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direct-io: move aio_complete into ->end_io

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Filesystems with unwritten extent support must not complete an AIO request
until the transaction to convert the extent has been commited.  That means
the aio_complete calls needs to be moved into the ->end_io callback so
that the filesystem can control when to call it exactly.

This makes a bit of a mess out of dio_complete and the ->end_io callback
prototype even more complicated.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
2010-07-18 21:17:09 +00:00
committed by Alex Elder
parent 696123fca8
commit 40e2e97316
6 changed files with 37 additions and 18 deletions
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26
fs/direct-io.c
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@@ -218,7 +218,7 @@ static struct page *dio_get_page(struct dio *dio)
* filesystems can use it to hold additional state between get_block calls and
* dio_complete.
*/
static int dio_complete(struct dio *dio, loff_t offset, int ret)
static int dio_complete(struct dio *dio, loff_t offset, int ret, bool is_async)
{
ssize_t transferred = 0;
@@ -239,14 +239,6 @@ static int dio_complete(struct dio *dio, loff_t offset, int ret)
transferred = dio->i_size - offset;
}
if (dio->end_io && dio->result)
dio->end_io(dio->iocb, offset, transferred,
dio->map_bh.b_private);
if (dio->flags & DIO_LOCKING)
/* lockdep: non-owner release */
up_read_non_owner(&dio->inode->i_alloc_sem);
if (ret == 0)
ret = dio->page_errors;
if (ret == 0)
@@ -254,6 +246,17 @@ static int dio_complete(struct dio *dio, loff_t offset, int ret)
if (ret == 0)
ret = transferred;
if (dio->end_io && dio->result) {
dio->end_io(dio->iocb, offset, transferred,
dio->map_bh.b_private, ret, is_async);
} else if (is_async) {
aio_complete(dio->iocb, ret, 0);
}
if (dio->flags & DIO_LOCKING)
/* lockdep: non-owner release */
up_read_non_owner(&dio->inode->i_alloc_sem);
return ret;
}
@@ -277,8 +280,7 @@ static void dio_bio_end_aio(struct bio *bio, int error)
spin_unlock_irqrestore(&dio->bio_lock, flags);
if (remaining == 0) {
int ret = dio_complete(dio, dio->iocb->ki_pos, 0);
aio_complete(dio->iocb, ret, 0);
dio_complete(dio, dio->iocb->ki_pos, 0, true);
kfree(dio);
}
}
@@ -1126,7 +1128,7 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
spin_unlock_irqrestore(&dio->bio_lock, flags);
if (ret2 == 0) {
ret = dio_complete(dio, offset, ret);
ret = dio_complete(dio, offset, ret, false);
kfree(dio);
} else
BUG_ON(ret != -EIOCBQUEUED);