fs/xfs/xfs_aops.h

   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
  21 extern mempool_t *xfs_ioend_pool;
  22
  23 /*
  24  * Types of I/O for bmap clustering and I/O completion tracking.
  25  */
  26 enum {
  27         IO_DIRECT = 0,  /* special case for direct I/O ioends */
  28         IO_DELALLOC,    /* mapping covers delalloc region */
  29         IO_UNWRITTEN,   /* mapping covers allocated but uninitialized data */
  30         IO_OVERWRITE,   /* mapping covers already allocated extent */
  31 };
  32
  33 #define XFS_IO_TYPES \
  34         { 0,                    "" }, \
  35         { IO_DELALLOC,          "delalloc" }, \
  36         { IO_UNWRITTEN,         "unwritten" }, \
  37         { 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  */
  43 typedef 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
  61 extern const struct address_space_operations xfs_address_space_operations;
  62 extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
  63
  64 extern void xfs_count_page_state(struct page *, int *, int *);
  65
  66 #endif /* __XFS_AOPS_H__ */