linux/fs/xfs/xfs_aops.h
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   1/*
   2 * Copyright (c) 2005-2006 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_AOPS_H__
  19#define __XFS_AOPS_H__
  20
  21extern mempool_t *xfs_ioend_pool;
  22
  23/*
  24 * Types of I/O for bmap clustering and I/O completion tracking.
  25 */
  26enum {
  27        XFS_IO_DIRECT = 0,      /* special case for direct I/O ioends */
  28        XFS_IO_DELALLOC,        /* covers delalloc region */
  29        XFS_IO_UNWRITTEN,       /* covers allocated but uninitialized data */
  30        XFS_IO_OVERWRITE,       /* covers already allocated extent */
  31};
  32
  33#define XFS_IO_TYPES \
  34        { 0,                    "" }, \
  35        { XFS_IO_DELALLOC,              "delalloc" }, \
  36        { XFS_IO_UNWRITTEN,             "unwritten" }, \
  37        { XFS_IO_OVERWRITE,             "overwrite" }
  38
  39/*
  40 * xfs_ioend struct manages large extent writes for XFS.
  41 * It can manage several multi-page bio's at once.
  42 */
  43typedef struct xfs_ioend {
  44        struct xfs_ioend        *io_list;       /* next ioend in chain */
  45        unsigned int            io_type;        /* delalloc / unwritten */
  46        int                     io_error;       /* I/O error code */
  47        atomic_t                io_remaining;   /* hold count */
  48        unsigned int            io_isasync : 1; /* needs aio_complete */
  49        unsigned int            io_isdirect : 1;/* direct I/O */
  50        struct inode            *io_inode;      /* file being written to */
  51        struct buffer_head      *io_buffer_head;/* buffer linked list head */
  52        struct buffer_head      *io_buffer_tail;/* buffer linked list tail */
  53        size_t                  io_size;        /* size of the extent */
  54        xfs_off_t               io_offset;      /* offset in the file */
  55        struct work_struct      io_work;        /* xfsdatad work queue */
  56        struct xfs_trans        *io_append_trans;/* xact. for size update */
  57        struct kiocb            *io_iocb;
  58        int                     io_result;
  59} xfs_ioend_t;
  60
  61extern const struct address_space_operations xfs_address_space_operations;
  62extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
  63
  64extern void xfs_count_page_state(struct page *, int *, int *);
  65
  66#endif /* __XFS_AOPS_H__ */
  67
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