1 files changed, 250 insertions, 0 deletions

diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
new file mode 100644
index 000000000000..4888c1fabbf7
--- /dev/null
+++ b/fs/autofs/inode.c
@@ -0,0 +1,250 @@
+/* -*- 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/mm.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/parser.h>
+#include <linux/bitops.h>
+#include "autofs_i.h"
+#include <linux/module.h>
+
+static void autofs_put_super(struct super_block *sb)
+{
+        struct autofs_sb_info *sbi = autofs_sbi(sb);
+        unsigned int n;
+
+        if ( !sbi->catatonic )
+                autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
+
+        autofs_hash_nuke(&sbi->dirhash);
+        for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
+                if ( test_bit(n, sbi->symlink_bitmap) )
+                        kfree(sbi->symlink[n].data);
+        }
+
+        kfree(sb->s_fs_info);
+
+        DPRINTK(("autofs: shutting down\n"));
+}
+
+static void autofs_read_inode(struct inode *inode);
+
+static struct super_operations autofs_sops = {
+        .read_inode     = autofs_read_inode,
+        .put_super      = autofs_put_super,
+        .statfs         = simple_statfs,
+};
+
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static match_table_t autofs_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 = *maxproto = AUTOFS_PROTO_VERSION;
+
+        *pipefd = -1;
+
+        if (!options)
+                return 1;
+
+        while ((p = strsep(&options, ",")) != NULL) {
+                int token;
+                if (!*p)
+                        continue;
+
+                token = match_token(p, autofs_tokens, args);
+                switch (token) {
+                case Opt_fd:
+                        if (match_int(&args[0], &option))
+                                return 1;
+                        *pipefd = option;
+                        break;
+                case Opt_uid:
+                        if (match_int(&args[0], &option))
+                                return 1;
+                        *uid = option;
+                        break;
+                case Opt_gid:
+                        if (match_int(&args[0], &option))
+                                return 1;
+                        *gid = option;
+                        break;
+                case Opt_pgrp:
+                        if (match_int(&args[0], &option))
+                                return 1;
+                        *pgrp = option;
+                        break;
+                case Opt_minproto:
+                        if (match_int(&args[0], &option))
+                                return 1;
+                        *minproto = option;
+                        break;
+                case Opt_maxproto:
+                        if (match_int(&args[0], &option))
+                                return 1;
+                        *maxproto = option;
+                        break;
+                default:
+                        return 1;
+                }
+        }
+        return (*pipefd < 0);
+}
+
+int autofs_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;
+        int minproto, maxproto;
+
+        sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
+        if ( !sbi )
+                goto fail_unlock;
+        memset(sbi, 0, sizeof(*sbi));
+        DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
+
+        s->s_fs_info = sbi;
+        sbi->magic = AUTOFS_SBI_MAGIC;
+        sbi->catatonic = 0;
+        sbi->exp_timeout = 0;
+        sbi->oz_pgrp = process_group(current);
+        autofs_initialize_hash(&sbi->dirhash);
+        sbi->queues = NULL;
+        memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
+        sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
+        s->s_blocksize = 1024;
+        s->s_blocksize_bits = 10;
+        s->s_magic = AUTOFS_SUPER_MAGIC;
+        s->s_op = &autofs_sops;
+        s->s_time_gran = 1;
+
+        root_inode = iget(s, AUTOFS_ROOT_INO);
+        root = d_alloc_root(root_inode);
+        pipe = NULL;
+
+        if (!root)
+                goto fail_iput;
+
+        /* Can this call block?  - WTF cares? s is locked. */
+        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 ( minproto > AUTOFS_PROTO_VERSION || 
+             maxproto < AUTOFS_PROTO_VERSION ) {
+                printk("autofs: kernel does not match daemon version\n");
+                goto fail_dput;
+        }
+
+        DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", 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;
+
+fail_fput:
+        printk("autofs: pipe file descriptor does not contain proper ops\n");
+        fput(pipe);
+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;
+}
+
+static void autofs_read_inode(struct inode *inode)
+{
+        ino_t ino = inode->i_ino;
+        unsigned int n;
+        struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
+
+        /* Initialize to the default case (stub directory) */
+
+        inode->i_op = &simple_dir_inode_operations;
+        inode->i_fop = &simple_dir_operations;
+        inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+        inode->i_nlink = 2;
+        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+        inode->i_blocks = 0;
+        inode->i_blksize = 1024;
+
+        if ( ino == AUTOFS_ROOT_INO ) {
+                inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
+                inode->i_op = &autofs_root_inode_operations;
+                inode->i_fop = &autofs_root_operations;
+                inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
+                return;
+        } 
+        
+        inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
+        inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
+        
+        if ( ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO ) {
+                /* Symlink inode - should be in symlink list */
+                struct autofs_symlink *sl;
+
+                n = ino - AUTOFS_FIRST_SYMLINK;
+                if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
+                        printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
+                        return;
+                }
+                
+                inode->i_op = &autofs_symlink_inode_operations;
+                sl = &sbi->symlink[n];
+                inode->u.generic_ip = sl;
+                inode->i_mode = S_IFLNK | S_IRWXUGO;
+                inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
+                inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
+                inode->i_size = sl->len;
+                inode->i_nlink = 1;
+        }
+}