/*
* linux/fs/ufs/ufs_super.c
*
* Copyright (C) 1996
* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
* Laboratory for Computer Science Research Computing Facility
* Rutgers, The State University of New Jersey
*
* $Id: ufs_super.c,v 1.3 1996/04/25 09:12:09 davem Exp $
*
*/
/*
* Kernel module support added on 96/04/26 by
* Stefan Reinauer <stepan@home.culture.mipt.ru>
*
* Module usage counts added on 96/04/29 by
* Gertjan van Wingerde <gertjan@cs.vu.nl>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/ufs_fs.h>
#include <linux/module.h>
#include <linux/locks.h>
#include <asm/segment.h>
struct super_block * ufs_read_super(struct super_block * sb, void * data, int silent);
void ufs_put_super (struct super_block * sb);
void ufs_statfs(struct super_block * sb, struct statfs * buf, int bufsize);
extern void ufs_read_inode(struct inode * inode);
extern void ufs_put_inode(struct inode * inode);
static struct super_operations ufs_super_ops = {
ufs_read_inode,
NULL, /* notify_change() */
NULL, /* XXX - ufs_write_inode() */
ufs_put_inode,
ufs_put_super,
NULL, /* XXX - ufs_write_super() */
ufs_statfs,
NULL, /* XXX - ufs_remount() */
};
static struct file_system_type ufs_fs_type = {
ufs_read_super, "ufs", 1, NULL
};
int
init_ufs_fs(void)
{
return(register_filesystem(&ufs_fs_type));
}
#ifdef MODULE
int init_module(void)
{
int status;
if ((status = init_ufs_fs()) == 0)
register_symtab(0);
return status;
}
void cleanup_module(void)
{
unregister_filesystem(&ufs_fs_type);
}
#endif
#if 0 /* unused */
static void
ufs_print_super_stuff(struct super_block * sb, struct ufs_superblock * usb)
{
printk("fs_sblkno: 0x%8.8x\n", usb->fs_sblkno);
printk("fs_size: 0x%8.8x\n", usb->fs_size);
printk("fs_ncg: 0x%8.8x\n", usb->fs_ncg);
printk("fs_bsize: 0x%8.8x\n", usb->fs_bsize);
printk("fs_frag: 0x%8.8x\n", usb->fs_frag);
printk("fs_nindir: 0x%8.8x\n", usb->fs_nindir);
printk("fs_inopb: 0x%8.8x\n", usb->fs_inopb);
printk("fs_optim: 0x%8.8x\n", usb->fs_optim);
printk("fs_ncyl: 0x%8.8x\n", usb->fs_ncyl);
printk("fs_state: 0x%8.8x\n", usb->fs_state);
printk("fs_magic: 0x%8.8x\n", usb->fs_magic);
printk("fs_fsmnt: `%s'\n", usb->fs_fsmnt);
return;
}
#endif
struct super_block *
ufs_read_super(struct super_block * sb, void * data, int silent)
{
struct ufs_superblock * usb;
struct buffer_head * bh1, *bh2;
/* sb->s_dev and sb->s_flags are set by our caller
* data is the mystery argument to sys_mount()
*
* Our caller also sets s_dev, s_covered, s_rd_only, s_dirt,
* and s_type when we return.
*/
MOD_INC_USE_COUNT;
lock_super (sb);
/* XXX - make everything read only for testing */
sb->s_flags |= MS_RDONLY;
if (!(bh1 = bread(sb->s_dev, UFS_SBLOCK/BLOCK_SIZE, BLOCK_SIZE)) ||
!(bh2 = bread(sb->s_dev, (UFS_SBLOCK + BLOCK_SIZE)/BLOCK_SIZE,
BLOCK_SIZE))) {
sb->s_dev = 0;
unlock_super (sb);
if (bh1) {
brelse(bh1);
}
printk ("ufs_read_super: unable to read superblock\n");
MOD_DEC_USE_COUNT;
return(NULL);
}
/* XXX - redo this so we can free it later... */
usb = (struct ufs_superblock *)__get_free_page(GFP_KERNEL);
if (usb == NULL) {
sb->s_dev=0;
unlock_super(sb);
brelse(bh1);
brelse(bh2);
printk ("ufs_read_super: get_free_page() failed\n");
MOD_DEC_USE_COUNT;
return (NULL);
}
memcpy((char *)usb, bh1->b_data, BLOCK_SIZE);
memcpy((char *)usb + BLOCK_SIZE, bh2->b_data,
sizeof(struct ufs_superblock) - BLOCK_SIZE);
brelse(bh1);
brelse(bh2);
if (usb->fs_magic != UFS_MAGIC) {
/* XXX - replace hard-coded constant with a byte-swap macro */
if (usb->fs_magic == 0x54190100) {
printk ("ufs_read_super: can't grok byteswapped fs on dev %d/%d\n",
MAJOR(sb->s_dev), MINOR(sb->s_dev));
silent = 1;
}
sb->s_dev = 0;
unlock_super (sb);
if (!silent)
printk ("ufs_read_super: bad magic number 0x%8.8x on dev %d/%d\n",
usb->fs_magic, MAJOR(sb->s_dev),
MINOR(sb->s_dev));
MOD_DEC_USE_COUNT;
return(NULL);
}
/* We found a UFS filesystem on this device. */
/* XXX - parse args */
if (usb->fs_bsize != UFS_BSIZE) {
printk("ufs_read_super: fs_bsize %d != %d\n", usb->fs_bsize,
UFS_BSIZE);
goto ufs_read_super_lose;
}
if (usb->fs_fsize != UFS_FSIZE) {
printk("ufs_read_super: fs_fsize %d != %d\n", usb->fs_fsize,
UFS_FSIZE);
goto ufs_read_super_lose;
}
if (usb->fs_nindir != UFS_NINDIR) {
printk("ufs_read_super: fs_nindir %d != %d\n", usb->fs_nindir,
UFS_NINDIR);
printk("ufs_read_super: fucking Sun blows me\n");
}
printk("ufs_read_super: fs last mounted on \"%s\"\n", usb->fs_fsmnt);
if (usb->fs_state == UFS_FSOK - usb->fs_time) {
switch(usb->fs_clean) {
case UFS_FSCLEAN:
printk("ufs_read_super: fs is clean\n");
break;
case UFS_FSSTABLE:
printk("ufs_read_super: fs is stable\n");
break;
case UFS_FSACTIVE:
printk("ufs_read_super: fs is active\n");
sb->s_flags |= MS_RDONLY;
break;
case UFS_FSBAD:
printk("ufs_read_super: fs is bad\n");
sb->s_flags |= MS_RDONLY;
break;
default:
printk("ufs_read_super: can't grok fs_clean 0x%x\n",
usb->fs_clean);
sb->s_flags |= MS_RDONLY;
break;
}
} else {
printk("ufs_read_super: fs needs fsck\n");
sb->s_flags |= MS_RDONLY;
/* XXX - make it read only or barf if it's not (/, /usr) */
}
/* XXX - sanity check sb fields */
sb->s_blocksize = usb->fs_fsize;
sb->s_blocksize_bits = 10; /* XXX */
/* XXX - sb->s_lock */
sb->s_op = &ufs_super_ops;
sb->dq_op = 0; /* XXX */
sb->s_magic = usb->fs_magic;
/* sb->s_time */
/* sb->s_wait */
/* XXX - sb->u.ufs_sb */
sb->u.ufs_sb.s_raw_sb = usb; /* XXX - maybe move this to the top */
sb->u.ufs_sb.s_flags = 0;
sb->u.ufs_sb.s_ncg = usb->fs_ncg;
sb->u.ufs_sb.s_ipg = usb->fs_ipg;
sb->u.ufs_sb.s_fpg = usb->fs_fpg;
sb->u.ufs_sb.s_fsize = usb->fs_fsize;
sb->u.ufs_sb.s_bsize = usb->fs_bsize;
sb->u.ufs_sb.s_iblkno = usb->fs_iblkno;
sb->u.ufs_sb.s_dblkno = usb->fs_dblkno;
sb->u.ufs_sb.s_cgoffset = usb->fs_cgoffset;
sb->u.ufs_sb.s_cgmask = usb->fs_cgmask;
sb->u.ufs_sb.s_inopb = usb->fs_inopb;
sb->u.ufs_sb.s_fsfrag = usb->fs_frag; /* XXX - rename this later */
sb->s_mounted = iget(sb, UFS_ROOTINO);
printk("ufs_read_super: inopb %u\n", sb->u.ufs_sb.s_inopb);
/*
* XXX - read cg structs?
*/
unlock_super(sb);
return(sb);
ufs_read_super_lose:
/* XXX - clean up */
MOD_DEC_USE_COUNT;
return(NULL);
}
void ufs_put_super (struct super_block * sb)
{
printk("ufs_put_super\n"); /* XXX */
lock_super (sb);
/* XXX - sync fs data, set state to ok, and flush buffers */
sb->s_dev = 0;
/* XXX - free allocated kernel memory */
unlock_super (sb);
MOD_DEC_USE_COUNT;
return;
}
void ufs_statfs(struct super_block * sb, struct statfs * buf, int bufsiz)
{
struct statfs tmp;
printk("ufs_statfs\n"); /* XXX */
tmp.f_type = sb->s_magic;
tmp.f_bsize = PAGE_SIZE;
tmp.f_blocks = sb->u.ufs_sb.s_raw_sb->fs_dsize;
tmp.f_bfree = sb->u.ufs_sb.s_raw_sb->fs_cstotal.cs_nbfree;
tmp.f_bavail = sb->u.ufs_sb.s_raw_sb->fs_cstotal.cs_nbfree; /* XXX */
tmp.f_files = sb->u.ufs_sb.s_ncg * sb->u.ufs_sb.s_ipg;
tmp.f_ffree = sb->u.ufs_sb.s_raw_sb->fs_cstotal.cs_nifree;
tmp.f_fsid.val[0] = sb->u.ufs_sb.s_raw_sb->fs_id[0];
tmp.f_fsid.val[1] = sb->u.ufs_sb.s_raw_sb->fs_id[1];
tmp.f_namelen = UFS_MAXNAMLEN;
/* tmp.f_spare[6] */
memcpy_tofs(buf, &tmp, bufsiz);
return;
}
/*
* Local Variables: ***
* c-indent-level: 8 ***
* c-continued-statement-offset: 8 ***
* c-brace-offset: -8 ***
* c-argdecl-indent: 0 ***
* c-label-offset: -8 ***
* End: ***
*/
