inode.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   5 */
   6
   7#include <linux/slab.h>
   8#include <linux/spinlock.h>
   9#include <linux/completion.h>
  10#include <linux/buffer_head.h>
  11#include <linux/namei.h>
  12#include <linux/mm.h>
  13#include <linux/cred.h>
  14#include <linux/xattr.h>
  15#include <linux/posix_acl.h>
  16#include <linux/gfs2_ondisk.h>
  17#include <linux/crc32.h>
  18#include <linux/iomap.h>
  19#include <linux/security.h>
  20#include <linux/fiemap.h>
  21#include <linux/uaccess.h>
  22
  23#include "gfs2.h"
  24#include "incore.h"
  25#include "acl.h"
  26#include "bmap.h"
  27#include "dir.h"
  28#include "xattr.h"
  29#include "glock.h"
  30#include "inode.h"
  31#include "meta_io.h"
  32#include "quota.h"
  33#include "rgrp.h"
  34#include "trans.h"
  35#include "util.h"
  36#include "super.h"
  37#include "glops.h"
  38
  39static const struct inode_operations gfs2_file_iops;
  40static const struct inode_operations gfs2_dir_iops;
  41static const struct inode_operations gfs2_symlink_iops;
  42
  43/**
  44 * gfs2_set_iop - Sets inode operations
  45 * @inode: The inode with correct i_mode filled in
  46 *
  47 * GFS2 lookup code fills in vfs inode contents based on info obtained
  48 * from directory entry inside gfs2_inode_lookup().
  49 */
  50
  51static void gfs2_set_iop(struct inode *inode)
  52{
  53	struct gfs2_sbd *sdp = GFS2_SB(inode);
  54	umode_t mode = inode->i_mode;
  55
  56	if (S_ISREG(mode)) {
  57		inode->i_op = &gfs2_file_iops;
  58		if (gfs2_localflocks(sdp))
  59			inode->i_fop = &gfs2_file_fops_nolock;
  60		else
  61			inode->i_fop = &gfs2_file_fops;
  62	} else if (S_ISDIR(mode)) {
  63		inode->i_op = &gfs2_dir_iops;
  64		if (gfs2_localflocks(sdp))
  65			inode->i_fop = &gfs2_dir_fops_nolock;
  66		else
  67			inode->i_fop = &gfs2_dir_fops;
  68	} else if (S_ISLNK(mode)) {
  69		inode->i_op = &gfs2_symlink_iops;
  70	} else {
  71		inode->i_op = &gfs2_file_iops;
  72		init_special_inode(inode, inode->i_mode, inode->i_rdev);
  73	}
  74}
  75
  76static int iget_test(struct inode *inode, void *opaque)
  77{
  78	u64 no_addr = *(u64 *)opaque;
  79
  80	return GFS2_I(inode)->i_no_addr == no_addr;
  81}
  82
  83static int iget_set(struct inode *inode, void *opaque)
  84{
  85	u64 no_addr = *(u64 *)opaque;
  86
  87	GFS2_I(inode)->i_no_addr = no_addr;
  88	inode->i_ino = no_addr;
  89	return 0;
  90}
  91
  92void gfs2_setup_inode(struct inode *inode)
  93{
  94	gfp_t gfp_mask;
  95
  96	/*
  97	 * Ensure all page cache allocations are done from GFP_NOFS context to
  98	 * prevent direct reclaim recursion back into the filesystem and blowing
  99	 * stacks or deadlocking.
 100	 */
 101	gfp_mask = mapping_gfp_mask(inode->i_mapping);
 102	mapping_set_gfp_mask(inode->i_mapping, gfp_mask & ~__GFP_FS);
 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 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
 121 * if it detects that @no_formal_ino doesn't match the actual inode generation
 122 * number.  However, it doesn't always know unless @type is DT_UNKNOWN.
 123 *
 124 * Returns: A VFS inode, or an error
 125 */
 126
 127struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 128				u64 no_addr, u64 no_formal_ino,
 129				unsigned int blktype)
 130{
 131	struct inode *inode;
 132	struct gfs2_inode *ip;
 133	struct gfs2_holder i_gh;
 134	int error;
 135
 136	gfs2_holder_mark_uninitialized(&i_gh);
 137	inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
 138	if (!inode)
 139		return ERR_PTR(-ENOMEM);
 140
 141	ip = GFS2_I(inode);
 142
 143	if (inode_state_read_once(inode) & I_NEW) {
 144		struct gfs2_sbd *sdp = GFS2_SB(inode);
 145		struct gfs2_glock *io_gl;
 146		int extra_flags = 0;
 147
 148		gfs2_setup_inode(inode);
 149		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
 150				       &ip->i_gl);
 151		if (unlikely(error))
 152			goto fail;
 153
 154		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
 155				       &io_gl);
 156		if (unlikely(error))
 157			goto fail;
 158
 159		/*
 160		 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
 161		 * delete_work_func().  Make sure not to cancel the delete work
 162		 * from within itself here.
 163		 */
 164		if (blktype == GFS2_BLKST_UNLINKED)
 165			extra_flags |= LM_FLAG_TRY;
 166		else
 167			gfs2_cancel_delete_work(io_gl);
 168		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
 169					   GL_EXACT | GL_NOPID | extra_flags,
 170					   &ip->i_iopen_gh);
 171		gfs2_glock_put(io_gl);
 172		if (unlikely(error))
 173			goto fail;
 174
 175		if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
 176			/*
 177			 * The GL_SKIP flag indicates to skip reading the inode
 178			 * block.  We read the inode when instantiating it
 179			 * after possibly checking the block type.
 180			 */
 181			error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
 182						   GL_SKIP, &i_gh);
 183			if (error)
 184				goto fail;
 185
 186			error = -ESTALE;
 187			if (no_formal_ino &&
 188			    gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
 189				goto fail;
 190
 191			if (blktype != GFS2_BLKST_FREE) {
 192				error = gfs2_check_blk_type(sdp, no_addr,
 193							    blktype);
 194				if (error)
 195					goto fail;
 196			}
 197		}
 198
 199		set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
 200
 201		/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
 202		inode_set_atime(inode,
 203				1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1),
 204				0);
 205
 206		glock_set_object(ip->i_gl, ip);
 207
 208		if (type == DT_UNKNOWN) {
 209			/* Inode glock must be locked already */
 210			error = gfs2_instantiate(&i_gh);
 211			if (error) {
 212				glock_clear_object(ip->i_gl, ip);
 213				goto fail;
 214			}
 215		} else {
 216			ip->i_no_formal_ino = no_formal_ino;
 217			inode->i_mode = DT2IF(type);
 218		}
 219
 220		if (gfs2_holder_initialized(&i_gh))
 221			gfs2_glock_dq_uninit(&i_gh);
 222		glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 223
 224		gfs2_set_iop(inode);
 225		unlock_new_inode(inode);
 226	}
 227
 228	if (no_formal_ino && ip->i_no_formal_ino &&
 229	    no_formal_ino != ip->i_no_formal_ino) {
 230		iput(inode);
 231		return ERR_PTR(-ESTALE);
 232	}
 233
 234	return inode;
 235
 236fail:
 237	if (error == GLR_TRYFAILED)
 238		error = -EAGAIN;
 239	if (gfs2_holder_initialized(&ip->i_iopen_gh))
 240		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 241	if (gfs2_holder_initialized(&i_gh))
 242		gfs2_glock_dq_uninit(&i_gh);
 243	if (ip->i_gl) {
 244		gfs2_glock_put(ip->i_gl);
 245		ip->i_gl = NULL;
 246	}
 247	iget_failed(inode);
 248	return ERR_PTR(error);
 249}
 250
 251/**
 252 * gfs2_lookup_by_inum - look up an inode by inode number
 253 * @sdp: The super block
 254 * @no_addr: The inode number
 255 * @no_formal_ino: The inode generation number (0 for any)
 256 * @blktype: Requested block type (see gfs2_inode_lookup)
 257 */
 258struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 259				  u64 no_formal_ino, unsigned int blktype)
 260{
 261	struct super_block *sb = sdp->sd_vfs;
 262	struct inode *inode;
 263	int error;
 264
 265	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
 266				  blktype);
 267	if (IS_ERR(inode))
 268		return inode;
 269
 270	if (no_formal_ino) {
 271		error = -EIO;
 272		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
 273			goto fail_iput;
 274	}
 275	return inode;
 276
 277fail_iput:
 278	iput(inode);
 279	return ERR_PTR(error);
 280}
 281
 282
 283/**
 284 * gfs2_lookup_meta - Look up an inode in a metadata directory
 285 * @dip: The directory
 286 * @name: The name of the inode
 287 */
 288struct inode *gfs2_lookup_meta(struct inode *dip, const char *name)
 289{
 290	struct qstr qstr;
 291	struct inode *inode;
 292
 293	gfs2_str2qstr(&qstr, name);
 294	inode = gfs2_lookupi(dip, &qstr, 1);
 295	if (IS_ERR_OR_NULL(inode))
 296		return inode ? inode : ERR_PTR(-ENOENT);
 297
 298	/*
 299	 * Must not call back into the filesystem when allocating
 300	 * pages in the metadata inode's address space.
 301	 */
 302	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 303
 304	return inode;
 305}
 306
 307
 308/**
 309 * gfs2_lookupi - Look up a filename in a directory and return its inode
 310 * @dir: The inode of the directory containing the inode to look-up
 311 * @name: The name of the inode to look for
 312 * @is_root: If 1, ignore the caller's permissions
 313 *
 314 * This can be called via the VFS filldir function when NFS is doing
 315 * a readdirplus and the inode which its intending to stat isn't
 316 * already in cache. In this case we must not take the directory glock
 317 * again, since the readdir call will have already taken that lock.
 318 *
 319 * Returns: errno
 320 */
 321
 322struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 323			   int is_root)
 324{
 325	struct super_block *sb = dir->i_sb;
 326	struct gfs2_inode *dip = GFS2_I(dir);
 327	struct gfs2_holder d_gh;
 328	int error = 0;
 329	struct inode *inode = NULL;
 330
 331	gfs2_holder_mark_uninitialized(&d_gh);
 332	if (!name->len || name->len > GFS2_FNAMESIZE)
 333		return ERR_PTR(-ENAMETOOLONG);
 334
 335	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
 336	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
 337	     dir == d_inode(sb->s_root))) {
 338		igrab(dir);
 339		return dir;
 340	}
 341
 342	if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
 343		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 344		if (error)
 345			return ERR_PTR(error);
 346	}
 347
 348	if (!is_root) {
 349		error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC);
 350		if (error)
 351			goto out;
 352	}
 353
 354	inode = gfs2_dir_search(dir, name, false);
 355	if (IS_ERR(inode))
 356		error = PTR_ERR(inode);
 357out:
 358	if (gfs2_holder_initialized(&d_gh))
 359		gfs2_glock_dq_uninit(&d_gh);
 360	if (error == -ENOENT)
 361		return NULL;
 362	return inode ? inode : ERR_PTR(error);
 363}
 364
 365/**
 366 * create_ok - OK to create a new on-disk inode here?
 367 * @dip:  Directory in which dinode is to be created
 368 * @name:  Name of new dinode
 369 * @mode:
 370 *
 371 * Returns: errno
 372 */
 373
 374static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 375		     umode_t mode)
 376{
 377	int error;
 378
 379	error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
 380				MAY_WRITE | MAY_EXEC);
 381	if (error)
 382		return error;
 383
 384	/*  Don't create entries in an unlinked directory  */
 385	if (!dip->i_inode.i_nlink)
 386		return -ENOENT;
 387
 388	if (dip->i_entries == (u32)-1)
 389		return -EFBIG;
 390	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
 391		return -EMLINK;
 392
 393	return 0;
 394}
 395
 396static void munge_mode_uid_gid(const struct gfs2_inode *dip,
 397			       struct inode *inode)
 398{
 399	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
 400	    (dip->i_inode.i_mode & S_ISUID) &&
 401	    !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
 402		if (S_ISDIR(inode->i_mode))
 403			inode->i_mode |= S_ISUID;
 404		else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
 405			inode->i_mode &= ~07111;
 406		inode->i_uid = dip->i_inode.i_uid;
 407	} else
 408		inode->i_uid = current_fsuid();
 409
 410	if (dip->i_inode.i_mode & S_ISGID) {
 411		if (S_ISDIR(inode->i_mode))
 412			inode->i_mode |= S_ISGID;
 413		inode->i_gid = dip->i_inode.i_gid;
 414	} else
 415		inode->i_gid = current_fsgid();
 416}
 417
 418static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
 419{
 420	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 421	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
 422	int error;
 423
 424	error = gfs2_quota_lock_check(ip, &ap);
 425	if (error)
 426		goto out;
 427
 428	error = gfs2_inplace_reserve(ip, &ap);
 429	if (error)
 430		goto out_quota;
 431
 432	error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
 433	if (error)
 434		goto out_ipreserv;
 435
 436	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1);
 437	if (error)
 438		goto out_trans_end;
 439
 440	ip->i_no_formal_ino = ip->i_generation;
 441	ip->i_inode.i_ino = ip->i_no_addr;
 442	ip->i_goal = ip->i_no_addr;
 443	if (*dblocks > 1)
 444		ip->i_eattr = ip->i_no_addr + 1;
 445
 446out_trans_end:
 447	gfs2_trans_end(sdp);
 448out_ipreserv:
 449	gfs2_inplace_release(ip);
 450out_quota:
 451	gfs2_quota_unlock(ip);
 452out:
 453	return error;
 454}
 455
 456static void gfs2_final_release_pages(struct gfs2_inode *ip)
 457{
 458	struct inode *inode = &ip->i_inode;
 459	struct gfs2_glock *gl = ip->i_gl;
 460
 461	/* This can only happen during incomplete inode creation. */
 462	if (unlikely(!gl))
 463		return;
 464
 465	truncate_inode_pages(gfs2_glock2aspace(gl), 0);
 466	truncate_inode_pages(&inode->i_data, 0);
 467
 468	if (atomic_read(&gl->gl_revokes) == 0) {
 469		clear_bit(GLF_LFLUSH, &gl->gl_flags);
 470		clear_bit(GLF_DIRTY, &gl->gl_flags);
 471	}
 472}
 473
 474int gfs2_dinode_dealloc(struct gfs2_inode *ip)
 475{
 476	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 477	struct gfs2_rgrpd *rgd;
 478	struct gfs2_holder gh;
 479	int error;
 480
 481	if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
 482		gfs2_consist_inode(ip);
 483		return -EIO;
 484	}
 485
 486	gfs2_rindex_update(sdp);
 487
 488	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 489	if (error)
 490		return error;
 491
 492	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
 493	if (!rgd) {
 494		gfs2_consist_inode(ip);
 495		error = -EIO;
 496		goto out_qs;
 497	}
 498
 499	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
 500				   LM_FLAG_NODE_SCOPE, &gh);
 501	if (error)
 502		goto out_qs;
 503
 504	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
 505				 sdp->sd_jdesc->jd_blocks);
 506	if (error)
 507		goto out_rg_gunlock;
 508
 509	gfs2_free_di(rgd, ip);
 510
 511	gfs2_final_release_pages(ip);
 512
 513	gfs2_trans_end(sdp);
 514
 515out_rg_gunlock:
 516	gfs2_glock_dq_uninit(&gh);
 517out_qs:
 518	gfs2_quota_unhold(ip);
 519	return error;
 520}
 521
 522static void gfs2_init_dir(struct buffer_head *dibh,
 523			  const struct gfs2_inode *parent)
 524{
 525	struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 526	struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 527
 528	gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
 529	dent->de_inum = di->di_num; /* already GFS2 endian */
 530	dent->de_type = cpu_to_be16(DT_DIR);
 531
 532	dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 533	gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 534	gfs2_inum_out(parent, dent);
 535	dent->de_type = cpu_to_be16(DT_DIR);
 536	
 537}
 538
 539/**
 540 * gfs2_init_xattr - Initialise an xattr block for a new inode
 541 * @ip: The inode in question
 542 *
 543 * This sets up an empty xattr block for a new inode, ready to
 544 * take any ACLs, LSM xattrs, etc.
 545 */
 546
 547static void gfs2_init_xattr(struct gfs2_inode *ip)
 548{
 549	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 550	struct buffer_head *bh;
 551	struct gfs2_ea_header *ea;
 552
 553	bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
 554	gfs2_trans_add_meta(ip->i_gl, bh);
 555	gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 556	gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
 557
 558	ea = GFS2_EA_BH2FIRST(bh);
 559	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 560	ea->ea_type = GFS2_EATYPE_UNUSED;
 561	ea->ea_flags = GFS2_EAFLAG_LAST;
 562
 563	brelse(bh);
 564}
 565
 566/**
 567 * init_dinode - Fill in a new dinode structure
 568 * @dip: The directory this inode is being created in
 569 * @ip: The inode
 570 * @symname: The symlink destination (if a symlink)
 571 *
 572 */
 573
 574static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
 575			const char *symname)
 576{
 577	struct gfs2_dinode *di;
 578	struct buffer_head *dibh;
 579
 580	dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
 581	gfs2_trans_add_meta(ip->i_gl, dibh);
 582	di = (struct gfs2_dinode *)dibh->b_data;
 583	gfs2_dinode_out(ip, di);
 584
 585	di->di_major = cpu_to_be32(imajor(&ip->i_inode));
 586	di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
 587	di->__pad1 = 0;
 588	di->__pad2 = 0;
 589	di->__pad3 = 0;
 590	memset(&di->__pad4, 0, sizeof(di->__pad4));
 591	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
 592	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 593
 594	switch(ip->i_inode.i_mode & S_IFMT) {
 595	case S_IFDIR:
 596		gfs2_init_dir(dibh, dip);
 597		break;
 598	case S_IFLNK:
 599		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
 600		break;
 601	}
 602
 603	set_buffer_uptodate(dibh);
 604	brelse(dibh);
 605}
 606
 607/**
 608 * gfs2_trans_da_blks - Calculate number of blocks to link inode
 609 * @dip: The directory we are linking into
 610 * @da: The dir add information
 611 * @nr_inodes: The number of inodes involved
 612 *
 613 * This calculate the number of blocks we need to reserve in a
 614 * transaction to link @nr_inodes into a directory. In most cases
 615 * @nr_inodes will be 2 (the directory plus the inode being linked in)
 616 * but in case of rename, 4 may be required.
 617 *
 618 * Returns: Number of blocks
 619 */
 620
 621static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
 622				   const struct gfs2_diradd *da,
 623				   unsigned nr_inodes)
 624{
 625	return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
 626	       (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
 627}
 628
 629static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 630		       struct gfs2_inode *ip, struct gfs2_diradd *da)
 631{
 632	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 633	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
 634	int error;
 635
 636	if (da->nr_blocks) {
 637		error = gfs2_quota_lock_check(dip, &ap);
 638		if (error)
 639			goto fail_quota_locks;
 640
 641		error = gfs2_inplace_reserve(dip, &ap);
 642		if (error)
 643			goto fail_quota_locks;
 644
 645		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
 646		if (error)
 647			goto fail_ipreserv;
 648	} else {
 649		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
 650		if (error)
 651			goto fail_quota_locks;
 652	}
 653
 654	error = gfs2_dir_add(&dip->i_inode, name, ip, da);
 655
 656	gfs2_trans_end(sdp);
 657fail_ipreserv:
 658	gfs2_inplace_release(dip);
 659fail_quota_locks:
 660	gfs2_quota_unlock(dip);
 661	return error;
 662}
 663
 664static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 665		    void *fs_info)
 666{
 667	const struct xattr *xattr;
 668	int err = 0;
 669
 670	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 671		err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
 672				       xattr->value_len, 0,
 673				       GFS2_EATYPE_SECURITY);
 674		if (err < 0)
 675			break;
 676	}
 677	return err;
 678}
 679
 680/**
 681 * gfs2_create_inode - Create a new inode
 682 * @dir: The parent directory
 683 * @dentry: The new dentry
 684 * @file: If non-NULL, the file which is being opened
 685 * @mode: The permissions on the new inode
 686 * @dev: For device nodes, this is the device number
 687 * @symname: For symlinks, this is the link destination
 688 * @size: The initial size of the inode (ignored for directories)
 689 * @excl: Force fail if inode exists
 690 *
 691 * FIXME: Change to allocate the disk blocks and write them out in the same
 692 * transaction.  That way, we can no longer end up in a situation in which an
 693 * inode is allocated, the node crashes, and the block looks like a valid
 694 * inode.  (With atomic creates in place, we will also no longer need to zero
 695 * the link count and dirty the inode here on failure.)
 696 *
 697 * Returns: 0 on success, or error code
 698 */
 699
 700static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 701			     struct file *file,
 702			     umode_t mode, dev_t dev, const char *symname,
 703			     unsigned int size, int excl)
 704{
 705	const struct qstr *name = &dentry->d_name;
 706	struct posix_acl *default_acl, *acl;
 707	struct gfs2_holder d_gh, gh;
 708	struct inode *inode = NULL;
 709	struct gfs2_inode *dip = GFS2_I(dir), *ip;
 710	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 711	struct gfs2_glock *io_gl;
 712	int error, dealloc_error;
 713	u32 aflags = 0;
 714	unsigned blocks = 1;
 715	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 716	bool xattr_initialized = false;
 717
 718	if (!name->len || name->len > GFS2_FNAMESIZE)
 719		return -ENAMETOOLONG;
 720
 721	error = gfs2_qa_get(dip);
 722	if (error)
 723		return error;
 724
 725	error = gfs2_rindex_update(sdp);
 726	if (error)
 727		goto fail;
 728
 729	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
 730	if (error)
 731		goto fail;
 732	gfs2_holder_mark_uninitialized(&gh);
 733
 734	error = create_ok(dip, name, mode);
 735	if (error)
 736		goto fail_gunlock;
 737
 738	inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
 739	error = PTR_ERR(inode);
 740	if (!IS_ERR(inode)) {
 741		if (S_ISDIR(inode->i_mode)) {
 742			iput(inode);
 743			inode = NULL;
 744			error = -EISDIR;
 745			goto fail_gunlock;
 746		}
 747		d_instantiate(dentry, inode);
 748		error = 0;
 749		if (file) {
 750			if (S_ISREG(inode->i_mode))
 751				error = finish_open(file, dentry, gfs2_open_common);
 752			else
 753				error = finish_no_open(file, NULL);
 754		}
 755		gfs2_glock_dq_uninit(&d_gh);
 756		goto fail;
 757	} else if (error != -ENOENT) {
 758		goto fail_gunlock;
 759	}
 760
 761	error = gfs2_diradd_alloc_required(dir, name, &da);
 762	if (error < 0)
 763		goto fail_gunlock;
 764
 765	inode = new_inode(sdp->sd_vfs);
 766	error = -ENOMEM;
 767	if (!inode)
 768		goto fail_gunlock;
 769	gfs2_setup_inode(inode);
 770	ip = GFS2_I(inode);
 771
 772	error = posix_acl_create(dir, &mode, &default_acl, &acl);
 773	if (error)
 774		goto fail_gunlock;
 775
 776	error = gfs2_qa_get(ip);
 777	if (error)
 778		goto fail_free_acls;
 779
 780	inode->i_mode = mode;
 781	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
 782	inode->i_rdev = dev;
 783	inode->i_size = size;
 784	simple_inode_init_ts(inode);
 785	munge_mode_uid_gid(dip, inode);
 786	check_and_update_goal(dip);
 787	ip->i_goal = dip->i_goal;
 788	ip->i_diskflags = 0;
 789	ip->i_eattr = 0;
 790	ip->i_height = 0;
 791	ip->i_depth = 0;
 792	ip->i_entries = 0;
 793	ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
 794
 795	switch(mode & S_IFMT) {
 796	case S_IFREG:
 797		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
 798		    gfs2_tune_get(sdp, gt_new_files_jdata))
 799			ip->i_diskflags |= GFS2_DIF_JDATA;
 800		gfs2_set_aops(inode);
 801		break;
 802	case S_IFDIR:
 803		ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
 804		ip->i_diskflags |= GFS2_DIF_JDATA;
 805		ip->i_entries = 2;
 806		break;
 807	}
 808
 809	/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
 810	if (dip->i_diskflags & GFS2_DIF_SYSTEM)
 811		ip->i_diskflags |= GFS2_DIF_SYSTEM;
 812
 813	gfs2_set_inode_flags(inode);
 814
 815	if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
 816	    (dip->i_diskflags & GFS2_DIF_TOPDIR))
 817		aflags |= GFS2_AF_ORLOV;
 818
 819	if (default_acl || acl)
 820		blocks++;
 821
 822	error = alloc_dinode(ip, aflags, &blocks);
 823	if (error)
 824		goto fail_free_inode;
 825
 826	gfs2_set_inode_blocks(inode, blocks);
 827
 828	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 829	if (error)
 830		goto fail_dealloc_inode;
 831
 832	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 833	if (error)
 834		goto fail_dealloc_inode;
 835	gfs2_cancel_delete_work(io_gl);
 836	io_gl->gl_no_formal_ino = ip->i_no_formal_ino;
 837
 838retry:
 839	error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
 840	if (error == -EBUSY)
 841		goto retry;
 842	if (error)
 843		goto fail_gunlock2;
 844
 845	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
 846				   &ip->i_iopen_gh);
 847	if (error)
 848		goto fail_gunlock2;
 849
 850	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
 851	if (error)
 852		goto fail_gunlock3;
 853	clear_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
 854
 855	error = gfs2_trans_begin(sdp, blocks, 0);
 856	if (error)
 857		goto fail_gunlock3;
 858
 859	if (blocks > 1) {
 860		gfs2_init_xattr(ip);
 861		xattr_initialized = true;
 862	}
 863	init_dinode(dip, ip, symname);
 864	gfs2_trans_end(sdp);
 865
 866	glock_set_object(ip->i_gl, ip);
 867	glock_set_object(io_gl, ip);
 868	gfs2_set_iop(inode);
 869
 870	if (default_acl) {
 871		error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 872		if (error)
 873			goto fail_gunlock4;
 874		posix_acl_release(default_acl);
 875		default_acl = NULL;
 876	}
 877	if (acl) {
 878		error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
 879		if (error)
 880			goto fail_gunlock4;
 881		posix_acl_release(acl);
 882		acl = NULL;
 883	}
 884
 885	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
 886					     &gfs2_initxattrs, NULL);
 887	if (error)
 888		goto fail_gunlock4;
 889
 890	error = link_dinode(dip, name, ip, &da);
 891	if (error)
 892		goto fail_gunlock4;
 893
 894	mark_inode_dirty(inode);
 895	d_instantiate(dentry, inode);
 896	/* After instantiate, errors should result in evict which will destroy
 897	 * both inode and iopen glocks properly. */
 898	if (file) {
 899		file->f_mode |= FMODE_CREATED;
 900		error = finish_open(file, dentry, gfs2_open_common);
 901	}
 902	gfs2_glock_dq_uninit(&d_gh);
 903	gfs2_qa_put(ip);
 904	gfs2_glock_dq_uninit(&gh);
 905	gfs2_glock_put(io_gl);
 906	gfs2_qa_put(dip);
 907	unlock_new_inode(inode);
 908	return error;
 909
 910fail_gunlock4:
 911	glock_clear_object(ip->i_gl, ip);
 912	glock_clear_object(io_gl, ip);
 913fail_gunlock3:
 914	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 915fail_gunlock2:
 916	gfs2_glock_put(io_gl);
 917fail_dealloc_inode:
 918	dealloc_error = 0;
 919	if (ip->i_eattr)
 920		dealloc_error = gfs2_ea_dealloc(ip, xattr_initialized);
 921	clear_nlink(inode);
 922	mark_inode_dirty(inode);
 923	if (!dealloc_error)
 924		dealloc_error = gfs2_dinode_dealloc(ip);
 925	if (dealloc_error)
 926		fs_warn(sdp, "%s: %d\n", __func__, dealloc_error);
 927	ip->i_no_addr = 0;
 928fail_free_inode:
 929	if (ip->i_gl) {
 930		gfs2_glock_put(ip->i_gl);
 931		ip->i_gl = NULL;
 932	}
 933	gfs2_rs_deltree(&ip->i_res);
 934	gfs2_qa_put(ip);
 935fail_free_acls:
 936	posix_acl_release(default_acl);
 937	posix_acl_release(acl);
 938fail_gunlock:
 939	gfs2_dir_no_add(&da);
 940	gfs2_glock_dq_uninit(&d_gh);
 941	if (!IS_ERR_OR_NULL(inode)) {
 942		if (inode_state_read_once(inode) & I_NEW)
 943			iget_failed(inode);
 944		else
 945			iput(inode);
 946	}
 947	if (gfs2_holder_initialized(&gh))
 948		gfs2_glock_dq_uninit(&gh);
 949fail:
 950	gfs2_qa_put(dip);
 951	return error;
 952}
 953
 954/**
 955 * gfs2_create - Create a file
 956 * @idmap: idmap of the mount the inode was found from
 957 * @dir: The directory in which to create the file
 958 * @dentry: The dentry of the new file
 959 * @mode: The mode of the new file
 960 * @excl: Force fail if inode exists
 961 *
 962 * Returns: errno
 963 */
 964
 965static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
 966		       struct dentry *dentry, umode_t mode, bool excl)
 967{
 968	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
 969}
 970
 971/**
 972 * __gfs2_lookup - Look up a filename in a directory and return its inode
 973 * @dir: The directory inode
 974 * @dentry: The dentry of the new inode
 975 * @file: File to be opened
 976 *
 977 *
 978 * Returns: errno
 979 */
 980
 981static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 982				    struct file *file)
 983{
 984	struct inode *inode;
 985	struct dentry *d;
 986	struct gfs2_holder gh;
 987	struct gfs2_glock *gl;
 988	int error;
 989
 990	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 991	if (inode == NULL) {
 992		d_add(dentry, NULL);
 993		return NULL;
 994	}
 995	if (IS_ERR(inode))
 996		return ERR_CAST(inode);
 997
 998	gl = GFS2_I(inode)->i_gl;
 999	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1000	if (error) {
1001		iput(inode);
1002		return ERR_PTR(error);
1003	}
1004
1005	d = d_splice_alias(inode, dentry);
1006	if (IS_ERR(d)) {
1007		gfs2_glock_dq_uninit(&gh);
1008		return d;
1009	}
1010	if (file && S_ISREG(inode->i_mode))
1011		error = finish_open(file, dentry, gfs2_open_common);
1012
1013	gfs2_glock_dq_uninit(&gh);
1014	if (error) {
1015		dput(d);
1016		return ERR_PTR(error);
1017	}
1018	return d;
1019}
1020
1021static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
1022				  unsigned flags)
1023{
1024	return __gfs2_lookup(dir, dentry, NULL);
1025}
1026
1027/**
1028 * gfs2_link - Link to a file
1029 * @old_dentry: The inode to link
1030 * @dir: Add link to this directory
1031 * @dentry: The name of the link
1032 *
1033 * Link the inode in "old_dentry" into the directory "dir" with the
1034 * name in "dentry".
1035 *
1036 * Returns: errno
1037 */
1038
1039static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
1040		     struct dentry *dentry)
1041{
1042	struct gfs2_inode *dip = GFS2_I(dir);
1043	struct gfs2_sbd *sdp = GFS2_SB(dir);
1044	struct inode *inode = d_inode(old_dentry);
1045	struct gfs2_inode *ip = GFS2_I(inode);
1046	struct gfs2_holder d_gh, gh;
1047	struct buffer_head *dibh;
1048	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
1049	int error;
1050
1051	if (S_ISDIR(inode->i_mode))
1052		return -EPERM;
1053
1054	error = gfs2_qa_get(dip);
1055	if (error)
1056		return error;
1057
1058	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1059	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1060
1061	error = gfs2_glock_nq(&d_gh);
1062	if (error)
1063		goto out_parent;
1064
1065	error = gfs2_glock_nq(&gh);
1066	if (error)
1067		goto out_child;
1068
1069	error = -ENOENT;
1070	if (inode->i_nlink == 0)
1071		goto out_gunlock;
1072
1073	error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC);
1074	if (error)
1075		goto out_gunlock;
1076
1077	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
1078	switch (error) {
1079	case -ENOENT:
1080		break;
1081	case 0:
1082		error = -EEXIST;
1083		goto out_gunlock;
1084	default:
1085		goto out_gunlock;
1086	}
1087
1088	error = -EINVAL;
1089	if (!dip->i_inode.i_nlink)
1090		goto out_gunlock;
1091	error = -EFBIG;
1092	if (dip->i_entries == (u32)-1)
1093		goto out_gunlock;
1094	error = -EPERM;
1095	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1096		goto out_gunlock;
1097	error = -EMLINK;
1098	if (ip->i_inode.i_nlink == (u32)-1)
1099		goto out_gunlock;
1100
1101	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
1102	if (error < 0)
1103		goto out_gunlock;
1104
1105	if (da.nr_blocks) {
1106		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1107		error = gfs2_quota_lock_check(dip, &ap);
1108		if (error)
1109			goto out_gunlock;
1110
1111		error = gfs2_inplace_reserve(dip, &ap);
1112		if (error)
1113			goto out_gunlock_q;
1114
1115		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1116		if (error)
1117			goto out_ipres;
1118	} else {
1119		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1120		if (error)
1121			goto out_ipres;
1122	}
1123
1124	error = gfs2_meta_inode_buffer(ip, &dibh);
1125	if (error)
1126		goto out_end_trans;
1127
1128	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1129	if (error)
1130		goto out_brelse;
1131
1132	gfs2_trans_add_meta(ip->i_gl, dibh);
1133	inc_nlink(&ip->i_inode);
1134	inode_set_ctime_current(&ip->i_inode);
1135	ihold(inode);
1136	d_instantiate(dentry, inode);
1137	mark_inode_dirty(inode);
1138
1139out_brelse:
1140	brelse(dibh);
1141out_end_trans:
1142	gfs2_trans_end(sdp);
1143out_ipres:
1144	if (da.nr_blocks)
1145		gfs2_inplace_release(dip);
1146out_gunlock_q:
1147	if (da.nr_blocks)
1148		gfs2_quota_unlock(dip);
1149out_gunlock:
1150	gfs2_dir_no_add(&da);
1151	gfs2_glock_dq(&gh);
1152out_child:
1153	gfs2_glock_dq(&d_gh);
1154out_parent:
1155	gfs2_qa_put(dip);
1156	gfs2_holder_uninit(&d_gh);
1157	gfs2_holder_uninit(&gh);
1158	return error;
1159}
1160
1161/*
1162 * gfs2_unlink_ok - check to see that a inode is still in a directory
1163 * @dip: the directory
1164 * @name: the name of the file
1165 * @ip: the inode
1166 *
1167 * Assumes that the lock on (at least) @dip is held.
1168 *
1169 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1170 */
1171
1172static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1173			  const struct gfs2_inode *ip)
1174{
1175	int error;
1176
1177	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1178		return -EPERM;
1179
1180	if ((dip->i_inode.i_mode & S_ISVTX) &&
1181	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1182	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1183		return -EPERM;
1184
1185	if (IS_APPEND(&dip->i_inode))
1186		return -EPERM;
1187
1188	error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
1189				MAY_WRITE | MAY_EXEC);
1190	if (error)
1191		return error;
1192
1193	return gfs2_dir_check(&dip->i_inode, name, ip);
1194}
1195
1196/**
1197 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1198 * @dip: The parent directory
1199 * @dentry: The dentry to unlink
1200 *
1201 * Called with all the locks and in a transaction. This will only be
1202 * called for a directory after it has been checked to ensure it is empty.
1203 *
1204 * Returns: 0 on success, or an error
1205 */
1206
1207static int gfs2_unlink_inode(struct gfs2_inode *dip,
1208			     const struct dentry *dentry)
1209{
1210	struct inode *inode = d_inode(dentry);
1211	struct gfs2_inode *ip = GFS2_I(inode);
1212	int error;
1213
1214	error = gfs2_dir_del(dip, dentry);
1215	if (error)
1216		return error;
1217
1218	ip->i_entries = 0;
1219	inode_set_ctime_current(inode);
1220	if (S_ISDIR(inode->i_mode))
1221		clear_nlink(inode);
1222	else
1223		drop_nlink(inode);
1224	mark_inode_dirty(inode);
1225	if (inode->i_nlink == 0)
1226		gfs2_unlink_di(inode);
1227	return 0;
1228}
1229
1230
1231/**
1232 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1233 * @dir: The inode of the directory containing the inode to unlink
1234 * @dentry: The file itself
1235 *
1236 * This routine uses the type of the inode as a flag to figure out
1237 * whether this is an unlink or an rmdir.
1238 *
1239 * Returns: errno
1240 */
1241
1242static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1243{
1244	struct gfs2_inode *dip = GFS2_I(dir);
1245	struct gfs2_sbd *sdp = GFS2_SB(dir);
1246	struct inode *inode = d_inode(dentry);
1247	struct gfs2_inode *ip = GFS2_I(inode);
1248	struct gfs2_holder d_gh, r_gh, gh;
1249	struct gfs2_rgrpd *rgd;
1250	int error;
1251
1252	error = gfs2_rindex_update(sdp);
1253	if (error)
1254		return error;
1255
1256	error = -EROFS;
1257
1258	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1259	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, &gh);
1260
1261	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1262	if (!rgd)
1263		goto out_inodes;
1264
1265	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh);
1266
1267
1268	error = gfs2_glock_nq(&d_gh);
1269	if (error)
1270		goto out_parent;
1271
1272	error = gfs2_glock_nq(&gh);
1273	if (error)
1274		goto out_child;
1275
1276	error = -ENOENT;
1277	if (inode->i_nlink == 0)
1278		goto out_rgrp;
1279
1280	if (S_ISDIR(inode->i_mode)) {
1281		error = -ENOTEMPTY;
1282		if (ip->i_entries > 2 || inode->i_nlink > 2)
1283			goto out_rgrp;
1284	}
1285
1286	error = gfs2_glock_nq(&r_gh); /* rgrp */
1287	if (error)
1288		goto out_rgrp;
1289
1290	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1291	if (error)
1292		goto out_gunlock;
1293
1294	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1295	if (error)
1296		goto out_gunlock;
1297
1298	error = gfs2_unlink_inode(dip, dentry);
1299	gfs2_trans_end(sdp);
1300
1301out_gunlock:
1302	gfs2_glock_dq(&r_gh);
1303out_rgrp:
1304	gfs2_glock_dq(&gh);
1305out_child:
1306	gfs2_glock_dq(&d_gh);
1307out_parent:
1308	gfs2_holder_uninit(&r_gh);
1309out_inodes:
1310	gfs2_holder_uninit(&gh);
1311	gfs2_holder_uninit(&d_gh);
1312	return error;
1313}
1314
1315/**
1316 * gfs2_symlink - Create a symlink
1317 * @idmap: idmap of the mount the inode was found from
1318 * @dir: The directory to create the symlink in
1319 * @dentry: The dentry to put the symlink in
1320 * @symname: The thing which the link points to
1321 *
1322 * Returns: errno
1323 */
1324
1325static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1326			struct dentry *dentry, const char *symname)
1327{
1328	unsigned int size;
1329
1330	size = strlen(symname);
1331	if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1332		return -ENAMETOOLONG;
1333
1334	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1335}
1336
1337/**
1338 * gfs2_mkdir - Make a directory
1339 * @idmap: idmap of the mount the inode was found from
1340 * @dir: The parent directory of the new one
1341 * @dentry: The dentry of the new directory
1342 * @mode: The mode of the new directory
1343 *
1344 * Returns: the dentry, or ERR_PTR(errno)
1345 */
1346
1347static struct dentry *gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1348				 struct dentry *dentry, umode_t mode)
1349{
1350	unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1351
1352	return ERR_PTR(gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0));
1353}
1354
1355/**
1356 * gfs2_mknod - Make a special file
1357 * @idmap: idmap of the mount the inode was found from
1358 * @dir: The directory in which the special file will reside
1359 * @dentry: The dentry of the special file
1360 * @mode: The mode of the special file
1361 * @dev: The device specification of the special file
1362 *
1363 */
1364
1365static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1366		      struct dentry *dentry, umode_t mode, dev_t dev)
1367{
1368	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1369}
1370
1371/**
1372 * gfs2_atomic_open - Atomically open a file
1373 * @dir: The directory
1374 * @dentry: The proposed new entry
1375 * @file: The proposed new struct file
1376 * @flags: open flags
1377 * @mode: File mode
1378 *
1379 * Returns: error code or 0 for success
1380 */
1381
1382static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1383			    struct file *file, unsigned flags,
1384			    umode_t mode)
1385{
1386	bool excl = !!(flags & O_EXCL);
1387
1388	if (d_in_lookup(dentry)) {
1389		struct dentry *d = __gfs2_lookup(dir, dentry, file);
1390		if (file->f_mode & FMODE_OPENED) {
1391			if (IS_ERR(d))
1392				return PTR_ERR(d);
1393			dput(d);
1394			return excl && (flags & O_CREAT) ? -EEXIST : 0;
1395		}
1396		if (d || d_really_is_positive(dentry))
1397			return finish_no_open(file, d);
1398	}
1399	if (!(flags & O_CREAT))
1400		return -ENOENT;
1401
1402	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1403}
1404
1405/*
1406 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1407 * @this: move this
1408 * @to: to here
1409 *
1410 * Follow @to back to the root and make sure we don't encounter @this
1411 * Assumes we already hold the rename lock.
1412 *
1413 * Returns: errno
1414 */
1415
1416static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1417{
1418	struct inode *dir = &to->i_inode;
1419	struct super_block *sb = dir->i_sb;
1420	struct inode *tmp;
1421	int error = 0;
1422
1423	igrab(dir);
1424
1425	for (;;) {
1426		if (dir == &this->i_inode) {
1427			error = -EINVAL;
1428			break;
1429		}
1430		if (dir == d_inode(sb->s_root)) {
1431			error = 0;
1432			break;
1433		}
1434
1435		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1436		if (!tmp) {
1437			error = -ENOENT;
1438			break;
1439		}
1440		if (IS_ERR(tmp)) {
1441			error = PTR_ERR(tmp);
1442			break;
1443		}
1444
1445		iput(dir);
1446		dir = tmp;
1447	}
1448
1449	iput(dir);
1450
1451	return error;
1452}
1453
1454/**
1455 * update_moved_ino - Update an inode that's being moved
1456 * @ip: The inode being moved
1457 * @ndip: The parent directory of the new filename
1458 * @dir_rename: True of ip is a directory
1459 *
1460 * Returns: errno
1461 */
1462
1463static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1464			    int dir_rename)
1465{
1466	if (dir_rename)
1467		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1468
1469	inode_set_ctime_current(&ip->i_inode);
1470	mark_inode_dirty_sync(&ip->i_inode);
1471	return 0;
1472}
1473
1474
1475/**
1476 * gfs2_rename - Rename a file
1477 * @odir: Parent directory of old file name
1478 * @odentry: The old dentry of the file
1479 * @ndir: Parent directory of new file name
1480 * @ndentry: The new dentry of the file
1481 *
1482 * Returns: errno
1483 */
1484
1485static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1486		       struct inode *ndir, struct dentry *ndentry)
1487{
1488	struct gfs2_inode *odip = GFS2_I(odir);
1489	struct gfs2_inode *ndip = GFS2_I(ndir);
1490	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1491	struct gfs2_inode *nip = NULL;
1492	struct gfs2_sbd *sdp = GFS2_SB(odir);
1493	struct gfs2_holder ghs[4], r_gh, rd_gh;
1494	struct gfs2_rgrpd *nrgd;
1495	unsigned int num_gh;
1496	int dir_rename = 0;
1497	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1498	unsigned int retries = 0, x;
1499	int error;
1500
1501	gfs2_holder_mark_uninitialized(&r_gh);
1502	gfs2_holder_mark_uninitialized(&rd_gh);
1503	if (d_really_is_positive(ndentry)) {
1504		nip = GFS2_I(d_inode(ndentry));
1505		if (ip == nip)
1506			return 0;
1507	}
1508
1509	error = gfs2_rindex_update(sdp);
1510	if (error)
1511		return error;
1512
1513	error = gfs2_qa_get(ndip);
1514	if (error)
1515		return error;
1516
1517	if (odip != ndip) {
1518		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1519					   0, &r_gh);
1520		if (error)
1521			goto out;
1522
1523		if (S_ISDIR(ip->i_inode.i_mode)) {
1524			dir_rename = 1;
1525			/* don't move a directory into its subdir */
1526			error = gfs2_ok_to_move(ip, ndip);
1527			if (error)
1528				goto out_gunlock_r;
1529		}
1530	}
1531
1532	num_gh = 1;
1533	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1534	if (odip != ndip) {
1535		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1536				 ghs + num_gh);
1537		num_gh++;
1538	}
1539	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1540	num_gh++;
1541
1542	if (nip) {
1543		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1544				 ghs + num_gh);
1545		num_gh++;
1546	}
1547
1548again:
1549	for (x = 0; x < num_gh; x++) {
1550		error = gfs2_glock_nq(ghs + x);
1551		if (error)
1552			goto out_gunlock;
1553	}
1554	error = gfs2_glock_async_wait(num_gh, ghs, retries);
1555	if (error == -ESTALE) {
1556		retries++;
1557		goto again;
1558	}
1559	if (error)
1560		goto out_gunlock;
1561
1562	if (nip) {
1563		/* Grab the resource group glock for unlink flag twiddling.
1564		 * This is the case where the target dinode already exists
1565		 * so we unlink before doing the rename.
1566		 */
1567		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1568		if (!nrgd) {
1569			error = -ENOENT;
1570			goto out_gunlock;
1571		}
1572		error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1573					   LM_FLAG_NODE_SCOPE, &rd_gh);
1574		if (error)
1575			goto out_gunlock;
1576	}
1577
1578	error = -ENOENT;
1579	if (ip->i_inode.i_nlink == 0)
1580		goto out_gunlock;
1581
1582	/* Check out the old directory */
1583
1584	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1585	if (error)
1586		goto out_gunlock;
1587
1588	/* Check out the new directory */
1589
1590	if (nip) {
1591		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1592		if (error)
1593			goto out_gunlock;
1594
1595		if (nip->i_inode.i_nlink == 0) {
1596			error = -EAGAIN;
1597			goto out_gunlock;
1598		}
1599
1600		if (S_ISDIR(nip->i_inode.i_mode)) {
1601			if (nip->i_entries < 2) {
1602				gfs2_consist_inode(nip);
1603				error = -EIO;
1604				goto out_gunlock;
1605			}
1606			if (nip->i_entries > 2) {
1607				error = -ENOTEMPTY;
1608				goto out_gunlock;
1609			}
1610		}
1611	} else {
1612		error = gfs2_permission(&nop_mnt_idmap, ndir,
1613					MAY_WRITE | MAY_EXEC);
1614		if (error)
1615			goto out_gunlock;
1616
1617		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1618		switch (error) {
1619		case -ENOENT:
1620			error = 0;
1621			break;
1622		case 0:
1623			error = -EEXIST;
1624			goto out_gunlock;
1625		default:
1626			goto out_gunlock;
1627		}
1628
1629		if (odip != ndip) {
1630			if (!ndip->i_inode.i_nlink) {
1631				error = -ENOENT;
1632				goto out_gunlock;
1633			}
1634			if (ndip->i_entries == (u32)-1) {
1635				error = -EFBIG;
1636				goto out_gunlock;
1637			}
1638			if (S_ISDIR(ip->i_inode.i_mode) &&
1639			    ndip->i_inode.i_nlink == (u32)-1) {
1640				error = -EMLINK;
1641				goto out_gunlock;
1642			}
1643		}
1644	}
1645
1646	/* Check out the dir to be renamed */
1647
1648	if (dir_rename) {
1649		error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry),
1650					MAY_WRITE);
1651		if (error)
1652			goto out_gunlock;
1653	}
1654
1655	if (nip == NULL) {
1656		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1657		if (error)
1658			goto out_gunlock;
1659	}
1660
1661	if (da.nr_blocks) {
1662		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1663		error = gfs2_quota_lock_check(ndip, &ap);
1664		if (error)
1665			goto out_gunlock;
1666
1667		error = gfs2_inplace_reserve(ndip, &ap);
1668		if (error)
1669			goto out_gunlock_q;
1670
1671		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1672					 4 * RES_LEAF + 4, 0);
1673		if (error)
1674			goto out_ipreserv;
1675	} else {
1676		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1677					 5 * RES_LEAF + 4, 0);
1678		if (error)
1679			goto out_gunlock;
1680	}
1681
1682	/* Remove the target file, if it exists */
1683
1684	if (nip)
1685		error = gfs2_unlink_inode(ndip, ndentry);
1686
1687	error = update_moved_ino(ip, ndip, dir_rename);
1688	if (error)
1689		goto out_end_trans;
1690
1691	error = gfs2_dir_del(odip, odentry);
1692	if (error)
1693		goto out_end_trans;
1694
1695	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1696	if (error)
1697		goto out_end_trans;
1698
1699out_end_trans:
1700	gfs2_trans_end(sdp);
1701out_ipreserv:
1702	if (da.nr_blocks)
1703		gfs2_inplace_release(ndip);
1704out_gunlock_q:
1705	if (da.nr_blocks)
1706		gfs2_quota_unlock(ndip);
1707out_gunlock:
1708	gfs2_dir_no_add(&da);
1709	if (gfs2_holder_initialized(&rd_gh))
1710		gfs2_glock_dq_uninit(&rd_gh);
1711
1712	while (x--) {
1713		if (gfs2_holder_queued(ghs + x))
1714			gfs2_glock_dq(ghs + x);
1715		gfs2_holder_uninit(ghs + x);
1716	}
1717out_gunlock_r:
1718	if (gfs2_holder_initialized(&r_gh))
1719		gfs2_glock_dq_uninit(&r_gh);
1720out:
1721	gfs2_qa_put(ndip);
1722	return error;
1723}
1724
1725/**
1726 * gfs2_exchange - exchange two files
1727 * @odir: Parent directory of old file name
1728 * @odentry: The old dentry of the file
1729 * @ndir: Parent directory of new file name
1730 * @ndentry: The new dentry of the file
1731 * @flags: The rename flags
1732 *
1733 * Returns: errno
1734 */
1735
1736static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1737			 struct inode *ndir, struct dentry *ndentry,
1738			 unsigned int flags)
1739{
1740	struct gfs2_inode *odip = GFS2_I(odir);
1741	struct gfs2_inode *ndip = GFS2_I(ndir);
1742	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1743	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1744	struct gfs2_sbd *sdp = GFS2_SB(odir);
1745	struct gfs2_holder ghs[4], r_gh;
1746	unsigned int num_gh;
1747	unsigned int retries = 0, x;
1748	umode_t old_mode = oip->i_inode.i_mode;
1749	umode_t new_mode = nip->i_inode.i_mode;
1750	int error;
1751
1752	gfs2_holder_mark_uninitialized(&r_gh);
1753	error = gfs2_rindex_update(sdp);
1754	if (error)
1755		return error;
1756
1757	if (odip != ndip) {
1758		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1759					   0, &r_gh);
1760		if (error)
1761			goto out;
1762
1763		if (S_ISDIR(old_mode)) {
1764			/* don't move a directory into its subdir */
1765			error = gfs2_ok_to_move(oip, ndip);
1766			if (error)
1767				goto out_gunlock_r;
1768		}
1769
1770		if (S_ISDIR(new_mode)) {
1771			/* don't move a directory into its subdir */
1772			error = gfs2_ok_to_move(nip, odip);
1773			if (error)
1774				goto out_gunlock_r;
1775		}
1776	}
1777
1778	num_gh = 1;
1779	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1780	if (odip != ndip) {
1781		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1782				 ghs + num_gh);
1783		num_gh++;
1784	}
1785	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1786	num_gh++;
1787
1788	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1789	num_gh++;
1790
1791again:
1792	for (x = 0; x < num_gh; x++) {
1793		error = gfs2_glock_nq(ghs + x);
1794		if (error)
1795			goto out_gunlock;
1796	}
1797
1798	error = gfs2_glock_async_wait(num_gh, ghs, retries);
1799	if (error == -ESTALE) {
1800		retries++;
1801		goto again;
1802	}
1803	if (error)
1804		goto out_gunlock;
1805
1806	error = -ENOENT;
1807	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1808		goto out_gunlock;
1809
1810	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1811	if (error)
1812		goto out_gunlock;
1813	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1814	if (error)
1815		goto out_gunlock;
1816
1817	if (S_ISDIR(old_mode)) {
1818		error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode,
1819					MAY_WRITE);
1820		if (error)
1821			goto out_gunlock;
1822	}
1823	if (S_ISDIR(new_mode)) {
1824		error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode,
1825					MAY_WRITE);
1826		if (error)
1827			goto out_gunlock;
1828	}
1829	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1830	if (error)
1831		goto out_gunlock;
1832
1833	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1834	if (error)
1835		goto out_end_trans;
1836
1837	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1838	if (error)
1839		goto out_end_trans;
1840
1841	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1842			       IF2DT(old_mode));
1843	if (error)
1844		goto out_end_trans;
1845
1846	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1847			       IF2DT(new_mode));
1848	if (error)
1849		goto out_end_trans;
1850
1851	if (odip != ndip) {
1852		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1853			inc_nlink(&odip->i_inode);
1854			drop_nlink(&ndip->i_inode);
1855		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1856			inc_nlink(&ndip->i_inode);
1857			drop_nlink(&odip->i_inode);
1858		}
1859	}
1860	mark_inode_dirty(&ndip->i_inode);
1861	if (odip != ndip)
1862		mark_inode_dirty(&odip->i_inode);
1863
1864out_end_trans:
1865	gfs2_trans_end(sdp);
1866out_gunlock:
1867	while (x--) {
1868		if (gfs2_holder_queued(ghs + x))
1869			gfs2_glock_dq(ghs + x);
1870		gfs2_holder_uninit(ghs + x);
1871	}
1872out_gunlock_r:
1873	if (gfs2_holder_initialized(&r_gh))
1874		gfs2_glock_dq_uninit(&r_gh);
1875out:
1876	return error;
1877}
1878
1879static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1880			struct dentry *odentry, struct inode *ndir,
1881			struct dentry *ndentry, unsigned int flags)
1882{
1883	flags &= ~RENAME_NOREPLACE;
1884
1885	if (flags & ~RENAME_EXCHANGE)
1886		return -EINVAL;
1887
1888	if (flags & RENAME_EXCHANGE)
1889		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1890
1891	return gfs2_rename(odir, odentry, ndir, ndentry);
1892}
1893
1894/**
1895 * gfs2_get_link - Follow a symbolic link
1896 * @dentry: The dentry of the link
1897 * @inode: The inode of the link
1898 * @done: destructor for return value
1899 *
1900 * This can handle symlinks of any size.
1901 *
1902 * Returns: 0 on success or error code
1903 */
1904
1905static const char *gfs2_get_link(struct dentry *dentry,
1906				 struct inode *inode,
1907				 struct delayed_call *done)
1908{
1909	struct gfs2_inode *ip = GFS2_I(inode);
1910	struct gfs2_holder i_gh;
1911	struct buffer_head *dibh;
1912	unsigned int size;
1913	char *buf;
1914	int error;
1915
1916	if (!dentry)
1917		return ERR_PTR(-ECHILD);
1918
1919	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1920	error = gfs2_glock_nq(&i_gh);
1921	if (error) {
1922		gfs2_holder_uninit(&i_gh);
1923		return ERR_PTR(error);
1924	}
1925
1926	size = (unsigned int)i_size_read(&ip->i_inode);
1927	if (size == 0) {
1928		gfs2_consist_inode(ip);
1929		buf = ERR_PTR(-EIO);
1930		goto out;
1931	}
1932
1933	error = gfs2_meta_inode_buffer(ip, &dibh);
1934	if (error) {
1935		buf = ERR_PTR(error);
1936		goto out;
1937	}
1938
1939	buf = kzalloc(size + 1, GFP_NOFS);
1940	if (!buf)
1941		buf = ERR_PTR(-ENOMEM);
1942	else
1943		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1944	brelse(dibh);
1945out:
1946	gfs2_glock_dq_uninit(&i_gh);
1947	if (!IS_ERR(buf))
1948		set_delayed_call(done, kfree_link, buf);
1949	return buf;
1950}
1951
1952/**
1953 * gfs2_permission
1954 * @idmap: idmap of the mount the inode was found from
1955 * @inode: The inode
1956 * @mask: The mask to be tested
1957 *
1958 * This may be called from the VFS directly, or from within GFS2 with the
1959 * inode locked, so we look to see if the glock is already locked and only
1960 * lock the glock if its not already been done.
1961 *
1962 * Returns: errno
1963 */
1964
1965int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1966		    int mask)
1967{
1968	int may_not_block = mask & MAY_NOT_BLOCK;
1969	struct gfs2_inode *ip;
1970	struct gfs2_holder i_gh;
1971	struct gfs2_glock *gl;
1972	int error;
1973
1974	gfs2_holder_mark_uninitialized(&i_gh);
1975	ip = GFS2_I(inode);
1976	gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1977	if (unlikely(!gl)) {
1978		/* inode is getting torn down, must be RCU mode */
1979		WARN_ON_ONCE(!may_not_block);
1980		return -ECHILD;
1981        }
1982	if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1983		if (may_not_block)
1984			return -ECHILD;
1985		error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1986		if (error)
1987			return error;
1988	}
1989
1990	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1991		error = -EPERM;
1992	else
1993		error = generic_permission(&nop_mnt_idmap, inode, mask);
1994	if (gfs2_holder_initialized(&i_gh))
1995		gfs2_glock_dq_uninit(&i_gh);
1996
1997	return error;
1998}
1999
2000static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
2001{
2002	setattr_copy(&nop_mnt_idmap, inode, attr);
2003	mark_inode_dirty(inode);
2004	return 0;
2005}
2006
2007static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
2008{
2009	int error;
2010
2011	if (current->journal_info)
2012		return __gfs2_setattr_simple(inode, attr);
2013
2014	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
2015	if (error)
2016		return error;
2017
2018	error = __gfs2_setattr_simple(inode, attr);
2019	gfs2_trans_end(GFS2_SB(inode));
2020	return error;
2021}
2022
2023static int setattr_chown(struct inode *inode, struct iattr *attr)
2024{
2025	struct gfs2_inode *ip = GFS2_I(inode);
2026	struct gfs2_sbd *sdp = GFS2_SB(inode);
2027	kuid_t ouid, nuid;
2028	kgid_t ogid, ngid;
2029	int error;
2030	struct gfs2_alloc_parms ap = {};
2031
2032	ouid = inode->i_uid;
2033	ogid = inode->i_gid;
2034	nuid = attr->ia_uid;
2035	ngid = attr->ia_gid;
2036
2037	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
2038		ouid = nuid = NO_UID_QUOTA_CHANGE;
2039	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
2040		ogid = ngid = NO_GID_QUOTA_CHANGE;
2041	error = gfs2_qa_get(ip);
2042	if (error)
2043		return error;
2044
2045	error = gfs2_rindex_update(sdp);
2046	if (error)
2047		goto out;
2048
2049	error = gfs2_quota_lock(ip, nuid, ngid);
2050	if (error)
2051		goto out;
2052
2053	ap.target = gfs2_get_inode_blocks(&ip->i_inode);
2054
2055	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
2056	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
2057		error = gfs2_quota_check(ip, nuid, ngid, &ap);
2058		if (error)
2059			goto out_gunlock_q;
2060	}
2061
2062	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
2063	if (error)
2064		goto out_gunlock_q;
2065
2066	error = gfs2_setattr_simple(inode, attr);
2067	if (error)
2068		goto out_end_trans;
2069
2070	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
2071	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
2072		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
2073		gfs2_quota_change(ip, ap.target, nuid, ngid);
2074	}
2075
2076out_end_trans:
2077	gfs2_trans_end(sdp);
2078out_gunlock_q:
2079	gfs2_quota_unlock(ip);
2080out:
2081	gfs2_qa_put(ip);
2082	return error;
2083}
2084
2085/**
2086 * gfs2_setattr - Change attributes on an inode
2087 * @idmap: idmap of the mount the inode was found from
2088 * @dentry: The dentry which is changing
2089 * @attr: The structure describing the change
2090 *
2091 * The VFS layer wants to change one or more of an inodes attributes.  Write
2092 * that change out to disk.
2093 *
2094 * Returns: errno
2095 */
2096
2097static int gfs2_setattr(struct mnt_idmap *idmap,
2098			struct dentry *dentry, struct iattr *attr)
2099{
2100	struct inode *inode = d_inode(dentry);
2101	struct gfs2_inode *ip = GFS2_I(inode);
2102	struct gfs2_holder i_gh;
2103	int error;
2104
2105	error = gfs2_qa_get(ip);
2106	if (error)
2107		return error;
2108
2109	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
2110	if (error)
2111		goto out;
2112
2113	error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid);
2114	if (error)
2115		goto error;
2116
2117	error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2118	if (error)
2119		goto error;
2120
2121	if (attr->ia_valid & ATTR_SIZE)
2122		error = gfs2_setattr_size(inode, attr->ia_size);
2123	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2124		error = setattr_chown(inode, attr);
2125	else {
2126		error = gfs2_setattr_simple(inode, attr);
2127		if (!error && attr->ia_valid & ATTR_MODE)
2128			error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2129						inode->i_mode);
2130	}
2131
2132error:
2133	if (!error)
2134		mark_inode_dirty(inode);
2135	gfs2_glock_dq_uninit(&i_gh);
2136out:
2137	gfs2_qa_put(ip);
2138	return error;
2139}
2140
2141/**
2142 * gfs2_getattr - Read out an inode's attributes
2143 * @idmap: idmap of the mount the inode was found from
2144 * @path: Object to query
2145 * @stat: The inode's stats
2146 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2147 * @flags: AT_STATX_xxx setting
2148 *
2149 * This may be called from the VFS directly, or from within GFS2 with the
2150 * inode locked, so we look to see if the glock is already locked and only
2151 * lock the glock if its not already been done. Note that its the NFS
2152 * readdirplus operation which causes this to be called (from filldir)
2153 * with the glock already held.
2154 *
2155 * Returns: errno
2156 */
2157
2158static int gfs2_getattr(struct mnt_idmap *idmap,
2159			const struct path *path, struct kstat *stat,
2160			u32 request_mask, unsigned int flags)
2161{
2162	struct inode *inode = d_inode(path->dentry);
2163	struct gfs2_inode *ip = GFS2_I(inode);
2164	struct gfs2_holder gh;
2165	u32 gfsflags;
2166	int error;
2167
2168	gfs2_holder_mark_uninitialized(&gh);
2169	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2170		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2171		if (error)
2172			return error;
2173	}
2174
2175	gfsflags = ip->i_diskflags;
2176	if (gfsflags & GFS2_DIF_APPENDONLY)
2177		stat->attributes |= STATX_ATTR_APPEND;
2178	if (gfsflags & GFS2_DIF_IMMUTABLE)
2179		stat->attributes |= STATX_ATTR_IMMUTABLE;
2180
2181	stat->attributes_mask |= (STATX_ATTR_APPEND |
2182				  STATX_ATTR_COMPRESSED |
2183				  STATX_ATTR_ENCRYPTED |
2184				  STATX_ATTR_IMMUTABLE |
2185				  STATX_ATTR_NODUMP);
2186
2187	generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2188
2189	if (gfs2_holder_initialized(&gh))
2190		gfs2_glock_dq_uninit(&gh);
2191
2192	return 0;
2193}
2194
2195static bool fault_in_fiemap(struct fiemap_extent_info *fi)
2196{
2197	struct fiemap_extent __user *dest = fi->fi_extents_start;
2198	size_t size = sizeof(*dest) * fi->fi_extents_max;
2199
2200	return fault_in_safe_writeable((char __user *)dest, size) == 0;
2201}
2202
2203static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2204		       u64 start, u64 len)
2205{
2206	struct gfs2_inode *ip = GFS2_I(inode);
2207	struct gfs2_holder gh;
2208	int ret;
2209
2210	inode_lock_shared(inode);
2211
2212retry:
2213	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2214	if (ret)
2215		goto out;
2216
2217	pagefault_disable();
2218	ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2219	pagefault_enable();
2220
2221	gfs2_glock_dq_uninit(&gh);
2222
2223	if (ret == -EFAULT && fault_in_fiemap(fieinfo)) {
2224		fieinfo->fi_extents_mapped = 0;
2225		goto retry;
2226	}
2227
2228out:
2229	inode_unlock_shared(inode);
2230	return ret;
2231}
2232
2233loff_t gfs2_seek_data(struct file *file, loff_t offset)
2234{
2235	struct inode *inode = file->f_mapping->host;
2236	struct gfs2_inode *ip = GFS2_I(inode);
2237	struct gfs2_holder gh;
2238	loff_t ret;
2239
2240	inode_lock_shared(inode);
2241	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2242	if (!ret)
2243		ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2244	gfs2_glock_dq_uninit(&gh);
2245	inode_unlock_shared(inode);
2246
2247	if (ret < 0)
2248		return ret;
2249	return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2250}
2251
2252loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2253{
2254	struct inode *inode = file->f_mapping->host;
2255	struct gfs2_inode *ip = GFS2_I(inode);
2256	struct gfs2_holder gh;
2257	loff_t ret;
2258
2259	inode_lock_shared(inode);
2260	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2261	if (!ret)
2262		ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2263	gfs2_glock_dq_uninit(&gh);
2264	inode_unlock_shared(inode);
2265
2266	if (ret < 0)
2267		return ret;
2268	return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2269}
2270
2271static int gfs2_update_time(struct inode *inode, int flags)
2272{
2273	struct gfs2_inode *ip = GFS2_I(inode);
2274	struct gfs2_glock *gl = ip->i_gl;
2275	struct gfs2_holder *gh;
2276	int error;
2277
2278	gh = gfs2_glock_is_locked_by_me(gl);
2279	if (gh && gl->gl_state != LM_ST_EXCLUSIVE) {
2280		gfs2_glock_dq(gh);
2281		gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2282		error = gfs2_glock_nq(gh);
2283		if (error)
2284			return error;
2285	}
2286	generic_update_time(inode, flags);
2287	return 0;
2288}
2289
2290static const struct inode_operations gfs2_file_iops = {
2291	.permission = gfs2_permission,
2292	.setattr = gfs2_setattr,
2293	.getattr = gfs2_getattr,
2294	.listxattr = gfs2_listxattr,
2295	.fiemap = gfs2_fiemap,
2296	.get_inode_acl = gfs2_get_acl,
2297	.set_acl = gfs2_set_acl,
2298	.update_time = gfs2_update_time,
2299	.fileattr_get = gfs2_fileattr_get,
2300	.fileattr_set = gfs2_fileattr_set,
2301};
2302
2303static const struct inode_operations gfs2_dir_iops = {
2304	.create = gfs2_create,
2305	.lookup = gfs2_lookup,
2306	.link = gfs2_link,
2307	.unlink = gfs2_unlink,
2308	.symlink = gfs2_symlink,
2309	.mkdir = gfs2_mkdir,
2310	.rmdir = gfs2_unlink,
2311	.mknod = gfs2_mknod,
2312	.rename = gfs2_rename2,
2313	.permission = gfs2_permission,
2314	.setattr = gfs2_setattr,
2315	.getattr = gfs2_getattr,
2316	.listxattr = gfs2_listxattr,
2317	.fiemap = gfs2_fiemap,
2318	.get_inode_acl = gfs2_get_acl,
2319	.set_acl = gfs2_set_acl,
2320	.update_time = gfs2_update_time,
2321	.atomic_open = gfs2_atomic_open,
2322	.fileattr_get = gfs2_fileattr_get,
2323	.fileattr_set = gfs2_fileattr_set,
2324};
2325
2326static const struct inode_operations gfs2_symlink_iops = {
2327	.get_link = gfs2_get_link,
2328	.permission = gfs2_permission,
2329	.setattr = gfs2_setattr,
2330	.getattr = gfs2_getattr,
2331	.listxattr = gfs2_listxattr,
2332	.fiemap = gfs2_fiemap,
2333};
2334