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[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>
This commit is contained in:
Christoph Hellwig 2006-01-11 15:40:13 +11:00 committed by Nathan Scott
parent ce8e922c0e
commit f6d6d4fcd1
4 changed files with 431 additions and 364 deletions
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776
fs/xfs/linux-2.6/xfs_aops.c
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10
fs/xfs/linux-2.6/xfs_aops.h
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@ -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__ */

5
fs/xfs/linux-2.6/xfs_iops.h
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@ -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 *);

4
fs/xfs/linux-2.6/xfs_linux.h
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@ -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