2 * linux/fs/nfs/blocklayout/blocklayout.h
4 * Module for the NFSv4.1 pNFS block layout driver.
6 * Copyright (c) 2006 The Regents of the University of Michigan.
9 * Andy Adamson <andros@citi.umich.edu>
10 * Fred Isaman <iisaman@umich.edu>
12 * permission is granted to use, copy, create derivative works and
13 * redistribute this software and such derivative works for any purpose,
14 * so long as the name of the university of michigan is not used in
15 * any advertising or publicity pertaining to the use or distribution
16 * of this software without specific, written prior authorization. if
17 * the above copyright notice or any other identification of the
18 * university of michigan is included in any copy of any portion of
19 * this software, then the disclaimer below must also be included.
21 * this software is provided as is, without representation from the
22 * university of michigan as to its fitness for any purpose, and without
23 * warranty by the university of michigan of any kind, either express
24 * or implied, including without limitation the implied warranties of
25 * merchantability and fitness for a particular purpose. the regents
26 * of the university of michigan shall not be liable for any damages,
27 * including special, indirect, incidental, or consequential damages,
28 * with respect to any claim arising out or in connection with the use
29 * of the software, even if it has been or is hereafter advised of the
30 * possibility of such damages.
32 #ifndef FS_NFS_NFS4BLOCKLAYOUT_H
33 #define FS_NFS_NFS4BLOCKLAYOUT_H
35 #include <linux/device-mapper.h>
36 #include <linux/nfs_fs.h>
37 #include <linux/sunrpc/rpc_pipe_fs.h>
39 #include "../nfs4_fs.h"
43 #define PAGE_CACHE_SECTORS (PAGE_CACHE_SIZE >> SECTOR_SHIFT)
44 #define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT)
45 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
47 struct block_mount_id {
48 spinlock_t bm_lock; /* protects list */
49 struct list_head bm_devlist; /* holds pnfs_block_dev */
52 struct pnfs_block_dev {
53 struct list_head bm_node;
54 struct nfs4_deviceid bm_mdevid; /* associated devid */
55 struct block_device *bm_mdev; /* meta device itself */
60 PNFS_BLOCK_READWRITE_DATA = 0,
61 PNFS_BLOCK_READ_DATA = 1,
62 PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */
63 PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */
66 /* sector_t fields are all in 512-byte sectors */
67 struct pnfs_block_extent {
69 struct rb_node be_node;
70 struct list_head be_list;
72 struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */
73 struct block_device *be_mdev;
74 sector_t be_f_offset; /* the starting offset in the file */
75 sector_t be_length; /* the size of the extent */
76 sector_t be_v_offset; /* the starting offset in the volume */
77 enum exstate4 be_state; /* the state of this extent */
78 #define EXTENT_WRITTEN 1
79 #define EXTENT_COMMITTING 2
83 struct pnfs_block_layout {
84 struct pnfs_layout_hdr bl_layout;
85 struct rb_root bl_ext_rw;
86 struct rb_root bl_ext_ro;
87 spinlock_t bl_ext_lock; /* Protects list manipulation */
90 #define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data))
92 static inline struct pnfs_block_layout *
93 BLK_LO2EXT(struct pnfs_layout_hdr *lo)
95 return container_of(lo, struct pnfs_block_layout, bl_layout);
98 static inline struct pnfs_block_layout *
99 BLK_LSEG2EXT(struct pnfs_layout_segment *lseg)
101 return BLK_LO2EXT(lseg->pls_layout);
105 struct rpc_pipe_msg msg;
106 wait_queue_head_t *bl_wq;
111 u16 totallen; /* length of entire message, including hdr itself */
114 #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */
115 #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/
116 #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */
117 #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */
118 #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */
120 /* blocklayoutdev.c */
121 ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t);
122 void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
123 void nfs4_blkdev_put(struct block_device *bdev);
124 struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
125 struct pnfs_device *dev);
126 int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
127 struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
129 /* blocklayoutdm.c */
130 void bl_free_block_dev(struct pnfs_block_dev *bdev);
133 int ext_tree_insert(struct pnfs_block_layout *bl,
134 struct pnfs_block_extent *new);
135 int ext_tree_remove(struct pnfs_block_layout *bl, bool rw, sector_t start,
137 int ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
139 bool ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect,
140 struct pnfs_block_extent *ret, bool rw);
141 int ext_tree_encode_commit(struct pnfs_block_layout *bl,
142 struct xdr_stream *xdr);
143 void ext_tree_mark_committed(struct pnfs_block_layout *bl, int status);
145 #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */