kernel-ark/fs/autofs/inode.c
Alexander Krizhanovsky f76baf9365 [PATCH] autofs: fix "busy inodes after umount..."
This patch for old autofs (version 3) cleans dentries which are not putted
after killing the automount daemon (it's analogue of recent patch for
autofs4).

Signed-off-by: Alexander Krizhanovsky <klx@yandex.ru>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-09 13:57:31 -07:00

252 lines
6.1 KiB
C

/* -*- 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/mm.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/bitops.h>
#include "autofs_i.h"
#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);
for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
if ( test_bit(n, sbi->symlink_bitmap) )
kfree(sbi->symlink[n].data);
}
kfree(sb->s_fs_info);
DPRINTK(("autofs: shutting down\n"));
}
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 = simple_statfs,
};
enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
static match_table_t autofs_tokens = {
{Opt_fd, "fd=%u"},
{Opt_uid, "uid=%u"},
{Opt_gid, "gid=%u"},
{Opt_pgrp, "pgrp=%u"},
{Opt_minproto, "minproto=%u"},
{Opt_maxproto, "maxproto=%u"},
{Opt_err, NULL}
};
static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
*uid = current->uid;
*gid = current->gid;
*pgrp = process_group(current);
*minproto = *maxproto = AUTOFS_PROTO_VERSION;
*pipefd = -1;
if (!options)
return 1;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, autofs_tokens, args);
switch (token) {
case Opt_fd:
if (match_int(&args[0], &option))
return 1;
*pipefd = option;
break;
case Opt_uid:
if (match_int(&args[0], &option))
return 1;
*uid = option;
break;
case Opt_gid:
if (match_int(&args[0], &option))
return 1;
*gid = option;
break;
case Opt_pgrp:
if (match_int(&args[0], &option))
return 1;
*pgrp = option;
break;
case Opt_minproto:
if (match_int(&args[0], &option))
return 1;
*minproto = option;
break;
case Opt_maxproto:
if (match_int(&args[0], &option))
return 1;
*maxproto = option;
break;
default:
return 1;
}
}
return (*pipefd < 0);
}
int autofs_fill_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 = kmalloc(sizeof(*sbi), GFP_KERNEL);
if ( !sbi )
goto fail_unlock;
memset(sbi, 0, sizeof(*sbi));
DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
s->s_fs_info = sbi;
sbi->magic = AUTOFS_SBI_MAGIC;
sbi->catatonic = 0;
sbi->exp_timeout = 0;
sbi->oz_pgrp = process_group(current);
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;
s->s_time_gran = 1;
sbi->sb = s;
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 0;
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 -EINVAL;
}
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 = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
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.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
inode->i_size = sl->len;
inode->i_nlink = 1;
}
}