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nbd: rename the nbd_device variable from lo to nbd
rename the nbd_device variable from "lo" to "nbd", since "lo" is just a name copied from loop.c. Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wanlong Gao
Linus Torvalds
parent
cf3f89214e
commit
f4507164e7
@ -39,7 +39,7 @@
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#include <linux/nbd.h>
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#define LO_MAGIC 0x68797548
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#define NBD_MAGIC 0x68797548
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#ifdef NDEBUG
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#define dprintk(flags, fmt...)
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@ -116,7 +116,7 @@ static void nbd_end_request(struct request *req)
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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static void sock_shutdown(struct nbd_device *lo, int lock)
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static void sock_shutdown(struct nbd_device *nbd, int lock)
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{
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/* Forcibly shutdown the socket causing all listeners
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* to error
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@ -125,14 +125,14 @@ static void sock_shutdown(struct nbd_device *lo, int lock)
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* there should be a more generic interface rather than
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* calling socket ops directly here */
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if (lock)
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mutex_lock(&lo->tx_lock);
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if (lo->sock) {
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dev_warn(disk_to_dev(lo->disk), "shutting down socket\n");
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kernel_sock_shutdown(lo->sock, SHUT_RDWR);
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lo->sock = NULL;
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mutex_lock(&nbd->tx_lock);
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if (nbd->sock) {
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dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n");
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kernel_sock_shutdown(nbd->sock, SHUT_RDWR);
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nbd->sock = NULL;
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}
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if (lock)
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mutex_unlock(&lo->tx_lock);
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mutex_unlock(&nbd->tx_lock);
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}
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static void nbd_xmit_timeout(unsigned long arg)
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@ -147,17 +147,17 @@ static void nbd_xmit_timeout(unsigned long arg)
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/*
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* Send or receive packet.
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*/
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static int sock_xmit(struct nbd_device *lo, int send, void *buf, int size,
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static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size,
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int msg_flags)
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{
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struct socket *sock = lo->sock;
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struct socket *sock = nbd->sock;
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int result;
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struct msghdr msg;
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struct kvec iov;
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sigset_t blocked, oldset;
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if (unlikely(!sock)) {
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dev_err(disk_to_dev(lo->disk),
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dev_err(disk_to_dev(nbd->disk),
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"Attempted %s on closed socket in sock_xmit\n",
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(send ? "send" : "recv"));
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return -EINVAL;
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@ -181,15 +181,15 @@ static int sock_xmit(struct nbd_device *lo, int send, void *buf, int size,
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if (send) {
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struct timer_list ti;
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if (lo->xmit_timeout) {
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if (nbd->xmit_timeout) {
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init_timer(&ti);
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ti.function = nbd_xmit_timeout;
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ti.data = (unsigned long)current;
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ti.expires = jiffies + lo->xmit_timeout;
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ti.expires = jiffies + nbd->xmit_timeout;
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add_timer(&ti);
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}
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result = kernel_sendmsg(sock, &msg, &iov, 1, size);
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if (lo->xmit_timeout)
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if (nbd->xmit_timeout)
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del_timer_sync(&ti);
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} else
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result = kernel_recvmsg(sock, &msg, &iov, 1, size,
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@ -201,7 +201,7 @@ static int sock_xmit(struct nbd_device *lo, int send, void *buf, int size,
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task_pid_nr(current), current->comm,
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dequeue_signal_lock(current, ¤t->blocked, &info));
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result = -EINTR;
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sock_shutdown(lo, !send);
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sock_shutdown(nbd, !send);
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break;
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}
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@ -219,18 +219,19 @@ static int sock_xmit(struct nbd_device *lo, int send, void *buf, int size,
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return result;
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}
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static inline int sock_send_bvec(struct nbd_device *lo, struct bio_vec *bvec,
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static inline int sock_send_bvec(struct nbd_device *nbd, struct bio_vec *bvec,
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int flags)
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{
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int result;
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void *kaddr = kmap(bvec->bv_page);
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result = sock_xmit(lo, 1, kaddr + bvec->bv_offset, bvec->bv_len, flags);
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result = sock_xmit(nbd, 1, kaddr + bvec->bv_offset,
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bvec->bv_len, flags);
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kunmap(bvec->bv_page);
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return result;
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}
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/* always call with the tx_lock held */
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static int nbd_send_req(struct nbd_device *lo, struct request *req)
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static int nbd_send_req(struct nbd_device *nbd, struct request *req)
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{
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int result, flags;
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struct nbd_request request;
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@ -243,14 +244,14 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
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memcpy(request.handle, &req, sizeof(req));
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dprintk(DBG_TX, "%s: request %p: sending control (%s@%llu,%uB)\n",
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lo->disk->disk_name, req,
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nbd->disk->disk_name, req,
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nbdcmd_to_ascii(nbd_cmd(req)),
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(unsigned long long)blk_rq_pos(req) << 9,
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blk_rq_bytes(req));
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result = sock_xmit(lo, 1, &request, sizeof(request),
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result = sock_xmit(nbd, 1, &request, sizeof(request),
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(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
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if (result <= 0) {
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dev_err(disk_to_dev(lo->disk),
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dev_err(disk_to_dev(nbd->disk),
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"Send control failed (result %d)\n", result);
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goto error_out;
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}
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@ -267,10 +268,10 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
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if (!rq_iter_last(req, iter))
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flags = MSG_MORE;
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dprintk(DBG_TX, "%s: request %p: sending %d bytes data\n",
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lo->disk->disk_name, req, bvec->bv_len);
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result = sock_send_bvec(lo, bvec, flags);
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nbd->disk->disk_name, req, bvec->bv_len);
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result = sock_send_bvec(nbd, bvec, flags);
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if (result <= 0) {
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dev_err(disk_to_dev(lo->disk),
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dev_err(disk_to_dev(nbd->disk),
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"Send data failed (result %d)\n",
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result);
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goto error_out;
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@ -283,25 +284,25 @@ error_out:
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return -EIO;
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}
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static struct request *nbd_find_request(struct nbd_device *lo,
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static struct request *nbd_find_request(struct nbd_device *nbd,
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struct request *xreq)
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{
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struct request *req, *tmp;
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int err;
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err = wait_event_interruptible(lo->active_wq, lo->active_req != xreq);
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err = wait_event_interruptible(nbd->active_wq, nbd->active_req != xreq);
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if (unlikely(err))
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goto out;
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spin_lock(&lo->queue_lock);
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list_for_each_entry_safe(req, tmp, &lo->queue_head, queuelist) {
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spin_lock(&nbd->queue_lock);
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list_for_each_entry_safe(req, tmp, &nbd->queue_head, queuelist) {
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if (req != xreq)
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continue;
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list_del_init(&req->queuelist);
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spin_unlock(&lo->queue_lock);
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spin_unlock(&nbd->queue_lock);
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return req;
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}
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spin_unlock(&lo->queue_lock);
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spin_unlock(&nbd->queue_lock);
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err = -ENOENT;
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@ -309,78 +310,78 @@ out:
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return ERR_PTR(err);
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}
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static inline int sock_recv_bvec(struct nbd_device *lo, struct bio_vec *bvec)
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static inline int sock_recv_bvec(struct nbd_device *nbd, struct bio_vec *bvec)
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{
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int result;
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void *kaddr = kmap(bvec->bv_page);
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result = sock_xmit(lo, 0, kaddr + bvec->bv_offset, bvec->bv_len,
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result = sock_xmit(nbd, 0, kaddr + bvec->bv_offset, bvec->bv_len,
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MSG_WAITALL);
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kunmap(bvec->bv_page);
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return result;
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}
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/* NULL returned = something went wrong, inform userspace */
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static struct request *nbd_read_stat(struct nbd_device *lo)
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static struct request *nbd_read_stat(struct nbd_device *nbd)
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{
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int result;
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struct nbd_reply reply;
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struct request *req;
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reply.magic = 0;
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result = sock_xmit(lo, 0, &reply, sizeof(reply), MSG_WAITALL);
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result = sock_xmit(nbd, 0, &reply, sizeof(reply), MSG_WAITALL);
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if (result <= 0) {
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dev_err(disk_to_dev(lo->disk),
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dev_err(disk_to_dev(nbd->disk),
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"Receive control failed (result %d)\n", result);
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goto harderror;
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}
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if (ntohl(reply.magic) != NBD_REPLY_MAGIC) {
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dev_err(disk_to_dev(lo->disk), "Wrong magic (0x%lx)\n",
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dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n",
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(unsigned long)ntohl(reply.magic));
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result = -EPROTO;
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goto harderror;
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}
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req = nbd_find_request(lo, *(struct request **)reply.handle);
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req = nbd_find_request(nbd, *(struct request **)reply.handle);
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if (IS_ERR(req)) {
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result = PTR_ERR(req);
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if (result != -ENOENT)
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goto harderror;
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dev_err(disk_to_dev(lo->disk), "Unexpected reply (%p)\n",
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dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%p)\n",
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reply.handle);
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result = -EBADR;
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goto harderror;
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}
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if (ntohl(reply.error)) {
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dev_err(disk_to_dev(lo->disk), "Other side returned error (%d)\n",
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dev_err(disk_to_dev(nbd->disk), "Other side returned error (%d)\n",
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ntohl(reply.error));
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req->errors++;
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return req;
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}
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dprintk(DBG_RX, "%s: request %p: got reply\n",
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lo->disk->disk_name, req);
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nbd->disk->disk_name, req);
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if (nbd_cmd(req) == NBD_CMD_READ) {
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struct req_iterator iter;
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struct bio_vec *bvec;
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rq_for_each_segment(bvec, req, iter) {
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result = sock_recv_bvec(lo, bvec);
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result = sock_recv_bvec(nbd, bvec);
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if (result <= 0) {
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dev_err(disk_to_dev(lo->disk), "Receive data failed (result %d)\n",
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dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n",
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result);
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req->errors++;
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return req;
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}
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dprintk(DBG_RX, "%s: request %p: got %d bytes data\n",
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lo->disk->disk_name, req, bvec->bv_len);
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nbd->disk->disk_name, req, bvec->bv_len);
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}
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}
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return req;
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harderror:
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lo->harderror = result;
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nbd->harderror = result;
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return NULL;
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}
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@ -398,48 +399,48 @@ static struct device_attribute pid_attr = {
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.show = pid_show,
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};
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static int nbd_do_it(struct nbd_device *lo)
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static int nbd_do_it(struct nbd_device *nbd)
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{
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struct request *req;
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int ret;
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BUG_ON(lo->magic != LO_MAGIC);
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BUG_ON(nbd->magic != NBD_MAGIC);
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lo->pid = task_pid_nr(current);
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ret = device_create_file(disk_to_dev(lo->disk), &pid_attr);
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nbd->pid = task_pid_nr(current);
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ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr);
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if (ret) {
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dev_err(disk_to_dev(lo->disk), "device_create_file failed!\n");
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lo->pid = 0;
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dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n");
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nbd->pid = 0;
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return ret;
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}
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while ((req = nbd_read_stat(lo)) != NULL)
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while ((req = nbd_read_stat(nbd)) != NULL)
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nbd_end_request(req);
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device_remove_file(disk_to_dev(lo->disk), &pid_attr);
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lo->pid = 0;
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device_remove_file(disk_to_dev(nbd->disk), &pid_attr);
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nbd->pid = 0;
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return 0;
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}
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static void nbd_clear_que(struct nbd_device *lo)
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static void nbd_clear_que(struct nbd_device *nbd)
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{
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struct request *req;
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BUG_ON(lo->magic != LO_MAGIC);
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BUG_ON(nbd->magic != NBD_MAGIC);
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/*
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* Because we have set lo->sock to NULL under the tx_lock, all
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* Because we have set nbd->sock to NULL under the tx_lock, all
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* modifications to the list must have completed by now. For
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* the same reason, the active_req must be NULL.
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*
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* As a consequence, we don't need to take the spin lock while
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* purging the list here.
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*/
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BUG_ON(lo->sock);
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BUG_ON(lo->active_req);
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BUG_ON(nbd->sock);
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BUG_ON(nbd->active_req);
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while (!list_empty(&lo->queue_head)) {
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req = list_entry(lo->queue_head.next, struct request,
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while (!list_empty(&nbd->queue_head)) {
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req = list_entry(nbd->queue_head.next, struct request,
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queuelist);
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list_del_init(&req->queuelist);
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req->errors++;
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@ -448,7 +449,7 @@ static void nbd_clear_que(struct nbd_device *lo)
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}
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static void nbd_handle_req(struct nbd_device *lo, struct request *req)
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static void nbd_handle_req(struct nbd_device *nbd, struct request *req)
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{
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if (req->cmd_type != REQ_TYPE_FS)
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goto error_out;
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@ -456,8 +457,8 @@ static void nbd_handle_req(struct nbd_device *lo, struct request *req)
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nbd_cmd(req) = NBD_CMD_READ;
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if (rq_data_dir(req) == WRITE) {
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nbd_cmd(req) = NBD_CMD_WRITE;
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if (lo->flags & NBD_READ_ONLY) {
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dev_err(disk_to_dev(lo->disk),
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if (nbd->flags & NBD_READ_ONLY) {
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dev_err(disk_to_dev(nbd->disk),
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"Write on read-only\n");
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goto error_out;
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}
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@ -465,29 +466,29 @@ static void nbd_handle_req(struct nbd_device *lo, struct request *req)
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req->errors = 0;
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mutex_lock(&lo->tx_lock);
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if (unlikely(!lo->sock)) {
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mutex_unlock(&lo->tx_lock);
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dev_err(disk_to_dev(lo->disk),
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mutex_lock(&nbd->tx_lock);
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if (unlikely(!nbd->sock)) {
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mutex_unlock(&nbd->tx_lock);
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dev_err(disk_to_dev(nbd->disk),
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"Attempted send on closed socket\n");
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goto error_out;
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}
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lo->active_req = req;
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nbd->active_req = req;
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if (nbd_send_req(lo, req) != 0) {
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dev_err(disk_to_dev(lo->disk), "Request send failed\n");
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if (nbd_send_req(nbd, req) != 0) {
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dev_err(disk_to_dev(nbd->disk), "Request send failed\n");
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req->errors++;
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nbd_end_request(req);
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} else {
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spin_lock(&lo->queue_lock);
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list_add(&req->queuelist, &lo->queue_head);
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spin_unlock(&lo->queue_lock);
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spin_lock(&nbd->queue_lock);
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list_add(&req->queuelist, &nbd->queue_head);
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spin_unlock(&nbd->queue_lock);
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}
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lo->active_req = NULL;
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mutex_unlock(&lo->tx_lock);
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wake_up_all(&lo->active_wq);
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nbd->active_req = NULL;
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mutex_unlock(&nbd->tx_lock);
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wake_up_all(&nbd->active_wq);
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return;
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@ -498,28 +499,28 @@ error_out:
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static int nbd_thread(void *data)
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{
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struct nbd_device *lo = data;
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struct nbd_device *nbd = data;
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struct request *req;
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set_user_nice(current, -20);
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while (!kthread_should_stop() || !list_empty(&lo->waiting_queue)) {
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while (!kthread_should_stop() || !list_empty(&nbd->waiting_queue)) {
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/* wait for something to do */
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wait_event_interruptible(lo->waiting_wq,
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wait_event_interruptible(nbd->waiting_wq,
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kthread_should_stop() ||
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!list_empty(&lo->waiting_queue));
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!list_empty(&nbd->waiting_queue));
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/* extract request */
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if (list_empty(&lo->waiting_queue))
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if (list_empty(&nbd->waiting_queue))
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continue;
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spin_lock_irq(&lo->queue_lock);
|
||||
req = list_entry(lo->waiting_queue.next, struct request,
|
||||
spin_lock_irq(&nbd->queue_lock);
|
||||
req = list_entry(nbd->waiting_queue.next, struct request,
|
||||
queuelist);
|
||||
list_del_init(&req->queuelist);
|
||||
spin_unlock_irq(&lo->queue_lock);
|
||||
spin_unlock_irq(&nbd->queue_lock);
|
||||
|
||||
/* handle request */
|
||||
nbd_handle_req(lo, req);
|
||||
nbd_handle_req(nbd, req);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
@ -527,7 +528,7 @@ static int nbd_thread(void *data)
|
||||
/*
|
||||
* We always wait for result of write, for now. It would be nice to make it optional
|
||||
* in future
|
||||
* if ((rq_data_dir(req) == WRITE) && (lo->flags & NBD_WRITE_NOCHK))
|
||||
* if ((rq_data_dir(req) == WRITE) && (nbd->flags & NBD_WRITE_NOCHK))
|
||||
* { printk( "Warning: Ignoring result!\n"); nbd_end_request( req ); }
|
||||
*/
|
||||
|
||||
@ -536,19 +537,19 @@ static void do_nbd_request(struct request_queue *q)
|
||||
struct request *req;
|
||||
|
||||
while ((req = blk_fetch_request(q)) != NULL) {
|
||||
struct nbd_device *lo;
|
||||
struct nbd_device *nbd;
|
||||
|
||||
spin_unlock_irq(q->queue_lock);
|
||||
|
||||
dprintk(DBG_BLKDEV, "%s: request %p: dequeued (flags=%x)\n",
|
||||
req->rq_disk->disk_name, req, req->cmd_type);
|
||||
|
||||
lo = req->rq_disk->private_data;
|
||||
nbd = req->rq_disk->private_data;
|
||||
|
||||
BUG_ON(lo->magic != LO_MAGIC);
|
||||
BUG_ON(nbd->magic != NBD_MAGIC);
|
||||
|
||||
if (unlikely(!lo->sock)) {
|
||||
dev_err(disk_to_dev(lo->disk),
|
||||
if (unlikely(!nbd->sock)) {
|
||||
dev_err(disk_to_dev(nbd->disk),
|
||||
"Attempted send on closed socket\n");
|
||||
req->errors++;
|
||||
nbd_end_request(req);
|
||||
@ -556,11 +557,11 @@ static void do_nbd_request(struct request_queue *q)
|
||||
continue;
|
||||
}
|
||||
|
||||
spin_lock_irq(&lo->queue_lock);
|
||||
list_add_tail(&req->queuelist, &lo->waiting_queue);
|
||||
spin_unlock_irq(&lo->queue_lock);
|
||||
spin_lock_irq(&nbd->queue_lock);
|
||||
list_add_tail(&req->queuelist, &nbd->waiting_queue);
|
||||
spin_unlock_irq(&nbd->queue_lock);
|
||||
|
||||
wake_up(&lo->waiting_wq);
|
||||
wake_up(&nbd->waiting_wq);
|
||||
|
||||
spin_lock_irq(q->queue_lock);
|
||||
}
|
||||
@ -568,32 +569,32 @@ static void do_nbd_request(struct request_queue *q)
|
||||
|
||||
/* Must be called with tx_lock held */
|
||||
|
||||
static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
|
||||
static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
switch (cmd) {
|
||||
case NBD_DISCONNECT: {
|
||||
struct request sreq;
|
||||
|
||||
dev_info(disk_to_dev(lo->disk), "NBD_DISCONNECT\n");
|
||||
dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n");
|
||||
|
||||
blk_rq_init(NULL, &sreq);
|
||||
sreq.cmd_type = REQ_TYPE_SPECIAL;
|
||||
nbd_cmd(&sreq) = NBD_CMD_DISC;
|
||||
if (!lo->sock)
|
||||
if (!nbd->sock)
|
||||
return -EINVAL;
|
||||
nbd_send_req(lo, &sreq);
|
||||
nbd_send_req(nbd, &sreq);
|
||||
return 0;
|
||||
}
|
||||
|
||||
case NBD_CLEAR_SOCK: {
|
||||
struct file *file;
|
||||
|
||||
lo->sock = NULL;
|
||||
file = lo->file;
|
||||
lo->file = NULL;
|
||||
nbd_clear_que(lo);
|
||||
BUG_ON(!list_empty(&lo->queue_head));
|
||||
nbd->sock = NULL;
|
||||
file = nbd->file;
|
||||
nbd->file = NULL;
|
||||
nbd_clear_que(nbd);
|
||||
BUG_ON(!list_empty(&nbd->queue_head));
|
||||
if (file)
|
||||
fput(file);
|
||||
return 0;
|
||||
@ -601,14 +602,14 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
|
||||
|
||||
case NBD_SET_SOCK: {
|
||||
struct file *file;
|
||||
if (lo->file)
|
||||
if (nbd->file)
|
||||
return -EBUSY;
|
||||
file = fget(arg);
|
||||
if (file) {
|
||||
struct inode *inode = file->f_path.dentry->d_inode;
|
||||
if (S_ISSOCK(inode->i_mode)) {
|
||||
lo->file = file;
|
||||
lo->sock = SOCKET_I(inode);
|
||||
nbd->file = file;
|
||||
nbd->sock = SOCKET_I(inode);
|
||||
if (max_part > 0)
|
||||
bdev->bd_invalidated = 1;
|
||||
return 0;
|
||||
@ -620,29 +621,29 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
|
||||
}
|
||||
|
||||
case NBD_SET_BLKSIZE:
|
||||
lo->blksize = arg;
|
||||
lo->bytesize &= ~(lo->blksize-1);
|
||||
bdev->bd_inode->i_size = lo->bytesize;
|
||||
set_blocksize(bdev, lo->blksize);
|
||||
set_capacity(lo->disk, lo->bytesize >> 9);
|
||||
nbd->blksize = arg;
|
||||
nbd->bytesize &= ~(nbd->blksize-1);
|
||||
bdev->bd_inode->i_size = nbd->bytesize;
|
||||
set_blocksize(bdev, nbd->blksize);
|
||||
set_capacity(nbd->disk, nbd->bytesize >> 9);
|
||||
return 0;
|
||||
|
||||
case NBD_SET_SIZE:
|
||||
lo->bytesize = arg & ~(lo->blksize-1);
|
||||
bdev->bd_inode->i_size = lo->bytesize;
|
||||
set_blocksize(bdev, lo->blksize);
|
||||
set_capacity(lo->disk, lo->bytesize >> 9);
|
||||
nbd->bytesize = arg & ~(nbd->blksize-1);
|
||||
bdev->bd_inode->i_size = nbd->bytesize;
|
||||
set_blocksize(bdev, nbd->blksize);
|
||||
set_capacity(nbd->disk, nbd->bytesize >> 9);
|
||||
return 0;
|
||||
|
||||
case NBD_SET_TIMEOUT:
|
||||
lo->xmit_timeout = arg * HZ;
|
||||
nbd->xmit_timeout = arg * HZ;
|
||||
return 0;
|
||||
|
||||
case NBD_SET_SIZE_BLOCKS:
|
||||
lo->bytesize = ((u64) arg) * lo->blksize;
|
||||
bdev->bd_inode->i_size = lo->bytesize;
|
||||
set_blocksize(bdev, lo->blksize);
|
||||
set_capacity(lo->disk, lo->bytesize >> 9);
|
||||
nbd->bytesize = ((u64) arg) * nbd->blksize;
|
||||
bdev->bd_inode->i_size = nbd->bytesize;
|
||||
set_blocksize(bdev, nbd->blksize);
|
||||
set_capacity(nbd->disk, nbd->bytesize >> 9);
|
||||
return 0;
|
||||
|
||||
case NBD_DO_IT: {
|
||||
@ -650,38 +651,38 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
|
||||
struct file *file;
|
||||
int error;
|
||||
|
||||
if (lo->pid)
|
||||
if (nbd->pid)
|
||||
return -EBUSY;
|
||||
if (!lo->file)
|
||||
if (!nbd->file)
|
||||
return -EINVAL;
|
||||
|
||||
mutex_unlock(&lo->tx_lock);
|
||||
mutex_unlock(&nbd->tx_lock);
|
||||
|
||||
thread = kthread_create(nbd_thread, lo, lo->disk->disk_name);
|
||||
thread = kthread_create(nbd_thread, nbd, nbd->disk->disk_name);
|
||||
if (IS_ERR(thread)) {
|
||||
mutex_lock(&lo->tx_lock);
|
||||
mutex_lock(&nbd->tx_lock);
|
||||
return PTR_ERR(thread);
|
||||
}
|
||||
wake_up_process(thread);
|
||||
error = nbd_do_it(lo);
|
||||
error = nbd_do_it(nbd);
|
||||
kthread_stop(thread);
|
||||
|
||||
mutex_lock(&lo->tx_lock);
|
||||
mutex_lock(&nbd->tx_lock);
|
||||
if (error)
|
||||
return error;
|
||||
sock_shutdown(lo, 0);
|
||||
file = lo->file;
|
||||
lo->file = NULL;
|
||||
nbd_clear_que(lo);
|
||||
dev_warn(disk_to_dev(lo->disk), "queue cleared\n");
|
||||
sock_shutdown(nbd, 0);
|
||||
file = nbd->file;
|
||||
nbd->file = NULL;
|
||||
nbd_clear_que(nbd);
|
||||
dev_warn(disk_to_dev(nbd->disk), "queue cleared\n");
|
||||
if (file)
|
||||
fput(file);
|
||||
lo->bytesize = 0;
|
||||
nbd->bytesize = 0;
|
||||
bdev->bd_inode->i_size = 0;
|
||||
set_capacity(lo->disk, 0);
|
||||
set_capacity(nbd->disk, 0);
|
||||
if (max_part > 0)
|
||||
ioctl_by_bdev(bdev, BLKRRPART, 0);
|
||||
return lo->harderror;
|
||||
return nbd->harderror;
|
||||
}
|
||||
|
||||
case NBD_CLEAR_QUE:
|
||||
@ -689,14 +690,14 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
|
||||
* This is for compatibility only. The queue is always cleared
|
||||
* by NBD_DO_IT or NBD_CLEAR_SOCK.
|
||||
*/
|
||||
BUG_ON(!lo->sock && !list_empty(&lo->queue_head));
|
||||
BUG_ON(!nbd->sock && !list_empty(&nbd->queue_head));
|
||||
return 0;
|
||||
|
||||
case NBD_PRINT_DEBUG:
|
||||
dev_info(disk_to_dev(lo->disk),
|
||||
dev_info(disk_to_dev(nbd->disk),
|
||||
"next = %p, prev = %p, head = %p\n",
|
||||
lo->queue_head.next, lo->queue_head.prev,
|
||||
&lo->queue_head);
|
||||
nbd->queue_head.next, nbd->queue_head.prev,
|
||||
&nbd->queue_head);
|
||||
return 0;
|
||||
}
|
||||
return -ENOTTY;
|
||||
@ -705,21 +706,21 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
|
||||
static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct nbd_device *lo = bdev->bd_disk->private_data;
|
||||
struct nbd_device *nbd = bdev->bd_disk->private_data;
|
||||
int error;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
|
||||
BUG_ON(lo->magic != LO_MAGIC);
|
||||
BUG_ON(nbd->magic != NBD_MAGIC);
|
||||
|
||||
/* Anyone capable of this syscall can do *real bad* things */
|
||||
dprintk(DBG_IOCTL, "%s: nbd_ioctl cmd=%s(0x%x) arg=%lu\n",
|
||||
lo->disk->disk_name, ioctl_cmd_to_ascii(cmd), cmd, arg);
|
||||
nbd->disk->disk_name, ioctl_cmd_to_ascii(cmd), cmd, arg);
|
||||
|
||||
mutex_lock(&lo->tx_lock);
|
||||
error = __nbd_ioctl(bdev, lo, cmd, arg);
|
||||
mutex_unlock(&lo->tx_lock);
|
||||
mutex_lock(&nbd->tx_lock);
|
||||
error = __nbd_ioctl(bdev, nbd, cmd, arg);
|
||||
mutex_unlock(&nbd->tx_lock);
|
||||
|
||||
return error;
|
||||
}
|
||||
@ -805,7 +806,7 @@ static int __init nbd_init(void)
|
||||
for (i = 0; i < nbds_max; i++) {
|
||||
struct gendisk *disk = nbd_dev[i].disk;
|
||||
nbd_dev[i].file = NULL;
|
||||
nbd_dev[i].magic = LO_MAGIC;
|
||||
nbd_dev[i].magic = NBD_MAGIC;
|
||||
nbd_dev[i].flags = 0;
|
||||
INIT_LIST_HEAD(&nbd_dev[i].waiting_queue);
|
||||
spin_lock_init(&nbd_dev[i].queue_lock);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user