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authorChristoph Hellwig <hch@sgi.com>2006-01-11 15:40:13 +1100
committerNathan Scott <nathans@sgi.com>2006-01-11 15:40:13 +1100
commitf6d6d4fcd180f8e47bf6b13fc6cce1e6c156d0ea (patch)
tree2d4e981bb61f564904f7b7ca1ab69d163c0f69dd /fs/xfs/linux-2.6/xfs_aops.h
parentce8e922c0e79c8093452ba9a124981332b75706b (diff)
[XFS] Initial pass at going directly-to-bio on the buffered IO path. This
allows us to submit much larger I/Os instead of sending down lots of small buffer_heads. To do this we need to have a rather complicated I/O submission and completion tracking infrastructure. Part of the latter has been merged already a long time ago for direct I/O support. Part of the problem is that we need to track sub-pagesize regions and for that we still need buffer_heads for the time beeing. Long-term I hope we can move to better data strucutures and/or maybe move this to fs/mpage.c instead of having it in XFS. Original patch from Nathan Scott with various updates from David Chinner and Christoph Hellwig. SGI-PV: 947118 SGI-Modid: xfs-linux-melb:xfs-kern:203822a Signed-off-by: Christoph Hellwig <hch@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_aops.h')
-rw-r--r--fs/xfs/linux-2.6/xfs_aops.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.h b/fs/xfs/linux-2.6/xfs_aops.h
index 4720758a9ade..55339dd5a30d 100644
--- a/fs/xfs/linux-2.6/xfs_aops.h
+++ b/fs/xfs/linux-2.6/xfs_aops.h
@@ -23,14 +23,24 @@ extern mempool_t *xfs_ioend_pool;
typedef void (*xfs_ioend_func_t)(void *);
+/*
+ * xfs_ioend struct manages large extent writes for XFS.
+ * It can manage several multi-page bio's at once.
+ */
typedef struct xfs_ioend {
+ struct xfs_ioend *io_list; /* next ioend in chain */
+ unsigned int io_type; /* delalloc / unwritten */
unsigned int io_uptodate; /* I/O status register */
atomic_t io_remaining; /* hold count */
struct vnode *io_vnode; /* file being written to */
struct buffer_head *io_buffer_head;/* buffer linked list head */
+ struct buffer_head *io_buffer_tail;/* buffer linked list tail */
size_t io_size; /* size of the extent */
xfs_off_t io_offset; /* offset in the file */
struct work_struct io_work; /* xfsdatad work queue */
} xfs_ioend_t;
+extern struct address_space_operations linvfs_aops;
+extern int linvfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
+
#endif /* __XFS_IOPS_H__ */