| /* |
| * Copyright (c) 2003-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #ifndef __XFS_IOMAP_H__ |
| #define __XFS_IOMAP_H__ |
| |
| typedef enum { /* iomap_flags values */ |
| IOMAP_READ = 0, /* mapping for a read */ |
| IOMAP_DELAY = 0x04, /* mapping covers delalloc region */ |
| IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */ |
| /* but uninitialized file data */ |
| IOMAP_NEW = 0x40 /* just allocate */ |
| } iomap_flags_t; |
| |
| typedef enum { |
| /* base extent manipulation calls */ |
| BMAPI_READ = (1 << 0), /* read extents */ |
| BMAPI_WRITE = (1 << 1), /* create extents */ |
| BMAPI_ALLOCATE = (1 << 2), /* delayed allocate to real extents */ |
| /* modifiers */ |
| BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */ |
| BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */ |
| BMAPI_MMAP = (1 << 6), /* allocate for mmap write */ |
| BMAPI_TRYLOCK = (1 << 7), /* non-blocking request */ |
| } bmapi_flags_t; |
| |
| #define BMAPI_FLAGS \ |
| { BMAPI_READ, "READ" }, \ |
| { BMAPI_WRITE, "WRITE" }, \ |
| { BMAPI_ALLOCATE, "ALLOCATE" }, \ |
| { BMAPI_IGNSTATE, "IGNSTATE" }, \ |
| { BMAPI_DIRECT, "DIRECT" }, \ |
| { BMAPI_MMAP, "MMAP" }, \ |
| { BMAPI_TRYLOCK, "TRYLOCK" } |
| |
| /* |
| * xfs_iomap_t: File system I/O map |
| * |
| * The iomap_bn field is expressed in 512-byte blocks, and is where the |
| * mapping starts on disk. |
| * |
| * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes. |
| * iomap_offset is the offset of the mapping in the file itself. |
| * iomap_bsize is the size of the mapping, iomap_delta is the |
| * desired data's offset into the mapping, given the offset supplied |
| * to the file I/O map routine. |
| * |
| * When a request is made to read beyond the logical end of the object, |
| * iomap_size may be set to 0, but iomap_offset and iomap_length should be set |
| * to the actual amount of underlying storage that has been allocated, if any. |
| */ |
| |
| typedef struct xfs_iomap { |
| xfs_daddr_t iomap_bn; /* first 512B blk of mapping */ |
| xfs_off_t iomap_offset; /* offset of mapping, bytes */ |
| xfs_off_t iomap_bsize; /* size of mapping, bytes */ |
| iomap_flags_t iomap_flags; |
| } xfs_iomap_t; |
| |
| struct xfs_inode; |
| struct xfs_bmbt_irec; |
| |
| extern int xfs_iomap(struct xfs_inode *, xfs_off_t, ssize_t, int, |
| struct xfs_iomap *, int *); |
| extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t, |
| int, struct xfs_bmbt_irec *, int *, int); |
| extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int, |
| struct xfs_bmbt_irec *, int *); |
| extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t, |
| struct xfs_bmbt_irec *, int *); |
| extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t); |
| |
| #endif /* __XFS_IOMAP_H__*/ |