patch-2.3.41 linux/fs/autofs4/inode.c

• Lines: 424
• Date: Tue Jan 25 11:45:02 2000
• Orig file: v2.3.40/linux/fs/autofs4/inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.40/linux/fs/autofs4/inode.c linux/fs/autofs4/inode.c
@@ -0,0 +1,423 @@
+/* -*- 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/malloc.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 ino_lnkfree(struct autofs_info *ino)
+{
+	if (ino->u.symlink) {
+		kfree(ino->u.symlink);
+		ino->u.symlink = NULL;
+	}
+}
+
+struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
+				     struct autofs_sb_info *sbi, mode_t mode)
+{
+	int reinit = 1;
+
+	if (ino == NULL) {
+		reinit = 0;
+		ino = kmalloc(sizeof(*ino), GFP_KERNEL);
+	}
+
+	if (ino == NULL)
+		return NULL;
+
+	ino->flags = 0;
+	ino->ino = sbi->next_ino++;
+	ino->mode = mode;
+	ino->inode = NULL;
+	ino->dentry = NULL;
+	ino->size = 0;
+
+	ino->last_used = jiffies;
+
+	ino->sbi = sbi;
+	INIT_LIST_HEAD(&ino->ino_hash);
+
+	if (reinit && ino->free)
+		(ino->free)(ino);
+
+	memset(&ino->u, 0, sizeof(ino->u));
+
+	ino->free = NULL;
+
+	if (S_ISLNK(mode))
+		ino->free = ino_lnkfree;
+
+	return ino;
+}
+
+void autofs4_free_ino(struct autofs_info *ino)
+{
+	autofs4_ihash_delete(ino);
+	if (ino->dentry) {
+		ino->dentry->d_fsdata = NULL;
+		if (ino->dentry->d_inode)
+			dput(ino->dentry);
+		ino->dentry = NULL;
+	}
+	if (ino->free)
+		(ino->free)(ino);
+	kfree(ino);
+}
+
+/*
+ * Dummy functions - do we ever actually want to do
+ * something here?
+ */
+static void autofs4_put_inode(struct inode *inode)
+{
+}
+
+static void autofs4_clear_inode(struct inode *inode)
+{
+}
+
+static void autofs4_put_super(struct super_block *sb)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(sb);
+
+	sb->u.generic_sbp = NULL;
+
+	if ( !sbi->catatonic )
+		autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
+
+	kfree(sbi);
+
+	DPRINTK(("autofs: shutting down\n"));
+	
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif
+}
+
+static void autofs4_umount_begin(struct super_block *sb)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(sb);
+
+	if (!sbi->catatonic)
+		autofs4_catatonic_mode(sbi);
+}
+
+static int autofs4_statfs(struct super_block *sb, struct statfs *buf, int bufsiz);
+static void autofs4_read_inode(struct inode *inode);
+static void autofs4_write_inode(struct inode *inode);
+
+static struct super_operations autofs4_sops = {
+	read_inode:	autofs4_read_inode,
+	write_inode:	autofs4_write_inode,
+	put_inode:	autofs4_put_inode,
+	clear_inode:	autofs4_clear_inode,
+	put_super:	autofs4_put_super,
+	statfs:		autofs4_statfs,
+	umount_begin:	autofs4_umount_begin,
+};
+
+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);
+}
+
+static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
+{
+	struct autofs_info *ino;
+
+	ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755);
+	if (!ino)
+		return NULL;
+
+	ino->ino = AUTOFS_ROOT_INO;
+	
+	return ino;
+}
+
+struct super_block *autofs4_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;
+
+	MOD_INC_USE_COUNT;
+
+	lock_super(s);
+	/* Super block already completed? */
+	if (s->s_root)
+		goto out_unlock;
+
+	sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
+	if ( !sbi )
+		goto fail_unlock;
+	DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
+
+	memset(sbi, 0, sizeof(*sbi));
+
+	s->u.generic_sbp = sbi;
+	sbi->magic = AUTOFS_SBI_MAGIC;
+	sbi->catatonic = 0;
+	sbi->exp_timeout = 0;
+	sbi->oz_pgrp = current->pgrp;
+	sbi->sb = s;
+	sbi->version = 0;
+	autofs4_init_ihash(&sbi->ihash);
+	sbi->queues = NULL;
+	sbi->next_ino = AUTOFS_FIRST_INO;
+	s->s_blocksize = 1024;
+	s->s_blocksize_bits = 10;
+	s->s_magic = AUTOFS_SUPER_MAGIC;
+	s->s_op = &autofs4_sops;
+	s->s_root = NULL;
+	unlock_super(s); /* shouldn't we keep it locked a while longer? */
+
+	/*
+	 * Get the root inode and dentry, but defer checking for errors.
+	 */
+	autofs4_ihash_insert(&sbi->ihash, autofs4_mkroot(sbi));
+
+	root_inode = iget(s, AUTOFS_ROOT_INO);
+	root = d_alloc_root(root_inode);
+	pipe = NULL;
+
+	/*
+	 * Check whether somebody else completed the super block.
+	 */
+	if (s->s_root)
+		goto out_dput;
+
+	if (!root)
+		goto fail_iput;
+
+	/* Can this call block? */
+	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 (maxproto < AUTOFS_MIN_PROTO_VERSION ||
+	    minproto > AUTOFS_PROTO_VERSION) {
+		printk("autofs: kernel does not match daemon version "
+		       "daemon (%d, %d) kernel (%d, %d)\n",
+			minproto, maxproto,
+			AUTOFS_MIN_PROTO_VERSION, AUTOFS_PROTO_VERSION);
+		goto fail_dput;
+	}
+
+	sbi->version = maxproto > AUTOFS_PROTO_VERSION ? AUTOFS_PROTO_VERSION : maxproto;
+
+	DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
+	pipe = fget(pipefd);
+	/*
+	 * Check whether somebody else completed the super block.
+	 */
+	if (s->s_root)
+		goto out_fput;
+	
+	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;
+
+	/*
+	 * Success ... somebody else completed the super block for us. 
+	 */ 
+out_unlock:
+	unlock_super(s);
+	goto out_dec;
+out_fput:
+	if (pipe)
+		fput(pipe);
+out_dput:
+	if (root)
+		dput(root);
+	else
+		iput(root_inode);
+out_dec:
+	MOD_DEC_USE_COUNT;
+	return s;
+	
+	/*
+	 * Failure ... clear the s_dev slot and clean up.
+	 */
+fail_fput:
+	printk("autofs: pipe file descriptor does not contain proper ops\n");
+	/*
+	 * fput() can block, so we clear the super block first.
+	 */
+	s->s_dev = 0;
+	fput(pipe);
+	/* fall through */
+fail_dput:
+	/*
+	 * dput() can block, so we clear the super block first.
+	 */
+	s->s_dev = 0;
+	dput(root);
+	goto fail_free;
+fail_iput:
+	printk("autofs: get root dentry failed\n");
+	/*
+	 * iput() can block, so we clear the super block first.
+	 */
+	s->s_dev = 0;
+	iput(root_inode);
+fail_free:
+	kfree(sbi);
+	goto fail_dec;
+fail_unlock:
+	unlock_super(s);
+fail_dec:
+	s->s_dev = 0;
+	MOD_DEC_USE_COUNT;
+	return NULL;
+}
+
+static int autofs4_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
+{
+	struct statfs tmp;
+
+	tmp.f_type = AUTOFS_SUPER_MAGIC;
+	tmp.f_bsize = 1024;
+	tmp.f_blocks = 0;
+	tmp.f_bfree = 0;
+	tmp.f_bavail = 0;
+	tmp.f_files = 0;
+	tmp.f_ffree = 0;
+	tmp.f_namelen = NAME_MAX;
+	return copy_to_user(buf, &tmp, bufsiz) ? -EFAULT : 0;
+}
+
+static void autofs4_read_inode(struct inode *inode)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
+	struct autofs_info *inf;
+
+	inf = autofs4_ihash_find(&sbi->ihash, inode->i_ino);
+
+	if (inf == NULL || inf->inode != NULL)
+		return;
+
+	inode->i_mode = inf->mode;
+	inode->i_mtime = inode->i_ctime = inode->i_atime = CURRENT_TIME;
+	inode->i_size = inf->size;
+
+	inode->i_blocks = 0;
+	inode->i_blksize = 0;
+	inode->i_nlink = 1;
+
+	if (inode->i_sb->s_root) {
+		inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
+		inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
+	} else {
+		inode->i_uid = 0;
+		inode->i_gid = 0;
+	}
+
+	inf->inode = inode;
+
+	if (S_ISDIR(inf->mode)) {
+		inode->i_nlink = 2;
+		if (inode->i_ino == AUTOFS_ROOT_INO)
+			inode->i_op = &autofs4_root_inode_operations;
+		else
+			inode->i_op = &autofs4_dir_inode_operations;
+	} else if (S_ISLNK(inf->mode)) {
+		inode->i_op = &autofs4_symlink_inode_operations;
+	}
+}
+
+static void autofs4_write_inode(struct inode *inode)
+{
+}