You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
361 lines
9.2 KiB
361 lines
9.2 KiB
/*
|
|
* linux/fs/sysv/inode.c
|
|
*
|
|
* minix/inode.c
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* xenix/inode.c
|
|
* Copyright (C) 1992 Doug Evans
|
|
*
|
|
* coh/inode.c
|
|
* Copyright (C) 1993 Pascal Haible, Bruno Haible
|
|
*
|
|
* sysv/inode.c
|
|
* Copyright (C) 1993 Paul B. Monday
|
|
*
|
|
* sysv/inode.c
|
|
* Copyright (C) 1993 Bruno Haible
|
|
* Copyright (C) 1997, 1998 Krzysztof G. Baranowski
|
|
*
|
|
* This file contains code for allocating/freeing inodes and for read/writing
|
|
* the superblock.
|
|
*/
|
|
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/highuid.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/vfs.h>
|
|
#include <asm/byteorder.h>
|
|
#include "sysv.h"
|
|
|
|
/* This is only called on sync() and umount(), when s_dirt=1. */
|
|
static void sysv_write_super(struct super_block *sb)
|
|
{
|
|
struct sysv_sb_info *sbi = SYSV_SB(sb);
|
|
unsigned long time = get_seconds(), old_time;
|
|
|
|
lock_kernel();
|
|
if (sb->s_flags & MS_RDONLY)
|
|
goto clean;
|
|
|
|
/*
|
|
* If we are going to write out the super block,
|
|
* then attach current time stamp.
|
|
* But if the filesystem was marked clean, keep it clean.
|
|
*/
|
|
old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
|
|
if (sbi->s_type == FSTYPE_SYSV4) {
|
|
if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
|
|
*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
|
|
*sbi->s_sb_time = cpu_to_fs32(sbi, time);
|
|
mark_buffer_dirty(sbi->s_bh2);
|
|
}
|
|
clean:
|
|
sb->s_dirt = 0;
|
|
unlock_kernel();
|
|
}
|
|
|
|
static int sysv_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct sysv_sb_info *sbi = SYSV_SB(sb);
|
|
if (sbi->s_forced_ro)
|
|
*flags |= MS_RDONLY;
|
|
if (!(*flags & MS_RDONLY))
|
|
sb->s_dirt = 1;
|
|
return 0;
|
|
}
|
|
|
|
static void sysv_put_super(struct super_block *sb)
|
|
{
|
|
struct sysv_sb_info *sbi = SYSV_SB(sb);
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
/* XXX ext2 also updates the state here */
|
|
mark_buffer_dirty(sbi->s_bh1);
|
|
if (sbi->s_bh1 != sbi->s_bh2)
|
|
mark_buffer_dirty(sbi->s_bh2);
|
|
}
|
|
|
|
brelse(sbi->s_bh1);
|
|
if (sbi->s_bh1 != sbi->s_bh2)
|
|
brelse(sbi->s_bh2);
|
|
|
|
kfree(sbi);
|
|
}
|
|
|
|
static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct sysv_sb_info *sbi = SYSV_SB(sb);
|
|
|
|
buf->f_type = sb->s_magic;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = sbi->s_ndatazones;
|
|
buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
|
|
buf->f_files = sbi->s_ninodes;
|
|
buf->f_ffree = sysv_count_free_inodes(sb);
|
|
buf->f_namelen = SYSV_NAMELEN;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
|
|
*/
|
|
static inline void read3byte(struct sysv_sb_info *sbi,
|
|
unsigned char * from, unsigned char * to)
|
|
{
|
|
if (sbi->s_bytesex == BYTESEX_PDP) {
|
|
to[0] = from[0];
|
|
to[1] = 0;
|
|
to[2] = from[1];
|
|
to[3] = from[2];
|
|
} else if (sbi->s_bytesex == BYTESEX_LE) {
|
|
to[0] = from[0];
|
|
to[1] = from[1];
|
|
to[2] = from[2];
|
|
to[3] = 0;
|
|
} else {
|
|
to[0] = 0;
|
|
to[1] = from[0];
|
|
to[2] = from[1];
|
|
to[3] = from[2];
|
|
}
|
|
}
|
|
|
|
static inline void write3byte(struct sysv_sb_info *sbi,
|
|
unsigned char * from, unsigned char * to)
|
|
{
|
|
if (sbi->s_bytesex == BYTESEX_PDP) {
|
|
to[0] = from[0];
|
|
to[1] = from[2];
|
|
to[2] = from[3];
|
|
} else if (sbi->s_bytesex == BYTESEX_LE) {
|
|
to[0] = from[0];
|
|
to[1] = from[1];
|
|
to[2] = from[2];
|
|
} else {
|
|
to[0] = from[1];
|
|
to[1] = from[2];
|
|
to[2] = from[3];
|
|
}
|
|
}
|
|
|
|
static const struct inode_operations sysv_symlink_inode_operations = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = page_follow_link_light,
|
|
.put_link = page_put_link,
|
|
.getattr = sysv_getattr,
|
|
};
|
|
|
|
void sysv_set_inode(struct inode *inode, dev_t rdev)
|
|
{
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &sysv_file_inode_operations;
|
|
inode->i_fop = &sysv_file_operations;
|
|
inode->i_mapping->a_ops = &sysv_aops;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &sysv_dir_inode_operations;
|
|
inode->i_fop = &sysv_dir_operations;
|
|
inode->i_mapping->a_ops = &sysv_aops;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
if (inode->i_blocks) {
|
|
inode->i_op = &sysv_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &sysv_aops;
|
|
} else
|
|
inode->i_op = &sysv_fast_symlink_inode_operations;
|
|
} else
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
}
|
|
|
|
struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
|
|
{
|
|
struct sysv_sb_info * sbi = SYSV_SB(sb);
|
|
struct buffer_head * bh;
|
|
struct sysv_inode * raw_inode;
|
|
struct sysv_inode_info * si;
|
|
struct inode *inode;
|
|
unsigned int block;
|
|
|
|
if (!ino || ino > sbi->s_ninodes) {
|
|
printk("Bad inode number on dev %s: %d is out of range\n",
|
|
sb->s_id, ino);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
inode = iget_locked(sb, ino);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW))
|
|
return inode;
|
|
|
|
raw_inode = sysv_raw_inode(sb, ino, &bh);
|
|
if (!raw_inode) {
|
|
printk("Major problem: unable to read inode from dev %s\n",
|
|
inode->i_sb->s_id);
|
|
goto bad_inode;
|
|
}
|
|
/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
|
|
inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
|
|
inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
|
|
inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
|
|
inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
|
|
inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
|
|
inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
|
|
inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
|
|
inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_mtime.tv_nsec = 0;
|
|
inode->i_blocks = 0;
|
|
|
|
si = SYSV_I(inode);
|
|
for (block = 0; block < 10+1+1+1; block++)
|
|
read3byte(sbi, &raw_inode->i_data[3*block],
|
|
(u8 *)&si->i_data[block]);
|
|
brelse(bh);
|
|
si->i_dir_start_lookup = 0;
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
sysv_set_inode(inode,
|
|
old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
|
|
else
|
|
sysv_set_inode(inode, 0);
|
|
unlock_new_inode(inode);
|
|
return inode;
|
|
|
|
bad_inode:
|
|
iget_failed(inode);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
static struct buffer_head * sysv_update_inode(struct inode * inode)
|
|
{
|
|
struct super_block * sb = inode->i_sb;
|
|
struct sysv_sb_info * sbi = SYSV_SB(sb);
|
|
struct buffer_head * bh;
|
|
struct sysv_inode * raw_inode;
|
|
struct sysv_inode_info * si;
|
|
unsigned int ino, block;
|
|
|
|
ino = inode->i_ino;
|
|
if (!ino || ino > sbi->s_ninodes) {
|
|
printk("Bad inode number on dev %s: %d is out of range\n",
|
|
inode->i_sb->s_id, ino);
|
|
return NULL;
|
|
}
|
|
raw_inode = sysv_raw_inode(sb, ino, &bh);
|
|
if (!raw_inode) {
|
|
printk("unable to read i-node block\n");
|
|
return NULL;
|
|
}
|
|
|
|
raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
|
|
raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
|
|
raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
|
|
raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
|
|
raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
|
|
raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
|
|
raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
|
|
raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
|
|
|
|
si = SYSV_I(inode);
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
|
|
for (block = 0; block < 10+1+1+1; block++)
|
|
write3byte(sbi, (u8 *)&si->i_data[block],
|
|
&raw_inode->i_data[3*block]);
|
|
mark_buffer_dirty(bh);
|
|
return bh;
|
|
}
|
|
|
|
int sysv_write_inode(struct inode * inode, int wait)
|
|
{
|
|
struct buffer_head *bh;
|
|
lock_kernel();
|
|
bh = sysv_update_inode(inode);
|
|
brelse(bh);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
|
|
int sysv_sync_inode(struct inode * inode)
|
|
{
|
|
int err = 0;
|
|
struct buffer_head *bh;
|
|
|
|
bh = sysv_update_inode(inode);
|
|
if (bh && buffer_dirty(bh)) {
|
|
sync_dirty_buffer(bh);
|
|
if (buffer_req(bh) && !buffer_uptodate(bh)) {
|
|
printk ("IO error syncing sysv inode [%s:%08lx]\n",
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
err = -1;
|
|
}
|
|
}
|
|
else if (!bh)
|
|
err = -1;
|
|
brelse (bh);
|
|
return err;
|
|
}
|
|
|
|
static void sysv_delete_inode(struct inode *inode)
|
|
{
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
inode->i_size = 0;
|
|
sysv_truncate(inode);
|
|
lock_kernel();
|
|
sysv_free_inode(inode);
|
|
unlock_kernel();
|
|
}
|
|
|
|
static struct kmem_cache *sysv_inode_cachep;
|
|
|
|
static struct inode *sysv_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct sysv_inode_info *si;
|
|
|
|
si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
|
|
if (!si)
|
|
return NULL;
|
|
return &si->vfs_inode;
|
|
}
|
|
|
|
static void sysv_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
|
|
}
|
|
|
|
static void init_once(struct kmem_cache *cachep, void *p)
|
|
{
|
|
struct sysv_inode_info *si = (struct sysv_inode_info *)p;
|
|
|
|
inode_init_once(&si->vfs_inode);
|
|
}
|
|
|
|
const struct super_operations sysv_sops = {
|
|
.alloc_inode = sysv_alloc_inode,
|
|
.destroy_inode = sysv_destroy_inode,
|
|
.write_inode = sysv_write_inode,
|
|
.delete_inode = sysv_delete_inode,
|
|
.put_super = sysv_put_super,
|
|
.write_super = sysv_write_super,
|
|
.remount_fs = sysv_remount,
|
|
.statfs = sysv_statfs,
|
|
};
|
|
|
|
int __init sysv_init_icache(void)
|
|
{
|
|
sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
|
|
sizeof(struct sysv_inode_info), 0,
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
|
|
init_once);
|
|
if (!sysv_inode_cachep)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void sysv_destroy_icache(void)
|
|
{
|
|
kmem_cache_destroy(sysv_inode_cachep);
|
|
}
|
|
|