forked from Minki/linux
9e69296999
Adds structures and basic create/delete code for extents. Signed-off-by: Fred Isaman <iisaman@citi.umich.edu> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Zhang Jingwang <Jingwang.Zhang@emc.com> Signed-off-by: Benny Halevy <bhalevy@tonian.com> Signed-off-by: Jim Rees <rees@umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*
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* linux/fs/nfs/blocklayout/blocklayout.h
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*
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* Module for the NFSv4.1 pNFS block layout driver.
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*
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* Copyright (c) 2006 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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* Fred Isaman <iisaman@umich.edu>
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*
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* permission is granted to use, copy, create derivative works and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the university of michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. if
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* the above copyright notice or any other identification of the
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* university of michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the
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* university of michigan as to its fitness for any purpose, and without
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* warranty by the university of michigan of any kind, either express
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* or implied, including without limitation the implied warranties of
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* merchantability and fitness for a particular purpose. the regents
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* of the university of michigan shall not be liable for any damages,
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* including special, indirect, incidental, or consequential damages,
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* with respect to any claim arising out or in connection with the use
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* of the software, even if it has been or is hereafter advised of the
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* possibility of such damages.
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*/
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#ifndef FS_NFS_NFS4BLOCKLAYOUT_H
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#define FS_NFS_NFS4BLOCKLAYOUT_H
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#include <linux/device-mapper.h>
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#include <linux/nfs_fs.h>
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#include "../pnfs.h"
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enum exstate4 {
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PNFS_BLOCK_READWRITE_DATA = 0,
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PNFS_BLOCK_READ_DATA = 1,
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PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */
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PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */
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};
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struct pnfs_inval_markings {
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/* STUB */
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};
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/* sector_t fields are all in 512-byte sectors */
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struct pnfs_block_extent {
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struct kref be_refcnt;
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struct list_head be_node; /* link into lseg list */
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struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */
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struct block_device *be_mdev;
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sector_t be_f_offset; /* the starting offset in the file */
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sector_t be_length; /* the size of the extent */
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sector_t be_v_offset; /* the starting offset in the volume */
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enum exstate4 be_state; /* the state of this extent */
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struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */
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};
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static inline void
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BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
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{
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/* STUB */
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}
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enum extentclass4 {
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RW_EXTENT = 0, /* READWRTE and INVAL */
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RO_EXTENT = 1, /* READ and NONE */
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EXTENT_LISTS = 2,
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};
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struct pnfs_block_layout {
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struct pnfs_layout_hdr bl_layout;
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struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */
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spinlock_t bl_ext_lock; /* Protects list manipulation */
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struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */
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struct list_head bl_commit; /* Needs layout commit */
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struct list_head bl_committing; /* Layout committing */
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unsigned int bl_count; /* entries in bl_commit */
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sector_t bl_blocksize; /* Server blocksize in sectors */
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};
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static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
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{
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return container_of(lo, struct pnfs_block_layout, bl_layout);
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}
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void bl_put_extent(struct pnfs_block_extent *be);
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#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
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