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Subject[take2 3/4] kevent: AIO, aio_sendfile() implementation.
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This patch includes asynchronous propagation of file's data into VFS
cache and aio_sendfile() implementation.
Network aio_sendfile() works lazily - it asynchronously populates pages
into the VFS cache (which can be used for various tricks with adaptive
readahead) and then uses usual ->sendfile() callback.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

diff --git a/fs/bio.c b/fs/bio.c
index 6a0b9ad..a3ee530 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -119,7 +119,7 @@ void bio_free(struct bio *bio, struct bi
/*
* default destructor for a bio allocated with bio_alloc_bioset()
*/
-static void bio_fs_destructor(struct bio *bio)
+void bio_fs_destructor(struct bio *bio)
{
bio_free(bio, fs_bio_set);
}
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index fb4d322..9316551 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -685,6 +685,7 @@ ext2_writepages(struct address_space *ma
}

const struct address_space_operations ext2_aops = {
+ .get_block = ext2_get_block,
.readpage = ext2_readpage,
.readpages = ext2_readpages,
.writepage = ext2_writepage,
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index c5ee9f0..d9210d4 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1699,6 +1699,7 @@ static int ext3_journalled_set_page_dirt
}

static const struct address_space_operations ext3_ordered_aops = {
+ .get_block = ext3_get_block,
.readpage = ext3_readpage,
.readpages = ext3_readpages,
.writepage = ext3_ordered_writepage,
diff --git a/fs/file_table.c b/fs/file_table.c
index 0131ba0..b649317 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -112,6 +112,9 @@ struct file *get_empty_filp(void)
if (security_file_alloc(f))
goto fail_sec;

+#ifdef CONFIG_KEVENT_POLL
+ kevent_storage_init(f, &f->st);
+#endif
tsk = current;
INIT_LIST_HEAD(&f->f_u.fu_list);
atomic_set(&f->f_count, 1);
@@ -159,6 +162,9 @@ void fastcall __fput(struct file *file)
might_sleep();

fsnotify_close(file);
+#ifdef CONFIG_KEVENT_POLL
+ kevent_storage_fini(&file->st);
+#endif
/*
* The function eventpoll_release() should be the first called
* in the file cleanup chain.
diff --git a/fs/inode.c b/fs/inode.c
index 0bf9f04..fdbd0ba 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -21,6 +21,7 @@ #include <linux/pagemap.h>
#include <linux/cdev.h>
#include <linux/bootmem.h>
#include <linux/inotify.h>
+#include <linux/kevent.h>
#include <linux/mount.h>

/*
@@ -165,12 +166,18 @@ #endif
}
memset(&inode->u, 0, sizeof(inode->u));
inode->i_mapping = mapping;
+#if defined CONFIG_KEVENT
+ kevent_storage_init(inode, &inode->st);
+#endif
}
return inode;
}

void destroy_inode(struct inode *inode)
{
+#if defined CONFIG_KEVENT_INODE || defined CONFIG_KEVENT_SOCKET
+ kevent_storage_fini(&inode->st);
+#endif
BUG_ON(inode_has_buffers(inode));
security_inode_free(inode);
if (inode->i_sb->s_op->destroy_inode)
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 12dfdcf..f8dca72 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3001,6 +3001,7 @@ int reiserfs_setattr(struct dentry *dent
}

const struct address_space_operations reiserfs_address_space_operations = {
+ .get_block = reiserfs_get_block,
.writepage = reiserfs_writepage,
.readpage = reiserfs_readpage,
.readpages = reiserfs_readpages,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2561020..65eb438 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -240,6 +240,9 @@ #include <linux/mutex.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>
+#ifdef CONFIG_KEVENT
+#include <linux/kevent_storage.h>
+#endif

struct hd_geometry;
struct iovec;
@@ -352,6 +355,8 @@ struct address_space;
struct writeback_control;

struct address_space_operations {
+ int (*get_block)(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create);
int (*writepage)(struct page *page, struct writeback_control *wbc);
int (*readpage)(struct file *, struct page *);
void (*sync_page)(struct page *);
@@ -546,6 +551,10 @@ #ifdef CONFIG_INOTIFY
struct mutex inotify_mutex; /* protects the watches list */
#endif

+#ifdef CONFIG_KEVENT_INODE
+ struct kevent_storage st;
+#endif
+
unsigned long i_state;
unsigned long dirtied_when; /* jiffies of first dirtying */

@@ -698,6 +707,9 @@ #ifdef CONFIG_EPOLL
struct list_head f_ep_links;
spinlock_t f_ep_lock;
#endif /* #ifdef CONFIG_EPOLL */
+#ifdef CONFIG_KEVENT_POLL
+ struct kevent_storage st;
+#endif
struct address_space *f_mapping;
};
extern spinlock_t files_lock;
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index cc5dec7..0acc8db 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -15,6 +15,7 @@ #ifdef __KERNEL__

#include <linux/dnotify.h>
#include <linux/inotify.h>
+#include <linux/kevent.h>
#include <linux/audit.h>

/*
@@ -79,6 +80,7 @@ static inline void fsnotify_nameremove(s
isdir = IN_ISDIR;
dnotify_parent(dentry, DN_DELETE);
inotify_dentry_parent_queue_event(dentry, IN_DELETE|isdir, 0, dentry->d_name.name);
+ kevent_inode_notify_parent(dentry, KEVENT_INODE_REMOVE);
}

/*
@@ -88,6 +90,7 @@ static inline void fsnotify_inoderemove(
{
inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
inotify_inode_is_dead(inode);
+ kevent_inode_remove(inode);
}

/*
@@ -96,6 +99,7 @@ static inline void fsnotify_inoderemove(
static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
{
inode_dir_notify(inode, DN_CREATE);
+ kevent_inode_notify(inode, KEVENT_INODE_CREATE);
inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
dentry->d_inode);
audit_inode_child(dentry->d_name.name, dentry->d_inode, inode->i_ino);
@@ -107,6 +111,7 @@ static inline void fsnotify_create(struc
static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
{
inode_dir_notify(inode, DN_CREATE);
+ kevent_inode_notify(inode, KEVENT_INODE_CREATE);
inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0,
dentry->d_name.name, dentry->d_inode);
audit_inode_child(dentry->d_name.name, dentry->d_inode, inode->i_ino);
diff --git a/kernel/kevent/kevent_aio.c b/kernel/kevent/kevent_aio.c
new file mode 100644
index 0000000..fa07a19
--- /dev/null
+++ b/kernel/kevent/kevent_aio.c
@@ -0,0 +1,580 @@
+/*
+ * kevent_aio.c
+ *
+ * 2006 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/swap.h>
+#include <linux/pagemap.h>
+#include <linux/bio.h>
+#include <linux/buffer_head.h>
+#include <linux/kevent.h>
+
+#include <net/sock.h>
+
+#define KEVENT_AIO_DEBUG
+
+#ifdef KEVENT_AIO_DEBUG
+#define dprintk(f, a...) printk(f, ##a)
+#else
+#define dprintk(f, a...) do {} while (0)
+#endif
+
+struct kevent_aio_private
+{
+ int pg_num;
+ size_t size;
+ loff_t offset;
+ loff_t processed;
+ atomic_t bio_page_num;
+ struct completion bio_complete;
+ struct file *file, *sock;
+ struct work_struct work;
+};
+
+static int kevent_aio_dequeue(struct kevent *k);
+static int kevent_aio_enqueue(struct kevent *k);
+static int kevent_aio_callback(struct kevent *k);
+
+extern void bio_fs_destructor(struct bio *bio);
+
+static void kevent_aio_bio_destructor(struct bio *bio)
+{
+ struct kevent *k = bio->bi_private;
+ struct kevent_aio_private *priv = k->priv;
+
+ dprintk("%s: bio=%p, num=%u, k=%p, inode=%p.\n", __func__, bio, bio->bi_vcnt, k, k->st->origin);
+ schedule_work(&priv->work);
+ bio_fs_destructor(bio);
+}
+
+static void kevent_aio_bio_put(struct kevent *k)
+{
+ struct kevent_aio_private *priv = k->priv;
+
+ if (atomic_dec_and_test(&priv->bio_page_num))
+ complete(&priv->bio_complete);
+}
+
+static int kevent_mpage_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
+{
+ const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
+ struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct kevent *k = bio->bi_private;
+
+ if (bio->bi_size)
+ return 1;
+
+ do {
+ struct page *page = bvec->bv_page;
+
+ if (--bvec >= bio->bi_io_vec)
+ prefetchw(&bvec->bv_page->flags);
+
+ if (uptodate) {
+ SetPageUptodate(page);
+ } else {
+ ClearPageUptodate(page);
+ SetPageError(page);
+ }
+
+ unlock_page(page);
+ kevent_aio_bio_put(k);
+ } while (bvec >= bio->bi_io_vec);
+
+ bio_put(bio);
+ return 0;
+}
+
+static inline struct bio *kevent_mpage_bio_submit(int rw, struct bio *bio)
+{
+ if (bio) {
+ bio->bi_end_io = kevent_mpage_end_io_read;
+ dprintk("%s: bio=%p, num=%u.\n", __func__, bio, bio->bi_vcnt);
+ submit_bio(READ, bio);
+ }
+ return NULL;
+}
+
+static struct bio *kevent_mpage_readpage(struct kevent *k, struct bio *bio,
+ struct page *page, unsigned nr_pages, get_block_t get_block,
+ loff_t *offset, sector_t *last_block_in_bio)
+{
+ struct inode *inode = k->st->origin;
+ const unsigned blkbits = inode->i_blkbits;
+ const unsigned blocks_per_page = PAGE_CACHE_SIZE >> blkbits;
+ const unsigned blocksize = 1 << blkbits;
+ sector_t block_in_file;
+ sector_t last_block;
+ struct block_device *bdev = NULL;
+ unsigned first_hole = blocks_per_page;
+ unsigned page_block;
+ sector_t blocks[MAX_BUF_PER_PAGE];
+ struct buffer_head bh;
+ int fully_mapped = 1, length;
+
+ block_in_file = (*offset + blocksize - 1) >> blkbits;
+ last_block = (i_size_read(inode) + blocksize - 1) >> blkbits;
+
+ bh.b_page = page;
+ for (page_block = 0; page_block < blocks_per_page; page_block++, block_in_file++) {
+ bh.b_state = 0;
+ if (block_in_file < last_block) {
+ if (get_block(inode, block_in_file, &bh, 0))
+ goto confused;
+ }
+
+ if (!buffer_mapped(&bh)) {
+ fully_mapped = 0;
+ if (first_hole == blocks_per_page)
+ first_hole = page_block;
+ continue;
+ }
+
+ /* some filesystems will copy data into the page during
+ * the get_block call, in which case we don't want to
+ * read it again. map_buffer_to_page copies the data
+ * we just collected from get_block into the page's buffers
+ * so readpage doesn't have to repeat the get_block call
+ */
+ if (buffer_uptodate(&bh)) {
+ BUG();
+ //map_buffer_to_page(page, &bh, page_block);
+ goto confused;
+ }
+
+ if (first_hole != blocks_per_page)
+ goto confused; /* hole -> non-hole */
+
+ /* Contiguous blocks? */
+ if (page_block && blocks[page_block-1] != bh.b_blocknr-1)
+ goto confused;
+ blocks[page_block] = bh.b_blocknr;
+ bdev = bh.b_bdev;
+ }
+
+ if (!bdev)
+ goto confused;
+
+ if (first_hole != blocks_per_page) {
+ char *kaddr = kmap_atomic(page, KM_USER0);
+ memset(kaddr + (first_hole << blkbits), 0,
+ PAGE_CACHE_SIZE - (first_hole << blkbits));
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+ if (first_hole == 0) {
+ SetPageUptodate(page);
+ goto out;
+ }
+ } else if (fully_mapped) {
+ SetPageMappedToDisk(page);
+ }
+
+ /*
+ * This page will go to BIO. Do we need to send this BIO off first?
+ */
+ if (bio && (*last_block_in_bio != blocks[0] - 1))
+ bio = kevent_mpage_bio_submit(READ, bio);
+
+alloc_new:
+ if (bio == NULL) {
+ nr_pages = min_t(unsigned, nr_pages, bio_get_nr_vecs(bdev));
+ bio = bio_alloc(GFP_KERNEL, nr_pages);
+ if (bio == NULL)
+ goto confused;
+
+ bio->bi_destructor = kevent_aio_bio_destructor;
+ bio->bi_bdev = bdev;
+ bio->bi_sector = blocks[0] << (blkbits - 9);
+ bio->bi_private = k;
+ }
+
+ length = first_hole << blkbits;
+ if (bio_add_page(bio, page, length, 0) < length) {
+ bio = kevent_mpage_bio_submit(READ, bio);
+ dprintk("%s: Failed to add a page: nr_pages=%d, length=%d, page=%p.\n",
+ __func__, nr_pages, length, page);
+ goto alloc_new;
+ }
+
+ dprintk("%s: bio=%p, b=%d, m=%d, u=%d, nr_pages=%d, offset=%Lu, "
+ "size=%Lu. page_block=%u, page=%p.\n",
+ __func__, bio, buffer_boundary(&bh), buffer_mapped(&bh),
+ buffer_uptodate(&bh), nr_pages, *offset, i_size_read(inode),
+ page_block, page);
+
+ *offset = *offset + length;
+
+ if (buffer_boundary(&bh) || (first_hole != blocks_per_page))
+ bio = kevent_mpage_bio_submit(READ, bio);
+ else
+ *last_block_in_bio = blocks[blocks_per_page - 1];
+
+out:
+ return bio;
+
+confused:
+ dprintk("%s: confused. bio=%p, nr_pages=%d.\n", __func__, bio, nr_pages);
+ if (bio)
+ bio = kevent_mpage_bio_submit(READ, bio);
+ kevent_aio_bio_put(k);
+ SetPageUptodate(page);
+
+ if (nr_pages == 1) {
+ struct kevent_aio_private *priv = k->priv;
+
+ wait_for_completion(&priv->bio_complete);
+ kevent_storage_ready(k->st, NULL, KEVENT_AIO_BIO);
+ init_completion(&priv->bio_complete);
+ complete(&priv->bio_complete);
+ }
+ goto out;
+}
+
+static int kevent_aio_alloc_cached_page(struct kevent *k, struct page **cached_page)
+{
+ struct kevent_aio_private *priv = k->priv;
+ struct address_space *mapping = priv->file->f_mapping;
+ struct page *page;
+ int err = 0;
+ pgoff_t index = priv->offset >> PAGE_CACHE_SHIFT;
+
+ page = page_cache_alloc_cold(mapping);
+ if (!page) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = add_to_page_cache_lru(page, mapping, index, GFP_KERNEL);
+ if (err) {
+ if (err == -EEXIST)
+ err = 0;
+ page_cache_release(page);
+ goto out;
+ }
+
+ dprintk("%s: page=%p, offset=%Lu, processed=%Lu, index=%lu, size=%zu.\n",
+ __func__, page, priv->offset, priv->processed, index, priv->size);
+
+ *cached_page = page;
+
+out:
+ return err;
+}
+
+static int kevent_mpage_readpages(struct kevent *k, int first,
+ int (* get_block)(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create))
+{
+ struct bio *bio = NULL;
+ struct kevent_aio_private *priv = k->priv;
+ sector_t last_block_in_bio = 0;
+ int i, err = 0;
+
+ atomic_set(&priv->bio_page_num, priv->pg_num);
+
+ for (i=first; i<priv->pg_num; ++i) {
+ struct page *page = NULL;
+
+ err = kevent_aio_alloc_cached_page(k, &page);
+ if (err)
+ break;
+
+ /*
+ * If there is no error and page is NULL, this means
+ * that someone added a page into VFS cache.
+ * We will not process this page, since it is that who
+ * added a page must read data from disk.
+ */
+ if (!page)
+ continue;
+
+ bio = kevent_mpage_readpage(k, bio, page, priv->pg_num - i,
+ get_block, &priv->offset, &last_block_in_bio);
+ }
+
+ if (bio)
+ bio = kevent_mpage_bio_submit(READ, bio);
+
+ return err;
+}
+
+static size_t kevent_aio_vfs_read_actor(struct kevent *k, struct page *kpage, size_t len)
+{
+ struct kevent_aio_private *priv = k->priv;
+ size_t ret;
+
+ ret = priv->sock->f_op->sendpage(priv->sock, kpage, 0, len, &priv->sock->f_pos, 1);
+
+ dprintk("%s: k=%p, page=%p, len=%zu, ret=%zd.\n",
+ __func__, k, kpage, len, ret);
+
+ return ret;
+}
+
+static int kevent_aio_vfs_read(struct kevent *k,
+ size_t (*actor)(struct kevent *, struct page *, size_t))
+{
+ struct kevent_aio_private *priv = k->priv;
+ struct address_space *mapping;
+ size_t isize, actor_size;
+ int i;
+
+ mapping = priv->file->f_mapping;
+ isize = i_size_read(priv->file->f_dentry->d_inode);
+
+ dprintk("%s: start: size_left=%zd, offset=%Lu, processed=%Lu, isize=%zu, pg_num=%d.\n",
+ __func__, priv->size, priv->offset, priv->processed, isize, priv->pg_num);
+
+ for (i=0; i<priv->pg_num && priv->size; ++i) {
+ struct page *page;
+ size_t nr = PAGE_CACHE_SIZE;
+
+ cond_resched();
+ page = find_get_page(mapping, priv->processed >> PAGE_CACHE_SHIFT);
+ if (unlikely(page == NULL))
+ break;
+ if (!PageUptodate(page)) {
+ dprintk("%s: %2d: page=%p, processed=%Lu, size=%zu not uptodate.\n",
+ __func__, i, page, priv->processed, priv->size);
+ page_cache_release(page);
+ break;
+ }
+
+ if (mapping_writably_mapped(mapping))
+ flush_dcache_page(page);
+
+ mark_page_accessed(page);
+
+ if (nr + priv->processed > isize)
+ nr = isize - priv->processed;
+ if (nr > priv->size)
+ nr = priv->size;
+
+ actor_size = actor(k, page, nr);
+ if (actor_size < 0) {
+ page_cache_release(page);
+ break;
+ }
+
+ page_cache_release(page);
+
+ priv->processed += actor_size;
+ priv->size -= actor_size;
+ }
+
+ if (!priv->size)
+ i = priv->pg_num;
+
+ if (i != priv->pg_num)
+ priv->offset = priv->processed;
+
+ dprintk("%s: end: next=%d, num=%d, left=%zu, offset=%Lu, procesed=%Lu, ret=%d.\n",
+ __func__, i, priv->pg_num,
+ priv->size, priv->offset, priv->processed, i);
+
+ return i;
+}
+
+static int kevent_aio_callback(struct kevent *k)
+{
+ return 1;
+}
+
+static void kevent_aio_work(void *data)
+{
+ struct kevent *k = data;
+ struct kevent_aio_private *priv = k->priv;
+ struct inode *inode = k->st->origin;
+ struct address_space *mapping = priv->file->f_mapping;
+ int err, ready = 0, num;
+
+ dprintk("%s: k=%p, priv=%p, inode=%p.\n", __func__, k, priv, inode);
+
+ init_completion(&priv->bio_complete);
+
+ num = ready = kevent_aio_vfs_read(k, &kevent_aio_vfs_read_actor);
+ if (ready > 0 && ready != priv->pg_num)
+ ready = 0;
+
+ dprintk("%s: k=%p, ready=%d, size=%zd.\n", __func__, k, ready, priv->size);
+
+ if (!ready) {
+ err = kevent_mpage_readpages(k, num, mapping->a_ops->get_block);
+ if (err) {
+ dprintk("%s: kevent_mpage_readpages failed: err=%d, k=%p, size=%zd.\n",
+ __func__, err, k, priv->size);
+ kevent_break(k);
+ kevent_storage_ready(k->st, NULL, KEVENT_MASK_ALL);
+ }
+ } else {
+ dprintk("%s: next k=%p, size=%zd.\n", __func__, k, priv->size);
+
+ if (priv->size)
+ schedule_work(&priv->work);
+ else {
+ kevent_storage_ready(k->st, NULL, KEVENT_MASK_ALL);
+ }
+
+ complete(&priv->bio_complete);
+ }
+}
+
+static int kevent_aio_enqueue(struct kevent *k)
+{
+ int err;
+ struct file *file, *sock;
+ struct inode *inode;
+ struct kevent_aio_private *priv;
+ struct address_space *mapping;
+ int fd = k->event.id.raw[0];
+ int num = k->event.id.raw[1];
+ int s = k->event.ret_data[0];
+ size_t size;
+
+ err = -ENODEV;
+ file = fget(fd);
+ if (!file)
+ goto err_out_exit;
+
+ sock = fget(s);
+ if (!sock)
+ goto err_out_fput_file;
+
+ mapping = file->f_mapping;
+
+ err = -EINVAL;
+ if (!file->f_dentry || !file->f_dentry->d_inode || !mapping->a_ops->get_block)
+ goto err_out_fput;
+ if (!sock->f_dentry || !sock->f_dentry->d_inode)
+ goto err_out_fput;
+
+ inode = igrab(file->f_dentry->d_inode);
+ if (!inode)
+ goto err_out_fput;
+
+ size = i_size_read(inode);
+
+ num = (size > num << PAGE_SHIFT) ? num : (size >> PAGE_SHIFT);
+
+ err = -ENOMEM;
+ priv = kzalloc(sizeof(struct kevent_aio_private), GFP_KERNEL);
+ if (!priv)
+ goto err_out_iput;
+
+ priv->pg_num = num;
+ priv->size = size;
+ priv->offset = 0;
+ priv->file = file;
+ priv->sock = sock;
+ INIT_WORK(&priv->work, kevent_aio_work, k);
+ k->priv = priv;
+
+ dprintk("%s: read: k=%p, priv=%p, inode=%p, num=%u, size=%zu, off=%Lu.\n",
+ __func__, k, priv, inode, priv->pg_num, priv->size, priv->offset);
+
+ init_completion(&priv->bio_complete);
+ kevent_storage_enqueue(&inode->st, k);
+ schedule_work(&priv->work);
+
+ return 0;
+
+err_out_iput:
+ iput(inode);
+err_out_fput:
+ fput(sock);
+err_out_fput_file:
+ fput(file);
+err_out_exit:
+
+ return err;
+}
+
+static int kevent_aio_dequeue(struct kevent *k)
+{
+ struct kevent_aio_private *priv = k->priv;
+ struct inode *inode = k->st->origin;
+ struct file *file = priv->file;
+ struct file *sock = priv->sock;
+
+ kevent_storage_dequeue(k->st, k);
+ flush_scheduled_work();
+ wait_for_completion(&priv->bio_complete);
+
+ kfree(k->priv);
+ k->priv = NULL;
+ iput(inode);
+ fput(file);
+ fput(sock);
+
+ return 0;
+}
+
+asmlinkage long sys_aio_sendfile(int ctl_fd, int fd, int s,
+ size_t size, unsigned flags)
+{
+ struct ukevent ukread, uksend;
+ struct kevent_user *u;
+ struct file *file;
+ int err, fput_needed;
+ int num = (flags & 7)?(flags & 7):8;
+
+ memset(&ukread, 0, sizeof(struct ukevent));
+ memset(&uksend, 0, sizeof(struct ukevent));
+
+ ukread.type = KEVENT_AIO;
+ ukread.event = KEVENT_AIO_BIO;
+
+ ukread.id.raw[0] = fd;
+ ukread.id.raw[1] = num;
+ ukread.ret_data[0] = s;
+
+ dprintk("%s: fd=%d, s=%d, num=%d.\n", __func__, fd, s, num);
+
+ file = fget_light(ctl_fd, &fput_needed);
+ if (!file)
+ return -ENODEV;
+
+ u = file->private_data;
+ if (!u) {
+ err = -EINVAL;
+ goto err_out_fput;
+ }
+
+ err = kevent_user_add_ukevent(&ukread, u);
+ if (err < 0)
+ goto err_out_fput;
+
+err_out_fput:
+ fput_light(file, fput_needed);
+ return err;
+}
+
+int kevent_init_aio(struct kevent *k)
+{
+ k->enqueue = &kevent_aio_enqueue;
+ k->dequeue = &kevent_aio_dequeue;
+ k->callback = &kevent_aio_callback;
+ return 0;
+}
-
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