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: Kent 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: Benjamin LaHaise <bcrl@kvack.org>
diff --git a/fs/aio.c b/fs/aio.c
index 57b0279..d00904d 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -707,7 +707,7 @@
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 @@
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 @@
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 @@
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;
}
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c7bda5c..8772b15 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1542,7 +1542,7 @@
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);
}
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 0bd7a55..91ff089 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -130,7 +130,6 @@
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)
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 41000f2..dd1a490 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2245,7 +2245,7 @@
file->f_path.dentry->d_name.name,
(unsigned int)nr_segs);
- if (iocb->ki_left == 0)
+ if (iocb->ki_nbytes == 0)
return 0;
appending = file->f_flags & O_APPEND ? 1 : 0;
@@ -2296,7 +2296,7 @@
can_do_direct = direct_io;
ret = ocfs2_prepare_inode_for_write(file, ppos,
- iocb->ki_left, appending,
+ iocb->ki_nbytes, appending,
&can_do_direct, &has_refcount);
if (ret < 0) {
mlog_errno(ret);
@@ -2304,7 +2304,7 @@
}
if (direct_io && !is_sync_kiocb(iocb))
- unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left,
+ unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_nbytes,
*ppos);
/*
diff --git a/fs/read_write.c b/fs/read_write.c
index 122a384..e3cd280 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -367,7 +367,6 @@
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
- kiocb.ki_left = len;
kiocb.ki_nbytes = len;
ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
@@ -417,7 +416,6 @@
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
- kiocb.ki_left = len;
kiocb.ki_nbytes = len;
ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
@@ -599,7 +597,6 @@
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
- kiocb.ki_left = len;
kiocb.ki_nbytes = len;
ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 29569dd..c02a27a 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -141,7 +141,7 @@
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
int err, pos;
- size_t count = iocb->ki_left;
+ size_t count = iocb->ki_nbytes;
struct udf_inode_info *iinfo = UDF_I(inode);
down_write(&iinfo->i_data_sem);
