512 lines
12 KiB
C
512 lines
12 KiB
C
/*
|
|
* linux/fs/minix/inode.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/minix_fs.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/locks.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/bitops.h>
|
|
|
|
void minix_put_inode(struct inode *inode)
|
|
{
|
|
if (inode->i_nlink)
|
|
return;
|
|
inode->i_size = 0;
|
|
minix_truncate(inode);
|
|
minix_free_inode(inode);
|
|
}
|
|
|
|
static void minix_commit_super (struct super_block * sb,
|
|
struct minix_super_block * ms)
|
|
{
|
|
sb->u.minix_sb.s_sbh->b_dirt = 1;
|
|
sb->s_dirt = 0;
|
|
}
|
|
|
|
void minix_write_super (struct super_block * sb)
|
|
{
|
|
struct minix_super_block * ms;
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
ms = sb->u.minix_sb.s_ms;
|
|
|
|
if (ms->s_state & MINIX_VALID_FS)
|
|
ms->s_state &= ~MINIX_VALID_FS;
|
|
minix_commit_super (sb, ms);
|
|
}
|
|
sb->s_dirt = 0;
|
|
}
|
|
|
|
|
|
void minix_put_super(struct super_block *sb)
|
|
{
|
|
int i;
|
|
|
|
lock_super(sb);
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
|
|
sb->u.minix_sb.s_sbh->b_dirt = 1;
|
|
}
|
|
sb->s_dev = 0;
|
|
for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++)
|
|
brelse(sb->u.minix_sb.s_imap[i]);
|
|
for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++)
|
|
brelse(sb->u.minix_sb.s_zmap[i]);
|
|
brelse (sb->u.minix_sb.s_sbh);
|
|
unlock_super(sb);
|
|
return;
|
|
}
|
|
|
|
static struct super_operations minix_sops = {
|
|
minix_read_inode,
|
|
NULL,
|
|
minix_write_inode,
|
|
minix_put_inode,
|
|
minix_put_super,
|
|
minix_write_super,
|
|
minix_statfs,
|
|
minix_remount
|
|
};
|
|
|
|
int minix_remount (struct super_block * sb, int * flags, char * data)
|
|
{
|
|
struct minix_super_block * ms;
|
|
|
|
ms = sb->u.minix_sb.s_ms;
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
|
return 0;
|
|
if (*flags & MS_RDONLY) {
|
|
if (ms->s_state & MINIX_VALID_FS ||
|
|
!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
|
|
return 0;
|
|
/* Mounting a rw partition read-only. */
|
|
ms->s_state = sb->u.minix_sb.s_mount_state;
|
|
sb->u.minix_sb.s_sbh->b_dirt = 1;
|
|
sb->s_dirt = 1;
|
|
minix_commit_super (sb, ms);
|
|
}
|
|
else {
|
|
/* Mount a partition which is read-only, read-write. */
|
|
sb->u.minix_sb.s_mount_state = ms->s_state;
|
|
ms->s_state &= ~MINIX_VALID_FS;
|
|
sb->u.minix_sb.s_sbh->b_dirt = 1;
|
|
sb->s_dirt = 1;
|
|
|
|
if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
|
|
printk ("MINIX-fs warning: remounting unchecked fs, "
|
|
"running fsck is recommended.\n");
|
|
else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
|
|
printk ("MINIX-fs warning: remounting fs with errors, "
|
|
"running fsck is recommended.\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct super_block *minix_read_super(struct super_block *s,void *data,
|
|
int silent)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct minix_super_block *ms;
|
|
int i,dev=s->s_dev,block;
|
|
|
|
if (32 != sizeof (struct minix_inode))
|
|
panic("bad i-node size");
|
|
lock_super(s);
|
|
if (!(bh = bread(dev,1,BLOCK_SIZE))) {
|
|
s->s_dev=0;
|
|
unlock_super(s);
|
|
printk("MINIX-fs: unable to read superblock\n");
|
|
return NULL;
|
|
}
|
|
ms = (struct minix_super_block *) bh->b_data;
|
|
s->u.minix_sb.s_ms = ms;
|
|
s->u.minix_sb.s_sbh = bh;
|
|
s->u.minix_sb.s_mount_state = ms->s_state;
|
|
s->s_blocksize = 1024;
|
|
s->s_blocksize_bits = 10;
|
|
s->u.minix_sb.s_ninodes = ms->s_ninodes;
|
|
s->u.minix_sb.s_nzones = ms->s_nzones;
|
|
s->u.minix_sb.s_imap_blocks = ms->s_imap_blocks;
|
|
s->u.minix_sb.s_zmap_blocks = ms->s_zmap_blocks;
|
|
s->u.minix_sb.s_firstdatazone = ms->s_firstdatazone;
|
|
s->u.minix_sb.s_log_zone_size = ms->s_log_zone_size;
|
|
s->u.minix_sb.s_max_size = ms->s_max_size;
|
|
s->s_magic = ms->s_magic;
|
|
if (s->s_magic == MINIX_SUPER_MAGIC) {
|
|
s->u.minix_sb.s_dirsize = 16;
|
|
s->u.minix_sb.s_namelen = 14;
|
|
} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
|
|
s->u.minix_sb.s_dirsize = 32;
|
|
s->u.minix_sb.s_namelen = 30;
|
|
} else {
|
|
s->s_dev = 0;
|
|
unlock_super(s);
|
|
brelse(bh);
|
|
if (!silent)
|
|
printk("VFS: Can't find a minix filesystem on dev 0x%04x.\n", dev);
|
|
return NULL;
|
|
}
|
|
for (i=0;i < MINIX_I_MAP_SLOTS;i++)
|
|
s->u.minix_sb.s_imap[i] = NULL;
|
|
for (i=0;i < MINIX_Z_MAP_SLOTS;i++)
|
|
s->u.minix_sb.s_zmap[i] = NULL;
|
|
block=2;
|
|
for (i=0 ; i < s->u.minix_sb.s_imap_blocks ; i++)
|
|
if ((s->u.minix_sb.s_imap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
|
|
block++;
|
|
else
|
|
break;
|
|
for (i=0 ; i < s->u.minix_sb.s_zmap_blocks ; i++)
|
|
if ((s->u.minix_sb.s_zmap[i]=bread(dev,block,BLOCK_SIZE)) != NULL)
|
|
block++;
|
|
else
|
|
break;
|
|
if (block != 2+s->u.minix_sb.s_imap_blocks+s->u.minix_sb.s_zmap_blocks) {
|
|
for(i=0;i<MINIX_I_MAP_SLOTS;i++)
|
|
brelse(s->u.minix_sb.s_imap[i]);
|
|
for(i=0;i<MINIX_Z_MAP_SLOTS;i++)
|
|
brelse(s->u.minix_sb.s_zmap[i]);
|
|
s->s_dev=0;
|
|
unlock_super(s);
|
|
brelse(bh);
|
|
printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
|
|
return NULL;
|
|
}
|
|
set_bit(0,s->u.minix_sb.s_imap[0]->b_data);
|
|
set_bit(0,s->u.minix_sb.s_zmap[0]->b_data);
|
|
unlock_super(s);
|
|
/* set up enough so that it can read an inode */
|
|
s->s_dev = dev;
|
|
s->s_op = &minix_sops;
|
|
s->s_mounted = iget(s,MINIX_ROOT_INO);
|
|
if (!s->s_mounted) {
|
|
s->s_dev = 0;
|
|
brelse(bh);
|
|
printk("MINIX-fs: get root inode failed\n");
|
|
return NULL;
|
|
}
|
|
if (!(s->s_flags & MS_RDONLY)) {
|
|
ms->s_state &= ~MINIX_VALID_FS;
|
|
bh->b_dirt = 1;
|
|
s->s_dirt = 1;
|
|
}
|
|
if (!(s->u.minix_sb.s_mount_state & MINIX_VALID_FS))
|
|
printk ("MINIX-fs: mounting unchecked file system, "
|
|
"running fsck is recommended.\n");
|
|
else if (s->u.minix_sb.s_mount_state & MINIX_ERROR_FS)
|
|
printk ("MINIX-fs: mounting file system with errors, "
|
|
"running fsck is recommended.\n");
|
|
return s;
|
|
}
|
|
|
|
void minix_statfs(struct super_block *sb, struct statfs *buf)
|
|
{
|
|
long tmp;
|
|
|
|
put_fs_long(MINIX_SUPER_MAGIC, &buf->f_type);
|
|
put_fs_long(1024, &buf->f_bsize);
|
|
tmp = sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone;
|
|
tmp <<= sb->u.minix_sb.s_log_zone_size;
|
|
put_fs_long(tmp, &buf->f_blocks);
|
|
tmp = minix_count_free_blocks(sb);
|
|
put_fs_long(tmp, &buf->f_bfree);
|
|
put_fs_long(tmp, &buf->f_bavail);
|
|
put_fs_long(sb->u.minix_sb.s_ninodes, &buf->f_files);
|
|
put_fs_long(minix_count_free_inodes(sb), &buf->f_ffree);
|
|
put_fs_long(sb->u.minix_sb.s_namelen, &buf->f_namelen);
|
|
/* Don't know what value to put in buf->f_fsid */
|
|
}
|
|
|
|
#define inode_bmap(inode,nr) ((inode)->u.minix_i.i_data[(nr)])
|
|
|
|
static int block_bmap(struct buffer_head * bh, int nr)
|
|
{
|
|
int tmp;
|
|
|
|
if (!bh)
|
|
return 0;
|
|
tmp = ((unsigned short *) bh->b_data)[nr];
|
|
brelse(bh);
|
|
return tmp;
|
|
}
|
|
|
|
int minix_bmap(struct inode * inode,int block)
|
|
{
|
|
int i;
|
|
|
|
if (block<0) {
|
|
printk("minix_bmap: block<0");
|
|
return 0;
|
|
}
|
|
if (block >= 7+512+512*512) {
|
|
printk("minix_bmap: block>big");
|
|
return 0;
|
|
}
|
|
if (block < 7)
|
|
return inode_bmap(inode,block);
|
|
block -= 7;
|
|
if (block < 512) {
|
|
i = inode_bmap(inode,7);
|
|
if (!i)
|
|
return 0;
|
|
return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
|
|
}
|
|
block -= 512;
|
|
i = inode_bmap(inode,8);
|
|
if (!i)
|
|
return 0;
|
|
i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
|
|
if (!i)
|
|
return 0;
|
|
return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 511);
|
|
}
|
|
|
|
static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
|
|
{
|
|
int tmp;
|
|
unsigned short *p;
|
|
struct buffer_head * result;
|
|
|
|
p = inode->u.minix_i.i_data + nr;
|
|
repeat:
|
|
tmp = *p;
|
|
if (tmp) {
|
|
result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
|
|
if (tmp == *p)
|
|
return result;
|
|
brelse(result);
|
|
goto repeat;
|
|
}
|
|
if (!create)
|
|
return NULL;
|
|
tmp = minix_new_block(inode->i_sb);
|
|
if (!tmp)
|
|
return NULL;
|
|
result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
|
|
if (*p) {
|
|
minix_free_block(inode->i_sb,tmp);
|
|
brelse(result);
|
|
goto repeat;
|
|
}
|
|
*p = tmp;
|
|
inode->i_ctime = CURRENT_TIME;
|
|
inode->i_dirt = 1;
|
|
return result;
|
|
}
|
|
|
|
static struct buffer_head * block_getblk(struct inode * inode,
|
|
struct buffer_head * bh, int nr, int create)
|
|
{
|
|
int tmp;
|
|
unsigned short *p;
|
|
struct buffer_head * result;
|
|
|
|
if (!bh)
|
|
return NULL;
|
|
if (!bh->b_uptodate) {
|
|
ll_rw_block(READ, 1, &bh);
|
|
wait_on_buffer(bh);
|
|
if (!bh->b_uptodate) {
|
|
brelse(bh);
|
|
return NULL;
|
|
}
|
|
}
|
|
p = nr + (unsigned short *) bh->b_data;
|
|
repeat:
|
|
tmp = *p;
|
|
if (tmp) {
|
|
result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
|
|
if (tmp == *p) {
|
|
brelse(bh);
|
|
return result;
|
|
}
|
|
brelse(result);
|
|
goto repeat;
|
|
}
|
|
if (!create) {
|
|
brelse(bh);
|
|
return NULL;
|
|
}
|
|
tmp = minix_new_block(inode->i_sb);
|
|
if (!tmp) {
|
|
brelse(bh);
|
|
return NULL;
|
|
}
|
|
result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
|
|
if (*p) {
|
|
minix_free_block(inode->i_sb,tmp);
|
|
brelse(result);
|
|
goto repeat;
|
|
}
|
|
*p = tmp;
|
|
bh->b_dirt = 1;
|
|
brelse(bh);
|
|
return result;
|
|
}
|
|
|
|
struct buffer_head * minix_getblk(struct inode * inode, int block, int create)
|
|
{
|
|
struct buffer_head * bh;
|
|
|
|
if (block<0) {
|
|
printk("minix_getblk: block<0");
|
|
return NULL;
|
|
}
|
|
if (block >= 7+512+512*512) {
|
|
printk("minix_getblk: block>big");
|
|
return NULL;
|
|
}
|
|
if (block < 7)
|
|
return inode_getblk(inode,block,create);
|
|
block -= 7;
|
|
if (block < 512) {
|
|
bh = inode_getblk(inode,7,create);
|
|
return block_getblk(inode, bh, block, create);
|
|
}
|
|
block -= 512;
|
|
bh = inode_getblk(inode,8,create);
|
|
bh = block_getblk(inode, bh, block>>9, create);
|
|
return block_getblk(inode, bh, block & 511, create);
|
|
}
|
|
|
|
struct buffer_head * minix_bread(struct inode * inode, int block, int create)
|
|
{
|
|
struct buffer_head * bh;
|
|
|
|
bh = minix_getblk(inode,block,create);
|
|
if (!bh || bh->b_uptodate)
|
|
return bh;
|
|
ll_rw_block(READ, 1, &bh);
|
|
wait_on_buffer(bh);
|
|
if (bh->b_uptodate)
|
|
return bh;
|
|
brelse(bh);
|
|
return NULL;
|
|
}
|
|
|
|
void minix_read_inode(struct inode * inode)
|
|
{
|
|
struct buffer_head * bh;
|
|
struct minix_inode * raw_inode;
|
|
int block, ino;
|
|
|
|
ino = inode->i_ino;
|
|
inode->i_op = NULL;
|
|
inode->i_mode = 0;
|
|
if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
|
|
printk("Bad inode number on dev 0x%04x: %d is out of range\n",
|
|
inode->i_dev, ino);
|
|
return;
|
|
}
|
|
block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks +
|
|
inode->i_sb->u.minix_sb.s_zmap_blocks +
|
|
(ino-1)/MINIX_INODES_PER_BLOCK;
|
|
if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE))) {
|
|
printk("Major problem: unable to read inode from dev 0x%04x\n",
|
|
inode->i_dev);
|
|
return;
|
|
}
|
|
raw_inode = ((struct minix_inode *) bh->b_data) +
|
|
(ino-1)%MINIX_INODES_PER_BLOCK;
|
|
inode->i_mode = raw_inode->i_mode;
|
|
inode->i_uid = raw_inode->i_uid;
|
|
inode->i_gid = raw_inode->i_gid;
|
|
inode->i_nlink = raw_inode->i_nlinks;
|
|
inode->i_size = raw_inode->i_size;
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
|
|
inode->i_blocks = inode->i_blksize = 0;
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
inode->i_rdev = raw_inode->i_zone[0];
|
|
else for (block = 0; block < 9; block++)
|
|
inode->u.minix_i.i_data[block] = raw_inode->i_zone[block];
|
|
brelse(bh);
|
|
if (S_ISREG(inode->i_mode))
|
|
inode->i_op = &minix_file_inode_operations;
|
|
else if (S_ISDIR(inode->i_mode))
|
|
inode->i_op = &minix_dir_inode_operations;
|
|
else if (S_ISLNK(inode->i_mode))
|
|
inode->i_op = &minix_symlink_inode_operations;
|
|
else if (S_ISCHR(inode->i_mode))
|
|
inode->i_op = &chrdev_inode_operations;
|
|
else if (S_ISBLK(inode->i_mode))
|
|
inode->i_op = &blkdev_inode_operations;
|
|
else if (S_ISFIFO(inode->i_mode))
|
|
init_fifo(inode);
|
|
}
|
|
|
|
static struct buffer_head * minix_update_inode(struct inode * inode)
|
|
{
|
|
struct buffer_head * bh;
|
|
struct minix_inode * raw_inode;
|
|
int ino, block;
|
|
|
|
ino = inode->i_ino;
|
|
if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
|
|
printk("Bad inode number on dev 0x%04x: %d is out of range\n",
|
|
inode->i_dev, ino);
|
|
inode->i_dirt = 0;
|
|
return 0;
|
|
}
|
|
block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
|
|
(ino-1)/MINIX_INODES_PER_BLOCK;
|
|
if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE))) {
|
|
printk("unable to read i-node block\n");
|
|
inode->i_dirt = 0;
|
|
return 0;
|
|
}
|
|
raw_inode = ((struct minix_inode *)bh->b_data) +
|
|
(ino-1)%MINIX_INODES_PER_BLOCK;
|
|
raw_inode->i_mode = inode->i_mode;
|
|
raw_inode->i_uid = inode->i_uid;
|
|
raw_inode->i_gid = inode->i_gid;
|
|
raw_inode->i_nlinks = inode->i_nlink;
|
|
raw_inode->i_size = inode->i_size;
|
|
raw_inode->i_time = inode->i_mtime;
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
raw_inode->i_zone[0] = inode->i_rdev;
|
|
else for (block = 0; block < 9; block++)
|
|
raw_inode->i_zone[block] = inode->u.minix_i.i_data[block];
|
|
inode->i_dirt=0;
|
|
bh->b_dirt=1;
|
|
return bh;
|
|
}
|
|
|
|
void minix_write_inode(struct inode * inode)
|
|
{
|
|
struct buffer_head *bh;
|
|
bh = minix_update_inode(inode);
|
|
brelse(bh);
|
|
}
|
|
|
|
int minix_sync_inode(struct inode * inode)
|
|
{
|
|
int err = 0;
|
|
struct buffer_head *bh;
|
|
|
|
bh = minix_update_inode(inode);
|
|
if (bh && bh->b_dirt)
|
|
{
|
|
ll_rw_block(WRITE, 1, &bh);
|
|
wait_on_buffer(bh);
|
|
if (bh->b_req && !bh->b_uptodate)
|
|
{
|
|
printk ("IO error syncing minix inode [%04x:%08lx]\n",
|
|
inode->i_dev, inode->i_ino);
|
|
err = -1;
|
|
}
|
|
}
|
|
else if (!bh)
|
|
err = -1;
|
|
brelse (bh);
|
|
return err;
|
|
}
|