1 files changed, 86 insertions, 19 deletions

diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 2d3082854a29..fde78b110ddd 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -3,6 +3,7 @@
  * 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
@@ -13,6 +14,7 @@
 #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>
@@ -46,6 +48,7 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
         ino->size = 0;
 
         ino->last_used = jiffies;
+        atomic_set(&ino->count, 0);
 
         ino->sbi = sbi;
 
@@ -64,10 +67,19 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *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)
+                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)
@@ -145,20 +157,44 @@ static void autofs4_put_super(struct super_block *sb)
                 autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
 
         /* Clean up and release dangling references */
-        if (sbi)
-                autofs4_force_release(sbi);
+        autofs4_force_release(sbi);
 
         kfree(sbi);
 
         DPRINTK("shutting down");
 }
 
+static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+        struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
+
+        if (!sbi)
+                return 0;
+
+        seq_printf(m, ",fd=%d", sbi->pipefd);
+        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 struct super_operations autofs4_sops = {
         .put_super      = autofs4_put_super,
         .statfs         = simple_statfs,
+        .show_options   = autofs4_show_options,
 };
 
-enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
+        Opt_indirect, Opt_direct, Opt_offset};
 
 static match_table_t tokens = {
         {Opt_fd, "fd=%u"},
@@ -167,11 +203,15 @@ static match_table_t tokens = {
         {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, int *minproto, int *maxproto)
+                         pid_t *pgrp, unsigned int *type,
+                         int *minproto, int *maxproto)
 {
         char *p;
         substring_t args[MAX_OPT_ARGS];
@@ -225,6 +265,15 @@ static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
                                 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_DIRECT | AUTOFS_TYPE_OFFSET;
+                        break;
                 default:
                         return 1;
                 }
@@ -243,6 +292,10 @@ static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
         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;
@@ -251,7 +304,6 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         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 )
@@ -263,13 +315,17 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         s->s_fs_info = sbi;
         sbi->magic = AUTOFS_SBI_MAGIC;
         sbi->root = NULL;
+        sbi->pipefd = -1;
         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->type = 0;
+        sbi->min_proto = 0;
+        sbi->max_proto = 0;
+        mutex_init(&sbi->wq_mutex);
         spin_lock_init(&sbi->fs_lock);
         sbi->queues = NULL;
         s->s_blocksize = 1024;
@@ -285,38 +341,46 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         if (!ino)
                 goto fail_free;
         root_inode = autofs4_get_inode(s, ino);
-        kfree(ino);
         if (!root_inode)
-                goto fail_free;
+                goto fail_ino;
 
-        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;
+        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,
-                          &minproto, &maxproto)) {
+                          &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_DIRECT ?
+                        &autofs4_direct_root_inode_operations :
+                        &autofs4_indirect_root_inode_operations;
+
         /* Couldn't this be tested earlier? */
-        if (maxproto < AUTOFS_MIN_PROTO_VERSION ||
-            minproto > AUTOFS_MAX_PROTO_VERSION) {
+        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",
-                        minproto, maxproto,
+                        sbi->min_proto, sbi->max_proto,
                         AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
                 goto fail_dput;
         }
 
-        sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
+        /* 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);
@@ -329,6 +393,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         if ( !pipe->f_op || !pipe->f_op->write )
                 goto fail_fput;
         sbi->pipe = pipe;
+        sbi->pipefd = pipefd;
 
         /*
          * Take a reference to the root dentry so we get a chance to
@@ -356,6 +421,8 @@ fail_dput:
 fail_iput:
         printk("autofs: get root dentry failed\n");
         iput(root_inode);
+fail_ino:
+        kfree(ino);
 fail_free:
         kfree(sbi);
 fail_unlock: