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Diffstat (limited to 'fs/xfs/xfs_iomap.h')
| -rw-r--r-- | fs/xfs/xfs_iomap.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h new file mode 100644 index 00000000000..31c91087cb3 --- /dev/null +++ b/fs/xfs/xfs_iomap.h @@ -0,0 +1,107 @@ +/* + * Copyright (c) 2003,2004 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 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. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ + + + +#ifndef __XFS_IOMAP_H__ +#define __XFS_IOMAP_H__ + +#define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL)) + + +typedef enum { /* iomap_flags values */ + IOMAP_EOF = 0x01, /* mapping contains EOF */ + IOMAP_HOLE = 0x02, /* mapping covers a hole */ + IOMAP_DELAY = 0x04, /* mapping covers delalloc region */ + IOMAP_REALTIME = 0x10, /* mapping on the realtime device */ + 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 */ + BMAPI_UNWRITTEN = (1 << 3), /* unwritten extents 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_SYNC = (1 << 7), /* sync write to flush delalloc space */ + BMAPI_TRYLOCK = (1 << 8), /* non-blocking request */ + BMAPI_DEVICE = (1 << 9), /* we only want to know the device */ +} bmapi_flags_t; + + +/* + * 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_buftarg_t *iomap_target; + loff_t iomap_offset; /* offset of mapping, bytes */ + loff_t iomap_bsize; /* size of mapping, bytes */ + size_t iomap_delta; /* offset into mapping, bytes */ + iomap_flags_t iomap_flags; +} xfs_iomap_t; + +struct xfs_iocore; +struct xfs_inode; +struct xfs_bmbt_irec; + +extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int, + struct xfs_iomap *, int *); +extern int xfs_iomap_write_direct(struct xfs_inode *, loff_t, size_t, + int, struct xfs_bmbt_irec *, int *, int); +extern int xfs_iomap_write_delay(struct xfs_inode *, loff_t, size_t, int, + struct xfs_bmbt_irec *, int *); +extern int xfs_iomap_write_allocate(struct xfs_inode *, + struct xfs_bmbt_irec *, int *); +extern int xfs_iomap_write_unwritten(struct xfs_inode *, loff_t, size_t); + +#endif /* __XFS_IOMAP_H__*/ |