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authorYan, Zheng <zyan@redhat.com>2017-07-11 12:34:46 +0300
committerIlya Dryomov <idryomov@gmail.com>2017-09-06 20:56:41 +0300
commit95cca2b44e54b00a3ed6ed7dc869717cd6807e81 (patch)
tree944f555f63a1b9641f2598703a562777437b0456 /fs/ceph/super.h
parentaa187926b739fb391f153335c7552c7a10d60e82 (diff)
downloadlinux-95cca2b44e54b00a3ed6ed7dc869717cd6807e81.tar.xz
ceph: limit osd write size
OSD has a configurable limitation of max write size. OSD return error if write request size is larger than the limitation. For now, set max write size to CEPH_MSG_MAX_DATA_LEN. It should be small enough. Signed-off-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/super.h')
-rw-r--r--fs/ceph/super.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 2b1b021ad6b8..eed2a67d8e52 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -48,6 +48,9 @@
/* max size of osd read request, limited by libceph */
#define CEPH_MAX_READ_SIZE CEPH_MSG_MAX_DATA_LEN
+/* osd has a configurable limitaion of max write size.
+ * CEPH_MSG_MAX_DATA_LEN should be small enough. */
+#define CEPH_MAX_WRITE_SIZE CEPH_MSG_MAX_DATA_LEN
#define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */
#define CEPH_MAX_READDIR_DEFAULT 1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)