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Commit 7cee9384 authored by Linus Torvalds's avatar Linus Torvalds
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Fix up over-eager 'wait_queue_t' renaming 



Commit ac6424b9 ("sched/wait: Rename wait_queue_t =>
wait_queue_entry_t") had scripted the renaming incorrectly, and didn't
actually check that the 'wait_queue_t' was a full token.

As a result, it also triggered on 'wait_queue_token', and renamed that
to 'wait_queue_entry_token' entry in the autofs4 packet structure
definition too.  That was entirely incorrect, and not intended.

The end result built fine when building just the kernel - because
everything had been renamed consistently there - but caused problems in
user space because the "struct autofs_packet_missing" type is exported
as part of the uapi.

This scripts it all back again:

    git grep -lw wait_queue_entry_token |
        xargs sed -i 's/wait_queue_entry_token/wait_queue_token/g'

and checks the end result.

Reported-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Fixes: ac6424b9 ("sched/wait: Rename wait_queue_t => wait_queue_entry_t")
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9eb78880

Documentation/filesystems/autofs4.txt

+6 −6
Original line number Diff line number Diff line
@@ -316,7 +316,7 @@ For version 5, the format of the message is: 
        struct autofs_v5_packet {

                int proto_version;                /* Protocol version */

                int type;                        /* Type of packet */

                autofs_wqt_t wait_queue_entry_token;

                autofs_wqt_t wait_queue_token;

                __u32 dev;

                __u64 ino;

                __u32 uid;
@@ -341,12 +341,12 @@ The pipe will be set to "packet mode" (equivalent to passing 
`O_DIRECT`) to _pipe2(2)_ so that a read from the pipe will return at

most one packet, and any unread portion of a packet will be discarded.



The `wait_queue_entry_token` is a unique number which can identify a

The `wait_queue_token` is a unique number which can identify a

particular request to be acknowledged.  When a message is sent over

the pipe the affected dentry is marked as either "active" or

"expiring" and other accesses to it block until the message is

acknowledged using one of the ioctls below and the relevant

`wait_queue_entry_token`.

`wait_queue_token`.



Communicating with autofs: root directory ioctls

------------------------------------------------
@@ -358,7 +358,7 @@ capability, or must be the automount daemon. 
The available ioctl commands are:



- **AUTOFS_IOC_READY**: a notification has been handled.  The argument

    to the ioctl command is the "wait_queue_entry_token" number

    to the ioctl command is the "wait_queue_token" number

    corresponding to the notification being acknowledged.

- **AUTOFS_IOC_FAIL**: similar to above, but indicates failure with

    the error code `ENOENT`.
@@ -382,14 +382,14 @@ The available ioctl commands are: 
        struct autofs_packet_expire_multi {

                int proto_version;              /* Protocol version */

                int type;                       /* Type of packet */

                autofs_wqt_t wait_queue_entry_token;

                autofs_wqt_t wait_queue_token;

                int len;

                char name[NAME_MAX+1];

        };



     is required.  This is filled in with the name of something

     that can be unmounted or removed.  If nothing can be expired,

     `errno` is set to `EAGAIN`.  Even though a `wait_queue_entry_token`

     `errno` is set to `EAGAIN`.  Even though a `wait_queue_token`

     is present in the structure, no "wait queue" is established

     and no acknowledgment is needed.

- **AUTOFS_IOC_EXPIRE_MULTI**:  This is similar to

fs/autofs4/autofs_i.h

+1 −1
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ struct autofs_info { 
struct autofs_wait_queue {

	wait_queue_head_t queue;

	struct autofs_wait_queue *next;

	autofs_wqt_t wait_queue_entry_token;

	autofs_wqt_t wait_queue_token;

	/* We use the following to see what we are waiting for */

	struct qstr name;

	u32 dev;

fs/autofs4/waitq.c

+9 −9
Original line number Diff line number Diff line
@@ -104,7 +104,7 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi, 
	size_t pktsz;



	pr_debug("wait id = 0x%08lx, name = %.*s, type=%d\n",

		 (unsigned long) wq->wait_queue_entry_token,

		 (unsigned long) wq->wait_queue_token,

		 wq->name.len, wq->name.name, type);



	memset(&pkt, 0, sizeof(pkt)); /* For security reasons */
@@ -120,7 +120,7 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi, 


		pktsz = sizeof(*mp);



		mp->wait_queue_entry_token = wq->wait_queue_entry_token;

		mp->wait_queue_token = wq->wait_queue_token;

		mp->len = wq->name.len;

		memcpy(mp->name, wq->name.name, wq->name.len);

		mp->name[wq->name.len] = '\0';
@@ -133,7 +133,7 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi, 


		pktsz = sizeof(*ep);



		ep->wait_queue_entry_token = wq->wait_queue_entry_token;

		ep->wait_queue_token = wq->wait_queue_token;

		ep->len = wq->name.len;

		memcpy(ep->name, wq->name.name, wq->name.len);

		ep->name[wq->name.len] = '\0';
@@ -153,7 +153,7 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi, 


		pktsz = sizeof(*packet);



		packet->wait_queue_entry_token = wq->wait_queue_entry_token;

		packet->wait_queue_token = wq->wait_queue_token;

		packet->len = wq->name.len;

		memcpy(packet->name, wq->name.name, wq->name.len);

		packet->name[wq->name.len] = '\0';
@@ -428,7 +428,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, 
			return -ENOMEM;

		}



		wq->wait_queue_entry_token = autofs4_next_wait_queue;

		wq->wait_queue_token = autofs4_next_wait_queue;

		if (++autofs4_next_wait_queue == 0)

			autofs4_next_wait_queue = 1;

		wq->next = sbi->queues;
@@ -461,7 +461,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, 
		}



		pr_debug("new wait id = 0x%08lx, name = %.*s, nfy=%d\n",

			 (unsigned long) wq->wait_queue_entry_token, wq->name.len,

			 (unsigned long) wq->wait_queue_token, wq->name.len,

			 wq->name.name, notify);



		/*
@@ -471,7 +471,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, 
	} else {

		wq->wait_ctr++;

		pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n",

			 (unsigned long) wq->wait_queue_entry_token, wq->name.len,

			 (unsigned long) wq->wait_queue_token, wq->name.len,

			 wq->name.name, notify);

		mutex_unlock(&sbi->wq_mutex);

		kfree(qstr.name);
@@ -550,13 +550,13 @@ int autofs4_wait(struct autofs_sb_info *sbi, 
}





int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_entry_token, int status)

int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status)

{

	struct autofs_wait_queue *wq, **wql;



	mutex_lock(&sbi->wq_mutex);

	for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {

		if (wq->wait_queue_entry_token == wait_queue_entry_token)

		if (wq->wait_queue_token == wait_queue_token)

			break;

	}

include/uapi/linux/auto_fs.h

+2 −2
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ 
#define AUTOFS_MIN_PROTO_VERSION	AUTOFS_PROTO_VERSION



/*

 * The wait_queue_entry_token (autofs_wqt_t) is part of a structure which is passed

 * The wait_queue_token (autofs_wqt_t) is part of a structure which is passed

 * back to the kernel via ioctl from userspace. On architectures where 32- and

 * 64-bit userspace binaries can be executed it's important that the size of

 * autofs_wqt_t stays constant between 32- and 64-bit Linux kernels so that we
@@ -49,7 +49,7 @@ struct autofs_packet_hdr { 


struct autofs_packet_missing {

	struct autofs_packet_hdr hdr;

	autofs_wqt_t wait_queue_entry_token;

	autofs_wqt_t wait_queue_token;

	int len;

	char name[NAME_MAX+1];

};

include/uapi/linux/auto_fs4.h

+2 −2
Original line number Diff line number Diff line
@@ -108,7 +108,7 @@ enum autofs_notify { 
/* v4 multi expire (via pipe) */

struct autofs_packet_expire_multi {

	struct autofs_packet_hdr hdr;

	autofs_wqt_t wait_queue_entry_token;

	autofs_wqt_t wait_queue_token;

	int len;

	char name[NAME_MAX+1];

};
@@ -123,7 +123,7 @@ union autofs_packet_union { 
/* autofs v5 common packet struct */

struct autofs_v5_packet {

	struct autofs_packet_hdr hdr;

	autofs_wqt_t wait_queue_entry_token;

	autofs_wqt_t wait_queue_token;

	__u32 dev;

	__u64 ino;

	__u32 uid;