GFS2: Rename ops_inode.c to inode.c

This is the final part of the ops_inode.c/inode.c reordering. We
are left with a single file called inode.c which now contains
all the inode operations, as expected.

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

1 files changed, 1990 insertions, 0 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
new file mode 100644
index 00000000000..a783a7a8c0c
--- /dev/null
+++ b/fs/gfs2/inode.c
@@ -0,0 +1,1990 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 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 version 2.
+ */
+
+#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>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+#include <linux/fiemap.h>
+#include <linux/security.h>
+#include <asm/uaccess.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "bmap.h"
+#include "dir.h"
+#include "xattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "util.h"
+#include "super.h"
+#include "glops.h"
+
+struct gfs2_skip_data {
+	u64 no_addr;
+	int skipped;
+	int non_block;
+};
+
+static int iget_test(struct inode *inode, void *opaque)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_skip_data *data = opaque;
+
+	if (ip->i_no_addr == data->no_addr) {
+		if (data->non_block &&
+		    inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
+			data->skipped = 1;
+			return 0;
+		}
+		return 1;
+	}
+	return 0;
+}
+
+static int iget_set(struct inode *inode, void *opaque)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_skip_data *data = opaque;
+
+	if (data->skipped)
+		return -ENOENT;
+	inode->i_ino = (unsigned long)(data->no_addr);
+	ip->i_no_addr = data->no_addr;
+	return 0;
+}
+
+struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
+{
+	unsigned long hash = (unsigned long)no_addr;
+	struct gfs2_skip_data data;
+
+	data.no_addr = no_addr;
+	data.skipped = 0;
+	data.non_block = non_block;
+	return ilookup5(sb, hash, iget_test, &data);
+}
+
+static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
+			       int non_block)
+{
+	struct gfs2_skip_data data;
+	unsigned long hash = (unsigned long)no_addr;
+
+	data.no_addr = no_addr;
+	data.skipped = 0;
+	data.non_block = non_block;
+	return iget5_locked(sb, hash, iget_test, iget_set, &data);
+}
+
+/**
+ * gfs2_set_iop - Sets inode operations
+ * @inode: The inode with correct i_mode filled in
+ *
+ * GFS2 lookup code fills in vfs inode contents based on info obtained
+ * from directory entry inside gfs2_inode_lookup().
+ */
+
+static void gfs2_set_iop(struct inode *inode)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	umode_t mode = inode->i_mode;
+
+	if (S_ISREG(mode)) {
+		inode->i_op = &gfs2_file_iops;
+		if (gfs2_localflocks(sdp))
+			inode->i_fop = &gfs2_file_fops_nolock;
+		else
+			inode->i_fop = &gfs2_file_fops;
+	} else if (S_ISDIR(mode)) {
+		inode->i_op = &gfs2_dir_iops;
+		if (gfs2_localflocks(sdp))
+			inode->i_fop = &gfs2_dir_fops_nolock;
+		else
+			inode->i_fop = &gfs2_dir_fops;
+	} else if (S_ISLNK(mode)) {
+		inode->i_op = &gfs2_symlink_iops;
+	} else {
+		inode->i_op = &gfs2_file_iops;
+		init_special_inode(inode, inode->i_mode, inode->i_rdev);
+	}
+}
+
+/**
+ * gfs2_inode_lookup - Lookup an inode
+ * @sb: The super block
+ * @no_addr: The inode number
+ * @type: The type of the inode
+ * non_block: Can we block on inodes that are being freed?
+ *
+ * Returns: A VFS inode, or an error
+ */
+
+struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
+				u64 no_addr, u64 no_formal_ino, int non_block)
+{
+	struct inode *inode;
+	struct gfs2_inode *ip;
+	struct gfs2_glock *io_gl = NULL;
+	int error;
+
+	inode = gfs2_iget(sb, no_addr, non_block);
+	ip = GFS2_I(inode);
+
+	if (!inode)
+		return ERR_PTR(-ENOBUFS);
+
+	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:
+	ip->i_iopen_gh.gh_gl->gl_object = NULL;
+	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+fail_iopen:
+	if (io_gl)
+		gfs2_glock_put(io_gl);
+fail_put:
+	ip->i_gl->gl_object = NULL;
+	gfs2_glock_put(ip->i_gl);
+fail:
+	iget_failed(inode);
+	return ERR_PTR(error);
+}
+
+struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
+				  u64 *no_formal_ino, unsigned int blktype)
+{
+	struct super_block *sb = sdp->sd_vfs;
+	struct gfs2_holder i_gh;
+	struct inode *inode = NULL;
+	int error;
+
+	/* Must not read in block until block type is verified */
+	error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
+				  LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
+	if (error)
+		return ERR_PTR(error);
+
+	error = gfs2_check_blk_type(sdp, no_addr, blktype);
+	if (error)
+		goto fail;
+
+	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
+	if (IS_ERR(inode))
+		goto fail;
+
+	/* Two extra checks for NFS only */
+	if (no_formal_ino) {
+		error = -ESTALE;
+		if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
+			goto fail_iput;
+
+		error = -EIO;
+		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
+			goto fail_iput;
+
+		error = 0;
+	}
+
+fail:
+	gfs2_glock_dq_uninit(&i_gh);
+	return error ? ERR_PTR(error) : inode;
+fail_iput:
+	iput(inode);
+	goto fail;
+}
+
+
+struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
+{
+	struct qstr qstr;
+	struct inode *inode;
+	gfs2_str2qstr(&qstr, name);
+	inode = gfs2_lookupi(dip, &qstr, 1);
+	/* gfs2_lookupi has inconsistent callers: vfs
+	 * related routines expect NULL for no entry found,
+	 * gfs2_lookup_simple callers expect ENOENT
+	 * and do not check for NULL.
+	 */
+	if (inode == NULL)
+		return ERR_PTR(-ENOENT);
+	else
+		return inode;
+}
+
+
+/**
+ * gfs2_lookupi - Look up a filename in a directory and return its inode
+ * @d_gh: An initialized holder for the directory glock
+ * @name: The name of the inode to look for
+ * @is_root: If 1, ignore the caller's permissions
+ * @i_gh: An uninitialized holder for the new inode glock
+ *
+ * This can be called via the VFS filldir function when NFS is doing
+ * a readdirplus and the inode which its intending to stat isn't
+ * already in cache. In this case we must not take the directory glock
+ * again, since the readdir call will have already taken that lock.
+ *
+ * Returns: errno
+ */
+
+struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
+			   int is_root)
+{
+	struct super_block *sb = dir->i_sb;
+	struct gfs2_inode *dip = GFS2_I(dir);
+	struct gfs2_holder d_gh;
+	int error = 0;
+	struct inode *inode = NULL;
+	int unlock = 0;
+
+	if (!name->len || name->len > GFS2_FNAMESIZE)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
+	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
+	     dir == sb->s_root->d_inode)) {
+		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) {
+		error = gfs2_permission(dir, MAY_EXEC, 0);
+		if (error)
+			goto out;
+	}
+
+	inode = gfs2_dir_search(dir, name);
+	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,
+		     unsigned int mode)
+{
+	int error;
+
+	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
+	if (error)
+		return error;
+
+	/*  Don't create entries in an unlinked directory  */
+	if (!dip->i_inode.i_nlink)
+		return -ENOENT;
+
+	error = gfs2_dir_check(&dip->i_inode, name, NULL);
+	switch (error) {
+	case -ENOENT:
+		error = 0;
+		break;
+	case 0:
+		return -EEXIST;
+	default:
+		return error;
+	}
+
+	if (dip->i_entries == (u32)-1)
+		return -EFBIG;
+	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-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 (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
+	    (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
+		if (S_ISDIR(*mode))
+			*mode |= S_ISUID;
+		else if (dip->i_inode.i_uid != current_fsuid())
+			*mode &= ~07111;
+		*uid = dip->i_inode.i_uid;
+	} else
+		*uid = current_fsuid();
+
+	if (dip->i_inode.i_mode & S_ISGID) {
+		if (S_ISDIR(*mode))
+			*mode |= S_ISGID;
+		*gid = dip->i_inode.i_gid;
+	} else
+		*gid = current_fsgid();
+}
+
+static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+	int error;
+
+	if (gfs2_alloc_get(dip) == NULL)
+		return -ENOMEM;
+
+	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_STATFS, 0);
+	if (error)
+		goto out_ipreserv;
+
+	error = gfs2_alloc_di(dip, no_addr, generation);
+
+	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,
+			const struct gfs2_inum_host *inum, unsigned int mode,
+			unsigned int uid, unsigned int gid,
+			const u64 *generation, dev_t dev, struct buffer_head **bhp)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+	struct gfs2_dinode *di;
+	struct buffer_head *dibh;
+	struct timespec tv = CURRENT_TIME;
+
+	dibh = gfs2_meta_new(gl, inum->no_addr);
+	gfs2_trans_add_bh(gl, dibh, 1);
+	gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
+	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+	di = (struct gfs2_dinode *)dibh->b_data;
+
+	di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
+	di->di_num.no_addr = cpu_to_be64(inum->no_addr);
+	di->di_mode = cpu_to_be32(mode);
+	di->di_uid = cpu_to_be32(uid);
+	di->di_gid = cpu_to_be32(gid);
+	di->di_nlink = 0;
+	di->di_size = 0;
+	di->di_blocks = cpu_to_be64(1);
+	di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
+	di->di_major = cpu_to_be32(MAJOR(dev));
+	di->di_minor = cpu_to_be32(MINOR(dev));
+	di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
+	di->di_generation = cpu_to_be64(*generation);
+	di->di_flags = 0;
+
+	if (S_ISREG(mode)) {
+		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
+		    gfs2_tune_get(sdp, gt_new_files_jdata))
+			di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
+	} else if (S_ISDIR(mode)) {
+		di->di_flags |= cpu_to_be32(dip->i_diskflags &
+					    GFS2_DIF_INHERIT_JDATA);
+	}
+
+	di->__pad1 = 0;
+	di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
+	di->di_height = 0;
+	di->__pad2 = 0;
+	di->__pad3 = 0;
+	di->di_depth = 0;
+	di->di_entries = 0;
+	memset(&di->__pad4, 0, sizeof(di->__pad4));
+	di->di_eattr = 0;
+	di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
+	di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
+	di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
+	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
+	
+	set_buffer_uptodate(dibh);
+
+	*bhp = dibh;
+}
+
+static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
+		       unsigned int mode, const struct gfs2_inum_host *inum,
+		       const u64 *generation, dev_t dev, struct buffer_head **bhp)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+	unsigned int uid, gid;
+	int error;
+
+	munge_mode_uid_gid(dip, &mode, &uid, &gid);
+	if (!gfs2_alloc_get(dip))
+		return -ENOMEM;
+
+	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_QUOTA, 0);
+	if (error)
+		goto out_quota;
+
+	init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
+	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, const struct qstr *name,
+		       struct gfs2_inode *ip)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+	struct gfs2_alloc *al;
+	int alloc_required;
+	struct buffer_head *dibh;
+	int error;
+
+	al = gfs2_alloc_get(dip);
+	if (!al)
+		return -ENOMEM;
+
+	error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+	if (error)
+		goto fail;
+
+	error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
+	if (alloc_required < 0)
+		goto fail_quota_locks;
+	if (alloc_required) {
+		error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_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_length +
+					 2 * RES_DINODE +
+					 RES_STATFS + RES_QUOTA, 0);
+		if (error)
+			goto fail_ipreserv;
+	} else {
+		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
+		if (error)
+			goto fail_quota_locks;
+	}
+
+	error = gfs2_dir_add(&dip->i_inode, name, ip);
+	if (error)
+		goto fail_end_trans;
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto fail_end_trans;
+	ip->i_inode.i_nlink = 1;
+	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+	gfs2_dinode_out(ip, dibh->b_data);
+	brelse(dibh);
+	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;
+}
+
+static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
+			      const struct qstr *qstr)
+{
+	int err;
+	size_t len;
+	void *value;
+	char *name;
+
+	err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
+					   &name, &value, &len);
+
+	if (err) {
+		if (err == -EOPNOTSUPP)
+			return 0;
+		return err;
+	}
+
+	err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
+			       GFS2_EATYPE_SECURITY);
+	kfree(value);
+	kfree(name);
+
+	return err;
+}
+
+/**
+ * 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 not NULL, 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: An inode
+ */
+
+struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
+			   unsigned int mode, dev_t dev)
+{
+	struct inode *inode = NULL;
+	struct gfs2_inode *dip = ghs->gh_gl->gl_object;
+	struct inode *dir = &dip->i_inode;
+	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+	struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
+	int error;
+	u64 generation;
+	struct buffer_head *bh = NULL;
+
+	if (!name->len || name->len > GFS2_FNAMESIZE)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	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 = alloc_dinode(dip, &inum.no_addr, &generation);
+	if (error)
+		goto fail_gunlock;
+	inum.no_formal_ino = generation;
+
+	error = gfs2_glock_nq_num(sdp, 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, &inum, &generation, dev, &bh);
+	if (error)
+		goto fail_gunlock2;
+
+	inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
+				  inum.no_formal_ino, 0);
+	if (IS_ERR(inode))
+		goto fail_gunlock2;
+
+	error = gfs2_inode_refresh(GFS2_I(inode));
+	if (error)
+		goto fail_gunlock2;
+
+	error = gfs2_acl_create(dip, inode);
+	if (error)
+		goto fail_gunlock2;
+
+	error = gfs2_security_init(dip, GFS2_I(inode), name);
+	if (error)
+		goto fail_gunlock2;
+
+	error = link_dinode(dip, name, GFS2_I(inode));
+	if (error)
+		goto fail_gunlock2;
+
+	if (bh)
+		brelse(bh);
+	return inode;
+
+fail_gunlock2:
+	gfs2_glock_dq_uninit(ghs + 1);
+	if (inode && !IS_ERR(inode))
+		iput(inode);
+fail_gunlock:
+	gfs2_glock_dq(ghs);
+fail:
+	if (bh)
+		brelse(bh);
+	return ERR_PTR(error);
+}
+/**
+ * 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,
+		       int mode, struct nameidata *nd)
+{
+	struct gfs2_inode *dip = GFS2_I(dir);
+	struct gfs2_sbd *sdp = GFS2_SB(dir);
+	struct gfs2_holder ghs[2];
+	struct inode *inode;
+
+	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+	for (;;) {
+		inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
+		if (!IS_ERR(inode)) {
+			gfs2_trans_end(sdp);
+			if (dip->i_alloc->al_rgd)
+				gfs2_inplace_release(dip);
+			gfs2_quota_unlock(dip);
+			gfs2_alloc_put(dip);
+			gfs2_glock_dq_uninit_m(2, ghs);
+			mark_inode_dirty(inode);
+			break;
+		} else if (PTR_ERR(inode) != -EEXIST ||
+			   (nd && nd->flags & LOOKUP_EXCL)) {
+			gfs2_holder_uninit(ghs);
+			return PTR_ERR(inode);
+		}
+
+		inode = gfs2_lookupi(dir, &dentry->d_name, 0);
+		if (inode) {
+			if (!IS_ERR(inode)) {
+				gfs2_holder_uninit(ghs);
+				break;
+			} else {
+				gfs2_holder_uninit(ghs);
+				return PTR_ERR(inode);
+			}
+		}
+	}
+
+	d_instantiate(dentry, inode);
+
+	return 0;
+}
+
+/**
+ * gfs2_lookup - Look up a filename in a directory and return its inode
+ * @dir: The directory inode
+ * @dentry: The dentry of the new inode
+ * @nd: passed from Linux VFS, ignored by us
+ *
+ * Called by the VFS layer. Lock dir and call gfs2_lookupi()
+ *
+ * Returns: errno
+ */
+
+static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
+				  struct nameidata *nd)
+{
+	struct inode *inode = NULL;
+
+	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
+	if (inode && IS_ERR(inode))
+		return ERR_CAST(inode);
+
+	if (inode) {
+		struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
+		struct gfs2_holder gh;
+		int error;
+		error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+		if (error) {
+			iput(inode);
+			return ERR_PTR(error);
+		}
+		gfs2_glock_dq_uninit(&gh);
+		return d_splice_alias(inode, dentry);
+	}
+	d_add(dentry, inode);
+
+	return NULL;
+}
+
+/**
+ * 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)
+{
+	struct gfs2_inode *dip = GFS2_I(dir);
+	struct gfs2_sbd *sdp = GFS2_SB(dir);
+	struct inode *inode = old_dentry->d_inode;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_holder ghs[2];
+	struct buffer_head *dibh;
+	int alloc_required;
+	int error;
+
+	if (S_ISDIR(inode->i_mode))
+		return -EPERM;
+
+	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+	error = gfs2_glock_nq(ghs); /* parent */
+	if (error)
+		goto out_parent;
+
+	error = gfs2_glock_nq(ghs + 1); /* child */
+	if (error)
+		goto out_child;
+
+	error = -ENOENT;
+	if (inode->i_nlink == 0)
+		goto out_gunlock;
+
+	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
+	if (error)
+		goto out_gunlock;
+
+	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
+	switch (error) {
+	case -ENOENT:
+		break;
+	case 0:
+		error = -EEXIST;
+	default:
+		goto out_gunlock;
+	}
+
+	error = -EINVAL;
+	if (!dip->i_inode.i_nlink)
+		goto out_gunlock;
+	error = -EFBIG;
+	if (dip->i_entries == (u32)-1)
+		goto out_gunlock;
+	error = -EPERM;
+	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+		goto out_gunlock;
+	error = -EINVAL;
+	if (!ip->i_inode.i_nlink)
+		goto out_gunlock;
+	error = -EMLINK;
+	if (ip->i_inode.i_nlink == (u32)-1)
+		goto out_gunlock;
+
+	alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
+	if (error < 0)
+		goto out_gunlock;
+	error = 0;
+
+	if (alloc_required) {
+		struct gfs2_alloc *al = gfs2_alloc_get(dip);
+		if (!al) {
+			error = -ENOMEM;
+			goto out_gunlock;
+		}
+
+		error = gfs2_quota_lock_check(dip);
+		if (error)
+			goto out_alloc;
+
+		al->al_requested = sdp->sd_max_dirres;
+
+		error = gfs2_inplace_reserve(dip);
+		if (error)
+			goto out_gunlock_q;
+
+		error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
+					 gfs2_rg_blocks(al) +
+					 2 * RES_DINODE + RES_STATFS +
+					 RES_QUOTA, 0);
+		if (error)
+			goto out_ipres;
+	} else {
+		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
+		if (error)
+			goto out_ipres;
+	}
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto out_end_trans;
+
+	error = gfs2_dir_add(dir, &dentry->d_name, ip);
+	if (error)
+		goto out_brelse;
+
+	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+	inc_nlink(&ip->i_inode);
+	ip->i_inode.i_ctime = CURRENT_TIME;
+	gfs2_dinode_out(ip, dibh->b_data);
+	mark_inode_dirty(&ip->i_inode);
+
+out_brelse:
+	brelse(dibh);
+out_end_trans:
+	gfs2_trans_end(sdp);
+out_ipres:
+	if (alloc_required)
+		gfs2_inplace_release(dip);
+out_gunlock_q:
+	if (alloc_required)
+		gfs2_quota_unlock(dip);
+out_alloc:
+	if (alloc_required)
+		gfs2_alloc_put(dip);
+out_gunlock:
+	gfs2_glock_dq(ghs + 1);
+out_child:
+	gfs2_glock_dq(ghs);
+out_parent:
+	gfs2_holder_uninit(ghs);
+	gfs2_holder_uninit(ghs + 1);
+	if (!error) {
+		ihold(inode);
+		d_instantiate(dentry, inode);
+		mark_inode_dirty(inode);
+	}
+	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
+ */
+
+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) &&
+	    dip->i_inode.i_uid != current_fsuid() &&
+	    ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
+		return -EPERM;
+
+	if (IS_APPEND(&dip->i_inode))
+		return -EPERM;
+
+	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
+	if (error)
+		return error;
+
+	error = gfs2_dir_check(&dip->i_inode, name, ip);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+/**
+ * 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
+ * @bh: The inode buffer for the inode to be removed
+ * @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,
+			     const struct dentry *dentry,
+			     struct buffer_head *bh)
+{
+	struct inode *inode = dentry->d_inode;
+	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);
+	gfs2_trans_add_bh(ip->i_gl, bh, 1);
+	gfs2_dinode_out(ip, bh->b_data);
+	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
+ * @dentry: The file itself
+ *
+ * This routine uses the type of the inode as a flag to figure out
+ * whether this is an unlink or an rmdir.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct gfs2_inode *dip = GFS2_I(dir);
+	struct gfs2_sbd *sdp = GFS2_SB(dir);
+	struct inode *inode = dentry->d_inode;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct buffer_head *bh;
+	struct gfs2_holder ghs[3];
+	struct gfs2_rgrpd *rgd;
+	struct gfs2_holder ri_gh;
+	int error;
+
+	error = gfs2_rindex_hold(sdp, &ri_gh);
+	if (error)
+		return error;
+
+	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
+	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
+
+
+	error = gfs2_glock_nq(ghs); /* parent */
+	if (error)
+		goto out_parent;
+
+	error = gfs2_glock_nq(ghs + 1); /* child */
+	if (error)
+		goto out_child;
+
+	error = -ENOENT;
+	if (inode->i_nlink == 0)
+		goto out_rgrp;
+
+	if (S_ISDIR(inode->i_mode)) {
+		error = -ENOTEMPTY;
+		if (ip->i_entries > 2 || inode->i_nlink > 2)
+			goto out_rgrp;
+	}
+
+	error = gfs2_glock_nq(ghs + 2); /* rgrp */
+	if (error)
+		goto out_rgrp;
+
+	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
+	if (error)
+		goto out_gunlock;
+
+	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
+	if (error)
+		goto out_gunlock;
+
+	error = gfs2_meta_inode_buffer(ip, &bh);
+	if (error)
+		goto out_end_trans;
+
+	error = gfs2_unlink_inode(dip, dentry, bh);
+	brelse(bh);
+
+out_end_trans:
+	gfs2_trans_end(sdp);
+out_gunlock:
+	gfs2_glock_dq(ghs + 2);
+out_rgrp:
+	gfs2_holder_uninit(ghs + 2);
+	gfs2_glock_dq(ghs + 1);
+out_child:
+	gfs2_holder_uninit(ghs + 1);
+	gfs2_glock_dq(ghs);
+out_parent:
+	gfs2_holder_uninit(ghs);
+	gfs2_glock_dq_uninit(&ri_gh);
+	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)
+{
+	struct gfs2_inode *dip = GFS2_I(dir), *ip;
+	struct gfs2_sbd *sdp = GFS2_SB(dir);
+	struct gfs2_holder ghs[2];
+	struct inode *inode;
+	struct buffer_head *dibh;
+	int size;
+	int error;
+
+	/* Must be stuffed with a null terminator for gfs2_follow_link() */
+	size = strlen(symname);
+	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
+		return -ENAMETOOLONG;
+
+	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+	inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
+	if (IS_ERR(inode)) {
+		gfs2_holder_uninit(ghs);
+		return PTR_ERR(inode);
+	}
+
+	ip = ghs[1].gh_gl->gl_object;
+
+	i_size_write(inode, size);
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+
+	if (!gfs2_assert_withdraw(sdp, !error)) {
+		gfs2_dinode_out(ip, dibh->b_data);
+		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
+		       size);
+		brelse(dibh);
+	}
+
+	gfs2_trans_end(sdp);
+	if (dip->i_alloc->al_rgd)
+		gfs2_inplace_release(dip);
+	gfs2_quota_unlock(dip);
+	gfs2_alloc_put(dip);
+
+	gfs2_glock_dq_uninit_m(2, ghs);
+
+	d_instantiate(dentry, inode);
+	mark_inode_dirty(inode);
+
+	return 0;
+}
+
+/**
+ * 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
+ */
+
+static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	struct gfs2_inode *dip = GFS2_I(dir), *ip;
+	struct gfs2_sbd *sdp = GFS2_SB(dir);
+	struct gfs2_holder ghs[2];
+	struct inode *inode;
+	struct buffer_head *dibh;
+	int error;
+
+	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+	inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
+	if (IS_ERR(inode)) {
+		gfs2_holder_uninit(ghs);
+		return PTR_ERR(inode);
+	}
+
+	ip = ghs[1].gh_gl->gl_object;
+
+	ip->i_inode.i_nlink = 2;
+	i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
+	ip->i_diskflags |= GFS2_DIF_JDATA;
+	ip->i_entries = 2;
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+
+	if (!gfs2_assert_withdraw(sdp, !error)) {
+		struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
+		struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
+
+		gfs2_trans_add_bh(ip->i_gl, dibh, 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);
+		di->di_entries = cpu_to_be32(1);
+
+		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(dip, dent);
+		dent->de_type = cpu_to_be16(DT_DIR);
+
+		gfs2_dinode_out(ip, di);
+
+		brelse(dibh);
+	}
+
+	gfs2_trans_end(sdp);
+	if (dip->i_alloc->al_rgd)
+		gfs2_inplace_release(dip);
+	gfs2_quota_unlock(dip);
+	gfs2_alloc_put(dip);
+