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 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 */ 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_isdirect : 1;/* direct I/O */ 49 struct inode *io_inode; /* file being written to */ 50 struct buffer_head *io_buffer_head;/* buffer linked list head */ 51 struct buffer_head *io_buffer_tail;/* buffer linked list tail */ 52 size_t io_size; /* size of the extent */ 53 xfs_off_t io_offset; /* offset in the file */ 54 struct work_struct io_work; /* xfsdatad work queue */ 55 struct xfs_trans *io_append_trans;/* xact. for size update */ 56 } xfs_ioend_t; 57 58 extern const struct address_space_operations xfs_address_space_operations; 59 extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int); 60 61 extern void xfs_count_page_state(struct page *, int *, int *); 62 63 #endif /* __XFS_AOPS_H__ */ 64