This is a note to let you know that I've just added the patch titled
ceph: allocate sparse_ext map only for sparse reads
to the 6.6-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-allocate-sparse_ext-map-only-for-sparse-reads.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1050cd9e0981afed8a01154a1d039e72aa1fac4d
Author: Ilya Dryomov <idryomov@xxxxxxxxx>
Date: Sat Dec 7 17:33:25 2024 +0100
ceph: allocate sparse_ext map only for sparse reads
[ Upstream commit 18d44c5d062b97b97bb0162d9742440518958dc1 ]
If mounted with sparseread option, ceph_direct_read_write() ends up
making an unnecessarily allocation for O_DIRECT writes.
Fixes: 03bc06c7b0bd ("ceph: add new mount option to enable sparse reads")
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Reviewed-by: Alex Markuze <amarkuze@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 5233bbab8a76..a03b11cf7887 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1455,7 +1455,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
}
op = &req->r_ops[0];
- if (sparse) {
+ if (!write && sparse) {
extent_cnt = __ceph_sparse_read_ext_count(inode, size);
ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
if (ret) {
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 3babcd5e65e1..0b6a8bb0642f 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1173,6 +1173,8 @@ EXPORT_SYMBOL(ceph_osdc_new_request);
int __ceph_alloc_sparse_ext_map(struct ceph_osd_req_op *op, int cnt)
{
+ WARN_ON(op->op != CEPH_OSD_OP_SPARSE_READ);
+
op->extent.sparse_ext_cnt = cnt;
op->extent.sparse_ext = kmalloc_array(cnt,
sizeof(*op->extent.sparse_ext),
