/*
|
* linux/fs/nfs/blocklayout/blocklayout.h
|
*
|
* Module for the NFSv4.1 pNFS block layout driver.
|
*
|
* Copyright (c) 2006 The Regents of the University of Michigan.
|
* All rights reserved.
|
*
|
* Andy Adamson <andros@citi.umich.edu>
|
* Fred Isaman <iisaman@umich.edu>
|
*
|
* permission is granted to use, copy, create derivative works and
|
* redistribute this software and such derivative works for any purpose,
|
* so long as the name of the university of michigan is not used in
|
* any advertising or publicity pertaining to the use or distribution
|
* of this software without specific, written prior authorization. if
|
* the above copyright notice or any other identification of the
|
* university of michigan is included in any copy of any portion of
|
* this software, then the disclaimer below must also be included.
|
*
|
* this software is provided as is, without representation from the
|
* university of michigan as to its fitness for any purpose, and without
|
* warranty by the university of michigan of any kind, either express
|
* or implied, including without limitation the implied warranties of
|
* merchantability and fitness for a particular purpose. the regents
|
* of the university of michigan shall not be liable for any damages,
|
* including special, indirect, incidental, or consequential damages,
|
* with respect to any claim arising out or in connection with the use
|
* of the software, even if it has been or is hereafter advised of the
|
* possibility of such damages.
|
*/
|
#ifndef FS_NFS_NFS4BLOCKLAYOUT_H
|
#define FS_NFS_NFS4BLOCKLAYOUT_H
|
|
#include <linux/device-mapper.h>
|
#include <linux/nfs_fs.h>
|
#include <linux/sunrpc/rpc_pipe_fs.h>
|
|
#include "../nfs4_fs.h"
|
#include "../pnfs.h"
|
#include "../netns.h"
|
|
#define PAGE_CACHE_SECTORS (PAGE_SIZE >> SECTOR_SHIFT)
|
#define PAGE_CACHE_SECTOR_SHIFT (PAGE_SHIFT - SECTOR_SHIFT)
|
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
|
|
struct pnfs_block_dev;
|
|
#define PNFS_BLOCK_MAX_UUIDS 4
|
#define PNFS_BLOCK_MAX_DEVICES 64
|
|
/*
|
* Random upper cap for the uuid length to avoid unbounded allocation.
|
* Not actually limited by the protocol.
|
*/
|
#define PNFS_BLOCK_UUID_LEN 128
|
|
struct pnfs_block_volume {
|
enum pnfs_block_volume_type type;
|
union {
|
struct {
|
int len;
|
int nr_sigs;
|
struct {
|
u64 offset;
|
u32 sig_len;
|
u8 sig[PNFS_BLOCK_UUID_LEN];
|
} sigs[PNFS_BLOCK_MAX_UUIDS];
|
} simple;
|
struct {
|
u64 start;
|
u64 len;
|
u32 volume;
|
} slice;
|
struct {
|
u32 volumes_count;
|
u32 volumes[PNFS_BLOCK_MAX_DEVICES];
|
} concat;
|
struct {
|
u64 chunk_size;
|
u32 volumes_count;
|
u32 volumes[PNFS_BLOCK_MAX_DEVICES];
|
} stripe;
|
struct {
|
enum scsi_code_set code_set;
|
enum scsi_designator_type designator_type;
|
int designator_len;
|
u8 designator[256];
|
u64 pr_key;
|
} scsi;
|
};
|
};
|
|
struct pnfs_block_dev_map {
|
u64 start;
|
u64 len;
|
u64 disk_offset;
|
struct block_device *bdev;
|
};
|
|
struct pnfs_block_dev {
|
struct nfs4_deviceid_node node;
|
|
u64 start;
|
u64 len;
|
|
u32 nr_children;
|
struct pnfs_block_dev *children;
|
u64 chunk_size;
|
|
struct block_device *bdev;
|
u64 disk_offset;
|
|
u64 pr_key;
|
bool pr_registered;
|
|
bool (*map)(struct pnfs_block_dev *dev, u64 offset,
|
struct pnfs_block_dev_map *map);
|
};
|
|
/* sector_t fields are all in 512-byte sectors */
|
struct pnfs_block_extent {
|
union {
|
struct rb_node be_node;
|
struct list_head be_list;
|
};
|
struct nfs4_deviceid_node *be_device;
|
sector_t be_f_offset; /* the starting offset in the file */
|
sector_t be_length; /* the size of the extent */
|
sector_t be_v_offset; /* the starting offset in the volume */
|
enum pnfs_block_extent_state be_state; /* the state of this extent */
|
#define EXTENT_WRITTEN 1
|
#define EXTENT_COMMITTING 2
|
unsigned int be_tag;
|
};
|
|
struct pnfs_block_layout {
|
struct pnfs_layout_hdr bl_layout;
|
struct rb_root bl_ext_rw;
|
struct rb_root bl_ext_ro;
|
spinlock_t bl_ext_lock; /* Protects list manipulation */
|
bool bl_scsi_layout;
|
u64 bl_lwb;
|
};
|
|
static inline struct pnfs_block_layout *
|
BLK_LO2EXT(struct pnfs_layout_hdr *lo)
|
{
|
return container_of(lo, struct pnfs_block_layout, bl_layout);
|
}
|
|
static inline struct pnfs_block_layout *
|
BLK_LSEG2EXT(struct pnfs_layout_segment *lseg)
|
{
|
return BLK_LO2EXT(lseg->pls_layout);
|
}
|
|
struct bl_pipe_msg {
|
struct rpc_pipe_msg msg;
|
wait_queue_head_t *bl_wq;
|
};
|
|
struct bl_msg_hdr {
|
u8 type;
|
u16 totallen; /* length of entire message, including hdr itself */
|
};
|
|
#define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */
|
#define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/
|
#define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */
|
#define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */
|
#define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */
|
|
/* dev.c */
|
struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server,
|
struct pnfs_device *pdev, gfp_t gfp_mask);
|
void bl_free_deviceid_node(struct nfs4_deviceid_node *d);
|
|
/* extent_tree.c */
|
int ext_tree_insert(struct pnfs_block_layout *bl,
|
struct pnfs_block_extent *new);
|
int ext_tree_remove(struct pnfs_block_layout *bl, bool rw, sector_t start,
|
sector_t end);
|
int ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
|
sector_t len, u64 lwb);
|
bool ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect,
|
struct pnfs_block_extent *ret, bool rw);
|
int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg);
|
void ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status);
|
|
/* rpc_pipefs.c */
|
dev_t bl_resolve_deviceid(struct nfs_server *server,
|
struct pnfs_block_volume *b, gfp_t gfp_mask);
|
int __init bl_init_pipefs(void);
|
void bl_cleanup_pipefs(void);
|
|
#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
|
