[GFS2] The core of GFS2

This patch contains all the core files for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 1805 insertions, 0 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
new file mode 100644
index 000000000000..73922dba5398
--- /dev/null
+++ b/fs/gfs2/inode.c
@@ -0,0 +1,1805 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/posix_acl.h>
+#include <linux/sort.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "acl.h"
+#include "bmap.h"
+#include "dir.h"
+#include "eattr.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "ops_address.h"
+#include "ops_file.h"
+#include "ops_inode.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "unlinked.h"
+
+/**
+ * inode_attr_in - Copy attributes from the dinode into the VFS inode
+ * @ip: The GFS2 inode (with embedded disk inode data)
+ * @inode:  The Linux VFS inode
+ *
+ */
+
+static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode)
+{
+	inode->i_ino = ip->i_num.no_formal_ino;
+
+	switch (ip->i_di.di_mode & S_IFMT) {
+	case S_IFBLK:
+	case S_IFCHR:
+		inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
+		break;
+	default:
+		inode->i_rdev = 0;
+		break;
+	};
+
+	inode->i_mode = ip->i_di.di_mode;
+	inode->i_nlink = ip->i_di.di_nlink;
+	inode->i_uid = ip->i_di.di_uid;
+	inode->i_gid = ip->i_di.di_gid;
+	i_size_write(inode, ip->i_di.di_size);
+	inode->i_atime.tv_sec = ip->i_di.di_atime;
+	inode->i_mtime.tv_sec = ip->i_di.di_mtime;
+	inode->i_ctime.tv_sec = ip->i_di.di_ctime;
+	inode->i_atime.tv_nsec = 0;
+	inode->i_mtime.tv_nsec = 0;
+	inode->i_ctime.tv_nsec = 0;
+	inode->i_blksize = PAGE_SIZE;
+	inode->i_blocks = ip->i_di.di_blocks <<
+		(ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
+
+	if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
+		inode->i_flags |= S_IMMUTABLE;
+	else
+		inode->i_flags &= ~S_IMMUTABLE;
+
+	if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
+		inode->i_flags |= S_APPEND;
+	else
+		inode->i_flags &= ~S_APPEND;
+}
+
+/**
+ * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
+ * @ip: The GFS2 inode (with embedded disk inode data)
+ *
+ */
+
+void gfs2_inode_attr_in(struct gfs2_inode *ip)
+{
+	struct inode *inode;
+
+	inode = gfs2_ip2v_lookup(ip);
+	if (inode) {
+		inode_attr_in(ip, inode);
+		iput(inode);
+	}
+}
+
+/**
+ * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
+ * @ip: The GFS2 inode
+ *
+ * Only copy out the attributes that we want the VFS layer
+ * to be able to modify.
+ */
+
+void gfs2_inode_attr_out(struct gfs2_inode *ip)
+{
+	struct inode *inode = ip->i_vnode;
+
+	gfs2_assert_withdraw(ip->i_sbd,
+		(ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
+	ip->i_di.di_mode = inode->i_mode;
+	ip->i_di.di_uid = inode->i_uid;
+	ip->i_di.di_gid = inode->i_gid;
+	ip->i_di.di_atime = inode->i_atime.tv_sec;
+	ip->i_di.di_mtime = inode->i_mtime.tv_sec;
+	ip->i_di.di_ctime = inode->i_ctime.tv_sec;
+}
+
+/**
+ * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode
+ * @ip: the struct gfs2_inode to get the struct inode for
+ *
+ * Returns: A VFS inode, or NULL if none
+ */
+
+struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip)
+{
+	struct inode *inode = NULL;
+
+	gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags));
+
+	spin_lock(&ip->i_spin);
+	if (ip->i_vnode)
+		inode = igrab(ip->i_vnode);
+	spin_unlock(&ip->i_spin);
+
+	return inode;
+}
+
+/**
+ * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode
+ * @ip: the struct gfs2_inode to get the struct inode for
+ *
+ * Returns: A VFS inode, or NULL if no mem
+ */
+
+struct inode *gfs2_ip2v(struct gfs2_inode *ip)
+{
+	struct inode *inode, *tmp;
+
+	inode = gfs2_ip2v_lookup(ip);
+	if (inode)
+		return inode;
+
+	tmp = new_inode(ip->i_sbd->sd_vfs);
+	if (!tmp)
+		return NULL;
+
+	inode_attr_in(ip, tmp);
+
+	if (S_ISREG(ip->i_di.di_mode)) {
+		tmp->i_op = &gfs2_file_iops;
+		tmp->i_fop = &gfs2_file_fops;
+		tmp->i_mapping->a_ops = &gfs2_file_aops;
+	} else if (S_ISDIR(ip->i_di.di_mode)) {
+		tmp->i_op = &gfs2_dir_iops;
+		tmp->i_fop = &gfs2_dir_fops;
+	} else if (S_ISLNK(ip->i_di.di_mode)) {
+		tmp->i_op = &gfs2_symlink_iops;
+	} else {
+		tmp->i_op = &gfs2_dev_iops;
+		init_special_inode(tmp, tmp->i_mode, tmp->i_rdev);
+	}
+
+	set_v2ip(tmp, NULL);
+
+	for (;;) {
+		spin_lock(&ip->i_spin);
+		if (!ip->i_vnode)
+			break;
+		inode = igrab(ip->i_vnode);
+		spin_unlock(&ip->i_spin);
+
+		if (inode) {
+			iput(tmp);
+			return inode;
+		}
+		yield();
+	}
+
+	inode = tmp;
+
+	gfs2_inode_hold(ip);
+	ip->i_vnode = inode;
+	set_v2ip(inode, ip);
+
+	spin_unlock(&ip->i_spin);
+
+	insert_inode_hash(inode);
+
+	return inode;
+}
+
+static int iget_test(struct inode *inode, void *opaque)
+{
+	struct gfs2_inode *ip = get_v2ip(inode);
+	struct gfs2_inum *inum = (struct gfs2_inum *)opaque;
+
+	if (ip && ip->i_num.no_addr == inum->no_addr)
+		return 1;
+
+	return 0;
+}
+
+struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
+{
+	return ilookup5(sb, (unsigned long)inum->no_formal_ino,
+			iget_test, inum);
+}
+
+void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type)
+{
+	spin_lock(&ip->i_spin);
+	if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) {
+		ip->i_di.di_nlink = 1;
+		ip->i_di.di_mode = DT2IF(type);
+	}
+	spin_unlock(&ip->i_spin);
+}
+
+/**
+ * gfs2_inode_refresh - Refresh the incore copy of the dinode
+ * @ip: The GFS2 inode
+ *
+ * Returns: errno
+ */
+
+int gfs2_inode_refresh(struct gfs2_inode *ip)
+{
+	struct buffer_head *dibh;
+	int error;
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		return error;
+
+	if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) {
+		brelse(dibh);
+		return -EIO;
+	}
+
+	spin_lock(&ip->i_spin);
+	gfs2_dinode_in(&ip->i_di, dibh->b_data);
+	set_bit(GIF_MIN_INIT, &ip->i_flags);
+	spin_unlock(&ip->i_spin);
+
+	brelse(dibh);
+
+	if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
+		if (gfs2_consist_inode(ip))
+			gfs2_dinode_print(&ip->i_di);
+		return -EIO;
+	}
+	if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
+		return -ESTALE;
+
+	ip->i_vn = ip->i_gl->gl_vn;
+
+	return 0;
+}
+
+/**
+ * inode_create - create a struct gfs2_inode
+ * @i_gl: The glock covering the inode
+ * @inum: The inode number
+ * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode)
+ * @io_state: the state the iopen glock should be acquired in
+ * @ipp: pointer to put the returned inode in
+ *
+ * Returns: errno
+ */
+
+static int inode_create(struct gfs2_glock *i_gl, struct gfs2_inum *inum,
+			struct gfs2_glock *io_gl, unsigned int io_state,
+			struct gfs2_inode **ipp)
+{
+	struct gfs2_sbd *sdp = i_gl->gl_sbd;
+	struct gfs2_inode *ip;
+	int error = 0;
+
+	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
+	if (!ip)
+		return -ENOMEM;
+	memset(ip, 0, sizeof(struct gfs2_inode));
+
+	ip->i_num = *inum;
+
+	atomic_set(&ip->i_count, 1);
+
+	ip->i_vn = i_gl->gl_vn - 1;
+
+	ip->i_gl = i_gl;
+	ip->i_sbd = sdp;
+
+	spin_lock_init(&ip->i_spin);
+	init_rwsem(&ip->i_rw_mutex);
+
+	ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
+
+	error = gfs2_glock_nq_init(io_gl,
+				   io_state, GL_LOCAL_EXCL | GL_EXACT,
+				   &ip->i_iopen_gh);
+	if (error)
+		goto fail;
+	ip->i_iopen_gh.gh_owner = NULL;
+
+	spin_lock(&io_gl->gl_spin);
+	gfs2_glock_hold(i_gl);
+	set_gl2gl(io_gl, i_gl);
+	spin_unlock(&io_gl->gl_spin);
+
+	gfs2_glock_hold(i_gl);
+	set_gl2ip(i_gl, ip);
+
+	atomic_inc(&sdp->sd_inode_count);
+
+	*ipp = ip;
+
+	return 0;
+
+ fail:
+	gfs2_meta_cache_flush(ip);
+	kmem_cache_free(gfs2_inode_cachep, ip);
+	*ipp = NULL;
+
+	return error;
+}
+
+/**
+ * gfs2_inode_get - Create or get a reference on an inode
+ * @i_gl: The glock covering the inode
+ * @inum: The inode number
+ * @create:
+ * @ipp: pointer to put the returned inode in
+ *
+ * Returns: errno
+ */
+
+int gfs2_inode_get(struct gfs2_glock *i_gl, struct gfs2_inum *inum, int create,
+		   struct gfs2_inode **ipp)
+{
+	struct gfs2_sbd *sdp = i_gl->gl_sbd;
+	struct gfs2_glock *io_gl;
+	int error = 0;
+
+	gfs2_glmutex_lock(i_gl);
+
+	*ipp = get_gl2ip(i_gl);
+	if (*ipp) {
+		error = -ESTALE;
+		if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino)
+			goto out;
+		atomic_inc(&(*ipp)->i_count);
+		error = 0;
+		goto out;
+	}
+
+	if (!create)
+		goto out;
+
+	error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops,
+			       CREATE, &io_gl);
+	if (!error) {
+		error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp);
+		gfs2_glock_put(io_gl);
+	}
+
+ out:
+	gfs2_glmutex_unlock(i_gl);
+
+	return error;
+}
+
+void gfs2_inode_hold(struct gfs2_inode *ip)
+{
+	gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
+	atomic_inc(&ip->i_count);
+}
+
+void gfs2_inode_put(struct gfs2_inode *ip)
+{
+	gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
+	atomic_dec(&ip->i_count);
+}
+
+void gfs2_inode_destroy(struct gfs2_inode *ip)
+{
+	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl;
+	struct gfs2_glock *i_gl = ip->i_gl;
+
+	gfs2_assert_warn(sdp, !atomic_read(&ip->i_count));
+	gfs2_assert(sdp, get_gl2gl(io_gl) == i_gl);
+
+	spin_lock(&io_gl->gl_spin);
+	set_gl2gl(io_gl, NULL);
+	gfs2_glock_put(i_gl);
+	spin_unlock(&io_gl->gl_spin);
+
+	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+
+	gfs2_meta_cache_flush(ip);
+	kmem_cache_free(gfs2_inode_cachep, ip);
+
+	set_gl2ip(i_gl, NULL);
+	gfs2_glock_put(i_gl);
+
+	atomic_dec(&sdp->sd_inode_count);
+}
+
+static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_alloc *al;
+	struct gfs2_rgrpd *rgd;
+	int error;
+
+	if (ip->i_di.di_blocks != 1) {
+		if (gfs2_consist_inode(ip))
+			gfs2_dinode_print(&ip->i_di);
+		return -EIO;
+	}
+
+	al = gfs2_alloc_get(ip);
+
+	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+	if (error)
+		goto out;
+
+	error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
+	if (error)
+		goto out_qs;
+
+	rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
+	if (!rgd) {
+		gfs2_consist_inode(ip);
+		error = -EIO;
+		goto out_rindex_relse;
+	}
+
+	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
+				   &al->al_rgd_gh);
+	if (error)
+		goto out_rindex_relse;
+
+	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
+				 RES_STATFS + RES_QUOTA, 1);
+	if (error)
+		goto out_rg_gunlock;
+
+	gfs2_trans_add_gl(ip->i_gl);
+
+	gfs2_free_di(rgd, ip);
+
+	error = gfs2_unlinked_ondisk_rm(sdp, ul);
+
+	gfs2_trans_end(sdp);
+	clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+
+ out_rg_gunlock:
+	gfs2_glock_dq_uninit(&al->al_rgd_gh);
+
+ out_rindex_relse:
+	gfs2_glock_dq_uninit(&al->al_ri_gh);
+
+ out_qs:
+	gfs2_quota_unhold(ip);
+
+ out:
+	gfs2_alloc_put(ip);
+
+	return error;
+}
+
+/**
+ * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode)
+ * @sdp: the filesystem
+ * @inum: the inode number to deallocate
+ * @io_gh: a holder for the iopen glock for this inode
+ *
+ * Returns: errno
+ */
+
+static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul,
+			 struct gfs2_holder *io_gh)
+{
+	struct gfs2_inode *ip;
+	struct gfs2_holder i_gh;
+	int error;
+
+	error = gfs2_glock_nq_num(sdp,
+				  ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops,
+				  LM_ST_EXCLUSIVE, 0, &i_gh);
+	if (error)
+		return error;
+
+	/* We reacquire the iopen lock here to avoid a race with the NFS server
+	   calling gfs2_read_inode() with the inode number of a inode we're in
+	   the process of deallocating.  And we can't keep our hold on the lock
+	   from inode_dealloc_init() for deadlock reasons. */
+
+	gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh);
+	error = gfs2_glock_nq(io_gh);
+	switch (error) {
+	case 0:
+		break;
+	case GLR_TRYFAILED:
+		error = 1;
+	default:
+		goto out;
+	}
+
+	gfs2_assert_warn(sdp, !get_gl2ip(i_gh.gh_gl));
+	error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl,
+			     LM_ST_EXCLUSIVE, &ip);
+
+	gfs2_glock_dq(io_gh);
+
+	if (error)
+		goto out;
+
+	error = gfs2_inode_refresh(ip);
+	if (error)
+		goto out_iput;
+
+	if (ip->i_di.di_nlink) {
+		if (gfs2_consist_inode(ip))
+			gfs2_dinode_print(&ip->i_di);
+		error = -EIO;
+		goto out_iput;
+	}
+
+	if (S_ISDIR(ip->i_di.di_mode) &&
+	    (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
+		error = gfs2_dir_exhash_dealloc(ip);
+		if (error)
+			goto out_iput;
+	}
+
+	if (ip->i_di.di_eattr) {
+		error = gfs2_ea_dealloc(ip);
+		if (error)
+			goto out_iput;
+	}
+
+	if (!gfs2_is_stuffed(ip)) {
+		error = gfs2_file_dealloc(ip);
+		if (error)
+			goto out_iput;
+	}
+
+	error = dinode_dealloc(ip, ul);
+	if (error)
+		goto out_iput;
+
+ out_iput:
+	gfs2_glmutex_lock(i_gh.gh_gl);
+	gfs2_inode_put(ip);
+	gfs2_inode_destroy(ip);
+	gfs2_glmutex_unlock(i_gh.gh_gl);
+
+ out:
+	gfs2_glock_dq_uninit(&i_gh);
+
+	return error;
+}
+
+/**
+ * try_inode_dealloc - Try to deallocate an inode and all its blocks
+ * @sdp: the filesystem
+ *
+ * Returns: 0 on success, -errno on error, 1 on busy (inode open)
+ */
+
+static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+	struct gfs2_holder io_gh;
+	int error = 0;
+
+	gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum);
+
+	error = gfs2_glock_nq_num(sdp,
+				  ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops,
+				  LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh);
+	switch (error) {
+	case 0:
+		break;
+	case GLR_TRYFAILED:
+		return 1;
+	default:
+		return error;
+	}
+
+	gfs2_glock_dq(&io_gh);
+	error = inode_dealloc(sdp, ul, &io_gh);
+	gfs2_holder_uninit(&io_gh);
+
+	return error;
+}
+
+static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+	struct gfs2_rgrpd *rgd;
+	struct gfs2_holder ri_gh, rgd_gh;
+	int error;
+
+	error = gfs2_rindex_hold(sdp, &ri_gh);
+	if (error)
+		return error;
+
+	rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr);
+	if (!rgd) {
+		gfs2_consist(sdp);
+		error = -EIO;
+		goto out;
+	}
+
+	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh);
+	if (error)
+		goto out;
+
+	error = gfs2_trans_begin(sdp,
+				 RES_RG_BIT + RES_UNLINKED + RES_STATFS,
+				 0);
+	if (error)
+		goto out_gunlock;
+
+	gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr);
+	gfs2_unlinked_ondisk_rm(sdp, ul);
+
+	gfs2_trans_end(sdp);
+
+ out_gunlock:
+	gfs2_glock_dq_uninit(&rgd_gh);
+ out:
+	gfs2_glock_dq_uninit(&ri_gh);
+
+	return error;
+}
+
+int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+	if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT)
+		return inode_dealloc_uninit(sdp, ul);
+	else
+		return try_inode_dealloc(sdp, ul);
+}
+
+/**
+ * gfs2_change_nlink - Change nlink count on inode
+ * @ip: The GFS2 inode
+ * @diff: The change in the nlink count required
+ *
+ * Returns: errno
+ */
+
+int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
+{
+	struct buffer_head *dibh;
+	uint32_t nlink;
+	int error;
+
+	nlink = ip->i_di.di_nlink + diff;
+
+	/* If we are reducing the nlink count, but the new value ends up being
+	   bigger than the old one, we must have underflowed. */
+	if (diff < 0 && nlink > ip->i_di.di_nlink) {
+		if (gfs2_consist_inode(ip))
+			gfs2_dinode_print(&ip->i_di);
+		return -EIO;
+	}
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		return error;
+
+	ip->i_di.di_nlink = nlink;
+	ip->i_di.di_ctime = get_seconds();
+
+	gfs2_trans_add_bh(ip->i_gl, dibh);
+	gfs2_dinode_out(&ip->i_di, dibh->b_data);
+	brelse(dibh);
+
+	return 0;
+}
+
+/**
+ * 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
+ *
+ * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
+ * @is_root is true.
+ *
+ * Returns: errno
+ */
+
+int gfs2_lookupi(struct gfs2_inode *dip, struct qstr *name, int is_root,
+		 struct gfs2_inode **ipp)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	struct gfs2_holder d_gh;
+	struct gfs2_inum inum;
+	unsigned int type;
+	struct gfs2_glock *gl;
+	int error;
+
+	if (!name->len || name->len > GFS2_FNAMESIZE)
+		return -ENAMETOOLONG;
+
+	if (gfs2_filecmp(name, ".", 1) ||
+	    (gfs2_filecmp(name, "..", 2) && dip == sdp->sd_root_dir)) {
+		gfs2_inode_hold(dip);
+		*ipp = dip;
+		return 0;
+	}
+
+	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+	if (error)
+		return error;
+
+	if (!is_root) {
+		error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL);
+		if (error)
+			goto out;
+	}
+
+	error = gfs2_dir_search(dip, name, &inum, &type);
+	if (error)
+		goto out;
+
+	error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops,
+			       CREATE, &gl);
+	if (error)
+		goto out;
+
+	error = gfs2_inode_get(gl, &inum, CREATE, ipp);
+	if (!error)
+		gfs2_inode_min_init(*ipp, type);
+
+	gfs2_glock_put(gl);
+
+ out:
+	gfs2_glock_dq_uninit(&d_gh);
+
+	return error;
+}
+
+static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
+{
+	struct gfs2_inode *ip = sdp->sd_ir_inode;
+	struct buffer_head *bh;
+	struct gfs2_inum_range ir;
+	int error;
+
+	error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+	if (error)
+		return error;
+	down(&sdp->sd_inum_mutex);
+
+	error = gfs2_meta_inode_buffer(ip, &bh);
+	if (error) {
+		up(&sdp->sd_inum_mutex);
+		gfs2_trans_end(sdp);
+		return error;
+	}
+
+	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+	if (ir.ir_length) {
+		*formal_ino = ir.ir_start++;
+		ir.ir_length--;
+		gfs2_trans_add_bh(ip->i_gl, bh);
+		gfs2_inum_range_out(&ir,
+				    bh->b_data + sizeof(struct gfs2_dinode));
+		brelse(bh);
+		up(&sdp->sd_inum_mutex);
+		gfs2_trans_end(sdp);
+		return 0;
+	}
+
+	brelse(bh);
+
+	up(&sdp->sd_inum_mutex);
+	gfs2_trans_end(sdp);
+
+	return 1;
+}
+
+static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
+{
+	struct gfs2_inode *ip = sdp->sd_ir_inode;
+	struct gfs2_inode *m_ip = sdp->sd_inum_inode;
+	struct gfs2_holder gh;
+	struct buffer_head *bh;
+	struct gfs2_inum_range ir;
+	int error;
+
+	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+	if (error)
+		return error;
+
+	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
+	if (error)
+		goto out;
+	down(&sdp->sd_inum_mutex);
+
+	error = gfs2_meta_inode_buffer(ip, &bh);
+	if (error)
+		goto out_end_trans;
+	
+	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+	if (!ir.ir_length) {
+		struct buffer_head *m_bh;
+		uint64_t x, y;
+
+		error = gfs2_meta_inode_buffer(m_ip, &m_bh);
+		if (error)
+			goto out_brelse;
+
+		x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
+		x = y = be64_to_cpu(x);
+		ir.ir_start = x;
+		ir.ir_length = GFS2_INUM_QUANTUM;
+		x += GFS2_INUM_QUANTUM;
+		if (x < y)
+			gfs2_consist_inode(m_ip);
+		x = cpu_to_be64(x);
+		gfs2_trans_add_bh(m_ip->i_gl, m_bh);
+		*(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
+
+		brelse(m_bh);
+	}
+
+	*formal_ino = ir.ir_start++;
+	ir.ir_length--;
+
+	gfs2_trans_add_bh(ip->i_gl, bh);
+	gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ out_brelse:
+	brelse(bh);
+
+ out_end_trans:
+	up(&sdp->sd_inum_mutex);
+	gfs2_trans_end(sdp);
+
+ out:
+	gfs2_glock_dq_uninit(&gh);
+
+	return error;
+}
+
+static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
+{
+	int error;
+
+	error = pick_formal_ino_1(sdp, inum);
+	if (error <= 0)
+		return error;
+
+	error = pick_formal_ino_2(sdp, inum);
+
+	return 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, struct qstr *name,
+		     unsigned int mode)
+{
+	int error;
+
+	error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
+	if (error)
+		return error;
+
+	/*  Don't create entries in an unlinked directory  */
+	if (!dip->i_di.di_nlink)
+		return -EPERM;
+
+	error = gfs2_dir_search(dip, name, NULL, NULL);
+	switch (error) {
+	case -ENOENT:
+		error = 0;
+		break;
+	case 0:
+		return -EEXIST;
+	default:
+		return error;
+	}
+
+	if (dip->i_di.di_entries == (uint32_t)-1)
+		return -EFBIG;
+	if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
+		return -EMLINK;
+
+	return 0;
+}
+
+static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
+			       unsigned int *uid, unsigned int *gid)
+{
+	if (dip->i_sbd->sd_args.ar_suiddir &&
+	    (dip->i_di.di_mode & S_ISUID) &&
+	    dip->i_di.di_uid) {
+		if (S_ISDIR(*mode))
+			*mode |= S_ISUID;
+		else if (dip->i_di.di_uid != current->fsuid)
+			*mode &= ~07111;
+		*uid = dip->i_di.di_uid;
+	} else
+		*uid = current->fsuid;
+
+	if (dip->i_di.di_mode & S_ISGID) {
+		if (S_ISDIR(*mode))
+			*mode |= S_ISGID;
+		*gid = dip->i_di.di_gid;
+	} else
+		*gid = current->fsgid;
+}
+
+static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	int error;
+
+	gfs2_alloc_get(dip);
+
+	dip->i_alloc.al_requested = RES_DINODE;
+	error = gfs2_inplace_reserve(dip);
+	if (error)
+		goto out;
+
+	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
+				 RES_STATFS, 0);
+	if (error)
+		goto out_ipreserv;
+
+	ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip);
+
+	ul->ul_ut.ut_flags = GFS2_UTF_UNINIT;
+	error = gfs2_unlinked_ondisk_add(sdp, ul);
+
+	gfs2_trans_end(sdp);
+
+ out_ipreserv:
+	gfs2_inplace_release(dip);
+
+ out:
+	gfs2_alloc_put(dip);
+
+	return error;
+}
+
+/**
+ * init_dinode - Fill in a new dinode structure
+ * @dip: the directory this inode is being created in
+ * @gl: The glock covering the new inode
+ * @inum: the inode number
+ * @mode: the file permissions
+ * @uid:
+ * @gid:
+ *
+ */
+
+static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
+			struct gfs2_inum *inum, unsigned int mode,
+			unsigned int uid, unsigned int gid)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	struct gfs2_dinode di;
+	struct buffer_head *dibh;
+
+	dibh = gfs2_meta_new(gl, inum->no_addr);
+	gfs2_trans_add_bh(gl, dibh);
+	gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
+	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+
+	memset(&di, 0, sizeof(struct gfs2_dinode));
+	gfs2_meta_header_in(&di.di_header, dibh->b_data);
+	di.di_num = *inum;
+	di.di_mode = mode;
+	di.di_uid = uid;
+	di.di_gid = gid;
+	di.di_blocks = 1;
+	di.di_atime = di.di_mtime = di.di_ctime = get_seconds();
+	di.di_goal_meta = di.di_goal_data = inum->no_addr;
+
+	if (S_ISREG(mode)) {
+		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
+		    gfs2_tune_get(sdp, gt_new_files_jdata))
+			di.di_flags |= GFS2_DIF_JDATA;
+		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
+		    gfs2_tune_get(sdp, gt_new_files_directio))
+			di.di_flags |= GFS2_DIF_DIRECTIO;
+	} else if (S_ISDIR(mode)) {
+		di.di_flags |= (dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO);
+		di.di_flags |= (dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA);
+	}
+
+	gfs2_dinode_out(&di, dibh->b_data);
+	brelse(dibh);
+}
+
+static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
+		       unsigned int mode, struct gfs2_unlinked *ul)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	unsigned int uid, gid;
+	int error;
+
+	munge_mode_uid_gid(dip, &mode, &uid, &gid);
+
+	gfs2_alloc_get(dip);
+
+	error = gfs2_quota_lock(dip, uid, gid);
+	if (error)
+		goto out;
+
+	error = gfs2_quota_check(dip, uid, gid);
+	if (error)
+		goto out_quota;
+
+	error = gfs2_trans_begin(sdp, RES_DINODE + RES_UNLINKED +
+				 RES_QUOTA, 0);
+	if (error)
+		goto out_quota;
+
+	ul->ul_ut.ut_flags = 0;
+	error = gfs2_unlinked_ondisk_munge(sdp, ul);
+
+	init_dinode(dip, gl, &ul->ul_ut.ut_inum,
+		     mode, uid, gid);
+
+	gfs2_quota_change(dip, +1, uid, gid);
+
+	gfs2_trans_end(sdp);
+
+ out_quota:
+	gfs2_quota_unlock(dip);
+
+ out:
+	gfs2_alloc_put(dip);
+
+	return error;
+}
+
+static int link_dinode(struct gfs2_inode *dip, struct qstr *name,
+		       struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	struct gfs2_alloc *al;
+	int alloc_required;
+	struct buffer_head *dibh;
+	int error;
+
+	al = gfs2_alloc_get(dip);
+
+	error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+	if (error)
+		goto fail;
+
+	error = gfs2_diradd_alloc_required(dip, name, &alloc_required);
+	if (alloc_required) {
+		error = gfs2_quota_check(dip, dip->i_di.di_uid,
+					 dip->i_di.di_gid);
+		if (error)
+			goto fail_quota_locks;
+
+		al->al_requested = sdp->sd_max_dirres;
+
+		error = gfs2_inplace_reserve(dip);
+		if (error)
+			goto fail_quota_locks;
+
+		error = gfs2_trans_begin(sdp,
+					 sdp->sd_max_dirres +
+					 al->al_rgd->rd_ri.ri_length +
+					 2 * RES_DINODE + RES_UNLINKED +
+					 RES_STATFS + RES_QUOTA, 0);
+		if (error)
+			goto fail_ipreserv;
+	} else {
+		error = gfs2_trans_begin(sdp,
+					 RES_LEAF +
+					 2 * RES_DINODE +
+					 RES_UNLINKED, 0);
+		if (error)
+			goto fail_quota_locks;
+	}
+
+	error = gfs2_dir_add(dip, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
+	if (error)
+		goto fail_end_trans;
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto fail_end_trans;
+	ip->i_di.di_nlink = 1;
+	gfs2_trans_add_bh(ip->i_gl, dibh);
+	gfs2_dinode_out(&ip->i_di, dibh->b_data);
+	brelse(dibh);
+
+	error = gfs2_unlinked_ondisk_rm(sdp, ul);
+	if (error)
+		goto fail_end_trans;
+
+	return 0;
+
+ fail_end_trans:
+	gfs2_trans_end(sdp);
+
+ fail_ipreserv:
+	if (dip->i_alloc.al_rgd)
+		gfs2_inplace_release(dip);
+
+ fail_quota_locks:
+	gfs2_quota_unlock(dip);
+
+ fail:
+	gfs2_alloc_put(dip);
+
+	return error;
+}
+
+/**
+ * gfs2_createi - Create a new inode
+ * @ghs: An array of two holders
+ * @name: The name of the new file
+ * @mode: the permissions on the new inode
+ *
+ * @ghs[0] is an initialized holder for the directory
+ * @ghs[1] is the holder for the inode lock
+ *
+ * If the return value is 0, the glocks on both the directory and the new
+ * file are held.  A transaction has been started and an inplace reservation
+ * is held, as well.
+ *
+ * Returns: errno
+ */
+
+int gfs2_createi(struct gfs2_holder *ghs, struct qstr *name, unsigned int mode)
+{
+	struct gfs2_inode *dip = get_gl2ip(ghs->gh_gl);
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	struct gfs2_unlinked *ul;
+	struct gfs2_inode *ip;
+	int error;
+
+	if (!name->len || name->len > GFS2_FNAMESIZE)
+		return -ENAMETOOLONG;
+
+	error = gfs2_unlinked_get(sdp, &ul);
+	if (error)
+		return error;
+
+	gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
+	error = gfs2_glock_nq(ghs);
+	if (error)
+		goto fail;
+
+	error = create_ok(dip, name, mode);
+	if (error)
+		goto fail_gunlock;
+
+	error = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino);
+	if (error)
+		goto fail_gunlock;
+
+	error = alloc_dinode(dip, ul);
+	if (error)
+		goto fail_gunlock;
+
+	if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) {
+		gfs2_glock_dq(ghs);
+
+		error = gfs2_glock_nq_num(sdp,
+					  ul->ul_ut.ut_inum.no_addr,
+					  &gfs2_inode_glops,
+					  LM_ST_EXCLUSIVE, GL_SKIP,
+					  ghs + 1);
+		if (error) {
+			gfs2_unlinked_put(sdp, ul);
+			return error;
+		}
+
+		gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
+		error = gfs2_glock_nq(ghs);
+		if (error) {
+			gfs2_glock_dq_uninit(ghs + 1);
+			gfs2_unlinked_put(sdp, ul);
+			return error;
+		}
+
+		error = create_ok(dip, name, mode);
+		if (error)
+			goto fail_gunlock2;
+	} else {
+		error = gfs2_glock_nq_num(sdp,
+					  ul->ul_ut.ut_inum.no_addr,
+					  &gfs2_inode_glops,
+					  LM_ST_EXCLUSIVE, GL_SKIP,
+					  ghs + 1);
+		if (error)
+			goto fail_gunlock;
+	}
+
+	error = make_dinode(dip, ghs[1].gh_gl, mode, ul);
+	if (error)
+		goto fail_gunlock2;
+
+	error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip);
+	if (error)
+		goto fail_gunlock2;
+
+	error = gfs2_inode_refresh(ip);
+	if (error)
+		goto fail_iput;
+
+	error = gfs2_acl_create(dip, ip);
+	if (error)
+		goto fail_iput;
+
+	error = link_dinode(dip, name, ip, ul);
+	if (error)
+		goto fail_iput;
+
+	gfs2_unlinked_put(sdp, ul);
+
+	return 0;
+
+ fail_iput:
+	gfs2_inode_put(ip);
+
+ fail_gunlock2:
+	gfs2_glock_dq_uninit(ghs + 1);
+
+ fail_gunlock:
+	gfs2_glock_dq(ghs);
+
+ fail:
+	gfs2_unlinked_put(sdp, ul);
+
+	return error;
+}
+
+/**
+ * gfs2_unlinki - Unlink a file
+ * @dip: The inode of the directory
+ * @name: The name of the file to be unlinked
+ * @ip: The inode of the file to be removed
+ *
+ * Assumes Glocks on both dip and ip are held.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
+		 struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	int error;
+
+	error = gfs2_dir_del(dip, name);
+	if (error)
+		return error;
+
+	error = gfs2_change_nlink(ip, -1);
+	if (error)
+		return error;
+
+	/* If this inode is being unlinked from the directory structure,
+	   we need to mark that in the log so that it isn't lost during
+	   a crash. */
+
+	if (!ip->i_di.di_nlink) {
+		ul->ul_ut.ut_inum = ip->i_num;
+		error = gfs2_unlinked_ondisk_add(sdp, ul);
+		if (!error)
+			set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+	}
+
+	return error;
+}
+
+/**
+ * gfs2_rmdiri - Remove a directory
+ * @dip: The parent directory of the directory to be removed
+ * @name: The name of the directory to be removed
+ * @ip: The GFS2 inode of the directory to be removed
+ *
+ * Assumes Glocks on dip and ip are held
+ *
+ * Returns: errno
+ */
+
+int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name,
+		struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+	struct gfs2_sbd *sdp = dip->i_sbd;
+	struct qstr dotname;
+	int error;
+
+	if (ip->i_di.di_entries != 2) {
+		if (gfs2_consist_inode(ip))
+			gfs2_dinode_print(&ip->i_di);
+		return -EIO;
+	}
+
+	error = gfs2_dir_del(dip, name);
+	if (error)
+		return error;
+
+	error = gfs2_change_nlink(dip, -1);
+	if (error)
+		return error;
+
+	dotname.len = 1;
+	dotname.name = ".";
+	error = gfs2_dir_del(ip, &dotname);
+	if (error)
+		return error;
+
+	dotname.len = 2;
+	dotname.name = "..";
+	error = gfs2_dir_del(ip, &dotname);
+	if (error)
+		return error;
+
+	error = gfs2_change_nlink(ip, -2);
+	if (error)
+		return error;
+
+	/* This inode is being unlinked from the directory structure and
+	   we need to mark that in the log so that it isn't lost during
+	   a crash. */
+
+	ul->ul_ut.ut_inum = ip->i_num;
+	error = gfs2_unlinked_ondisk_add(sdp, ul);
+	if (!error)
+		set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+
+	return error;
+}
+
+/*
+ * 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
+ */
+
+int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name,
+		   struct gfs2_inode *ip)
+{
+	struct gfs2_inum inum;
+	unsigned int type;
+	int error;
+
+	if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
+		return -EPERM;
+
+	if ((dip->i_di.di_mode & S_ISVTX) &&
+	    dip->i_di.di_uid != current->fsuid &&
+	    ip->i_di.di_uid != current->fsuid &&
+	    !capable(CAP_FOWNER))
+		return -EPERM;
+
+	if (IS_APPEND(dip->i_vnode))
+		return -EPERM;
+
+	error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
+	if (error)
+		return error;
+
+	error = gfs2_dir_search(dip, name, &inum, &type);
+	if (error)
+		return error;
+
+	if (!gfs2_inum_equal(&inum, &ip->i_num))
+		return -ENOENT;
+
+	if (IF2DT(ip->i_di.di_mode) != type) {
+		gfs2_consist_inode(dip);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/*
+ * 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
+ */
+
+int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
+{
+	struct gfs2_sbd *sdp = this->i_sbd;
+	struct gfs2_inode *tmp;
+	struct qstr dotdot;
+	int error = 0;
+
+	memset(&dotdot, 0, sizeof(struct qstr));
+	dotdot.name = "..";
+	dotdot.len = 2;
+
+	gfs2_inode_hold(to);
+
+	for (;;) {
+		if (to == this) {
+			error = -EINVAL;
+			break;
+		}
+		if (to == sdp->sd_root_dir) {
+			error = 0;
+			break;
+		}
+
+		error = gfs2_lookupi(to, &dotdot, 1, &tmp);
+		if (error)
+			break;
+
+		gfs2_inode_put(to);
+		to = tmp;
+	}
+
+	gfs2_inode_put(to);
+
+	return error;
+}
+
+/**
+ * gfs2_readlinki - return the contents of a symlink
+ * @ip: the symlink's inode
+ * @buf: a pointer to the buffer to be filled
+ * @len: a pointer to the length of @buf
+ *
+ * If @buf is too small, a piece of memory is kmalloc()ed and needs
+ * to be freed by the caller.
+ *
+ * Returns: errno
+ */
+
+int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
+{
+	struct gfs2_holder i_gh;
+	struct buffer_head *dibh;
+	unsigned int x;
+	int error;
+
+	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
+	error = gfs2_glock_nq_atime(&i_gh);
+	if (error) {
+		gfs2_holder_uninit(&i_gh);
+		return error;
+	}
+
+	if (!ip->i_di.di_size) {
+		gfs2_consist_inode(ip);
+		error = -EIO;
+		goto out;
+	}
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto out;
+
+	x = ip->i_di.di_size + 1;
+	if (x > *len) {
+		*buf = kmalloc(x, GFP_KERNEL);
+		if (!*buf) {
+			error = -ENOMEM;
+			goto out_brelse;
+		}
+	}
+
+	memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
+	*len = x;
+
+ out_brelse:
+	brelse(dibh);
+
+ out:
+	gfs2_glock_dq_uninit(&i_gh);
+
+	return error;
+}
+
+/**
+ * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
+ *       conditionally update the inode's atime
+ * @gh: the holder to acquire
+ *
+ * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
+ * Update if the difference between the current time and the inode's current
+ * atime is greater than an interval specified at mount.
+ *
+ * Returns: errno
+ */
+
+int gfs2_glock_nq_atime(struct gfs2_holder *gh)
+{
+	struct gfs2_glock *gl = gh->gh_gl;
+	struct gfs2_sbd *sdp = gl->gl_sbd;
+	struct gfs2_inode *ip = get_gl2ip(gl);
+	int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
+	unsigned int state;
+	int flags;
+	int error;
+
+	if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
+	    gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
+	    gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
+		return -EINVAL;
+
+	state = gh->gh_state;
+	flags = gh->gh_flags;
+
+	error = gfs2_glock_nq(gh);
+	if (error)
+		return error;
+
+	if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
+	    (sdp->sd_vfs->s_flags & MS_RDONLY))
+		return 0;
+
+	curtime = get_seconds();
+	if (curtime - ip->i_di.di_atime >= quantum) {
+		gfs2_glock_dq(gh);
+		gfs2_holder_reinit(LM_ST_EXCLUSIVE,
+				  gh->gh_flags & ~LM_FLAG_ANY,
+				  gh);
+		error = gfs2_glock_nq(gh);
+		if (error)
+			return error;
+
+		/* Verify that atime hasn't been updated while we were
+		   trying to get exclusive lock. */
+
+		curtime = get_seconds();
+		if (curtime - ip->i_di.di_atime >= quantum) {
+			struct buffer_head *dibh;
+
+			error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+			if (error == -EROFS)
+				return 0;
+			if (error)
+				goto fail;
+
+			error = gfs2_meta_inode_buffer(ip, &dibh);
+			if (error)
+				goto fail_end_trans;
+
+			ip->i_di.di_atime = curtime;
+
+			gfs2_trans_add_bh(ip->i_gl, dibh);
+			gfs2_dinode_out(&ip->i_di, dibh->b_data);
+			brelse(dibh);
+
+			gfs2_trans_end(sdp);
+		}
+
+		/* If someone else has asked for the glock,
+		   unlock and let them have it. Then reacquire
+		   in the original state. */
+		if (gfs2_glock_is_blocking(gl)) {
+			gfs2_glock_dq(gh);
+			gfs2_holder_reinit(state, flags, gh);
+			return gfs2_glock_nq(gh);
+		}
+	}
+
+	return 0;
+
+ fail_end_trans:
+	gfs2_trans_end(sdp);
+
+ fail:
+	gfs2_glock_dq(gh);
+
+	return error;
+}
+
+/**
+ * glock_compare_atime - Compare two struct gfs2_glock structures for sort
+ * @arg_a: the first structure
+ * @arg_b: the second structure
+ *
+ * Returns: 1 if A > B
+ *         -1 if A < B
+ *          0 if A = B
+ */
+
+static int glock_compare_atime(const void *arg_a, const void *arg_b)
+{
+	struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
+	struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
+	struct lm_lockname *a = &gh_a->gh_gl->gl_name;
+	struct lm_lockname *b = &gh_b->gh_gl->gl_name;
+	int ret = 0;
+
+	if (a->ln_number > b->ln_number)
+		ret = 1;
+	else if (a->ln_number < b->ln_number)
+		ret = -1;
+	else {
+		if (gh_a->gh_state == LM_ST_SHARED &&
+		    gh_b->gh_state == LM_ST_EXCLUSIVE)
+			ret = 1;
+		else if (gh_a->gh_state == LM_ST_SHARED &&
+			 (gh_b->gh_flags & GL_ATIME))
+			ret = 1;
+	}
+
+	return ret;
+}
+
+/**
+ * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
+ *      atime update
+ * @num_gh: the number of structures
+ * @ghs: an array of struct gfs2_holder structures
+ *
+ * Returns: 0 on success (all glocks acquired),
+ *          errno on failure (no glocks acquired)
+ */
+
+int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
+{
+	struct gfs2_holder **p;
+	unsigned int x;
+	int error = 0;
+
+	if (!num_gh)
+		return 0;
+
+	if (num_gh == 1) {
+		ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
+		if (ghs->gh_flags & GL_ATIME)
+			error = gfs2_glock_nq_atime(ghs);
+		else
+			error = gfs2_glock_nq(ghs);
+		return error;
+	}
+
+	p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	for (x = 0; x < num_gh; x++)
+		p[x] = &ghs[x];
+
+	sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
+
+	for (x = 0; x < num_gh; x++) {
+		p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
+
+		if (p[x]->gh_flags & GL_ATIME)
+			error = gfs2_glock_nq_atime(p[x]);
+		else
+			error = gfs2_glock_nq(p[x]);
+
+		if (error) {
+			while (x--)
+				gfs2_glock_dq(p[x]);
+			break;
+		}
+	}
+
+	kfree(p);
+
+	return error;
+}
+
+/**
+ * gfs2_try_toss_vnode - See if we can toss a vnode from memory
+ * @ip: the inode
+ *
+ * Returns:  1 if the vnode was tossed
+ */
+
+void gfs2_try_toss_vnode(struct gfs2_inode *ip)
+{
+	struct inode *inode;
+
+	inode = gfs2_ip2v_lookup(ip);
+	if (!inode)
+		return;
+
+	d_prune_aliases(inode);
+
+	if (S_ISDIR(ip->i_di.di_mode)) {
+		struct list_head *head = &inode->i_dentry;
+		struct dentry *d = NULL;
+
+		spin_lock(&dcache_lock);
+		if (list_empty(head))
+			spin_unlock(&dcache_lock);
+		else {
+			d = list_entry(head->next, struct dentry, d_alias);
+			dget_locked(d);
+			spin_unlock(&dcache_lock);
+
+			if (have_submounts(d))
+				dput(d);
+			else {
+				shrink_dcache_parent(d);
+				dput(d);
+				d_prune_aliases(inode);
+			}
+		}
+	}
+
+	inode->i_nlink = 0;
+	iput(inode);
+}
+
+
+static int
+__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+	struct buffer_head *dibh;
+	int error;
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (!error) {
+		error = inode_setattr(ip->i_vnode, attr);
+		gfs2_assert_warn(ip->i_sbd, !error);
+		gfs2_inode_attr_out(ip);
+
+		gfs2_trans_add_bh(ip->i_gl, dibh);
+		gfs2_dinode_out(&ip->i_di, dibh->b_data);
+		brelse(dibh);
+	}
+	return error;
+}
+
+/**
+ * gfs2_setattr_simple -
+ * @ip:
+ * @attr:
+ *
+ * Called with a reference on the vnode.
+ *
+ * Returns: errno
+ */
+
+int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+	int error;
+
+	if (get_transaction)
+		return __gfs2_setattr_simple(ip, attr);
+
+	error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0);
+	if (error)
+		return error;
+
+	error = __gfs2_setattr_simple(ip, attr);
+
+	gfs2_trans_end(ip->i_sbd);
+
+	return error;
+}
+
+int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd)
+{
+	return permission(inode, mask, nd);
+}
+