291 строка
6.7 KiB
C
291 строка
6.7 KiB
C
/* -*- linux-c -*- --------------------------------------------------------- *
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*
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* linux/fs/autofs/inode.c
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*
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* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
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*
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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*
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* ------------------------------------------------------------------------- */
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/parser.h>
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#include <linux/bitops.h>
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#include <linux/magic.h>
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#include "autofs_i.h"
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#include <linux/module.h>
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void autofs_kill_sb(struct super_block *sb)
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{
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struct autofs_sb_info *sbi = autofs_sbi(sb);
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unsigned int n;
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/*
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* In the event of a failure in get_sb_nodev the superblock
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* info is not present so nothing else has been setup, so
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* just call kill_anon_super when we are called from
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* deactivate_super.
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*/
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if (!sbi)
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goto out_kill_sb;
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if (!sbi->catatonic)
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autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
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put_pid(sbi->oz_pgrp);
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autofs_hash_nuke(sbi);
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for (n = 0; n < AUTOFS_MAX_SYMLINKS; n++) {
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if (test_bit(n, sbi->symlink_bitmap))
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kfree(sbi->symlink[n].data);
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}
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kfree(sb->s_fs_info);
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out_kill_sb:
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DPRINTK(("autofs: shutting down\n"));
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kill_anon_super(sb);
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}
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static const struct super_operations autofs_sops = {
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.statfs = simple_statfs,
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.show_options = generic_show_options,
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};
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enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
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static const match_table_t autofs_tokens = {
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{Opt_fd, "fd=%u"},
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_pgrp, "pgrp=%u"},
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{Opt_minproto, "minproto=%u"},
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{Opt_maxproto, "maxproto=%u"},
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{Opt_err, NULL}
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};
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static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
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pid_t *pgrp, int *minproto, int *maxproto)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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*uid = current->uid;
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*gid = current->gid;
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*pgrp = task_pgrp_nr(current);
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*minproto = *maxproto = AUTOFS_PROTO_VERSION;
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*pipefd = -1;
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if (!options)
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return 1;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, autofs_tokens, args);
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switch (token) {
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case Opt_fd:
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if (match_int(&args[0], &option))
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return 1;
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*pipefd = option;
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break;
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case Opt_uid:
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if (match_int(&args[0], &option))
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return 1;
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*uid = option;
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break;
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case Opt_gid:
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if (match_int(&args[0], &option))
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return 1;
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*gid = option;
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break;
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case Opt_pgrp:
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if (match_int(&args[0], &option))
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return 1;
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*pgrp = option;
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break;
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case Opt_minproto:
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if (match_int(&args[0], &option))
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return 1;
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*minproto = option;
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break;
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case Opt_maxproto:
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if (match_int(&args[0], &option))
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return 1;
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*maxproto = option;
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break;
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default:
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return 1;
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}
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}
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return (*pipefd < 0);
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}
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int autofs_fill_super(struct super_block *s, void *data, int silent)
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{
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struct inode * root_inode;
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struct dentry * root;
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struct file * pipe;
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int pipefd;
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struct autofs_sb_info *sbi;
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int minproto, maxproto;
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pid_t pgid;
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save_mount_options(s, data);
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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goto fail_unlock;
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DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
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s->s_fs_info = sbi;
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sbi->magic = AUTOFS_SBI_MAGIC;
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sbi->pipe = NULL;
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sbi->catatonic = 1;
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sbi->exp_timeout = 0;
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autofs_initialize_hash(&sbi->dirhash);
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sbi->queues = NULL;
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memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
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sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
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s->s_blocksize = 1024;
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s->s_blocksize_bits = 10;
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s->s_magic = AUTOFS_SUPER_MAGIC;
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s->s_op = &autofs_sops;
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s->s_time_gran = 1;
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sbi->sb = s;
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root_inode = autofs_iget(s, AUTOFS_ROOT_INO);
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if (IS_ERR(root_inode))
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goto fail_free;
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root = d_alloc_root(root_inode);
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pipe = NULL;
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if (!root)
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goto fail_iput;
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/* Can this call block? - WTF cares? s is locked. */
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if (parse_options(data, &pipefd, &root_inode->i_uid,
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&root_inode->i_gid, &pgid, &minproto,
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&maxproto)) {
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printk("autofs: called with bogus options\n");
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goto fail_dput;
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}
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/* Couldn't this be tested earlier? */
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if (minproto > AUTOFS_PROTO_VERSION ||
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maxproto < AUTOFS_PROTO_VERSION) {
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printk("autofs: kernel does not match daemon version\n");
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goto fail_dput;
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}
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DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, pgid));
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sbi->oz_pgrp = find_get_pid(pgid);
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if (!sbi->oz_pgrp) {
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printk("autofs: could not find process group %d\n", pgid);
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goto fail_dput;
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}
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pipe = fget(pipefd);
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if (!pipe) {
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printk("autofs: could not open pipe file descriptor\n");
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goto fail_put_pid;
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}
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if (!pipe->f_op || !pipe->f_op->write)
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goto fail_fput;
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sbi->pipe = pipe;
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sbi->catatonic = 0;
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/*
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* Success! Install the root dentry now to indicate completion.
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*/
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s->s_root = root;
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return 0;
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fail_fput:
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printk("autofs: pipe file descriptor does not contain proper ops\n");
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fput(pipe);
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fail_put_pid:
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put_pid(sbi->oz_pgrp);
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fail_dput:
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dput(root);
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goto fail_free;
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fail_iput:
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printk("autofs: get root dentry failed\n");
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iput(root_inode);
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fail_free:
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kfree(sbi);
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s->s_fs_info = NULL;
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fail_unlock:
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return -EINVAL;
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}
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struct inode *autofs_iget(struct super_block *sb, unsigned long ino)
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{
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unsigned int n;
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struct autofs_sb_info *sbi = autofs_sbi(sb);
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struct inode *inode;
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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/* Initialize to the default case (stub directory) */
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
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inode->i_nlink = 2;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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inode->i_blocks = 0;
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if (ino == AUTOFS_ROOT_INO) {
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inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
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inode->i_op = &autofs_root_inode_operations;
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inode->i_fop = &autofs_root_operations;
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inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
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goto done;
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}
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inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
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inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
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if (ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO) {
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/* Symlink inode - should be in symlink list */
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struct autofs_symlink *sl;
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n = ino - AUTOFS_FIRST_SYMLINK;
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if (n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
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printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
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goto done;
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}
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inode->i_op = &autofs_symlink_inode_operations;
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sl = &sbi->symlink[n];
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inode->i_private = sl;
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inode->i_mode = S_IFLNK | S_IRWXUGO;
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inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
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inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
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inode->i_size = sl->len;
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inode->i_nlink = 1;
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}
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done:
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unlock_new_inode(inode);
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return inode;
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}
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