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 */ 32 33 34 35 #ifndef __XFS_IOMAP_H__ 36 #define __XFS_IOMAP_H__ 37 38 #define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL)) 39 40 41 typedef enum { /* iomap_flags values */ 42 IOMAP_EOF = 0x01, /* mapping contains EOF */ 43 IOMAP_HOLE = 0x02, /* mapping covers a hole */ 44 IOMAP_DELAY = 0x04, /* mapping covers delalloc region */ 45 IOMAP_REALTIME = 0x10, /* mapping on the realtime device */ 46 IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */ 47 /* but uninitialized file data */ 48 IOMAP_NEW = 0x40 /* just allocate */ 49 } iomap_flags_t; 50 51 typedef enum { 52 /* base extent manipulation calls */ 53 BMAPI_READ = (1 << 0), /* read extents */ 54 BMAPI_WRITE = (1 << 1), /* create extents */ 55 BMAPI_ALLOCATE = (1 << 2), /* delayed allocate to real extents */ 56 BMAPI_UNWRITTEN = (1 << 3), /* unwritten extents to real extents */ 57 /* modifiers */ 58 BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */ 59 BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */ 60 BMAPI_MMAP = (1 << 6), /* allocate for mmap write */ 61 BMAPI_SYNC = (1 << 7), /* sync write to flush delalloc space */ 62 BMAPI_TRYLOCK = (1 << 8), /* non-blocking request */ 63 BMAPI_DEVICE = (1 << 9), /* we only want to know the device */ 64 } bmapi_flags_t; 65 66 67 /* 68 * xfs_iomap_t: File system I/O map 69 * 70 * The iomap_bn field is expressed in 512-byte blocks, and is where the 71 * mapping starts on disk. 72 * 73 * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes. 74 * iomap_offset is the offset of the mapping in the file itself. 75 * iomap_bsize is the size of the mapping, iomap_delta is the 76 * desired data's offset into the mapping, given the offset supplied 77 * to the file I/O map routine. 78 * 79 * When a request is made to read beyond the logical end of the object, 80 * iomap_size may be set to 0, but iomap_offset and iomap_length should be set 81 * to the actual amount of underlying storage that has been allocated, if any. 82 */ 83 84 typedef struct xfs_iomap { 85 xfs_daddr_t iomap_bn; /* first 512b blk of mapping */ 86 xfs_buftarg_t *iomap_target; 87 loff_t iomap_offset; /* offset of mapping, bytes */ 88 loff_t iomap_bsize; /* size of mapping, bytes */ 89 size_t iomap_delta; /* offset into mapping, bytes */ 90 iomap_flags_t iomap_flags; 91 } xfs_iomap_t; 92 93 struct xfs_iocore; 94 struct xfs_inode; 95 struct xfs_bmbt_irec; 96 97 extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int, 98 struct xfs_iomap *, int *); 99 extern int xfs_iomap_write_direct(struct xfs_inode *, loff_t, size_t, 100 int, struct xfs_bmbt_irec *, int *, int); 101 extern int xfs_iomap_write_delay(struct xfs_inode *, loff_t, size_t, int, 102 struct xfs_bmbt_irec *, int *); 103 extern int xfs_iomap_write_allocate(struct xfs_inode *, 104 struct xfs_bmbt_irec *, int *); 105 extern int xfs_iomap_write_unwritten(struct xfs_inode *, loff_t, size_t); 106 107 #endif /* __XFS_IOMAP_H__*/ 108