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_EOF = 0x01, /* mapping contains EOF */ 27 IOMAP_HOLE = 0x02, /* mapping covers a hole */ 28 IOMAP_DELAY = 0x04, /* mapping covers delalloc region */ 29 IOMAP_REALTIME = 0x10, /* mapping on the realtime device */ 30 IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */ 31 /* but uninitialized file data */ 32 IOMAP_NEW = 0x40 /* just allocate */ 33 } iomap_flags_t; 34 35 typedef enum { 36 /* base extent manipulation calls */ 37 BMAPI_READ = (1 << 0), /* read extents */ 38 BMAPI_WRITE = (1 << 1), /* create extents */ 39 BMAPI_ALLOCATE = (1 << 2), /* delayed allocate to real extents */ 40 BMAPI_UNWRITTEN = (1 << 3), /* unwritten extents to real extents */ 41 /* modifiers */ 42 BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */ 43 BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */ 44 BMAPI_MMAP = (1 << 6), /* allocate for mmap write */ 45 BMAPI_SYNC = (1 << 7), /* sync write to flush delalloc space */ 46 BMAPI_TRYLOCK = (1 << 8), /* non-blocking request */ 47 BMAPI_DEVICE = (1 << 9), /* we only want to know the device */ 48 } bmapi_flags_t; 49 50 51 /* 52 * xfs_iomap_t: File system I/O map 53 * 54 * The iomap_bn field is expressed in 512-byte blocks, and is where the 55 * mapping starts on disk. 56 * 57 * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes. 58 * iomap_offset is the offset of the mapping in the file itself. 59 * iomap_bsize is the size of the mapping, iomap_delta is the 60 * desired data's offset into the mapping, given the offset supplied 61 * to the file I/O map routine. 62 * 63 * When a request is made to read beyond the logical end of the object, 64 * iomap_size may be set to 0, but iomap_offset and iomap_length should be set 65 * to the actual amount of underlying storage that has been allocated, if any. 66 */ 67 68 typedef struct xfs_iomap { 69 xfs_daddr_t iomap_bn; /* first 512b blk of mapping */ 70 xfs_buftarg_t *iomap_target; 71 xfs_off_t iomap_offset; /* offset of mapping, bytes */ 72 xfs_off_t iomap_bsize; /* size of mapping, bytes */ 73 xfs_off_t iomap_delta; /* offset into mapping, bytes */ 74 iomap_flags_t iomap_flags; 75 } xfs_iomap_t; 76 77 struct xfs_iocore; 78 struct xfs_inode; 79 struct xfs_bmbt_irec; 80 81 extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int, 82 struct xfs_iomap *, int *); 83 extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t, 84 int, struct xfs_bmbt_irec *, int *, int); 85 extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int, 86 struct xfs_bmbt_irec *, int *); 87 extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t, 88 struct xfs_bmbt_irec *, int *); 89 extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t); 90 91 #endif /* __XFS_IOMAP_H__*/ 92