summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_iomap.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_iomap.h')
-rw-r--r--fs/xfs/xfs_iomap.h107
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 000000000000..31c91087cb33
--- /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__*/