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/*
* linux/fs/adfs/inode.c
*
* Copyright (C) 1997 Russell King
*/
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/adfs_fs.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/locks.h>
#include <linux/mm.h>
/*
* Old Inode numbers:
* bit 30 - 16 FragID of parent object
* bit 15 0 1
* bit 14 - 0 FragID of object Offset into parent FragID
*
* New Inode numbers:
* Inode = Frag ID of parent (14) + Frag Offset (8) + (index into directory + 1)(8)
*/
#define inode_frag(ino) ((ino) >> 8)
#define inode_idx(ino) ((ino) & 0xff)
#define inode_dirindex(idx) (((idx) & 0xff) * 26 - 21)
#define frag_id(x) (((x) >> 8) & 0x7fff)
#define off(x) (((x) & 0xff) ? (((x) & 0xff) - 1) << sb->u.adfs_sb.s_dr->log2sharesize : 0)
static inline int adfs_inode_validate_no (struct super_block *sb, unsigned int inode_no)
{
unsigned long max_frag_id;
max_frag_id = sb->u.adfs_sb.s_map_size * sb->u.adfs_sb.s_ids_per_zone;
return (inode_no & 0x800000ff) ||
(frag_id (inode_frag (inode_no)) > max_frag_id) ||
(frag_id (inode_frag (inode_no)) < 2);
}
int adfs_inode_validate (struct inode *inode)
{
struct super_block *sb = inode->i_sb;
return adfs_inode_validate_no (sb, inode->i_ino & 0xffffff00) ||
adfs_inode_validate_no (sb, inode->u.adfs_i.file_id << 8);
}
unsigned long adfs_inode_generate (unsigned long parent_id, int diridx)
{
if (!parent_id)
return -1;
if (diridx)
diridx = (diridx + 21) / 26;
return (parent_id << 8) | diridx;
}
unsigned long adfs_inode_objid (struct inode *inode)
{
if (adfs_inode_validate (inode)) {
adfs_error (inode->i_sb, "adfs_inode_objid",
"bad inode number: %lu (%X,%X)",
inode->i_ino, inode->i_ino, inode->u.adfs_i.file_id);
return 0;
}
return inode->u.adfs_i.file_id;
}
int adfs_bmap (struct inode *inode, int block)
{
struct super_block *sb = inode->i_sb;
unsigned int blk;
if (adfs_inode_validate (inode)) {
adfs_error (sb, "adfs_bmap",
"bad inode number: %lu (%X,%X)",
inode->i_ino, inode->i_ino, inode->u.adfs_i.file_id);
return 0;
}
if (block < 0) {
adfs_error(sb, "adfs_bmap", "block(%d) < 0", block);
return 0;
}
if (block > inode->i_blocks)
return 0;
block += off(inode->u.adfs_i.file_id);
if (frag_id(inode->u.adfs_i.file_id) == ADFS_ROOT_FRAG)
blk = sb->u.adfs_sb.s_map_block + block;
else
blk = adfs_map_lookup (sb, frag_id(inode->u.adfs_i.file_id), block);
return blk;
}
unsigned int adfs_parent_bmap (struct inode *inode, int block)
{
struct super_block *sb = inode->i_sb;
unsigned int blk, fragment;
if (adfs_inode_validate_no (sb, inode->i_ino & 0xffffff00)) {
adfs_error (sb, "adfs_parent_bmap",
"bad inode number: %lu (%X,%X)",
inode->i_ino, inode->i_ino, inode->u.adfs_i.file_id);
return 0;
}
fragment = inode_frag (inode->i_ino);
if (frag_id (fragment) == ADFS_ROOT_FRAG)
blk = sb->u.adfs_sb.s_map_block + off(fragment) + block;
else
blk = adfs_map_lookup (sb, frag_id (fragment), off(fragment) + block);
return blk;
}
static int adfs_atts2mode(struct super_block *sb, unsigned char mode, unsigned int filetype)
{
int omode = 0;
if (filetype == 0xfc0 /* LinkFS */) {
omode = S_IFLNK|S_IRUSR|S_IWUSR|S_IXUSR|
S_IRGRP|S_IWGRP|S_IXGRP|
S_IROTH|S_IWOTH|S_IXOTH;
} else {
if (mode & ADFS_NDA_DIRECTORY) {
omode |= S_IRUGO & sb->u.adfs_sb.s_owner_mask;
omode |= S_IFDIR|S_IXUSR|S_IXGRP|S_IXOTH;
} else
omode |= S_IFREG;
if (mode & ADFS_NDA_OWNER_READ) {
omode |= S_IRUGO & sb->u.adfs_sb.s_owner_mask;
if (filetype == 0xfe6 /* UnixExec */)
omode |= S_IXUGO & sb->u.adfs_sb.s_owner_mask;
}
if (mode & ADFS_NDA_OWNER_WRITE)
omode |= S_IWUGO & sb->u.adfs_sb.s_owner_mask;
if (mode & ADFS_NDA_PUBLIC_READ) {
omode |= S_IRUGO & sb->u.adfs_sb.s_other_mask;
if (filetype == 0xfe6 /* UnixExec */)
omode |= S_IXUGO & sb->u.adfs_sb.s_other_mask;
}
if (mode & ADFS_NDA_PUBLIC_WRITE)
omode |= S_IWUGO & sb->u.adfs_sb.s_other_mask;
}
return omode;
}
void adfs_read_inode (struct inode *inode)
{
struct super_block *sb;
struct buffer_head *bh[4];
struct adfs_idir_entry ide;
int buffers;
sb = inode->i_sb;
inode->i_uid = sb->u.adfs_sb.s_uid;
inode->i_gid = sb->u.adfs_sb.s_gid;
inode->i_version = ++event;
if (adfs_inode_validate_no (sb, inode->i_ino & 0xffffff00)) {
adfs_error (sb, "adfs_read_inode",
"bad inode number: %lu", inode->i_ino);
goto bad;
}
if (frag_id(inode_frag (inode->i_ino)) == ADFS_ROOT_FRAG &&
inode_idx (inode->i_ino) == 0) {
/* root dir */
inode->i_mode = S_IRWXUGO | S_IFDIR;
inode->i_nlink = 2;
inode->i_size = ADFS_NEWDIR_SIZE;
inode->i_blksize = PAGE_SIZE;
inode->i_blocks = inode->i_size / sb->s_blocksize;
inode->i_mtime =
inode->i_atime =
inode->i_ctime = 0;
inode->u.adfs_i.file_id = inode_frag (inode->i_ino);
} else {
if (!(buffers = adfs_dir_read_parent (inode, bh)))
goto bad;
if (adfs_dir_check (inode, bh, buffers, NULL)) {
adfs_dir_free (bh, buffers);
goto bad;
}
if (!adfs_dir_find_entry (sb, bh, buffers, inode_dirindex (inode->i_ino), &ide)) {
adfs_dir_free (bh, buffers);
goto bad;
}
adfs_dir_free (bh, buffers);
inode->i_mode = adfs_atts2mode(sb, ide.mode, ide.filetype);
inode->i_nlink = 2;
inode->i_size = ide.size;
inode->i_blksize = PAGE_SIZE;
inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
inode->i_mtime =
inode->i_atime =
inode->i_ctime = ide.mtime;
inode->u.adfs_i.file_id = ide.file_id;
}
if (S_ISDIR(inode->i_mode))
inode->i_op = &adfs_dir_inode_operations;
else if (S_ISREG(inode->i_mode))
inode->i_op = &adfs_file_inode_operations;
return;
bad:
make_bad_inode(inode);
}
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