1 files changed, 324 insertions, 0 deletions

diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
new file mode 100644
index 000000000000..a52560746628
--- /dev/null
+++ b/fs/autofs4/inode.c
@@ -0,0 +1,324 @@
+/* -*- 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/slab.h>
+#include <linux/file.h>
+#include <linux/pagemap.h>
+#include <linux/parser.h>
+#include <linux/bitops.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;
+
+        ino->flags = 0;
+        ino->mode = mode;
+        ino->inode = NULL;
+        ino->dentry = NULL;
+        ino->size = 0;
+
+        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)
+{
+        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);
+}
+
+static void autofs4_put_super(struct super_block *sb)
+{
+        struct autofs_sb_info *sbi = autofs4_sbi(sb);
+
+        sb->s_fs_info = NULL;
+
+        if ( !sbi->catatonic )
+                autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
+
+        kfree(sbi);
+
+        DPRINTK("shutting down");
+}
+
+static struct super_operations autofs4_sops = {
+        .put_super      = autofs4_put_super,
+        .statfs         = simple_statfs,
+};
+
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static 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_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 = 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;
+                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;
+}
+
+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;
+        int minproto, maxproto;
+
+        sbi = (struct autofs_sb_info *) kmalloc(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->catatonic = 0;
+        sbi->exp_timeout = 0;
+        sbi->oz_pgrp = process_group(current);
+        sbi->sb = s;
+        sbi->version = 0;
+        sbi->sub_version = 0;
+        init_MUTEX(&sbi->wq_sem);
+        sbi->queues = NULL;
+        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);
+        kfree(ino);
+        if (!root_inode)
+                goto fail_free;
+
+        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;
+
+        /* 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_MAX_PROTO_VERSION) {
+                printk("autofs: kernel does not match daemon version "
+                       "daemon (%d, %d) kernel (%d, %d)\n",
+                        minproto, maxproto,
+                        AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
+                goto fail_dput;
+        }
+
+        sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
+        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;
+
+        /*
+         * 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_free:
+        kfree(sbi);
+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_blksize = PAGE_CACHE_SIZE;
+        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;
+}