inode.c 48.3 KB
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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
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 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
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 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
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 * of the GNU General Public License version 2.
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 */

#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>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/fiemap.h>
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#include <linux/security.h>
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#include <asm/uaccess.h>

#include "gfs2.h"
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#include "incore.h"
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#include "acl.h"
#include "bmap.h"
#include "dir.h"
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#include "xattr.h"
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#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
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#include "util.h"
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#include "super.h"
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#include "glops.h"

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struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
41
{
42
	return ilookup(sb, (unsigned long)no_addr);
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}

/**
 * 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
 *
 * Returns: A VFS inode, or an error
 */

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

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	inode = iget_locked(sb, (unsigned long)no_addr);
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	ip = GFS2_I(inode);
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	ip->i_no_addr = no_addr;
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	if (!inode)
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		return ERR_PTR(-ENOMEM);
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	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:
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	ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
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	ip->i_iopen_gh.gh_gl->gl_object = NULL;
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	gfs2_glock_dq_wait(&ip->i_iopen_gh);
	gfs2_holder_uninit(&ip->i_iopen_gh);
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fail_iopen:
	if (io_gl)
		gfs2_glock_put(io_gl);
fail_put:
	ip->i_gl->gl_object = NULL;
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;

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	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0);
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	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 &&
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	     dir == d_inode(sb->s_root))) {
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		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) {
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		error = gfs2_permission(dir, MAY_EXEC);
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		if (error)
			goto out;
	}

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	inode = gfs2_dir_search(dir, name, false);
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	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,
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		     umode_t mode)
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{
	int error;

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	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
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	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;
}

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static void munge_mode_uid_gid(const struct gfs2_inode *dip,
			       struct inode *inode)
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{
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
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	    (dip->i_inode.i_mode & S_ISUID) &&
	    !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
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		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISUID;
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		else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
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			inode->i_mode &= ~07111;
		inode->i_uid = dip->i_inode.i_uid;
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	} else
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		inode->i_uid = current_fsuid();
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	if (dip->i_inode.i_mode & S_ISGID) {
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		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISGID;
		inode->i_gid = dip->i_inode.i_gid;
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	} else
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		inode->i_gid = current_fsgid();
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}

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static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
328
{
329
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
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	int error;

333
	error = gfs2_quota_lock_check(ip, &ap);
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	if (error)
		goto out;

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	error = gfs2_inplace_reserve(ip, &ap);
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	if (error)
		goto out_quota;

341
	error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
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	if (error)
		goto out_ipreserv;

345
	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
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	ip->i_no_formal_ino = ip->i_generation;
	ip->i_inode.i_ino = ip->i_no_addr;
	ip->i_goal = ip->i_no_addr;
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	gfs2_trans_end(sdp);

out_ipreserv:
353
	gfs2_inplace_release(ip);
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out_quota:
	gfs2_quota_unlock(ip);
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out:
	return error;
}

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static void gfs2_init_dir(struct buffer_head *dibh,
			  const struct gfs2_inode *parent)
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{
	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);
	
}

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/**
 * 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);
}

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/**
 * init_dinode - Fill in a new dinode structure
406
 * @dip: The directory this inode is being created in
407
 * @ip: The inode
408 409
 * @symname: The symlink destination (if a symlink)
 * @bhp: The buffer head (returned to caller)
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 *
 */

413
static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
414
			const char *symname)
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{
	struct gfs2_dinode *di;
	struct buffer_head *dibh;

419
	dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
420
	gfs2_trans_add_meta(ip->i_gl, dibh);
421
	di = (struct gfs2_dinode *)dibh->b_data;
422
	gfs2_dinode_out(ip, di);
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424 425
	di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
	di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
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	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));
431
	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
432

433
	switch(ip->i_inode.i_mode & S_IFMT) {
434
	case S_IFDIR:
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		gfs2_init_dir(dibh, dip);
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		break;
	case S_IFLNK:
438
		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
439
		break;
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	}

442
	set_buffer_uptodate(dibh);
443
	brelse(dibh);
444 445
}

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/**
 * 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;
}

468
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
469
		       struct gfs2_inode *ip, struct gfs2_diradd *da)
470 471
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
472
	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
473 474
	int error;

475
	if (da->nr_blocks) {
476
		error = gfs2_quota_lock_check(dip, &ap);
477 478 479
		if (error)
			goto fail_quota_locks;

480
		error = gfs2_inplace_reserve(dip, &ap);
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		if (error)
			goto fail_quota_locks;

484
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
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		if (error)
			goto fail_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
		if (error)
			goto fail_quota_locks;
	}

493
	error = gfs2_dir_add(&dip->i_inode, name, ip, da);
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	gfs2_trans_end(sdp);
fail_ipreserv:
497
	gfs2_inplace_release(dip);
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fail_quota_locks:
	gfs2_quota_unlock(dip);
	return error;
}

503
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
504
		    void *fs_info)
505
{
506 507 508 509 510 511 512 513 514
	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;
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	}
	return err;
}
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519
/**
520 521 522
 * gfs2_create_inode - Create a new inode
 * @dir: The parent directory
 * @dentry: The new dentry
523
 * @file: If non-NULL, the file which is being opened
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 * @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)
528
 *
529
 * Returns: 0 on success, or error code
530 531
 */

532
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
533
			     struct file *file,
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			     umode_t mode, dev_t dev, const char *symname,
535
			     unsigned int size, int excl, int *opened)
536
{
537
	const struct qstr *name = &dentry->d_name;
538
	struct posix_acl *default_acl, *acl;
539
	struct gfs2_holder ghs[2];
540
	struct inode *inode = NULL;
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541
	struct gfs2_inode *dip = GFS2_I(dir), *ip;
542
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
543
	struct gfs2_glock *io_gl = NULL;
544
	int error, free_vfs_inode = 1;
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	u32 aflags = 0;
546
	unsigned blocks = 1;
547
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
548 549

	if (!name->len || name->len > GFS2_FNAMESIZE)
550
		return -ENAMETOOLONG;
551

552
	error = gfs2_rsqa_alloc(dip);
553 554 555
	if (error)
		return error;

556 557 558 559
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

560
	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
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	if (error)
		goto fail;

	error = create_ok(dip, name, mode);
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	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)) {
571 572 573 574 575
		if (S_ISDIR(inode->i_mode)) {
			iput(inode);
			inode = ERR_PTR(-EISDIR);
			goto fail_gunlock;
		}
576
		d_instantiate(dentry, inode);
577
		error = 0;
578
		if (file) {
579
			if (S_ISREG(inode->i_mode))
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				error = finish_open(file, dentry, gfs2_open_common, opened);
581 582
			else
				error = finish_no_open(file, NULL);
583
		}
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		gfs2_glock_dq_uninit(ghs);
585
		return error;
586
	} else if (error != -ENOENT) {
587
		goto fail_gunlock;
588
	}
589

590
	error = gfs2_diradd_alloc_required(dir, name, &da);
591 592 593
	if (error < 0)
		goto fail_gunlock;

594
	inode = new_inode(sdp->sd_vfs);
595 596 597 598
	error = -ENOMEM;
	if (!inode)
		goto fail_gunlock;

599 600
	error = posix_acl_create(dir, &mode, &default_acl, &acl);
	if (error)
601
		goto fail_gunlock;
602

603
	ip = GFS2_I(inode);
604
	error = gfs2_rsqa_alloc(ip);
605
	if (error)
606
		goto fail_free_acls;
607 608

	inode->i_mode = mode;
609
	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
610 611
	inode->i_rdev = dev;
	inode->i_size = size;
612
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
613
	gfs2_set_inode_blocks(inode, 1);
614
	munge_mode_uid_gid(dip, inode);
615
	check_and_update_goal(dip);
616
	ip->i_goal = dip->i_goal;
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635
	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;
	}
636 637 638 639 640

	/* 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;

641
	gfs2_set_inode_flags(inode);
642

643
	if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
S
Steven Whitehouse 已提交
644 645 646
	    (dip->i_diskflags & GFS2_DIF_TOPDIR))
		aflags |= GFS2_AF_ORLOV;

647 648 649 650
	if (default_acl || acl)
		blocks++;

	error = alloc_dinode(ip, aflags, &blocks);
651
	if (error)
652
		goto fail_free_inode;
653

654 655
	gfs2_set_inode_blocks(inode, blocks);

656
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
657
	if (error)
658
		goto fail_free_inode;
659

660
	ip->i_gl->gl_object = ip;
661 662 663 664
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
	if (error)
		goto fail_free_inode;

665
	error = gfs2_trans_begin(sdp, blocks, 0);
666
	if (error)
667 668
		goto fail_gunlock2;

669 670 671 672
	if (blocks > 1) {
		ip->i_eattr = ip->i_no_addr + 1;
		gfs2_init_xattr(ip);
	}
673
	init_dinode(dip, ip, symname);
674 675
	gfs2_trans_end(sdp);

676
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
677 678 679
	if (error)
		goto fail_gunlock2;

680 681
	BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));

682
	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
683 684
	if (error)
		goto fail_gunlock2;
685

686 687 688 689 690
	ip->i_iopen_gh.gh_gl->gl_object = ip;
	gfs2_glock_put(io_gl);
	gfs2_set_iop(inode);
	insert_inode_hash(inode);

691 692 693
	free_vfs_inode = 0; /* After this point, the inode is no longer
			       considered free. Any failures need to undo
			       the gfs2 structures. */
694 695 696 697 698 699 700 701 702 703
	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);
	}

704
	if (error)
705
		goto fail_gunlock3;
706

707 708
	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
					     &gfs2_initxattrs, NULL);
709
	if (error)
710
		goto fail_gunlock3;
711

712
	error = link_dinode(dip, name, ip, &da);
713
	if (error)
714
		goto fail_gunlock3;
715

716
	mark_inode_dirty(inode);
717
	d_instantiate(dentry, inode);
M
Miklos Szeredi 已提交
718 719
	if (file) {
		*opened |= FILE_CREATED;
720
		error = finish_open(file, dentry, gfs2_open_common, opened);
M
Miklos Szeredi 已提交
721
	}
722 723
	gfs2_glock_dq_uninit(ghs);
	gfs2_glock_dq_uninit(ghs + 1);
724
	clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
725
	return error;
726

727
fail_gunlock3:
728 729
	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
	gfs2_glock_put(io_gl);
730
fail_gunlock2:
731 732
	if (io_gl)
		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
733
	gfs2_glock_dq_uninit(ghs + 1);
734 735 736
fail_free_inode:
	if (ip->i_gl)
		gfs2_glock_put(ip->i_gl);
737
	gfs2_rsqa_delete(ip, NULL);
738 739 740 741 742
fail_free_acls:
	if (default_acl)
		posix_acl_release(default_acl);
	if (acl)
		posix_acl_release(acl);
743
fail_gunlock:
744
	gfs2_dir_no_add(&da);
745
	gfs2_glock_dq_uninit(ghs);
746
	if (inode && !IS_ERR(inode)) {
747
		clear_nlink(inode);
748 749 750 751
		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);
752 753
		iput(inode);
	}
754
fail:
755
	return error;
756
}
757

D
David Teigland 已提交
758 759 760 761 762 763 764 765 766 767
/**
 * 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
768
		       umode_t mode, bool excl)
D
David Teigland 已提交
769
{
770
	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
D
David Teigland 已提交
771 772 773
}

/**
774
 * __gfs2_lookup - Look up a filename in a directory and return its inode
D
David Teigland 已提交
775 776
 * @dir: The directory inode
 * @dentry: The dentry of the new inode
777 778
 * @file: File to be opened
 * @opened: atomic_open flags
D
David Teigland 已提交
779 780 781 782 783
 *
 *
 * Returns: errno
 */

784 785
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
				    struct file *file, int *opened)
D
David Teigland 已提交
786
{
787 788 789 790 791 792 793
	struct inode *inode;
	struct dentry *d;
	struct gfs2_holder gh;
	struct gfs2_glock *gl;
	int error;

	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
794 795
	if (inode == NULL) {
		d_add(dentry, NULL);
796
		return NULL;
797
	}
798 799 800 801 802 803 804 805
	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);
806
	}
807 808

	d = d_splice_alias(inode, dentry);
809 810 811 812
	if (IS_ERR(d)) {
		gfs2_glock_dq_uninit(&gh);
		return d;
	}
813 814 815 816
	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
817 818
	if (error) {
		dput(d);
819
		return ERR_PTR(error);
M
Miklos Szeredi 已提交
820
	}
821 822 823 824 825 826 827
	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
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
}

/**
 * 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)
{
845 846
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
847
	struct inode *inode = d_inode(old_dentry);
848
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
849
	struct gfs2_holder ghs[2];
850
	struct buffer_head *dibh;
851
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
D
David Teigland 已提交
852 853
	int error;

854
	if (S_ISDIR(inode->i_mode))
D
David Teigland 已提交
855 856
		return -EPERM;

857
	error = gfs2_rsqa_alloc(dip);
858 859 860
	if (error)
		return error;

D
David Teigland 已提交
861 862 863
	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);

864 865 866 867 868
	error = gfs2_glock_nq(ghs); /* parent */
	if (error)
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
D
David Teigland 已提交
869
	if (error)
870
		goto out_child;
D
David Teigland 已提交
871

872 873 874 875
	error = -ENOENT;
	if (inode->i_nlink == 0)
		goto out_gunlock;

876
	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
877 878 879
	if (error)
		goto out_gunlock;

880
	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
D
David Teigland 已提交
881 882 883 884 885 886 887 888 889 890
	switch (error) {
	case -ENOENT:
		break;
	case 0:
		error = -EEXIST;
	default:
		goto out_gunlock;
	}

	error = -EINVAL;
891
	if (!dip->i_inode.i_nlink)
D
David Teigland 已提交
892 893
		goto out_gunlock;
	error = -EFBIG;
894
	if (dip->i_entries == (u32)-1)
D
David Teigland 已提交
895 896 897 898 899
		goto out_gunlock;
	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out_gunlock;
	error = -EINVAL;
900
	if (!ip->i_inode.i_nlink)
D
David Teigland 已提交
901 902
		goto out_gunlock;
	error = -EMLINK;
903
	if (ip->i_inode.i_nlink == (u32)-1)
D
David Teigland 已提交
904 905
		goto out_gunlock;

906
	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
907
	if (error < 0)
D
David Teigland 已提交
908 909
		goto out_gunlock;

910 911
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
912
		error = gfs2_quota_lock_check(dip, &ap);
D
David Teigland 已提交
913
		if (error)
914
			goto out_gunlock;
D
David Teigland 已提交
915

916
		error = gfs2_inplace_reserve(dip, &ap);
D
David Teigland 已提交
917 918 919
		if (error)
			goto out_gunlock_q;

920
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
D
David Teigland 已提交
921 922 923 924 925 926 927 928
		if (error)
			goto out_ipres;
	} else {
		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
		if (error)
			goto out_ipres;
	}

929
	error = gfs2_meta_inode_buffer(ip, &dibh);
D
David Teigland 已提交
930 931 932
	if (error)
		goto out_end_trans;

933
	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
934 935 936
	if (error)
		goto out_brelse;

937
	gfs2_trans_add_meta(ip->i_gl, dibh);
938 939
	inc_nlink(&ip->i_inode);
	ip->i_inode.i_ctime = CURRENT_TIME;
S
Steven Whitehouse 已提交
940 941 942
	ihold(inode);
	d_instantiate(dentry, inode);
	mark_inode_dirty(inode);
D
David Teigland 已提交
943

944 945
out_brelse:
	brelse(dibh);
946
out_end_trans:
D
David Teigland 已提交
947
	gfs2_trans_end(sdp);
948
out_ipres:
949
	if (da.nr_blocks)
D
David Teigland 已提交
950
		gfs2_inplace_release(dip);
951
out_gunlock_q:
952
	if (da.nr_blocks)
D
David Teigland 已提交
953
		gfs2_quota_unlock(dip);
954
out_gunlock:
955
	gfs2_dir_no_add(&da);
956 957 958 959
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
D
David Teigland 已提交
960 961 962 963 964
	gfs2_holder_uninit(ghs);
	gfs2_holder_uninit(ghs + 1);
	return error;
}

965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
/*
 * 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) &&
985 986
	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
987 988 989 990 991
		return -EPERM;

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

992
	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
993 994 995
	if (error)
		return error;

996
	return gfs2_dir_check(&dip->i_inode, name, ip);
997 998
}

D
David Teigland 已提交
999
/**
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
 * 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,
1012
			     const struct dentry *dentry)
1013
{
1014
	struct inode *inode = d_inode(dentry);
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
	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
1038 1039
 * @dentry: The file itself
 *
1040 1041
 * 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
1042 1043 1044 1045 1046 1047
 *
 * Returns: errno
 */

static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
{
1048 1049
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1050
	struct inode *inode = d_inode(dentry);
1051
	struct gfs2_inode *ip = GFS2_I(inode);
R
Russell Cattelan 已提交
1052 1053
	struct gfs2_holder ghs[3];
	struct gfs2_rgrpd *rgd;
1054 1055 1056 1057 1058 1059 1060
	int error;

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

	error = -EROFS;
D
David Teigland 已提交
1061 1062

	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
R
Russell Cattelan 已提交
1063
	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
D
David Teigland 已提交
1064

S
Steven Whitehouse 已提交
1065
	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1066
	if (!rgd)
1067
		goto out_inodes;
1068

R
Russell Cattelan 已提交
1069 1070 1071
	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);


1072
	error = gfs2_glock_nq(ghs); /* parent */
D
David Teigland 已提交
1073
	if (error)
1074 1075 1076 1077 1078 1079
		goto out_parent;

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

1080
	error = -ENOENT;
1081
	if (inode->i_nlink == 0)
1082 1083
		goto out_rgrp;

1084 1085 1086 1087 1088 1089
	if (S_ISDIR(inode->i_mode)) {
		error = -ENOTEMPTY;
		if (ip->i_entries > 2 || inode->i_nlink > 2)
			goto out_rgrp;
	}

1090 1091 1092
	error = gfs2_glock_nq(ghs + 2); /* rgrp */
	if (error)
		goto out_rgrp;
D
David Teigland 已提交
1093 1094 1095

	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
	if (error)
1096
		goto out_gunlock;
D
David Teigland 已提交
1097

1098 1099 1100
	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
1101

1102
	error = gfs2_unlink_inode(dip, dentry);
D
David Teigland 已提交
1103

1104 1105
out_end_trans:
	gfs2_trans_end(sdp);
1106
out_gunlock:
1107 1108 1109 1110 1111 1112
	gfs2_glock_dq(ghs + 2);
out_rgrp:
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
1113 1114 1115
	gfs2_holder_uninit(ghs + 2);
out_inodes:
	gfs2_holder_uninit(ghs + 1);
1116
	gfs2_holder_uninit(ghs);
D
David Teigland 已提交
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
	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)
{
1132
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1133
	unsigned int size;
D
David Teigland 已提交
1134 1135 1136 1137 1138

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

1139
	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
D
David Teigland 已提交
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
}

/**
 * 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
 */

1151
static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
D
David Teigland 已提交
1152
{
1153 1154
	struct gfs2_sbd *sdp = GFS2_SB(dir);
	unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1155
	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
D
David Teigland 已提交
1156 1157 1158 1159 1160 1161 1162
}

/**
 * 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
1163
 * @dev: The device specification of the special file
D
David Teigland 已提交
1164 1165 1166
 *
 */

A
Al Viro 已提交
1167
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
D
David Teigland 已提交
1168 1169
		      dev_t dev)
{
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
	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,
1186 1187
			    struct file *file, unsigned flags,
			    umode_t mode, int *opened)
1188 1189 1190 1191
{
	struct dentry *d;
	bool excl = !!(flags & O_EXCL);

1192 1193 1194
	if (!d_unhashed(dentry))
		goto skip_lookup;

1195 1196 1197
	d = __gfs2_lookup(dir, dentry, file, opened);
	if (IS_ERR(d))
		return PTR_ERR(d);
M
Miklos Szeredi 已提交
1198 1199
	if (d != NULL)
		dentry = d;
1200
	if (d_really_is_positive(dentry)) {
1201 1202
		if (!(*opened & FILE_OPENED))
			return finish_no_open(file, d);
M
Miklos Szeredi 已提交
1203
		dput(d);
1204 1205 1206
		return 0;
	}

M
Miklos Szeredi 已提交
1207
	BUG_ON(d != NULL);
1208 1209

skip_lookup:
1210 1211 1212 1213
	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
1214 1215
}

1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
/*
 * 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;
		}
1241
		if (dir == d_inode(sb->s_root)) {
1242 1243 1244 1245
			error = 0;
			break;
		}

1246
		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1247 1248 1249 1250
		if (!tmp) {
			error = -ENOENT;
			break;
		}
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
		if (IS_ERR(tmp)) {
			error = PTR_ERR(tmp);
			break;
		}

		iput(dir);
		dir = tmp;
	}

	iput(dir);

	return error;
}

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 1290 1291 1292 1293
/**
 * 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
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
/**
 * 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)
{
1307 1308
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
1309
	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
D
David Teigland 已提交
1310
	struct gfs2_inode *nip = NULL;
1311
	struct gfs2_sbd *sdp = GFS2_SB(odir);
1312
	struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
R
Russell Cattelan 已提交
1313
	struct gfs2_rgrpd *nrgd;
D
David Teigland 已提交
1314 1315
	unsigned int num_gh;
	int dir_rename = 0;
1316
	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
D
David Teigland 已提交
1317 1318 1319
	unsigned int x;
	int error;

1320 1321
	if (d_really_is_positive(ndentry)) {
		nip = GFS2_I(d_inode(ndentry));
D
David Teigland 已提交
1322 1323 1324 1325
		if (ip == nip)
			return 0;
	}

1326 1327 1328 1329
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

1330
	error = gfs2_rsqa_alloc(ndip);
1331 1332 1333
	if (error)
		return error;

1334 1335 1336
	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
D
David Teigland 已提交
1337 1338 1339
		if (error)
			goto out;

1340 1341
		if (S_ISDIR(ip->i_inode.i_mode)) {
			dir_rename = 1;
1342
			/* don't move a directory into its subdir */
1343 1344 1345 1346
			error = gfs2_ok_to_move(ip, ndip);
			if (error)
				goto out_gunlock_r;
		}
D
David Teigland 已提交
1347 1348
	}

1349
	num_gh = 1;
D
David Teigland 已提交
1350
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1351 1352 1353 1354 1355 1356
	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
1357

1358 1359 1360
	if (nip) {
		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
R
Russell Cattelan 已提交
1361 1362 1363 1364
		/* 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
1365
		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
R
Russell Cattelan 已提交
1366 1367
		if (nrgd)
			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1368
	}
D
David Teigland 已提交
1369

1370 1371 1372 1373 1374
	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1375

1376 1377 1378 1379
	error = -ENOENT;
	if (ip->i_inode.i_nlink == 0)
		goto out_gunlock;

D
David Teigland 已提交
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
	/* 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;

1393 1394 1395 1396 1397
		if (nip->i_inode.i_nlink == 0) {
			error = -EAGAIN;
			goto out_gunlock;
		}

1398
		if (S_ISDIR(nip->i_inode.i_mode)) {
1399
			if (nip->i_entries < 2) {
1400
				gfs2_consist_inode(nip);
D
David Teigland 已提交
1401 1402 1403
				error = -EIO;
				goto out_gunlock;
			}
1404
			if (nip->i_entries > 2) {
D
David Teigland 已提交
1405 1406 1407 1408 1409
				error = -ENOTEMPTY;
				goto out_gunlock;
			}
		}
	} else {
1410
		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
1411 1412 1413
		if (error)
			goto out_gunlock;

1414
		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
D
David Teigland 已提交
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
		switch (error) {
		case -ENOENT:
			error = 0;
			break;
		case 0:
			error = -EEXIST;
		default:
			goto out_gunlock;
		};

		if (odip != ndip) {
1426
			if (!ndip->i_inode.i_nlink) {
1427
				error = -ENOENT;
D
David Teigland 已提交
1428 1429
				goto out_gunlock;
			}
1430
			if (ndip->i_entries == (u32)-1) {
D
David Teigland 已提交
1431 1432 1433
				error = -EFBIG;
				goto out_gunlock;
			}
1434
			if (S_ISDIR(ip->i_inode.i_mode) &&
1435
			    ndip->i_inode.i_nlink == (u32)-1) {
D
David Teigland 已提交
1436 1437 1438 1439 1440 1441 1442 1443 1444
				error = -EMLINK;
				goto out_gunlock;
			}
		}
	}

	/* Check out the dir to be renamed */

	if (dir_rename) {
1445
		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
D
David Teigland 已提交
1446 1447 1448 1449
		if (error)
			goto out_gunlock;
	}

1450 1451 1452 1453 1454
	if (nip == NULL) {
		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1455

1456 1457
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1458
		error = gfs2_quota_lock_check(ndip, &ap);
D
David Teigland 已提交
1459
		if (error)
1460
			goto out_gunlock;
D
David Teigland 已提交
1461

1462
		error = gfs2_inplace_reserve(ndip, &ap);
D
David Teigland 已提交
1463 1464 1465
		if (error)
			goto out_gunlock_q;

1466 1467
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
					 4 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1468 1469 1470 1471
		if (error)
			goto out_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
S
S. Wendy Cheng 已提交
1472
					 5 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1473 1474 1475 1476 1477 1478
		if (error)
			goto out_gunlock;
	}

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

1479 1480
	if (nip)
		error = gfs2_unlink_inode(ndip, ndentry);
D
David Teigland 已提交
1481

1482 1483 1484
	error = update_moved_ino(ip, ndip, dir_rename);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1485

1486
	error = gfs2_dir_del(odip, odentry);
D
David Teigland 已提交
1487 1488 1489
	if (error)
		goto out_end_trans;

1490
	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
D
David Teigland 已提交
1491 1492 1493
	if (error)
		goto out_end_trans;

1494
out_end_trans:
D
David Teigland 已提交
1495
	gfs2_trans_end(sdp);
1496
out_ipreserv:
1497
	if (da.nr_blocks)
D
David Teigland 已提交
1498
		gfs2_inplace_release(ndip);
1499
out_gunlock_q:
1500
	if (da.nr_blocks)
D
David Teigland 已提交
1501
		gfs2_quota_unlock(ndip);
1502
out_gunlock:
1503
	gfs2_dir_no_add(&da);
1504 1505
	while (x--) {
		gfs2_glock_dq(ghs + x);
D
David Teigland 已提交
1506
		gfs2_holder_uninit(ghs + x);
1507
	}
1508
out_gunlock_r:
1509
	if (r_gh.gh_gl)
D
David Teigland 已提交
1510
		gfs2_glock_dq_uninit(&r_gh);
1511
out:
D
David Teigland 已提交
1512 1513 1514
	return error;
}

1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 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
/**
 * 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);
}

1670
/**
1671
 * gfs2_get_link - Follow a symbolic link
A
Al Viro 已提交
1672
 * @dentry: The dentry of the link
1673
 * @inode: The inode of the link
1674
 * @done: destructor for return value
1675
 *
A
Al Viro 已提交
1676
 * This can handle symlinks of any size.
1677
 *
A
Al Viro 已提交
1678
 * Returns: 0 on success or error code
1679 1680
 */

1681
static const char *gfs2_get_link(struct dentry *dentry,
1682 1683
				 struct inode *inode,
				 struct delayed_call *done)
1684
{
1685
	struct gfs2_inode *ip = GFS2_I(inode);
1686 1687
	struct gfs2_holder i_gh;
	struct buffer_head *dibh;
1688
	unsigned int size;
A
Al Viro 已提交
1689
	char *buf;
1690 1691
	int error;

1692 1693 1694
	if (!dentry)
		return ERR_PTR(-ECHILD);

1695 1696 1697 1698
	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);
1699
		return ERR_PTR(error);
1700 1701
	}

S
Steven Whitehouse 已提交
1702 1703
	size = (unsigned int)i_size_read(&ip->i_inode);
	if (size == 0) {
1704
		gfs2_consist_inode(ip);
A
Al Viro 已提交
1705
		buf = ERR_PTR(-EIO);
1706 1707 1708 1709
		goto out;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
A
Al Viro 已提交
1710 1711
	if (error) {
		buf = ERR_PTR(error);
1712 1713 1714
		goto out;
	}

1715
	buf = kzalloc(size + 1, GFP_NOFS);
A
Al Viro 已提交
1716 1717 1718
	if (!buf)
		buf = ERR_PTR(-ENOMEM);
	else
1719
		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1720 1721 1722
	brelse(dibh);
out:
	gfs2_glock_dq_uninit(&i_gh);
1723
	if (!IS_ERR(buf))
1724
		set_delayed_call(done, kfree_link, buf);
1725
	return buf;
D
David Teigland 已提交
1726 1727 1728 1729
}

/**
 * gfs2_permission -
1730 1731 1732
 * @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
1733
 *
1734 1735 1736 1737
 * 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
1738 1739 1740
 * Returns: errno
 */

1741
int gfs2_permission(struct inode *inode, int mask)
D
David Teigland 已提交
1742
{
1743
	struct gfs2_inode *ip;
D
David Teigland 已提交
1744 1745
	struct gfs2_holder i_gh;
	int error;
1746
	int unlock = 0;
D
David Teigland 已提交
1747

1748 1749

	ip = GFS2_I(inode);
1750
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1751 1752 1753 1754 1755 1756
		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;
1757
	}
D
David Teigland 已提交
1758

M
Miklos Szeredi 已提交
1759 1760 1761
	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
		error = -EACCES;
	else
1762
		error = generic_permission(inode, mask);
1763
	if (unlock)
D
David Teigland 已提交
1764 1765 1766 1767 1768
		gfs2_glock_dq_uninit(&i_gh);

	return error;
}

S
Steven Whitehouse 已提交
1769
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
{
	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
}

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

S
Steven Whitehouse 已提交
1784
int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1785 1786 1787 1788
{
	int error;

	if (current->journal_info)
S
Steven Whitehouse 已提交
1789
		return __gfs2_setattr_simple(inode, attr);
1790

S
Steven Whitehouse 已提交
1791
	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1792 1793 1794
	if (error)
		return error;

S
Steven Whitehouse 已提交
1795 1796
	error = __gfs2_setattr_simple(inode, attr);
	gfs2_trans_end(GFS2_SB(inode));
1797 1798 1799
	return error;
}

D
David Teigland 已提交
1800 1801
static int setattr_chown(struct inode *inode, struct iattr *attr)
{
1802 1803
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_sbd *sdp = GFS2_SB(inode);
1804 1805
	kuid_t ouid, nuid;
	kgid_t ogid, ngid;
D
David Teigland 已提交
1806
	int error;
1807
	struct gfs2_alloc_parms ap;
D
David Teigland 已提交
1808

1809 1810
	ouid = inode->i_uid;
	ogid = inode->i_gid;
D
David Teigland 已提交
1811 1812 1813
	nuid = attr->ia_uid;
	ngid = attr->ia_gid;

1814
	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1815
		ouid = nuid = NO_UID_QUOTA_CHANGE;
1816
	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1817
		ogid = ngid = NO_GID_QUOTA_CHANGE;
D
David Teigland 已提交
1818

1819
	error = gfs2_rsqa_alloc(ip);
1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
	if (error)
		goto out;

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

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

1831 1832
	ap.target = gfs2_get_inode_blocks(&ip->i_inode);

1833 1834
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1835
		error = gfs2_quota_check(ip, nuid, ngid, &ap);
D
David Teigland 已提交
1836 1837 1838 1839 1840 1841 1842 1843
		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
1844
	error = gfs2_setattr_simple(inode, attr);
D
David Teigland 已提交
1845 1846 1847
	if (error)
		goto out_end_trans;

1848 1849
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1850
		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1851
		gfs2_quota_change(ip, ap.target, nuid, ngid);
D
David Teigland 已提交
1852 1853
	}

1854
out_end_trans:
D
David Teigland 已提交
1855
	gfs2_trans_end(sdp);
1856
out_gunlock_q:
D
David Teigland 已提交
1857
	gfs2_quota_unlock(ip);
1858
out:
D
David Teigland 已提交
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
	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)
{
1875
	struct inode *inode = d_inode(dentry);
1876
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1877 1878 1879
	struct gfs2_holder i_gh;
	int error;

1880
	error = gfs2_rsqa_alloc(ip);
1881 1882 1883
	if (error)
		return error;

D
David Teigland 已提交
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896
	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
1897
		error = gfs2_setattr_size(inode, attr->ia_size);
D
David Teigland 已提交
1898 1899
	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
		error = setattr_chown(inode, attr);
1900
	else {
S
Steven Whitehouse 已提交
1901
		error = gfs2_setattr_simple(inode, attr);
1902 1903 1904
		if (!error && attr->ia_valid & ATTR_MODE)
			error = posix_acl_chmod(inode, inode->i_mode);
	}
D
David Teigland 已提交
1905

1906
out:
D
David Teigland 已提交
1907 1908
	if (!error)
		mark_inode_dirty(inode);
S
Steven Whitehouse 已提交
1909
	gfs2_glock_dq_uninit(&i_gh);
D
David Teigland 已提交
1910 1911 1912 1913 1914
	return error;
}

/**
 * gfs2_getattr - Read out an inode's attributes
1915
 * @mnt: The vfsmount the inode is being accessed from
D
David Teigland 已提交
1916 1917 1918
 * @dentry: The dentry to stat
 * @stat: The inode's stats
 *
1919 1920 1921 1922 1923 1924
 * 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
1925 1926 1927 1928 1929 1930
 * Returns: errno
 */

static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
			struct kstat *stat)
{
1931
	struct inode *inode = d_inode(dentry);
1932
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1933 1934
	struct gfs2_holder gh;
	int error;
1935
	int unlock = 0;
D
David Teigland 已提交
1936

1937
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1938 1939 1940 1941
		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
1942 1943
	}

1944
	generic_fillattr(inode, stat);
1945
	if (unlock)
1946 1947 1948
		gfs2_glock_dq_uninit(&gh);

	return 0;
D
David Teigland 已提交
1949 1950 1951 1952 1953
}

static int gfs2_setxattr(struct dentry *dentry, const char *name,
			 const void *data, size_t size, int flags)
{
1954
	struct inode *inode = d_inode(dentry);
1955 1956 1957
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
1958

1959 1960 1961
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
1962
		ret = gfs2_rsqa_alloc(ip);
1963 1964
		if (ret == 0)
			ret = generic_setxattr(dentry, name, data, size, flags);
1965 1966 1967 1968
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
1969 1970
}

1971 1972
static ssize_t gfs2_getxattr(struct dentry *dentry, struct inode *inode,
			     const char *name, void *data, size_t size)
D
David Teigland 已提交
1973
{
1974 1975 1976
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
1977

1978 1979
	/* For selinux during lookup */
	if (gfs2_glock_is_locked_by_me(ip->i_gl))
1980
		return generic_getxattr(dentry, inode, name, data, size);
1981

1982 1983 1984
	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
1985
		ret = generic_getxattr(dentry, inode, name, data, size);
1986 1987 1988 1989
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
1990 1991 1992 1993
}

static int gfs2_removexattr(struct dentry *dentry, const char *name)
{
1994
	struct inode *inode = d_inode(dentry);
1995 1996 1997
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
1998

1999 2000 2001
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
2002
		ret = gfs2_rsqa_alloc(ip);
2003 2004
		if (ret == 0)
			ret = generic_removexattr(dentry, name);
2005 2006 2007 2008
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2009 2010
}

2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
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;

A
Al Viro 已提交
2022
	inode_lock(inode);
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048

	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:
A
Al Viro 已提交
2049
	inode_unlock(inode);
2050 2051 2052
	return ret;
}

2053
const struct inode_operations gfs2_file_iops = {
2054
	.permission = gfs2_permission,
D
David Teigland 已提交
2055 2056 2057 2058 2059 2060
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2061
	.fiemap = gfs2_fiemap,
2062
	.get_acl = gfs2_get_acl,
2063
	.set_acl = gfs2_set_acl,
D
David Teigland 已提交
2064 2065
};

2066
const struct inode_operations gfs2_dir_iops = {
D
David Teigland 已提交
2067 2068 2069 2070 2071 2072
	.create = gfs2_create,
	.lookup = gfs2_lookup,
	.link = gfs2_link,
	.unlink = gfs2_unlink,
	.symlink = gfs2_symlink,
	.mkdir = gfs2_mkdir,
2073
	.rmdir = gfs2_unlink,
D
David Teigland 已提交
2074
	.mknod = gfs2_mknod,
2075
	.rename2 = gfs2_rename2,
2076
	.permission = gfs2_permission,
D
David Teigland 已提交
2077 2078 2079 2080 2081 2082
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2083
	.fiemap = gfs2_fiemap,
2084
	.get_acl = gfs2_get_acl,
2085
	.set_acl = gfs2_set_acl,
2086
	.atomic_open = gfs2_atomic_open,
D
David Teigland 已提交
2087 2088
};

2089
const struct inode_operations gfs2_symlink_iops = {
A
Al Viro 已提交
2090
	.readlink = generic_readlink,
2091
	.get_link = gfs2_get_link,
2092
	.permission = gfs2_permission,
D
David Teigland 已提交
2093 2094 2095 2096 2097 2098
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2099
	.fiemap = gfs2_fiemap,
D
David Teigland 已提交
2100 2101
};