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1 | /* | |
2 | * Copyright (c) 2003-2005 Silicon Graphics, Inc. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it would be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | #ifndef __XFS_IOMAP_H__ | |
19 | #define __XFS_IOMAP_H__ | |
20 | ||
21 | #define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL)) | |
22 | ||
23 | ||
24 | typedef enum { /* iomap_flags values */ | |
25 | IOMAP_EOF = 0x01, /* mapping contains EOF */ | |
26 | IOMAP_HOLE = 0x02, /* mapping covers a hole */ | |
27 | IOMAP_DELAY = 0x04, /* mapping covers delalloc region */ | |
28 | IOMAP_REALTIME = 0x10, /* mapping on the realtime device */ | |
29 | IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */ | |
30 | /* but uninitialized file data */ | |
31 | IOMAP_NEW = 0x40 /* just allocate */ | |
32 | } iomap_flags_t; | |
33 | ||
34 | typedef enum { | |
35 | /* base extent manipulation calls */ | |
36 | BMAPI_READ = (1 << 0), /* read extents */ | |
37 | BMAPI_WRITE = (1 << 1), /* create extents */ | |
38 | BMAPI_ALLOCATE = (1 << 2), /* delayed allocate to real extents */ | |
39 | BMAPI_UNWRITTEN = (1 << 3), /* unwritten extents to real extents */ | |
40 | /* modifiers */ | |
41 | BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */ | |
42 | BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */ | |
43 | BMAPI_MMAP = (1 << 6), /* allocate for mmap write */ | |
44 | BMAPI_SYNC = (1 << 7), /* sync write to flush delalloc space */ | |
45 | BMAPI_TRYLOCK = (1 << 8), /* non-blocking request */ | |
46 | BMAPI_DEVICE = (1 << 9), /* we only want to know the device */ | |
47 | } bmapi_flags_t; | |
48 | ||
49 | ||
50 | /* | |
51 | * xfs_iomap_t: File system I/O map | |
52 | * | |
53 | * The iomap_bn field is expressed in 512-byte blocks, and is where the | |
54 | * mapping starts on disk. | |
55 | * | |
56 | * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes. | |
57 | * iomap_offset is the offset of the mapping in the file itself. | |
58 | * iomap_bsize is the size of the mapping, iomap_delta is the | |
59 | * desired data's offset into the mapping, given the offset supplied | |
60 | * to the file I/O map routine. | |
61 | * | |
62 | * When a request is made to read beyond the logical end of the object, | |
63 | * iomap_size may be set to 0, but iomap_offset and iomap_length should be set | |
64 | * to the actual amount of underlying storage that has been allocated, if any. | |
65 | */ | |
66 | ||
67 | typedef struct xfs_iomap { | |
68 | xfs_daddr_t iomap_bn; /* first 512b blk of mapping */ | |
69 | xfs_buftarg_t *iomap_target; | |
70 | xfs_off_t iomap_offset; /* offset of mapping, bytes */ | |
71 | xfs_off_t iomap_bsize; /* size of mapping, bytes */ | |
72 | size_t iomap_delta; /* offset into mapping, bytes */ | |
73 | iomap_flags_t iomap_flags; | |
74 | } xfs_iomap_t; | |
75 | ||
76 | struct xfs_iocore; | |
77 | struct xfs_inode; | |
78 | struct xfs_bmbt_irec; | |
79 | ||
80 | extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int, | |
81 | struct xfs_iomap *, int *); | |
82 | extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t, | |
83 | int, struct xfs_bmbt_irec *, int *, int); | |
84 | extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int, | |
85 | struct xfs_bmbt_irec *, int *); | |
86 | extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t, | |
87 | struct xfs_bmbt_irec *, int *); | |
88 | extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t); | |
89 | ||
90 | #endif /* __XFS_IOMAP_H__*/ |