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