From: Ian Kent Date: Mon, 27 Mar 2006 09:14:55 +0000 (-0800) Subject: [PATCH] autofs4: add new packet type for v5 communications X-Git-Tag: v2.6.17-rc1~444 X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=5c0a32fc2cd0be912511199449a37a4a6f0f582d;p=linux-2.6-omap-h63xx.git [PATCH] autofs4: add new packet type for v5 communications 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 Cc: Al Viro Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index ed388a1d8fc..37c8d909d1e 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -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); diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c index b0bb9d43bcd..12da2c977b0 100644 --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -3,7 +3,7 @@ * linux/fs/autofs/waitq.c * * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved - * Copyright 2001-2003 Ian Kent + * Copyright 2001-2006 Ian Kent * * 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); diff --git a/include/linux/auto_fs4.h b/include/linux/auto_fs4.h index d998ddcf728..0a6bc52ffe8 100644 --- a/include/linux/auto_fs4.h +++ b/include/linux/auto_fs4.h @@ -19,18 +19,37 @@ #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)