inode.c 49.2 KB
Newer Older
D
David Teigland 已提交
1 2
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3
 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
D
David Teigland 已提交
4 5 6
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
7
 * of the GNU General Public License version 2.
D
David Teigland 已提交
8 9 10 11 12 13 14 15 16 17
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
18
#include <linux/gfs2_ondisk.h>
19
#include <linux/crc32.h>
20
#include <linux/fiemap.h>
21
#include <linux/security.h>
D
David Teigland 已提交
22 23 24
#include <asm/uaccess.h>

#include "gfs2.h"
25
#include "incore.h"
D
David Teigland 已提交
26 27 28
#include "acl.h"
#include "bmap.h"
#include "dir.h"
29
#include "xattr.h"
D
David Teigland 已提交
30 31 32 33 34 35
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
36
#include "util.h"
37
#include "super.h"
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151
#include "glops.h"

struct gfs2_skip_data {
	u64 no_addr;
	int skipped;
	int non_block;
};

static int iget_test(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_skip_data *data = opaque;

	if (ip->i_no_addr == data->no_addr) {
		if (data->non_block &&
		    inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
			data->skipped = 1;
			return 0;
		}
		return 1;
	}
	return 0;
}

static int iget_set(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_skip_data *data = opaque;

	if (data->skipped)
		return -ENOENT;
	inode->i_ino = (unsigned long)(data->no_addr);
	ip->i_no_addr = data->no_addr;
	return 0;
}

struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
{
	unsigned long hash = (unsigned long)no_addr;
	struct gfs2_skip_data data;

	data.no_addr = no_addr;
	data.skipped = 0;
	data.non_block = non_block;
	return ilookup5(sb, hash, iget_test, &data);
}

static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
			       int non_block)
{
	struct gfs2_skip_data data;
	unsigned long hash = (unsigned long)no_addr;

	data.no_addr = no_addr;
	data.skipped = 0;
	data.non_block = non_block;
	return iget5_locked(sb, hash, iget_test, iget_set, &data);
}

/**
 * gfs2_set_iop - Sets inode operations
 * @inode: The inode with correct i_mode filled in
 *
 * GFS2 lookup code fills in vfs inode contents based on info obtained
 * from directory entry inside gfs2_inode_lookup().
 */

static void gfs2_set_iop(struct inode *inode)
{
	struct gfs2_sbd *sdp = GFS2_SB(inode);
	umode_t mode = inode->i_mode;

	if (S_ISREG(mode)) {
		inode->i_op = &gfs2_file_iops;
		if (gfs2_localflocks(sdp))
			inode->i_fop = &gfs2_file_fops_nolock;
		else
			inode->i_fop = &gfs2_file_fops;
	} else if (S_ISDIR(mode)) {
		inode->i_op = &gfs2_dir_iops;
		if (gfs2_localflocks(sdp))
			inode->i_fop = &gfs2_dir_fops_nolock;
		else
			inode->i_fop = &gfs2_dir_fops;
	} else if (S_ISLNK(mode)) {
		inode->i_op = &gfs2_symlink_iops;
	} else {
		inode->i_op = &gfs2_file_iops;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
}

/**
 * gfs2_inode_lookup - Lookup an inode
 * @sb: The super block
 * @no_addr: The inode number
 * @type: The type of the inode
 * non_block: Can we block on inodes that are being freed?
 *
 * Returns: A VFS inode, or an error
 */

struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
				u64 no_addr, u64 no_formal_ino, int non_block)
{
	struct inode *inode;
	struct gfs2_inode *ip;
	struct gfs2_glock *io_gl = NULL;
	int error;

	inode = gfs2_iget(sb, no_addr, non_block);
	ip = GFS2_I(inode);

	if (!inode)
152
		return ERR_PTR(-ENOMEM);
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191

	if (inode->i_state & I_NEW) {
		struct gfs2_sbd *sdp = GFS2_SB(inode);
		ip->i_no_formal_ino = no_formal_ino;

		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
		if (unlikely(error))
			goto fail;
		ip->i_gl->gl_object = ip;

		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
		if (unlikely(error))
			goto fail_put;

		set_bit(GIF_INVALID, &ip->i_flags);
		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
		if (unlikely(error))
			goto fail_iopen;

		ip->i_iopen_gh.gh_gl->gl_object = ip;
		gfs2_glock_put(io_gl);
		io_gl = NULL;

		if (type == DT_UNKNOWN) {
			/* Inode glock must be locked already */
			error = gfs2_inode_refresh(GFS2_I(inode));
			if (error)
				goto fail_refresh;
		} else {
			inode->i_mode = DT2IF(type);
		}

		gfs2_set_iop(inode);
		unlock_new_inode(inode);
	}

	return inode;

fail_refresh:
B
Bob Peterson 已提交
192
	ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
	ip->i_iopen_gh.gh_gl->gl_object = NULL;
	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
fail_iopen:
	if (io_gl)
		gfs2_glock_put(io_gl);
fail_put:
	ip->i_gl->gl_object = NULL;
	gfs2_glock_put(ip->i_gl);
fail:
	iget_failed(inode);
	return ERR_PTR(error);
}

struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
				  u64 *no_formal_ino, unsigned int blktype)
{
	struct super_block *sb = sdp->sd_vfs;
	struct gfs2_holder i_gh;
	struct inode *inode = NULL;
	int error;

	/* Must not read in block until block type is verified */
	error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
				  LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
	if (error)
		return ERR_PTR(error);

	error = gfs2_check_blk_type(sdp, no_addr, blktype);
	if (error)
		goto fail;

	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
	if (IS_ERR(inode))
		goto fail;

	/* Two extra checks for NFS only */
	if (no_formal_ino) {
		error = -ESTALE;
		if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
			goto fail_iput;

		error = -EIO;
		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
			goto fail_iput;

		error = 0;
	}

fail:
	gfs2_glock_dq_uninit(&i_gh);
	return error ? ERR_PTR(error) : inode;
fail_iput:
	iput(inode);
	goto fail;
}


struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
	struct qstr qstr;
	struct inode *inode;
	gfs2_str2qstr(&qstr, name);
	inode = gfs2_lookupi(dip, &qstr, 1);
	/* gfs2_lookupi has inconsistent callers: vfs
	 * related routines expect NULL for no entry found,
	 * gfs2_lookup_simple callers expect ENOENT
	 * and do not check for NULL.
	 */
	if (inode == NULL)
		return ERR_PTR(-ENOENT);
	else
		return inode;
}


/**
 * gfs2_lookupi - Look up a filename in a directory and return its inode
 * @d_gh: An initialized holder for the directory glock
 * @name: The name of the inode to look for
 * @is_root: If 1, ignore the caller's permissions
 * @i_gh: An uninitialized holder for the new inode glock
 *
 * This can be called via the VFS filldir function when NFS is doing
 * a readdirplus and the inode which its intending to stat isn't
 * already in cache. In this case we must not take the directory glock
 * again, since the readdir call will have already taken that lock.
 *
 * Returns: errno
 */

struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
			   int is_root)
{
	struct super_block *sb = dir->i_sb;
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_holder d_gh;
	int error = 0;
	struct inode *inode = NULL;
	int unlock = 0;

	if (!name->len || name->len > GFS2_FNAMESIZE)
		return ERR_PTR(-ENAMETOOLONG);

	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298
	     dir == d_inode(sb->s_root))) {
299 300 301 302 303 304 305 306 307 308 309 310
		igrab(dir);
		return dir;
	}

	if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
		if (error)
			return ERR_PTR(error);
		unlock = 1;
	}

	if (!is_root) {
311
		error = gfs2_permission(dir, MAY_EXEC);
312 313 314 315
		if (error)
			goto out;
	}

316
	inode = gfs2_dir_search(dir, name, false);
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336
	if (IS_ERR(inode))
		error = PTR_ERR(inode);
out:
	if (unlock)
		gfs2_glock_dq_uninit(&d_gh);
	if (error == -ENOENT)
		return NULL;
	return inode ? inode : ERR_PTR(error);
}

/**
 * create_ok - OK to create a new on-disk inode here?
 * @dip:  Directory in which dinode is to be created
 * @name:  Name of new dinode
 * @mode:
 *
 * Returns: errno
 */

static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
A
Al Viro 已提交
337
		     umode_t mode)
338 339 340
{
	int error;

341
	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356
	if (error)
		return error;

	/*  Don't create entries in an unlinked directory  */
	if (!dip->i_inode.i_nlink)
		return -ENOENT;

	if (dip->i_entries == (u32)-1)
		return -EFBIG;
	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
		return -EMLINK;

	return 0;
}

357 358
static void munge_mode_uid_gid(const struct gfs2_inode *dip,
			       struct inode *inode)
359 360
{
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361 362
	    (dip->i_inode.i_mode & S_ISUID) &&
	    !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363 364
		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISUID;
365
		else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366 367
			inode->i_mode &= ~07111;
		inode->i_uid = dip->i_inode.i_uid;
368
	} else
369
		inode->i_uid = current_fsuid();
370 371

	if (dip->i_inode.i_mode & S_ISGID) {
372 373 374
		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISGID;
		inode->i_gid = dip->i_inode.i_gid;
375
	} else
376
		inode->i_gid = current_fsgid();
377 378
}

379
static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
380
{
381
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382
	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 384
	int error;

385
	error = gfs2_quota_lock_check(ip, &ap);
386 387 388
	if (error)
		goto out;

389
	error = gfs2_inplace_reserve(ip, &ap);
390 391 392
	if (error)
		goto out_quota;

393
	error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
394 395 396
	if (error)
		goto out_ipreserv;

397
	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
398 399 400
	ip->i_no_formal_ino = ip->i_generation;
	ip->i_inode.i_ino = ip->i_no_addr;
	ip->i_goal = ip->i_no_addr;
401 402 403 404

	gfs2_trans_end(sdp);

out_ipreserv:
405
	gfs2_inplace_release(ip);
406 407
out_quota:
	gfs2_quota_unlock(ip);
408 409 410 411
out:
	return error;
}

412 413
static void gfs2_init_dir(struct buffer_head *dibh,
			  const struct gfs2_inode *parent)
S
Steven Whitehouse 已提交
414 415 416 417 418 419 420 421 422 423 424 425 426 427 428
{
	struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
	struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);

	gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
	dent->de_inum = di->di_num; /* already GFS2 endian */
	dent->de_type = cpu_to_be16(DT_DIR);

	dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
	gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
	gfs2_inum_out(parent, dent);
	dent->de_type = cpu_to_be16(DT_DIR);
	
}

429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
/**
 * gfs2_init_xattr - Initialise an xattr block for a new inode
 * @ip: The inode in question
 *
 * This sets up an empty xattr block for a new inode, ready to
 * take any ACLs, LSM xattrs, etc.
 */

static void gfs2_init_xattr(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct buffer_head *bh;
	struct gfs2_ea_header *ea;

	bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
	gfs2_trans_add_meta(ip->i_gl, bh);
	gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
	gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));

	ea = GFS2_EA_BH2FIRST(bh);
	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
	ea->ea_type = GFS2_EATYPE_UNUSED;
	ea->ea_flags = GFS2_EAFLAG_LAST;

	brelse(bh);
}

456 457
/**
 * init_dinode - Fill in a new dinode structure
458
 * @dip: The directory this inode is being created in
459
 * @ip: The inode
460 461
 * @symname: The symlink destination (if a symlink)
 * @bhp: The buffer head (returned to caller)
462 463 464
 *
 */

465
static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466
			const char *symname)
467 468 469 470
{
	struct gfs2_dinode *di;
	struct buffer_head *dibh;

471
	dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472
	gfs2_trans_add_meta(ip->i_gl, dibh);
473
	di = (struct gfs2_dinode *)dibh->b_data;
474
	gfs2_dinode_out(ip, di);
475

476 477
	di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
	di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478 479 480 481 482
	di->__pad1 = 0;
	di->__pad2 = 0;
	di->__pad3 = 0;
	memset(&di->__pad4, 0, sizeof(di->__pad4));
	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483
	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484

485
	switch(ip->i_inode.i_mode & S_IFMT) {
486
	case S_IFDIR:
S
Steven Whitehouse 已提交
487
		gfs2_init_dir(dibh, dip);
488 489
		break;
	case S_IFLNK:
490
		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491
		break;
S
Steven Whitehouse 已提交
492 493
	}

494
	set_buffer_uptodate(dibh);
495
	brelse(dibh);
496 497
}

498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
/**
 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 * @dip: The directory we are linking into
 * @da: The dir add information
 * @nr_inodes: The number of inodes involved
 *
 * This calculate the number of blocks we need to reserve in a
 * transaction to link @nr_inodes into a directory. In most cases
 * @nr_inodes will be 2 (the directory plus the inode being linked in)
 * but in case of rename, 4 may be required.
 *
 * Returns: Number of blocks
 */

static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
				   const struct gfs2_diradd *da,
				   unsigned nr_inodes)
{
	return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
	       (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
}

520
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521
		       struct gfs2_inode *ip, struct gfs2_diradd *da)
522 523
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524
	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 526
	int error;

527
	if (da->nr_blocks) {
528
		error = gfs2_quota_lock_check(dip, &ap);
529 530 531
		if (error)
			goto fail_quota_locks;

532
		error = gfs2_inplace_reserve(dip, &ap);
533 534 535
		if (error)
			goto fail_quota_locks;

536
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 538 539 540 541 542 543 544
		if (error)
			goto fail_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
		if (error)
			goto fail_quota_locks;
	}

545
	error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 547 548

	gfs2_trans_end(sdp);
fail_ipreserv:
549
	gfs2_inplace_release(dip);
550 551 552 553 554
fail_quota_locks:
	gfs2_quota_unlock(dip);
	return error;
}

555
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
556
		    void *fs_info)
557
{
558 559 560 561 562 563 564 565 566
	const struct xattr *xattr;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
				       xattr->value_len, 0,
				       GFS2_EATYPE_SECURITY);
		if (err < 0)
			break;
567 568 569
	}
	return err;
}
D
David Teigland 已提交
570

571
/**
572 573 574
 * gfs2_create_inode - Create a new inode
 * @dir: The parent directory
 * @dentry: The new dentry
575
 * @file: If non-NULL, the file which is being opened
576 577 578 579
 * @mode: The permissions on the new inode
 * @dev: For device nodes, this is the device number
 * @symname: For symlinks, this is the link destination
 * @size: The initial size of the inode (ignored for directories)
580
 *
581
 * Returns: 0 on success, or error code
582 583
 */

584
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
585
			     struct file *file,
A
Al Viro 已提交
586
			     umode_t mode, dev_t dev, const char *symname,
587
			     unsigned int size, int excl, int *opened)
588
{
589
	const struct qstr *name = &dentry->d_name;
590
	struct posix_acl *default_acl, *acl;
591
	struct gfs2_holder ghs[2];
592
	struct inode *inode = NULL;
B
Bob Peterson 已提交
593
	struct gfs2_inode *dip = GFS2_I(dir), *ip;
594
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
595
	struct gfs2_glock *io_gl;
596
	int error, free_vfs_inode = 0;
S
Steven Whitehouse 已提交
597
	u32 aflags = 0;
598
	unsigned blocks = 1;
599
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
600 601

	if (!name->len || name->len > GFS2_FNAMESIZE)
602
		return -ENAMETOOLONG;
603

604 605 606 607
	error = gfs2_rs_alloc(dip);
	if (error)
		return error;

608 609 610 611
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

612
	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
613 614 615 616
	if (error)
		goto fail;

	error = create_ok(dip, name, mode);
617 618 619 620 621 622
	if (error)
		goto fail_gunlock;

	inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
	error = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
623 624 625 626 627
		if (S_ISDIR(inode->i_mode)) {
			iput(inode);
			inode = ERR_PTR(-EISDIR);
			goto fail_gunlock;
		}
628
		d_instantiate(dentry, inode);
629
		error = 0;
630
		if (file) {
631
			if (S_ISREG(inode->i_mode))
M
Miklos Szeredi 已提交
632
				error = finish_open(file, dentry, gfs2_open_common, opened);
633 634
			else
				error = finish_no_open(file, NULL);
635
		}
S
Steven Whitehouse 已提交
636
		gfs2_glock_dq_uninit(ghs);
637
		return error;
638
	} else if (error != -ENOENT) {
639
		goto fail_gunlock;
640
	}
641

642
	error = gfs2_diradd_alloc_required(dir, name, &da);
643 644 645
	if (error < 0)
		goto fail_gunlock;

646
	inode = new_inode(sdp->sd_vfs);
647 648 649 650
	error = -ENOMEM;
	if (!inode)
		goto fail_gunlock;

651 652 653 654
	error = posix_acl_create(dir, &mode, &default_acl, &acl);
	if (error)
		goto fail_free_vfs_inode;

655 656
	ip = GFS2_I(inode);
	error = gfs2_rs_alloc(ip);
657
	if (error)
658
		goto fail_free_acls;
659 660

	inode->i_mode = mode;
661
	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
662 663
	inode->i_rdev = dev;
	inode->i_size = size;
664
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
665
	gfs2_set_inode_blocks(inode, 1);
666
	munge_mode_uid_gid(dip, inode);
667
	check_and_update_goal(dip);
668
	ip->i_goal = dip->i_goal;
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
	ip->i_diskflags = 0;
	ip->i_eattr = 0;
	ip->i_height = 0;
	ip->i_depth = 0;
	ip->i_entries = 0;

	switch(mode & S_IFMT) {
	case S_IFREG:
		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
		    gfs2_tune_get(sdp, gt_new_files_jdata))
			ip->i_diskflags |= GFS2_DIF_JDATA;
		gfs2_set_aops(inode);
		break;
	case S_IFDIR:
		ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
		ip->i_diskflags |= GFS2_DIF_JDATA;
		ip->i_entries = 2;
		break;
	}
688 689 690 691 692

	/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
	if (dip->i_diskflags & GFS2_DIF_SYSTEM)
		ip->i_diskflags |= GFS2_DIF_SYSTEM;

693
	gfs2_set_inode_flags(inode);
694

695
	if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
S
Steven Whitehouse 已提交
696 697 698
	    (dip->i_diskflags & GFS2_DIF_TOPDIR))
		aflags |= GFS2_AF_ORLOV;

699 700 701 702
	if (default_acl || acl)
		blocks++;

	error = alloc_dinode(ip, aflags, &blocks);
703
	if (error)
704
		goto fail_free_inode;
705

706 707
	gfs2_set_inode_blocks(inode, blocks);

708
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
709
	if (error)
710
		goto fail_free_inode;
711

712
	ip->i_gl->gl_object = ip;
713 714 715 716
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
	if (error)
		goto fail_free_inode;

717
	error = gfs2_trans_begin(sdp, blocks, 0);
718
	if (error)
719 720
		goto fail_gunlock2;

721 722 723 724
	if (blocks > 1) {
		ip->i_eattr = ip->i_no_addr + 1;
		gfs2_init_xattr(ip);
	}
725
	init_dinode(dip, ip, symname);
726 727
	gfs2_trans_end(sdp);

728
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
729 730 731
	if (error)
		goto fail_gunlock2;

732
	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
733 734
	if (error)
		goto fail_gunlock2;
735

736 737 738 739 740
	ip->i_iopen_gh.gh_gl->gl_object = ip;
	gfs2_glock_put(io_gl);
	gfs2_set_iop(inode);
	insert_inode_hash(inode);

741 742 743 744 745 746 747 748 749 750
	if (default_acl) {
		error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
		posix_acl_release(default_acl);
	}
	if (acl) {
		if (!error)
			error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
		posix_acl_release(acl);
	}

751
	if (error)
752
		goto fail_gunlock3;
753

754 755
	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
					     &gfs2_initxattrs, NULL);
756
	if (error)
757
		goto fail_gunlock3;
758

759
	error = link_dinode(dip, name, ip, &da);
760
	if (error)
761
		goto fail_gunlock3;
762

763
	mark_inode_dirty(inode);
764
	d_instantiate(dentry, inode);
M
Miklos Szeredi 已提交
765 766
	if (file) {
		*opened |= FILE_CREATED;
767
		error = finish_open(file, dentry, gfs2_open_common, opened);
M
Miklos Szeredi 已提交
768
	}
769 770
	gfs2_glock_dq_uninit(ghs);
	gfs2_glock_dq_uninit(ghs + 1);
771
	return error;
772

773 774 775 776 777 778
fail_gunlock3:
	gfs2_glock_dq_uninit(ghs + 1);
	if (ip->i_gl)
		gfs2_glock_put(ip->i_gl);
	goto fail_gunlock;

779 780
fail_gunlock2:
	gfs2_glock_dq_uninit(ghs + 1);
781 782 783
fail_free_inode:
	if (ip->i_gl)
		gfs2_glock_put(ip->i_gl);
784
	gfs2_rs_delete(ip, NULL);
785 786 787 788 789 790
fail_free_acls:
	if (default_acl)
		posix_acl_release(default_acl);
	if (acl)
		posix_acl_release(acl);
fail_free_vfs_inode:
791
	free_vfs_inode = 1;
792
fail_gunlock:
793
	gfs2_dir_no_add(&da);
794
	gfs2_glock_dq_uninit(ghs);
795
	if (inode && !IS_ERR(inode)) {
796
		clear_nlink(inode);
797 798 799 800
		if (!free_vfs_inode)
			mark_inode_dirty(inode);
		set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
			&GFS2_I(inode)->i_flags);
801 802
		iput(inode);
	}
803
fail:
804
	return error;
805
}
806

D
David Teigland 已提交
807 808 809 810 811 812 813 814 815 816
/**
 * gfs2_create - Create a file
 * @dir: The directory in which to create the file
 * @dentry: The dentry of the new file
 * @mode: The mode of the new file
 *
 * Returns: errno
 */

static int gfs2_create(struct inode *dir, struct dentry *dentry,
A
Al Viro 已提交
817
		       umode_t mode, bool excl)
D
David Teigland 已提交
818
{
819
	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
D
David Teigland 已提交
820 821 822
}

/**
823
 * __gfs2_lookup - Look up a filename in a directory and return its inode
D
David Teigland 已提交
824 825
 * @dir: The directory inode
 * @dentry: The dentry of the new inode
826 827
 * @file: File to be opened
 * @opened: atomic_open flags
D
David Teigland 已提交
828 829 830 831 832
 *
 *
 * Returns: errno
 */

833 834
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
				    struct file *file, int *opened)
D
David Teigland 已提交
835
{
836 837 838 839 840 841 842
	struct inode *inode;
	struct dentry *d;
	struct gfs2_holder gh;
	struct gfs2_glock *gl;
	int error;

	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
843 844
	if (inode == NULL) {
		d_add(dentry, NULL);
845
		return NULL;
846
	}
847 848 849 850 851 852 853 854
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	gl = GFS2_I(inode)->i_gl;
	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
	if (error) {
		iput(inode);
		return ERR_PTR(error);
855
	}
856 857

	d = d_splice_alias(inode, dentry);
858 859 860 861
	if (IS_ERR(d)) {
		gfs2_glock_dq_uninit(&gh);
		return d;
	}
862 863 864 865
	if (file && S_ISREG(inode->i_mode))
		error = finish_open(file, dentry, gfs2_open_common, opened);

	gfs2_glock_dq_uninit(&gh);
M
Miklos Szeredi 已提交
866 867
	if (error) {
		dput(d);
868
		return ERR_PTR(error);
M
Miklos Szeredi 已提交
869
	}
870 871 872 873 874 875 876
	return d;
}

static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
				  unsigned flags)
{
	return __gfs2_lookup(dir, dentry, NULL, NULL);
D
David Teigland 已提交
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
}

/**
 * gfs2_link - Link to a file
 * @old_dentry: The inode to link
 * @dir: Add link to this directory
 * @dentry: The name of the link
 *
 * Link the inode in "old_dentry" into the directory "dir" with the
 * name in "dentry".
 *
 * Returns: errno
 */

static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
		     struct dentry *dentry)
{
894 895
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
896
	struct inode *inode = d_inode(old_dentry);
897
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
898
	struct gfs2_holder ghs[2];
899
	struct buffer_head *dibh;
900
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
D
David Teigland 已提交
901 902
	int error;

903
	if (S_ISDIR(inode->i_mode))
D
David Teigland 已提交
904 905
		return -EPERM;

906 907 908 909
	error = gfs2_rs_alloc(dip);
	if (error)
		return error;

D
David Teigland 已提交
910 911 912
	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);

913 914 915 916 917
	error = gfs2_glock_nq(ghs); /* parent */
	if (error)
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
D
David Teigland 已提交
918
	if (error)
919
		goto out_child;
D
David Teigland 已提交
920

921 922 923 924
	error = -ENOENT;
	if (inode->i_nlink == 0)
		goto out_gunlock;

925
	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
926 927 928
	if (error)
		goto out_gunlock;

929
	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
D
David Teigland 已提交
930 931 932 933 934 935 936 937 938 939
	switch (error) {
	case -ENOENT:
		break;
	case 0:
		error = -EEXIST;
	default:
		goto out_gunlock;
	}

	error = -EINVAL;
940
	if (!dip->i_inode.i_nlink)
D
David Teigland 已提交
941 942
		goto out_gunlock;
	error = -EFBIG;
943
	if (dip->i_entries == (u32)-1)
D
David Teigland 已提交
944 945 946 947 948
		goto out_gunlock;
	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out_gunlock;
	error = -EINVAL;
949
	if (!ip->i_inode.i_nlink)
D
David Teigland 已提交
950 951
		goto out_gunlock;
	error = -EMLINK;
952
	if (ip->i_inode.i_nlink == (u32)-1)
D
David Teigland 已提交
953 954
		goto out_gunlock;

955
	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
956
	if (error < 0)
D
David Teigland 已提交
957 958
		goto out_gunlock;

959 960
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
961
		error = gfs2_quota_lock_check(dip, &ap);
D
David Teigland 已提交
962
		if (error)
963
			goto out_gunlock;
D
David Teigland 已提交
964

965
		error = gfs2_inplace_reserve(dip, &ap);
D
David Teigland 已提交
966 967 968
		if (error)
			goto out_gunlock_q;

969
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
D
David Teigland 已提交
970 971 972 973 974 975 976 977
		if (error)
			goto out_ipres;
	} else {
		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
		if (error)
			goto out_ipres;
	}

978
	error = gfs2_meta_inode_buffer(ip, &dibh);
D
David Teigland 已提交
979 980 981
	if (error)
		goto out_end_trans;

982
	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
983 984 985
	if (error)
		goto out_brelse;

986
	gfs2_trans_add_meta(ip->i_gl, dibh);
987 988
	inc_nlink(&ip->i_inode);
	ip->i_inode.i_ctime = CURRENT_TIME;
S
Steven Whitehouse 已提交
989 990 991
	ihold(inode);
	d_instantiate(dentry, inode);
	mark_inode_dirty(inode);
D
David Teigland 已提交
992

993 994
out_brelse:
	brelse(dibh);
995
out_end_trans:
D
David Teigland 已提交
996
	gfs2_trans_end(sdp);
997
out_ipres:
998
	if (da.nr_blocks)
D
David Teigland 已提交
999
		gfs2_inplace_release(dip);
1000
out_gunlock_q:
1001
	if (da.nr_blocks)
D
David Teigland 已提交
1002
		gfs2_quota_unlock(dip);
1003
out_gunlock:
1004
	gfs2_dir_no_add(&da);
1005 1006 1007 1008
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
D
David Teigland 已提交
1009 1010 1011 1012 1013
	gfs2_holder_uninit(ghs);
	gfs2_holder_uninit(ghs + 1);
	return error;
}

1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
/*
 * gfs2_unlink_ok - check to see that a inode is still in a directory
 * @dip: the directory
 * @name: the name of the file
 * @ip: the inode
 *
 * Assumes that the lock on (at least) @dip is held.
 *
 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
 */

static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
			  const struct gfs2_inode *ip)
{
	int error;

	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
		return -EPERM;

	if ((dip->i_inode.i_mode & S_ISVTX) &&
1034 1035
	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1036 1037 1038 1039 1040
		return -EPERM;

	if (IS_APPEND(&dip->i_inode))
		return -EPERM;

1041
	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1042 1043 1044
	if (error)
		return error;

1045
	return gfs2_dir_check(&dip->i_inode, name, ip);
1046 1047
}

D
David Teigland 已提交
1048
/**
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
 * @dip: The parent directory
 * @name: The name of the entry in the parent directory
 * @inode: The inode to be removed
 *
 * Called with all the locks and in a transaction. This will only be
 * called for a directory after it has been checked to ensure it is empty.
 *
 * Returns: 0 on success, or an error
 */

static int gfs2_unlink_inode(struct gfs2_inode *dip,
1061
			     const struct dentry *dentry)
1062
{
1063
	struct inode *inode = d_inode(dentry);
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
	struct gfs2_inode *ip = GFS2_I(inode);
	int error;

	error = gfs2_dir_del(dip, dentry);
	if (error)
		return error;

	ip->i_entries = 0;
	inode->i_ctime = CURRENT_TIME;
	if (S_ISDIR(inode->i_mode))
		clear_nlink(inode);
	else
		drop_nlink(inode);
	mark_inode_dirty(inode);
	if (inode->i_nlink == 0)
		gfs2_unlink_di(inode);
	return 0;
}


/**
 * gfs2_unlink - Unlink an inode (this does rmdir as well)
 * @dir: The inode of the directory containing the inode to unlink
D
David Teigland 已提交
1087 1088
 * @dentry: The file itself
 *
1089 1090
 * This routine uses the type of the inode as a flag to figure out
 * whether this is an unlink or an rmdir.
D
David Teigland 已提交
1091 1092 1093 1094 1095 1096
 *
 * Returns: errno
 */

static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
{
1097 1098
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1099
	struct inode *inode = d_inode(dentry);
1100
	struct gfs2_inode *ip = GFS2_I(inode);
R
Russell Cattelan 已提交
1101 1102
	struct gfs2_holder ghs[3];
	struct gfs2_rgrpd *rgd;
1103 1104 1105 1106 1107 1108 1109
	int error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	error = -EROFS;
D
David Teigland 已提交
1110 1111

	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
R
Russell Cattelan 已提交
1112
	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
D
David Teigland 已提交
1113

S
Steven Whitehouse 已提交
1114
	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1115
	if (!rgd)
1116
		goto out_inodes;
1117

R
Russell Cattelan 已提交
1118 1119 1120
	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);


1121
	error = gfs2_glock_nq(ghs); /* parent */
D
David Teigland 已提交
1122
	if (error)
1123 1124 1125 1126 1127 1128
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
	if (error)
		goto out_child;

1129
	error = -ENOENT;
1130
	if (inode->i_nlink == 0)
1131 1132
		goto out_rgrp;

1133 1134 1135 1136 1137 1138
	if (S_ISDIR(inode->i_mode)) {
		error = -ENOTEMPTY;
		if (ip->i_entries > 2 || inode->i_nlink > 2)
			goto out_rgrp;
	}

1139 1140 1141
	error = gfs2_glock_nq(ghs + 2); /* rgrp */
	if (error)
		goto out_rgrp;
D
David Teigland 已提交
1142 1143 1144

	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
	if (error)
1145
		goto out_gunlock;
D
David Teigland 已提交
1146

1147 1148 1149
	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1150

1151
	error = gfs2_unlink_inode(dip, dentry);
D
David Teigland 已提交
1152

1153 1154
out_end_trans:
	gfs2_trans_end(sdp);
1155
out_gunlock:
1156 1157 1158 1159 1160 1161
	gfs2_glock_dq(ghs + 2);
out_rgrp:
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
1162 1163 1164
	gfs2_holder_uninit(ghs + 2);
out_inodes:
	gfs2_holder_uninit(ghs + 1);
1165
	gfs2_holder_uninit(ghs);
D
David Teigland 已提交
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	return error;
}

/**
 * gfs2_symlink - Create a symlink
 * @dir: The directory to create the symlink in
 * @dentry: The dentry to put the symlink in
 * @symname: The thing which the link points to
 *
 * Returns: errno
 */

static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
			const char *symname)
{
1181
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1182
	unsigned int size;
D
David Teigland 已提交
1183 1184 1185 1186 1187

	size = strlen(symname);
	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
		return -ENAMETOOLONG;

1188
	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
D
David Teigland 已提交
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
}

/**
 * gfs2_mkdir - Make a directory
 * @dir: The parent directory of the new one
 * @dentry: The dentry of the new directory
 * @mode: The mode of the new directory
 *
 * Returns: errno
 */

1200
static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
D
David Teigland 已提交
1201
{
1202 1203
	struct gfs2_sbd *sdp = GFS2_SB(dir);
	unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1204
	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
D
David Teigland 已提交
1205 1206 1207 1208 1209 1210 1211
}

/**
 * gfs2_mknod - Make a special file
 * @dir: The directory in which the special file will reside
 * @dentry: The dentry of the special file
 * @mode: The mode of the special file
1212
 * @dev: The device specification of the special file
D
David Teigland 已提交
1213 1214 1215
 *
 */

A
Al Viro 已提交
1216
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
D
David Teigland 已提交
1217 1218
		      dev_t dev)
{
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
}

/**
 * gfs2_atomic_open - Atomically open a file
 * @dir: The directory
 * @dentry: The proposed new entry
 * @file: The proposed new struct file
 * @flags: open flags
 * @mode: File mode
 * @opened: Flag to say whether the file has been opened or not
 *
 * Returns: error code or 0 for success
 */

static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1235 1236
			    struct file *file, unsigned flags,
			    umode_t mode, int *opened)
1237 1238 1239 1240
{
	struct dentry *d;
	bool excl = !!(flags & O_EXCL);

1241 1242 1243
	if (!d_unhashed(dentry))
		goto skip_lookup;

1244 1245 1246
	d = __gfs2_lookup(dir, dentry, file, opened);
	if (IS_ERR(d))
		return PTR_ERR(d);
M
Miklos Szeredi 已提交
1247 1248
	if (d != NULL)
		dentry = d;
1249
	if (d_really_is_positive(dentry)) {
1250 1251
		if (!(*opened & FILE_OPENED))
			return finish_no_open(file, d);
M
Miklos Szeredi 已提交
1252
		dput(d);
1253 1254 1255
		return 0;
	}

M
Miklos Szeredi 已提交
1256
	BUG_ON(d != NULL);
1257 1258

skip_lookup:
1259 1260 1261 1262
	if (!(flags & O_CREAT))
		return -ENOENT;

	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
D
David Teigland 已提交
1263 1264
}

1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
/*
 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
 * @this: move this
 * @to: to here
 *
 * Follow @to back to the root and make sure we don't encounter @this
 * Assumes we already hold the rename lock.
 *
 * Returns: errno
 */

static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
{
	struct inode *dir = &to->i_inode;
	struct super_block *sb = dir->i_sb;
	struct inode *tmp;
	int error = 0;

	igrab(dir);

	for (;;) {
		if (dir == &this->i_inode) {
			error = -EINVAL;
			break;
		}
1290
		if (dir == d_inode(sb->s_root)) {
1291 1292 1293 1294
			error = 0;
			break;
		}

1295
		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1296 1297 1298 1299
		if (!tmp) {
			error = -ENOENT;
			break;
		}
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
		if (IS_ERR(tmp)) {
			error = PTR_ERR(tmp);
			break;
		}

		iput(dir);
		dir = tmp;
	}

	iput(dir);

	return error;
}

1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
/**
 * update_moved_ino - Update an inode that's being moved
 * @ip: The inode being moved
 * @ndip: The parent directory of the new filename
 * @dir_rename: True of ip is a directory
 *
 * Returns: errno
 */

static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
			    int dir_rename)
{
	int error;
	struct buffer_head *dibh;

	if (dir_rename)
		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;
	ip->i_inode.i_ctime = CURRENT_TIME;
	gfs2_trans_add_meta(ip->i_gl, dibh);
	gfs2_dinode_out(ip, dibh->b_data);
	brelse(dibh);
	return 0;
}


D
David Teigland 已提交
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
/**
 * gfs2_rename - Rename a file
 * @odir: Parent directory of old file name
 * @odentry: The old dentry of the file
 * @ndir: Parent directory of new file name
 * @ndentry: The new dentry of the file
 *
 * Returns: errno
 */

static int gfs2_rename(struct inode *odir, struct dentry *odentry,
		       struct inode *ndir, struct dentry *ndentry)
{
1356 1357
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
1358
	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
D
David Teigland 已提交
1359
	struct gfs2_inode *nip = NULL;
1360
	struct gfs2_sbd *sdp = GFS2_SB(odir);
1361
	struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
R
Russell Cattelan 已提交
1362
	struct gfs2_rgrpd *nrgd;
D
David Teigland 已提交
1363 1364
	unsigned int num_gh;
	int dir_rename = 0;
1365
	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
D
David Teigland 已提交
1366 1367 1368
	unsigned int x;
	int error;

1369 1370
	if (d_really_is_positive(ndentry)) {
		nip = GFS2_I(d_inode(ndentry));
D
David Teigland 已提交
1371 1372 1373 1374
		if (ip == nip)
			return 0;
	}

1375 1376 1377 1378
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

1379 1380 1381 1382
	error = gfs2_rs_alloc(ndip);
	if (error)
		return error;

1383 1384 1385
	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
D
David Teigland 已提交
1386 1387 1388
		if (error)
			goto out;

1389 1390
		if (S_ISDIR(ip->i_inode.i_mode)) {
			dir_rename = 1;
1391
			/* don't move a directory into its subdir */
1392 1393 1394 1395
			error = gfs2_ok_to_move(ip, ndip);
			if (error)
				goto out_gunlock_r;
		}
D
David Teigland 已提交
1396 1397
	}

1398
	num_gh = 1;
D
David Teigland 已提交
1399
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1400 1401 1402 1403 1404 1405
	if (odip != ndip) {
		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
	}
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;
D
David Teigland 已提交
1406

1407 1408 1409
	if (nip) {
		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
R
Russell Cattelan 已提交
1410 1411 1412 1413
		/* grab the resource lock for unlink flag twiddling 
		 * this is the case of the target file already existing
		 * so we unlink before doing the rename
		 */
S
Steven Whitehouse 已提交
1414
		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
R
Russell Cattelan 已提交
1415 1416
		if (nrgd)
			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1417
	}
D
David Teigland 已提交
1418

1419 1420 1421 1422 1423
	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1424

1425 1426 1427 1428
	error = -ENOENT;
	if (ip->i_inode.i_nlink == 0)
		goto out_gunlock;

D
David Teigland 已提交
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
	/* Check out the old directory */

	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
	if (error)
		goto out_gunlock;

	/* Check out the new directory */

	if (nip) {
		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
		if (error)
			goto out_gunlock;

1442 1443 1444 1445 1446
		if (nip->i_inode.i_nlink == 0) {
			error = -EAGAIN;
			goto out_gunlock;
		}

1447
		if (S_ISDIR(nip->i_inode.i_mode)) {
1448
			if (nip->i_entries < 2) {
1449
				gfs2_consist_inode(nip);
D
David Teigland 已提交
1450 1451 1452
				error = -EIO;
				goto out_gunlock;
			}
1453
			if (nip->i_entries > 2) {
D
David Teigland 已提交
1454 1455 1456 1457 1458
				error = -ENOTEMPTY;
				goto out_gunlock;
			}
		}
	} else {
1459
		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
1460 1461 1462
		if (error)
			goto out_gunlock;

1463
		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
D
David Teigland 已提交
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
		switch (error) {
		case -ENOENT:
			error = 0;
			break;
		case 0:
			error = -EEXIST;
		default:
			goto out_gunlock;
		};

		if (odip != ndip) {
1475
			if (!ndip->i_inode.i_nlink) {
1476
				error = -ENOENT;
D
David Teigland 已提交
1477 1478
				goto out_gunlock;
			}
1479
			if (ndip->i_entries == (u32)-1) {
D
David Teigland 已提交
1480 1481 1482
				error = -EFBIG;
				goto out_gunlock;
			}
1483
			if (S_ISDIR(ip->i_inode.i_mode) &&
1484
			    ndip->i_inode.i_nlink == (u32)-1) {
D
David Teigland 已提交
1485 1486 1487 1488 1489 1490 1491 1492 1493
				error = -EMLINK;
				goto out_gunlock;
			}
		}
	}

	/* Check out the dir to be renamed */

	if (dir_rename) {
1494
		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
D
David Teigland 已提交
1495 1496 1497 1498
		if (error)
			goto out_gunlock;
	}

1499 1500 1501 1502 1503
	if (nip == NULL) {
		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1504

1505 1506
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1507
		error = gfs2_quota_lock_check(ndip, &ap);
D
David Teigland 已提交
1508
		if (error)
1509
			goto out_gunlock;
D
David Teigland 已提交
1510

1511
		error = gfs2_inplace_reserve(ndip, &ap);
D
David Teigland 已提交
1512 1513 1514
		if (error)
			goto out_gunlock_q;

1515 1516
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
					 4 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1517 1518 1519 1520
		if (error)
			goto out_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
S
S. Wendy Cheng 已提交
1521
					 5 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1522 1523 1524 1525 1526 1527
		if (error)
			goto out_gunlock;
	}

	/* Remove the target file, if it exists */

1528 1529
	if (nip)
		error = gfs2_unlink_inode(ndip, ndentry);
D
David Teigland 已提交
1530

1531 1532 1533
	error = update_moved_ino(ip, ndip, dir_rename);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1534

1535
	error = gfs2_dir_del(odip, odentry);
D
David Teigland 已提交
1536 1537 1538
	if (error)
		goto out_end_trans;

1539
	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
D
David Teigland 已提交
1540 1541 1542
	if (error)
		goto out_end_trans;

1543
out_end_trans:
D
David Teigland 已提交
1544
	gfs2_trans_end(sdp);
1545
out_ipreserv:
1546
	if (da.nr_blocks)
D
David Teigland 已提交
1547
		gfs2_inplace_release(ndip);
1548
out_gunlock_q:
1549
	if (da.nr_blocks)
D
David Teigland 已提交
1550
		gfs2_quota_unlock(ndip);
1551
out_gunlock:
1552
	gfs2_dir_no_add(&da);
1553 1554
	while (x--) {
		gfs2_glock_dq(ghs + x);
D
David Teigland 已提交
1555
		gfs2_holder_uninit(ghs + x);
1556
	}
1557
out_gunlock_r:
1558
	if (r_gh.gh_gl)
D
David Teigland 已提交
1559
		gfs2_glock_dq_uninit(&r_gh);
1560
out:
D
David Teigland 已提交
1561 1562 1563
	return error;
}

1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
/**
 * gfs2_exchange - exchange two files
 * @odir: Parent directory of old file name
 * @odentry: The old dentry of the file
 * @ndir: Parent directory of new file name
 * @ndentry: The new dentry of the file
 * @flags: The rename flags
 *
 * Returns: errno
 */

static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
			 struct inode *ndir, struct dentry *ndentry,
			 unsigned int flags)
{
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
	struct gfs2_sbd *sdp = GFS2_SB(odir);
	struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
	unsigned int num_gh;
	unsigned int x;
	umode_t old_mode = oip->i_inode.i_mode;
	umode_t new_mode = nip->i_inode.i_mode;
	int error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
		if (error)
			goto out;

		if (S_ISDIR(old_mode)) {
			/* don't move a directory into its subdir */
			error = gfs2_ok_to_move(oip, ndip);
			if (error)
				goto out_gunlock_r;
		}

		if (S_ISDIR(new_mode)) {
			/* don't move a directory into its subdir */
			error = gfs2_ok_to_move(nip, odip);
			if (error)
				goto out_gunlock_r;
		}
	}

	num_gh = 1;
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	if (odip != ndip) {
		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
	}
	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;

	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;

	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}

	error = -ENOENT;
	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
		goto out_gunlock;

	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
	if (error)
		goto out_gunlock;
	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
	if (error)
		goto out_gunlock;

	if (S_ISDIR(old_mode)) {
		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
		if (error)
			goto out_gunlock;
	}
	if (S_ISDIR(new_mode)) {
		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
		if (error)
			goto out_gunlock;
	}
	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
	if (error)
		goto out_gunlock;

	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
	if (error)
		goto out_end_trans;

	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
	if (error)
		goto out_end_trans;

	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
			       IF2DT(old_mode));
	if (error)
		goto out_end_trans;

	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
			       IF2DT(new_mode));
	if (error)
		goto out_end_trans;

	if (odip != ndip) {
		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
			inc_nlink(&odip->i_inode);
			drop_nlink(&ndip->i_inode);
		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
			inc_nlink(&ndip->i_inode);
			drop_nlink(&odip->i_inode);
		}
	}
	mark_inode_dirty(&ndip->i_inode);
	if (odip != ndip)
		mark_inode_dirty(&odip->i_inode);

out_end_trans:
	gfs2_trans_end(sdp);
out_gunlock:
	while (x--) {
		gfs2_glock_dq(ghs + x);
		gfs2_holder_uninit(ghs + x);
	}
out_gunlock_r:
	if (r_gh.gh_gl)
		gfs2_glock_dq_uninit(&r_gh);
out:
	return error;
}

static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
			struct inode *ndir, struct dentry *ndentry,
			unsigned int flags)
{
	flags &= ~RENAME_NOREPLACE;

	if (flags & ~RENAME_EXCHANGE)
		return -EINVAL;

	if (flags & RENAME_EXCHANGE)
		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);

	return gfs2_rename(odir, odentry, ndir, ndentry);
}

1719
/**
A
Al Viro 已提交
1720 1721 1722
 * gfs2_follow_link - Follow a symbolic link
 * @dentry: The dentry of the link
 * @nd: Data that we pass to vfs_follow_link()
1723
 *
A
Al Viro 已提交
1724
 * This can handle symlinks of any size.
1725
 *
A
Al Viro 已提交
1726
 * Returns: 0 on success or error code
1727 1728
 */

1729
static const char *gfs2_follow_link(struct dentry *dentry, void **cookie)
1730
{
1731
	struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
1732 1733
	struct gfs2_holder i_gh;
	struct buffer_head *dibh;
1734
	unsigned int size;
A
Al Viro 已提交
1735
	char *buf;
1736 1737 1738 1739 1740 1741
	int error;

	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
	error = gfs2_glock_nq(&i_gh);
	if (error) {
		gfs2_holder_uninit(&i_gh);
1742
		return ERR_PTR(error);
1743 1744
	}

S
Steven Whitehouse 已提交
1745 1746
	size = (unsigned int)i_size_read(&ip->i_inode);
	if (size == 0) {
1747
		gfs2_consist_inode(ip);
A
Al Viro 已提交
1748
		buf = ERR_PTR(-EIO);
1749 1750 1751 1752
		goto out;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
A
Al Viro 已提交
1753 1754
	if (error) {
		buf = ERR_PTR(error);
1755 1756 1757
		goto out;
	}

1758
	buf = kzalloc(size + 1, GFP_NOFS);
A
Al Viro 已提交
1759 1760 1761
	if (!buf)
		buf = ERR_PTR(-ENOMEM);
	else
1762
		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1763 1764 1765
	brelse(dibh);
out:
	gfs2_glock_dq_uninit(&i_gh);
1766 1767 1768
	if (!IS_ERR(buf))
		*cookie = buf;
	return buf;
D
David Teigland 已提交
1769 1770 1771 1772
}

/**
 * gfs2_permission -
1773 1774 1775
 * @inode: The inode
 * @mask: The mask to be tested
 * @flags: Indicates whether this is an RCU path walk or not
D
David Teigland 已提交
1776
 *
1777 1778 1779 1780
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
 * lock the glock if its not already been done.
 *
D
David Teigland 已提交
1781 1782 1783
 * Returns: errno
 */

1784
int gfs2_permission(struct inode *inode, int mask)
D
David Teigland 已提交
1785
{
1786
	struct gfs2_inode *ip;
D
David Teigland 已提交
1787 1788
	struct gfs2_holder i_gh;
	int error;
1789
	int unlock = 0;
D
David Teigland 已提交
1790

1791 1792

	ip = GFS2_I(inode);
1793
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1794 1795 1796 1797 1798 1799
		if (mask & MAY_NOT_BLOCK)
			return -ECHILD;
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
		if (error)
			return error;
		unlock = 1;
1800
	}
D
David Teigland 已提交
1801

M
Miklos Szeredi 已提交
1802 1803 1804
	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
		error = -EACCES;
	else
1805
		error = generic_permission(inode, mask);
1806
	if (unlock)
D
David Teigland 已提交
1807 1808 1809 1810 1811
		gfs2_glock_dq_uninit(&i_gh);

	return error;
}

S
Steven Whitehouse 已提交
1812
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
{
	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
}

/**
 * gfs2_setattr_simple -
 * @ip:
 * @attr:
 *
 * Returns: errno
 */

S
Steven Whitehouse 已提交
1827
int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1828 1829 1830 1831
{
	int error;

	if (current->journal_info)
S
Steven Whitehouse 已提交
1832
		return __gfs2_setattr_simple(inode, attr);
1833

S
Steven Whitehouse 已提交
1834
	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1835 1836 1837
	if (error)
		return error;

S
Steven Whitehouse 已提交
1838 1839
	error = __gfs2_setattr_simple(inode, attr);
	gfs2_trans_end(GFS2_SB(inode));
1840 1841 1842
	return error;
}

D
David Teigland 已提交
1843 1844
static int setattr_chown(struct inode *inode, struct iattr *attr)
{
1845 1846
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_sbd *sdp = GFS2_SB(inode);
1847 1848
	kuid_t ouid, nuid;
	kgid_t ogid, ngid;
D
David Teigland 已提交
1849
	int error;
1850
	struct gfs2_alloc_parms ap;
D
David Teigland 已提交
1851

1852 1853
	ouid = inode->i_uid;
	ogid = inode->i_gid;
D
David Teigland 已提交
1854 1855 1856
	nuid = attr->ia_uid;
	ngid = attr->ia_gid;

1857
	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1858
		ouid = nuid = NO_UID_QUOTA_CHANGE;
1859
	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1860
		ogid = ngid = NO_GID_QUOTA_CHANGE;
D
David Teigland 已提交
1861

1862
	error = get_write_access(inode);
D
David Teigland 已提交
1863
	if (error)
1864
		return error;
D
David Teigland 已提交
1865

1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
	error = gfs2_rs_alloc(ip);
	if (error)
		goto out;

	error = gfs2_rindex_update(sdp);
	if (error)
		goto out;

	error = gfs2_quota_lock(ip, nuid, ngid);
	if (error)
		goto out;

1878 1879
	ap.target = gfs2_get_inode_blocks(&ip->i_inode);

1880 1881
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1882
		error = gfs2_quota_check(ip, nuid, ngid, &ap);
D
David Teigland 已提交
1883 1884 1885 1886 1887 1888 1889 1890
		if (error)
			goto out_gunlock_q;
	}

	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
	if (error)
		goto out_gunlock_q;

S
Steven Whitehouse 已提交
1891
	error = gfs2_setattr_simple(inode, attr);
D
David Teigland 已提交
1892 1893 1894
	if (error)
		goto out_end_trans;

1895 1896
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1897
		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1898
		gfs2_quota_change(ip, ap.target, nuid, ngid);
D
David Teigland 已提交
1899 1900
	}

1901
out_end_trans:
D
David Teigland 已提交
1902
	gfs2_trans_end(sdp);
1903
out_gunlock_q:
D
David Teigland 已提交
1904
	gfs2_quota_unlock(ip);
1905 1906
out:
	put_write_access(inode);
D
David Teigland 已提交
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
	return error;
}

/**
 * gfs2_setattr - Change attributes on an inode
 * @dentry: The dentry which is changing
 * @attr: The structure describing the change
 *
 * The VFS layer wants to change one or more of an inodes attributes.  Write
 * that change out to disk.
 *
 * Returns: errno
 */

static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
{
1923
	struct inode *inode = d_inode(dentry);
1924
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1925 1926 1927
	struct gfs2_holder i_gh;
	int error;

1928 1929 1930 1931
	error = gfs2_rs_alloc(ip);
	if (error)
		return error;

D
David Teigland 已提交
1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
	if (error)
		return error;

	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out;

	error = inode_change_ok(inode, attr);
	if (error)
		goto out;

	if (attr->ia_valid & ATTR_SIZE)
S
Steven Whitehouse 已提交
1945
		error = gfs2_setattr_size(inode, attr->ia_size);
D
David Teigland 已提交
1946 1947
	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
		error = setattr_chown(inode, attr);
1948
	else {
S
Steven Whitehouse 已提交
1949
		error = gfs2_setattr_simple(inode, attr);
1950 1951 1952
		if (!error && attr->ia_valid & ATTR_MODE)
			error = posix_acl_chmod(inode, inode->i_mode);
	}
D
David Teigland 已提交
1953

1954
out:
D
David Teigland 已提交
1955 1956
	if (!error)
		mark_inode_dirty(inode);
S
Steven Whitehouse 已提交
1957
	gfs2_glock_dq_uninit(&i_gh);
D
David Teigland 已提交
1958 1959 1960 1961 1962
	return error;
}

/**
 * gfs2_getattr - Read out an inode's attributes
1963
 * @mnt: The vfsmount the inode is being accessed from
D
David Teigland 已提交
1964 1965 1966
 * @dentry: The dentry to stat
 * @stat: The inode's stats
 *
1967 1968 1969 1970 1971 1972
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
 * lock the glock if its not already been done. Note that its the NFS
 * readdirplus operation which causes this to be called (from filldir)
 * with the glock already held.
 *
D
David Teigland 已提交
1973 1974 1975 1976 1977 1978
 * Returns: errno
 */

static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
			struct kstat *stat)
{
1979
	struct inode *inode = d_inode(dentry);
1980
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1981 1982
	struct gfs2_holder gh;
	int error;
1983
	int unlock = 0;
D
David Teigland 已提交
1984

1985
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1986 1987 1988 1989
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
		if (error)
			return error;
		unlock = 1;
D
David Teigland 已提交
1990 1991
	}

1992
	generic_fillattr(inode, stat);
1993
	if (unlock)
1994 1995 1996
		gfs2_glock_dq_uninit(&gh);

	return 0;
D
David Teigland 已提交
1997 1998 1999 2000 2001
}

static int gfs2_setxattr(struct dentry *dentry, const char *name,
			 const void *data, size_t size, int flags)
{
2002
	struct inode *inode = d_inode(dentry);
2003 2004 2005
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
2006

2007 2008 2009
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
2010 2011 2012
		ret = gfs2_rs_alloc(ip);
		if (ret == 0)
			ret = generic_setxattr(dentry, name, data, size, flags);
2013 2014 2015 2016
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2017 2018 2019 2020 2021
}

static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
			     void *data, size_t size)
{
2022
	struct inode *inode = d_inode(dentry);
2023 2024 2025
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
2026

2027 2028 2029 2030
	/* For selinux during lookup */
	if (gfs2_glock_is_locked_by_me(ip->i_gl))
		return generic_getxattr(dentry, name, data, size);

2031 2032 2033 2034 2035 2036 2037 2038
	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
		ret = generic_getxattr(dentry, name, data, size);
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2039 2040 2041 2042
}

static int gfs2_removexattr(struct dentry *dentry, const char *name)
{
2043
	struct inode *inode = d_inode(dentry);
2044 2045 2046
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
2047

2048 2049 2050
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
2051 2052 2053
		ret = gfs2_rs_alloc(ip);
		if (ret == 0)
			ret = generic_removexattr(dentry, name);
2054 2055 2056 2057
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2058 2059
}

2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101
static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		       u64 start, u64 len)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;

	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
	if (ret)
		return ret;

	mutex_lock(&inode->i_mutex);

	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
	if (ret)
		goto out;

	if (gfs2_is_stuffed(ip)) {
		u64 phys = ip->i_no_addr << inode->i_blkbits;
		u64 size = i_size_read(inode);
		u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
			    FIEMAP_EXTENT_DATA_INLINE;
		phys += sizeof(struct gfs2_dinode);
		phys += start;
		if (start + len > size)
			len = size - start;
		if (start < size)
			ret = fiemap_fill_next_extent(fieinfo, start, phys,
						      len, flags);
		if (ret == 1)
			ret = 0;
	} else {
		ret = __generic_block_fiemap(inode, fieinfo, start, len,
					     gfs2_block_map);
	}

	gfs2_glock_dq_uninit(&gh);
out:
	mutex_unlock(&inode->i_mutex);
	return ret;
}

2102
const struct inode_operations gfs2_file_iops = {
2103
	.permission = gfs2_permission,
D
David Teigland 已提交
2104 2105 2106 2107 2108 2109
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2110
	.fiemap = gfs2_fiemap,
2111
	.get_acl = gfs2_get_acl,
2112
	.set_acl = gfs2_set_acl,
D
David Teigland 已提交
2113 2114
};

2115
const struct inode_operations gfs2_dir_iops = {
D
David Teigland 已提交
2116 2117 2118 2119 2120 2121
	.create = gfs2_create,
	.lookup = gfs2_lookup,
	.link = gfs2_link,
	.unlink = gfs2_unlink,
	.symlink = gfs2_symlink,
	.mkdir = gfs2_mkdir,
2122
	.rmdir = gfs2_unlink,
D
David Teigland 已提交
2123
	.mknod = gfs2_mknod,
2124
	.rename2 = gfs2_rename2,
2125
	.permission = gfs2_permission,
D
David Teigland 已提交
2126 2127 2128 2129 2130 2131
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2132
	.fiemap = gfs2_fiemap,
2133
	.get_acl = gfs2_get_acl,
2134
	.set_acl = gfs2_set_acl,
2135
	.atomic_open = gfs2_atomic_open,
D
David Teigland 已提交
2136 2137
};

2138
const struct inode_operations gfs2_symlink_iops = {
A
Al Viro 已提交
2139
	.readlink = generic_readlink,
D
David Teigland 已提交
2140
	.follow_link = gfs2_follow_link,
A
Al Viro 已提交
2141
	.put_link = kfree_put_link,
2142
	.permission = gfs2_permission,
D
David Teigland 已提交
2143 2144 2145 2146 2147 2148
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2149
	.fiemap = gfs2_fiemap,
D
David Teigland 已提交
2150 2151
};