* linux/fs/autofs/inode.c
*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ * Copyright 2005-2006 Ian Kent <raven@themaw.net>
*
* 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
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/file.h>
+#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/parser.h>
#include <linux/bitops.h>
-#include <linux/smp_lock.h>
+#include <linux/magic.h>
#include "autofs_i.h"
#include <linux/module.h>
static void ino_lnkfree(struct autofs_info *ino)
{
- kfree(ino->u.symlink);
- ino->u.symlink = NULL;
+ if (ino->u.symlink) {
+ kfree(ino->u.symlink);
+ ino->u.symlink = NULL;
+ }
}
struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
if (ino == NULL)
return NULL;
- ino->flags = 0;
- ino->mode = mode;
- ino->inode = NULL;
- ino->dentry = NULL;
- ino->size = 0;
+ if (!reinit) {
+ ino->flags = 0;
+ ino->inode = NULL;
+ ino->dentry = NULL;
+ ino->size = 0;
+ INIT_LIST_HEAD(&ino->active);
+ INIT_LIST_HEAD(&ino->rehash_list);
+ ino->active_count = 0;
+ INIT_LIST_HEAD(&ino->expiring);
+ atomic_set(&ino->count, 0);
+ }
+ ino->uid = 0;
+ ino->gid = 0;
+ ino->mode = mode;
ino->last_used = jiffies;
ino->sbi = sbi;
void autofs4_free_ino(struct autofs_info *ino)
{
+ struct autofs_info *p_ino;
+
if (ino->dentry) {
ino->dentry->d_fsdata = NULL;
- if (ino->dentry->d_inode)
+ if (ino->dentry->d_inode) {
+ struct dentry *parent = ino->dentry->d_parent;
+ if (atomic_dec_and_test(&ino->count)) {
+ p_ino = autofs4_dentry_ino(parent);
+ if (p_ino && parent != ino->dentry)
+ atomic_dec(&p_ino->count);
+ }
dput(ino->dentry);
+ }
ino->dentry = NULL;
}
if (ino->free)
*/
static void autofs4_force_release(struct autofs_sb_info *sbi)
{
- struct dentry *this_parent = sbi->root;
+ struct dentry *this_parent = sbi->sb->s_root;
struct list_head *next;
+ if (!sbi->sb->s_root)
+ return;
+
spin_lock(&dcache_lock);
repeat:
next = this_parent->d_subdirs.next;
spin_lock(&dcache_lock);
}
- if (this_parent != sbi->root) {
+ if (this_parent != sbi->sb->s_root) {
struct dentry *dentry = this_parent;
next = this_parent->d_u.d_child.next;
goto resume;
}
spin_unlock(&dcache_lock);
-
- dput(sbi->root);
- sbi->root = NULL;
- shrink_dcache_sb(sbi->sb);
-
- return;
}
-static void autofs4_put_super(struct super_block *sb)
+void autofs4_kill_sb(struct super_block *sb)
{
struct autofs_sb_info *sbi = autofs4_sbi(sb);
- sb->s_fs_info = NULL;
+ /*
+ * In the event of a failure in get_sb_nodev the superblock
+ * info is not present so nothing else has been setup, so
+ * just call kill_anon_super when we are called from
+ * deactivate_super.
+ */
+ if (!sbi)
+ goto out_kill_sb;
- if ( !sbi->catatonic )
- autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
+ /* Free wait queues, close pipe */
+ autofs4_catatonic_mode(sbi);
/* Clean up and release dangling references */
- if (sbi)
- autofs4_force_release(sbi);
+ autofs4_force_release(sbi);
+ sb->s_fs_info = NULL;
kfree(sbi);
+out_kill_sb:
DPRINTK("shutting down");
+ kill_anon_super(sb);
+}
+
+static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
+ struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;
+
+ if (!sbi)
+ return 0;
+
+ seq_printf(m, ",fd=%d", sbi->pipefd);
+ if (root_inode->i_uid != 0)
+ seq_printf(m, ",uid=%u", root_inode->i_uid);
+ if (root_inode->i_gid != 0)
+ seq_printf(m, ",gid=%u", root_inode->i_gid);
+ seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
+ seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
+ seq_printf(m, ",minproto=%d", sbi->min_proto);
+ seq_printf(m, ",maxproto=%d", sbi->max_proto);
+
+ if (autofs_type_offset(sbi->type))
+ seq_printf(m, ",offset");
+ else if (autofs_type_direct(sbi->type))
+ seq_printf(m, ",direct");
+ else
+ seq_printf(m, ",indirect");
+
+ return 0;
}
-static struct super_operations autofs4_sops = {
- .put_super = autofs4_put_super,
+static const struct super_operations autofs4_sops = {
.statfs = simple_statfs,
+ .show_options = autofs4_show_options,
};
-enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
+ Opt_indirect, Opt_direct, Opt_offset};
-static match_table_t tokens = {
+static const match_table_t 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_indirect, "indirect"},
+ {Opt_direct, "direct"},
+ {Opt_offset, "offset"},
{Opt_err, NULL}
};
static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
- pid_t *pgrp, int *minproto, int *maxproto)
+ pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
- *uid = current->uid;
- *gid = current->gid;
- *pgrp = process_group(current);
+ *uid = current_uid();
+ *gid = current_gid();
+ *pgrp = task_pgrp_nr(current);
*minproto = AUTOFS_MIN_PROTO_VERSION;
*maxproto = AUTOFS_MAX_PROTO_VERSION;
return 1;
*maxproto = option;
break;
+ case Opt_indirect:
+ set_autofs_type_indirect(type);
+ break;
+ case Opt_direct:
+ set_autofs_type_direct(type);
+ break;
+ case Opt_offset:
+ set_autofs_type_offset(type);
+ break;
default:
return 1;
}
return ino;
}
+static const struct dentry_operations autofs4_sb_dentry_operations = {
+ .d_release = autofs4_dentry_release,
+};
+
int autofs4_fill_super(struct super_block *s, void *data, int silent)
{
struct inode * root_inode;
int pipefd;
struct autofs_sb_info *sbi;
struct autofs_info *ino;
- int minproto, maxproto;
- sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
- if ( !sbi )
+ sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+ if (!sbi)
goto fail_unlock;
DPRINTK("starting up, sbi = %p",sbi);
- memset(sbi, 0, sizeof(*sbi));
-
s->s_fs_info = sbi;
sbi->magic = AUTOFS_SBI_MAGIC;
- sbi->root = NULL;
- sbi->catatonic = 0;
+ sbi->pipefd = -1;
+ sbi->pipe = NULL;
+ sbi->catatonic = 1;
sbi->exp_timeout = 0;
- sbi->oz_pgrp = process_group(current);
+ sbi->oz_pgrp = task_pgrp_nr(current);
sbi->sb = s;
sbi->version = 0;
sbi->sub_version = 0;
- init_MUTEX(&sbi->wq_sem);
+ set_autofs_type_indirect(&sbi->type);
+ sbi->min_proto = 0;
+ sbi->max_proto = 0;
+ mutex_init(&sbi->wq_mutex);
spin_lock_init(&sbi->fs_lock);
sbi->queues = NULL;
+ spin_lock_init(&sbi->lookup_lock);
+ INIT_LIST_HEAD(&sbi->active_list);
+ INIT_LIST_HEAD(&sbi->expiring_list);
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = AUTOFS_SUPER_MAGIC;
if (!ino)
goto fail_free;
root_inode = autofs4_get_inode(s, ino);
- kfree(ino);
if (!root_inode)
- goto fail_free;
+ goto fail_ino;
- 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;
+ pipe = NULL;
+
+ root->d_op = &autofs4_sb_dentry_operations;
+ root->d_fsdata = ino;
/* Can this call block? */
- if (parse_options(data, &pipefd,
- &root_inode->i_uid, &root_inode->i_gid,
- &sbi->oz_pgrp,
- &minproto, &maxproto)) {
+ if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
+ &sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
+ &sbi->max_proto)) {
printk("autofs: called with bogus options\n");
goto fail_dput;
}
+ root_inode->i_fop = &autofs4_root_operations;
+ root_inode->i_op = autofs_type_trigger(sbi->type) ?
+ &autofs4_direct_root_inode_operations :
+ &autofs4_indirect_root_inode_operations;
+
/* Couldn't this be tested earlier? */
- if (maxproto < AUTOFS_MIN_PROTO_VERSION ||
- minproto > AUTOFS_MAX_PROTO_VERSION) {
+ if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
+ sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
printk("autofs: kernel does not match daemon version "
"daemon (%d, %d) kernel (%d, %d)\n",
- minproto, maxproto,
+ sbi->min_proto, sbi->max_proto,
AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
goto fail_dput;
}
- sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
+ /* Establish highest kernel protocol version */
+ if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
+ sbi->version = AUTOFS_MAX_PROTO_VERSION;
+ else
+ sbi->version = sbi->max_proto;
sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
pipe = fget(pipefd);
- if ( !pipe ) {
+ if (!pipe) {
printk("autofs: could not open pipe file descriptor\n");
goto fail_dput;
}
- if ( !pipe->f_op || !pipe->f_op->write )
+ if (!pipe->f_op || !pipe->f_op->write)
goto fail_fput;
sbi->pipe = pipe;
-
- /*
- * Take a reference to the root dentry so we get a chance to
- * clean up the dentry tree on umount.
- * See autofs4_force_release.
- */
- sbi->root = dget(root);
+ sbi->pipefd = pipefd;
+ sbi->catatonic = 0;
/*
* Success! Install the root dentry now to indicate completion.
fail_iput:
printk("autofs: get root dentry failed\n");
iput(root_inode);
+fail_ino:
+ kfree(ino);
fail_free:
kfree(sbi);
+ s->s_fs_info = NULL;
fail_unlock:
return -EINVAL;
}
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_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
if (S_ISDIR(inf->mode)) {
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