aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_iomap.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_iomap.h')
-rw-r--r--fs/xfs/xfs_iomap.h47
1 files changed, 1 insertions, 46 deletions
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
index 174f29990991..81ac4afd45b3 100644
--- a/fs/xfs/xfs_iomap.h
+++ b/fs/xfs/xfs_iomap.h
@@ -18,19 +18,6 @@
18#ifndef __XFS_IOMAP_H__ 18#ifndef __XFS_IOMAP_H__
19#define __XFS_IOMAP_H__ 19#define __XFS_IOMAP_H__
20 20
21#define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL))
22
23
24typedef 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
34typedef enum { 21typedef enum {
35 /* base extent manipulation calls */ 22 /* base extent manipulation calls */
36 BMAPI_READ = (1 << 0), /* read extents */ 23 BMAPI_READ = (1 << 0), /* read extents */
@@ -52,43 +39,11 @@ typedef enum {
52 { BMAPI_MMAP, "MMAP" }, \ 39 { BMAPI_MMAP, "MMAP" }, \
53 { BMAPI_TRYLOCK, "TRYLOCK" } 40 { BMAPI_TRYLOCK, "TRYLOCK" }
54 41
55/*
56 * xfs_iomap_t: File system I/O map
57 *
58 * The iomap_bn field is expressed in 512-byte blocks, and is where the
59 * mapping starts on disk.
60 *
61 * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes.
62 * iomap_offset is the offset of the mapping in the file itself.
63 * iomap_bsize is the size of the mapping, iomap_delta is the
64 * desired data's offset into the mapping, given the offset supplied
65 * to the file I/O map routine.
66 *
67 * When a request is made to read beyond the logical end of the object,
68 * iomap_size may be set to 0, but iomap_offset and iomap_length should be set
69 * to the actual amount of underlying storage that has been allocated, if any.
70 */
71
72typedef struct xfs_iomap {
73 xfs_daddr_t iomap_bn; /* first 512B blk of mapping */
74 xfs_buftarg_t *iomap_target;
75 xfs_off_t iomap_offset; /* offset of mapping, bytes */
76 xfs_off_t iomap_bsize; /* size of mapping, bytes */
77 xfs_off_t iomap_delta; /* offset into mapping, bytes */
78 iomap_flags_t iomap_flags;
79} xfs_iomap_t;
80
81struct xfs_inode; 42struct xfs_inode;
82struct xfs_bmbt_irec; 43struct xfs_bmbt_irec;
83 44
84extern int xfs_iomap(struct xfs_inode *, xfs_off_t, ssize_t, int, 45extern int xfs_iomap(struct xfs_inode *, xfs_off_t, ssize_t, int,
85 struct xfs_iomap *, int *); 46 struct xfs_bmbt_irec *, int *, int *);
86extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
87 int, struct xfs_bmbt_irec *, int *, int);
88extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int,
89 struct xfs_bmbt_irec *, int *);
90extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t,
91 struct xfs_bmbt_irec *, int *);
92extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t); 47extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t);
93 48
94#endif /* __XFS_IOMAP_H__*/ 49#endif /* __XFS_IOMAP_H__*/