Re: [PATCH v2] netfs: Fix io_uring based write-through
From: Steve French
Date: Tue May 21 2024 - 22:06:49 EST
fixed minor checpatch warning (updated patch attached)
On Tue, May 21, 2024 at 7:02 PM David Howells <dhowells@xxxxxxxxxx> wrote:
>
> This can be triggered by mounting a cifs filesystem with a cache=strict
> mount option and then, using the fsx program from xfstests, doing:
>
> ltp/fsx -A -d -N 1000 -S 11463 -P /tmp /cifs-mount/foo \
> --replay-ops=gen112-fsxops
>
> Where gen112-fsxops holds:
>
> fallocate 0x6be7 0x8fc5 0x377d3
> copy_range 0x9c71 0x77e8 0x2edaf 0x377d3
> write 0x2776d 0x8f65 0x377d3
>
> The problem is that netfs_io_request::len is being used for two purposes
> and ends up getting set to the amount of data we transferred, not the
> amount of data the caller asked to be transferred (for various reasons,
> such as mmap'd writes, we might end up rounding out the data written to the
> server to include the entire folio at each end).
>
> Fix this by keeping the amount we were asked to write in ->len and using
> ->submitted to track what we issued ops for. Then, when we come to calling
> ->ki_complete(), ->len is the right size.
>
> This also required netfs_cleanup_dio_write() to change since we're no
> longer advancing wreq->len. Use wreq->transferred instead as we might have
> done a short read and wreq->len must be set when setting up a direct write.
>
> With this, the generic/112 xfstest passes if cifs is forced to put all
> non-DIO opens into write-through mode.
>
> Fixes: 288ace2f57c9 ("netfs: New writeback implementation")
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: Jeff Layton <jlayton@xxxxxxxxxx>
> cc: Steve French <stfrench@xxxxxxxxxxxxx>
> cc: Enzo Matsumiya <ematsumiya@xxxxxxx>
> cc: netfs@xxxxxxxxxxxxxxx
> cc: v9fs@xxxxxxxxxxxxxxx
> cc: linux-afs@xxxxxxxxxxxxxxxxxxx
> cc: linux-cifs@xxxxxxxxxxxxxxx
> cc: linux-fsdevel@xxxxxxxxxxxxxxx
> Link: https://lore.kernel.org/r/295086.1716298663@xxxxxxxxxxxxxxxxxxxxxx/ # v1
> ---
> Changes
> =======
> ver #2)
> - Set wreq->len when doing direct writes.
>
> fs/netfs/direct_write.c | 5 +++--
> fs/netfs/write_collect.c | 7 ++++---
> fs/netfs/write_issue.c | 2 +-
> 3 files changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c
> index 608ba6416919..93b41e121042 100644
> --- a/fs/netfs/direct_write.c
> +++ b/fs/netfs/direct_write.c
> @@ -12,7 +12,7 @@
> static void netfs_cleanup_dio_write(struct netfs_io_request *wreq)
> {
> struct inode *inode = wreq->inode;
> - unsigned long long end = wreq->start + wreq->len;
> + unsigned long long end = wreq->start + wreq->transferred;
>
> if (!wreq->error &&
> i_size_read(inode) < end) {
> @@ -92,8 +92,9 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov
> __set_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags);
> if (async)
> wreq->iocb = iocb;
> + wreq->len = iov_iter_count(&wreq->io_iter);
> wreq->cleanup = netfs_cleanup_dio_write;
> - ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), iov_iter_count(&wreq->io_iter));
> + ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), wreq->len);
> if (ret < 0) {
> _debug("begin = %zd", ret);
> goto out;
> diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c
> index 60112e4b2c5e..426cf87aaf2e 100644
> --- a/fs/netfs/write_collect.c
> +++ b/fs/netfs/write_collect.c
> @@ -510,7 +510,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
> * stream has a gap that can be jumped.
> */
> if (notes & SOME_EMPTY) {
> - unsigned long long jump_to = wreq->start + wreq->len;
> + unsigned long long jump_to = wreq->start + READ_ONCE(wreq->submitted);
>
> for (s = 0; s < NR_IO_STREAMS; s++) {
> stream = &wreq->io_streams[s];
> @@ -690,10 +690,11 @@ void netfs_write_collection_worker(struct work_struct *work)
> wake_up_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS);
>
> if (wreq->iocb) {
> - wreq->iocb->ki_pos += wreq->transferred;
> + size_t written = min(wreq->transferred, wreq->len);
> + wreq->iocb->ki_pos += written;
> if (wreq->iocb->ki_complete)
> wreq->iocb->ki_complete(
> - wreq->iocb, wreq->error ? wreq->error : wreq->transferred);
> + wreq->iocb, wreq->error ? wreq->error : written);
> wreq->iocb = VFS_PTR_POISON;
> }
>
> diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
> index acbfd1f5ee9d..3aa86e268f40 100644
> --- a/fs/netfs/write_issue.c
> +++ b/fs/netfs/write_issue.c
> @@ -254,7 +254,7 @@ static void netfs_issue_write(struct netfs_io_request *wreq,
> stream->construct = NULL;
>
> if (subreq->start + subreq->len > wreq->start + wreq->submitted)
> - wreq->len = wreq->submitted = subreq->start + subreq->len - wreq->start;
> + WRITE_ONCE(wreq->submitted, subreq->start + subreq->len - wreq->start);
> netfs_do_issue_write(stream, subreq);
> }
>
>
--
Thanks,
Steve
From 73263d2e6023e4d7ef2dc6d917e01d38fd2a1a28 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@xxxxxxxxxx>
Date: Wed, 22 May 2024 01:02:30 +0100
Subject: [PATCH] netfs: Fix io_uring based write-through
This can be triggered by mounting a cifs filesystem with a cache=strict
mount option and then, using the fsx program from xfstests, doing:
ltp/fsx -A -d -N 1000 -S 11463 -P /tmp /cifs-mount/foo \
--replay-ops=gen112-fsxops
Where gen112-fsxops holds:
fallocate 0x6be7 0x8fc5 0x377d3
copy_range 0x9c71 0x77e8 0x2edaf 0x377d3
write 0x2776d 0x8f65 0x377d3
The problem is that netfs_io_request::len is being used for two purposes
and ends up getting set to the amount of data we transferred, not the
amount of data the caller asked to be transferred (for various reasons,
such as mmap'd writes, we might end up rounding out the data written to the
server to include the entire folio at each end).
Fix this by keeping the amount we were asked to write in ->len and using
->submitted to track what we issued ops for. Then, when we come to calling
->ki_complete(), ->len is the right size.
This also required netfs_cleanup_dio_write() to change since we're no
longer advancing wreq->len. Use wreq->transferred instead as we might have
done a short read and wreq->len must be set when setting up a direct write.
With this, the generic/112 xfstest passes if cifs is forced to put all
non-DIO opens into write-through mode.
Fixes: 288ace2f57c9 ("netfs: New writeback implementation")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: Steve French <stfrench@xxxxxxxxxxxxx>
cc: Enzo Matsumiya <ematsumiya@xxxxxxx>
cc: netfs@xxxxxxxxxxxxxxx
cc: v9fs@xxxxxxxxxxxxxxx
cc: linux-afs@xxxxxxxxxxxxxxxxxxx
cc: linux-cifs@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/295086.1716298663@xxxxxxxxxxxxxxxxxxxxxx/ # v1
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
---
fs/netfs/direct_write.c | 5 +++--
fs/netfs/write_collect.c | 8 +++++---
fs/netfs/write_issue.c | 2 +-
3 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c
index f516460e994e..88f2adfab75e 100644
--- a/fs/netfs/direct_write.c
+++ b/fs/netfs/direct_write.c
@@ -12,7 +12,7 @@
static void netfs_cleanup_dio_write(struct netfs_io_request *wreq)
{
struct inode *inode = wreq->inode;
- unsigned long long end = wreq->start + wreq->len;
+ unsigned long long end = wreq->start + wreq->transferred;
if (!wreq->error &&
i_size_read(inode) < end) {
@@ -92,8 +92,9 @@ ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *
__set_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags);
if (async)
wreq->iocb = iocb;
+ wreq->len = iov_iter_count(&wreq->io_iter);
wreq->cleanup = netfs_cleanup_dio_write;
- ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), iov_iter_count(&wreq->io_iter));
+ ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), wreq->len);
if (ret < 0) {
_debug("begin = %zd", ret);
goto out;
diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c
index 60112e4b2c5e..7a5d229cb1c7 100644
--- a/fs/netfs/write_collect.c
+++ b/fs/netfs/write_collect.c
@@ -510,7 +510,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
* stream has a gap that can be jumped.
*/
if (notes & SOME_EMPTY) {
- unsigned long long jump_to = wreq->start + wreq->len;
+ unsigned long long jump_to = wreq->start + READ_ONCE(wreq->submitted);
for (s = 0; s < NR_IO_STREAMS; s++) {
stream = &wreq->io_streams[s];
@@ -690,10 +690,12 @@ void netfs_write_collection_worker(struct work_struct *work)
wake_up_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS);
if (wreq->iocb) {
- wreq->iocb->ki_pos += wreq->transferred;
+ size_t written = min(wreq->transferred, wreq->len);
+
+ wreq->iocb->ki_pos += written;
if (wreq->iocb->ki_complete)
wreq->iocb->ki_complete(
- wreq->iocb, wreq->error ? wreq->error : wreq->transferred);
+ wreq->iocb, wreq->error ? wreq->error : written);
wreq->iocb = VFS_PTR_POISON;
}
diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index e190043bc0da..86dad7e4202b 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -254,7 +254,7 @@ static void netfs_issue_write(struct netfs_io_request *wreq,
stream->construct = NULL;
if (subreq->start + subreq->len > wreq->start + wreq->submitted)
- wreq->len = wreq->submitted = subreq->start + subreq->len - wreq->start;
+ WRITE_ONCE(wreq->submitted, subreq->start + subreq->len - wreq->start);
netfs_do_issue_write(stream, subreq);
}
--
2.40.1