/* * 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 1.1.1.1 2003/06/23 22:18:37 jharrell Exp $" /* * Veritas filesystem driver - superblock related routines. */ #include #include #include #include #include #include #include #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 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_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: * 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: 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 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) { 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_blocksize = rsbp->vs_bsize; 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; 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: if (!silent) { printk(KERN_WARNING "vxfs: unsupported blocksise: %d\n", rsbp->vs_bsize); } 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; sbp->s_root = d_alloc_root(iget(sbp, VXFS_ROOT_INO)); if (!sbp->s_root) { printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); goto out_free_ilist; } return (sbp); 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 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 -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);