Commit f6d6d4fc authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Nathan Scott
Browse files

[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: default avatarChristoph Hellwig <hch@sgi.com>
Signed-off-by: default avatarNathan Scott <nathans@sgi.com>
parent ce8e922c

fs/xfs/linux-2.6/xfs_aops.c

+421 −355

File changed.

Preview size limit exceeded, changes collapsed.

fs/xfs/linux-2.6/xfs_aops.h

+10 −0
Original line number Diff line number Diff line
@@ -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__ */

fs/xfs/linux-2.6/xfs_iops.h

+0 −5
Original line number Diff line number Diff line
@@ -26,11 +26,6 @@ extern struct file_operations linvfs_file_operations; 
extern struct file_operations linvfs_invis_file_operations;

extern struct file_operations linvfs_dir_operations;



extern struct address_space_operations linvfs_aops;



extern int linvfs_get_block(struct inode *, sector_t, struct buffer_head *, int);

extern void linvfs_unwritten_done(struct buffer_head *, int);



extern int xfs_ioctl(struct bhv_desc *, struct inode *, struct file *,

                        int, unsigned int, void __user *);

fs/xfs/linux-2.6/xfs_linux.h

+0 −4
Original line number Diff line number Diff line
@@ -110,10 +110,6 @@ 
 * delalloc and these ondisk-uninitialised buffers.

 */

BUFFER_FNS(PrivateStart, unwritten);

static inline void set_buffer_unwritten_io(struct buffer_head *bh)

{

	bh->b_end_io = linvfs_unwritten_done;

}



#define restricted_chown	xfs_params.restrict_chown.val

#define irix_sgid_inherit	xfs_params.sgid_inherit.val

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