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authorIan Kent <raven@themaw.net>2006-03-27 11:14:55 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 18:44:40 +0200
commit5c0a32fc2cd0be912511199449a37a4a6f0f582d (patch)
treef34ff979282bd957dee161e3668cc01b2dbd51ee /fs/autofs4
parent[PATCH] autofs4: add v5 expire logic (diff)
downloadlinux-5c0a32fc2cd0be912511199449a37a4a6f0f582d.tar.xz
linux-5c0a32fc2cd0be912511199449a37a4a6f0f582d.zip
[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 <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>
Diffstat (limited to 'fs/autofs4')
-rw-r--r--fs/autofs4/autofs_i.h23
-rw-r--r--fs/autofs4/waitq.c86
2 files changed, 90 insertions, 19 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index ed388a1d8fc4..37c8d909d1e9 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 b0bb9d43bcd9..12da2c977b0a 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 <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);