--- /dev/null
+/*
+ * 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.
+ */
+
+/*
+ * 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");
+MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+
+
+static void vxfs_put_super(struct super_block *);
+static int vxfs_statfs(struct dentry *, struct kstatfs *);
+static int vxfs_remount(struct super_block *, int *, char *);
+
+static const struct super_operations vxfs_super_ops = {
+ .evict_inode = vxfs_evict_inode,
+ .put_super = vxfs_put_super,
+ .statfs = vxfs_statfs,
+ .remount_fs = vxfs_remount,
+};
+
+/**
+ * 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_fake_inode(infp->vsi_fship);
+ vxfs_put_fake_inode(infp->vsi_ilist);
+ vxfs_put_fake_inode(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);
+
+ bufp->f_type = VXFS_SUPER_MAGIC;
+ bufp->f_bsize = dentry->d_sb->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;
+}
+
+static int vxfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ sync_filesystem(sb);
+ *flags |= MS_RDONLY;
+ return 0;
+}
+
+/**
+ * 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;
+ struct buffer_head *bp = NULL;
+ u_long bsize;
+ struct inode *root;
+ int ret = -EINVAL;
+
+ sbp->s_flags |= MS_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;
+ }
+
+ bp = sb_bread(sbp, 1);
+ if (!bp || !buffer_mapped(bp)) {
+ if (!silent) {
+ printk(KERN_WARNING
+ "vxfs: unable to read disk superblock\n");
+ }
+ goto out;
+ }
+
+ rsbp = (struct vxfs_sb *)bp->b_data;
+ if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
+ if (!silent)
+ printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
+ goto out;
+ }
+
+ if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
+ printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
+ rsbp->vs_version);
+ goto out;
+ }
+
+#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->s_fs_info = infp;
+
+ infp->vsi_raw = rsbp;
+ infp->vsi_bp = bp;
+ infp->vsi_oltext = rsbp->vs_oltext[0];
+ infp->vsi_oltsize = rsbp->vs_oltsize;
+
+ if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
+ 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;
+ }
+
+ sbp->s_op = &vxfs_super_ops;
+ 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:
+ vxfs_put_fake_inode(infp->vsi_fship);
+ vxfs_put_fake_inode(infp->vsi_ilist);
+ vxfs_put_fake_inode(infp->vsi_stilist);
+out:
+ brelse(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("vxfs_inode",
+ sizeof(struct vxfs_inode_info), 0,
+ SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 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);
Code Review / kvmfornfv.git / blobdiff