1 files changed, 334 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c
new file mode 100644
index 000000000..c3b82f716
--- /dev/null
+++ b/fs/freevxfs/vxfs_super.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ * Copyright (c) 2016 Krzysztof Blaszkowski
+ */
+
+/*
+ * Veritas filesystem driver - superblock related routines.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/vfs.h>
+#include <linux/mount.h>
+
+#include "vxfs.h"
+#include "vxfs_extern.h"
+#include "vxfs_dir.h"
+#include "vxfs_inode.h"
+
+
+MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
+MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static struct kmem_cache *vxfs_inode_cachep;
+
+/**
+ * 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);
+
+	iput(infp->vsi_fship);
+	iput(infp->vsi_ilist);
+	iput(infp->vsi_stilist);
+
+	brelse(infp->vsi_bp);
+	kfree(infp);
+}
+
+/**
+ * vxfs_statfs - get filesystem information
+ * @dentry:	VFS dentry to locate superblock
+ * @bufp:	output buffer
+ *
+ * Description:
+ *   vxfs_statfs fills the statfs buffer @bufp with information
+ *   about the filesystem described by @dentry.
+ *
+ * Returns:
+ *   Zero.
+ *
+ * Locking:
+ *   No locks held.
+ *
+ * Notes:
+ *   This is everything but complete...
+ */
+static int
+vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
+{
+	struct vxfs_sb_info		*infp = VXFS_SBI(dentry->d_sb);
+	struct vxfs_sb *raw_sb = infp->vsi_raw;
+
+	bufp->f_type = VXFS_SUPER_MAGIC;
+	bufp->f_bsize = dentry->d_sb->s_blocksize;
+	bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
+	bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
+	bufp->f_bavail = 0;
+	bufp->f_files = 0;
+	bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
+	bufp->f_namelen = VXFS_NAMELEN;
+
+	return 0;
+}
+
+static int vxfs_remount(struct super_block *sb, int *flags, char *data)
+{
+	sync_filesystem(sb);
+	*flags |= SB_RDONLY;
+	return 0;
+}
+
+static struct inode *vxfs_alloc_inode(struct super_block *sb)
+{
+	struct vxfs_inode_info *vi;
+
+	vi = alloc_inode_sb(sb, vxfs_inode_cachep, GFP_KERNEL);
+	if (!vi)
+		return NULL;
+	inode_init_once(&vi->vfs_inode);
+	return &vi->vfs_inode;
+}
+
+static void vxfs_free_inode(struct inode *inode)
+{
+	kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
+}
+
+static const struct super_operations vxfs_super_ops = {
+	.alloc_inode		= vxfs_alloc_inode,
+	.free_inode		= vxfs_free_inode,
+	.evict_inode		= vxfs_evict_inode,
+	.put_super		= vxfs_put_super,
+	.statfs			= vxfs_statfs,
+	.remount_fs		= vxfs_remount,
+};
+
+static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
+		unsigned blk, __fs32 magic)
+{
+	struct buffer_head *bp;
+	struct vxfs_sb *rsbp;
+	struct vxfs_sb_info *infp = VXFS_SBI(sbp);
+	int rc = -ENOMEM;
+
+	bp = sb_bread(sbp, blk);
+	do {
+		if (!bp || !buffer_mapped(bp)) {
+			if (!silent) {
+				printk(KERN_WARNING
+					"vxfs: unable to read disk superblock at %u\n",
+					blk);
+			}
+			break;
+		}
+
+		rc = -EINVAL;
+		rsbp = (struct vxfs_sb *)bp->b_data;
+		if (rsbp->vs_magic != magic) {
+			if (!silent)
+				printk(KERN_NOTICE
+					"vxfs: WRONG superblock magic %08x at %u\n",
+					rsbp->vs_magic, blk);
+			break;
+		}
+
+		rc = 0;
+		infp->vsi_raw = rsbp;
+		infp->vsi_bp = bp;
+	} while (0);
+
+	if (rc) {
+		infp->vsi_raw = NULL;
+		infp->vsi_bp = NULL;
+		brelse(bp);
+	}
+
+	return rc;
+}
+
+/**
+ * vxfs_read_super - read superblock into memory and initialize filesystem
+ * @sbp:		VFS superblock (to fill)
+ * @dp:			fs private mount data
+ * @silent:		do not complain loudly when sth is wrong
+ *
+ * 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 @sbp->s_lock.
+ */
+static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
+{
+	struct vxfs_sb_info	*infp;
+	struct vxfs_sb		*rsbp;
+	u_long			bsize;
+	struct inode *root;
+	int ret = -EINVAL;
+	u32 j;
+
+	sbp->s_flags |= SB_RDONLY;
+
+	infp = kzalloc(sizeof(*infp), GFP_KERNEL);
+	if (!infp) {
+		printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
+		return -ENOMEM;
+	}
+
+	bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
+	if (!bsize) {
+		printk(KERN_WARNING "vxfs: unable to set blocksize\n");
+		goto out;
+	}
+
+	sbp->s_op = &vxfs_super_ops;
+	sbp->s_fs_info = infp;
+	sbp->s_time_min = 0;
+	sbp->s_time_max = U32_MAX;
+
+	if (!vxfs_try_sb_magic(sbp, silent, 1,
+			(__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
+		/* Unixware, x86 */
+		infp->byte_order = VXFS_BO_LE;
+	} else if (!vxfs_try_sb_magic(sbp, silent, 8,
+			(__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
+		/* HP-UX, parisc */
+		infp->byte_order = VXFS_BO_BE;
+	} else {
+		if (!silent)
+			printk(KERN_NOTICE "vxfs: can't find superblock.\n");
+		goto out;
+	}
+
+	rsbp = infp->vsi_raw;
+	j = fs32_to_cpu(infp, rsbp->vs_version);
+	if ((j < 2 || j > 4) && !silent) {
+		printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
+		goto out;
+	}
+
+#ifdef DIAGNOSTIC
+	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
+	printk(KERN_DEBUG "vxfs: blocksize: %d\n",
+		fs32_to_cpu(infp, rsbp->vs_bsize));
+#endif
+
+	sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
+
+	infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
+	infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
+
+	j = fs32_to_cpu(infp, rsbp->vs_bsize);
+	if (!sb_set_blocksize(sbp, j)) {
+		printk(KERN_WARNING "vxfs: unable to set final block size\n");
+		goto out;
+	}
+
+	if (vxfs_read_olt(sbp, bsize)) {
+		printk(KERN_WARNING "vxfs: unable to read olt\n");
+		goto out;
+	}
+
+	if (vxfs_read_fshead(sbp)) {
+		printk(KERN_WARNING "vxfs: unable to read fshead\n");
+		goto out;
+	}
+
+	root = vxfs_iget(sbp, VXFS_ROOT_INO);
+	if (IS_ERR(root)) {
+		ret = PTR_ERR(root);
+		goto out;
+	}
+	sbp->s_root = d_make_root(root);
+	if (!sbp->s_root) {
+		printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
+		goto out_free_ilist;
+	}
+
+	return 0;
+	
+out_free_ilist:
+	iput(infp->vsi_fship);
+	iput(infp->vsi_ilist);
+	iput(infp->vsi_stilist);
+out:
+	brelse(infp->vsi_bp);
+	kfree(infp);
+	return ret;
+}
+
+/*
+ * The usual module blurb.
+ */
+static struct dentry *vxfs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
+}
+
+static struct file_system_type vxfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "vxfs",
+	.mount		= vxfs_mount,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
+MODULE_ALIAS("vxfs");
+
+static int __init
+vxfs_init(void)
+{
+	int rv;
+
+	vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
+			sizeof(struct vxfs_inode_info), 0,
+			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
+			offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
+			sizeof_field(struct vxfs_inode_info,
+				vii_immed.vi_immed),
+			NULL);
+	if (!vxfs_inode_cachep)
+		return -ENOMEM;
+	rv = register_filesystem(&vxfs_fs_type);
+	if (rv < 0)
+		kmem_cache_destroy(vxfs_inode_cachep);
+	return rv;
+}
+
+static void __exit
+vxfs_cleanup(void)
+{
+	unregister_filesystem(&vxfs_fs_type);
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(vxfs_inode_cachep);
+}
+
+module_init(vxfs_init);
+module_exit(vxfs_cleanup);