diff options
Diffstat (limited to 'fs/nfs/blocklayout/blocklayout.h')
-rw-r--r-- | fs/nfs/blocklayout/blocklayout.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h new file mode 100644 index 00000000000..8bfa4668ff3 --- /dev/null +++ b/fs/nfs/blocklayout/blocklayout.h | |||
@@ -0,0 +1,91 @@ | |||
1 | /* | ||
2 | * linux/fs/nfs/blocklayout/blocklayout.h | ||
3 | * | ||
4 | * Module for the NFSv4.1 pNFS block layout driver. | ||
5 | * | ||
6 | * Copyright (c) 2006 The Regents of the University of Michigan. | ||
7 | * All rights reserved. | ||
8 | * | ||
9 | * Andy Adamson <andros@citi.umich.edu> | ||
10 | * Fred Isaman <iisaman@umich.edu> | ||
11 | * | ||
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. | ||
20 | * | ||
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. | ||
31 | */ | ||
32 | #ifndef FS_NFS_NFS4BLOCKLAYOUT_H | ||
33 | #define FS_NFS_NFS4BLOCKLAYOUT_H | ||
34 | |||
35 | #include <linux/device-mapper.h> | ||
36 | #include <linux/nfs_fs.h> | ||
37 | #include "../pnfs.h" | ||
38 | |||
39 | enum exstate4 { | ||
40 | PNFS_BLOCK_READWRITE_DATA = 0, | ||
41 | PNFS_BLOCK_READ_DATA = 1, | ||
42 | PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */ | ||
43 | PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */ | ||
44 | }; | ||
45 | |||
46 | struct pnfs_inval_markings { | ||
47 | /* STUB */ | ||
48 | }; | ||
49 | |||
50 | /* sector_t fields are all in 512-byte sectors */ | ||
51 | struct pnfs_block_extent { | ||
52 | struct kref be_refcnt; | ||
53 | struct list_head be_node; /* link into lseg list */ | ||
54 | struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */ | ||
55 | struct block_device *be_mdev; | ||
56 | sector_t be_f_offset; /* the starting offset in the file */ | ||
57 | sector_t be_length; /* the size of the extent */ | ||
58 | sector_t be_v_offset; /* the starting offset in the volume */ | ||
59 | enum exstate4 be_state; /* the state of this extent */ | ||
60 | struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */ | ||
61 | }; | ||
62 | |||
63 | static inline void | ||
64 | BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize) | ||
65 | { | ||
66 | /* STUB */ | ||
67 | } | ||
68 | |||
69 | enum extentclass4 { | ||
70 | RW_EXTENT = 0, /* READWRTE and INVAL */ | ||
71 | RO_EXTENT = 1, /* READ and NONE */ | ||
72 | EXTENT_LISTS = 2, | ||
73 | }; | ||
74 | |||
75 | struct pnfs_block_layout { | ||
76 | struct pnfs_layout_hdr bl_layout; | ||
77 | struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */ | ||
78 | spinlock_t bl_ext_lock; /* Protects list manipulation */ | ||
79 | struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */ | ||
80 | struct list_head bl_commit; /* Needs layout commit */ | ||
81 | struct list_head bl_committing; /* Layout committing */ | ||
82 | unsigned int bl_count; /* entries in bl_commit */ | ||
83 | sector_t bl_blocksize; /* Server blocksize in sectors */ | ||
84 | }; | ||
85 | |||
86 | static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo) | ||
87 | { | ||
88 | return container_of(lo, struct pnfs_block_layout, bl_layout); | ||
89 | } | ||
90 | |||
91 | #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ | ||