vxfs_super.rar_super

/* * 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);