patch-2.4.5 linux/fs/freevxfs/vxfs_super.c

• Lines: 259
• Date: Mon May 21 12:31:06 2001
• Orig file: v2.4.4/linux/fs/freevxfs/vxfs_super.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/fs/freevxfs/vxfs_super.c linux/fs/freevxfs/vxfs_super.c
@@ -0,0 +1,258 @@
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ident "$Id: vxfs_super.c,v 1.24 2001/05/20 15:21:14 hch Exp hch $"
+
+/*
+ * Veritas filesystem driver - superblock related routines.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+
+#include "vxfs.h"
+#include "vxfs_extern.h"
+#include "vxfs_dir.h"
+#include "vxfs_inode.h"
+
+
+MODULE_AUTHOR("Christoph Hellwig");
+MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
+
+
+static void		vxfs_put_super(struct super_block *);
+static int		vxfs_statfs(struct super_block *, struct statfs *);
+
+
+static struct super_operations vxfs_super_ops = {
+	.read_inode =		vxfs_read_inode,
+	.put_inode =		vxfs_put_inode,
+	.put_super =		vxfs_put_super,
+	.statfs =		vxfs_statfs,
+};
+
+static __inline__ u_long
+vxfs_validate_bsize(kdev_t dev)
+{
+	u_long			bsize;
+	
+	bsize = get_hardsect_size(dev);
+	if (bsize < BLOCK_SIZE)
+		bsize = BLOCK_SIZE;
+
+	set_blocksize(dev, bsize);
+	return (bsize);
+}
+
+/**
+ * vxfs_put_super - free superblock resources
+ * @sbp:	VFS superblock.
+ *
+ * Description:
+ *   vxfs_put_super frees all resources allocated for @sbp
+ *   after the last instance of the filesystem is unmounted.
+ */
+static void
+vxfs_put_super(struct super_block *sbp)
+{
+	struct vxfs_sb_info	*infp = VXFS_SBI(sbp);
+
+	vxfs_put_inode(infp->vsi_fship);
+	vxfs_put_inode(infp->vsi_ilist);
+	vxfs_put_inode(infp->vsi_stilist);
+
+	brelse(infp->vsi_bp);
+	kfree(infp);
+}
+
+/**
+ * vxfs_statfs - get filesystem information
+ * @sbp:	VFS superblock
+ * @bufp:	output buffer
+ *
+ * Description:
+ *   vxfs_statfs fills the statfs buffer @bufp with information
+ *   about the filesystem described by @sbp.
+ *
+ * Returns:
+ *   Zero.
+ *
+ * Locking:
+ *   We are under bkl and @sbp->s_lock.
+ *
+ * Notes:
+ *   This is everything but complete...
+ */
+static int
+vxfs_statfs(struct super_block *sbp, struct statfs *bufp)
+{
+	struct vxfs_sb_info		*infp = VXFS_SBI(sbp);
+
+	bufp->f_type = VXFS_SUPER_MAGIC;
+	bufp->f_bsize = sbp->s_blocksize;
+	bufp->f_blocks = infp->vsi_raw->vs_dsize;
+	bufp->f_bfree = infp->vsi_raw->vs_free;
+	bufp->f_bavail = 0;
+	bufp->f_files = 0;
+	bufp->f_ffree = infp->vsi_raw->vs_ifree;
+	bufp->f_namelen = VXFS_NAMELEN;
+
+	return 0;
+}
+
+/**
+ * vxfs_read_super - read superblock into memory and initalize filesystem
+ * @sbp:		VFS superblock (to fill)
+ * @dp:			fs private mount data
+ * @silent:		???
+ *
+ * Description:
+ *   We are called on the first mount of a filesystem to read the
+ *   superblock into memory and do some basic setup.
+ *
+ * Returns:
+ *   The superblock on success, else %NULL.
+ *
+ * Locking:
+ *   We are under the bkl and @sbp->s_lock.
+ */
+static struct super_block *
+vxfs_read_super(struct super_block *sbp, void *dp, int silent)
+{
+	struct vxfs_sb_info	*infp;
+	struct vxfs_sb		*rsbp;
+	struct buffer_head	*bp;
+	u_long			bsize;
+	kdev_t			dev = sbp->s_dev;
+
+	infp = kmalloc(sizeof(struct vxfs_sb_info), GFP_KERNEL);
+	if (!infp) {
+		printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
+		return NULL;
+	}
+	memset(infp, 0, sizeof(struct vxfs_sb_info));
+
+	bsize = vxfs_validate_bsize(dev);
+
+	bp = bread(dev, 1, bsize);
+	if (!bp) {
+		printk(KERN_WARNING "vxfs: unable to read disk superblock\n");
+		return NULL;
+	}
+
+	rsbp = (struct vxfs_sb *)bp->b_data;
+	if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
+		printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
+		return NULL;
+	}
+
+	if (rsbp->vs_version < 2 || rsbp->vs_version > 4) {
+		printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", rsbp->vs_version);
+		return NULL;
+	}
+
+#ifdef DIAGNOSTIC
+	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
+	printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
+#endif
+
+	sbp->s_magic = rsbp->vs_magic;
+	sbp->u.generic_sbp = (void *)infp;
+
+	infp->vsi_raw = rsbp;
+	infp->vsi_bp = bp;
+	infp->vsi_oltext = rsbp->vs_oltext[0];
+	infp->vsi_oltsize = rsbp->vs_oltsize;
+	
+	sbp->s_blocksize = rsbp->vs_bsize;
+
+	switch (rsbp->vs_bsize) {
+	case 1024:
+		sbp->s_blocksize_bits = 10;
+		break;
+	case 2048:
+		sbp->s_blocksize_bits = 11;
+		break;
+	case 4096:
+		sbp->s_blocksize_bits = 12;
+		break;
+	default:
+		printk(KERN_WARNING "vxfs: unsupported blocksise: %d\n",
+				rsbp->vs_bsize);
+		return NULL;
+	}
+
+	if (vxfs_read_olt(sbp, bsize)) {
+		printk(KERN_WARNING "vxfs: unable to read olt\n");
+		return NULL;
+	}
+
+	if (vxfs_read_fshead(sbp)) {
+		printk(KERN_WARNING "vxfs: unable to read fshead\n");
+		return NULL;
+	}
+
+	sbp->s_op = &vxfs_super_ops;
+	if ((sbp->s_root = d_alloc_root(iget(sbp, VXFS_ROOT_INO))))
+		return (sbp);
+	
+	printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
+	return NULL;
+}
+
+
+/*
+ * The usual module blurb.
+ */
+static DECLARE_FSTYPE_DEV(vxfs_fs_type, "vxfs", vxfs_read_super);
+
+static int __init
+vxfs_init(void)
+{
+	vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
+			sizeof(struct vxfs_inode_info), 0, 0, NULL, NULL);
+	if (vxfs_inode_cachep)
+		return (register_filesystem(&vxfs_fs_type));
+	return 0;
+}
+
+static void __exit
+vxfs_cleanup(void)
+{
+	unregister_filesystem(&vxfs_fs_type);
+	kmem_cache_destroy(vxfs_inode_cachep);
+}
+
+module_init(vxfs_init);
+module_exit(vxfs_cleanup);