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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2003,2004 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
1da177e4 LT |
32 | #ifndef __XFS_IOMAP_H__ |
33 | #define __XFS_IOMAP_H__ | |
34 | ||
35 | #define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL)) | |
36 | ||
37 | ||
38 | typedef enum { /* iomap_flags values */ | |
39 | IOMAP_EOF = 0x01, /* mapping contains EOF */ | |
40 | IOMAP_HOLE = 0x02, /* mapping covers a hole */ | |
41 | IOMAP_DELAY = 0x04, /* mapping covers delalloc region */ | |
42 | IOMAP_REALTIME = 0x10, /* mapping on the realtime device */ | |
43 | IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */ | |
44 | /* but uninitialized file data */ | |
45 | IOMAP_NEW = 0x40 /* just allocate */ | |
46 | } iomap_flags_t; | |
47 | ||
48 | typedef enum { | |
49 | /* base extent manipulation calls */ | |
50 | BMAPI_READ = (1 << 0), /* read extents */ | |
51 | BMAPI_WRITE = (1 << 1), /* create extents */ | |
52 | BMAPI_ALLOCATE = (1 << 2), /* delayed allocate to real extents */ | |
53 | BMAPI_UNWRITTEN = (1 << 3), /* unwritten extents to real extents */ | |
54 | /* modifiers */ | |
55 | BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */ | |
24e17b5f | 56 | BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */ |
1da177e4 LT |
57 | BMAPI_MMAP = (1 << 6), /* allocate for mmap write */ |
58 | BMAPI_SYNC = (1 << 7), /* sync write to flush delalloc space */ | |
59 | BMAPI_TRYLOCK = (1 << 8), /* non-blocking request */ | |
60 | BMAPI_DEVICE = (1 << 9), /* we only want to know the device */ | |
61 | } bmapi_flags_t; | |
62 | ||
63 | ||
64 | /* | |
65 | * xfs_iomap_t: File system I/O map | |
66 | * | |
67 | * The iomap_bn field is expressed in 512-byte blocks, and is where the | |
68 | * mapping starts on disk. | |
69 | * | |
70 | * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes. | |
71 | * iomap_offset is the offset of the mapping in the file itself. | |
72 | * iomap_bsize is the size of the mapping, iomap_delta is the | |
73 | * desired data's offset into the mapping, given the offset supplied | |
74 | * to the file I/O map routine. | |
75 | * | |
76 | * When a request is made to read beyond the logical end of the object, | |
77 | * iomap_size may be set to 0, but iomap_offset and iomap_length should be set | |
78 | * to the actual amount of underlying storage that has been allocated, if any. | |
79 | */ | |
80 | ||
81 | typedef struct xfs_iomap { | |
82 | xfs_daddr_t iomap_bn; /* first 512b blk of mapping */ | |
83 | xfs_buftarg_t *iomap_target; | |
84 | loff_t iomap_offset; /* offset of mapping, bytes */ | |
85 | loff_t iomap_bsize; /* size of mapping, bytes */ | |
86 | size_t iomap_delta; /* offset into mapping, bytes */ | |
87 | iomap_flags_t iomap_flags; | |
88 | } xfs_iomap_t; | |
89 | ||
90 | struct xfs_iocore; | |
91 | struct xfs_inode; | |
92 | struct xfs_bmbt_irec; | |
93 | ||
94 | extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int, | |
95 | struct xfs_iomap *, int *); | |
96 | extern int xfs_iomap_write_direct(struct xfs_inode *, loff_t, size_t, | |
97 | int, struct xfs_bmbt_irec *, int *, int); | |
98 | extern int xfs_iomap_write_delay(struct xfs_inode *, loff_t, size_t, int, | |
99 | struct xfs_bmbt_irec *, int *); | |
24e17b5f | 100 | extern int xfs_iomap_write_allocate(struct xfs_inode *, loff_t, size_t, |
1da177e4 LT |
101 | struct xfs_bmbt_irec *, int *); |
102 | extern int xfs_iomap_write_unwritten(struct xfs_inode *, loff_t, size_t); | |
103 | ||
104 | #endif /* __XFS_IOMAP_H__*/ |