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_READ = 0, /* mapping for a read */
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 /* modifiers */
40 BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */
41 BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */
42 BMAPI_MMAP = (1 << 6), /* allocate for mmap write */
43 BMAPI_TRYLOCK = (1 << 7), /* non-blocking request */
44 } bmapi_flags_t;
45
46
47 /*
48 * xfs_iomap_t: File system I/O map
49 *
50 * The iomap_bn field is expressed in 512-byte blocks, and is where the
51 * mapping starts on disk.
52 *
53 * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes.
54 * iomap_offset is the offset of the mapping in the file itself.
55 * iomap_bsize is the size of the mapping, iomap_delta is the
56 * desired data's offset into the mapping, given the offset supplied
57 * to the file I/O map routine.
58 *
59 * When a request is made to read beyond the logical end of the object,
60 * iomap_size may be set to 0, but iomap_offset and iomap_length should be set
61 * to the actual amount of underlying storage that has been allocated, if any.
62 */
63
64 typedef struct xfs_iomap {
65 xfs_daddr_t iomap_bn; /* first 512B blk of mapping */
66 xfs_buftarg_t *iomap_target;
67 xfs_off_t iomap_offset; /* offset of mapping, bytes */
68 xfs_off_t iomap_bsize; /* size of mapping, bytes */
69 xfs_off_t iomap_delta; /* offset into mapping, bytes */
70 iomap_flags_t iomap_flags;
71 } xfs_iomap_t;
72
73 struct xfs_inode;
74 struct xfs_bmbt_irec;
75
76 extern int xfs_iomap(struct xfs_inode *, xfs_off_t, ssize_t, int,
77 struct xfs_iomap *, int *);
78 extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
79 int, struct xfs_bmbt_irec *, int *, int);
80 extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int,
81 struct xfs_bmbt_irec *, int *);
82 extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t,
83 struct xfs_bmbt_irec *, int *);
84 extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t);
85
86 #endif /* __XFS_IOMAP_H__*/
87
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