[PATCH] fuse: add request interruption (a4d27e75) · Commits · 戴 / test

Documentation/filesystems/fuse.txt

+44 −4

Original line number	Diff line number	Diff line
		@@ -124,6 +124,46 @@ For each connection the following files exist within this directory:

		Only the owner of the mount may read or write these files.

		Interrupting filesystem operations
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

		If a process issuing a FUSE filesystem request is interrupted, the
		following will happen:

		1) If the request is not yet sent to userspace AND the signal is
		fatal (SIGKILL or unhandled fatal signal), then the request is
		dequeued and returns immediately.

		2) If the request is not yet sent to userspace AND the signal is not
		fatal, then an 'interrupted' flag is set for the request. When
		the request has been successfully transfered to userspace and
		this flag is set, an INTERRUPT request is queued.

		3) If the request is already sent to userspace, then an INTERRUPT
		request is queued.

		INTERRUPT requests take precedence over other requests, so the
		userspace filesystem will receive queued INTERRUPTs before any others.

		The userspace filesystem may ignore the INTERRUPT requests entirely,
		or may honor them by sending a reply to the _original_ request, with
		the error set to EINTR.

		It is also possible that there's a race between processing the
		original request and it's INTERRUPT request. There are two possibilities:

		1) The INTERRUPT request is processed before the original request is
		processed

		2) The INTERRUPT request is processed after the original request has
		been answered

		If the filesystem cannot find the original request, it should wait for
		some timeout and/or a number of new requests to arrive, after which it
		should reply to the INTERRUPT request with an EAGAIN error. In case
		1) the INTERRUPT request will be requeued. In case 2) the INTERRUPT
		reply will be ignored.

		Aborting a filesystem connection
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

		@@ -351,10 +391,10 @@ but is caused by a pagefault.

		Solution is basically the same as above.

		An additional problem is that while the write buffer is being
		copied to the request, the request must not be interrupted. This
		is because the destination address of the copy may not be valid
		after the request is interrupted.
		An additional problem is that while the write buffer is being copied
		to the request, the request must not be interrupted/aborted. This is
		because the destination address of the copy may not be valid after the
		request has returned.

		This is solved with doing the copy atomically, and allowing abort
		while the page(s) belonging to the write buffer are faulted with

fs/fuse/dev.c

+135 −27

Original line number	Diff line number	Diff line
		@@ -34,6 +34,7 @@ static void fuse_request_init(struct fuse_req *req)
		{
		memset(req, 0, sizeof(*req));
		INIT_LIST_HEAD(&req->list);
		INIT_LIST_HEAD(&req->intr_entry);
		init_waitqueue_head(&req->waitq);
		atomic_set(&req->count, 1);
		}
		@@ -215,6 +216,7 @@ static void request_end(struct fuse_conn fc, struct fuse_req req)
		void (end) (struct fuse_conn , struct fuse_req *) = req->end;
		req->end = NULL;
		list_del(&req->list);
		list_del(&req->intr_entry);
		req->state = FUSE_REQ_FINISHED;
		if (req->background) {
		if (fc->num_background == FUSE_MAX_BACKGROUND) {
		@@ -235,28 +237,63 @@ static void request_end(struct fuse_conn fc, struct fuse_req req)
		fuse_put_request(fc, req);
		}

		static void wait_answer_interruptible(struct fuse_conn *fc,
		struct fuse_req *req)
		{
		if (signal_pending(current))
		return;

		spin_unlock(&fc->lock);
		wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED);
		spin_lock(&fc->lock);
		}

		static void queue_interrupt(struct fuse_conn fc, struct fuse_req req)
		{
		list_add_tail(&req->intr_entry, &fc->interrupts);
		wake_up(&fc->waitq);
		kill_fasync(&fc->fasync, SIGIO, POLL_IN);
		}

		/* Called with fc->lock held. Releases, and then reacquires it. */
		static void request_wait_answer(struct fuse_conn fc, struct fuse_req req)
		{
		sigset_t oldset;
		if (!fc->no_interrupt) {
		/* Any signal may interrupt this */
		wait_answer_interruptible(fc, req);

		if (req->aborted)
		goto aborted;
		if (req->state == FUSE_REQ_FINISHED)
		return;

		req->interrupted = 1;
		if (req->state == FUSE_REQ_SENT)
		queue_interrupt(fc, req);
		}

		if (req->force) {
		spin_unlock(&fc->lock);
		if (req->force)
		wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);
		else {
		spin_lock(&fc->lock);
		} else {
		sigset_t oldset;

		/* Only fatal signals may interrupt this */
		block_sigs(&oldset);
		wait_event_interruptible(req->waitq,
		req->state == FUSE_REQ_FINISHED);
		wait_answer_interruptible(fc, req);
		restore_sigs(&oldset);
		}
		spin_lock(&fc->lock);
		if (req->state == FUSE_REQ_FINISHED && !req->aborted)

		if (req->aborted)
		goto aborted;
		if (req->state == FUSE_REQ_FINISHED)
		return;

		if (!req->aborted) {
		req->out.h.error = -EINTR;
		req->aborted = 1;
		}

		aborted:
		if (req->locked) {
		/* This is uninterruptible sleep, because data is
		being copied to/from the buffers of req. During
		@@ -288,13 +325,19 @@ static unsigned len_args(unsigned numargs, struct fuse_arg *args)
		return nbytes;
		}

		static void queue_request(struct fuse_conn fc, struct fuse_req req)
		static u64 fuse_get_unique(struct fuse_conn *fc)
		{
		fc->reqctr++;
		/* zero is special */
		if (fc->reqctr == 0)
		fc->reqctr = 1;
		req->in.h.unique = fc->reqctr;

		return fc->reqctr;
		}

		static void queue_request(struct fuse_conn fc, struct fuse_req req)
		{
		req->in.h.unique = fuse_get_unique(fc);
		req->in.h.len = sizeof(struct fuse_in_header) +
		len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
		list_add_tail(&req->list, &fc->pending);
		@@ -307,9 +350,6 @@ static void queue_request(struct fuse_conn fc, struct fuse_req req)
		kill_fasync(&fc->fasync, SIGIO, POLL_IN);
		}

		/*
		* This can only be interrupted by a SIGKILL
		*/
		void request_send(struct fuse_conn fc, struct fuse_req req)
		{
		req->isreply = 1;
		@@ -566,13 +606,18 @@ static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs,
		return err;
		}

		static int request_pending(struct fuse_conn *fc)
		{
		return !list_empty(&fc->pending) \|\| !list_empty(&fc->interrupts);
		}

		/* Wait until a request is available on the pending list */
		static void request_wait(struct fuse_conn *fc)
		{
		DECLARE_WAITQUEUE(wait, current);

		add_wait_queue_exclusive(&fc->waitq, &wait);
		while (fc->connected && list_empty(&fc->pending)) {
		while (fc->connected && !request_pending(fc)) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (signal_pending(current))
		break;
		@@ -585,6 +630,45 @@ static void request_wait(struct fuse_conn *fc)
		remove_wait_queue(&fc->waitq, &wait);
		}

		/*
		* Transfer an interrupt request to userspace
		*
		* Unlike other requests this is assembled on demand, without a need
		* to allocate a separate fuse_req structure.
		*
		* Called with fc->lock held, releases it
		*/
		static int fuse_read_interrupt(struct fuse_conn fc, struct fuse_req req,
		const struct iovec *iov, unsigned long nr_segs)
		{
		struct fuse_copy_state cs;
		struct fuse_in_header ih;
		struct fuse_interrupt_in arg;
		unsigned reqsize = sizeof(ih) + sizeof(arg);
		int err;

		list_del_init(&req->intr_entry);
		req->intr_unique = fuse_get_unique(fc);
		memset(&ih, 0, sizeof(ih));
		memset(&arg, 0, sizeof(arg));
		ih.len = reqsize;
		ih.opcode = FUSE_INTERRUPT;
		ih.unique = req->intr_unique;
		arg.unique = req->in.h.unique;

		spin_unlock(&fc->lock);
		if (iov_length(iov, nr_segs) < reqsize)
		return -EINVAL;

		fuse_copy_init(&cs, fc, 1, NULL, iov, nr_segs);
		err = fuse_copy_one(&cs, &ih, sizeof(ih));
		if (!err)
		err = fuse_copy_one(&cs, &arg, sizeof(arg));
		fuse_copy_finish(&cs);

		return err ? err : reqsize;
		}

		/*
		* Read a single request into the userspace filesystem's buffer. This
		* function waits until a request is available, then removes it from
		@@ -610,7 +694,7 @@ static ssize_t fuse_dev_readv(struct file file, const struct iovec iov,
		spin_lock(&fc->lock);
		err = -EAGAIN;
		if ((file->f_flags & O_NONBLOCK) && fc->connected &&
		list_empty(&fc->pending))
		!request_pending(fc))
		goto err_unlock;

		request_wait(fc);
		@@ -618,9 +702,15 @@ static ssize_t fuse_dev_readv(struct file file, const struct iovec iov,
		if (!fc->connected)
		goto err_unlock;
		err = -ERESTARTSYS;
		if (list_empty(&fc->pending))
		if (!request_pending(fc))
		goto err_unlock;

		if (!list_empty(&fc->interrupts)) {
		req = list_entry(fc->interrupts.next, struct fuse_req,
		intr_entry);
		return fuse_read_interrupt(fc, req, iov, nr_segs);
		}

		req = list_entry(fc->pending.next, struct fuse_req, list);
		req->state = FUSE_REQ_READING;
		list_move(&req->list, &fc->io);
		@@ -658,6 +748,8 @@ static ssize_t fuse_dev_readv(struct file file, const struct iovec iov,
		else {
		req->state = FUSE_REQ_SENT;
		list_move_tail(&req->list, &fc->processing);
		if (req->interrupted)
		queue_interrupt(fc, req);
		spin_unlock(&fc->lock);
		}
		return reqsize;
		@@ -684,7 +776,7 @@ static struct fuse_req request_find(struct fuse_conn fc, u64 unique)
		list_for_each(entry, &fc->processing) {
		struct fuse_req *req;
		req = list_entry(entry, struct fuse_req, list);
		if (req->in.h.unique == unique)
		if (req->in.h.unique == unique \|\| req->intr_unique == unique)
		return req;
		}
		return NULL;
		@@ -750,7 +842,6 @@ static ssize_t fuse_dev_writev(struct file file, const struct iovec iov,
		goto err_unlock;

		req = request_find(fc, oh.unique);
		err = -EINVAL;
		if (!req)
		goto err_unlock;

		@@ -761,6 +852,23 @@ static ssize_t fuse_dev_writev(struct file file, const struct iovec iov,
		request_end(fc, req);
		return -ENOENT;
		}
		/* Is it an interrupt reply? */
		if (req->intr_unique == oh.unique) {
		err = -EINVAL;
		if (nbytes != sizeof(struct fuse_out_header))
		goto err_unlock;

		if (oh.error == -ENOSYS)
		fc->no_interrupt = 1;
		else if (oh.error == -EAGAIN)
		queue_interrupt(fc, req);

		spin_unlock(&fc->lock);
		fuse_copy_finish(&cs);
		return nbytes;
		}

		req->state = FUSE_REQ_WRITING;
		list_move(&req->list, &fc->io);
		req->out.h = oh;
		req->locked = 1;
		@@ -809,7 +917,7 @@ static unsigned fuse_dev_poll(struct file file, poll_table wait)
		spin_lock(&fc->lock);
		if (!fc->connected)
		mask = POLLERR;
		else if (!list_empty(&fc->pending))
		else if (request_pending(fc))
		mask \|= POLLIN \| POLLRDNORM;
		spin_unlock(&fc->lock);

fs/fuse/file.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -705,6 +705,9 @@ static int fuse_setlk(struct file file, struct file_lock fl)
		fuse_lk_fill(req, file, fl, opcode, pid);
		request_send(fc, req);
		err = req->out.h.error;
		/* locking is restartable */
		if (err == -EINTR)
		err = -ERESTARTSYS;
		fuse_put_request(fc, req);
		return err;
		}

fs/fuse/fuse_i.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -131,6 +131,7 @@ enum fuse_req_state {
		FUSE_REQ_PENDING,
		FUSE_REQ_READING,
		FUSE_REQ_SENT,
		FUSE_REQ_WRITING,
		FUSE_REQ_FINISHED
		};

		@@ -144,9 +145,15 @@ struct fuse_req {
		fuse_conn */
		struct list_head list;

		/** Entry on the interrupts list */
		struct list_head intr_entry;

		/** refcount */
		atomic_t count;

		/** Unique ID for the interrupt request */
		u64 intr_unique;

		/*
		* The following bitfields are either set once before the
		* request is queued or setting/clearing them is protected by
		@@ -165,6 +172,9 @@ struct fuse_req {
		/** Request is sent in the background */
		unsigned background:1;

		/** The request has been interrupted */
		unsigned interrupted:1;

		/** Data is being copied to/from the request */
		unsigned locked:1;

		@@ -262,6 +272,9 @@ struct fuse_conn {
		/** Number of requests currently in the background */
		unsigned num_background;

		/** Pending interrupts */
		struct list_head interrupts;

		/** Flag indicating if connection is blocked. This will be
		the case before the INIT reply is received, and if there
		are too many outstading backgrounds requests */
		@@ -320,6 +333,9 @@ struct fuse_conn {
		/** Is create not implemented by fs? */
		unsigned no_create : 1;

		/** Is interrupt not implemented by fs? */
		unsigned no_interrupt : 1;

		/** The number of requests waiting for completion */
		atomic_t num_waiting;

fs/fuse/inode.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -381,6 +381,7 @@ static struct fuse_conn *new_conn(void)
		INIT_LIST_HEAD(&fc->pending);
		INIT_LIST_HEAD(&fc->processing);
		INIT_LIST_HEAD(&fc->io);
		INIT_LIST_HEAD(&fc->interrupts);
		atomic_set(&fc->num_waiting, 0);
		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
		fc->bdi.unplug_io_fn = default_unplug_io_fn;

Admin message