Release 4.18 drivers/block/nbd.c

Directory: drivers/block
/*
 * Network block device - make block devices work over TCP
 *
 * Note that you can not swap over this thing, yet. Seems to work but
 * deadlocks sometimes - you can not swap over TCP in general.
 * 
 * Copyright 1997-2000, 2008 Pavel Machek <pavel@ucw.cz>
 * Parts copyright 2001 Steven Whitehouse <steve@chygwyn.com>
 *
 * This file is released under GPLv2 or later.
 *
 * (part of code stolen from loop.c)
 */

#include <linux/major.h>

#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/fs.h>
#include <linux/bio.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/ioctl.h>
#include <linux/mutex.h>
#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <linux/net.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/blk-mq.h>

#include <linux/uaccess.h>
#include <asm/types.h>

#include <linux/nbd.h>
#include <linux/nbd-netlink.h>
#include <net/genetlink.h>

static DEFINE_IDR(nbd_index_idr);
static DEFINE_MUTEX(nbd_index_mutex);

static int nbd_total_devices = 0;


struct nbd_sock {
	
struct socket *sock;
	
struct mutex tx_lock;
	
struct request *pending;
	
int sent;
	
bool dead;
	
int fallback_index;
	
int cookie;
};


struct recv_thread_args {
	
struct work_struct work;
	
struct nbd_device *nbd;
	
int index;
};


struct link_dead_args {
	
struct work_struct work;
	
int index;
};


#define NBD_TIMEDOUT			0

#define NBD_DISCONNECT_REQUESTED	1

#define NBD_DISCONNECTED		2

#define NBD_HAS_PID_FILE		3

#define NBD_HAS_CONFIG_REF		4

#define NBD_BOUND			5

#define NBD_DESTROY_ON_DISCONNECT	6

#define NBD_DISCONNECT_ON_CLOSE 	7


struct nbd_config {
	
u32 flags;
	
unsigned long runtime_flags;
	
u64 dead_conn_timeout;

	
struct nbd_sock **socks;
	
int num_connections;
	
atomic_t live_connections;
	
wait_queue_head_t conn_wait;

	
atomic_t recv_threads;
	
wait_queue_head_t recv_wq;
	
loff_t blksize;
	
loff_t bytesize;
#if IS_ENABLED(CONFIG_DEBUG_FS)
	
struct dentry *dbg_dir;
#endif
};


struct nbd_device {
	
struct blk_mq_tag_set tag_set;

	
int index;
	
refcount_t config_refs;
	
refcount_t refs;
	
struct nbd_config *config;
	
struct mutex config_lock;
	
struct gendisk *disk;

	
struct list_head list;
	
struct task_struct *task_recv;
	
struct task_struct *task_setup;
};


#define NBD_CMD_REQUEUED	1


struct nbd_cmd {
	
struct nbd_device *nbd;
	
struct mutex lock;
	
int index;
	
int cookie;
	
blk_status_t status;
	
unsigned long flags;
	
u32 cmd_cookie;
};

#if IS_ENABLED(CONFIG_DEBUG_FS)

static struct dentry *nbd_dbg_dir;
#endif


#define nbd_name(nbd) ((nbd)->disk->disk_name)


#define NBD_MAGIC 0x68797548


static unsigned int nbds_max = 16;

static int max_part = 16;

static struct workqueue_struct *recv_workqueue;

static int part_shift;

static int nbd_dev_dbg_init(struct nbd_device *nbd);
static void nbd_dev_dbg_close(struct nbd_device *nbd);
static void nbd_config_put(struct nbd_device *nbd);
static void nbd_connect_reply(struct genl_info *info, int index);
static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info);
static void nbd_dead_link_work(struct work_struct *work);
static void nbd_disconnect_and_put(struct nbd_device *nbd);



static inline struct device *nbd_to_dev(struct nbd_device *nbd)
{
	return disk_to_dev(nbd->disk);
}

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Markus Pargmann 14 63.64% 1 50.00%
Andrew Morton 8 36.36% 1 50.00%
Total 22 100.00% 2 100.00%



static void nbd_requeue_cmd(struct nbd_cmd *cmd)
{
	struct request *req = blk_mq_rq_from_pdu(cmd);

	if (!test_and_set_bit(NBD_CMD_REQUEUED, &cmd->flags))
		blk_mq_requeue_request(req, true);
}

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Total 41 100.00% 1 100.00%


#define NBD_COOKIE_BITS 32



static u64 nbd_cmd_handle(struct nbd_cmd *cmd)
{
	struct request *req = blk_mq_rq_from_pdu(cmd);
	u32 tag = blk_mq_unique_tag(req);
	u64 cookie = cmd->cmd_cookie;

	return (cookie << NBD_COOKIE_BITS) | tag;
}

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Josef Whiter 45 100.00% 1 100.00%
Total 45 100.00% 1 100.00%



static u32 nbd_handle_to_tag(u64 handle)
{
	return (u32)handle;
}

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Josef Whiter 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%



static u32 nbd_handle_to_cookie(u64 handle)
{
	return (u32)(handle >> NBD_COOKIE_BITS);
}

Contributors
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Josef Whiter 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static const char *nbdcmd_to_ascii(int cmd)
{
	switch (cmd) {
	case  NBD_CMD_READ: return "read";
	case NBD_CMD_WRITE: return "write";
	case  NBD_CMD_DISC: return "disconnect";
	case NBD_CMD_FLUSH: return "flush";
	case  NBD_CMD_TRIM: return "trim/discard";
	}
	return "invalid";
}

Contributors
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Andrew Morton 38 76.00% 1 33.33%
Paul Clements 6 12.00% 1 33.33%
Alex Bligh 6 12.00% 1 33.33%
Total 50 100.00% 3 100.00%



static ssize_t pid_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct gendisk *disk = dev_to_disk(dev);
	struct nbd_device *nbd = (struct nbd_device *)disk->private_data;

	return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv));
}

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Josef Whiter 59 100.00% 1 100.00%
Total 59 100.00% 1 100.00%


static const struct device_attribute pid_attr = {
	.attr = { .name = "pid", .mode = 0444},
	.show = pid_show,
};



static void nbd_dev_remove(struct nbd_device *nbd)
{
	struct gendisk *disk = nbd->disk;
	struct request_queue *q;

	if (disk) {
		q = disk->queue;
		del_gendisk(disk);
		blk_cleanup_queue(q);
		blk_mq_free_tag_set(&nbd->tag_set);
		disk->private_data = NULL;
		put_disk(disk);
	}
	kfree(nbd);
}

Contributors
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Josef Whiter 59 83.10% 2 66.67%
Josef Bacik 12 16.90% 1 33.33%
Total 71 100.00% 3 100.00%



static void nbd_put(struct nbd_device *nbd)
{
	if (refcount_dec_and_mutex_lock(&nbd->refs,
					&nbd_index_mutex)) {
		idr_remove(&nbd_index_idr, nbd->index);
		mutex_unlock(&nbd_index_mutex);
		nbd_dev_remove(nbd);
	}
}

Contributors
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Josef Whiter 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%



static int nbd_disconnected(struct nbd_config *config)
{
	return test_bit(NBD_DISCONNECTED, &config->runtime_flags) ||
		test_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags);
}

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Josef Whiter 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%



static void nbd_mark_nsock_dead(struct nbd_device *nbd, struct nbd_sock *nsock,
				int notify)
{
	if (!nsock->dead && notify && !nbd_disconnected(nbd->config)) {
		struct link_dead_args *args;
		args = kmalloc(sizeof(struct link_dead_args), GFP_NOIO);
		if (args) {
			INIT_WORK(&args->work, nbd_dead_link_work);
			args->index = nbd->index;
			queue_work(system_wq, &args->work);
		}
	}
	if (!nsock->dead) {
		kernel_sock_shutdown(nsock->sock, SHUT_RDWR);
		if (atomic_dec_return(&nbd->config->live_connections) == 0) {
			if (test_and_clear_bit(NBD_DISCONNECT_REQUESTED,
					       &nbd->config->runtime_flags)) {
				set_bit(NBD_DISCONNECTED,
					&nbd->config->runtime_flags);
				dev_info(nbd_to_dev(nbd),
					"Disconnected due to user request.\n");
			}
		}
	}
	nsock->dead = true;
	nsock->pending = NULL;
	nsock->sent = 0;
}

Contributors
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Josef Whiter 135 75.00% 3 75.00%
Kevin Vigor 45 25.00% 1 25.00%
Total 180 100.00% 4 100.00%



static void nbd_size_clear(struct nbd_device *nbd)
{
	if (nbd->config->bytesize) {
		set_capacity(nbd->disk, 0);
		kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
	}
}

Contributors
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Markus Pargmann 32 74.42% 1 25.00%
Josef Whiter 9 20.93% 2 50.00%
Ratna Manoj Bolla 2 4.65% 1 25.00%
Total 43 100.00% 4 100.00%



static void nbd_size_update(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;
	struct block_device *bdev = bdget_disk(nbd->disk, 0);

	if (config->flags & NBD_FLAG_SEND_TRIM) {
		nbd->disk->queue->limits.discard_granularity = config->blksize;
		nbd->disk->queue->limits.discard_alignment = config->blksize;
		blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX);
	}
	blk_queue_logical_block_size(nbd->disk->queue, config->blksize);
	blk_queue_physical_block_size(nbd->disk->queue, config->blksize);
	set_capacity(nbd->disk, config->bytesize >> 9);
	if (bdev) {
		if (bdev->bd_disk)
			bd_set_size(bdev, config->bytesize);
		else
			bdev->bd_invalidated = 1;
		bdput(bdev);
	}
	kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
}

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Josef Bacik 101 60.12% 3 50.00%
Markus Pargmann 41 24.40% 1 16.67%
Josef Whiter 26 15.48% 2 33.33%
Total 168 100.00% 6 100.00%



static void nbd_size_set(struct nbd_device *nbd, loff_t blocksize,
			 loff_t nr_blocks)
{
	struct nbd_config *config = nbd->config;
	config->blksize = blocksize;
	config->bytesize = blocksize * nr_blocks;
	if (nbd->task_recv != NULL)
		nbd_size_update(nbd);
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 27 50.94% 1 20.00%
Josef Bacik 16 30.19% 3 60.00%
Josef Whiter 10 18.87% 1 20.00%
Total 53 100.00% 5 100.00%



static void nbd_complete_rq(struct request *req)
{
	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);

	dev_dbg(nbd_to_dev(cmd->nbd), "request %p: %s\n", req,
		cmd->status ? "failed" : "done");

	blk_mq_end_request(req, cmd->status);
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 27 51.92% 2 28.57%
Andrew Morton 8 15.38% 1 14.29%
Markus Pargmann 7 13.46% 1 14.29%
Josef Bacik 7 13.46% 1 14.29%
Kiyoshi Ueda 2 3.85% 1 14.29%
Kevin Vigor 1 1.92% 1 14.29%
Total 52 100.00% 7 100.00%

/*
 * Forcibly shutdown the socket causing all listeners to error
 */


static void sock_shutdown(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;
	int i;

	if (config->num_connections == 0)
		return;
	if (test_and_set_bit(NBD_DISCONNECTED, &config->runtime_flags))
		return;

	for (i = 0; i < config->num_connections; i++) {
		struct nbd_sock *nsock = config->socks[i];
		mutex_lock(&nsock->tx_lock);
		nbd_mark_nsock_dead(nbd, nsock, 0);
		mutex_unlock(&nsock->tx_lock);
	}
	dev_warn(disk_to_dev(nbd->disk), "shutting down sockets\n");
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 63 56.76% 2 25.00%
Josef Whiter 22 19.82% 2 25.00%
Paul Clements 15 13.51% 1 12.50%
Markus Pargmann 10 9.01% 2 25.00%
Wanlong Gao 1 0.90% 1 12.50%
Total 111 100.00% 8 100.00%



static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req,
						 bool reserved)
{
	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);
	struct nbd_device *nbd = cmd->nbd;
	struct nbd_config *config;

	if (!refcount_inc_not_zero(&nbd->config_refs)) {
		cmd->status = BLK_STS_TIMEOUT;
		goto done;
	}
	config = nbd->config;

	if (!mutex_trylock(&cmd->lock))
		return BLK_EH_RESET_TIMER;

	if (config->num_connections > 1) {
		dev_err_ratelimited(nbd_to_dev(nbd),
				    "Connection timed out, retrying (%d/%d alive)\n",
				    atomic_read(&config->live_connections),
				    config->num_connections);
		/*
                 * Hooray we have more connections, requeue this IO, the submit
                 * path will put it on a real connection.
                 */
		if (config->socks && config->num_connections > 1) {
			if (cmd->index < config->num_connections) {
				struct nbd_sock *nsock =
					config->socks[cmd->index];
				mutex_lock(&nsock->tx_lock);
				/* We can have multiple outstanding requests, so
                                 * we don't want to mark the nsock dead if we've
                                 * already reconnected with a new socket, so
                                 * only mark it dead if its the same socket we
                                 * were sent out on.
                                 */
				if (cmd->cookie == nsock->cookie)
					nbd_mark_nsock_dead(nbd, nsock, 1);
				mutex_unlock(&nsock->tx_lock);
			}
			mutex_unlock(&cmd->lock);
			nbd_requeue_cmd(cmd);
			nbd_config_put(nbd);
			return BLK_EH_DONE;
		}
	} else {
		dev_err_ratelimited(nbd_to_dev(nbd),
				    "Connection timed out\n");
	}
	set_bit(NBD_TIMEDOUT, &config->runtime_flags);
	cmd->status = BLK_STS_IOERR;
	mutex_unlock(&cmd->lock);
	sock_shutdown(nbd);
	nbd_config_put(nbd);
done:
	blk_mq_complete_request(req);
	return BLK_EH_DONE;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 172 64.18% 5 27.78%
Josef Bacik 43 16.04% 5 27.78%
Christoph Hellwig 18 6.72% 4 22.22%
Kevin Vigor 13 4.85% 1 5.56%
Paul Clements 12 4.48% 1 5.56%
Markus Pargmann 10 3.73% 2 11.11%
Total 268 100.00% 18 100.00%

/*
 *  Send or receive packet.
 */


static int sock_xmit(struct nbd_device *nbd, int index, int send,
		     struct iov_iter *iter, int msg_flags, int *sent)
{
	struct nbd_config *config = nbd->config;
	struct socket *sock = config->socks[index]->sock;
	int result;
	struct msghdr msg;
	unsigned int noreclaim_flag;

	if (unlikely(!sock)) {
		dev_err_ratelimited(disk_to_dev(nbd->disk),
			"Attempted %s on closed socket in sock_xmit\n",
			(send ? "send" : "recv"));
		return -EINVAL;
	}

	msg.msg_iter = *iter;

	noreclaim_flag = memalloc_noreclaim_save();
	do {
		sock->sk->sk_allocation = GFP_NOIO | __GFP_MEMALLOC;
		msg.msg_name = NULL;
		msg.msg_namelen = 0;
		msg.msg_control = NULL;
		msg.msg_controllen = 0;
		msg.msg_flags = msg_flags | MSG_NOSIGNAL;

		if (send)
			result = sock_sendmsg(sock, &msg);
		else
			result = sock_recvmsg(sock, &msg, msg.msg_flags);

		if (result <= 0) {
			if (result == 0)
				result = -EPIPE; /* short read */
			break;
		}
		if (sent)
			*sent += result;
	} while (msg_data_left(&msg));

	memalloc_noreclaim_restore(noreclaim_flag);

	return result;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 95 41.30% 3 14.29%
Mike Snitzer 27 11.74% 1 4.76%
Josef Bacik 22 9.57% 3 14.29%
Al Viro 17 7.39% 2 9.52%
Andrew Morton 16 6.96% 2 9.52%
Josef Whiter 10 4.35% 1 4.76%
Paul Clements 9 3.91% 1 4.76%
Mel Gorman 8 3.48% 1 4.76%
Vlastimil Babka 8 3.48% 1 4.76%
Linus Torvalds 7 3.04% 2 9.52%
Américo Wang 5 2.17% 1 4.76%
Namhyung Kim 3 1.30% 1 4.76%
Wanlong Gao 2 0.87% 1 4.76%
David S. Miller 1 0.43% 1 4.76%
Total 230 100.00% 21 100.00%

/*
 * Different settings for sk->sk_sndtimeo can result in different return values
 * if there is a signal pending when we enter sendmsg, because reasons?
 */


static inline int was_interrupted(int result)
{
	return result == -ERESTARTSYS || result == -EINTR;
}

Contributors
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Josef Bacik 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%

/* always call with the tx_lock held */


static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
{
	struct request *req = blk_mq_rq_from_pdu(cmd);
	struct nbd_config *config = nbd->config;
	struct nbd_sock *nsock = config->socks[index];
	int result;
	struct nbd_request request = {.magic = htonl(NBD_REQUEST_MAGIC)};
	struct kvec iov = {.iov_base = &request, .iov_len = sizeof(request)};
	struct iov_iter from;
	unsigned long size = blk_rq_bytes(req);
	struct bio *bio;
	u64 handle;
	u32 type;
	u32 nbd_cmd_flags = 0;
	int sent = nsock->sent, skip = 0;

	iov_iter_kvec(&from, WRITE | ITER_KVEC, &iov, 1, sizeof(request));

	switch (req_op(req)) {
	case REQ_OP_DISCARD:
		type = NBD_CMD_TRIM;
		break;
	case REQ_OP_FLUSH:
		type = NBD_CMD_FLUSH;
		break;
	case REQ_OP_WRITE:
		type = NBD_CMD_WRITE;
		break;
	case REQ_OP_READ:
		type = NBD_CMD_READ;
		break;
	default:
		return -EIO;
	}

	if (rq_data_dir(req) == WRITE &&
	    (config->flags & NBD_FLAG_READ_ONLY)) {
		dev_err_ratelimited(disk_to_dev(nbd->disk),
				    "Write on read-only\n");
		return -EIO;
	}

	if (req->cmd_flags & REQ_FUA)
		nbd_cmd_flags |= NBD_CMD_FLAG_FUA;

	/* We did a partial send previously, and we at least sent the whole
         * request struct, so just go and send the rest of the pages in the
         * request.
         */
	if (sent) {
		if (sent >= sizeof(request)) {
			skip = sent - sizeof(request);
			goto send_pages;
		}
		iov_iter_advance(&from, sent);
	} else {
		cmd->cmd_cookie++;
	}
	cmd->index = index;
	cmd->cookie = nsock->cookie;
	request.type = htonl(type | nbd_cmd_flags);
	if (type != NBD_CMD_FLUSH) {
		request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
		request.len = htonl(size);
	}
	handle = nbd_cmd_handle(cmd);
	memcpy(request.handle, &handle, sizeof(handle));

	dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n",
		req, nbdcmd_to_ascii(type),
		(unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req));
	result = sock_xmit(nbd, index, 1, &from,
			(type == NBD_CMD_WRITE) ? MSG_MORE : 0, &sent);
	if (result <= 0) {
		if (was_interrupted(result)) {
			/* If we havne't sent anything we can just return BUSY,
                         * however if we have sent something we need to make
                         * sure we only allow this req to be sent until we are
                         * completely done.
                         */
			if (sent) {
				nsock->pending = req;
				nsock->sent = sent;
			}
			set_bit(NBD_CMD_REQUEUED, &cmd->flags);
			return BLK_STS_RESOURCE;
		}
		dev_err_ratelimited(disk_to_dev(nbd->disk),
			"Send control failed (result %d)\n", result);
		return -EAGAIN;
	}
send_pages:
	if (type != NBD_CMD_WRITE)
		goto out;

	bio = req->bio;
	while (bio) {
		struct bio *next = bio->bi_next;
		struct bvec_iter iter;
		struct bio_vec bvec;

		bio_for_each_segment(bvec, bio, iter) {
			bool is_last = !next && bio_iter_last(bvec, iter);
			int flags = is_last ? 0 : MSG_MORE;

			dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n",
				req, bvec.bv_len);
			iov_iter_bvec(&from, ITER_BVEC | WRITE,
				      &bvec, 1, bvec.bv_len);
			if (skip) {
				if (skip >= iov_iter_count(&from)) {
					skip -= iov_iter_count(&from);
					continue;
				}
				iov_iter_advance(&from, skip);
				skip = 0;
			}
			result = sock_xmit(nbd, index, 1, &from, flags, &sent);
			if (result <= 0) {
				if (was_interrupted(result)) {
					/* We've already sent the header, we
                                         * have no choice but to set pending and
                                         * return BUSY.
                                         */
					nsock->pending = req;
					nsock->sent = sent;
					set_bit(NBD_CMD_REQUEUED, &cmd->flags);
					return BLK_STS_RESOURCE;
				}
				dev_err(disk_to_dev(nbd->disk),
					"Send data failed (result %d)\n",
					result);
				return -EAGAIN;
			}
			/*
                         * The completion might already have come in,
                         * so break for the last one instead of letting
                         * the iterator do it. This prevents use-after-free
                         * of the bio.
                         */
			if (is_last)
				break;
		}
		bio = next;
	}
out:
	nsock->pending = NULL;
	nsock->sent = 0;
	return 0;
}

Contributors
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Josef Bacik 207 27.67% 6 14.29%
Linus Torvalds (pre-git) 97 12.97% 3 7.14%
Christoph Hellwig 86 11.50% 4 9.52%
Al Viro 78 10.43% 1 2.38%
Josef Whiter 67 8.96% 5 11.90%
Jens Axboe 45 6.02% 1 2.38%
Andrew Morton 40 5.35% 3 7.14%
Linus Torvalds 30 4.01% 2 4.76%
Markus Pargmann 18 2.41% 2 4.76%
Shaun McDowell 18 2.41% 1 2.38%
Tejun Heo 12 1.60% 2 4.76%
Américo Wang 11 1.47% 1 2.38%
Wanlong Gao 7 0.94% 1 2.38%
Neil Brown 7 0.94% 1 2.38%
Alex Bligh 6 0.80% 1 2.38%
Paul Clements 5 0.67% 1 2.38%
Michael Christie 4 0.53% 2 4.76%
Dave Jones 4 0.53% 1 2.38%
Kent Overstreet 3 0.40% 2 4.76%
Kevin Vigor 2 0.27% 1 2.38%
Hani Benhabiles 1 0.13% 1 2.38%
Total 748 100.00% 42 100.00%

/* NULL returned = something went wrong, inform userspace */


static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index)
{
	struct nbd_config *config = nbd->config;
	int result;
	struct nbd_reply reply;
	struct nbd_cmd *cmd;
	struct request *req = NULL;
	u64 handle;
	u16 hwq;
	u32 tag;
	struct kvec iov = {.iov_base = &reply, .iov_len = sizeof(reply)};
	struct iov_iter to;
	int ret = 0;

	reply.magic = 0;
	iov_iter_kvec(&to, READ | ITER_KVEC, &iov, 1, sizeof(reply));
	result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
	if (result <= 0) {
		if (!nbd_disconnected(config))
			dev_err(disk_to_dev(nbd->disk),
				"Receive control failed (result %d)\n", result);
		return ERR_PTR(result);
	}

	if (ntohl(reply.magic) != NBD_REPLY_MAGIC) {
		dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n",
				(unsigned long)ntohl(reply.magic));
		return ERR_PTR(-EPROTO);
	}

	memcpy(&handle, reply.handle, sizeof(handle));
	tag = nbd_handle_to_tag(handle);
	hwq = blk_mq_unique_tag_to_hwq(tag);
	if (hwq < nbd->tag_set.nr_hw_queues)
		req = blk_mq_tag_to_rq(nbd->tag_set.tags[hwq],
				       blk_mq_unique_tag_to_tag(tag));
	if (!req || !blk_mq_request_started(req)) {
		dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%d) %p\n",
			tag, req);
		return ERR_PTR(-ENOENT);
	}
	cmd = blk_mq_rq_to_pdu(req);

	mutex_lock(&cmd->lock);
	if (cmd->cmd_cookie != nbd_handle_to_cookie(handle)) {
		dev_err(disk_to_dev(nbd->disk), "Double reply on req %p, cmd_cookie %u, handle cookie %u\n",
			req, cmd->cmd_cookie, nbd_handle_to_cookie(handle));
		ret = -ENOENT;
		goto out;
	}
	if (test_bit(NBD_CMD_REQUEUED, &cmd->flags)) {
		dev_err(disk_to_dev(nbd->disk), "Raced with timeout on req %p\n",
			req);
		ret = -ENOENT;
		goto out;
	}
	if (ntohl(reply.error)) {
		dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n",
			ntohl(reply.error));
		cmd->status = BLK_STS_IOERR;
		goto out;
	}

	dev_dbg(nbd_to_dev(nbd), "request %p: got reply\n", req);
	if (rq_data_dir(req) != WRITE) {
		struct req_iterator iter;
		struct bio_vec bvec;

		rq_for_each_segment(bvec, req, iter) {
			iov_iter_bvec(&to, ITER_BVEC | READ,
				      &bvec, 1, bvec.bv_len);
			result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
			if (result <= 0) {
				dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n",
					result);
				/*
                                 * If we've disconnected or we only have 1
                                 * connection then we need to make sure we
                                 * complete this request, otherwise error out
                                 * and let the timeout stuff handle resubmitting
                                 * this request onto another connection.
                                 */
				if (nbd_disconnected(config) ||
				    config->num_connections <= 1) {
					cmd->status = BLK_STS_IOERR;
					goto out;
				}
				ret = -EIO;
				goto out;
			}
			dev_dbg(nbd_to_dev(nbd), "request %p: got %d bytes data\n",
				req, bvec.bv_len);
		}
	}
out:
	mutex_unlock(&cmd->lock);
	return ret ? ERR_PTR(ret) : cmd;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 157 26.08% 3 9.09%
Josef Bacik 106 17.61% 4 12.12%
Linus Torvalds (pre-git) 87 14.45% 2 6.06%
Al Viro 70 11.63% 1 3.03%
Andrew Morton 40 6.64% 3 9.09%
Michal Feix 33 5.48% 2 6.06%
Markus Pargmann 30 4.98% 2 6.06%
Américo Wang 23 3.82% 1 3.03%
Christoph Hellwig 9 1.50% 3 9.09%
Wanlong Gao 9 1.50% 1 3.03%
Lou Langholtz 9 1.50% 1 3.03%
Linus Torvalds 8 1.33% 4 12.12%
Herbert Xu 8 1.33% 1 3.03%
Neil Brown 5 0.83% 1 3.03%
Dave Jones 3 0.50% 1 3.03%
Kevin Vigor 2 0.33% 1 3.03%
Kent Overstreet 2 0.33% 1 3.03%
Adrian Bunk 1 0.17% 1 3.03%
Total 602 100.00% 33 100.00%



static void recv_work(struct work_struct *work)
{
	struct recv_thread_args *args = container_of(work,
						     struct recv_thread_args,
						     work);
	struct nbd_device *nbd = args->nbd;
	struct nbd_config *config = nbd->config;
	struct nbd_cmd *cmd;

	while (1) {
		cmd = nbd_read_stat(nbd, args->index);
		if (IS_ERR(cmd)) {
			struct nbd_sock *nsock = config->socks[args->index];

			mutex_lock(&nsock->tx_lock);
			nbd_mark_nsock_dead(nbd, nsock, 1);
			mutex_unlock(&nsock->tx_lock);
			break;
		}

		blk_mq_complete_request(blk_mq_rq_from_pdu(cmd));
	}
	atomic_dec(&config->recv_threads);
	wake_up(&config->recv_wq);
	nbd_config_put(nbd);
	kfree(args);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 58 38.93% 3 23.08%
Josef Bacik 50 33.56% 2 15.38%
Markus Pargmann 20 13.42% 3 23.08%
Linus Torvalds (pre-git) 11 7.38% 2 15.38%
Andrew Morton 5 3.36% 1 7.69%
Christoph Hellwig 4 2.68% 1 7.69%
Wanlong Gao 1 0.67% 1 7.69%
Total 149 100.00% 13 100.00%



static void nbd_clear_req(struct request *req, void *data, bool reserved)
{
	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);

	cmd->status = BLK_STS_IOERR;
	blk_mq_complete_request(req);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 16 41.03% 3 30.00%
Josef Bacik 14 35.90% 2 20.00%
Christoph Hellwig 7 17.95% 3 30.00%
Dave Jones 1 2.56% 1 10.00%
Adrian Bunk 1 2.56% 1 10.00%
Total 39 100.00% 10 100.00%



static void nbd_clear_que(struct nbd_device *nbd)
{
	blk_mq_quiesce_queue(nbd->disk->queue);
	blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL);
	blk_mq_unquiesce_queue(nbd->disk->queue);
	dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n");
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 16 30.19% 1 14.29%
Josef Bacik 15 28.30% 1 14.29%
Markus Pargmann 14 26.42% 2 28.57%
Paul Clements 5 9.43% 1 14.29%
Sagi Grimberg 2 3.77% 1 14.29%
Linus Torvalds (pre-git) 1 1.89% 1 14.29%
Total 53 100.00% 7 100.00%



static int find_fallback(struct nbd_device *nbd, int index)
{
	struct nbd_config *config = nbd->config;
	int new_index = -1;
	struct nbd_sock *nsock = config->socks[index];
	int fallback = nsock->fallback_index;

	if (test_bit(NBD_DISCONNECTED, &config->runtime_flags))
		return new_index;

	if (config->num_connections <= 1) {
		dev_err_ratelimited(disk_to_dev(nbd->disk),
				    "Attempted send on invalid socket\n");
		return new_index;
	}

	if (fallback >= 0 && fallback < config->num_connections &&
	    !config->socks[fallback]->dead)
		return fallback;

	if (nsock->fallback_index < 0 ||
	    nsock->fallback_index >= config->num_connections ||
	    config->socks[nsock->fallback_index]->dead) {
		int i;
		for (i = 0; i < config->num_connections; i++) {
			if (i == index)
				continue;
			if (!config->socks[i]->dead) {
				new_index = i;
				break;
			}
		}
		nsock->fallback_index = new_index;
		if (new_index < 0) {
			dev_err_ratelimited(disk_to_dev(nbd->disk),
					    "Dead connection, failed to find a fallback\n");
			return new_index;
		}
	}
	new_index = nsock->fallback_index;
	return new_index;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 226 100.00% 2 100.00%
Total 226 100.00% 2 100.00%



static int wait_for_reconnect(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;
	if (!config->dead_conn_timeout)
		return 0;
	if (test_bit(NBD_DISCONNECTED, &config->runtime_flags))
		return 0;
	return wait_event_timeout(config->conn_wait,
				  atomic_read(&config->live_connections) > 0,
				  config->dead_conn_timeout) > 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 63 91.30% 1 33.33%
Kevin Vigor 5 7.25% 1 33.33%
Josef Bacik 1 1.45% 1 33.33%
Total 69 100.00% 3 100.00%



static int nbd_handle_cmd(struct nbd_cmd *cmd, int index)
{
	struct request *req = blk_mq_rq_from_pdu(cmd);
	struct nbd_device *nbd = cmd->nbd;
	struct nbd_config *config;
	struct nbd_sock *nsock;
	int ret;

	if (!refcount_inc_not_zero(&nbd->config_refs)) {
		dev_err_ratelimited(disk_to_dev(nbd->disk),
				    "Socks array is empty\n");
		blk_mq_start_request(req);
		return -EINVAL;
	}
	config = nbd->config;

	if (index >= config->num_connections) {
		dev_err_ratelimited(disk_to_dev(nbd->disk),
				    "Attempted send on invalid socket\n");
		nbd_config_put(nbd);
		blk_mq_start_request(req);
		return -EINVAL;
	}
	cmd->status = BLK_STS_OK;
again:
	nsock = config->socks[index];
	mutex_lock(&nsock->tx_lock);
	if (nsock->dead) {
		int old_index = index;
		index = find_fallback(nbd, index);
		mutex_unlock(&nsock->tx_lock);
		if (index < 0) {
			if (wait_for_reconnect(nbd)) {
				index = old_index;
				goto again;
			}
			/* All the sockets should already be down at this point,
                         * we just want to make sure that DISCONNECTED is set so
                         * any requests that come in that were queue'ed waiting
                         * for the reconnect timer don't trigger the timer again
                         * and instead just error out.
                         */
			sock_shutdown(nbd);
			nbd_config_put(nbd);
			blk_mq_start_request(req);
			return -EIO;
		}
		goto again;
	}

	/* Handle the case that we have a pending request that was partially
         * transmitted that _has_ to be serviced first.  We need to call requeue
         * here so that it gets put _after_ the request that is already on the
         * dispatch list.
         */
	blk_mq_start_request(req);
	if (unlikely(nsock->pending && nsock->pending != req)) {
		nbd_requeue_cmd(cmd);
		ret = 0;
		goto out;
	}
	/*
         * Some failures are related to the link going down, so anything that
         * returns EAGAIN can be retried on a different socket.
         */
	ret = nbd_send_cmd(nbd, cmd, index);
	if (ret == -EAGAIN) {
		dev_err_ratelimited(disk_to_dev(nbd->disk),
				    "Request send failed, requeueing\n");
		nbd_mark_nsock_dead(nbd, nsock, 1);
		nbd_requeue_cmd(cmd);
		ret = 0;
	}
out:
	mutex_unlock(&nsock->tx_lock);
	nbd_config_put(nbd);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 156 47.56% 5 22.73%
Josef Bacik 134 40.85% 5 22.73%
Linus Torvalds (pre-git) 12 3.66% 3 13.64%
Paul Clements 9 2.74% 1 4.55%
Laurent Vivier 7 2.13% 1 4.55%
Christoph Hellwig 3 0.91% 2 9.09%
Al Viro 3 0.91% 1 4.55%
Herbert Xu 1 0.30% 1 4.55%
Jens Axboe 1 0.30% 1 4.55%
Américo Wang 1 0.30% 1 4.55%
Ingo Molnar 1 0.30% 1 4.55%
Total 328 100.00% 22 100.00%



static blk_status_t nbd_queue_rq(struct blk_mq_hw_ctx *hctx,
			const struct blk_mq_queue_data *bd)
{
	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
	int ret;

	/*
         * Since we look at the bio's to send the request over the network we
         * need to make sure the completion work doesn't mark this request done
         * before we are done doing our send.  This keeps us from dereferencing
         * freed data if we have particularly fast completions (ie we get the
         * completion before we exit sock_xmit on the last bvec) or in the case
         * that the server is misbehaving (or there was an error) before we're
         * done sending everything over the wire.
         */
	mutex_lock(&cmd->lock);
	clear_bit(NBD_CMD_REQUEUED, &cmd->flags);

	/* We can be called directly from the user space process, which means we
         * could possibly have signals pending so our sendmsg will fail.  In
         * this case we need to return that we are busy, otherwise error out as
         * appropriate.
         */
	ret = nbd_handle_cmd(cmd, hctx->queue_num);
	if (ret < 0)
		ret = BLK_STS_IOERR;
	else if (!ret)
		ret = BLK_STS_OK;
	mutex_unlock(&cmd->lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 72 76.60% 4 40.00%
Josef Whiter 14 14.89% 2 20.00%
Linus Torvalds (pre-git) 4 4.26% 2 20.00%
Laurent Vivier 3 3.19% 1 10.00%
Christoph Hellwig 1 1.06% 1 10.00%
Total 94 100.00% 10 100.00%



static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
			  bool netlink)
{
	struct nbd_config *config = nbd->config;
	struct socket *sock;
	struct nbd_sock **socks;
	struct nbd_sock *nsock;
	int err;

	sock = sockfd_lookup(arg, &err);
	if (!sock)
		return err;

	if (!netlink && !nbd->task_setup &&
	    !test_bit(NBD_BOUND, &config->runtime_flags))
		nbd->task_setup = current;

	if (!netlink &&
	    (nbd->task_setup != current ||
	     test_bit(NBD_BOUND, &config->runtime_flags))) {
		dev_err(disk_to_dev(nbd->disk),
			"Device being setup by another task");
		sockfd_put(sock);
		return -EBUSY;
	}

	socks = krealloc(config->socks, (config->num_connections + 1) *
			 sizeof(struct nbd_sock *), GFP_KERNEL);
	if (!socks) {
		sockfd_put(sock);
		return -ENOMEM;
	}
	nsock = kzalloc(sizeof(struct nbd_sock), GFP_KERNEL);
	if (!nsock) {
		sockfd_put(sock);
		return -ENOMEM;
	}

	config->socks = socks;

	nsock->fallback_index = -1;
	nsock->dead = false;
	mutex_init(&nsock->tx_lock);
	nsock->sock = sock;
	nsock->pending = NULL;
	nsock->sent = 0;
	nsock->cookie = 0;
	socks[config->num_connections++] = nsock;
	atomic_inc(&config->live_connections);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 154 55.00% 3 30.00%
Josef Whiter 92 32.86% 6 60.00%
Markus Pargmann 34 12.14% 1 10.00%
Total 280 100.00% 10 100.00%



static int nbd_reconnect_socket(struct nbd_device *nbd, unsigned long arg)
{
	struct nbd_config *config = nbd->config;
	struct socket *sock, *old;
	struct recv_thread_args *args;
	int i;
	int err;

	sock = sockfd_lookup(arg, &err);
	if (!sock)
		return err;

	args = kzalloc(sizeof(*args), GFP_KERNEL);
	if (!args) {
		sockfd_put(sock);
		return -ENOMEM;
	}

	for (i = 0; i < config->num_connections; i++) {
		struct nbd_sock *nsock = config->socks[i];

		if (!nsock->dead)
			continue;

		mutex_lock(&nsock->tx_lock);
		if (!nsock->dead) {
			mutex_unlock(&nsock->tx_lock);
			continue;
		}
		sk_set_memalloc(sock->sk);
		if (nbd->tag_set.timeout)
			sock->sk->sk_sndtimeo = nbd->tag_set.timeout;
		atomic_inc(&config->recv_threads);
		refcount_inc(&nbd->config_refs);
		old = nsock->sock;
		nsock->fallback_index = -1;
		nsock->sock = sock;
		nsock->dead = false;
		INIT_WORK(&args->work, recv_work);
		args->index = i;
		args->nbd = nbd;
		nsock->cookie++;
		mutex_unlock(&nsock->tx_lock);
		sockfd_put(old);

		clear_bit(NBD_DISCONNECTED, &config->runtime_flags);

		/* We take the tx_mutex in an error path in the recv_work, so we
                 * need to queue_work outside of the tx_mutex.
                 */
		queue_work(recv_workqueue, &args->work);

		atomic_inc(&config->live_connections);
		wake_up(&config->conn_wait);
		return 0;
	}
	sockfd_put(sock);
	kfree(args);
	return -ENOSPC;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 210 66.67% 5 33.33%
Markus Pargmann 49 15.56% 2 13.33%
Josef Bacik 46 14.60% 5 33.33%
Al Viro 6 1.90% 1 6.67%
Ratna Manoj Bolla 3 0.95% 1 6.67%
Paolo Bonzini 1 0.32% 1 6.67%
Total 315 100.00% 15 100.00%



static void nbd_bdev_reset(struct block_device *bdev)
{
	if (bdev->bd_openers > 1)
		return;
	bd_set_size(bdev, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 18 66.67% 2 50.00%
Josef Bacik 6 22.22% 1 25.00%
Andrew Morton 3 11.11% 1 25.00%
Total 27 100.00% 4 100.00%



static void nbd_parse_flags(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;
	if (config->flags & NBD_FLAG_READ_ONLY)
		set_disk_ro(nbd->disk, true);
	else
		set_disk_ro(nbd->disk, false);
	if (config->flags & NBD_FLAG_SEND_TRIM)
		blk_queue_flag_set(QUEUE_FLAG_DISCARD, nbd->disk->queue);
	if (config->flags & NBD_FLAG_SEND_FLUSH) {
		if (config->flags & NBD_FLAG_SEND_FUA)
			blk_queue_write_cache(nbd->disk->queue, true, true);
		else
			blk_queue_write_cache(nbd->disk->queue, true, false);
	}
	else
		blk_queue_write_cache(nbd->disk->queue, false, false);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 93 74.40% 2 33.33%
Shaun McDowell 24 19.20% 1 16.67%
Josef Bacik 7 5.60% 2 33.33%
Bart Van Assche 1 0.80% 1 16.67%
Total 125 100.00% 6 100.00%



static void send_disconnects(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;
	struct nbd_request request = {
		.magic = htonl(NBD_REQUEST_MAGIC),
		.type = htonl(NBD_CMD_DISC),
        };
	struct kvec iov = {.iov_base = &request, .iov_len = sizeof(request)};
	struct iov_iter from;
	int i, ret;

	for (i = 0; i < config->num_connections; i++) {
		struct nbd_sock *nsock = config->socks[i];

		iov_iter_kvec(&from, WRITE | ITER_KVEC, &iov, 1, sizeof(request));
		mutex_lock(&nsock->tx_lock);
		ret = sock_xmit(nbd, i, 1, &from, 0, NULL);
		if (ret <= 0)
			dev_err(disk_to_dev(nbd->disk),
				"Send disconnect failed %d\n", ret);
		mutex_unlock(&nsock->tx_lock);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 101 58.05% 2 25.00%
Josef Bacik 64 36.78% 3 37.50%
Markus Pargmann 4 2.30% 1 12.50%
Andrew Morton 3 1.72% 1 12.50%
Wanlong Gao 2 1.15% 1 12.50%
Total 174 100.00% 8 100.00%



static int nbd_disconnect(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;

	dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n");
	set_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags);
	send_disconnects(nbd);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 44 88.00% 2 28.57%
Josef Bacik 3 6.00% 2 28.57%
Paul Clements 1 2.00% 1 14.29%
Wanlong Gao 1 2.00% 1 14.29%
Pavel Machek 1 2.00% 1 14.29%
Total 50 100.00% 7 100.00%



static void nbd_clear_sock(struct nbd_device *nbd)
{
	sock_shutdown(nbd);
	nbd_clear_que(nbd);
	nbd->task_setup = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 20 74.07% 2 50.00%
Josef Bacik 5 18.52% 1 25.00%
Alex Bligh 2 7.41% 1 25.00%
Total 27 100.00% 4 100.00%



static void nbd_config_put(struct nbd_device *nbd)
{
	if (refcount_dec_and_mutex_lock(&nbd->config_refs,
					&nbd->config_lock)) {
		struct nbd_config *config = nbd->config;
		nbd_dev_dbg_close(nbd);
		nbd_size_clear(nbd);
		if (test_and_clear_bit(NBD_HAS_PID_FILE,
				       &config->runtime_flags))
			device_remove_file(disk_to_dev(nbd->disk), &pid_attr);
		nbd->task_recv = NULL;
		nbd_clear_sock(nbd);
		if (config->num_connections) {
			int i;
			for (i = 0; i < config->num_connections; i++) {
				sockfd_put(config->socks[i]->sock);
				kfree(config->socks[i]);
			}
			kfree(config->socks);
		}
		kfree(nbd->config);
		nbd->config = NULL;

		nbd->tag_set.timeout = 0;
		nbd->disk->queue->limits.discard_granularity = 0;
		nbd->disk->queue->limits.discard_alignment = 0;
		blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX);
		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, nbd->disk->queue);

		mutex_unlock(&nbd->config_lock);
		nbd_put(nbd);
		module_put(THIS_MODULE);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 152 67.56% 6 33.33%
Josef Bacik 29 12.89% 3 16.67%
Ilya Dryomov 27 12.00% 2 11.11%
Paul Clements 5 2.22% 1 5.56%
Markus Pargmann 4 1.78% 2 11.11%
Pavel Machek 3 1.33% 1 5.56%
Linus Torvalds (pre-git) 2 0.89% 1 5.56%
Wanlong Gao 2 0.89% 1 5.56%
Bart Van Assche 1 0.44% 1 5.56%
Total 225 100.00% 18 100.00%



static int nbd_start_device(struct nbd_device *nbd)
{
	struct nbd_config *config = nbd->config;
	int num_connections = config->num_connections;
	int error = 0, i;

	if (nbd->task_recv)
		return -EBUSY;
	if (!config->socks)
		return -EINVAL;
	if (num_connections > 1 &&
	    !(config->flags & NBD_FLAG_CAN_MULTI_CONN)) {
		dev_err(disk_to_dev(nbd->disk), "server does not support multiple connections per device.\n");
		return -EINVAL;
	}

	blk_mq_update_nr_hw_queues(&nbd->tag_set, config->num_connections);
	nbd->task_recv = current;

	nbd_parse_flags(nbd);

	error = device_create_file(disk_to_dev(nbd->disk), &pid_attr);
	if (error) {
		dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n");
		return error;
	}
	set_bit(NBD_HAS_PID_FILE, &config->runtime_flags);

	nbd_dev_dbg_init(nbd);
	for (i = 0; i < num_connections; i++) {
		struct recv_thread_args *args;

		args = kzalloc(sizeof(*args), GFP_KERNEL);
		if (!args) {
			sock_shutdown(nbd);
			return -ENOMEM;
		}
		sk_set_memalloc(config->socks[i]->sock->sk);
		if (nbd->tag_set.timeout)
			config->socks[i]->sock->sk->sk_sndtimeo =
				nbd->tag_set.timeout;
		atomic_inc(&config->recv_threads);
		refcount_inc(&nbd->config_refs);
		INIT_WORK(&args->work, recv_work);
		args->nbd = nbd;
		args->index = i;
		queue_work(recv_workqueue, &args->work);
	}
	nbd_size_update(nbd);
	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 226 73.38% 3 33.33%
Josef Bacik 82 26.62% 6 66.67%
Total 308 100.00% 9 100.00%



static int nbd_start_device_ioctl(struct nbd_device *nbd, struct block_device *bdev)
{
	struct nbd_config *config = nbd->config;
	int ret;

	ret = nbd_start_device(nbd);
	if (ret)
		return ret;

	if (max_part)
		bdev->bd_invalidated = 1;
	mutex_unlock(&nbd->config_lock);
	ret = wait_event_interruptible(config->recv_wq,
					 atomic_read(&config->recv_threads) == 0);
	if (ret)
		sock_shutdown(nbd);
	mutex_lock(&nbd->config_lock);
	nbd_bdev_reset(bdev);
	/* user requested, ignore socket errors */
	if (test_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags))
		ret = 0;
	if (test_bit(NBD_TIMEDOUT, &config->runtime_flags))
		ret = -ETIMEDOUT;
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 130 94.20% 3 37.50%
Josef Bacik 5 3.62% 3 37.50%
Pavel Machek 2 1.45% 1 12.50%
Linus Torvalds (pre-git) 1 0.72% 1 12.50%
Total 138 100.00% 8 100.00%



static void nbd_clear_sock_ioctl(struct nbd_device *nbd,
				 struct block_device *bdev)
{
	sock_shutdown(nbd);
	kill_bdev(bdev);
	nbd_bdev_reset(bdev);
	if (test_and_clear_bit(NBD_HAS_CONFIG_REF,
			       &nbd->config->runtime_flags))
		nbd_config_put(nbd);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 37 74.00% 3 60.00%
Pavel Machek 12 24.00% 1 20.00%
Wanlong Gao 1 2.00% 1 20.00%
Total 50 100.00% 5 100.00%

/* Must be called with config_lock held */


static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
		       unsigned int cmd, unsigned long arg)
{
	struct nbd_config *config = nbd->config;

	switch (cmd) {
	case NBD_DISCONNECT:
		return nbd_disconnect(nbd);
	case NBD_CLEAR_SOCK:
		nbd_clear_sock_ioctl(nbd, bdev);
		return 0;
	case NBD_SET_SOCK:
		return nbd_add_socket(nbd, arg, false);
	case NBD_SET_BLKSIZE:
		nbd_size_set(nbd, arg,
			     div_s64(config->bytesize, arg));
		return 0;
	case NBD_SET_SIZE:
		nbd_size_set(nbd, config->blksize,
			     div_s64(arg, config->blksize));
		return 0;
	case NBD_SET_SIZE_BLOCKS:
		nbd_size_set(nbd, config->blksize, arg);
		return 0;
	case NBD_SET_TIMEOUT:
		if (arg) {
			nbd->tag_set.timeout = arg * HZ;
			blk_queue_rq_timeout(nbd->disk->queue, arg * HZ);
		}
		return 0;

	case NBD_SET_FLAGS:
		config->flags = arg;
		return 0;
	case NBD_DO_IT:
		return nbd_start_device_ioctl(nbd, bdev);
	case NBD_CLEAR_QUE:
		/*
                 * This is for compatibility only.  The queue is always cleared
                 * by NBD_DO_IT or NBD_CLEAR_SOCK.
                 */
		return 0;
	case NBD_PRINT_DEBUG:
		/*
                 * For compatibility only, we no longer keep a list of
                 * outstanding requests.
                 */
		return 0;
	}
	return -ENOTTY;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 195 91.55% 2 33.33%
Pavel Machek 13 6.10% 1 16.67%
Wanlong Gao 3 1.41% 1 16.67%
Arnd Bergmann 1 0.47% 1 16.67%
Linus Torvalds (pre-git) 1 0.47% 1 16.67%
Total 213 100.00% 6 100.00%



static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
		     unsigned int cmd, unsigned long arg)
{
	struct nbd_device *nbd = bdev->bd_disk->private_data;
	struct nbd_config *config = nbd->config;
	int error = -EINVAL;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	/* The block layer will pass back some non-nbd ioctls in case we have
         * special handling for them, but we don't so just return an error.
         */
	if (_IOC_TYPE(cmd) != 0xab)
		return -EINVAL;

	mutex_lock(&nbd->config_lock);

	/* Don't allow ioctl operations on a nbd device that was created with
         * netlink, unless it's DISCONNECT or CLEAR_SOCK, which are fine.
         */
	if (!test_bit(NBD_BOUND, &config->runtime_flags) ||
	    (cmd == NBD_DISCONNECT || cmd == NBD_CLEAR_SOCK))
		error = __nbd_ioctl(bdev, nbd, cmd, arg);
	else
		dev_err(nbd_to_dev(nbd), "Cannot use ioctl interface on a netlink controlled device.\n");
	mutex_unlock(&nbd->config_lock);
	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 110 78.01% 2 20.00%
Markus Pargmann 16 11.35% 1 10.00%
Linus Torvalds (pre-git) 8 5.67% 2 20.00%
Sven Wegener 3 2.13% 1 10.00%
Laurent Vivier 1 0.71% 1 10.00%
Linus Torvalds 1 0.71% 1 10.00%
Al Viro 1 0.71% 1 10.00%
Adrian Bunk 1 0.71% 1 10.00%
Total 141 100.00% 10 100.00%



static struct nbd_config *nbd_alloc_config(void)
{
	struct nbd_config *config;

	config = kzalloc(sizeof(struct nbd_config), GFP_NOFS);
	if (!config)
		return NULL;
	atomic_set(&config->recv_threads, 0);
	init_waitqueue_head(&config->recv_wq);
	init_waitqueue_head(&config->conn_wait);
	config->blksize = 1024;
	atomic_set(&config->live_connections, 0);
	try_module_get(THIS_MODULE);
	return config;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 75 87.21% 2 66.67%
Markus Pargmann 11 12.79% 1 33.33%
Total 86 100.00% 3 100.00%



static int nbd_open(struct block_device *bdev, fmode_t mode)
{
	struct nbd_device *nbd;
	int ret = 0;

	mutex_lock(&nbd_index_mutex);
	nbd = bdev->bd_disk->private_data;
	if (!nbd) {
		ret = -ENXIO;
		goto out;
	}
	if (!refcount_inc_not_zero(&nbd->refs)) {
		ret = -ENXIO;
		goto out;
	}
	if (!refcount_inc_not_zero(&nbd->config_refs)) {
		struct nbd_config *config;

		mutex_lock(&nbd->config_lock);
		if (refcount_inc_not_zero(&nbd->config_refs)) {
			mutex_unlock(&nbd->config_lock);
			goto out;
		}
		config = nbd->config = nbd_alloc_config();
		if (!config) {
			ret = -ENOMEM;
			mutex_unlock(&nbd->config_lock);
			goto out;
		}
		refcount_set(&nbd->config_refs, 1);
		refcount_inc(&nbd->refs);
		mutex_unlock(&nbd->config_lock);
		bdev->bd_invalidated = 1;
	} else if (nbd_disconnected(nbd->config)) {
		bdev->bd_invalidated = 1;
	}
out:
	mutex_unlock(&nbd_index_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 145 67.13% 2 28.57%
Markus Pargmann 36 16.67% 1 14.29%
Josef Bacik 24 11.11% 1 14.29%
Namhyung Kim 6 2.78% 2 28.57%
Laurent Vivier 5 2.31% 1 14.29%
Total 216 100.00% 7 100.00%



static void nbd_release(struct gendisk *disk, fmode_t mode)
{
	struct nbd_device *nbd = disk->private_data;
	struct block_device *bdev = bdget_disk(disk, 0);

	if (test_bit(NBD_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) &&
			bdev->bd_openers == 0)
		nbd_disconnect_and_put(nbd);

	nbd_config_put(nbd);
	nbd_put(nbd);
}

Contributors
Person Tokens Prop Commits CommitProp
Doron Roberts-Kedes 37 52.86% 1 25.00%
Josef Whiter 30 42.86% 2 50.00%
Markus Pargmann 3 4.29% 1 25.00%
Total 70 100.00% 4 100.00%


static const struct block_device_operations nbd_fops =
{
	.owner =	THIS_MODULE,
	.open =		nbd_open,
	.release =	nbd_release,
	.ioctl =	nbd_ioctl,
	.compat_ioctl =	nbd_ioctl,
};

#if IS_ENABLED(CONFIG_DEBUG_FS)



static int nbd_dbg_tasks_show(struct seq_file *s, void *unused)
{
	struct nbd_device *nbd = s->private;

	if (nbd->task_recv)
		seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv));

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%



static int nbd_dbg_tasks_open(struct inode *inode, struct file *file)
{
	return single_open(file, nbd_dbg_tasks_show, inode->i_private);
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 21 75.00% 1 50.00%
Josef Whiter 7 25.00% 1 50.00%
Total 28 100.00% 2 100.00%


static const struct file_operations nbd_dbg_tasks_ops = {
	.open = nbd_dbg_tasks_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};



static int nbd_dbg_flags_show(struct seq_file *s, void *unused)
{
	struct nbd_device *nbd = s->private;
	u32 flags = nbd->config->flags;

	seq_printf(s, "Hex: 0x%08x\n\n", flags);

	seq_puts(s, "Known flags:\n");

	if (flags & NBD_FLAG_HAS_FLAGS)
		seq_puts(s, "NBD_FLAG_HAS_FLAGS\n");
	if (flags & NBD_FLAG_READ_ONLY)
		seq_puts(s, "NBD_FLAG_READ_ONLY\n");
	if (flags & NBD_FLAG_SEND_FLUSH)
		seq_puts(s, "NBD_FLAG_SEND_FLUSH\n");
	if (flags & NBD_FLAG_SEND_FUA)
		seq_puts(s, "NBD_FLAG_SEND_FUA\n");
	if (flags & NBD_FLAG_SEND_TRIM)
		seq_puts(s, "NBD_FLAG_SEND_TRIM\n");

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 75 64.10% 2 40.00%
Markus Pargmann 29 24.79% 2 40.00%
Shaun McDowell 13 11.11% 1 20.00%
Total 117 100.00% 5 100.00%



static int nbd_dbg_flags_open(struct inode *inode, struct file *file)
{
	return single_open(file, nbd_dbg_flags_show, inode->i_private);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%


static const struct file_operations nbd_dbg_flags_ops = {
	.open = nbd_dbg_flags_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};



static int nbd_dev_dbg_init(struct nbd_device *nbd)
{
	struct dentry *dir;
	struct nbd_config *config = nbd->config;

	if (!nbd_dbg_dir)
		return -EIO;

	dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir);
	if (!dir) {
		dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n",
			nbd_name(nbd));
		return -EIO;
	}
	config->dbg_dir = dir;

	debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops);
	debugfs_create_u64("size_bytes", 0444, dir, &config->bytesize);
	debugfs_create_u32("timeout", 0444, dir, &nbd->tag_set.timeout);
	debugfs_create_u64("blocksize", 0444, dir, &config->blksize);
	debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_ops);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 82 53.59% 2 40.00%
Markus Pargmann 67 43.79% 1 20.00%
Josef Bacik 4 2.61% 2 40.00%
Total 153 100.00% 5 100.00%



static void nbd_dev_dbg_close(struct nbd_device *nbd)
{
	debugfs_remove_recursive(nbd->config->dbg_dir);
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 18 90.00% 1 50.00%
Josef Whiter 2 10.00% 1 50.00%
Total 20 100.00% 2 100.00%



static int nbd_dbg_init(void)
{
	struct dentry *dbg_dir;

	dbg_dir = debugfs_create_dir("nbd", NULL);
	if (!dbg_dir)
		return -EIO;

	nbd_dbg_dir = dbg_dir;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 38 100.00% 2 100.00%
Total 38 100.00% 2 100.00%



static void nbd_dbg_close(void)
{
	debugfs_remove_recursive(nbd_dbg_dir);
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%

#else  /* IS_ENABLED(CONFIG_DEBUG_FS) */



static int nbd_dev_dbg_init(struct nbd_device *nbd)
{
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%



static void nbd_dev_dbg_close(struct nbd_device *nbd)
{
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%



static int nbd_dbg_init(void)
{
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 11 100.00% 1 100.00%
Total 11 100.00% 1 100.00%



static void nbd_dbg_close(void)
{
}

Contributors
Person Tokens Prop Commits CommitProp
Markus Pargmann 7 100.00% 1 100.00%
Total 7 100.00% 1 100.00%

#endif



static int nbd_init_request(struct blk_mq_tag_set *set, struct request *rq,
			    unsigned int hctx_idx, unsigned int numa_node)
{
	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(rq);
	cmd->nbd = set->driver_data;
	cmd->flags = 0;
	mutex_init(&cmd->lock);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 39 66.10% 1 25.00%
Josef Whiter 14 23.73% 2 50.00%
Christoph Hellwig 6 10.17% 1 25.00%
Total 59 100.00% 4 100.00%


static const struct blk_mq_ops nbd_mq_ops = {
	.queue_rq	= nbd_queue_rq,
	.complete	= nbd_complete_rq,
	.init_request	= nbd_init_request,
	.timeout	= nbd_xmit_timeout,
};



static int nbd_dev_add(int index)
{
	struct nbd_device *nbd;
	struct gendisk *disk;
	struct request_queue *q;
	int err = -ENOMEM;

	nbd = kzalloc(sizeof(struct nbd_device), GFP_KERNEL);
	if (!nbd)
		goto out;

	disk = alloc_disk(1 << part_shift);
	if (!disk)
		goto out_free_nbd;

	if (index >= 0) {
		err = idr_alloc(&nbd_index_idr, nbd, index, index + 1,
				GFP_KERNEL);
		if (err == -ENOSPC)
			err = -EEXIST;
	} else {
		err = idr_alloc(&nbd_index_idr, nbd, 0, 0, GFP_KERNEL);
		if (err >= 0)
			index = err;
	}
	if (err < 0)
		goto out_free_disk;

	nbd->index = index;
	nbd->disk = disk;
	nbd->tag_set.ops = &nbd_mq_ops;
	nbd->tag_set.nr_hw_queues = 1;
	nbd->tag_set.queue_depth = 128;
	nbd->tag_set.numa_node = NUMA_NO_NODE;
	nbd->tag_set.cmd_size = sizeof(struct nbd_cmd);
	nbd->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
		BLK_MQ_F_SG_MERGE | BLK_MQ_F_BLOCKING;
	nbd->tag_set.driver_data = nbd;

	err = blk_mq_alloc_tag_set(&nbd->tag_set);
	if (err)
		goto out_free_idr;

	q = blk_mq_init_queue(&nbd->tag_set);
	if (IS_ERR(q)) {
		err = PTR_ERR(q);
		goto out_free_tags;
	}
	disk->queue = q;

	/*
         * Tell the block layer that we are not a rotational device
         */
	blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue);
	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, disk->queue);
	disk->queue->limits.discard_granularity = 0;
	disk->queue->limits.discard_alignment = 0;
	blk_queue_max_discard_sectors(disk->queue, 0);
	blk_queue_max_segment_size(disk->queue, UINT_MAX);
	blk_queue_max_segments(disk->queue, USHRT_MAX);
	blk_queue_max_hw_sectors(disk->queue, 65536);
	disk->queue->limits.max_sectors = 256;

	mutex_init(&nbd->config_lock);
	refcount_set(&nbd->config_refs, 0);
	refcount_set(&nbd->refs, 1);
	INIT_LIST_HEAD(&nbd->list);
	disk->major = NBD_MAJOR;
	disk->first_minor = index << part_shift;
	disk->fops = &nbd_fops;
	disk->private_data = nbd;
	sprintf(disk->disk_name, "nbd%d", index);
	add_disk(disk);
	nbd_total_devices++;
	return index;

out_free_tags:
	blk_mq_free_tag_set(&nbd->tag_set);
out_free_idr:
	idr_remove(&nbd_index_idr, index);
out_free_disk:
	put_disk(disk);
out_free_nbd:
	kfree(nbd);
out:
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 245 50.83% 5 13.16%
Josef Whiter 64 13.28% 7 18.42%
Al Viro 54 11.20% 6 15.79%
Paul Clements 20 4.15% 2 5.26%
Michal Belczyk 19 3.94% 1 2.63%
Lou Langholtz 17 3.53% 1 2.63%
Sudip Mukherjee 13 2.70% 1 2.63%
Linus Torvalds (pre-git) 13 2.70% 4 10.53%
Jeff Moyer 11 2.28% 1 2.63%
Mike Snitzer 8 1.66% 1 2.63%
Jens Axboe 6 1.24% 3 7.89%
Laurent Vivier 4 0.83% 1 2.63%
Christoph Hellwig 3 0.62% 2 5.26%
Bart Van Assche 2 0.41% 1 2.63%
Sven Wegener 2 0.41% 1 2.63%
Herbert Xu 1 0.21% 1 2.63%
Total 482 100.00% 38 100.00%



static int find_free_cb(int id, void *ptr, void *data)
{
	struct nbd_device *nbd = ptr;
	struct nbd_device **found = data;

	if (!refcount_read(&nbd->config_refs)) {
		*found = nbd;
		return 1;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 56 100.00% 1 100.00%
Total 56 100.00% 1 100.00%

/* Netlink interface. */

static struct nla_policy nbd_attr_policy[NBD_ATTR_MAX + 1] = {
	[NBD_ATTR_INDEX]		=	{ .type = NLA_U32 },
	[NBD_ATTR_SIZE_BYTES]		=	{ .type = NLA_U64 },
	[NBD_ATTR_BLOCK_SIZE_BYTES]	=	{ .type = NLA_U64 },
	[NBD_ATTR_TIMEOUT]		=	{ .type = NLA_U64 },
	[NBD_ATTR_SERVER_FLAGS]		=	{ .type = NLA_U64 },
	[NBD_ATTR_CLIENT_FLAGS]		=	{ .type = NLA_U64 },
	[NBD_ATTR_SOCKETS]		=	{ .type = NLA_NESTED},
	[NBD_ATTR_DEAD_CONN_TIMEOUT]	=	{ .type = NLA_U64 },
	[NBD_ATTR_DEVICE_LIST]		=	{ .type = NLA_NESTED},
};


static struct nla_policy nbd_sock_policy[NBD_SOCK_MAX + 1] = {
	[NBD_SOCK_FD]			=	{ .type = NLA_U32 },
};

/* We don't use this right now since we don't parse the incoming list, but we
 * still want it here so userspace knows what to expect.
 */
static struct nla_policy __attribute__((unused))

nbd_device_policy[NBD_DEVICE_ATTR_MAX + 1] = {
	[NBD_DEVICE_INDEX]		=	{ .type = NLA_U32 },
	[NBD_DEVICE_CONNECTED]		=	{ .type = NLA_U8 },
};



static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info)
{
	struct nbd_device *nbd = NULL;
	struct nbd_config *config;
	int index = -1;
	int ret;
	bool put_dev = false;

	if (!netlink_capable(skb, CAP_SYS_ADMIN))
		return -EPERM;

	if (info->attrs[NBD_ATTR_INDEX])
		index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]);
	if (!info->attrs[NBD_ATTR_SOCKETS]) {
		printk(KERN_ERR "nbd: must specify at least one socket\n");
		return -EINVAL;
	}
	if (!info->attrs[NBD_ATTR_SIZE_BYTES]) {
		printk(KERN_ERR "nbd: must specify a size in bytes for the device\n");
		return -EINVAL;
	}
again:
	mutex_lock(&nbd_index_mutex);
	if (index == -1) {
		ret = idr_for_each(&nbd_index_idr, &find_free_cb, &nbd);
		if (ret == 0) {
			int new_index;
			new_index = nbd_dev_add(-1);
			if (new_index < 0) {
				mutex_unlock(&nbd_index_mutex);
				printk(KERN_ERR "nbd: failed to add new device\n");
				return new_index;
			}
			nbd = idr_find(&nbd_index_idr, new_index);
		}
	} else {
		nbd = idr_find(&nbd_index_idr, index);
		if (!nbd) {
			ret = nbd_dev_add(index);
			if (ret < 0) {
				mutex_unlock(&nbd_index_mutex);
				printk(KERN_ERR "nbd: failed to add new device\n");
				return ret;
			}
			nbd = idr_find(&nbd_index_idr, index);
		}
	}
	if (!nbd) {
		printk(KERN_ERR "nbd: couldn't find device at index %d\n",
		       index);
		mutex_unlock(&nbd_index_mutex);
		return -EINVAL;
	}
	if (!refcount_inc_not_zero(&nbd->refs)) {
		mutex_unlock(&nbd_index_mutex);
		if (index == -1)
			goto again;
		printk(KERN_ERR "nbd: device at index %d is going down\n",
		       index);
		return -EINVAL;
	}
	mutex_unlock(&nbd_index_mutex);

	mutex_lock(&nbd->config_lock);
	if (refcount_read(&nbd->config_refs)) {
		mutex_unlock(&nbd->config_lock);
		nbd_put(nbd);
		if (index == -1)
			goto again;
		printk(KERN_ERR "nbd: nbd%d already in use\n", index);
		return -EBUSY;
	}
	if (WARN_ON(nbd->config)) {
		mutex_unlock(&nbd->config_lock);
		nbd_put(nbd);
		return -EINVAL;
	}
	config = nbd->config = nbd_alloc_config();
	if (!nbd->config) {
		mutex_unlock(&nbd->config_lock);
		nbd_put(nbd);
		printk(KERN_ERR "nbd: couldn't allocate config\n");
		return -ENOMEM;
	}
	refcount_set(&nbd->config_refs, 1);
	set_bit(NBD_BOUND, &config->runtime_flags);

	if (info->attrs[NBD_ATTR_SIZE_BYTES]) {
		u64 bytes = nla_get_u64(info->attrs[NBD_ATTR_SIZE_BYTES]);
		nbd_size_set(nbd, config->blksize,
			     div64_u64(bytes, config->blksize));
	}
	if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) {
		u64 bsize =
			nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
		nbd_size_set(nbd, bsize, div64_u64(config->bytesize, bsize));
	}
	if (info->attrs[NBD_ATTR_TIMEOUT]) {
		u64 timeout = nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]);
		nbd->tag_set.timeout = timeout * HZ;
		blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ);
	}
	if (info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]) {
		config->dead_conn_timeout =
			nla_get_u64(info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]);
		config->dead_conn_timeout *= HZ;
	}
	if (info->attrs[NBD_ATTR_SERVER_FLAGS])
		config->flags =
			nla_get_u64(info->attrs[NBD_ATTR_SERVER_FLAGS]);
	if (info->attrs[NBD_ATTR_CLIENT_FLAGS]) {
		u64 flags = nla_get_u64(info->attrs[NBD_ATTR_CLIENT_FLAGS]);
		if (flags & NBD_CFLAG_DESTROY_ON_DISCONNECT) {
			set_bit(NBD_DESTROY_ON_DISCONNECT,
				&config->runtime_flags);
			put_dev = true;
		}
		if (flags & NBD_CFLAG_DISCONNECT_ON_CLOSE) {
			set_bit(NBD_DISCONNECT_ON_CLOSE,
				&config->runtime_flags);
		}
	}

	if (info->attrs[NBD_ATTR_SOCKETS]) {
		struct nlattr *attr;
		int rem, fd;

		nla_for_each_nested(attr, info->attrs[NBD_ATTR_SOCKETS],
				    rem) {
			struct nlattr *socks[NBD_SOCK_MAX+1];

			if (nla_type(attr) != NBD_SOCK_ITEM) {
				printk(KERN_ERR "nbd: socks must be embedded in a SOCK_ITEM attr\n");
				ret = -EINVAL;
				goto out;
			}
			ret = nla_parse_nested(socks, NBD_SOCK_MAX, attr,
					       nbd_sock_policy, info->extack);
			if (ret != 0) {
				printk(KERN_ERR "nbd: error processing sock list\n");
				ret = -EINVAL;
				goto out;
			}
			if (!socks[NBD_SOCK_FD])
				continue;
			fd = (int)nla_get_u32(socks[NBD_SOCK_FD]);
			ret = nbd_add_socket(nbd, fd, true);
			if (ret)
				goto out;
		}
	}
	ret = nbd_start_device(nbd);
out:
	mutex_unlock(&nbd->config_lock);
	if (!ret) {
		set_bit(NBD_HAS_CONFIG_REF, &config->runtime_flags);
		refcount_inc(&nbd->config_refs);
		nbd_connect_reply(info, nbd->index);
	}
	nbd_config_put(nbd);
	if (put_dev)
		nbd_put(nbd);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 870 92.55% 5 55.56%
Josef Bacik 47 5.00% 1 11.11%
Doron Roberts-Kedes 18 1.91% 1 11.11%
Linus Torvalds 4 0.43% 1 11.11%
Gustavo A. R. Silva 1 0.11% 1 11.11%
Total 940 100.00% 9 100.00%



static void nbd_disconnect_and_put(struct nbd_device *nbd)
{
	mutex_lock(&nbd->config_lock);
	nbd_disconnect(nbd);
	nbd_clear_sock(nbd);
	mutex_unlock(&nbd->config_lock);
	if (test_and_clear_bit(NBD_HAS_CONFIG_REF,
			       &nbd->config->runtime_flags))
		nbd_config_put(nbd);
}

Contributors
Person Tokens Prop Commits CommitProp
Doron Roberts-Kedes 56 100.00% 1 100.00%
Total 56 100.00% 1 100.00%



static int nbd_genl_disconnect(struct sk_buff *skb, struct genl_info *info)
{
	struct nbd_device *nbd;
	int index;

	if (!netlink_capable(skb, CAP_SYS_ADMIN))
		return -EPERM;

	if (!info->attrs[NBD_ATTR_INDEX]) {
		printk(KERN_ERR "nbd: must specify an index to disconnect\n");
		return -EINVAL;
	}
	index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]);
	mutex_lock(&nbd_index_mutex);
	nbd = idr_find(&nbd_index_idr, index);
	if (!nbd) {
		mutex_unlock(&nbd_index_mutex);
		printk(KERN_ERR "nbd: couldn't find device at index %d\n",
		       index);
		return -EINVAL;
	}
	if (!refcount_inc_not_zero(&nbd->refs)) {
		mutex_unlock(&nbd_index_mutex);
		printk(KERN_ERR "nbd: device at index %d is going down\n",
		       index);
		return -EINVAL;
	}
	mutex_unlock(&nbd_index_mutex);
	if (!refcount_inc_not_zero(&nbd->config_refs)) {
		nbd_put(nbd);
		return 0;
	}
	nbd_disconnect_and_put(nbd);
	nbd_config_put(nbd);
	nbd_put(nbd);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 160 84.66% 3 37.50%
Josef Bacik 23 12.17% 1 12.50%
Linus Torvalds (pre-git) 3 1.59% 1 12.50%
Doron Roberts-Kedes 1 0.53% 1 12.50%
Linus Torvalds 1 0.53% 1 12.50%
Al Viro 1 0.53% 1 12.50%
Total 189 100.00% 8 100.00%



static int nbd_genl_reconfigure(struct sk_buff *skb, struct genl_info *info)
{
	struct nbd_device *nbd = NULL;
	struct nbd_config *config;
	int index;
	int ret = 0;
	bool put_dev = false;

	if (!netlink_capable(skb, CAP_SYS_ADMIN))
		return -EPERM;

	if (!info->attrs[NBD_ATTR_INDEX]) {
		printk(KERN_ERR "nbd: must specify a device to reconfigure\n");
		return -EINVAL;
	}
	index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]);
	mutex_lock(&nbd_index_mutex);
	nbd = idr_find(&nbd_index_idr, index);
	if (!nbd) {
		mutex_unlock(&nbd_index_mutex);
		printk(KERN_ERR "nbd: couldn't find a device at index %d\n",
		       index);
		return -EINVAL;
	}
	if (!refcount_inc_not_zero(&nbd->refs)) {
		mutex_unlock(&nbd_index_mutex);
		printk(KERN_ERR "nbd: device at index %d is going down\n",
		       index);
		return -EINVAL;
	}
	mutex_unlock(&nbd_index_mutex);

	if (!refcount_inc_not_zero(&nbd->config_refs)) {
		dev_err(nbd_to_dev(nbd),
			"not configured, cannot reconfigure\n");
		nbd_put(nbd);
		return -EINVAL;
	}

	mutex_lock(&nbd->config_lock);
	config = nbd->config;
	if (!test_bit(NBD_BOUND, &config->runtime_flags) ||
	    !nbd->task_recv) {
		dev_err(nbd_to_dev(nbd),
			"not configured, cannot reconfigure\n");
		ret = -EINVAL;
		goto out;
	}

	if (info->attrs[NBD_ATTR_TIMEOUT]) {
		u64 timeout = nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]);
		nbd->tag_set.timeout = timeout * HZ;
		blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ);
	}
	if (info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]) {
		config->dead_conn_timeout =
			nla_get_u64(info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]);
		config->dead_conn_timeout *= HZ;
	}
	if (info->attrs[NBD_ATTR_CLIENT_FLAGS]) {
		u64 flags = nla_get_u64(info->attrs[NBD_ATTR_CLIENT_FLAGS]);
		if (flags & NBD_CFLAG_DESTROY_ON_DISCONNECT) {
			if (!test_and_set_bit(NBD_DESTROY_ON_DISCONNECT,
					      &config->runtime_flags))
				put_dev = true;
		} else {
			if (test_and_clear_bit(NBD_DESTROY_ON_DISCONNECT,
					       &config->runtime_flags))
				refcount_inc(&nbd->refs);
		}

		if (flags & NBD_CFLAG_DISCONNECT_ON_CLOSE) {
			set_bit(NBD_DISCONNECT_ON_CLOSE,
					&config->runtime_flags);
		} else {
			clear_bit(NBD_DISCONNECT_ON_CLOSE,
					&config->runtime_flags);
		}
	}

	if (info->attrs[NBD_ATTR_SOCKETS]) {
		struct nlattr *attr;
		int rem, fd;

		nla_for_each_nested(attr, info->attrs[NBD_ATTR_SOCKETS],
				    rem) {
			struct nlattr *socks[NBD_SOCK_MAX+1];

			if (nla_type(attr) != NBD_SOCK_ITEM) {
				printk(KERN_ERR "nbd: socks must be embedded in a SOCK_ITEM attr\n");
				ret = -EINVAL;
				goto out;
			}
			ret = nla_parse_nested(socks, NBD_SOCK_MAX, attr,
					       nbd_sock_policy, info->extack);
			if (ret != 0) {
				printk(KERN_ERR "nbd: error processing sock list\n");
				ret = -EINVAL;
				goto out;
			}
			if (!socks[NBD_SOCK_FD])
				continue;
			fd = (int)nla_get_u32(socks[NBD_SOCK_FD]);
			ret = nbd_reconnect_socket(nbd, fd);
			if (ret) {
				if (ret == -ENOSPC)
					ret = 0;
				goto out;
			}
			dev_info(nbd_to_dev(nbd), "reconnected socket\n");
		}
	}
out:
	mutex_unlock(&nbd->config_lock);
	nbd_config_put(nbd);
	nbd_put(nbd);
	if (put_dev)
		nbd_put(nbd);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 589 93.49% 5 71.43%
Doron Roberts-Kedes 37 5.87% 1 14.29%
Linus Torvalds 4 0.63% 1 14.29%
Total 630 100.00% 7 100.00%


static const struct genl_ops nbd_connect_genl_ops[] = {
	{
		.cmd	= NBD_CMD_CONNECT,
		.policy	= nbd_attr_policy,
		.doit	= nbd_genl_connect,
        },
	{
		.cmd	= NBD_CMD_DISCONNECT,
		.policy	= nbd_attr_policy,
		.doit	= nbd_genl_disconnect,
        },
	{
		.cmd	= NBD_CMD_RECONFIGURE,
		.policy	= nbd_attr_policy,
		.doit	= nbd_genl_reconfigure,
        },
	{
		.cmd	= NBD_CMD_STATUS,
		.policy	= nbd_attr_policy,
		.doit	= nbd_genl_status,
        },
};


static const struct genl_multicast_group nbd_mcast_grps[] = {
	{ .name = NBD_GENL_MCAST_GROUP_NAME, },
};


static struct genl_family nbd_genl_family __ro_after_init = {
	.hdrsize	= 0,
	.name		= NBD_GENL_FAMILY_NAME,
	.version	= NBD_GENL_VERSION,
	.module		= THIS_MODULE,
	.ops		= nbd_connect_genl_ops,
	.n_ops		= ARRAY_SIZE(nbd_connect_genl_ops),
	.maxattr	= NBD_ATTR_MAX,
	.mcgrps		= nbd_mcast_grps,
	.n_mcgrps	= ARRAY_SIZE(nbd_mcast_grps),
};



static int populate_nbd_status(struct nbd_device *nbd, struct sk_buff *reply)
{
	struct nlattr *dev_opt;
	u8 connected = 0;
	int ret;

	/* This is a little racey, but for status it's ok.  The
         * reason we don't take a ref here is because we can't
         * take a ref in the index == -1 case as we would need
         * to put under the nbd_index_mutex, which could
         * deadlock if we are configured to remove ourselves
         * once we're disconnected.
         */
	if (refcount_read(&nbd->config_refs))
		connected = 1;
	dev_opt = nla_nest_start(reply, NBD_DEVICE_ITEM);
	if (!dev_opt)
		return -EMSGSIZE;
	ret = nla_put_u32(reply, NBD_DEVICE_INDEX, nbd->index);
	if (ret)
		return -EMSGSIZE;
	ret = nla_put_u8(reply, NBD_DEVICE_CONNECTED,
			 connected);
	if (ret)
		return -EMSGSIZE;
	nla_nest_end(reply, dev_opt);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 112 100.00% 1 100.00%
Total 112 100.00% 1 100.00%



static int status_cb(int id, void *ptr, void *data)
{
	struct nbd_device *nbd = ptr;
	return populate_nbd_status(nbd, (struct sk_buff *)data);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr *dev_list;
	struct sk_buff *reply;
	void *reply_head;
	size_t msg_size;
	int index = -1;
	int ret = -ENOMEM;

	if (info->attrs[NBD_ATTR_INDEX])
		index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]);

	mutex_lock(&nbd_index_mutex);

	msg_size = nla_total_size(nla_attr_size(sizeof(u32)) +
				  nla_attr_size(sizeof(u8)));
	msg_size *= (index == -1) ? nbd_total_devices : 1;

	reply = genlmsg_new(msg_size, GFP_KERNEL);
	if (!reply)
		goto out;
	reply_head = genlmsg_put_reply(reply, info, &nbd_genl_family, 0,
				       NBD_CMD_STATUS);
	if (!reply_head) {
		nlmsg_free(reply);
		goto out;
	}

	dev_list = nla_nest_start(reply, NBD_ATTR_DEVICE_LIST);
	if (index == -1) {
		ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
		if (ret) {
			nlmsg_free(reply);
			goto out;
		}
	} else {
		struct nbd_device *nbd;
		nbd = idr_find(&nbd_index_idr, index);
		if (nbd) {
			ret = populate_nbd_status(nbd, reply);
			if (ret) {
				nlmsg_free(reply);
				goto out;
			}
		}
	}
	nla_nest_end(reply, dev_list);
	genlmsg_end(reply, reply_head);
	genlmsg_reply(reply, info);
	ret = 0;
out:
	mutex_unlock(&nbd_index_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 282 100.00% 1 100.00%
Total 282 100.00% 1 100.00%



static void nbd_connect_reply(struct genl_info *info, int index)
{
	struct sk_buff *skb;
	void *msg_head;
	int ret;

	skb = genlmsg_new(nla_total_size(sizeof(u32)), GFP_KERNEL);
	if (!skb)
		return;
	msg_head = genlmsg_put_reply(skb, info, &nbd_genl_family, 0,
				     NBD_CMD_CONNECT);
	if (!msg_head) {
		nlmsg_free(skb);
		return;
	}
	ret = nla_put_u32(skb, NBD_ATTR_INDEX, index);
	if (ret) {
		nlmsg_free(skb);
		return;
	}
	genlmsg_end(skb, msg_head);
	genlmsg_reply(skb, info);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 113 100.00% 1 100.00%
Total 113 100.00% 1 100.00%



static void nbd_mcast_index(int index)
{
	struct sk_buff *skb;
	void *msg_head;
	int ret;

	skb = genlmsg_new(nla_total_size(sizeof(u32)), GFP_KERNEL);
	if (!skb)
		return;
	msg_head = genlmsg_put(skb, 0, 0, &nbd_genl_family, 0,
				     NBD_CMD_LINK_DEAD);
	if (!msg_head) {
		nlmsg_free(skb);
		return;
	}
	ret = nla_put_u32(skb, NBD_ATTR_INDEX, index);
	if (ret) {
		nlmsg_free(skb);
		return;
	}
	genlmsg_end(skb, msg_head);
	genlmsg_multicast(&nbd_genl_family, skb, 0, 0, GFP_KERNEL);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 117 100.00% 1 100.00%
Total 117 100.00% 1 100.00%



static void nbd_dead_link_work(struct work_struct *work)
{
	struct link_dead_args *args = container_of(work, struct link_dead_args,
						   work);
	nbd_mcast_index(args->index);
	kfree(args);
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%



static int __init nbd_init(void)
{
	int i;

	BUILD_BUG_ON(sizeof(struct nbd_request) != 28);

	if (max_part < 0) {
		printk(KERN_ERR "nbd: max_part must be >= 0\n");
		return -EINVAL;
	}

	part_shift = 0;
	if (max_part > 0) {
		part_shift = fls(max_part);

		/*
                 * Adjust max_part according to part_shift as it is exported
                 * to user space so that user can know the max number of
                 * partition kernel should be able to manage.
                 *
                 * Note that -1 is required because partition 0 is reserved
                 * for the whole disk.
                 */
		max_part = (1UL << part_shift) - 1;
	}

	if ((1UL << part_shift) > DISK_MAX_PARTS)
		return -EINVAL;

	if (nbds_max > 1UL << (MINORBITS - part_shift))
		return -EINVAL;
	recv_workqueue = alloc_workqueue("knbd-recv",
					 WQ_MEM_RECLAIM | WQ_HIGHPRI |
					 WQ_UNBOUND, 0);
	if (!recv_workqueue)
		return -ENOMEM;

	if (register_blkdev(NBD_MAJOR, "nbd")) {
		destroy_workqueue(recv_workqueue);
		return -EIO;
	}

	if (genl_register_family(&nbd_genl_family)) {
		unregister_blkdev(NBD_MAJOR, "nbd");
		destroy_workqueue(recv_workqueue);
		return -EINVAL;
	}
	nbd_dbg_init();

	mutex_lock(&nbd_index_mutex);
	for (i = 0; i < nbds_max; i++)
		nbd_dev_add(i);
	mutex_unlock(&nbd_index_mutex);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 100 48.31% 2 28.57%
Josef Whiter 90 43.48% 1 14.29%
Al Viro 12 5.80% 1 14.29%
Markus Pargmann 2 0.97% 1 14.29%
Dan Melnic 2 0.97% 1 14.29%
Lars Marowsky-Bree 1 0.48% 1 14.29%
Total 207 100.00% 7 100.00%



static int nbd_exit_cb(int id, void *ptr, void *data)
{
	struct list_head *list = (struct list_head *)data;
	struct nbd_device *nbd = ptr;

	list_add_tail(&nbd->list, list);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Bacik 22 44.90% 1 20.00%
Josef Whiter 20 40.82% 1 20.00%
Lou Langholtz 4 8.16% 1 20.00%
Al Viro 3 6.12% 2 40.00%
Total 49 100.00% 5 100.00%



static void __exit nbd_cleanup(void)
{
	struct nbd_device *nbd;
	LIST_HEAD(del_list);

	nbd_dbg_close();

	mutex_lock(&nbd_index_mutex);
	idr_for_each(&nbd_index_idr, &nbd_exit_cb, &del_list);
	mutex_unlock(&nbd_index_mutex);

	while (!list_empty(&del_list)) {
		nbd = list_first_entry(&del_list, struct nbd_device, list);
		list_del_init(&nbd->list);
		if (refcount_read(&nbd->refs) != 1)
			printk(KERN_ERR "nbd: possibly leaking a device\n");
		nbd_put(nbd);
	}

	idr_destroy(&nbd_index_idr);
	genl_unregister_family(&nbd_genl_family);
	destroy_workqueue(recv_workqueue);
	unregister_blkdev(NBD_MAJOR, "nbd");
}

Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 85 68.00% 3 27.27%
Josef Bacik 28 22.40% 3 27.27%
Linus Torvalds (pre-git) 9 7.20% 3 27.27%
Lou Langholtz 2 1.60% 1 9.09%
Christoph Hellwig 1 0.80% 1 9.09%
Total 125 100.00% 11 100.00%

module_init(nbd_init);
module_exit(nbd_cleanup);

MODULE_DESCRIPTION("Network Block Device");
MODULE_LICENSE("GPL");

module_param(nbds_max, int, 0444);
MODULE_PARM_DESC(nbds_max, "number of network block devices to initialize (default: 16)");
module_param(max_part, int, 0444);
MODULE_PARM_DESC(max_part, "number of partitions per device (default: 16)");
Overall Contributors
Person Tokens Prop Commits CommitProp
Josef Whiter 6640 58.97% 19 9.95%
Josef Bacik 1952 17.34% 36 18.85%
Markus Pargmann 697 6.19% 18 9.42%
Linus Torvalds (pre-git) 399 3.54% 13 6.81%
Al Viro 245 2.18% 8 4.19%
Christoph Hellwig 173 1.54% 12 6.28%
Andrew Morton 165 1.47% 7 3.66%
Doron Roberts-Kedes 163 1.45% 1 0.52%
Paul Clements 88 0.78% 8 4.19%
Linus Torvalds 79 0.70% 8 4.19%
Kevin Vigor 68 0.60% 2 1.05%
Shaun McDowell 55 0.49% 1 0.52%
Jens Axboe 52 0.46% 5 2.62%
Laurent Vivier 43 0.38% 2 1.05%
Américo Wang 40 0.36% 1 0.52%
Mike Snitzer 35 0.31% 2 1.05%
Michal Feix 33 0.29% 2 1.05%
Lou Langholtz 32 0.28% 1 0.52%
Pavel Machek 32 0.28% 2 1.05%
Wanlong Gao 30 0.27% 1 0.52%
Ilya Dryomov 27 0.24% 2 1.05%
Lars Marowsky-Bree 23 0.20% 1 0.52%
Michal Belczyk 19 0.17% 1 0.52%
Herbert Xu 19 0.17% 1 0.52%
Tejun Heo 15 0.13% 3 1.57%
Alex Bligh 14 0.12% 1 0.52%
Sudip Mukherjee 13 0.12% 1 0.52%
Neil Brown 12 0.11% 1 0.52%
Vlastimil Babka 11 0.10% 1 0.52%
Jeff Moyer 11 0.10% 1 0.52%
Namhyung Kim 9 0.08% 3 1.57%
Dave Jones 8 0.07% 1 0.52%
Mel Gorman 8 0.07% 1 0.52%
Kent Overstreet 5 0.04% 2 1.05%
Sven Wegener 5 0.04% 1 0.52%
Ratna Manoj Bolla 5 0.04% 1 0.52%
Arnd Bergmann 4 0.04% 2 1.05%
Michael Christie 4 0.04% 2 1.05%
Bart Van Assche 4 0.04% 1 0.52%
Trond Myklebust 3 0.03% 1 0.52%
Arnaldo Carvalho de Melo 3 0.03% 1 0.52%
Adrian Bunk 3 0.03% 2 1.05%
Sagi Grimberg 2 0.02% 1 0.52%
Dan Melnic 2 0.02% 1 0.52%
Kiyoshi Ueda 2 0.02% 1 0.52%
Eric Biggers 1 0.01% 1 0.52%
Joe Perches 1 0.01% 1 0.52%
Bhumika Goyal 1 0.01% 1 0.52%
Gustavo A. R. Silva 1 0.01% 1 0.52%
Hani Benhabiles 1 0.01% 1 0.52%
Ingo Molnar 1 0.01% 1 0.52%
Paolo Bonzini 1 0.01% 1 0.52%
David S. Miller 1 0.01% 1 0.52%
Total 11260 100.00% 191 100.00%
Directory: drivers/block

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Markus Pargmann	14	63.64%	1	50.00%
Andrew Morton	8	36.36%	1	50.00%
Total	22	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.18 drivers/block/nbd.c

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