/* -*- 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;}