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/* -*- c -*- --------------------------------------------------------------- *
*
* linux/fs/autofs/inode.c
*
* Copyright 1997-1998 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/slab.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 ino_lnkfree(struct autofs_info *ino)
{
if (ino->u.symlink) {
kfree(ino->u.symlink);
ino->u.symlink = NULL;
}
}
struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
struct autofs_sb_info *sbi, mode_t mode)
{
int reinit = 1;
if (ino == NULL) {
reinit = 0;
ino = kmalloc(sizeof(*ino), GFP_KERNEL);
}
if (ino == NULL)
return NULL;
ino->flags = 0;
ino->mode = mode;
ino->inode = NULL;
ino->dentry = NULL;
ino->size = 0;
ino->last_used = jiffies;
ino->sbi = sbi;
if (reinit && ino->free)
(ino->free)(ino);
memset(&ino->u, 0, sizeof(ino->u));
ino->free = NULL;
if (S_ISLNK(mode))
ino->free = ino_lnkfree;
return ino;
}
void autofs4_free_ino(struct autofs_info *ino)
{
if (ino->dentry) {
ino->dentry->d_fsdata = NULL;
if (ino->dentry->d_inode)
dput(ino->dentry);
ino->dentry = NULL;
}
if (ino->free)
(ino->free)(ino);
kfree(ino);
}
static void autofs4_put_super(struct super_block *sb)
{
struct autofs_sb_info *sbi = autofs4_sbi(sb);
sb->u.generic_sbp = NULL;
if ( !sbi->catatonic )
autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
kfree(sbi);
DPRINTK(("autofs: shutting down\n"));
}
static int autofs4_statfs(struct super_block *sb, struct statfs *buf);
static struct super_operations autofs4_sops = {
put_super: autofs4_put_super,
statfs: autofs4_statfs,
};
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 = AUTOFS_MIN_PROTO_VERSION;
*maxproto = AUTOFS_MAX_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);
}
static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
{
struct autofs_info *ino;
ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755);
if (!ino)
return NULL;
return ino;
}
struct super_block *autofs4_read_super(struct super_block *s, void *data,
int silent)
{
struct inode * root_inode;
struct dentry * root;
struct file * pipe;
int pipefd;
struct autofs_sb_info *sbi;
int minproto, maxproto;
sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
if ( !sbi )
goto fail_unlock;
DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
memset(sbi, 0, sizeof(*sbi));
s->u.generic_sbp = sbi;
sbi->magic = AUTOFS_SBI_MAGIC;
sbi->catatonic = 0;
sbi->exp_timeout = 0;
sbi->oz_pgrp = current->pgrp;
sbi->sb = s;
sbi->version = 0;
sbi->queues = NULL;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = AUTOFS_SUPER_MAGIC;
s->s_op = &autofs4_sops;
/*
* Get the root inode and dentry, but defer checking for errors.
*/
root_inode = autofs4_get_inode(s, autofs4_mkroot(sbi));
root_inode->i_op = &autofs4_root_inode_operations;
root_inode->i_fop = &autofs4_root_operations;
root = d_alloc_root(root_inode);
pipe = NULL;
if (!root)
goto fail_iput;
/* Can this call block? */
if (parse_options(data, &pipefd,
&root_inode->i_uid, &root_inode->i_gid,
&sbi->oz_pgrp,
&minproto, &maxproto)) {
printk("autofs: called with bogus options\n");
goto fail_dput;
}
/* Couldn't this be tested earlier? */
if (maxproto < AUTOFS_MIN_PROTO_VERSION ||
minproto > AUTOFS_MAX_PROTO_VERSION) {
printk("autofs: kernel does not match daemon version "
"daemon (%d, %d) kernel (%d, %d)\n",
minproto, maxproto,
AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
goto fail_dput;
}
sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
pipe = fget(pipefd);
if ( !pipe ) {
printk("autofs: could not open pipe file descriptor\n");
goto fail_dput;
}
if ( !pipe->f_op || !pipe->f_op->write )
goto fail_fput;
sbi->pipe = pipe;
/*
* Success! Install the root dentry now to indicate completion.
*/
s->s_root = root;
return s;
/*
* Failure ... clean up.
*/
fail_fput:
printk("autofs: pipe file descriptor does not contain proper ops\n");
/*
* fput() can block, so we clear the super block first.
*/
fput(pipe);
/* fall through */
fail_dput:
/*
* dput() can block, so we clear the super block first.
*/
dput(root);
goto fail_free;
fail_iput:
printk("autofs: get root dentry failed\n");
/*
* iput() can block, so we clear the super block first.
*/
iput(root_inode);
fail_free:
kfree(sbi);
fail_unlock:
return NULL;
}
static int autofs4_statfs(struct super_block *sb, struct statfs *buf)
{
buf->f_type = AUTOFS_SUPER_MAGIC;
buf->f_bsize = 1024;
buf->f_namelen = NAME_MAX;
return 0;
}
struct inode *autofs4_get_inode(struct super_block *sb,
struct autofs_info *inf)
{
struct inode *inode = new_inode(sb);
if (inode == NULL)
return NULL;
inf->inode = inode;
inode->i_mode = inf->mode;
if (sb->s_root) {
inode->i_uid = sb->s_root->d_inode->i_uid;
inode->i_gid = sb->s_root->d_inode->i_gid;
} else {
inode->i_uid = 0;
inode->i_gid = 0;
}
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_rdev = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
if (S_ISDIR(inf->mode)) {
inode->i_nlink = 2;
inode->i_op = &autofs4_dir_inode_operations;
inode->i_fop = &autofs4_dir_operations;
} else if (S_ISLNK(inf->mode)) {
inode->i_size = inf->size;
inode->i_op = &autofs4_symlink_inode_operations;
}
return inode;
}
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