litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

diff options

Diffstat (limited to 'arch/x86/mm/init.c')

-rw-r--r--

1 files changed, 1 insertions, 1 deletions


diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index af5c1ed21d43..a22c2b95e513 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c
@@ -671,7 +671,7 @@ void __init init_mem_mapping(void)
671	load_cr3(swapper_pg_dir);	671	load_cr3(swapper_pg_dir);
672	__flush_tlb_all();	672	__flush_tlb_all();
673		673
674	hypervisor_init_mem_mapping();	674	x86_init.hyper.init_mem_mapping();
675		675
676	early_memtest(0, max_pfn_mapped << PAGE_SHIFT);	676	early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
677	}	677	}

/* * 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 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/fs.h> #include <linux/bio.h> #include <linux/stat.h> #include <linux/errno.h> #include <linux/file.h> #include <linux/ioctl.h> #include <linux/compiler.h> #include <linux/err.h> #include <linux/kernel.h> #include <net/sock.h> #include <linux/devfs_fs_kernel.h> #include <asm/uaccess.h> #include <asm/system.h> #include <asm/types.h> #include <linux/nbd.h> #define LO_MAGIC 0x68797548 #ifdef NDEBUG #define dprintk(flags, fmt...) #else /* NDEBUG */ #define dprintk(flags, fmt...) do { \ if (debugflags & (flags)) printk(KERN_DEBUG fmt); \ } while (0) #define DBG_IOCTL 0x0004 #define DBG_INIT 0x0010 #define DBG_EXIT 0x0020 #define DBG_BLKDEV 0x0100 #define DBG_RX 0x0200 #define DBG_TX 0x0400 static unsigned int debugflags; static unsigned int nbds_max = 16; #endif /* NDEBUG */ static struct nbd_device nbd_dev[MAX_NBD]; /* * Use just one lock (or at most 1 per NIC). Two arguments for this: * 1. Each NIC is essentially a synchronization point for all servers * accessed through that NIC so there's no need to have more locks * than NICs anyway. * 2. More locks lead to more "Dirty cache line bouncing" which will slow * down each lock to the point where they're actually slower than just * a single lock. * Thanks go to Jens Axboe and Al Viro for their LKML emails explaining this! */ static DEFINE_SPINLOCK(nbd_lock); #ifndef NDEBUG static const char *ioctl_cmd_to_ascii(int cmd) { switch (cmd) { case NBD_SET_SOCK: return "set-sock"; case NBD_SET_BLKSIZE: return "set-blksize"; case NBD_SET_SIZE: return "set-size"; case NBD_DO_IT: return "do-it"; case NBD_CLEAR_SOCK: return "clear-sock"; case NBD_CLEAR_QUE: return "clear-que"; case NBD_PRINT_DEBUG: return "print-debug"; case NBD_SET_SIZE_BLOCKS: return "set-size-blocks"; case NBD_DISCONNECT: return "disconnect"; case BLKROSET: return "set-read-only"; case BLKFLSBUF: return "flush-buffer-cache"; } return "unknown"; } 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"; } return "invalid"; } #endif /* NDEBUG */ static void nbd_end_request(struct request *req) { int uptodate = (req->errors == 0) ? 1 : 0; request_queue_t *q = req->q; unsigned long flags; dprintk(DBG_BLKDEV, "%s: request %p: %s\n", req->rq_disk->disk_name, req, uptodate? "done": "failed"); spin_lock_irqsave(q->queue_lock, flags); if (!end_that_request_first(req, uptodate, req->nr_sectors)) { end_that_request_last(req, uptodate); } spin_unlock_irqrestore(q->queue_lock, flags); } /* * Send or receive packet. */ static int sock_xmit(struct socket *sock, int send, void *buf, int size, int msg_flags) { int result; struct msghdr msg; struct kvec iov; unsigned long flags; sigset_t oldset; /* Allow interception of SIGKILL only * Don't allow other signals to interrupt the transmission */ spin_lock_irqsave(&current->sighand->siglock, flags); oldset = current->blocked; sigfillset(&current->blocked); sigdelsetmask(&current->blocked, sigmask(SIGKILL)); recalc_sigpending(); spin_unlock_irqrestore(&current->sighand->siglock, flags); do { sock->sk->sk_allocation = GFP_NOIO; iov.iov_base = buf; iov.iov_len = size; 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 = kernel_sendmsg(sock, &msg, &iov, 1, size); else result = kernel_recvmsg(sock, &msg, &iov, 1, size, 0); if (signal_pending(current)) { siginfo_t info; spin_lock_irqsave(&current->sighand->siglock, flags); printk(KERN_WARNING "nbd (pid %d: %s) got signal %d\n", current->pid, current->comm, dequeue_signal(current, &current->blocked, &info)); spin_unlock_irqrestore(&current->sighand->siglock, flags); result = -EINTR; break; } if (result <= 0) { if (result == 0) result = -EPIPE; /* short read */ break; } size -= result; buf += result; } while (size > 0); spin_lock_irqsave(&current->sighand->siglock, flags); current->blocked = oldset; recalc_sigpending(); spin_unlock_irqrestore(&current->sighand->siglock, flags); return result; } static inline int sock_send_bvec(struct socket *sock, struct bio_vec *bvec, int flags) { int result; void *kaddr = kmap(bvec->bv_page); result = sock_xmit(sock, 1, kaddr + bvec->bv_offset, bvec->bv_len, flags); kunmap(bvec->bv_page); return result; } static int nbd_send_req(struct nbd_device *lo, struct request *req) { int result, i, flags; struct nbd_request request; unsigned long size = req->nr_sectors << 9; struct socket *sock = lo->sock; request.magic = htonl(NBD_REQUEST_MAGIC); request.type = htonl(nbd_cmd(req)); request.from = cpu_to_be64((u64) req->sector << 9); request.len = htonl(size); memcpy(request.handle, &req, sizeof(req)); dprintk(DBG_TX, "%s: request %p: sending control (%s@%llu,%luB)\n", lo->disk->disk_name, req, nbdcmd_to_ascii(nbd_cmd(req)), (unsigned long long)req->sector << 9, req->nr_sectors << 9); result = sock_xmit(sock, 1, &request, sizeof(request), (nbd_cmd(req) == NBD_CMD_WRITE)? MSG_MORE: 0); if (result <= 0) { printk(KERN_ERR "%s: Send control failed (result %d)\n", lo->disk->disk_name, result); goto error_out; } if (nbd_cmd(req) == NBD_CMD_WRITE) { struct bio *bio; /* * we are really probing at internals to determine * whether to set MSG_MORE or not... */ rq_for_each_bio(bio, req) { struct bio_vec *bvec; bio_for_each_segment(bvec, bio, i) { flags = 0; if ((i < (bio->bi_vcnt - 1)) || bio->bi_next) flags = MSG_MORE; dprintk(DBG_TX, "%s: request %p: sending %d bytes data\n", lo->disk->disk_name, req, bvec->bv_len); result = sock_send_bvec(sock, bvec, flags); if (result <= 0) { printk(KERN_ERR "%s: Send data failed (result %d)\n", lo->disk->disk_name, result); goto error_out; } } } } return 0; error_out: return 1; } static struct request *nbd_find_request(struct nbd_device *lo, char *handle) { struct request *req; struct list_head *tmp; struct request *xreq; int err; memcpy(&xreq, handle, sizeof(xreq)); err = wait_event_interruptible(lo->active_wq, lo->active_req != xreq); if (unlikely(err)) goto out; spin_lock(&lo->queue_lock); list_for_each(tmp, &lo->queue_head) { req = list_entry(tmp, struct request, queuelist); if (req != xreq) continue; list_del_init(&req->queuelist); spin_unlock(&lo->queue_lock); return req; } spin_unlock(&lo->queue_lock); err = -ENOENT; out: return ERR_PTR(err); } static inline int sock_recv_bvec(struct socket *sock, struct bio_vec *bvec) { int result; void *kaddr = kmap(bvec->bv_page); result = sock_xmit(sock, 0, kaddr + bvec->bv_offset, bvec->bv_len, MSG_WAITALL); kunmap(bvec->bv_page); return result; } /* NULL returned = something went wrong, inform userspace */ static struct request *nbd_read_stat(struct nbd_device *lo) { int result; struct nbd_reply reply; struct request *req; struct socket *sock = lo->sock; reply.magic = 0; result = sock_xmit(sock, 0, &reply, sizeof(reply), MSG_WAITALL); if (result <= 0) { printk(KERN_ERR "%s: Receive control failed (result %d)\n", lo->disk->disk_name, result); goto harderror; } req = nbd_find_request(lo, reply.handle); if (unlikely(IS_ERR(req))) { result = PTR_ERR(req); if (result != -ENOENT) goto harderror; printk(KERN_ERR "%s: Unexpected reply (%p)\n", lo->disk->disk_name, reply.handle); result = -EBADR; goto harderror; } if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { printk(KERN_ERR "%s: Wrong magic (0x%lx)\n", lo->disk->disk_name, (unsigned long)ntohl(reply.magic)); result = -EPROTO; goto harderror; } if (ntohl(reply.error)) { printk(KERN_ERR "%s: Other side returned error (%d)\n", lo->disk->disk_name, ntohl(reply.error)); req->errors++; return req; } dprintk(DBG_RX, "%s: request %p: got reply\n", lo->disk->disk_name, req); if (nbd_cmd(req) == NBD_CMD_READ) { int i; struct bio *bio; rq_for_each_bio(bio, req) { struct bio_vec *bvec; bio_for_each_segment(bvec, bio, i) { result = sock_recv_bvec(sock, bvec); if (result <= 0) { printk(KERN_ERR "%s: Receive data failed (result %d)\n", lo->disk->disk_name, result); goto harderror; } dprintk(DBG_RX, "%s: request %p: got %d bytes data\n", lo->disk->disk_name, req, bvec->bv_len); } } } return req; harderror: lo->harderror = result; return NULL; } static void nbd_do_it(struct nbd_device *lo) { struct request *req; BUG_ON(lo->magic != LO_MAGIC); while ((req = nbd_read_stat(lo)) != NULL) nbd_end_request(req); return; } static void nbd_clear_que(struct nbd_device *lo) { struct request *req; BUG_ON(lo->magic != LO_MAGIC); /* * Because we have set lo->sock to NULL under the tx_lock, all * modifications to the list must have completed by now. For * the same reason, the active_req must be NULL. * * As a consequence, we don't need to take the spin lock while * purging the list here. */ BUG_ON(lo->sock); BUG_ON(lo->active_req); while (!list_empty(&lo->queue_head)) { req = list_entry(lo->queue_head.next, struct request, queuelist); list_del_init(&req->queuelist); req->errors++; nbd_end_request(req); } } /* * We always wait for result of write, for now. It would be nice to make it optional * in future * if ((req->cmd == WRITE) && (lo->flags & NBD_WRITE_NOCHK)) * { printk( "Warning: Ignoring result!\n"); nbd_end_request( req ); } */ static void do_nbd_request(request_queue_t * q) { struct request *req; while ((req = elv_next_request(q)) != NULL) { struct nbd_device *lo; blkdev_dequeue_request(req); dprintk(DBG_BLKDEV, "%s: request %p: dequeued (flags=%lx)\n", req->rq_disk->disk_name, req, req->flags); if (!(req->flags & REQ_CMD)) goto error_out; lo = req->rq_disk->private_data; BUG_ON(lo->magic != LO_MAGIC); nbd_cmd(req) = NBD_CMD_READ; if (rq_data_dir(req) == WRITE) { nbd_cmd(req) = NBD_CMD_WRITE; if (lo->flags & NBD_READ_ONLY) { printk(KERN_ERR "%s: Write on read-only\n", lo->disk->disk_name); goto error_out; } } req->errors = 0; spin_unlock_irq(q->queue_lock); mutex_lock(&lo->tx_lock); if (unlikely(!lo->sock)) { mutex_unlock(&lo->tx_lock); printk(KERN_ERR "%s: Attempted send on closed socket\n", lo->disk->disk_name); req->errors++; nbd_end_request(req); spin_lock_irq(q->queue_lock); continue; } lo->active_req = req; if (nbd_send_req(lo, req) != 0) { printk(KERN_ERR "%s: Request send failed\n", lo->disk->disk_name); req->errors++; nbd_end_request(req); } else { spin_lock(&lo->queue_lock); list_add(&req->queuelist, &lo->queue_head); spin_unlock(&lo->queue_lock); } lo->active_req = NULL; mutex_unlock(&lo->tx_lock); wake_up_all(&lo->active_wq); spin_lock_irq(q->queue_lock); continue; error_out: req->errors++; spin_unlock(q->queue_lock); nbd_end_request(req); spin_lock(q->queue_lock); } return; } static int nbd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct nbd_device *lo = inode->i_bdev->bd_disk->private_data; int error; struct request sreq ; if (!capable(CAP_SYS_ADMIN)) return -EPERM; BUG_ON(lo->magic != LO_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); switch (cmd) { case NBD_DISCONNECT: printk(KERN_INFO "%s: NBD_DISCONNECT\n", lo->disk->disk_name); sreq.flags = REQ_SPECIAL; nbd_cmd(&sreq) = NBD_CMD_DISC; /* * Set these to sane values in case server implementation * fails to check the request type first and also to keep * debugging output cleaner. */ sreq.sector = 0; sreq.nr_sectors = 0; if (!lo->sock) return -EINVAL; nbd_send_req(lo, &sreq); return 0; case NBD_CLEAR_SOCK: error = 0; mutex_lock(&lo->tx_lock); lo->sock = NULL; mutex_unlock(&lo->tx_lock); file = lo->file; lo->file = NULL; nbd_clear_que(lo); BUG_ON(!list_empty(&lo->queue_head)); if (file) fput(file); return error; case NBD_SET_SOCK: if (lo->file) return -EBUSY; error = -EINVAL; file = fget(arg); if (file) { inode = file->f_dentry->d_inode; if (S_ISSOCK(inode->i_mode)) { lo->file = file; lo->sock = SOCKET_I(inode); error = 0; } else { fput(file); } } return error; case NBD_SET_BLKSIZE: lo->blksize = arg; lo->bytesize &= ~(lo->blksize-1); inode->i_bdev->bd_inode->i_size = lo->bytesize; set_blocksize(inode->i_bdev, lo->blksize); set_capacity(lo->disk, lo->bytesize >> 9); return 0; case NBD_SET_SIZE: lo->bytesize = arg & ~(lo->blksize-1); inode->i_bdev->bd_inode->i_size = lo->bytesize; set_blocksize(inode->i_bdev, lo->blksize); set_capacity(lo->disk, lo->bytesize >> 9); return 0; case NBD_SET_SIZE_BLOCKS: lo->bytesize = ((u64) arg) * lo->blksize; inode->i_bdev->bd_inode->i_size = lo->bytesize; set_blocksize(inode->i_bdev, lo->blksize); set_capacity(lo->disk, lo->bytesize >> 9); return 0; case NBD_DO_IT: if (!lo->file) return -EINVAL; nbd_do_it(lo); /* on return tidy up in case we have a signal */ /* Forcibly shutdown the socket causing all listeners * to error * * FIXME: This code is duplicated from sys_shutdown, but * there should be a more generic interface rather than * calling socket ops directly here */ mutex_lock(&lo->tx_lock); if (lo->sock) { printk(KERN_WARNING "%s: shutting down socket\n", lo->disk->disk_name); lo->sock->ops->shutdown(lo->sock, SEND_SHUTDOWN|RCV_SHUTDOWN); lo->sock = NULL; } mutex_unlock(&lo->tx_lock); file = lo->file; lo->file = NULL; nbd_clear_que(lo); printk(KERN_WARNING "%s: queue cleared\n", lo->disk->disk_name); if (file) fput(file); return lo->harderror; case NBD_CLEAR_QUE: /* * 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)); return 0; case NBD_PRINT_DEBUG: printk(KERN_INFO "%s: next = %p, prev = %p, head = %p\n", inode->i_bdev->bd_disk->disk_name, lo->queue_head.next, lo->queue_head.prev, &lo->queue_head); return 0; } return -EINVAL; } static struct block_device_operations nbd_fops = { .owner = THIS_MODULE, .ioctl = nbd_ioctl, }; /* * And here should be modules and kernel interface * (Just smiley confuses emacs :-) */ static int __init nbd_init(void) { int err = -ENOMEM; int i; BUILD_BUG_ON(sizeof(struct nbd_request) != 28); if (nbds_max > MAX_NBD) { printk(KERN_CRIT "nbd: cannot allocate more than %u nbds; %u requested.\n", MAX_NBD, nbds_max); return -EINVAL; } for (i = 0; i < nbds_max; i++) { struct gendisk *disk = alloc_disk(1); if (!disk) goto out; nbd_dev[i].disk = disk; /* * The new linux 2.5 block layer implementation requires * every gendisk to have its very own request_queue struct. * These structs are big so we dynamically allocate them. */ disk->queue = blk_init_queue(do_nbd_request, &nbd_lock); if (!disk->queue) { put_disk(disk); goto out; } } if (register_blkdev(NBD_MAJOR, "nbd")) { err = -EIO; goto out; } printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); dprintk(DBG_INIT, "nbd: debugflags=0x%x\n", debugflags); 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].flags = 0; spin_lock_init(&nbd_dev[i].queue_lock); INIT_LIST_HEAD(&nbd_dev[i].queue_head); mutex_init(&nbd_dev[i].tx_lock); init_waitqueue_head(&nbd_dev[i].active_wq); nbd_dev[i].blksize = 1024; nbd_dev[i].bytesize = 0x7ffffc00ULL << 10; /* 2TB */ disk->major = NBD_MAJOR; disk->first_minor = i; disk->fops = &nbd_fops; disk->private_data = &nbd_dev[i]; disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO; sprintf(disk->disk_name, "nbd%d", i);


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