| /* |
| * 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; |
| |
| #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 { |
| 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; |
| |
| 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; |
| }; |
| |
| 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 bl_cleanup_pipefs(void); |
| |
| #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |