1 /* -*- c -*- --------------------------------------------------------------- *
3 * linux/fs/autofs/inode.c
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
7 * This file is part of the Linux kernel and is made available under
8 * the terms of the GNU General Public License, version 2, or at your
9 * option, any later version, incorporated herein by reference.
11 * ------------------------------------------------------------------------- */
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/file.h>
16 #include <linux/seq_file.h>
17 #include <linux/pagemap.h>
18 #include <linux/parser.h>
19 #include <linux/bitops.h>
20 #include <linux/smp_lock.h>
22 #include <linux/module.h>
24 static void ino_lnkfree(struct autofs_info *ino)
26 kfree(ino->u.symlink);
27 ino->u.symlink = NULL;
30 struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
31 struct autofs_sb_info *sbi, mode_t mode)
37 ino = kmalloc(sizeof(*ino), GFP_KERNEL);
49 ino->last_used = jiffies;
50 atomic_set(&ino->count, 0);
54 if (reinit && ino->free)
57 memset(&ino->u, 0, sizeof(ino->u));
62 ino->free = ino_lnkfree;
67 void autofs4_free_ino(struct autofs_info *ino)
69 struct autofs_info *p_ino;
72 ino->dentry->d_fsdata = NULL;
73 if (ino->dentry->d_inode) {
74 struct dentry *parent = ino->dentry->d_parent;
75 if (atomic_dec_and_test(&ino->count)) {
76 p_ino = autofs4_dentry_ino(parent);
77 if (p_ino && parent != ino->dentry)
78 atomic_dec(&p_ino->count);
90 * Deal with the infamous "Busy inodes after umount ..." message.
92 * Clean up the dentry tree. This happens with autofs if the user
93 * space program goes away due to a SIGKILL, SIGSEGV etc.
95 static void autofs4_force_release(struct autofs_sb_info *sbi)
97 struct dentry *this_parent = sbi->root;
98 struct list_head *next;
100 spin_lock(&dcache_lock);
102 next = this_parent->d_subdirs.next;
104 while (next != &this_parent->d_subdirs) {
105 struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
107 /* Negative dentry - don`t care */
108 if (!simple_positive(dentry)) {
113 if (!list_empty(&dentry->d_subdirs)) {
114 this_parent = dentry;
119 spin_unlock(&dcache_lock);
121 DPRINTK("dentry %p %.*s",
122 dentry, (int)dentry->d_name.len, dentry->d_name.name);
125 spin_lock(&dcache_lock);
128 if (this_parent != sbi->root) {
129 struct dentry *dentry = this_parent;
131 next = this_parent->d_u.d_child.next;
132 this_parent = this_parent->d_parent;
133 spin_unlock(&dcache_lock);
134 DPRINTK("parent dentry %p %.*s",
135 dentry, (int)dentry->d_name.len, dentry->d_name.name);
137 spin_lock(&dcache_lock);
140 spin_unlock(&dcache_lock);
144 shrink_dcache_sb(sbi->sb);
149 static void autofs4_put_super(struct super_block *sb)
151 struct autofs_sb_info *sbi = autofs4_sbi(sb);
153 sb->s_fs_info = NULL;
155 if ( !sbi->catatonic )
156 autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
158 /* Clean up and release dangling references */
160 autofs4_force_release(sbi);
164 DPRINTK("shutting down");
167 static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
169 struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
174 seq_printf(m, ",fd=%d", sbi->pipefd);
175 seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
176 seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
177 seq_printf(m, ",minproto=%d", sbi->min_proto);
178 seq_printf(m, ",maxproto=%d", sbi->max_proto);
183 static struct super_operations autofs4_sops = {
184 .put_super = autofs4_put_super,
185 .statfs = simple_statfs,
186 .show_options = autofs4_show_options,
189 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
191 static match_table_t tokens = {
195 {Opt_pgrp, "pgrp=%u"},
196 {Opt_minproto, "minproto=%u"},
197 {Opt_maxproto, "maxproto=%u"},
201 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
202 pid_t *pgrp, int *minproto, int *maxproto)
205 substring_t args[MAX_OPT_ARGS];
210 *pgrp = process_group(current);
212 *minproto = AUTOFS_MIN_PROTO_VERSION;
213 *maxproto = AUTOFS_MAX_PROTO_VERSION;
220 while ((p = strsep(&options, ",")) != NULL) {
225 token = match_token(p, tokens, args);
228 if (match_int(args, pipefd))
232 if (match_int(args, &option))
237 if (match_int(args, &option))
242 if (match_int(args, &option))
247 if (match_int(args, &option))
252 if (match_int(args, &option))
260 return (*pipefd < 0);
263 static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
265 struct autofs_info *ino;
267 ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755);
274 int autofs4_fill_super(struct super_block *s, void *data, int silent)
276 struct inode * root_inode;
277 struct dentry * root;
280 struct autofs_sb_info *sbi;
281 struct autofs_info *ino;
283 sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
286 DPRINTK("starting up, sbi = %p",sbi);
288 memset(sbi, 0, sizeof(*sbi));
291 sbi->magic = AUTOFS_SBI_MAGIC;
295 sbi->exp_timeout = 0;
296 sbi->oz_pgrp = process_group(current);
299 sbi->sub_version = 0;
302 mutex_init(&sbi->wq_mutex);
303 spin_lock_init(&sbi->fs_lock);
305 s->s_blocksize = 1024;
306 s->s_blocksize_bits = 10;
307 s->s_magic = AUTOFS_SUPER_MAGIC;
308 s->s_op = &autofs4_sops;
312 * Get the root inode and dentry, but defer checking for errors.
314 ino = autofs4_mkroot(sbi);
317 root_inode = autofs4_get_inode(s, ino);
322 root_inode->i_op = &autofs4_root_inode_operations;
323 root_inode->i_fop = &autofs4_root_operations;
324 root = d_alloc_root(root_inode);
330 /* Can this call block? */
331 if (parse_options(data, &pipefd,
332 &root_inode->i_uid, &root_inode->i_gid,
334 &sbi->min_proto, &sbi->max_proto)) {
335 printk("autofs: called with bogus options\n");
339 /* Couldn't this be tested earlier? */
340 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
341 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
342 printk("autofs: kernel does not match daemon version "
343 "daemon (%d, %d) kernel (%d, %d)\n",
344 sbi->min_proto, sbi->max_proto,
345 AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
349 /* Establish highest kernel protocol version */
350 if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
351 sbi->version = AUTOFS_MAX_PROTO_VERSION;
353 sbi->version = sbi->max_proto;
354 sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
356 DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
360 printk("autofs: could not open pipe file descriptor\n");
363 if ( !pipe->f_op || !pipe->f_op->write )
366 sbi->pipefd = pipefd;
369 * Take a reference to the root dentry so we get a chance to
370 * clean up the dentry tree on umount.
371 * See autofs4_force_release.
373 sbi->root = dget(root);
376 * Success! Install the root dentry now to indicate completion.
382 * Failure ... clean up.
385 printk("autofs: pipe file descriptor does not contain proper ops\n");
392 printk("autofs: get root dentry failed\n");
400 struct inode *autofs4_get_inode(struct super_block *sb,
401 struct autofs_info *inf)
403 struct inode *inode = new_inode(sb);
409 inode->i_mode = inf->mode;
411 inode->i_uid = sb->s_root->d_inode->i_uid;
412 inode->i_gid = sb->s_root->d_inode->i_gid;
417 inode->i_blksize = PAGE_CACHE_SIZE;
419 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
421 if (S_ISDIR(inf->mode)) {
423 inode->i_op = &autofs4_dir_inode_operations;
424 inode->i_fop = &autofs4_dir_operations;
425 } else if (S_ISLNK(inf->mode)) {
426 inode->i_size = inf->size;
427 inode->i_op = &autofs4_symlink_inode_operations;