diff options
author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
---|---|---|
committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /include/linux/nbd.h | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'include/linux/nbd.h')
-rw-r--r-- | include/linux/nbd.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/include/linux/nbd.h b/include/linux/nbd.h new file mode 100644 index 00000000..d146ca10 --- /dev/null +++ b/include/linux/nbd.h @@ -0,0 +1,102 @@ +/* + * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL. + * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne) + * Made nbd_end_request() use the io_request_lock + * 2001 Copyright (C) Steven Whitehouse + * New nbd_end_request() for compatibility with new linux block + * layer code. + * 2003/06/24 Louis D. Langholtz <ldl@aros.net> + * Removed unneeded blksize_bits field from nbd_device struct. + * Cleanup PARANOIA usage & code. + * 2004/02/19 Paul Clements + * Removed PARANOIA, plus various cleanup and comments + */ + +#ifndef LINUX_NBD_H +#define LINUX_NBD_H + +#include <linux/types.h> + +#define NBD_SET_SOCK _IO( 0xab, 0 ) +#define NBD_SET_BLKSIZE _IO( 0xab, 1 ) +#define NBD_SET_SIZE _IO( 0xab, 2 ) +#define NBD_DO_IT _IO( 0xab, 3 ) +#define NBD_CLEAR_SOCK _IO( 0xab, 4 ) +#define NBD_CLEAR_QUE _IO( 0xab, 5 ) +#define NBD_PRINT_DEBUG _IO( 0xab, 6 ) +#define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) +#define NBD_DISCONNECT _IO( 0xab, 8 ) +#define NBD_SET_TIMEOUT _IO( 0xab, 9 ) + +enum { + NBD_CMD_READ = 0, + NBD_CMD_WRITE = 1, + NBD_CMD_DISC = 2 +}; + +#define nbd_cmd(req) ((req)->cmd[0]) + +/* userspace doesn't need the nbd_device structure */ +#ifdef __KERNEL__ + +#include <linux/wait.h> +#include <linux/mutex.h> + +/* values for flags field */ +#define NBD_READ_ONLY 0x0001 +#define NBD_WRITE_NOCHK 0x0002 + +struct request; + +struct nbd_device { + int flags; + int harderror; /* Code of hard error */ + struct socket * sock; + struct file * file; /* If == NULL, device is not ready, yet */ + int magic; + + spinlock_t queue_lock; + struct list_head queue_head; /* Requests waiting result */ + struct request *active_req; + wait_queue_head_t active_wq; + struct list_head waiting_queue; /* Requests to be sent */ + wait_queue_head_t waiting_wq; + + struct mutex tx_lock; + struct gendisk *disk; + int blksize; + u64 bytesize; + pid_t pid; /* pid of nbd-client, if attached */ + int xmit_timeout; +}; + +#endif + +/* These are sent over the network in the request/reply magic fields */ + +#define NBD_REQUEST_MAGIC 0x25609513 +#define NBD_REPLY_MAGIC 0x67446698 +/* Do *not* use magics: 0x12560953 0x96744668. */ + +/* + * This is the packet used for communication between client and + * server. All data are in network byte order. + */ +struct nbd_request { + __be32 magic; + __be32 type; /* == READ || == WRITE */ + char handle[8]; + __be64 from; + __be32 len; +} __attribute__((packed)); + +/* + * This is the reply packet that nbd-server sends back to the client after + * it has completed an I/O request (or an error occurs). + */ +struct nbd_reply { + __be32 magic; + __be32 error; /* 0 = ok, else error */ + char handle[8]; /* handle you got from request */ +}; +#endif |