goto out_gunlock;
1431
1432	/* Check out the old directory */
1433
1434	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1435	if (error)
1436		goto out_gunlock;
1437
1438	/* Check out the new directory */
1439
1440	if (nip) {
1441		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1442		if (error)
1443			goto out_gunlock;
1444
1445		if (nip->i_inode.i_nlink == 0) {
1446			error = -EAGAIN;
1447			goto out_gunlock;
1448		}
1449
1450		if (S_ISDIR(nip->i_inode.i_mode)) {
1451			if (nip->i_entries < 2) {
1452				gfs2_consist_inode(nip);
1453				error = -EIO;
1454				goto out_gunlock;
1455			}
1456			if (nip->i_entries > 2) {
1457				error = -ENOTEMPTY;
1458				goto out_gunlock;
1459			}
1460		}
1461	} else {
1462		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1463		if (error)
1464			goto out_gunlock;
1465
1466		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1467		switch (error) {
1468		case -ENOENT:
1469			error = 0;
1470			break;
1471		case 0:
1472			error = -EEXIST;
1473		default:
1474			goto out_gunlock;
1475		};
1476
1477		if (odip != ndip) {
1478			if (!ndip->i_inode.i_nlink) {
1479				error = -ENOENT;
1480				goto out_gunlock;
1481			}
1482			if (ndip->i_entries == (u32)-1) {
1483				error = -EFBIG;
1484				goto out_gunlock;
1485			}
1486			if (S_ISDIR(ip->i_inode.i_mode) &&
1487			    ndip->i_inode.i_nlink == (u32)-1) {
1488				error = -EMLINK;
1489				goto out_gunlock;
1490			}
1491		}
1492	}
1493
1494	/* Check out the dir to be renamed */
1495
1496	if (dir_rename) {
1497		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1498		if (error)
1499			goto out_gunlock;
1500	}
1501
1502	if (nip == NULL) {
1503		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1504		if (error)
1505			goto out_gunlock;
1506	}
1507
1508	if (da.nr_blocks) {
1509		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1510		error = gfs2_quota_lock_check(ndip, &ap);
1511		if (error)
1512			goto out_gunlock;
1513
1514		error = gfs2_inplace_reserve(ndip, &ap);
1515		if (error)
1516			goto out_gunlock_q;
1517
1518		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1519					 4 * RES_LEAF + 4, 0);
1520		if (error)
1521			goto out_ipreserv;
1522	} else {
1523		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1524					 5 * RES_LEAF + 4, 0);
1525		if (error)
1526			goto out_gunlock;
1527	}
1528
1529	/* Remove the target file, if it exists */
1530
1531	if (nip)
1532		error = gfs2_unlink_inode(ndip, ndentry);
1533
1534	error = update_moved_ino(ip, ndip, dir_rename);
1535	if (error)
1536		goto out_end_trans;
1537
1538	error = gfs2_dir_del(odip, odentry);
1539	if (error)
1540		goto out_end_trans;
1541
1542	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1543	if (error)
1544		goto out_end_trans;
1545
1546out_end_trans:
1547	gfs2_trans_end(sdp);
1548out_ipreserv:
1549	if (da.nr_blocks)
1550		gfs2_inplace_release(ndip);
1551out_gunlock_q:
1552	if (da.nr_blocks)
1553		gfs2_quota_unlock(ndip);
1554out_gunlock:
1555	gfs2_dir_no_add(&da);
1556	while (x--) {
1557		gfs2_glock_dq(ghs + x);
1558		gfs2_holder_uninit(ghs + x);
1559	}
1560out_gunlock_r:
1561	if (gfs2_holder_initialized(&r_gh))
1562		gfs2_glock_dq_uninit(&r_gh);
1563out:
1564	return error;
1565}
1566
1567/**
1568 * gfs2_exchange - exchange two files
1569 * @odir: Parent directory of old file name
1570 * @odentry: The old dentry of the file
1571 * @ndir: Parent directory of new file name
1572 * @ndentry: The new dentry of the file
1573 * @flags: The rename flags
1574 *
1575 * Returns: errno
1576 */
1577
1578static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1579			 struct inode *ndir, struct dentry *ndentry,
1580			 unsigned int flags)
1581{
1582	struct gfs2_inode *odip = GFS2_I(odir);
1583	struct gfs2_inode *ndip = GFS2_I(ndir);
1584	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1585	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1586	struct gfs2_sbd *sdp = GFS2_SB(odir);
1587	struct gfs2_holder ghs[5], r_gh;
1588	unsigned int num_gh;
1589	unsigned int x;
1590	umode_t old_mode = oip->i_inode.i_mode;
1591	umode_t new_mode = nip->i_inode.i_mode;
1592	int error;
1593
1594	gfs2_holder_mark_uninitialized(&r_gh);
1595	error = gfs2_rindex_update(sdp);
1596	if (error)
1597		return error;
1598
1599	if (odip != ndip) {
1600		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1601					   0, &r_gh);
1602		if (error)
1603			goto out;
1604
1605		if (S_ISDIR(old_mode)) {
1606			/* don't move a directory into its subdir */
1607			error = gfs2_ok_to_move(oip, ndip);
1608			if (error)
1609				goto out_gunlock_r;
1610		}
1611
1612		if (S_ISDIR(new_mode)) {
1613			/* don't move a directory into its subdir */
1614			error = gfs2_ok_to_move(nip, odip);
1615			if (error)
1616				goto out_gunlock_r;
1617		}
1618	}
1619
1620	num_gh = 1;
1621	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1622	if (odip != ndip) {
1623		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1624		num_gh++;
1625	}
1626	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1627	num_gh++;
1628
1629	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1630	num_gh++;
1631
1632	for (x = 0; x < num_gh; x++) {
1633		error = gfs2_glock_nq(ghs + x);
1634		if (error)
1635			goto out_gunlock;
1636	}
1637
1638	error = -ENOENT;
1639	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1640		goto out_gunlock;
1641
1642	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1643	if (error)
1644		goto out_gunlock;
1645	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1646	if (error)
1647		goto out_gunlock;
1648
1649	if (S_ISDIR(old_mode)) {
1650		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1651		if (error)
1652			goto out_gunlock;
1653	}
1654	if (S_ISDIR(new_mode)) {
1655		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1656		if (error)
1657			goto out_gunlock;
1658	}
1659	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1660	if (error)
1661		goto out_gunlock;
1662
1663	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1664	if (error)
1665		goto out_end_trans;
1666
1667	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1668	if (error)
1669		goto out_end_trans;
1670
1671	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1672			       IF2DT(old_mode));
1673	if (error)
1674		goto out_end_trans;
1675
1676	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1677			       IF2DT(new_mode));
1678	if (error)
1679		goto out_end_trans;
1680
1681	if (odip != ndip) {
1682		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1683			inc_nlink(&odip->i_inode);
1684			drop_nlink(&ndip->i_inode);
1685		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1686			inc_nlink(&ndip->i_inode);
1687			drop_nlink(&odip->i_inode);
1688		}
1689	}
1690	mark_inode_dirty(&ndip->i_inode);
1691	if (odip != ndip)
1692		mark_inode_dirty(&odip->i_inode);
1693
1694out_end_trans:
1695	gfs2_trans_end(sdp);
1696out_gunlock:
1697	while (x--) {
1698		gfs2_glock_dq(ghs + x);
1699		gfs2_holder_uninit(ghs + x);
1700	}
1701out_gunlock_r:
1702	if (gfs2_holder_initialized(&r_gh))
1703		gfs2_glock_dq_uninit(&r_gh);
1704out:
1705	return error;
1706}
1707
1708static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1709			struct inode *ndir, struct dentry *ndentry,
1710			unsigned int flags)
1711{
1712	flags &= ~RENAME_NOREPLACE;
1713
1714	if (flags & ~RENAME_EXCHANGE)
1715		return -EINVAL;
1716
1717	if (flags & RENAME_EXCHANGE)
1718		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1719
1720	return gfs2_rename(odir, odentry, ndir, ndentry);
1721}
1722
1723/**
1724 * gfs2_get_link - Follow a symbolic link
1725 * @dentry: The dentry of the link
1726 * @inode: The inode of the link
1727 * @done: destructor for return value
1728 *
1729 * This can handle symlinks of any size.
1730 *
1731 * Returns: 0 on success or error code
1732 */
1733
1734static const char *gfs2_get_link(struct dentry *dentry,
1735				 struct inode *inode,
1736				 struct delayed_call *done)
1737{
1738	struct gfs2_inode *ip = GFS2_I(inode);
1739	struct gfs2_holder i_gh;
1740	struct buffer_head *dibh;
1741	unsigned int size;
1742	char *buf;
1743	int error;
1744
1745	if (!dentry)
1746		return ERR_PTR(-ECHILD);
1747
1748	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1749	error = gfs2_glock_nq(&i_gh);
1750	if (error) {
1751		gfs2_holder_uninit(&i_gh);
1752		return ERR_PTR(error);
1753	}
1754
1755	size = (unsigned int)i_size_read(&ip->i_inode);
1756	if (size == 0) {
1757		gfs2_consist_inode(ip);
1758		buf = ERR_PTR(-EIO);
1759		goto out;
1760	}
1761
1762	error = gfs2_meta_inode_buffer(ip, &dibh);
1763	if (error) {
1764		buf = ERR_PTR(error);
1765		goto out;
1766	}
1767
1768	buf = kzalloc(size + 1, GFP_NOFS);
1769	if (!buf)
1770		buf = ERR_PTR(-ENOMEM);
1771	else
1772		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1773	brelse(dibh);
1774out:
1775	gfs2_glock_dq_uninit(&i_gh);
1776	if (!IS_ERR(buf))
1777		set_delayed_call(done, kfree_link, buf);
1778	return buf;
1779}
1780
1781/**
1782 * gfs2_permission -
1783 * @inode: The inode
1784 * @mask: The mask to be tested
1785 * @flags: Indicates whether this is an RCU path walk or not
1786 *
1787 * This may be called from the VFS directly, or from within GFS2 with the
1788 * inode locked, so we look to see if the glock is already locked and only
1789 * lock the glock if its not already been done.
1790 *
1791 * Returns: errno
1792 */
1793
1794int gfs2_permission(struct inode *inode, int mask)
1795{
1796	struct gfs2_inode *ip;
1797	struct gfs2_holder i_gh;
1798	int error;
1799
1800	gfs2_holder_mark_uninitialized(&i_gh);
1801	ip = GFS2_I(inode);
1802	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1803		if (mask & MAY_NOT_BLOCK)
1804			return -ECHILD;
1805		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1806		if (error)
1807			return error;
1808	}
1809
1810	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1811		error = -EPERM;
1812	else
1813		error = generic_permission(inode, mask);
1814	if (gfs2_holder_initialized(&i_gh))
1815		gfs2_glock_dq_uninit(&i_gh);
1816
1817	return error;
1818}
1819
1820static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1821{
1822	setattr_copy(inode, attr);
1823	mark_inode_dirty(inode);
1824	return 0;
1825}
1826
1827/**
1828 * gfs2_setattr_simple -
1829 * @ip:
1830 * @attr:
1831 *
1832 * Returns: errno
1833 */
1834
1835int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1836{
1837	int error;
1838
1839	if (current->journal_info)
1840		return __gfs2_setattr_simple(inode, attr);
1841
1842	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1843	if (error)
1844		return error;
1845
1846	error = __gfs2_setattr_simple(inode, attr);
1847	gfs2_trans_end(GFS2_SB(inode));
1848	return error;
1849}
1850
1851static int setattr_chown(struct inode *inode, struct iattr *attr)
1852{
1853	struct gfs2_inode *ip = GFS2_I(inode);
1854	struct gfs2_sbd *sdp = GFS2_SB(inode);
1855	kuid_t ouid, nuid;
1856	kgid_t ogid, ngid;
1857	int error;
1858	struct gfs2_alloc_parms ap;
1859
1860	ouid = inode->i_uid;
1861	ogid = inode->i_gid;
1862	nuid = attr->ia_uid;
1863	ngid = attr->ia_gid;
1864
1865	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1866		ouid = nuid = NO_UID_QUOTA_CHANGE;
1867	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1868		ogid = ngid = NO_GID_QUOTA_CHANGE;
1869
1870	error = gfs2_rsqa_alloc(ip);
1871	if (error)
1872		goto out;
1873
1874	error = gfs2_rindex_update(sdp);
1875	if (error)
1876		goto out;
1877
1878	error = gfs2_quota_lock(ip, nuid, ngid);
1879	if (error)
1880		goto out;
1881
1882	ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1883
1884	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1885	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1886		error = gfs2_quota_check(ip, nuid, ngid, &ap);
1887		if (error)
1888			goto out_gunlock_q;
1889	}
1890
1891	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1892	if (error)
1893		goto out_gunlock_q;
1894
1895	error = gfs2_setattr_simple(inode, attr);
1896	if (error)
1897		goto out_end_trans;
1898
1899	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1900	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1901		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1902		gfs2_quota_change(ip, ap.target, nuid, ngid);
1903	}
1904
1905out_end_trans:
1906	gfs2_trans_end(sdp);
1907out_gunlock_q:
1908	gfs2_quota_unlock(ip);
1909out:
1910	return error;
1911}
1912
1913/**
1914 * gfs2_setattr - Change attributes on an inode
1915 * @dentry: The dentry which is changing
1916 * @attr: The structure describing the change
1917 *
1918 * The VFS layer wants to change one or more of an inodes attributes.  Write
1919 * that change out to disk.
1920 *
1921 * Returns: errno
1922 */
1923
1924static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1925{
1926	struct inode *inode = d_inode(dentry);
1927	struct gfs2_inode *ip = GFS2_I(inode);
1928	struct gfs2_holder i_gh;
1929	int error;
1930
1931	error = gfs2_rsqa_alloc(ip);
1932	if (error)
1933		return error;
1934
1935	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1936	if (error)
1937		return error;
1938
1939	error = -EPERM;
1940	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1941		goto out;
1942
1943	error = setattr_prepare(dentry, attr);
1944	if (error)
1945		goto out;
1946
1947	if (attr->ia_valid & ATTR_SIZE)
1948		error = gfs2_setattr_size(inode, attr->ia_size);
1949	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1950		error = setattr_chown(inode, attr);
1951	else {
1952		error = gfs2_setattr_simple(inode, attr);
1953		if (!error && attr->ia_valid & ATTR_MODE)
1954			error = posix_acl_chmod(inode, inode->i_mode);
1955	}
1956
1957out:
1958	if (!error)
1959		mark_inode_dirty(inode);
1960	gfs2_glock_dq_uninit(&i_gh);
1961	return error;
1962}
1963
1964/**
1965 * gfs2_getattr - Read out an inode's attributes
1966 * @path: Object to query
1967 * @stat: The inode's stats
1968 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1969 * @flags: AT_STATX_xxx setting
1970 *
1971 * This may be called from the VFS directly, or from within GFS2 with the
1972 * inode locked, so we look to see if the glock is already locked and only
1973 * lock the glock if its not already been done. Note that its the NFS
1974 * readdirplus operation which causes this to be called (from filldir)
1975 * with the glock already held.
1976 *
1977 * Returns: errno
1978 */
1979
1980static int gfs2_getattr(const struct path *path, struct kstat *stat,
1981			u32 request_mask, unsigned int flags)
1982{
1983	struct inode *inode = d_inode(path->dentry);
1984	struct gfs2_inode *ip = GFS2_I(inode);
1985	struct gfs2_holder gh;
1986	int error;
1987
1988	gfs2_holder_mark_uninitialized(&gh);
1989	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1990		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1991		if (error)
1992			return error;
1993	}
1994
1995	generic_fillattr(inode, stat);
1996	if (gfs2_holder_initialized(&gh))
1997		gfs2_glock_dq_uninit(&gh);
1998
1999	return 0;
2000}
2001
2002static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2003		       u64 start, u64 len)
2004{
2005	struct gfs2_inode *ip = GFS2_I(inode);
2006	struct gfs2_holder gh;
2007	int ret;
2008
2009	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2010	if (ret)
2011		return ret;
2012
2013	inode_lock(inode);
2014
2015	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2016	if (ret)
2017		goto out;
2018
2019	if (gfs2_is_stuffed(ip)) {
2020		u64 phys = ip->i_no_addr << inode->i_blkbits;
2021		u64 size = i_size_read(inode);
2022		u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2023			    FIEMAP_EXTENT_DATA_INLINE;
2024		phys += sizeof(struct gfs2_dinode);
2025		phys += start;
2026		if (start + len > size)
2027			len = size - start;
2028		if (start < size)
2029			ret = fiemap_fill_next_extent(fieinfo, start, phys,
2030						      len, flags);
2031		if (ret == 1)
2032			ret = 0;
2033	} else {
2034		ret = __generic_block_fiemap(inode, fieinfo, start, len,
2035					     gfs2_block_map);
2036	}
2037
2038	gfs2_glock_dq_uninit(&gh);
2039out:
2040	inode_unlock(inode);
2041	return ret;
2042}
2043
2044const struct inode_operations gfs2_file_iops = {
2045	.permission = gfs2_permission,
2046	.setattr = gfs2_setattr,
2047	.getattr = gfs2_getattr,
2048	.listxattr = gfs2_listxattr,
2049	.fiemap = gfs2_fiemap,
2050	.get_acl = gfs2_get_acl,
2051	.set_acl = gfs2_set_acl,
2052};
2053
2054const struct inode_operations gfs2_dir_iops = {
2055	.create = gfs2_create,
2056	.lookup = gfs2_lookup,
2057	.link = gfs2_link,
2058	.unlink = gfs2_unlink,
2059	.symlink = gfs2_symlink,
2060	.mkdir = gfs2_mkdir,
2061	.rmdir = gfs2_unlink,
2062	.mknod = gfs2_mknod,
2063	.rename = gfs2_rename2,
2064	.permission = gfs2_permission,
2065	.setattr = gfs2_setattr,
2066	.getattr = gfs2_getattr,
2067	.listxattr = gfs2_listxattr,
2068	.fiemap = gfs2_fiemap,
2069	.get_acl = gfs2_get_acl,
2070	.set_acl = gfs2_set_acl,
2071	.atomic_open = gfs2_atomic_open,
2072};
2073
2074const struct inode_operations gfs2_symlink_iops = {
2075	.get_link = gfs2_get_link,
2076	.permission = gfs2_permission,
2077	.setattr = gfs2_setattr,
2078	.getattr = gfs2_getattr,
2079	.listxattr = gfs2_listxattr,
2080	.fiemap = gfs2_fiemap,
2081};
2082