![Al Viro](/assets/img/avatar_default.png)
BFS_FILEBLOCKS() expects struct bfs_inode * (on-disk data, with little-
endian fields), not struct bfs_inode_info * (in-core stuff, with host-
endian ones).
It's a macro and fields with the right names are present in
bfs_inode_info, so it compiles, but on big-endian host it gives bogus
results.
Introduced in commit f433dc5634
("Fixes to
the BFS filesystem driver").
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
447 lines
11 KiB
C
447 lines
11 KiB
C
/*
|
|
* fs/bfs/inode.c
|
|
* BFS superblock and inode operations.
|
|
* Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
|
|
* From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
|
|
*
|
|
* Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/vfs.h>
|
|
#include <asm/uaccess.h>
|
|
#include "bfs.h"
|
|
|
|
MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
|
|
MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#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;
|
|
struct bfs_inode *di;
|
|
struct buffer_head *bh;
|
|
int block, off;
|
|
|
|
if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
|
|
printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, 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", inode->i_sb->s_id,
|
|
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 & le32_to_cpu(di->i_mode);
|
|
if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
|
|
inode->i_mode |= S_IFDIR;
|
|
inode->i_op = &bfs_dir_inops;
|
|
inode->i_fop = &bfs_dir_operations;
|
|
} else if (le32_to_cpu(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;
|
|
}
|
|
|
|
BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
|
|
BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
|
|
BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
|
|
inode->i_uid = le32_to_cpu(di->i_uid);
|
|
inode->i_gid = le32_to_cpu(di->i_gid);
|
|
inode->i_nlink = le32_to_cpu(di->i_nlink);
|
|
inode->i_size = BFS_FILESIZE(di);
|
|
inode->i_blocks = BFS_FILEBLOCKS(di);
|
|
inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
|
|
inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
|
|
inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_mtime.tv_nsec = 0;
|
|
inode->i_ctime.tv_nsec = 0;
|
|
|
|
brelse(bh);
|
|
}
|
|
|
|
static int bfs_write_inode(struct inode *inode, int unused)
|
|
{
|
|
unsigned int ino = (u16)inode->i_ino;
|
|
unsigned long i_sblock;
|
|
struct bfs_inode *di;
|
|
struct buffer_head *bh;
|
|
int block, off;
|
|
|
|
dprintf("ino=%08x\n", ino);
|
|
|
|
if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
|
|
printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
|
|
return -EIO;
|
|
}
|
|
|
|
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:%08x\n",
|
|
inode->i_sb->s_id, ino);
|
|
unlock_kernel();
|
|
return -EIO;
|
|
}
|
|
|
|
off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
|
|
di = (struct bfs_inode *)bh->b_data + off;
|
|
|
|
if (ino == BFS_ROOT_INO)
|
|
di->i_vtype = cpu_to_le32(BFS_VDIR);
|
|
else
|
|
di->i_vtype = cpu_to_le32(BFS_VREG);
|
|
|
|
di->i_ino = cpu_to_le16(ino);
|
|
di->i_mode = cpu_to_le32(inode->i_mode);
|
|
di->i_uid = cpu_to_le32(inode->i_uid);
|
|
di->i_gid = cpu_to_le32(inode->i_gid);
|
|
di->i_nlink = cpu_to_le32(inode->i_nlink);
|
|
di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
|
|
di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
|
|
di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
|
|
i_sblock = BFS_I(inode)->i_sblock;
|
|
di->i_sblock = cpu_to_le32(i_sblock);
|
|
di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
|
|
di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
|
|
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
|
|
static void bfs_delete_inode(struct inode *inode)
|
|
{
|
|
unsigned long ino = inode->i_ino;
|
|
struct bfs_inode *di;
|
|
struct buffer_head *bh;
|
|
int block, off;
|
|
struct super_block *s = inode->i_sb;
|
|
struct bfs_sb_info *info = BFS_SB(s);
|
|
struct bfs_inode_info *bi = BFS_I(inode);
|
|
|
|
dprintf("ino=%08lx\n", ino);
|
|
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
|
|
if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
|
|
printf("invalid ino=%08lx\n", ino);
|
|
return;
|
|
}
|
|
|
|
inode->i_size = 0;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
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",
|
|
inode->i_sb->s_id, ino);
|
|
unlock_kernel();
|
|
return;
|
|
}
|
|
off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
|
|
di = (struct bfs_inode *)bh->b_data + off;
|
|
memset((void *)di, 0, sizeof(struct bfs_inode));
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
|
|
if (bi->i_dsk_ino) {
|
|
if (bi->i_sblock)
|
|
info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
|
|
info->si_freei++;
|
|
clear_bit(ino, info->si_imap);
|
|
dump_imap("delete_inode", s);
|
|
}
|
|
|
|
/*
|
|
* If this was the last file, make the previous block
|
|
* "last block of the last file" even if there is no
|
|
* real file there, saves us 1 gap.
|
|
*/
|
|
if (info->si_lf_eblk == bi->i_eblock) {
|
|
info->si_lf_eblk = bi->i_sblock - 1;
|
|
mark_buffer_dirty(info->si_sbh);
|
|
}
|
|
unlock_kernel();
|
|
clear_inode(inode);
|
|
}
|
|
|
|
static void bfs_put_super(struct super_block *s)
|
|
{
|
|
struct bfs_sb_info *info = BFS_SB(s);
|
|
brelse(info->si_sbh);
|
|
kfree(info->si_imap);
|
|
kfree(info);
|
|
s->s_fs_info = NULL;
|
|
}
|
|
|
|
static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *s = dentry->d_sb;
|
|
struct bfs_sb_info *info = BFS_SB(s);
|
|
u64 id = huge_encode_dev(s->s_bdev->bd_dev);
|
|
buf->f_type = BFS_MAGIC;
|
|
buf->f_bsize = s->s_blocksize;
|
|
buf->f_blocks = info->si_blocks;
|
|
buf->f_bfree = buf->f_bavail = info->si_freeb;
|
|
buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
|
|
buf->f_ffree = info->si_freei;
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
buf->f_namelen = BFS_NAMELEN;
|
|
return 0;
|
|
}
|
|
|
|
static void bfs_write_super(struct super_block *s)
|
|
{
|
|
lock_kernel();
|
|
if (!(s->s_flags & MS_RDONLY))
|
|
mark_buffer_dirty(BFS_SB(s)->si_sbh);
|
|
s->s_dirt = 0;
|
|
unlock_kernel();
|
|
}
|
|
|
|
static struct kmem_cache *bfs_inode_cachep;
|
|
|
|
static struct inode *bfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct bfs_inode_info *bi;
|
|
bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
|
|
if (!bi)
|
|
return NULL;
|
|
return &bi->vfs_inode;
|
|
}
|
|
|
|
static void bfs_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
|
|
}
|
|
|
|
static void init_once(struct kmem_cache *cachep, void *foo)
|
|
{
|
|
struct bfs_inode_info *bi = foo;
|
|
|
|
inode_init_once(&bi->vfs_inode);
|
|
}
|
|
|
|
static int init_inodecache(void)
|
|
{
|
|
bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
|
|
sizeof(struct bfs_inode_info),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
init_once);
|
|
if (bfs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(bfs_inode_cachep);
|
|
}
|
|
|
|
static const struct super_operations bfs_sops = {
|
|
.alloc_inode = bfs_alloc_inode,
|
|
.destroy_inode = bfs_destroy_inode,
|
|
.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)
|
|
{
|
|
#ifdef DEBUG
|
|
int i;
|
|
char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!tmpbuf)
|
|
return;
|
|
for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
|
|
if (i > PAGE_SIZE - 100) break;
|
|
if (test_bit(i, BFS_SB(s)->si_imap))
|
|
strcat(tmpbuf, "1");
|
|
else
|
|
strcat(tmpbuf, "0");
|
|
}
|
|
printf("BFS-fs: %s: lasti=%08lx <%s>\n",
|
|
prefix, BFS_SB(s)->si_lasti, tmpbuf);
|
|
free_page((unsigned long)tmpbuf);
|
|
#endif
|
|
}
|
|
|
|
static int bfs_fill_super(struct super_block *s, void *data, int silent)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct bfs_super_block *bfs_sb;
|
|
struct inode *inode;
|
|
unsigned i, imap_len;
|
|
struct bfs_sb_info *info;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
s->s_fs_info = info;
|
|
|
|
sb_set_blocksize(s, BFS_BSIZE);
|
|
|
|
bh = sb_bread(s, 0);
|
|
if(!bh)
|
|
goto out;
|
|
bfs_sb = (struct bfs_super_block *)bh->b_data;
|
|
if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
|
|
if (!silent)
|
|
printf("No BFS filesystem on %s (magic=%08x)\n",
|
|
s->s_id, le32_to_cpu(bfs_sb->s_magic));
|
|
goto out;
|
|
}
|
|
if (BFS_UNCLEAN(bfs_sb, s) && !silent)
|
|
printf("%s is unclean, continuing\n", s->s_id);
|
|
|
|
s->s_magic = BFS_MAGIC;
|
|
info->si_sbh = bh;
|
|
info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
|
|
sizeof(struct bfs_inode)
|
|
+ BFS_ROOT_INO - 1;
|
|
imap_len = (info->si_lasti / 8) + 1;
|
|
info->si_imap = kzalloc(imap_len, GFP_KERNEL);
|
|
if (!info->si_imap)
|
|
goto out;
|
|
for (i = 0; i < BFS_ROOT_INO; i++)
|
|
set_bit(i, info->si_imap);
|
|
|
|
s->s_op = &bfs_sops;
|
|
inode = iget(s, BFS_ROOT_INO);
|
|
if (!inode) {
|
|
kfree(info->si_imap);
|
|
goto out;
|
|
}
|
|
s->s_root = d_alloc_root(inode);
|
|
if (!s->s_root) {
|
|
iput(inode);
|
|
kfree(info->si_imap);
|
|
goto out;
|
|
}
|
|
|
|
info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
|
|
info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
|
|
- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
|
|
info->si_freei = 0;
|
|
info->si_lf_eblk = 0;
|
|
bh = NULL;
|
|
for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
|
|
struct bfs_inode *di;
|
|
int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
|
|
int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
|
|
unsigned long sblock, eblock;
|
|
|
|
if (!off) {
|
|
brelse(bh);
|
|
bh = sb_bread(s, block);
|
|
}
|
|
|
|
if (!bh)
|
|
continue;
|
|
|
|
di = (struct bfs_inode *)bh->b_data + off;
|
|
|
|
if (!di->i_ino) {
|
|
info->si_freei++;
|
|
continue;
|
|
}
|
|
set_bit(i, info->si_imap);
|
|
info->si_freeb -= BFS_FILEBLOCKS(di);
|
|
|
|
sblock = le32_to_cpu(di->i_sblock);
|
|
eblock = le32_to_cpu(di->i_eblock);
|
|
if (eblock > info->si_lf_eblk)
|
|
info->si_lf_eblk = eblock;
|
|
}
|
|
brelse(bh);
|
|
if (!(s->s_flags & MS_RDONLY)) {
|
|
mark_buffer_dirty(info->si_sbh);
|
|
s->s_dirt = 1;
|
|
}
|
|
dump_imap("read_super", s);
|
|
return 0;
|
|
|
|
out:
|
|
brelse(bh);
|
|
kfree(info);
|
|
s->s_fs_info = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bfs_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type bfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "bfs",
|
|
.get_sb = bfs_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_bfs_fs(void)
|
|
{
|
|
int err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&bfs_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_bfs_fs(void)
|
|
{
|
|
unregister_filesystem(&bfs_fs_type);
|
|
destroy_inodecache();
|
|
}
|
|
|
|
module_init(init_bfs_fs)
|
|
module_exit(exit_bfs_fs)
|