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/*
* 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_CACHE_SIZE >> SECTOR_SHIFT)
#define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT)
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
struct pnfs_block_dev;
enum pnfs_block_volume_type {
PNFS_BLOCK_VOLUME_SIMPLE = 0,
PNFS_BLOCK_VOLUME_SLICE = 1,
PNFS_BLOCK_VOLUME_CONCAT = 2,
PNFS_BLOCK_VOLUME_STRIPE = 3,
};
#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 pnfs_block_dev_map {
sector_t start;
sector_t len;
sector_t 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;
bool (*map)(struct pnfs_block_dev *dev, u64 offset,
struct pnfs_block_dev_map *map);
};
enum exstate4 {
PNFS_BLOCK_READWRITE_DATA = 0,
PNFS_BLOCK_READ_DATA = 1,
PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */
PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */
};
/* 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 exstate4 be_state; /* the state of this extent */
#define EXTENT_WRITTEN 1
#define EXTENT_COMMITTING 2
unsigned int be_tag;
};
/* on the wire size of the extent */
#define BL_EXTENT_SIZE (7 * sizeof(__be32) + NFS4_DEVICEID4_SIZE)
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 */
};
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);
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 __exit bl_cleanup_pipefs(void);
#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
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