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197 lines
5.6 KiB
197 lines
5.6 KiB
/* |
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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 <[email protected]> |
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* Fred Isaman <[email protected]> |
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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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