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Subjectpatch: aio + bio for raw io
Quick message: this patch makes aio use bio directly for brw_kvec_async.  
This is against yesterday's patchset. Comments?

-ben

===== fs/Makefile 1.15 vs 1.16 =====
--- 1.15/fs/Makefile Wed Jan 30 02:21:55 2002
+++ 1.16/fs/Makefile Fri Feb 8 14:57:54 2002
@@ -22,6 +22,7 @@
obj-y += noquot.o
endif

+export-objs += aio.o
obj-y += aio.o

subdir-$(CONFIG_PROC_FS) += proc
===== fs/buffer.c 1.60 vs 1.61 =====
--- 1.60/fs/buffer.c Tue Jan 15 05:53:34 2002
+++ 1.61/fs/buffer.c Fri Feb 8 17:22:14 2002
@@ -54,6 +54,8 @@
#include <asm/bitops.h>
#include <asm/mmu_context.h>

+extern struct bio *bio_setup_from_kvec(int gfp_mask, struct kvec *kvec);
+
#define MAX_BUF_PER_PAGE (PAGE_CACHE_SIZE / 512)
#define NR_RESERVED (10*MAX_BUF_PER_PAGE)
#define MAX_UNUSED_BUFFERS NR_RESERVED+20 /* don't ever have more than this
@@ -2764,16 +2766,26 @@
* It is up to the caller to make sure that there are enough blocks
* passed in to completely map the iobufs to disk.
*/
+static int brw_kvec_end_io(struct bio *bio, int nr_sectors)
+{
+ kvec_cb_t cb = bio->cb;
+ int res = nr_sectors * 512;
+ if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+ res = -EIO;
+ bio_put(bio);
+ cb.fn(cb.data, cb.vec, res);
+ return 0;
+}

-int brw_kvec_async(int rw, kvec_cb_t cb, kdev_t dev, unsigned blocks, unsigned long blknr, int sector_shift)
+int brw_kvec_async(int rw, kvec_cb_t cb, kdev_t dev, unsigned blocks, sector_t blknr, int sector_shift)
{
struct kvec *vec = cb.vec;
struct kveclet *veclet;
- int err;
int length;
unsigned sector_size = 1 << sector_shift;
int i;

+ struct bio *bio;
struct brw_cb *brw_cb;

if (!vec->nr)
@@ -2795,125 +2807,21 @@
if (length < (blocks << sector_shift))
BUG();

- /*
- * OK to walk down the iovec doing page IO on each page we find.
- */
- err = 0;
-
if (!blocks) {
printk("brw_kiovec_async: !i\n");
return -EINVAL;
}

- /* FIXME: tie into userbeans here */
- brw_cb = kmalloc(sizeof(*brw_cb) + (blocks * sizeof(struct buffer_head *)), GFP_KERNEL);
- if (!brw_cb)
+ bio = bio_setup_from_kvec(GFP_KERNEL, vec);
+ if (unlikely(!bio))
return -ENOMEM;
-
- brw_cb->cb = cb;
- brw_cb->nr = 0;
-
- /* This is ugly. FIXME. */
- for (i=0, veclet=vec->veclet; i<vec->nr; i++,veclet++) {
- struct page *page = veclet->page;
- unsigned offset = veclet->offset;
- unsigned length = veclet->length;
-
- if (!page)
- BUG();
-
- while (length > 0) {
- struct buffer_head *tmp;
- tmp = kmem_cache_alloc(bh_cachep, GFP_NOIO);
- err = -ENOMEM;
- if (!tmp)
- goto error;
-
- tmp->b_dev = B_FREE;
- tmp->b_size = sector_size;
- set_bh_page(tmp, page, offset);
- tmp->b_this_page = tmp;
-
- init_buffer(tmp, end_buffer_io_kiobuf_async, NULL);
- tmp->b_dev = dev;
- tmp->b_blocknr = blknr++;
- tmp->b_state = (1 << BH_Mapped) | (1 << BH_Lock)
- | (1 << BH_Req);
- tmp->b_private = brw_cb;
-
- if (rw == WRITE) {
- set_bit(BH_Uptodate, &tmp->b_state);
- clear_bit(BH_Dirty, &tmp->b_state);
- }
-
- brw_cb->bh[brw_cb->nr++] = tmp;
- length -= sector_size;
- offset += sector_size;
-
- if (offset >= PAGE_SIZE) {
- offset = 0;
- break;
- }
-
- if (brw_cb->nr >= blocks)
- goto submit;
- } /* End of block loop */
- } /* End of page loop */
-
-submit:
- atomic_set(&brw_cb->io_count, brw_cb->nr+1);
- /* okay, we've setup all our io requests, now fire them off! */
- for (i=0; i<brw_cb->nr; i++)
- submit_bh(rw, brw_cb->bh[i]);
- brw_cb_put(brw_cb);
+ bio->cb = cb;
+ bio->bi_sector = blknr;
+ bio->bi_dev = dev;
+ bio->bi_vcnt = vec->nr;
+ bio->bi_size = length;
+ bio->bi_end_io = brw_kvec_end_io;
+ submit_bio(rw, bio);

return 0;
-
-error:
- /* Walk brw_cb_table freeing all the goop associated with each kiobuf */
- if (brw_cb) {
- /* We got an error allocating the bh'es. Just free the current
- buffer_heads and exit. */
- for (i=0; i<brw_cb->nr; i++)
- kmem_cache_free(bh_cachep, brw_cb->bh[i]);
- kfree(brw_cb);
- }
-
- return err;
-}
-#if 0
-int brw_kiovec(int rw, int nr, struct kiobuf *iovec[],
- kdev_t dev, int nr_blocks, unsigned long b[], int sector_size)
-{
- int i;
- int transferred = 0;
- int err = 0;
-
- if (!nr)
- return 0;
-
- /* queue up and trigger the io */
- err = brw_kiovec_async(rw, nr, iovec, dev, nr_blocks, b, sector_size);
- if (err)
- goto out;
-
- /* wait on the last iovec first -- it's more likely to finish last */
- for (i=nr; --i >= 0; )
- kiobuf_wait_for_io(iovec[i]);
-
- run_task_queue(&tq_disk);
-
- /* okay, how much data actually got through? */
- for (i=0; i<nr; i++) {
- if (iovec[i]->errno) {
- if (!err)
- err = iovec[i]->errno;
- break;
- }
- transferred += iovec[i]->length;
- }
-
-out:
- return transferred ? transferred : err;
}
-#endif
===== fs/bio.c 1.14 vs 1.15 =====
--- 1.14/fs/bio.c Thu Feb 7 16:13:25 2002
+++ 1.15/fs/bio.c Fri Feb 8 17:22:14 2002
@@ -151,6 +151,22 @@
return NULL;
}

+struct bio *bio_setup_from_kvec(int gfp_mask, struct kvec *kvec)
+{
+ struct bio *bio = mempool_alloc(bio_pool, gfp_mask);
+ struct bio_vec *bvl = NULL;
+
+ if (unlikely(!bio))
+ return NULL;
+
+ bio->bi_max = kvec->max_nr;
+ bio_init(bio);
+ bio->bi_destructor = bio_destructor;
+ bio->bi_io_vec = (struct bio_vec *)kvec->veclet; /* shoot me */
+ bio->bi_flags |= 1 << BIO_CLONED; /* don't free the vec */
+ return bio;
+}
+
/**
* bio_put - release a reference to a bio
* @bio: bio to release reference to
===== include/linux/kiovec.h 1.1 vs 1.2 =====
--- 1.1/include/linux/kiovec.h Sat Jan 12 02:19:10 2002
+++ 1.2/include/linux/kiovec.h Fri Feb 8 15:00:54 2002
@@ -6,8 +6,8 @@

struct kveclet {
struct page *page;
- unsigned offset;
unsigned length;
+ unsigned offset;
};

struct kvec {
===== include/linux/bio.h 1.11 vs 1.12 =====
--- 1.11/include/linux/bio.h Wed Feb 6 01:23:04 2002
+++ 1.12/include/linux/bio.h Fri Feb 8 17:22:23 2002
@@ -26,6 +26,8 @@
#define BIO_VMERGE_BOUNDARY 0
#endif

+#include <linux/kiovec.h>
+
#define BIO_DEBUG

#ifdef BIO_DEBUG
@@ -91,6 +93,7 @@
void *bi_private;

bio_destructor_t *bi_destructor; /* destructor */
+ kvec_cb_t cb;
};

/*
===== fs/aio.c 1.1 vs 1.2 =====
--- 1.1/fs/aio.c Wed Jan 30 13:12:34 2002
+++ 1.2/fs/aio.c Fri Feb 8 14:58:10 2002
@@ -37,6 +37,7 @@
#include <linux/smp_lock.h>
#include <linux/compiler.h>
#include <linux/poll.h>
+#include <linux/module.h>

#include <asm/uaccess.h>

@@ -964,3 +965,8 @@
}

__initcall(aio_setup);
+EXPORT_SYMBOL_GPL(generic_file_kvec_read);
+EXPORT_SYMBOL_GPL(generic_file_aio_read);
+EXPORT_SYMBOL_GPL(generic_file_kvec_write);
+EXPORT_SYMBOL_GPL(generic_file_aio_write);
+EXPORT_SYMBOL_GPL(generic_file_new_read);
-
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