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![Benjamin Coddington](/assets/img/avatar_default.png)
Fixup the field types to match their use. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trondmy@gmail.com>
197 lines
5.6 KiB
C
197 lines
5.6 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 <linux/sunrpc/rpc_pipe_fs.h>
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#include "../nfs4_fs.h"
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#include "../pnfs.h"
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#include "../netns.h"
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#define PAGE_CACHE_SECTORS (PAGE_SIZE >> SECTOR_SHIFT)
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#define PAGE_CACHE_SECTOR_SHIFT (PAGE_SHIFT - SECTOR_SHIFT)
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#define SECTOR_SIZE (1 << SECTOR_SHIFT)
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struct pnfs_block_dev;
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#define PNFS_BLOCK_MAX_UUIDS 4
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#define PNFS_BLOCK_MAX_DEVICES 64
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/*
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* Random upper cap for the uuid length to avoid unbounded allocation.
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* Not actually limited by the protocol.
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*/
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#define PNFS_BLOCK_UUID_LEN 128
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struct pnfs_block_volume {
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enum pnfs_block_volume_type type;
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union {
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struct {
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int len;
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int nr_sigs;
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struct {
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u64 offset;
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u32 sig_len;
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u8 sig[PNFS_BLOCK_UUID_LEN];
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} sigs[PNFS_BLOCK_MAX_UUIDS];
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} simple;
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struct {
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u64 start;
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u64 len;
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u32 volume;
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} slice;
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struct {
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u32 volumes_count;
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u32 volumes[PNFS_BLOCK_MAX_DEVICES];
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} concat;
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struct {
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u64 chunk_size;
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u32 volumes_count;
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u32 volumes[PNFS_BLOCK_MAX_DEVICES];
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} stripe;
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struct {
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enum scsi_code_set code_set;
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enum scsi_designator_type designator_type;
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int designator_len;
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u8 designator[256];
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u64 pr_key;
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} scsi;
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};
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};
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struct pnfs_block_dev_map {
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u64 start;
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u64 len;
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u64 disk_offset;
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struct block_device *bdev;
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};
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struct pnfs_block_dev {
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struct nfs4_deviceid_node node;
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u64 start;
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u64 len;
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u32 nr_children;
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struct pnfs_block_dev *children;
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u64 chunk_size;
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struct block_device *bdev;
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u64 disk_offset;
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u64 pr_key;
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bool pr_registered;
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bool (*map)(struct pnfs_block_dev *dev, u64 offset,
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struct pnfs_block_dev_map *map);
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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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union {
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struct rb_node be_node;
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struct list_head be_list;
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};
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struct nfs4_deviceid_node *be_device;
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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 pnfs_block_extent_state be_state; /* the state of this extent */
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#define EXTENT_WRITTEN 1
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#define EXTENT_COMMITTING 2
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unsigned int be_tag;
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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 rb_root bl_ext_rw;
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struct rb_root bl_ext_ro;
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spinlock_t bl_ext_lock; /* Protects list manipulation */
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bool bl_scsi_layout;
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u64 bl_lwb;
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};
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static inline struct pnfs_block_layout *
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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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static inline struct pnfs_block_layout *
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BLK_LSEG2EXT(struct pnfs_layout_segment *lseg)
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{
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return BLK_LO2EXT(lseg->pls_layout);
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}
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struct bl_pipe_msg {
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struct rpc_pipe_msg msg;
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wait_queue_head_t *bl_wq;
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};
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struct bl_msg_hdr {
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u8 type;
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u16 totallen; /* length of entire message, including hdr itself */
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};
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#define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */
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#define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/
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#define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */
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#define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */
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#define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */
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/* dev.c */
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struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server,
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struct pnfs_device *pdev, gfp_t gfp_mask);
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void bl_free_deviceid_node(struct nfs4_deviceid_node *d);
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/* extent_tree.c */
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int ext_tree_insert(struct pnfs_block_layout *bl,
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struct pnfs_block_extent *new);
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int ext_tree_remove(struct pnfs_block_layout *bl, bool rw, sector_t start,
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sector_t end);
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int ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
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sector_t len, u64 lwb);
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bool ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect,
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struct pnfs_block_extent *ret, bool rw);
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int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg);
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void ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status);
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/* rpc_pipefs.c */
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dev_t bl_resolve_deviceid(struct nfs_server *server,
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struct pnfs_block_volume *b, gfp_t gfp_mask);
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int __init bl_init_pipefs(void);
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void bl_cleanup_pipefs(void);
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#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
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