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/* -*- linux-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 autofs_put_super(struct super_block *sb)

{

        struct autofs_sb_info *sbi = autofs_sbi(sb);

        unsigned int n;

        if ( !sbi->catatonic )

                autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */

        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);

        }

        kfree(sb->u.generic_sbp);

        DPRINTK(("autofs: shutting down\n"));

}

static int autofs_statfs(struct super_block *sb, struct statfs *buf);

static void autofs_read_inode(struct inode *inode);

static struct super_operations autofs_sops = {

        read_inode:     autofs_read_inode,

        put_super:      autofs_put_super,

        statfs:         autofs_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 = *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)

{

        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(struct autofs_sb_info), GFP_KERNEL);

        if ( !sbi )

                goto fail_unlock;

        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(long)*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;

        root_inode = iget(s, AUTOFS_ROOT_INO);

        root = d_alloc_root(root_inode);

        pipe = NULL;

        if (!root)

                goto fail_iput;

        /* Can this call block?  - WTF cares? s is locked. */

        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 ( minproto > AUTOFS_PROTO_VERSION ||

             maxproto < AUTOFS_PROTO_VERSION ) {

                printk("autofs: kernel does not match daemon version\n");

                goto fail_dput;

        }

        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;

fail_fput:

        printk("autofs: pipe file descriptor does not contain proper ops\n");

        fput(pipe);

fail_dput:

        dput(root);

        goto fail_free;

fail_iput:

        printk("autofs: get root dentry failed\n");

        iput(root_inode);

fail_free:

        kfree(sbi);

fail_unlock:

        return NULL;

}

static int autofs_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;

}

static void autofs_read_inode(struct inode *inode)

{

        ino_t ino = inode->i_ino;

        unsigned int n;

        struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);

        /* Initialize to the default case (stub directory) */

        inode->i_op = &autofs_dir_inode_operations;

        inode->i_fop = &dcache_dir_ops;

        inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;

        inode->i_nlink = 2;

        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_fop = &autofs_root_operations;

                inode->i_uid = inode->i_gid = 0; /* Changed in read_super */

                return;

        }

        inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;

        inode->i_gid = inode->i_sb->s_root->d_inode->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 %u\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;

        }

}