Fred Isaman | 155e752 | 2011-07-30 20:52:39 -0400 | [diff] [blame^] | 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 */ |