92 строки
3.5 KiB
C
92 строки
3.5 KiB
C
/*
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* Copyright (c) 2003-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_IOMAP_H__
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#define __XFS_IOMAP_H__
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#define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL))
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typedef enum { /* iomap_flags values */
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IOMAP_READ = 0, /* mapping for a read */
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IOMAP_EOF = 0x01, /* mapping contains EOF */
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IOMAP_HOLE = 0x02, /* mapping covers a hole */
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IOMAP_DELAY = 0x04, /* mapping covers delalloc region */
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IOMAP_REALTIME = 0x10, /* mapping on the realtime device */
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IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */
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/* but uninitialized file data */
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IOMAP_NEW = 0x40 /* just allocate */
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} iomap_flags_t;
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typedef enum {
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/* base extent manipulation calls */
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BMAPI_READ = (1 << 0), /* read extents */
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BMAPI_WRITE = (1 << 1), /* create extents */
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BMAPI_ALLOCATE = (1 << 2), /* delayed allocate to real extents */
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BMAPI_UNWRITTEN = (1 << 3), /* unwritten extents to real extents */
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/* modifiers */
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BMAPI_IGNSTATE = (1 << 4), /* ignore unwritten state on read */
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BMAPI_DIRECT = (1 << 5), /* direct instead of buffered write */
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BMAPI_MMAP = (1 << 6), /* allocate for mmap write */
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BMAPI_SYNC = (1 << 7), /* sync write to flush delalloc space */
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BMAPI_TRYLOCK = (1 << 8), /* non-blocking request */
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BMAPI_DEVICE = (1 << 9), /* we only want to know the device */
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} bmapi_flags_t;
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/*
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* xfs_iomap_t: File system I/O map
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*
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* The iomap_bn field is expressed in 512-byte blocks, and is where the
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* mapping starts on disk.
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*
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* The iomap_offset, iomap_bsize and iomap_delta fields are in bytes.
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* iomap_offset is the offset of the mapping in the file itself.
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* iomap_bsize is the size of the mapping, iomap_delta is the
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* desired data's offset into the mapping, given the offset supplied
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* to the file I/O map routine.
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*
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* When a request is made to read beyond the logical end of the object,
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* iomap_size may be set to 0, but iomap_offset and iomap_length should be set
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* to the actual amount of underlying storage that has been allocated, if any.
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*/
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typedef struct xfs_iomap {
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xfs_daddr_t iomap_bn; /* first 512b blk of mapping */
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xfs_buftarg_t *iomap_target;
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xfs_off_t iomap_offset; /* offset of mapping, bytes */
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xfs_off_t iomap_bsize; /* size of mapping, bytes */
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xfs_off_t iomap_delta; /* offset into mapping, bytes */
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iomap_flags_t iomap_flags;
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} xfs_iomap_t;
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struct xfs_iocore;
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struct xfs_inode;
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struct xfs_bmbt_irec;
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extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int,
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struct xfs_iomap *, int *);
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extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
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int, struct xfs_bmbt_irec *, int *, int);
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extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int,
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struct xfs_bmbt_irec *, int *);
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extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t,
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struct xfs_bmbt_irec *, int *);
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extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t);
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#endif /* __XFS_IOMAP_H__*/
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