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/*
* 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
*
* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
*
* $Id: ufs_super.c,v 1.23 1997/04/16 04:53:39 tdyas 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/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/ufs_fs.h>
#include <linux/locks.h>
#include <linux/init.h>
#include <asm/uaccess.h>
int ufs_need_swab = 0;
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);
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
};
__initfunc(int init_ufs_fs(void))
{
return(register_filesystem(&ufs_fs_type));
}
#ifdef MODULE
EXPORT_NO_SYMBOLS;
int init_module(void)
{
return init_ufs_fs();
}
void cleanup_module(void)
{
unregister_filesystem(&ufs_fs_type);
}
#endif
static char error_buf[1024];
void ufs_warning (struct super_block * sb, const char * function,
const char * fmt, ...)
{
va_list args;
va_start (args, fmt);
vsprintf (error_buf, fmt, args);
va_end (args);
printk (KERN_WARNING "UFS warning (device %s): %s: %s\n",
kdevname(sb->s_dev), function, error_buf);
}
#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))) {
if (bh1) {
brelse(bh1);
}
printk ("ufs_read_super: unable to read superblock\n");
goto ufs_read_super_lose;
}
/* XXX - redo this so we can free it later... */
usb = (struct ufs_superblock *)__get_free_page(GFP_KERNEL);
if (usb == NULL) {
brelse(bh1);
brelse(bh2);
printk ("ufs_read_super: get_free_page() failed\n");
goto ufs_read_super_lose;
}
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);
ufs_need_swab = 0;
sb->s_magic = ufs_swab32(usb->fs_magic);
if (sb->s_magic != UFS_MAGIC) {
ufs_need_swab = 1;
sb->s_magic = ufs_swab32(usb->fs_magic);
if (sb->s_magic != UFS_MAGIC) {
printk ("ufs_read_super: bad magic number 0x%8.8lx "
"on dev %d/%d\n", sb->s_magic,
MAJOR(sb->s_dev), MINOR(sb->s_dev));
goto ufs_read_super_lose;
}
}
/* We found a UFS filesystem on this device. */
/* XXX - parse args */
if (ufs_swab32(usb->fs_bsize) != UFS_BSIZE) {
printk("ufs_read_super: fs_bsize %d != %d\n", ufs_swab32(usb->fs_bsize),
UFS_BSIZE);
goto ufs_read_super_lose;
}
if (ufs_swab32(usb->fs_fsize) != UFS_FSIZE) {
printk("ufs_read_super: fs_fsize %d != %d\n", ufs_swab32(usb->fs_fsize),
UFS_FSIZE);
goto ufs_read_super_lose;
}
#ifdef DEBUG_UFS_SUPER
printk("ufs_read_super: fs last mounted on \"%s\"\n", usb->fs_fsmnt);
#endif
if (ufs_swab32(usb->fs_state) == UFS_FSOK - ufs_swab32(usb->fs_time)) {
switch(usb->fs_clean) {
case UFS_FSCLEAN:
#ifdef DEBUG_UFS_SUPER
printk("ufs_read_super: fs is clean\n");
#endif
break;
case UFS_FSSTABLE:
#ifdef DEBUG_UFS_SUPER
printk("ufs_read_super: fs is stable\n");
#endif
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 */
/* KRR - Why are we not using fs_bsize for blocksize? */
sb->s_blocksize = ufs_swab32(usb->fs_fsize);
sb->s_blocksize_bits = ufs_swab32(usb->fs_fshift);
/* XXX - sb->s_lock */
sb->s_op = &ufs_super_ops;
sb->dq_op = 0; /* XXX */
/* KRR - defined above - 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 = ufs_swab32(usb->fs_ncg);
sb->u.ufs_sb.s_ipg = ufs_swab32(usb->fs_ipg);
sb->u.ufs_sb.s_fpg = ufs_swab32(usb->fs_fpg);
sb->u.ufs_sb.s_fsize = ufs_swab32(usb->fs_fsize);
sb->u.ufs_sb.s_fmask = ufs_swab32(usb->fs_fmask);
sb->u.ufs_sb.s_fshift = ufs_swab32(usb->fs_fshift);
sb->u.ufs_sb.s_bsize = ufs_swab32(usb->fs_bsize);
sb->u.ufs_sb.s_bmask = ufs_swab32(usb->fs_bmask);
sb->u.ufs_sb.s_bshift = ufs_swab32(usb->fs_bshift);
sb->u.ufs_sb.s_iblkno = ufs_swab32(usb->fs_iblkno);
sb->u.ufs_sb.s_dblkno = ufs_swab32(usb->fs_dblkno);
sb->u.ufs_sb.s_cgoffset = ufs_swab32(usb->fs_cgoffset);
sb->u.ufs_sb.s_cgmask = ufs_swab32(usb->fs_cgmask);
sb->u.ufs_sb.s_inopb = ufs_swab32(usb->fs_inopb);
sb->u.ufs_sb.s_lshift = ufs_swab32(usb->fs_bshift) - ufs_swab32(usb->fs_fshift);
sb->u.ufs_sb.s_lmask = ~((ufs_swab32(usb->fs_fmask) - ufs_swab32(usb->fs_bmask))
>> ufs_swab32(usb->fs_fshift));
sb->u.ufs_sb.s_fsfrag = ufs_swab32(usb->fs_frag); /* XXX - rename this later */
sb->s_mounted = iget(sb, UFS_ROOTINO);
#ifdef DEBUG_UFS_SUPER
printk("ufs_read_super: inopb %u\n", sb->u.ufs_sb.s_inopb);
#endif
/*
* XXX - read cg structs?
*/
unlock_super(sb);
return(sb);
ufs_read_super_lose:
/* XXX - clean up */
sb->s_dev = 0;
unlock_super (sb);
MOD_DEC_USE_COUNT;
return(NULL);
}
void ufs_put_super (struct super_block * sb)
{
if (sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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;
struct statfs *sp = &tmp;
struct ufs_superblock *fsb = sb->u.ufs_sb.s_raw_sb;
unsigned long used, avail;
if (sb->u.ufs_sb.s_flags & UFS_DEBUG) {
printk("ufs_statfs\n"); /* XXX */
}
sp->f_type = sb->s_magic;
sp->f_bsize = sb->s_blocksize;
sp->f_blocks = ufs_swab32(fsb->fs_dsize);
sp->f_bfree = ufs_swab32(fsb->fs_cstotal.cs_nbfree) *
ufs_swab32(fsb->fs_frag) +
ufs_swab32(fsb->fs_cstotal.cs_nffree);
avail = sp->f_blocks - (sp->f_blocks / 100) *
ufs_swab32(fsb->fs_minfree);
used = sp->f_blocks - sp->f_bfree;
if (avail > used)
sp->f_bavail = avail - used;
else
sp->f_bavail = 0;
sp->f_files = sb->u.ufs_sb.s_ncg * sb->u.ufs_sb.s_ipg;
sp->f_ffree = ufs_swab32(fsb->fs_cstotal.cs_nifree);
sp->f_fsid.val[0] = ufs_swab32(fsb->fs_id[0]);
sp->f_fsid.val[1] = ufs_swab32(fsb->fs_id[1]);
sp->f_namelen = UFS_MAXNAMLEN;
copy_to_user(buf, sp, bufsiz);
return;
}
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