This is a note to let you know that I've just added the patch titled
ceph: fix blindly expanding the readahead windows
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ceph-fix-blindly-expanding-the-readahead-windows.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dc94bb8f271c079f69583d0f12a489aaf5202751 Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@xxxxxxxxxx>
Date: Thu, 4 May 2023 19:00:42 +0800
Subject: ceph: fix blindly expanding the readahead windows
From: Xiubo Li <xiubli@xxxxxxxxxx>
commit dc94bb8f271c079f69583d0f12a489aaf5202751 upstream.
Blindly expanding the readahead windows will cause unneccessary
pagecache thrashing and also will introduce the network workload.
We should disable expanding the windows if the readahead is disabled
and also shouldn't expand the windows too much.
Expanding forward firstly instead of expanding backward for possible
sequential reads.
Bound `rreq->len` to the actual file size to restore the previous page
cache usage.
The posix_fadvise may change the maximum size of a file readahead.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 49870056005c ("ceph: convert ceph_readpages to ceph_readahead")
Link: https://lore.kernel.org/ceph-devel/20230504082510.247-1-sehuww@xxxxxxxxxxxxxxxx
Link: https://www.spinics.net/lists/ceph-users/msg76183.html
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
Reviewed-and-tested-by: Hu Weiwen <sehuww@xxxxxxxxxxxxxxxx>
Reviewed-by: Milind Changire <mchangir@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ceph/addr.c | 40 +++++++++++++++++++++++++++++++++-------
1 file changed, 33 insertions(+), 7 deletions(-)
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -187,16 +187,42 @@ static void ceph_netfs_expand_readahead(
struct inode *inode = rreq->inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_file_layout *lo = &ci->i_layout;
+ unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
+ loff_t end = rreq->start + rreq->len, new_end;
+ struct ceph_netfs_request_data *priv = rreq->netfs_priv;
+ unsigned long max_len;
u32 blockoff;
- u64 blockno;
- /* Expand the start downward */
- blockno = div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
- rreq->start = blockno * lo->stripe_unit;
- rreq->len += blockoff;
+ if (priv) {
+ /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
+ if (priv->file_ra_disabled)
+ max_pages = 0;
+ else
+ max_pages = priv->file_ra_pages;
- /* Now, round up the length to the next block */
- rreq->len = roundup(rreq->len, lo->stripe_unit);
+ }
+
+ /* Readahead is disabled */
+ if (!max_pages)
+ return;
+
+ max_len = max_pages << PAGE_SHIFT;
+
+ /*
+ * Try to expand the length forward by rounding up it to the next
+ * block, but do not exceed the file size, unless the original
+ * request already exceeds it.
+ */
+ new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
+ if (new_end > end && new_end <= rreq->start + max_len)
+ rreq->len = new_end - rreq->start;
+
+ /* Try to expand the start downward */
+ div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
+ if (rreq->len + blockoff <= max_len) {
+ rreq->start -= blockoff;
+ rreq->len += blockoff;
+ }
}
static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
Patches currently in stable-queue which might be from xiubli@xxxxxxxxxx are
queue-6.4/ceph-fix-blindly-expanding-the-readahead-windows.patch
queue-6.4/ceph-don-t-let-check_caps-skip-sending-responses-for-revoke-msgs.patch
queue-6.4/libceph-harden-msgr2.1-frame-segment-length-checks.patch
queue-6.4/ceph-add-a-dedicated-private-data-for-netfs-rreq.patch
