Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 2 | * Copyright (c) 2003-2005 Silicon Graphics, Inc. All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 56 | BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 67 | * The iomap_bn field is expressed in 512-byte blocks, and is where the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 84 | xfs_off_t iomap_offset; /* offset of mapping, bytes */ |
| 85 | xfs_off_t iomap_bsize; /* size of mapping, bytes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 *); |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 96 | extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | int, struct xfs_bmbt_irec *, int *, int); |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 98 | extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | struct xfs_bmbt_irec *, int *); |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 100 | extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | struct xfs_bmbt_irec *, int *); |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 102 | extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | #endif /* __XFS_IOMAP_H__*/ |