diff options
Diffstat (limited to 'fs/freevxfs/vxfs_super.c')
| -rw-r--r-- | fs/freevxfs/vxfs_super.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c new file mode 100644 index 00000000000..0ae2c7b8182 --- /dev/null +++ b/fs/freevxfs/vxfs_super.c @@ -0,0 +1,278 @@ +/* + * 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 "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"); + +MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */ + + +static void vxfs_put_super(struct super_block *); +static int vxfs_statfs(struct super_block *, struct kstatfs *); +static int vxfs_remount(struct super_block *, int *, char *); + +static struct super_operations vxfs_super_ops = { + .read_inode = vxfs_read_inode, + .clear_inode = vxfs_clear_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 + * @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: + * No locks held. + * + * Notes: + * This is everything but complete... + */ +static int +vxfs_statfs(struct super_block *sbp, struct kstatfs *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; +} + +static int vxfs_remount(struct super_block *sb, int *flags, char *data) +{ + *flags |= MS_RDONLY; + return 0; +} + +/** + * vxfs_read_super - read superblock into memory and initalize 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 the bkl and @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; + + sbp->s_flags |= MS_RDONLY; + + infp = kmalloc(sizeof(*infp), GFP_KERNEL); + if (!infp) { + printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); + return -ENOMEM; + } + memset(infp, 0, sizeof(*infp)); + + 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 = (void *)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 = iget(sbp, VXFS_ROOT_INO); + sbp->s_root = d_alloc_root(root); + if (!sbp->s_root) { + iput(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 -EINVAL; +} + +/* + * The usual module blurb. + */ +static struct super_block *vxfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); +} + +static struct file_system_type vxfs_fs_type = { + .owner = THIS_MODULE, + .name = "vxfs", + .get_sb = vxfs_get_sb, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; + +static int __init +vxfs_init(void) +{ + vxfs_inode_cachep = kmem_cache_create("vxfs_inode", + sizeof(struct vxfs_inode_info), 0, + SLAB_RECLAIM_ACCOUNT, NULL, NULL); + if (vxfs_inode_cachep) + return (register_filesystem(&vxfs_fs_type)); + return -ENOMEM; +} + +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); |