| 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__ */ |