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/*
* linux/fs/affs/inode.c
*
* (c) 1996 Hans-Joachim Widmaier - Rewritten
*
* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
*
* (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
*
* (C) 1991 Linus Torvalds - minix filesystem
*/
#include <asm/div64.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/affs_fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/locks.h>
#include <linux/genhd.h>
#include <linux/amigaffs.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/module.h>
extern struct inode_operations affs_symlink_inode_operations;
extern struct timezone sys_tz;
void
affs_read_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct buffer_head *bh;
struct affs_head *head;
struct affs_tail *tail;
u32 block;
u32 size;
u32 prot;
u16 id;
pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
block = inode->i_ino;
bh = affs_bread(sb, block);
if (!bh) {
affs_warning(sb, "read_inode", "Cannot read block %d", block);
goto bad_inode;
}
if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
affs_warning(sb,"read_inode",
"Checksum or type (ptype=%d) error on inode %d",
AFFS_HEAD(bh)->ptype, block);
goto bad_inode;
}
head = AFFS_HEAD(bh);
tail = AFFS_TAIL(sb, bh);
prot = be32_to_cpu(tail->protect);
inode->i_size = 0;
inode->i_nlink = 1;
inode->i_mode = 0;
memset(AFFS_INODE, 0, sizeof(*AFFS_INODE));
init_MUTEX(&AFFS_INODE->i_link_lock);
init_MUTEX(&AFFS_INODE->i_ext_lock);
AFFS_INODE->i_extcnt = 1;
AFFS_INODE->i_ext_last = ~1;
AFFS_INODE->i_protect = prot;
if (AFFS_SB->s_flags & SF_SETMODE)
inode->i_mode = AFFS_SB->s_mode;
else
inode->i_mode = prot_to_mode(prot);
id = be16_to_cpu(tail->uid);
if (id == 0 || AFFS_SB->s_flags & SF_SETUID)
inode->i_uid = AFFS_SB->s_uid;
else if (id == 0xFFFF && AFFS_SB->s_flags & SF_MUFS)
inode->i_uid = 0;
else
inode->i_uid = id;
id = be16_to_cpu(tail->gid);
if (id == 0 || AFFS_SB->s_flags & SF_SETGID)
inode->i_gid = AFFS_SB->s_gid;
else if (id == 0xFFFF && AFFS_SB->s_flags & SF_MUFS)
inode->i_gid = 0;
else
inode->i_gid = id;
switch (be32_to_cpu(tail->stype)) {
case ST_ROOT:
inode->i_uid = AFFS_SB->s_uid;
inode->i_gid = AFFS_SB->s_gid;
/* fall through */
case ST_USERDIR:
if (be32_to_cpu(tail->stype) == ST_USERDIR ||
AFFS_SB->s_flags & SF_SETMODE) {
if (inode->i_mode & S_IRUSR)
inode->i_mode |= S_IXUSR;
if (inode->i_mode & S_IRGRP)
inode->i_mode |= S_IXGRP;
if (inode->i_mode & S_IROTH)
inode->i_mode |= S_IXOTH;
inode->i_mode |= S_IFDIR;
} else
inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
if (tail->link_chain)
inode->i_nlink = 2;
/* Maybe it should be controlled by mount parameter? */
//inode->i_mode |= S_ISVTX;
inode->i_op = &affs_dir_inode_operations;
inode->i_fop = &affs_dir_operations;
break;
case ST_LINKDIR:
#if 0
affs_warning(sb, "read_inode", "inode is LINKDIR");
goto bad_inode;
#else
inode->i_mode |= S_IFDIR;
inode->i_op = NULL;
inode->i_fop = NULL;
break;
#endif
case ST_LINKFILE:
affs_warning(sb, "read_inode", "inode is LINKFILE");
goto bad_inode;
case ST_FILE:
size = be32_to_cpu(tail->size);
inode->i_mode |= S_IFREG;
AFFS_INODE->mmu_private = inode->i_size = size;
if (inode->i_size) {
AFFS_INODE->i_blkcnt = (size - 1) /
AFFS_SB->s_data_blksize + 1;
AFFS_INODE->i_extcnt = (AFFS_INODE->i_blkcnt - 1) /
AFFS_SB->s_hashsize + 1;
}
if (tail->link_chain)
inode->i_nlink = 2;
inode->i_mapping->a_ops = (AFFS_SB->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
inode->i_op = &affs_file_inode_operations;
inode->i_fop = &affs_file_operations;
break;
case ST_SOFTLINK:
inode->i_mode |= S_IFLNK;
inode->i_op = &affs_symlink_inode_operations;
inode->i_data.a_ops = &affs_symlink_aops;
break;
}
inode->i_mtime = inode->i_atime = inode->i_ctime
= (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
be32_to_cpu(tail->change.mins) * 60 +
be32_to_cpu(tail->change.ticks) / 50 +
((8 * 365 + 2) * 24 * 60 * 60)) +
sys_tz.tz_minuteswest * 60;
affs_brelse(bh);
return;
bad_inode:
make_bad_inode(inode);
affs_brelse(bh);
return;
}
void
affs_write_inode(struct inode *inode, int unused)
{
struct super_block *sb = inode->i_sb;
struct buffer_head *bh;
struct affs_tail *tail;
uid_t uid;
gid_t gid;
pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
if (!inode->i_nlink)
// possibly free block
return;
lock_kernel();
bh = affs_bread(sb, inode->i_ino);
if (!bh) {
affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
unlock_kernel();
return;
}
tail = AFFS_TAIL(sb, bh);
if (tail->stype == be32_to_cpu(ST_ROOT)) {
secs_to_datestamp(inode->i_mtime,&AFFS_ROOT_TAIL(sb, bh)->root_change);
} else {
tail->protect = cpu_to_be32(AFFS_INODE->i_protect);
tail->size = cpu_to_be32(inode->i_size);
secs_to_datestamp(inode->i_mtime,&tail->change);
if (!(inode->i_ino == AFFS_SB->s_root_block)) {
uid = inode->i_uid;
gid = inode->i_gid;
if (sb->u.affs_sb.s_flags & SF_MUFS) {
if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
uid = inode->i_uid ^ ~0;
if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
gid = inode->i_gid ^ ~0;
}
if (!(sb->u.affs_sb.s_flags & SF_SETUID))
tail->uid = cpu_to_be16(uid);
if (!(sb->u.affs_sb.s_flags & SF_SETGID))
tail->gid = cpu_to_be16(gid);
}
}
affs_fix_checksum(sb, bh);
mark_buffer_dirty_inode(bh, inode);
affs_brelse(bh);
unlock_kernel();
}
int
affs_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
int error;
pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
error = inode_change_ok(inode,attr);
if (error)
goto out;
if (((attr->ia_valid & ATTR_UID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)) ||
((attr->ia_valid & ATTR_GID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETGID)) ||
((attr->ia_valid & ATTR_MODE) &&
(inode->i_sb->u.affs_sb.s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
if (!(inode->i_sb->u.affs_sb.s_flags & SF_QUIET))
error = -EPERM;
goto out;
}
inode_setattr(inode, attr);
if (!error && (attr->ia_valid & ATTR_MODE))
mode_to_prot(inode);
out:
return error;
}
void
affs_put_inode(struct inode *inode)
{
pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
lock_kernel();
affs_free_prealloc(inode);
if (atomic_read(&inode->i_count) == 1) {
if (inode->i_size != AFFS_INODE->mmu_private)
affs_truncate(inode);
//if (inode->i_nlink)
// affs_clear_inode(inode);
}
unlock_kernel();
}
void
affs_delete_inode(struct inode *inode)
{
pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
lock_kernel();
inode->i_size = 0;
if (S_ISREG(inode->i_mode))
affs_truncate(inode);
clear_inode(inode);
affs_free_block(inode->i_sb, inode->i_ino);
unlock_kernel();
}
void
affs_clear_inode(struct inode *inode)
{
unsigned long cache_page = (unsigned long) inode->u.affs_i.i_lc;
pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
if (cache_page) {
pr_debug("AFFS: freeing ext cache\n");
inode->u.affs_i.i_lc = NULL;
inode->u.affs_i.i_ac = NULL;
free_page(cache_page);
}
affs_brelse(AFFS_INODE->i_ext_bh);
AFFS_INODE->i_ext_last = ~1;
AFFS_INODE->i_ext_bh = NULL;
}
struct inode *
affs_new_inode(struct inode *dir)
{
struct super_block *sb = dir->i_sb;
struct inode *inode;
u32 block;
struct buffer_head *bh;
if (!(inode = new_inode(sb)))
goto err_inode;
if (!(block = affs_alloc_block(dir, dir->i_ino)))
goto err_block;
bh = affs_getzeroblk(sb, block);
if (!bh)
goto err_bh;
mark_buffer_dirty_inode(bh, inode);
affs_brelse(bh);
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_ino = block;
inode->i_nlink = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
memset(AFFS_INODE, 0, sizeof(*AFFS_INODE));
AFFS_INODE->i_extcnt = 1;
AFFS_INODE->i_ext_last = ~1;
init_MUTEX(&AFFS_INODE->i_link_lock);
init_MUTEX(&AFFS_INODE->i_ext_lock);
insert_inode_hash(inode);
return inode;
err_bh:
affs_free_block(sb, block);
err_block:
iput(inode);
err_inode:
return NULL;
}
/*
* Add an entry to a directory. Create the header block
* and insert it into the hash table.
*/
int
affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
{
struct super_block *sb = dir->i_sb;
struct buffer_head *inode_bh = NULL;
struct buffer_head *bh = NULL;
u32 block = 0;
int retval;
pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
(u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
retval = -EIO;
bh = affs_bread(sb, inode->i_ino);
if (!bh)
goto done;
affs_lock_link(inode);
switch (type) {
case ST_LINKFILE:
case ST_LINKDIR:
inode_bh = bh;
retval = -ENOSPC;
block = affs_alloc_block(dir, dir->i_ino);
if (!block)
goto err;
retval = -EIO;
bh = affs_getzeroblk(sb, block);
if (!bh)
goto err;
break;
default:
break;
}
AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
if (inode_bh) {
u32 chain;
chain = AFFS_TAIL(sb, inode_bh)->link_chain;
AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
AFFS_TAIL(sb, bh)->link_chain = chain;
AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
mark_buffer_dirty_inode(inode_bh, inode);
inode->i_nlink = 2;
atomic_inc(&inode->i_count);
}
affs_fix_checksum(sb, bh);
mark_buffer_dirty_inode(bh, inode);
dentry->d_fsdata = (void *)bh->b_blocknr;
affs_lock_dir(dir);
retval = affs_insert_hash(dir, bh);
mark_buffer_dirty_inode(bh, inode);
affs_unlock_dir(dir);
affs_unlock_link(inode);
d_instantiate(dentry, inode);
done:
affs_brelse(inode_bh);
affs_brelse(bh);
return retval;
err:
if (block)
affs_free_block(sb, block);
affs_unlock_link(inode);
goto done;
}
MODULE_LICENSE("GPL");
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