[PATCH] autofs4: add new packet type for v5 communications
Ian Kent [Mon, 27 Mar 2006 09:14:55 +0000 (01:14 -0800)]
This patch define a new autofs packet for autofs v5 and updates the waitq.c
functions to handle the additional packet type.

Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/autofs4/autofs_i.h
fs/autofs4/waitq.c
include/linux/auto_fs4.h

index ed388a1..37c8d90 100644 (file)
@@ -77,6 +77,12 @@ struct autofs_wait_queue {
        int hash;
        int len;
        char *name;
+       u32 dev;
+       u64 ino;
+       uid_t uid;
+       gid_t gid;
+       pid_t pid;
+       pid_t tgid;
        /* This is for status reporting upon return */
        int status;
        atomic_t notified;
@@ -180,13 +186,6 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info
 
 /* Queue management functions */
 
-enum autofs_notify
-{
-       NFY_NONE,
-       NFY_MOUNT,
-       NFY_EXPIRE
-};
-
 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
 void autofs4_catatonic_mode(struct autofs_sb_info *);
@@ -204,6 +203,16 @@ static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **de
        return res;
 }
 
+static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
+{
+       return new_encode_dev(sbi->sb->s_dev);
+}
+
+static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
+{
+       return sbi->sb->s_root->d_inode->i_ino;
+}
+
 static inline int simple_positive(struct dentry *dentry)
 {
        return dentry->d_inode && !d_unhashed(dentry);
index b0bb9d4..12da2c9 100644 (file)
@@ -3,7 +3,7 @@
  * linux/fs/autofs/waitq.c
  *
  *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- *  Copyright 2001-2003 Ian Kent <raven@themaw.net>
+ *  Copyright 2001-2006 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
@@ -97,7 +97,10 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 
        pkt.hdr.proto_version = sbi->version;
        pkt.hdr.type = type;
-       if (type == autofs_ptype_missing) {
+       switch (type) {
+       /* Kernel protocol v4 missing and expire packets */
+       case autofs_ptype_missing:
+       {
                struct autofs_packet_missing *mp = &pkt.missing;
 
                pktsz = sizeof(*mp);
@@ -106,7 +109,10 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
                mp->len = wq->len;
                memcpy(mp->name, wq->name, wq->len);
                mp->name[wq->len] = '\0';
-       } else if (type == autofs_ptype_expire_multi) {
+               break;
+       }
+       case autofs_ptype_expire_multi:
+       {
                struct autofs_packet_expire_multi *ep = &pkt.expire_multi;
 
                pktsz = sizeof(*ep);
@@ -115,7 +121,34 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
                ep->len = wq->len;
                memcpy(ep->name, wq->name, wq->len);
                ep->name[wq->len] = '\0';
-       } else {
+               break;
+       }
+       /*
+        * Kernel protocol v5 packet for handling indirect and direct
+        * mount missing and expire requests
+        */
+       case autofs_ptype_missing_indirect:
+       case autofs_ptype_expire_indirect:
+       case autofs_ptype_missing_direct:
+       case autofs_ptype_expire_direct:
+       {
+               struct autofs_v5_packet *packet = &pkt.v5_packet;
+
+               pktsz = sizeof(*packet);
+
+               packet->wait_queue_token = wq->wait_queue_token;
+               packet->len = wq->len;
+               memcpy(packet->name, wq->name, wq->len);
+               packet->name[wq->len] = '\0';
+               packet->dev = wq->dev;
+               packet->ino = wq->ino;
+               packet->uid = wq->uid;
+               packet->gid = wq->gid;
+               packet->pid = wq->pid;
+               packet->tgid = wq->tgid;
+               break;
+       }
+       default:
                printk("autofs4_notify_daemon: bad type %d!\n", type);
                return;
        }
@@ -161,7 +194,9 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
 {
        struct autofs_wait_queue *wq;
        char *name;
-       int len, status;
+       unsigned int len = 0;
+       unsigned int hash = 0;
+       int status;
 
        /* In catatonic mode, we don't wait for nobody */
        if (sbi->catatonic)
@@ -171,11 +206,17 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
        if (!name)
                return -ENOMEM;
 
-       len = autofs4_getpath(sbi, dentry, &name);
-       if (!len) {
-               kfree(name);
-               return -ENOENT;
+       /* If this is a direct mount request create a dummy name */
+       if (IS_ROOT(dentry) && (sbi->type & AUTOFS_TYP_DIRECT))
+               len = sprintf(name, "%p", dentry);
+       else {
+               len = autofs4_getpath(sbi, dentry, &name);
+               if (!len) {
+                       kfree(name);
+                       return -ENOENT;
+               }
        }
+       hash = full_name_hash(name, len);
 
        if (mutex_lock_interruptible(&sbi->wq_mutex)) {
                kfree(name);
@@ -211,9 +252,15 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
                wq->next = sbi->queues;
                sbi->queues = wq;
                init_waitqueue_head(&wq->queue);
-               wq->hash = dentry->d_name.hash;
+               wq->hash = hash;
                wq->name = name;
                wq->len = len;
+               wq->dev = autofs4_get_dev(sbi);
+               wq->ino = autofs4_get_ino(sbi);
+               wq->uid = current->uid;
+               wq->gid = current->gid;
+               wq->pid = current->pid;
+               wq->tgid = current->tgid;
                wq->status = -EINTR; /* Status return if interrupted */
                atomic_set(&wq->wait_ctr, 2);
                atomic_set(&wq->notified, 1);
@@ -227,8 +274,23 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
        }
 
        if (notify != NFY_NONE && atomic_dec_and_test(&wq->notified)) {
-               int type = (notify == NFY_MOUNT ?
-                       autofs_ptype_missing : autofs_ptype_expire_multi);
+               int type;
+
+               if (sbi->version < 5) {
+                       if (notify == NFY_MOUNT)
+                               type = autofs_ptype_missing;
+                       else
+                               type = autofs_ptype_expire_multi;
+               } else {
+                       if (notify == NFY_MOUNT)
+                               type = (sbi->type & AUTOFS_TYP_DIRECT) ?
+                                       autofs_ptype_missing_direct :
+                                        autofs_ptype_missing_indirect;
+                       else
+                               type = (sbi->type & AUTOFS_TYP_DIRECT) ?
+                                       autofs_ptype_expire_direct :
+                                       autofs_ptype_expire_indirect;
+               }
 
                DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
                        (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify);
index d998ddc..0a6bc52 100644 (file)
 #undef AUTOFS_MIN_PROTO_VERSION
 #undef AUTOFS_MAX_PROTO_VERSION
 
-#define AUTOFS_PROTO_VERSION           4
+#define AUTOFS_PROTO_VERSION           5
 #define AUTOFS_MIN_PROTO_VERSION       3
-#define AUTOFS_MAX_PROTO_VERSION       4
+#define AUTOFS_MAX_PROTO_VERSION       5
 
-#define AUTOFS_PROTO_SUBVERSION                10
+#define AUTOFS_PROTO_SUBVERSION                0
 
 /* Mask for expire behaviour */
 #define AUTOFS_EXP_IMMEDIATE           1
 #define AUTOFS_EXP_LEAVES              2
 
-/* New message type */
-#define autofs_ptype_expire_multi      2       /* Expire entry (umount request) */
+/* Daemon notification packet types */
+enum autofs_notify {
+       NFY_NONE,
+       NFY_MOUNT,
+       NFY_EXPIRE
+};
+
+/* Kernel protocol version 4 packet types */
+
+/* Expire entry (umount request) */
+#define autofs_ptype_expire_multi      2
+
+/* Kernel protocol version 5 packet types */
+
+/* Indirect mount missing and expire requests. */
+#define autofs_ptype_missing_indirect  3
+#define autofs_ptype_expire_indirect   4
+
+/* Direct mount missing and expire requests */
+#define autofs_ptype_missing_direct    5
+#define autofs_ptype_expire_direct     6
 
 /* v4 multi expire (via pipe) */
 struct autofs_packet_expire_multi {
@@ -40,14 +59,36 @@ struct autofs_packet_expire_multi {
        char name[NAME_MAX+1];
 };
 
+/* autofs v5 common packet struct */
+struct autofs_v5_packet {
+       struct autofs_packet_hdr hdr;
+       autofs_wqt_t wait_queue_token;
+       __u32 dev;
+       __u64 ino;
+       __u32 uid;
+       __u32 gid;
+       __u32 pid;
+       __u32 tgid;
+       __u32 len;
+       char name[NAME_MAX+1];
+};
+
+typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
+typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
+typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
+typedef struct autofs_v5_packet autofs_packet_expire_direct_t;
+
 union autofs_packet_union {
        struct autofs_packet_hdr hdr;
        struct autofs_packet_missing missing;
        struct autofs_packet_expire expire;
        struct autofs_packet_expire_multi expire_multi;
+       struct autofs_v5_packet v5_packet;
 };
 
 #define AUTOFS_IOC_EXPIRE_MULTI                _IOW(0x93,0x66,int)
+#define AUTOFS_IOC_EXPIRE_INDIRECT     AUTOFS_IOC_EXPIRE_MULTI
+#define AUTOFS_IOC_EXPIRE_DIRECT       AUTOFS_IOC_EXPIRE_MULTI
 #define AUTOFS_IOC_PROTOSUBVER         _IOR(0x93,0x67,int)
 #define AUTOFS_IOC_ASKREGHOST           _IOR(0x93,0x68,int)
 #define AUTOFS_IOC_TOGGLEREGHOST        _IOR(0x93,0x69,int)