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>
41 struct pnfs_block_dev {
42 struct list_head bm_node;
43 struct nfs4_deviceid bm_mdevid; /* associated devid */
44 struct block_device *bm_mdev; /* meta device itself */
48 PNFS_BLOCK_READWRITE_DATA = 0,
49 PNFS_BLOCK_READ_DATA = 1,
50 PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */
51 PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */
54 struct pnfs_inval_markings {
58 /* sector_t fields are all in 512-byte sectors */
59 struct pnfs_block_extent {
60 struct kref be_refcnt;
61 struct list_head be_node; /* link into lseg list */
62 struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */
63 struct block_device *be_mdev;
64 sector_t be_f_offset; /* the starting offset in the file */
65 sector_t be_length; /* the size of the extent */
66 sector_t be_v_offset; /* the starting offset in the volume */
67 enum exstate4 be_state; /* the state of this extent */
68 struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */
72 BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
78 RW_EXTENT = 0, /* READWRTE and INVAL */
79 RO_EXTENT = 1, /* READ and NONE */
83 struct pnfs_block_layout {
84 struct pnfs_layout_hdr bl_layout;
85 struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */
86 spinlock_t bl_ext_lock; /* Protects list manipulation */
87 struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */
88 struct list_head bl_commit; /* Needs layout commit */
89 struct list_head bl_committing; /* Layout committing */
90 unsigned int bl_count; /* entries in bl_commit */
91 sector_t bl_blocksize; /* Server blocksize in sectors */
94 static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
96 return container_of(lo, struct pnfs_block_layout, bl_layout);
101 uint32_t major, minor;
106 u16 totallen; /* length of entire message, including hdr itself */
109 extern struct dentry *bl_device_pipe;
110 extern wait_queue_head_t bl_wq;
112 #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */
113 #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/
114 #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */
115 #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */
116 #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */
118 /* blocklayoutdev.c */
119 ssize_t bl_pipe_upcall(struct file *, struct rpc_pipe_msg *,
120 char __user *, size_t);
121 ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t);
122 void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
123 struct block_device *nfs4_blkdev_get(dev_t dev);
124 int nfs4_blkdev_put(struct block_device *bdev);
125 struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
126 struct pnfs_device *dev,
127 struct list_head *sdlist);
128 int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
129 struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
131 void bl_put_extent(struct pnfs_block_extent *be);
132 #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */