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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 "../pnfs.h"
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 */
};
struct pnfs_inval_markings {
/* STUB */
};
/* sector_t fields are all in 512-byte sectors */
struct pnfs_block_extent {
struct kref be_refcnt;
struct list_head be_node; /* link into lseg list */
struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */
struct block_device *be_mdev;
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 */
struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */
};
static inline void
BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
{
/* STUB */
}
enum extentclass4 {
RW_EXTENT = 0, /* READWRTE and INVAL */
RO_EXTENT = 1, /* READ and NONE */
EXTENT_LISTS = 2,
};
struct pnfs_block_layout {
struct pnfs_layout_hdr bl_layout;
struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */
spinlock_t bl_ext_lock; /* Protects list manipulation */
struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */
struct list_head bl_commit; /* Needs layout commit */
struct list_head bl_committing; /* Layout committing */
unsigned int bl_count; /* entries in bl_commit */
sector_t bl_blocksize; /* Server blocksize in sectors */
};
static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
{
return container_of(lo, struct pnfs_block_layout, bl_layout);
}
void bl_put_extent(struct pnfs_block_extent *be);
#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
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