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/*
* fs/bfs/inode.c
* BFS superblock and inode operations.
* Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
* From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
*/
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/locks.h>
#include <linux/bfs_fs.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include "bfs_defs.h"
MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
#undef DEBUG
#ifdef DEBUG
#define dprintf(x...) printf(x)
#else
#define dprintf(x...)
#endif
void dump_imap(const char *prefix, struct super_block * s);
static void bfs_read_inode(struct inode * inode)
{
unsigned long ino = inode->i_ino;
kdev_t dev = inode->i_dev;
struct bfs_inode * di;
struct buffer_head * bh;
int block, off;
if (ino < BFS_ROOT_INO || ino > inode->i_sb->su_lasti) {
printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
make_bad_inode(inode);
return;
}
block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
bh = sb_bread(inode->i_sb, block);
if (!bh) {
printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
make_bad_inode(inode);
return;
}
off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
di = (struct bfs_inode *)bh->b_data + off;
inode->i_mode = 0x0000FFFF & di->i_mode;
if (di->i_vtype == BFS_VDIR) {
inode->i_mode |= S_IFDIR;
inode->i_op = &bfs_dir_inops;
inode->i_fop = &bfs_dir_operations;
} else if (di->i_vtype == BFS_VREG) {
inode->i_mode |= S_IFREG;
inode->i_op = &bfs_file_inops;
inode->i_fop = &bfs_file_operations;
inode->i_mapping->a_ops = &bfs_aops;
}
inode->i_uid = di->i_uid;
inode->i_gid = di->i_gid;
inode->i_nlink = di->i_nlink;
inode->i_size = BFS_FILESIZE(di);
inode->i_blocks = BFS_FILEBLOCKS(di);
inode->i_blksize = PAGE_SIZE;
inode->i_atime = di->i_atime;
inode->i_mtime = di->i_mtime;
inode->i_ctime = di->i_ctime;
inode->iu_dsk_ino = di->i_ino; /* can be 0 so we store a copy */
inode->iu_sblock = di->i_sblock;
inode->iu_eblock = di->i_eblock;
brelse(bh);
}
static void bfs_write_inode(struct inode * inode, int unused)
{
unsigned long ino = inode->i_ino;
kdev_t dev = inode->i_dev;
struct bfs_inode * di;
struct buffer_head * bh;
int block, off;
if (ino < BFS_ROOT_INO || ino > inode->i_sb->su_lasti) {
printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
return;
}
lock_kernel();
block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
bh = sb_bread(inode->i_sb, block);
if (!bh) {
printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
unlock_kernel();
return;
}
off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
di = (struct bfs_inode *)bh->b_data + off;
if (inode->i_ino == BFS_ROOT_INO)
di->i_vtype = BFS_VDIR;
else
di->i_vtype = BFS_VREG;
di->i_ino = inode->i_ino;
di->i_mode = inode->i_mode;
di->i_uid = inode->i_uid;
di->i_gid = inode->i_gid;
di->i_nlink = inode->i_nlink;
di->i_atime = inode->i_atime;
di->i_mtime = inode->i_mtime;
di->i_ctime = inode->i_ctime;
di->i_sblock = inode->iu_sblock;
di->i_eblock = inode->iu_eblock;
di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1;
mark_buffer_dirty(bh);
brelse(bh);
unlock_kernel();
}
static void bfs_delete_inode(struct inode * inode)
{
unsigned long ino = inode->i_ino;
kdev_t dev = inode->i_dev;
struct bfs_inode * di;
struct buffer_head * bh;
int block, off;
struct super_block * s = inode->i_sb;
dprintf("ino=%08lx\n", inode->i_ino);
if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > inode->i_sb->su_lasti) {
printf("invalid ino=%08lx\n", inode->i_ino);
return;
}
inode->i_size = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
lock_kernel();
mark_inode_dirty(inode);
block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
bh = sb_bread(s, block);
if (!bh) {
printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
unlock_kernel();
return;
}
off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
di = (struct bfs_inode *)bh->b_data + off;
if (di->i_ino) {
s->su_freeb += BFS_FILEBLOCKS(di);
s->su_freei++;
clear_bit(di->i_ino, s->su_imap);
dump_imap("delete_inode", s);
}
di->i_ino = 0;
di->i_sblock = 0;
mark_buffer_dirty(bh);
brelse(bh);
/* if this was the last file, make the previous
block "last files last block" even if there is no real file there,
saves us 1 gap */
if (s->su_lf_eblk == inode->iu_eblock) {
s->su_lf_eblk = inode->iu_sblock - 1;
mark_buffer_dirty(s->su_sbh);
}
unlock_kernel();
clear_inode(inode);
}
static void bfs_put_super(struct super_block *s)
{
brelse(s->su_sbh);
kfree(s->su_imap);
}
static int bfs_statfs(struct super_block *s, struct statfs *buf)
{
buf->f_type = BFS_MAGIC;
buf->f_bsize = s->s_blocksize;
buf->f_blocks = s->su_blocks;
buf->f_bfree = buf->f_bavail = s->su_freeb;
buf->f_files = s->su_lasti + 1 - BFS_ROOT_INO;
buf->f_ffree = s->su_freei;
buf->f_fsid.val[0] = kdev_t_to_nr(s->s_dev);
buf->f_namelen = BFS_NAMELEN;
return 0;
}
static void bfs_write_super(struct super_block *s)
{
if (!(s->s_flags & MS_RDONLY))
mark_buffer_dirty(s->su_sbh);
s->s_dirt = 0;
}
static struct super_operations bfs_sops = {
read_inode: bfs_read_inode,
write_inode: bfs_write_inode,
delete_inode: bfs_delete_inode,
put_super: bfs_put_super,
write_super: bfs_write_super,
statfs: bfs_statfs,
};
void dump_imap(const char *prefix, struct super_block * s)
{
#if 0
int i;
char *tmpbuf = (char *)get_free_page(GFP_KERNEL);
if (!tmpbuf)
return;
for (i=s->su_lasti; i>=0; i--) {
if (i>PAGE_SIZE-100) break;
if (test_bit(i, s->su_imap))
strcat(tmpbuf, "1");
else
strcat(tmpbuf, "0");
}
printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, s->su_lasti, tmpbuf);
free_page((unsigned long)tmpbuf);
#endif
}
static struct super_block * bfs_read_super(struct super_block * s,
void * data, int silent)
{
kdev_t dev;
struct buffer_head * bh;
struct bfs_super_block * bfs_sb;
struct inode * inode;
int i, imap_len;
dev = s->s_dev;
set_blocksize(dev, BFS_BSIZE);
s->s_blocksize = BFS_BSIZE;
s->s_blocksize_bits = BFS_BSIZE_BITS;
bh = sb_bread(s, 0);
if(!bh)
goto out;
bfs_sb = (struct bfs_super_block *)bh->b_data;
if (bfs_sb->s_magic != BFS_MAGIC) {
if (!silent)
printf("No BFS filesystem on %s (magic=%08x)\n",
bdevname(dev), bfs_sb->s_magic);
goto out;
}
if (BFS_UNCLEAN(bfs_sb, s) && !silent)
printf("%s is unclean, continuing\n", bdevname(dev));
s->s_magic = BFS_MAGIC;
s->su_bfs_sb = bfs_sb;
s->su_sbh = bh;
s->su_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode)
+ BFS_ROOT_INO - 1;
imap_len = s->su_lasti/8 + 1;
s->su_imap = kmalloc(imap_len, GFP_KERNEL);
if (!s->su_imap)
goto out;
memset(s->su_imap, 0, imap_len);
for (i=0; i<BFS_ROOT_INO; i++)
set_bit(i, s->su_imap);
s->s_op = &bfs_sops;
inode = iget(s, BFS_ROOT_INO);
if (!inode) {
kfree(s->su_imap);
goto out;
}
s->s_root = d_alloc_root(inode);
if (!s->s_root) {
iput(inode);
kfree(s->su_imap);
goto out;
}
s->su_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
s->su_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS;
s->su_freei = 0;
s->su_lf_eblk = 0;
s->su_lf_sblk = 0;
s->su_lf_ioff = 0;
for (i=BFS_ROOT_INO; i<=s->su_lasti; i++) {
inode = iget(s,i);
if (inode->iu_dsk_ino == 0)
s->su_freei++;
else {
set_bit(i, s->su_imap);
s->su_freeb -= inode->i_blocks;
if (inode->iu_eblock > s->su_lf_eblk) {
s->su_lf_eblk = inode->iu_eblock;
s->su_lf_sblk = inode->iu_sblock;
s->su_lf_ioff = BFS_INO2OFF(i);
}
}
iput(inode);
}
if (!(s->s_flags & MS_RDONLY)) {
mark_buffer_dirty(bh);
s->s_dirt = 1;
}
dump_imap("read_super", s);
return s;
out:
brelse(bh);
return NULL;
}
static DECLARE_FSTYPE_DEV(bfs_fs_type, "bfs", bfs_read_super);
static int __init init_bfs_fs(void)
{
return register_filesystem(&bfs_fs_type);
}
static void __exit exit_bfs_fs(void)
{
unregister_filesystem(&bfs_fs_type);
}
module_init(init_bfs_fs)
module_exit(exit_bfs_fs)
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