Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 475 insertions, 0 deletions

diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
new file mode 100644
index 0000000..c7e65bb
--- /dev/null
+++ b/fs/autofs4/inode.c
@@ -0,0 +1,475 @@
+/* -*- c -*- --------------------------------------------------------------- *
+ *
+ * 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
+ * option, any later version, incorporated herein by reference.
+ *
+ * ------------------------------------------------------------------------- */
+
+#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/magic.h>
+#include "autofs_i.h"
+#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;
+
+	if (!reinit) {
+		ino->flags = 0;
+		ino->inode = NULL;
+		ino->dentry = NULL;
+		ino->size = 0;
+		INIT_LIST_HEAD(&ino->active);
+		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;
+
+	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)
+{
+	struct autofs_info *p_ino;
+
+	if (ino->dentry) {
+		ino->dentry->d_fsdata = NULL;
+		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)
+		(ino->free)(ino);
+	kfree(ino);
+}
+
+/*
+ * Deal with the infamous "Busy inodes after umount ..." message.
+ *
+ * Clean up the dentry tree. This happens with autofs if the user
+ * space program goes away due to a SIGKILL, SIGSEGV etc.
+ */
+static void autofs4_force_release(struct autofs_sb_info *sbi)
+{
+	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;
+resume:
+	while (next != &this_parent->d_subdirs) {
+		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
+
+		/* Negative dentry - don`t care */
+		if (!simple_positive(dentry)) {
+			next = next->next;
+			continue;
+		}
+
+		if (!list_empty(&dentry->d_subdirs)) {
+			this_parent = dentry;
+			goto repeat;
+		}
+
+		next = next->next;
+		spin_unlock(&dcache_lock);
+
+		DPRINTK("dentry %p %.*s",
+			dentry, (int)dentry->d_name.len, dentry->d_name.name);
+
+		dput(dentry);
+		spin_lock(&dcache_lock);
+	}
+
+	if (this_parent != sbi->sb->s_root) {
+		struct dentry *dentry = this_parent;
+
+		next = this_parent->d_u.d_child.next;
+		this_parent = this_parent->d_parent;
+		spin_unlock(&dcache_lock);
+		DPRINTK("parent dentry %p %.*s",
+			dentry, (int)dentry->d_name.len, dentry->d_name.name);
+		dput(dentry);
+		spin_lock(&dcache_lock);
+		goto resume;
+	}
+	spin_unlock(&dcache_lock);
+}
+
+void autofs4_kill_sb(struct super_block *sb)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(sb);
+
+	/*
+	 * 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;
+
+	/* Free wait queues, close pipe */
+	autofs4_catatonic_mode(sbi);
+
+	/* Clean up and release dangling references */
+	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 (sbi->type & AUTOFS_TYPE_OFFSET)
+		seq_printf(m, ",offset");
+	else if (sbi->type & AUTOFS_TYPE_DIRECT)
+		seq_printf(m, ",direct");
+	else
+		seq_printf(m, ",indirect");
+
+	return 0;
+}
+
+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,
+	Opt_indirect, Opt_direct, Opt_offset};
+
+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, unsigned int *type, int *minproto, int *maxproto)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
+
+	*uid = current->uid;
+	*gid = current->gid;
+	*pgrp = task_pgrp_nr(current);
+
+	*minproto = AUTOFS_MIN_PROTO_VERSION;
+	*maxproto = AUTOFS_MAX_PROTO_VERSION;
+
+	*pipefd = -1;
+
+	if (!options)
+		return 1;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_fd:
+			if (match_int(args, pipefd))
+				return 1;
+			break;
+		case Opt_uid:
+			if (match_int(args, &option))
+				return 1;
+			*uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
+				return 1;
+			*gid = option;
+			break;
+		case Opt_pgrp:
+			if (match_int(args, &option))
+				return 1;
+			*pgrp = option;
+			break;
+		case Opt_minproto:
+			if (match_int(args, &option))
+				return 1;
+			*minproto = option;
+			break;
+		case Opt_maxproto:
+			if (match_int(args, &option))
+				return 1;
+			*maxproto = option;
+			break;
+		case Opt_indirect:
+			*type = AUTOFS_TYPE_INDIRECT;
+			break;
+		case Opt_direct:
+			*type = AUTOFS_TYPE_DIRECT;
+			break;
+		case Opt_offset:
+			*type = AUTOFS_TYPE_OFFSET;
+			break;
+		default:
+			return 1;
+		}
+	}
+	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;
+
+	return ino;
+}
+
+static 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;
+	struct dentry * root;
+	struct file * pipe;
+	int pipefd;
+	struct autofs_sb_info *sbi;
+	struct autofs_info *ino;
+
+	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+	if (!sbi)
+		goto fail_unlock;
+	DPRINTK("starting up, sbi = %p",sbi);
+
+	s->s_fs_info = sbi;
+	sbi->magic = AUTOFS_SBI_MAGIC;
+	sbi->pipefd = -1;
+	sbi->pipe = NULL;
+	sbi->catatonic = 1;
+	sbi->exp_timeout = 0;
+	sbi->oz_pgrp = task_pgrp_nr(current);
+	sbi->sb = s;
+	sbi->version = 0;
+	sbi->sub_version = 0;
+	sbi->type = AUTOFS_TYPE_INDIRECT;
+	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;
+	s->s_op = &autofs4_sops;
+	s->s_time_gran = 1;
+
+	/*
+	 * Get the root inode and dentry, but defer checking for errors.
+	 */
+	ino = autofs4_mkroot(sbi);
+	if (!ino)
+		goto fail_free;
+	root_inode = autofs4_get_inode(s, ino);
+	if (!root_inode)
+		goto fail_ino;
+
+	root = d_alloc_root(root_inode);
+	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, &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 = sbi->type & AUTOFS_TYPE_TRIGGER ?
+			&autofs4_direct_root_inode_operations :
+			&autofs4_indirect_root_inode_operations;
+
+	/* Couldn't this be tested earlier? */
+	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",
+			sbi->min_proto, sbi->max_proto,
+			AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
+		goto fail_dput;
+	}
+
+	/* 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) {
+		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;
+	sbi->pipefd = pipefd;
+	sbi->catatonic = 0;
+
+	/*
+	 * Success! Install the root dentry now to indicate completion.
+	 */
+	s->s_root = root;
+	return 0;
+	
+	/*
+	 * Failure ... clean up.
+	 */
+fail_fput:
+	printk("autofs: pipe file descriptor does not contain proper ops\n");
+	fput(pipe);
+	/* fall through */
+fail_dput:
+	dput(root);
+	goto fail_free;
+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;
+}
+
+struct inode *autofs4_get_inode(struct super_block *sb,
+				struct autofs_info *inf)
+{
+	struct inode *inode = new_inode(sb);
+
+	if (inode == NULL)
+		return NULL;
+
+	inf->inode = inode;
+	inode->i_mode = inf->mode;
+	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_blocks = 0;
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+	if (S_ISDIR(inf->mode)) {
+		inode->i_nlink = 2;
+		inode->i_op = &autofs4_dir_inode_operations;
+		inode->i_fop = &autofs4_dir_operations;
+	} else if (S_ISLNK(inf->mode)) {
+		inode->i_size = inf->size;
+		inode->i_op = &autofs4_symlink_inode_operations;
+	}
+
+	return inode;
+}