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_gunlock;
1156
1157	error = gfs2_unlink_inode(dip, dentry);
1158	gfs2_trans_end(sdp);
 
1159
 
 
 
 
 
1160out_gunlock:
1161	gfs2_glock_dq(ghs + 2);
1162out_rgrp:
1163	gfs2_glock_dq(ghs + 1);
1164out_child:
1165	gfs2_glock_dq(ghs);
1166out_parent:
1167	gfs2_holder_uninit(ghs + 2);
1168out_inodes:
1169	gfs2_holder_uninit(ghs + 1);
1170	gfs2_holder_uninit(ghs);
1171	return error;
1172}
1173
1174/**
1175 * gfs2_symlink - Create a symlink
1176 * @dir: The directory to create the symlink in
1177 * @dentry: The dentry to put the symlink in
1178 * @symname: The thing which the link points to
1179 *
1180 * Returns: errno
1181 */
1182
1183static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1184			const char *symname)
1185{
 
1186	unsigned int size;
1187
1188	size = strlen(symname);
1189	if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1190		return -ENAMETOOLONG;
1191
1192	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1193}
1194
1195/**
1196 * gfs2_mkdir - Make a directory
1197 * @dir: The parent directory of the new one
1198 * @dentry: The dentry of the new directory
1199 * @mode: The mode of the new directory
1200 *
1201 * Returns: errno
1202 */
1203
1204static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1205{
1206	unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1207	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1208}
1209
1210/**
1211 * gfs2_mknod - Make a special file
1212 * @dir: The directory in which the special file will reside
1213 * @dentry: The dentry of the special file
1214 * @mode: The mode of the special file
1215 * @dev: The device specification of the special file
1216 *
1217 */
1218
1219static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1220		      dev_t dev)
1221{
1222	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1223}
1224
1225/**
1226 * gfs2_atomic_open - Atomically open a file
1227 * @dir: The directory
1228 * @dentry: The proposed new entry
1229 * @file: The proposed new struct file
1230 * @flags: open flags
1231 * @mode: File mode
1232 * @opened: Flag to say whether the file has been opened or not
1233 *
1234 * Returns: error code or 0 for success
1235 */
1236
1237static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1238			    struct file *file, unsigned flags,
1239			    umode_t mode, int *opened)
1240{
1241	struct dentry *d;
1242	bool excl = !!(flags & O_EXCL);
1243
1244	if (!d_in_lookup(dentry))
1245		goto skip_lookup;
1246
1247	d = __gfs2_lookup(dir, dentry, file, opened);
1248	if (IS_ERR(d))
1249		return PTR_ERR(d);
1250	if (d != NULL)
1251		dentry = d;
1252	if (d_really_is_positive(dentry)) {
1253		if (!(*opened & FILE_OPENED))
1254			return finish_no_open(file, d);
1255		dput(d);
1256		return 0;
1257	}
1258
1259	BUG_ON(d != NULL);
1260
1261skip_lookup:
1262	if (!(flags & O_CREAT))
1263		return -ENOENT;
1264
1265	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1266}
1267
1268/*
1269 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1270 * @this: move this
1271 * @to: to here
1272 *
1273 * Follow @to back to the root and make sure we don't encounter @this
1274 * Assumes we already hold the rename lock.
1275 *
1276 * Returns: errno
1277 */
1278
1279static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1280{
1281	struct inode *dir = &to->i_inode;
1282	struct super_block *sb = dir->i_sb;
1283	struct inode *tmp;
1284	int error = 0;
1285
1286	igrab(dir);
1287
1288	for (;;) {
1289		if (dir == &this->i_inode) {
1290			error = -EINVAL;
1291			break;
1292		}
1293		if (dir == d_inode(sb->s_root)) {
1294			error = 0;
1295			break;
1296		}
1297
1298		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1299		if (!tmp) {
1300			error = -ENOENT;
1301			break;
1302		}
1303		if (IS_ERR(tmp)) {
1304			error = PTR_ERR(tmp);
1305			break;
1306		}
1307
1308		iput(dir);
1309		dir = tmp;
1310	}
1311
1312	iput(dir);
1313
1314	return error;
1315}
1316
1317/**
1318 * update_moved_ino - Update an inode that's being moved
1319 * @ip: The inode being moved
1320 * @ndip: The parent directory of the new filename
1321 * @dir_rename: True of ip is a directory
1322 *
1323 * Returns: errno
1324 */
1325
1326static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1327			    int dir_rename)
1328{
1329	if (dir_rename)
1330		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1331
1332	ip->i_inode.i_ctime = current_time(&ip->i_inode);
1333	mark_inode_dirty_sync(&ip->i_inode);
1334	return 0;
1335}
1336
1337
1338/**
1339 * gfs2_rename - Rename a file
1340 * @odir: Parent directory of old file name
1341 * @odentry: The old dentry of the file
1342 * @ndir: Parent directory of new file name
1343 * @ndentry: The new dentry of the file
1344 *
1345 * Returns: errno
1346 */
1347
1348static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1349		       struct inode *ndir, struct dentry *ndentry)
1350{
1351	struct gfs2_inode *odip = GFS2_I(odir);
1352	struct gfs2_inode *ndip = GFS2_I(ndir);
1353	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1354	struct gfs2_inode *nip = NULL;
1355	struct gfs2_sbd *sdp = GFS2_SB(odir);
1356	struct gfs2_holder ghs[5], r_gh;
1357	struct gfs2_rgrpd *nrgd;
1358	unsigned int num_gh;
1359	int dir_rename = 0;
1360	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1361	unsigned int x;
1362	int error;
1363
1364	gfs2_holder_mark_uninitialized(&r_gh);
1365	if (d_really_is_positive(ndentry)) {
1366		nip = GFS2_I(d_inode(ndentry));
1367		if (ip == nip)
1368			return 0;
1369	}
1370
1371	error = gfs2_rindex_update(sdp);
1372	if (error)
1373		return error;
1374
1375	error = gfs2_rsqa_alloc(ndip);
1376	if (error)
1377		return error;
1378
1379	if (odip != ndip) {
1380		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1381					   0, &r_gh);
1382		if (error)
1383			goto out;
1384
1385		if (S_ISDIR(ip->i_inode.i_mode)) {
1386			dir_rename = 1;
1387			/* don't move a directory into its subdir */
1388			error = gfs2_ok_to_move(ip, ndip);
1389			if (error)
1390				goto out_gunlock_r;
1391		}
1392	}
1393
1394	num_gh = 1;
1395	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1396	if (odip != ndip) {
1397		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1398		num_gh++;
1399	}
1400	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1401	num_gh++;
1402
1403	if (nip) {
1404		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1405		num_gh++;
1406		/* grab the resource lock for unlink flag twiddling 
1407		 * this is the case of the target file already existing
1408		 * so we unlink before doing the rename
1409		 */
1410		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1411		if (nrgd)
1412			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1413	}
1414
1415	for (x = 0; x < num_gh; x++) {
1416		error = gfs2_glock_nq(ghs + x);
1417		if (error)
1418			goto out_gunlock;
1419	}
1420
1421	error = -ENOENT;
1422	if (ip->i_inode.i_nlink == 0)
1423		goto out_gunlock;
1424
1425	/* Check out the old directory */
1426
1427	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1428	if (error)
1429		goto out_gunlock;
1430
1431	/* Check out the new directory */
1432
1433	if (nip) {
1434		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1435		if (error)
1436			goto out_gunlock;
1437
1438		if (nip->i_inode.i_nlink == 0) {
1439			error = -EAGAIN;
1440			goto out_gunlock;
1441		}
1442
1443		if (S_ISDIR(nip->i_inode.i_mode)) {
1444			if (nip->i_entries < 2) {
1445				gfs2_consist_inode(nip);
1446				error = -EIO;
1447				goto out_gunlock;
1448			}
1449			if (nip->i_entries > 2) {
1450				error = -ENOTEMPTY;
1451				goto out_gunlock;
1452			}
1453		}
1454	} else {
1455		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1456		if (error)
1457			goto out_gunlock;
1458
1459		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1460		switch (error) {
1461		case -ENOENT:
1462			error = 0;
1463			break;
1464		case 0:
1465			error = -EEXIST;
1466		default:
1467			goto out_gunlock;
1468		};
1469
1470		if (odip != ndip) {
1471			if (!ndip->i_inode.i_nlink) {
1472				error = -ENOENT;
1473				goto out_gunlock;
1474			}
1475			if (ndip->i_entries == (u32)-1) {
1476				error = -EFBIG;
1477				goto out_gunlock;
1478			}
1479			if (S_ISDIR(ip->i_inode.i_mode) &&
1480			    ndip->i_inode.i_nlink == (u32)-1) {
1481				error = -EMLINK;
1482				goto out_gunlock;
1483			}
1484		}
1485	}
1486
1487	/* Check out the dir to be renamed */
1488
1489	if (dir_rename) {
1490		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1491		if (error)
1492			goto out_gunlock;
1493	}
1494
1495	if (nip == NULL) {
1496		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1497		if (error)
 
 
 
 
 
 
 
 
1498			goto out_gunlock;
1499	}
1500
1501	if (da.nr_blocks) {
1502		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1503		error = gfs2_quota_lock_check(ndip, &ap);
1504		if (error)
1505			goto out_gunlock;
1506
1507		error = gfs2_inplace_reserve(ndip, &ap);
1508		if (error)
1509			goto out_gunlock_q;
1510
1511		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1512					 4 * RES_LEAF + 4, 0);
 
 
1513		if (error)
1514			goto out_ipreserv;
1515	} else {
1516		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1517					 5 * RES_LEAF + 4, 0);
1518		if (error)
1519			goto out_gunlock;
1520	}
1521
1522	/* Remove the target file, if it exists */
1523
1524	if (nip)
1525		error = gfs2_unlink_inode(ndip, ndentry);
1526
1527	error = update_moved_ino(ip, ndip, dir_rename);
1528	if (error)
1529		goto out_end_trans;
1530
1531	error = gfs2_dir_del(odip, odentry);
1532	if (error)
1533		goto out_end_trans;
1534
1535	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1536	if (error)
1537		goto out_end_trans;
1538
1539out_end_trans:
1540	gfs2_trans_end(sdp);
1541out_ipreserv:
1542	if (da.nr_blocks)
1543		gfs2_inplace_release(ndip);
1544out_gunlock_q:
1545	if (da.nr_blocks)
1546		gfs2_quota_unlock(ndip);
1547out_gunlock:
1548	gfs2_dir_no_add(&da);
1549	while (x--) {
1550		gfs2_glock_dq(ghs + x);
1551		gfs2_holder_uninit(ghs + x);
1552	}
1553out_gunlock_r:
1554	if (gfs2_holder_initialized(&r_gh))
1555		gfs2_glock_dq_uninit(&r_gh);
1556out:
1557	return error;
1558}
1559
1560/**
1561 * gfs2_exchange - exchange two files
1562 * @odir: Parent directory of old file name
1563 * @odentry: The old dentry of the file
1564 * @ndir: Parent directory of new file name
1565 * @ndentry: The new dentry of the file
1566 * @flags: The rename flags
1567 *
1568 * Returns: errno
1569 */
1570
1571static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1572			 struct inode *ndir, struct dentry *ndentry,
1573			 unsigned int flags)
1574{
1575	struct gfs2_inode *odip = GFS2_I(odir);
1576	struct gfs2_inode *ndip = GFS2_I(ndir);
1577	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1578	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1579	struct gfs2_sbd *sdp = GFS2_SB(odir);
1580	struct gfs2_holder ghs[5], r_gh;
1581	unsigned int num_gh;
1582	unsigned int x;
1583	umode_t old_mode = oip->i_inode.i_mode;
1584	umode_t new_mode = nip->i_inode.i_mode;
1585	int error;
1586
1587	gfs2_holder_mark_uninitialized(&r_gh);
1588	error = gfs2_rindex_update(sdp);
1589	if (error)
1590		return error;
1591
1592	if (odip != ndip) {
1593		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1594					   0, &r_gh);
1595		if (error)
1596			goto out;
1597
1598		if (S_ISDIR(old_mode)) {
1599			/* don't move a directory into its subdir */
1600			error = gfs2_ok_to_move(oip, ndip);
1601			if (error)
1602				goto out_gunlock_r;
1603		}
1604
1605		if (S_ISDIR(new_mode)) {
1606			/* don't move a directory into its subdir */
1607			error = gfs2_ok_to_move(nip, odip);
1608			if (error)
1609				goto out_gunlock_r;
1610		}
1611	}
1612
1613	num_gh = 1;
1614	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1615	if (odip != ndip) {
1616		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1617		num_gh++;
1618	}
1619	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1620	num_gh++;
1621
1622	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1623	num_gh++;
1624
1625	for (x = 0; x < num_gh; x++) {
1626		error = gfs2_glock_nq(ghs + x);
1627		if (error)
1628			goto out_gunlock;
 
 
1629	}
1630
1631	error = -ENOENT;
1632	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1633		goto out_gunlock;
1634
1635	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1636	if (error)
1637		goto out_gunlock;
1638	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1639	if (error)
1640		goto out_gunlock;
1641
1642	if (S_ISDIR(old_mode)) {
1643		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1644		if (error)
1645			goto out_gunlock;
1646	}
1647	if (S_ISDIR(new_mode)) {
1648		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1649		if (error)
1650			goto out_gunlock;
 
 
 
 
1651	}
1652	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1653	if (error)
1654		goto out_gunlock;
1655
1656	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1657	if (error)
1658		goto out_end_trans;
1659
1660	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1661	if (error)
1662		goto out_end_trans;
1663
1664	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1665			       IF2DT(old_mode));
1666	if (error)
1667		goto out_end_trans;
1668
1669	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1670			       IF2DT(new_mode));
1671	if (error)
1672		goto out_end_trans;
1673
1674	if (odip != ndip) {
1675		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1676			inc_nlink(&odip->i_inode);
1677			drop_nlink(&ndip->i_inode);
1678		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1679			inc_nlink(&ndip->i_inode);
1680			drop_nlink(&odip->i_inode);
1681		}
1682	}
1683	mark_inode_dirty(&ndip->i_inode);
1684	if (odip != ndip)
1685		mark_inode_dirty(&odip->i_inode);
1686
1687out_end_trans:
1688	gfs2_trans_end(sdp);
 
 
 
 
 
 
 
 
 
1689out_gunlock:
1690	while (x--) {
1691		gfs2_glock_dq(ghs + x);
1692		gfs2_holder_uninit(ghs + x);
1693	}
1694out_gunlock_r:
1695	if (gfs2_holder_initialized(&r_gh))
1696		gfs2_glock_dq_uninit(&r_gh);
1697out:
1698	return error;
1699}
1700
1701static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1702			struct inode *ndir, struct dentry *ndentry,
1703			unsigned int flags)
1704{
1705	flags &= ~RENAME_NOREPLACE;
1706
1707	if (flags & ~RENAME_EXCHANGE)
1708		return -EINVAL;
1709
1710	if (flags & RENAME_EXCHANGE)
1711		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1712
1713	return gfs2_rename(odir, odentry, ndir, ndentry);
1714}
1715
1716/**
1717 * gfs2_get_link - Follow a symbolic link
1718 * @dentry: The dentry of the link
1719 * @inode: The inode of the link
1720 * @done: destructor for return value
1721 *
1722 * This can handle symlinks of any size.
1723 *
1724 * Returns: 0 on success or error code
1725 */
1726
1727static const char *gfs2_get_link(struct dentry *dentry,
1728				 struct inode *inode,
1729				 struct delayed_call *done)
1730{
1731	struct gfs2_inode *ip = GFS2_I(inode);
1732	struct gfs2_holder i_gh;
1733	struct buffer_head *dibh;
1734	unsigned int size;
1735	char *buf;
1736	int error;
1737
1738	if (!dentry)
1739		return ERR_PTR(-ECHILD);
1740
1741	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1742	error = gfs2_glock_nq(&i_gh);
1743	if (error) {
1744		gfs2_holder_uninit(&i_gh);
1745		return ERR_PTR(error);
 
1746	}
1747
1748	size = (unsigned int)i_size_read(&ip->i_inode);
1749	if (size == 0) {
1750		gfs2_consist_inode(ip);
1751		buf = ERR_PTR(-EIO);
1752		goto out;
1753	}
1754
1755	error = gfs2_meta_inode_buffer(ip, &dibh);
1756	if (error) {
1757		buf = ERR_PTR(error);
1758		goto out;
1759	}
1760
1761	buf = kzalloc(size + 1, GFP_NOFS);
1762	if (!buf)
1763		buf = ERR_PTR(-ENOMEM);
1764	else
1765		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1766	brelse(dibh);
1767out:
1768	gfs2_glock_dq_uninit(&i_gh);
1769	if (!IS_ERR(buf))
1770		set_delayed_call(done, kfree_link, buf);
1771	return buf;
 
 
 
 
 
 
1772}
1773
1774/**
1775 * gfs2_permission -
1776 * @inode: The inode
1777 * @mask: The mask to be tested
1778 * @flags: Indicates whether this is an RCU path walk or not
1779 *
1780 * This may be called from the VFS directly, or from within GFS2 with the
1781 * inode locked, so we look to see if the glock is already locked and only
1782 * lock the glock if its not already been done.
1783 *
1784 * Returns: errno
1785 */
1786
1787int gfs2_permission(struct inode *inode, int mask)
1788{
1789	struct gfs2_inode *ip;
1790	struct gfs2_holder i_gh;
1791	int error;
 
 
1792
1793	gfs2_holder_mark_uninitialized(&i_gh);
1794	ip = GFS2_I(inode);
1795	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1796		if (mask & MAY_NOT_BLOCK)
1797			return -ECHILD;
1798		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1799		if (error)
1800			return error;
 
1801	}
1802
1803	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1804		error = -EPERM;
1805	else
1806		error = generic_permission(inode, mask);
1807	if (gfs2_holder_initialized(&i_gh))
1808		gfs2_glock_dq_uninit(&i_gh);
1809
1810	return error;
1811}
1812
1813static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1814{
1815	setattr_copy(inode, attr);
1816	mark_inode_dirty(inode);
1817	return 0;
1818}
1819
1820/**
1821 * gfs2_setattr_simple -
1822 * @ip:
1823 * @attr:
1824 *
1825 * Returns: errno
1826 */
1827
1828int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1829{
1830	int error;
1831
1832	if (current->journal_info)
1833		return __gfs2_setattr_simple(inode, attr);
1834
1835	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1836	if (error)
1837		return error;
1838
1839	error = __gfs2_setattr_simple(inode, attr);
1840	gfs2_trans_end(GFS2_SB(inode));
1841	return error;
1842}
1843
1844static int setattr_chown(struct inode *inode, struct iattr *attr)
1845{
1846	struct gfs2_inode *ip = GFS2_I(inode);
1847	struct gfs2_sbd *sdp = GFS2_SB(inode);
1848	kuid_t ouid, nuid;
1849	kgid_t ogid, ngid;
1850	int error;
1851	struct gfs2_alloc_parms ap;
1852
1853	ouid = inode->i_uid;
1854	ogid = inode->i_gid;
1855	nuid = attr->ia_uid;
1856	ngid = attr->ia_gid;
1857
1858	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1859		ouid = nuid = NO_UID_QUOTA_CHANGE;
1860	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1861		ogid = ngid = NO_GID_QUOTA_CHANGE;
1862
1863	error = gfs2_rsqa_alloc(ip);
1864	if (error)
1865		goto out;
1866
1867	error = gfs2_rindex_update(sdp);
1868	if (error)
1869		goto out;
1870
1871	error = gfs2_quota_lock(ip, nuid, ngid);
1872	if (error)
1873		goto out;
1874
1875	ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1876
1877	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1878	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1879		error = gfs2_quota_check(ip, nuid, ngid, &ap);
1880		if (error)
1881			goto out_gunlock_q;
1882	}
1883
1884	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1885	if (error)
1886		goto out_gunlock_q;
1887
1888	error = gfs2_setattr_simple(inode, attr);
1889	if (error)
1890		goto out_end_trans;
1891
1892	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1893	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1894		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1895		gfs2_quota_change(ip, ap.target, nuid, ngid);
1896	}
1897
1898out_end_trans:
1899	gfs2_trans_end(sdp);
1900out_gunlock_q:
1901	gfs2_quota_unlock(ip);
1902out:
 
1903	return error;
1904}
1905
1906/**
1907 * gfs2_setattr - Change attributes on an inode
1908 * @dentry: The dentry which is changing
1909 * @attr: The structure describing the change
1910 *
1911 * The VFS layer wants to change one or more of an inodes attributes.  Write
1912 * that change out to disk.
1913 *
1914 * Returns: errno
1915 */
1916
1917static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1918{
1919	struct inode *inode = d_inode(dentry);
1920	struct gfs2_inode *ip = GFS2_I(inode);
1921	struct gfs2_holder i_gh;
1922	int error;
1923
1924	error = gfs2_rsqa_alloc(ip);
1925	if (error)
1926		return error;
1927
1928	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1929	if (error)
1930		return error;
1931
1932	error = -EPERM;
1933	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1934		goto out;
1935
1936	error = setattr_prepare(dentry, attr);
1937	if (error)
1938		goto out;
1939
1940	if (attr->ia_valid & ATTR_SIZE)
1941		error = gfs2_setattr_size(inode, attr->ia_size);
1942	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1943		error = setattr_chown(inode, attr);
1944	else {
 
 
1945		error = gfs2_setattr_simple(inode, attr);
1946		if (!error && attr->ia_valid & ATTR_MODE)
1947			error = posix_acl_chmod(inode, inode->i_mode);
1948	}
1949
1950out:
1951	if (!error)
1952		mark_inode_dirty(inode);
1953	gfs2_glock_dq_uninit(&i_gh);
1954	return error;
1955}
1956
1957/**
1958 * gfs2_getattr - Read out an inode's attributes
1959 * @path: Object to query
 
1960 * @stat: The inode's stats
1961 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1962 * @flags: AT_STATX_xxx setting
1963 *
1964 * This may be called from the VFS directly, or from within GFS2 with the
1965 * inode locked, so we look to see if the glock is already locked and only
1966 * lock the glock if its not already been done. Note that its the NFS
1967 * readdirplus operation which causes this to be called (from filldir)
1968 * with the glock already held.
1969 *
1970 * Returns: errno
1971 */
1972
1973static int gfs2_getattr(const struct path *path, struct kstat *stat,
1974			u32 request_mask, unsigned int flags)
1975{
1976	struct inode *inode = d_inode(path->dentry);
1977	struct gfs2_inode *ip = GFS2_I(inode);
1978	struct gfs2_holder gh;
1979	u32 gfsflags;
1980	int error;
 
1981
1982	gfs2_holder_mark_uninitialized(&gh);
1983	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1984		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1985		if (error)
1986			return error;
 
1987	}
1988
1989	gfsflags = ip->i_diskflags;
1990	if (gfsflags & GFS2_DIF_APPENDONLY)
1991		stat->attributes |= STATX_ATTR_APPEND;
1992	if (gfsflags & GFS2_DIF_IMMUTABLE)
1993		stat->attributes |= STATX_ATTR_IMMUTABLE;
1994
1995	stat->attributes_mask |= (STATX_ATTR_APPEND |
1996				  STATX_ATTR_COMPRESSED |
1997				  STATX_ATTR_ENCRYPTED |
1998				  STATX_ATTR_IMMUTABLE |
1999				  STATX_ATTR_NODUMP);
2000
2001	generic_fillattr(inode, stat);
2002
2003	if (gfs2_holder_initialized(&gh))
2004		gfs2_glock_dq_uninit(&gh);
2005
2006	return 0;
2007}
2008
2009const struct iomap_ops gfs2_iomap_ops = {
2010	.iomap_begin = gfs2_iomap_begin,
2011};
2012
2013static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2014		       u64 start, u64 len)
2015{
 
2016	struct gfs2_inode *ip = GFS2_I(inode);
2017	struct gfs2_holder gh;
2018	int ret;
2019
2020	inode_lock_shared(inode);
2021
2022	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2023	if (ret)
2024		goto out;
2025
2026	ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
 
 
2027
2028	gfs2_glock_dq_uninit(&gh);
 
 
 
 
 
 
2029
2030out:
2031	inode_unlock_shared(inode);
 
 
 
 
 
2032	return ret;
2033}
2034
2035loff_t gfs2_seek_data(struct file *file, loff_t offset)
2036{
2037	struct inode *inode = file->f_mapping->host;
2038	struct gfs2_inode *ip = GFS2_I(inode);
2039	struct gfs2_holder gh;
2040	loff_t ret;
2041
2042	inode_lock_shared(inode);
2043	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2044	if (!ret)
2045		ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2046	gfs2_glock_dq_uninit(&gh);
2047	inode_unlock_shared(inode);
2048
2049	if (ret < 0)
2050		return ret;
2051	return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
 
 
 
 
 
2052}
2053
2054loff_t gfs2_seek_hole(struct file *file, loff_t offset)
 
2055{
2056	struct inode *inode = file->f_mapping->host;
2057	struct gfs2_inode *ip = GFS2_I(inode);
2058	struct gfs2_holder gh;
2059	loff_t ret;
 
 
 
 
 
 
2060
2061	inode_lock_shared(inode);
2062	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2063	if (!ret)
2064		ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2065	gfs2_glock_dq_uninit(&gh);
2066	inode_unlock_shared(inode);
2067
2068	if (ret < 0)
2069		return ret;
2070	return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2071}
2072
2073const struct inode_operations gfs2_file_iops = {
2074	.permission = gfs2_permission,
2075	.setattr = gfs2_setattr,
2076	.getattr = gfs2_getattr,
 
 
2077	.listxattr = gfs2_listxattr,
 
2078	.fiemap = gfs2_fiemap,
2079	.get_acl = gfs2_get_acl,
2080	.set_acl = gfs2_set_acl,
2081};
2082
2083const struct inode_operations gfs2_dir_iops = {
2084	.create = gfs2_create,
2085	.lookup = gfs2_lookup,
2086	.link = gfs2_link,
2087	.unlink = gfs2_unlink,
2088	.symlink = gfs2_symlink,
2089	.mkdir = gfs2_mkdir,
2090	.rmdir = gfs2_unlink,
2091	.mknod = gfs2_mknod,
2092	.rename = gfs2_rename2,
2093	.permission = gfs2_permission,
2094	.setattr = gfs2_setattr,
2095	.getattr = gfs2_getattr,
 
 
2096	.listxattr = gfs2_listxattr,
 
2097	.fiemap = gfs2_fiemap,
2098	.get_acl = gfs2_get_acl,
2099	.set_acl = gfs2_set_acl,
2100	.atomic_open = gfs2_atomic_open,
2101};
2102
2103const struct inode_operations gfs2_symlink_iops = {
2104	.get_link = gfs2_get_link,
 
 
2105	.permission = gfs2_permission,
2106	.setattr = gfs2_setattr,
2107	.getattr = gfs2_getattr,
 
 
2108	.listxattr = gfs2_listxattr,
 
2109	.fiemap = gfs2_fiemap,
 
2110};
2111