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Commit 73a7075e authored by Kent Overstreet's avatar Kent Overstreet Committed by Benjamin LaHaise
Browse files

aio: Kill aio_rw_vect_retry() 



This code doesn't serve any purpose anymore, since the aio retry
infrastructure has been removed.

This change should be safe because aio_read/write are also used for
synchronous IO, and called from do_sync_read()/do_sync_write() - and
there's no looping done in the sync case (the read and write syscalls).

Signed-off-by: default avatarKent Overstreet <koverstreet@google.com>
Cc: Zach Brown <zab@redhat.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Asai Thambi S P <asamymuthupa@micron.com>
Cc: Selvan Mani <smani@micron.com>
Cc: Sam Bradshaw <sbradshaw@micron.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: default avatarBenjamin LaHaise <bcrl@kvack.org>
parent 5ffac122

drivers/staging/android/logger.c

+1 −1
Original line number Diff line number Diff line
@@ -481,7 +481,7 @@ static ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov, 
	header.sec = now.tv_sec;

	header.nsec = now.tv_nsec;

	header.euid = current_euid();

	header.len = min_t(size_t, iocb->ki_left, LOGGER_ENTRY_MAX_PAYLOAD);

	header.len = min_t(size_t, iocb->ki_nbytes, LOGGER_ENTRY_MAX_PAYLOAD);

	header.hdr_size = sizeof(struct logger_entry);



	/* null writes succeed, return zero */

drivers/usb/gadget/inode.c

+3 −3
Original line number Diff line number Diff line
@@ -708,11 +708,11 @@ ep_aio_read(struct kiocb *iocb, const struct iovec *iov, 
	if (unlikely(usb_endpoint_dir_in(&epdata->desc)))

		return -EINVAL;



	buf = kmalloc(iocb->ki_left, GFP_KERNEL);

	buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL);

	if (unlikely(!buf))

		return -ENOMEM;



	return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);

	return ep_aio_rwtail(iocb, buf, iocb->ki_nbytes, epdata, iov, nr_segs);

}



static ssize_t
@@ -727,7 +727,7 @@ ep_aio_write(struct kiocb *iocb, const struct iovec *iov, 
	if (unlikely(!usb_endpoint_dir_in(&epdata->desc)))

		return -EINVAL;



	buf = kmalloc(iocb->ki_left, GFP_KERNEL);

	buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL);

	if (unlikely(!buf))

		return -ENOMEM;

fs/aio.c

+18 −73
Original line number Diff line number Diff line
@@ -707,7 +707,7 @@ static inline struct kiocb *aio_get_req(struct kioctx *ctx) 
	if (unlikely(!req))

		goto out_put;



	atomic_set(&req->ki_users, 2);

	atomic_set(&req->ki_users, 1);

	req->ki_ctx = ctx;

	return req;

out_put:
@@ -1051,75 +1051,9 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx) 
	return -EINVAL;

}



static void aio_advance_iovec(struct kiocb *iocb, ssize_t ret)

{

	struct iovec *iov = &iocb->ki_iovec[iocb->ki_cur_seg];



	BUG_ON(ret <= 0);



	while (iocb->ki_cur_seg < iocb->ki_nr_segs && ret > 0) {

		ssize_t this = min((ssize_t)iov->iov_len, ret);

		iov->iov_base += this;

		iov->iov_len -= this;

		iocb->ki_left -= this;

		ret -= this;

		if (iov->iov_len == 0) {

			iocb->ki_cur_seg++;

			iov++;

		}

	}



	/* the caller should not have done more io than what fit in

	 * the remaining iovecs */

	BUG_ON(ret > 0 && iocb->ki_left == 0);

}



typedef ssize_t (aio_rw_op)(struct kiocb *, const struct iovec *,

			    unsigned long, loff_t);



static ssize_t aio_rw_vect_retry(struct kiocb *iocb, int rw, aio_rw_op *rw_op)

{

	struct file *file = iocb->ki_filp;

	struct address_space *mapping = file->f_mapping;

	struct inode *inode = mapping->host;

	ssize_t ret = 0;



	/* This matches the pread()/pwrite() logic */

	if (iocb->ki_pos < 0)

		return -EINVAL;



	if (rw == WRITE)

		file_start_write(file);

	do {

		ret = rw_op(iocb, &iocb->ki_iovec[iocb->ki_cur_seg],

			    iocb->ki_nr_segs - iocb->ki_cur_seg,

			    iocb->ki_pos);

		if (ret > 0)

			aio_advance_iovec(iocb, ret);



	/* retry all partial writes.  retry partial reads as long as its a

	 * regular file. */

	} while (ret > 0 && iocb->ki_left > 0 &&

		 (rw == WRITE ||

		  (!S_ISFIFO(inode->i_mode) && !S_ISSOCK(inode->i_mode))));

	if (rw == WRITE)

		file_end_write(file);



	/* This means we must have transferred all that we could */

	/* No need to retry anymore */

	if ((ret == 0) || (iocb->ki_left == 0))

		ret = iocb->ki_nbytes - iocb->ki_left;



	/* If we managed to write some out we return that, rather than

	 * the eventual error. */

	if (rw == WRITE

	    && ret < 0 && ret != -EIOCBQUEUED

	    && iocb->ki_nbytes - iocb->ki_left)

		ret = iocb->ki_nbytes - iocb->ki_left;



	return ret;

}



static ssize_t aio_setup_vectored_rw(int rw, struct kiocb *kiocb, bool compat)

{

	ssize_t ret;
@@ -1204,9 +1138,22 @@ rw_common: 
			return ret;



		req->ki_nbytes = ret;

		req->ki_left = ret;



		ret = aio_rw_vect_retry(req, rw, rw_op);

		/* XXX: move/kill - rw_verify_area()? */

		/* This matches the pread()/pwrite() logic */

		if (req->ki_pos < 0) {

			ret = -EINVAL;

			break;

		}



		if (rw == WRITE)

			file_start_write(file);



		ret = rw_op(req, req->ki_iovec,

			    req->ki_nr_segs, req->ki_pos);



		if (rw == WRITE)

			file_end_write(file);

		break;



	case IOCB_CMD_FDSYNC:
@@ -1301,19 +1248,17 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, 
	req->ki_pos = iocb->aio_offset;



	req->ki_buf = (char __user *)(unsigned long)iocb->aio_buf;

	req->ki_left = req->ki_nbytes = iocb->aio_nbytes;

	req->ki_nbytes = iocb->aio_nbytes;

	req->ki_opcode = iocb->aio_lio_opcode;



	ret = aio_run_iocb(req, compat);

	if (ret)

		goto out_put_req;



	aio_put_req(req);	/* drop extra ref to req */

	return 0;

out_put_req:

	put_reqs_available(ctx, 1);

	aio_put_req(req);	/* drop extra ref to req */

	aio_put_req(req);	/* drop i/o ref to req */

	aio_put_req(req);

	return ret;

}

fs/block_dev.c

+1 −1
Original line number Diff line number Diff line
@@ -1542,7 +1542,7 @@ static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov, 
		return 0;



	size -= pos;

	if (size < iocb->ki_left)

	if (size < iocb->ki_nbytes)

		nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size);

	return generic_file_aio_read(iocb, iov, nr_segs, pos);

}

fs/nfs/direct.c

+0 −1
Original line number Diff line number Diff line
@@ -130,7 +130,6 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_ 


	return -EINVAL;

#else

	VM_BUG_ON(iocb->ki_left != PAGE_SIZE);

	VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE);



	if (rw == READ || rw == KERNEL_READ)