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 struct workqueue_struct *xfsdatad_workqueue; 22 extern struct workqueue_struct *xfsconvertd_workqueue; 23 extern mempool_t *xfs_ioend_pool; 24 25 /* 26 * Types of I/O for bmap clustering and I/O completion tracking. 27 */ 28 enum { 29 IO_DIRECT = 0, /* special case for direct I/O ioends */ 30 IO_DELALLOC, /* mapping covers delalloc region */ 31 IO_UNWRITTEN, /* mapping covers allocated but uninitialized data */ 32 IO_OVERWRITE, /* mapping covers already allocated extent */ 33 }; 34 35 #define XFS_IO_TYPES \ 36 { 0, "" }, \ 37 { IO_DELALLOC, "delalloc" }, \ 38 { IO_UNWRITTEN, "unwritten" }, \ 39 { IO_OVERWRITE, "overwrite" } 40 41 /* 42 * xfs_ioend struct manages large extent writes for XFS. 43 * It can manage several multi-page bio's at once. 44 */ 45 typedef struct xfs_ioend { 46 struct xfs_ioend *io_list; /* next ioend in chain */ 47 unsigned int io_type; /* delalloc / unwritten */ 48 int io_error; /* I/O error code */ 49 atomic_t io_remaining; /* hold count */ 50 unsigned int io_isasync : 1; /* needs aio_complete */ 51 struct inode *io_inode; /* file being written to */ 52 struct buffer_head *io_buffer_head;/* buffer linked list head */ 53 struct buffer_head *io_buffer_tail;/* buffer linked list tail */ 54 size_t io_size; /* size of the extent */ 55 xfs_off_t io_offset; /* offset in the file */ 56 struct work_struct io_work; /* xfsdatad work queue */ 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__ */ 67