/* -*- linux-c -*- --------------------------------------------------------- *
*
* linux/fs/autofs/inode.c
*
* Copyright 1997 Transmeta Corporation -- All Rights Reserved
*
* This file is part of the Linux kernel and is made available under
* the terms of the GNU General Public License, version 2, or at your
* option, any later version, incorporated herein by reference.
*
* ------------------------------------------------------------------------- */
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/file.h>
#include <linux/locks.h>
#include <asm/bitops.h>
#include "autofs_i.h"
#define __NO_VERSION__
#include <linux/module.h>
static void autofs_put_inode(struct inode *inode)
{
if (inode->i_nlink)
return;
inode->i_size = 0;
}
static void autofs_put_super(struct super_block *sb)
{
struct autofs_sb_info *sbi =
(struct autofs_sb_info *) sb->u.generic_sbp;
unsigned int n;
if ( !sbi->catatonic )
autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
lock_super(sb);
autofs_hash_nuke(&sbi->dirhash);
for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
if ( test_bit(n, sbi->symlink_bitmap) )
kfree(sbi->symlink[n].data);
}
sb->s_dev = 0;
kfree(sb->u.generic_sbp);
unlock_super(sb);
DPRINTK(("autofs: shutting down\n"));
#ifdef MODULE
MOD_DEC_USE_COUNT;
#endif
}
static void autofs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz);
static void autofs_read_inode(struct inode *inode);
static void autofs_write_inode(struct inode *inode);
static struct super_operations autofs_sops = {
autofs_read_inode,
NULL,
autofs_write_inode,
autofs_put_inode,
autofs_put_super,
NULL,
autofs_statfs,
NULL
};
static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto)
{
char *this_char, *value;
*uid = current->uid;
*gid = current->gid;
*pgrp = current->pgrp;
*minproto = *maxproto = AUTOFS_PROTO_VERSION;
*pipefd = -1;
if ( !options ) return 1;
for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
if ((value = strchr(this_char,'=')) != NULL)
*value++ = 0;
if (!strcmp(this_char,"fd")) {
if (!value || !*value)
return 1;
*pipefd = simple_strtoul(value,&value,0);
if (*value)
return 1;
}
else if (!strcmp(this_char,"uid")) {
if (!value || !*value)
return 1;
*uid = simple_strtoul(value,&value,0);
if (*value)
return 1;
}
else if (!strcmp(this_char,"gid")) {
if (!value || !*value)
return 1;
*gid = simple_strtoul(value,&value,0);
if (*value)
return 1;
}
else if (!strcmp(this_char,"pgrp")) {
if (!value || !*value)
return 1;
*pgrp = simple_strtoul(value,&value,0);
if (*value)
return 1;
}
else if (!strcmp(this_char,"minproto")) {
if (!value || !*value)
return 1;
*minproto = simple_strtoul(value,&value,0);
if (*value)
return 1;
}
else if (!strcmp(this_char,"maxproto")) {
if (!value || !*value)
return 1;
*maxproto = simple_strtoul(value,&value,0);
if (*value)
return 1;
}
else break;
}
return (*pipefd < 0);
}
struct super_block *autofs_read_super(struct super_block *s, void *data,
int silent)
{
int pipefd;
struct autofs_sb_info *sbi;
int minproto, maxproto;
MOD_INC_USE_COUNT;
lock_super(s);
sbi = (struct autofs_sb_info *) kmalloc(sizeof(struct autofs_sb_info), GFP_KERNEL);
if ( !sbi ) {
s->s_dev = 0;
MOD_DEC_USE_COUNT;
return NULL;
}
DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
s->u.generic_sbp = sbi;
sbi->magic = AUTOFS_SBI_MAGIC;
sbi->catatonic = 0;
sbi->exp_timeout = 0;
sbi->oz_pgrp = current->pgrp;
autofs_initialize_hash(&sbi->dirhash);
sbi->queues = NULL;
memset(sbi->symlink_bitmap, 0, sizeof(u32)*AUTOFS_SYMLINK_BITMAP_LEN);
sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = AUTOFS_SUPER_MAGIC;
s->s_op = &autofs_sops;
unlock_super(s);
if (!(s->s_mounted = iget(s, AUTOFS_ROOT_INO))) {
s->s_dev = 0;
kfree(sbi);
printk("autofs: get root inode failed\n");
MOD_DEC_USE_COUNT;
return NULL;
}
if ( parse_options(data,&pipefd,&s->s_mounted->i_uid,&s->s_mounted->i_gid,&sbi->oz_pgrp,&minproto,&maxproto) ) {
iput(s->s_mounted);
s->s_dev = 0;
kfree(sbi);
printk("autofs: called with bogus options\n");
MOD_DEC_USE_COUNT;
return NULL;
}
if ( minproto > AUTOFS_PROTO_VERSION || maxproto < AUTOFS_PROTO_VERSION ) {
iput(s->s_mounted);
s->s_dev = 0;
kfree(sbi);
printk("autofs: kernel does not match daemon version\n");
MOD_DEC_USE_COUNT;
return NULL;
}
DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
sbi->pipe = fget(pipefd);
if ( !sbi->pipe || !sbi->pipe->f_op || !sbi->pipe->f_op->write ) {
if ( sbi->pipe ) {
fput(sbi->pipe, sbi->pipe->f_inode);
printk("autofs: pipe file descriptor does not contain proper ops\n");
} else {
printk("autofs: could not open pipe file descriptor\n");
}
iput(s->s_mounted);
s->s_dev = 0;
kfree(sbi);
MOD_DEC_USE_COUNT;
return NULL;
}
return s;
}
static void autofs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
{
struct statfs tmp;
tmp.f_type = AUTOFS_SUPER_MAGIC;
tmp.f_bsize = 1024;
tmp.f_blocks = 0;
tmp.f_bfree = 0;
tmp.f_bavail = 0;
tmp.f_files = 0;
tmp.f_ffree = 0;
tmp.f_namelen = NAME_MAX;
copy_to_user(buf, &tmp, bufsiz);
}
static void autofs_read_inode(struct inode *inode)
{
ino_t ino = inode->i_ino;
unsigned int n;
struct autofs_sb_info *sbi =
(struct autofs_sb_info *) inode->i_sb->u.generic_sbp;
inode->i_op = NULL;
inode->i_mode = 0;
inode->i_nlink = 2;
inode->i_size = 0;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_blocks = 0;
inode->i_blksize = 1024;
if ( ino == AUTOFS_ROOT_INO ) {
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
inode->i_op = &autofs_root_inode_operations;
inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
return;
}
inode->i_uid = inode->i_sb->s_mounted->i_uid;
inode->i_gid = inode->i_sb->s_mounted->i_gid;
if ( ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO ) {
/* Symlink inode - should be in symlink list */
struct autofs_symlink *sl;
n = ino - AUTOFS_FIRST_SYMLINK;
if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
printk("autofs: Looking for bad symlink inode 0x%08x\n", (unsigned int) ino);
return;
}
inode->i_op = &autofs_symlink_inode_operations;
sl = &sbi->symlink[n];
inode->u.generic_ip = sl;
inode->i_mode = S_IFLNK | S_IRWXUGO;
inode->i_mtime = inode->i_ctime = sl->mtime;
inode->i_size = sl->len;
inode->i_nlink = 1;
} else {
/* All non-root directory inodes look the same */
inode->i_op = &autofs_dir_inode_operations;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
}
}
static void autofs_write_inode(struct inode *inode)
{
inode->i_dirt = 0;
}
