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Message-Id: <20070116015450.9764.38389.patchbomb.py@nate-64.agami.com>
Date: Mon, 15 Jan 2007 17:54:50 -0800
From: Nate Diller <nate@...mi.com>
To: Nate Diller <nate.diller@...il.com>, Andrew Morton <akpm@...l.org>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Trond Myklebust <trond.myklebust@....uio.no>,
Benjamin LaHaise <bcrl@...ck.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Suparna Bhattacharya <suparna@...ibm.com>,
Kenneth W Chen <kenneth.w.chen@...el.com>,
David Brownell <dbrownell@...rs.sourceforge.net>,
Christoph Hellwig <hch@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
netdev@...r.kernel.org, ocfs2-devel@....oracle.com,
linux-aio@...ck.org, xfs-masters@....sgi.com
Subject: [PATCH -mm 4/10][RFC] aio: convert aio_complete to file_endio_t
Define a new function typedef for I/O completion at the file/iovec level --
typedef void (file_endio_t)(void *endio_data, ssize_t count, int err);
and convert aio_complete and all its callers to this new prototype.
---
drivers/usb/gadget/inode.c | 24 +++++++-----------
fs/aio.c | 59 ++++++++++++++++++++++++---------------------
fs/block_dev.c | 8 +-----
fs/direct-io.c | 18 +++++--------
fs/nfs/direct.c | 9 ++----
include/linux/aio.h | 11 +++-----
include/linux/fs.h | 2 +
7 files changed, 61 insertions(+), 70 deletions(-)
---
diff -urpN -X dontdiff a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
--- a/drivers/usb/gadget/inode.c 2007-01-12 14:42:29.000000000 -0800
+++ b/drivers/usb/gadget/inode.c 2007-01-12 14:25:34.000000000 -0800
@@ -559,35 +559,32 @@ static int ep_aio_cancel(struct kiocb *i
return value;
}
-static ssize_t ep_aio_read_retry(struct kiocb *iocb)
+static int ep_aio_read_retry(struct kiocb *iocb)
{
struct kiocb_priv *priv = iocb->private;
- ssize_t len, total;
- int i;
+ ssize_t total;
+ int i, err = 0;
/* we "retry" to get the right mm context for this: */
/* copy stuff into user buffers */
total = priv->actual;
- len = 0;
for (i=0; i < priv->nr_segs; i++) {
ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
if (copy_to_user(priv->iv[i].iov_base, priv->buf, this)) {
- if (len == 0)
- len = -EFAULT;
+ err = -EFAULT;
break;
}
total -= this;
- len += this;
if (total == 0)
break;
}
kfree(priv->buf);
kfree(priv);
aio_put_req(iocb);
- return len;
+ return err;
}
static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
@@ -610,9 +607,7 @@ static void ep_aio_complete(struct usb_e
if (unlikely(kiocbIsCancelled(iocb)))
aio_put_req(iocb);
else
- aio_complete(iocb,
- req->actual ? req->actual : req->status,
- req->status);
+ aio_complete(iocb, req->actual, req->status);
} else {
/* retry() won't report both; so we hide some faults */
if (unlikely(0 != req->status))
@@ -702,16 +697,17 @@ ep_aio_read(struct kiocb *iocb, const st
{
struct ep_data *epdata = iocb->ki_filp->private_data;
char *buf;
+ size_t len = iov_length(iov, nr_segs);
if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN))
return -EINVAL;
- buf = kmalloc(iocb->ki_left, GFP_KERNEL);
+ buf = kmalloc(len, GFP_KERNEL);
if (unlikely(!buf))
return -ENOMEM;
iocb->ki_retry = ep_aio_read_retry;
- return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);
+ return ep_aio_rwtail(iocb, buf, len, epdata, iov, nr_segs);
}
static ssize_t
@@ -726,7 +722,7 @@ ep_aio_write(struct kiocb *iocb, const s
if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN)))
return -EINVAL;
- buf = kmalloc(iocb->ki_left, GFP_KERNEL);
+ buf = kmalloc(iov_length(iov, nr_segs), GFP_KERNEL);
if (unlikely(!buf))
return -ENOMEM;
diff -urpN -X dontdiff a/fs/aio.c b/fs/aio.c
--- a/fs/aio.c 2007-01-12 14:42:29.000000000 -0800
+++ b/fs/aio.c 2007-01-12 14:29:20.000000000 -0800
@@ -658,16 +658,16 @@ static inline int __queue_kicked_iocb(st
* simplifies the coding of individual aio operations as
* it avoids various potential races.
*/
-static ssize_t aio_run_iocb(struct kiocb *iocb)
+static void aio_run_iocb(struct kiocb *iocb)
{
struct kioctx *ctx = iocb->ki_ctx;
- ssize_t (*retry)(struct kiocb *);
+ int (*retry)(struct kiocb *);
wait_queue_t *io_wait = current->io_wait;
- ssize_t ret;
+ int err;
if (!(retry = iocb->ki_retry)) {
printk("aio_run_iocb: iocb->ki_retry = NULL\n");
- return 0;
+ return;
}
/*
@@ -702,8 +702,8 @@ static ssize_t aio_run_iocb(struct kiocb
/* Quit retrying if the i/o has been cancelled */
if (kiocbIsCancelled(iocb)) {
- ret = -EINTR;
- aio_complete(iocb, ret, 0);
+ err = -EINTR;
+ aio_complete(iocb, iocb->ki_nbytes - iocb->ki_left, err);
/* must not access the iocb after this */
goto out;
}
@@ -720,17 +720,17 @@ static ssize_t aio_run_iocb(struct kiocb
*/
BUG_ON(!is_sync_wait(current->io_wait));
current->io_wait = &iocb->ki_wait.wait;
- ret = retry(iocb);
+ err = retry(iocb);
current->io_wait = io_wait;
- if (ret != -EIOCBRETRY && ret != -EIOCBQUEUED) {
+ if (err != -EIOCBRETRY && err != -EIOCBQUEUED) {
BUG_ON(!list_empty(&iocb->ki_wait.wait.task_list));
- aio_complete(iocb, ret, 0);
+ aio_complete(iocb, iocb->ki_nbytes - iocb->ki_left, err);
}
out:
spin_lock_irq(&ctx->ctx_lock);
- if (-EIOCBRETRY == ret) {
+ if (-EIOCBRETRY == err) {
/*
* OK, now that we are done with this iteration
* and know that there is more left to go,
@@ -754,7 +754,6 @@ out:
aio_queue_work(ctx);
}
}
- return ret;
}
/*
@@ -918,19 +917,25 @@ EXPORT_SYMBOL(kick_iocb);
/* aio_complete
* Called when the io request on the given iocb is complete.
- * Returns true if this is the last user of the request. The
+ * Frees ioctx if this is the last user of the request. The
* only other user of the request can be the cancellation code.
*/
-int fastcall aio_complete(struct kiocb *iocb, long res, long res2)
+void fastcall aio_complete(void *endio_data, ssize_t count, int err)
{
+ struct kiocb *iocb = endio_data;
struct kioctx *ctx = iocb->ki_ctx;
struct aio_ring_info *info;
struct aio_ring *ring;
struct io_event *event;
unsigned long flags;
unsigned long tail;
+ long result;
int ret;
+ result = (long) err;
+ if (!result)
+ result = (long) count;
+
/*
* Special case handling for sync iocbs:
* - events go directly into the iocb for fast handling
@@ -940,10 +945,10 @@ int fastcall aio_complete(struct kiocb *
*/
if (is_sync_kiocb(iocb)) {
BUG_ON(iocb->ki_users != 1);
- iocb->ki_user_data = res;
+ iocb->ki_user_data = result;
iocb->ki_users = 0;
wake_up_process(iocb->ki_obj.tsk);
- return 1;
+ return;
}
info = &ctx->ring_info;
@@ -975,12 +980,12 @@ int fastcall aio_complete(struct kiocb *
event->obj = (u64)(unsigned long)iocb->ki_obj.user;
event->data = iocb->ki_user_data;
- event->res = res;
- event->res2 = res2;
+ event->res = result;
+ event->res2 = err;
dprintk("aio_complete: %p[%lu]: %p: %p %Lx %lx %lx\n",
ctx, tail, iocb, iocb->ki_obj.user, iocb->ki_user_data,
- res, res2);
+ result, err);
/* after flagging the request as done, we
* must never even look at it again
@@ -1002,7 +1007,7 @@ put_rq:
wake_up(&ctx->wait);
spin_unlock_irqrestore(&ctx->ctx_lock, flags);
- return ret;
+ return;
}
/* aio_read_evt
@@ -1307,7 +1312,7 @@ static void aio_advance_iovec(struct kio
BUG_ON(ret > 0 && iocb->ki_left == 0);
}
-static ssize_t aio_rw_vect_retry(struct kiocb *iocb)
+static int aio_rw_vect_retry(struct kiocb *iocb)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@@ -1341,26 +1346,26 @@ static ssize_t aio_rw_vect_retry(struct
/* 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 (iocb->ki_left == 0)
+ ret = 0;
- return ret;
+ return (int) ret;
}
-static ssize_t aio_fdsync(struct kiocb *iocb)
+static int aio_fdsync(struct kiocb *iocb)
{
struct file *file = iocb->ki_filp;
- ssize_t ret = -EINVAL;
+ int ret = -EINVAL;
if (file->f_op->aio_fsync)
ret = file->f_op->aio_fsync(iocb, 1);
return ret;
}
-static ssize_t aio_fsync(struct kiocb *iocb)
+static int aio_fsync(struct kiocb *iocb)
{
struct file *file = iocb->ki_filp;
- ssize_t ret = -EINVAL;
+ int ret = -EINVAL;
if (file->f_op->aio_fsync)
ret = file->f_op->aio_fsync(iocb, 0);
diff -urpN -X dontdiff a/fs/block_dev.c b/fs/block_dev.c
--- a/fs/block_dev.c 2007-01-12 11:19:45.000000000 -0800
+++ b/fs/block_dev.c 2007-01-12 14:42:05.000000000 -0800
@@ -147,12 +147,8 @@ static int blk_end_aio(struct bio *bio,
if (error)
iocb->ki_nbytes = -EIO;
- if (atomic_dec_and_test(bio_count)) {
- if ((long)iocb->ki_nbytes < 0)
- aio_complete(iocb, iocb->ki_nbytes, 0);
- else
- aio_complete(iocb, iocb->ki_left, 0);
- }
+ if (atomic_dec_and_test(bio_count))
+ aio_complete(iocb, iocb->ki_left, iocb->ki_nbytes);
return 0;
}
diff -urpN -X dontdiff a/fs/direct-io.c b/fs/direct-io.c
--- a/fs/direct-io.c 2007-01-12 14:42:29.000000000 -0800
+++ b/fs/direct-io.c 2007-01-12 14:25:34.000000000 -0800
@@ -224,8 +224,6 @@ static struct page *dio_get_page(struct
*/
static int dio_complete(struct dio *dio, loff_t offset, int ret)
{
- ssize_t transferred = 0;
-
/*
* AIO submission can race with bio completion to get here while
* expecting to have the last io completed by bio completion.
@@ -236,15 +234,13 @@ static int dio_complete(struct dio *dio,
ret = 0;
if (dio->result) {
- transferred = dio->result;
-
/* Check for short read case */
- if ((dio->rw == READ) && ((offset + transferred) > dio->i_size))
- transferred = dio->i_size - offset;
+ if ((dio->rw == READ) && ((offset + dio->result) > dio->i_size))
+ dio->result = dio->i_size - offset;
}
if (dio->end_io && dio->result)
- dio->end_io(dio->iocb, offset, transferred,
+ dio->end_io(dio->iocb, offset, dio->result,
dio->map_bh.b_private);
if (dio->lock_type == DIO_LOCKING)
/* lockdep: non-owner release */
@@ -254,8 +250,6 @@ static int dio_complete(struct dio *dio,
ret = dio->page_errors;
if (ret == 0)
ret = dio->io_error;
- if (ret == 0)
- ret = transferred;
return ret;
}
@@ -283,8 +277,8 @@ static int dio_bio_end_aio(struct bio *b
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);
+ int err = dio_complete(dio, dio->iocb->ki_pos, 0);
+ aio_complete(dio->iocb, dio->result, err);
kfree(dio);
}
@@ -1110,6 +1104,8 @@ direct_io_worker(int rw, struct kiocb *i
BUG_ON(!dio->is_async && ret2 != 0);
if (ret2 == 0) {
ret = dio_complete(dio, offset, ret);
+ if (ret == 0)
+ ret = dio->result; /* bytes transferred */
kfree(dio);
} else
BUG_ON(ret != -EIOCBQUEUED);
diff -urpN -X dontdiff a/fs/nfs/direct.c b/fs/nfs/direct.c
--- a/fs/nfs/direct.c 2007-01-12 11:18:52.000000000 -0800
+++ b/fs/nfs/direct.c 2007-01-12 14:39:48.000000000 -0800
@@ -200,12 +200,9 @@ out:
*/
static void nfs_direct_complete(struct nfs_direct_req *dreq)
{
- if (dreq->iocb) {
- long res = (long) dreq->error;
- if (!res)
- res = (long) dreq->count;
- aio_complete(dreq->iocb, res, 0);
- }
+ if (dreq->iocb)
+ aio_complete(dreq->iocb, dreq->count, dreq->error);
+
complete_all(&dreq->completion);
kref_put(&dreq->kref, nfs_direct_req_release);
diff -urpN -X dontdiff a/include/linux/aio.h b/include/linux/aio.h
--- a/include/linux/aio.h 2007-01-12 14:42:29.000000000 -0800
+++ b/include/linux/aio.h 2007-01-12 14:25:34.000000000 -0800
@@ -15,10 +15,9 @@
struct kioctx;
/* Notes on cancelling a kiocb:
- * If a kiocb is cancelled, aio_complete may return 0 to indicate
- * that cancel has not yet disposed of the kiocb. All cancel
- * operations *must* call aio_put_req to dispose of the kiocb
- * to guard against races with the completion code.
+ * If a kiocb is cancelled, aio_complete may not yet have disposed of
+ * the kiocb. All cancel operations *must* call aio_put_req to dispose
+ * of the kiocb to guard against races with the completion code.
*/
#define KIOCB_C_CANCELLED 0x01
#define KIOCB_C_COMPLETE 0x02
@@ -98,7 +97,7 @@ struct kiocb {
struct file *ki_filp;
struct kioctx *ki_ctx; /* may be NULL for sync ops */
int (*ki_cancel)(struct kiocb *, struct io_event *);
- ssize_t (*ki_retry)(struct kiocb *);
+ int (*ki_retry)(struct kiocb *);
void (*ki_dtor)(struct kiocb *);
union {
@@ -208,7 +207,7 @@ extern unsigned aio_max_size;
extern ssize_t FASTCALL(wait_on_sync_kiocb(struct kiocb *iocb));
extern int FASTCALL(aio_put_req(struct kiocb *iocb));
extern void FASTCALL(kick_iocb(struct kiocb *iocb));
-extern int FASTCALL(aio_complete(struct kiocb *iocb, long res, long res2));
+extern void FASTCALL(aio_complete(void *endio_data, ssize_t count, int err));
extern void FASTCALL(__put_ioctx(struct kioctx *ctx));
struct mm_struct;
extern void FASTCALL(exit_aio(struct mm_struct *mm));
diff -urpN -X dontdiff a/include/linux/fs.h b/include/linux/fs.h
--- a/include/linux/fs.h 2007-01-12 14:42:29.000000000 -0800
+++ b/include/linux/fs.h 2007-01-12 14:25:34.000000000 -0800
@@ -1109,6 +1109,8 @@ typedef int (*read_actor_t)(read_descrip
#define HAVE_COMPAT_IOCTL 1
#define HAVE_UNLOCKED_IOCTL 1
+typedef void (file_endio_t)(void *endio_data, ssize_t count, int err);
+
/*
* NOTE:
* read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
-
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