[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, 291 insertions, 0 deletions

diff --git a/fs/gfs2/resize.c b/fs/gfs2/resize.c
new file mode 100644
index 000000000000..67d26b99a73c
--- /dev/null
+++ b/fs/gfs2/resize.c
@@ -0,0 +1,291 @@
+/*
+ * 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 <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "bmap.h"
+#include "dir.h"
+#include "glock.h"
+#include "inode.h"
+#include "jdata.h"
+#include "meta_io.h"
+#include "quota.h"
+#include "resize.h"
+#include "rgrp.h"
+#include "super.h"
+#include "trans.h"
+
+/* A single transaction needs to add the structs to rindex and make the
+   statfs change. */
+
+int gfs2_resize_add_rgrps(struct gfs2_sbd *sdp, char __user *buf,
+			  unsigned int size)
+{
+	unsigned int num = size / sizeof(struct gfs2_rindex);
+	struct gfs2_inode *ip = sdp->sd_rindex;
+	struct gfs2_alloc *al = NULL;
+	struct gfs2_holder i_gh;
+	unsigned int data_blocks, ind_blocks;
+	int alloc_required;
+	unsigned int x;
+	int error;
+
+	gfs2_write_calc_reserv(ip, size, &data_blocks, &ind_blocks);
+
+	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
+				   LM_FLAG_PRIORITY | GL_SYNC, &i_gh);
+	if (error)
+		return error;
+
+	if (!gfs2_is_jdata(ip)) {
+		gfs2_consist_inode(ip);
+		error = -EIO;
+		goto out;
+	}
+
+	error = gfs2_write_alloc_required(ip, ip->i_di.di_size, size,
+					  &alloc_required);
+	if (error)
+		goto out;
+
+	if (alloc_required) {
+		al = gfs2_alloc_get(ip);
+
+		al->al_requested = data_blocks + ind_blocks;
+
+		error = gfs2_inplace_reserve(ip);
+		if (error)
+			goto out_alloc;
+
+		error = gfs2_trans_begin(sdp,
+					 al->al_rgd->rd_ri.ri_length +
+					 data_blocks + ind_blocks +
+					 RES_DINODE + RES_STATFS, 0);
+		if (error)
+			goto out_relse;
+	} else {
+		error = gfs2_trans_begin(sdp, data_blocks +
+					 RES_DINODE + RES_STATFS, 0);
+		if (error)
+			goto out;
+	}
+
+	for (x = 0; x < num; x++) {
+		struct gfs2_rindex ri;
+		char ri_buf[sizeof(struct gfs2_rindex)];
+
+		error = copy_from_user(&ri, buf, sizeof(struct gfs2_rindex));
+		if (error) {
+			error = -EFAULT;
+			goto out_trans;
+		}
+		gfs2_rindex_out(&ri, ri_buf);
+
+		error = gfs2_jdata_write_mem(ip, ri_buf, ip->i_di.di_size,
+					     sizeof(struct gfs2_rindex));
+		if (error < 0)
+			goto out_trans;
+		gfs2_assert_withdraw(sdp, error == sizeof(struct gfs2_rindex));
+		error = 0;
+
+		gfs2_statfs_change(sdp, ri.ri_data, ri.ri_data, 0);
+
+		buf += sizeof(struct gfs2_rindex);
+	}
+
+ out_trans:
+	gfs2_trans_end(sdp);
+
+ out_relse:
+	if (alloc_required)
+		gfs2_inplace_release(ip);
+
+ out_alloc:
+	if (alloc_required)
+		gfs2_alloc_put(ip);
+
+ out:
+	ip->i_gl->gl_vn++;
+	gfs2_glock_dq_uninit(&i_gh);
+
+	return error;
+}
+
+static void drop_dentries(struct gfs2_inode *ip)
+{
+	struct inode *inode;
+	struct dentry *d;
+
+	inode = gfs2_ip2v_lookup(ip);
+	if (!inode)
+		return;
+
+ restart:
+	spin_lock(&dcache_lock);
+	list_for_each_entry(d, &inode->i_dentry, d_alias) {
+		if (d_unhashed(d))
+			continue;
+		dget_locked(d);
+		__d_drop(d);
+		spin_unlock(&dcache_lock);
+		dput(d);
+		goto restart;
+	}
+	spin_unlock(&dcache_lock);
+
+	iput(inode);
+}
+
+/* This is called by an ioctl to rename an ordinary file that's represented
+   in the vfs to a hidden system file that isn't represented in the vfs.  It's
+   used to add journals, along with the associated system files, to a fs. */
+
+int gfs2_rename2system(struct gfs2_inode *ip,
+		       struct gfs2_inode *old_dip, char *old_name,
+		       struct gfs2_inode *new_dip, char *new_name)
+{
+	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_holder ghs[3];
+	struct qstr old_qstr, new_qstr;
+	struct gfs2_inum inum;
+	int alloc_required;
+	struct buffer_head *dibh;
+	int error;
+
+	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, ghs);
+	gfs2_holder_init(old_dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+	gfs2_holder_init(new_dip->i_gl, LM_ST_EXCLUSIVE, GL_SYNC, ghs + 2);
+
+	error = gfs2_glock_nq_m(3, ghs);
+	if (error)
+		goto out;	
+
+	error = -EMLINK;
+	if (ip->i_di.di_nlink != 1)
+		goto out_gunlock;
+	error = -EINVAL;
+	if (!S_ISREG(ip->i_di.di_mode))
+		goto out_gunlock;
+
+	old_qstr.name = old_name;
+	old_qstr.len = strlen(old_name);
+	error = gfs2_dir_search(old_dip, &old_qstr, &inum, NULL);
+	switch (error) {
+	case 0:
+		break;
+	default:
+		goto out_gunlock;
+	}
+
+	error = -EINVAL;
+	if (!gfs2_inum_equal(&inum, &ip->i_num))
+		goto out_gunlock;
+
+	new_qstr.name = new_name;
+	new_qstr.len = strlen(new_name);
+	error = gfs2_dir_search(new_dip, &new_qstr, NULL, NULL);
+	switch (error) {
+	case -ENOENT:
+		break;
+	case 0:
+		error = -EEXIST;
+	default:
+		goto out_gunlock;
+	}
+
+	gfs2_alloc_get(ip);
+
+	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+	if (error)
+		goto out_alloc;
+
+	error = gfs2_diradd_alloc_required(new_dip, &new_qstr, &alloc_required);
+	if (error)
+		goto out_unhold;
+
+	if (alloc_required) {
+		struct gfs2_alloc *al = gfs2_alloc_get(new_dip);
+
+		al->al_requested = sdp->sd_max_dirres;
+
+		error = gfs2_inplace_reserve(new_dip);
+		if (error)
+			goto out_alloc2;
+
+		error = gfs2_trans_begin(sdp,
+					 sdp->sd_max_dirres +
+					 al->al_rgd->rd_ri.ri_length +
+					 3 * RES_DINODE + RES_LEAF +
+					 RES_STATFS + RES_QUOTA, 0);
+		if (error)
+			goto out_ipreserv;
+	} else {
+		error = gfs2_trans_begin(sdp,
+					 3 * RES_DINODE + 2 * RES_LEAF +
+					 RES_QUOTA, 0);
+		if (error)
+			goto out_unhold;
+	}
+	
+	error = gfs2_dir_del(old_dip, &old_qstr);
+	if (error)
+		goto out_trans;
+
+	error = gfs2_dir_add(new_dip, &new_qstr, &ip->i_num,
+			     IF2DT(ip->i_di.di_mode));
+	if (error)
+		goto out_trans;
+
+	gfs2_quota_change(ip, -ip->i_di.di_blocks, ip->i_di.di_uid,
+			  ip->i_di.di_gid);
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto out_trans;
+	ip->i_di.di_flags |= GFS2_DIF_SYSTEM;
+	gfs2_trans_add_bh(ip->i_gl, dibh);
+	gfs2_dinode_out(&ip->i_di, dibh->b_data);
+	brelse(dibh);
+
+	drop_dentries(ip);
+
+ out_trans:
+	gfs2_trans_end(sdp);
+
+ out_ipreserv:
+	if (alloc_required)
+		gfs2_inplace_release(new_dip);
+
+ out_alloc2:
+	if (alloc_required)
+		gfs2_alloc_put(new_dip);
+
+ out_unhold:
+	gfs2_quota_unhold(ip);
+
+ out_alloc:
+	gfs2_alloc_put(ip);
+
+ out_gunlock:
+	gfs2_glock_dq_m(3, ghs);
+
+ out:
+	gfs2_holder_uninit(ghs);
+	gfs2_holder_uninit(ghs + 1);
+	gfs2_holder_uninit(ghs + 2);
+
+	return error;
+}
+