summaryrefslogtreecommitdiff
path: root/fs/dlm
diff options
context:
space:
mode:
authorAlexander Aring <aahringo@redhat.com>2020-11-02 20:04:17 -0500
committerDavid Teigland <teigland@redhat.com>2020-11-10 12:14:20 -0600
commit9f8f9c774ad10aa1c15952c36f580d7e3711a100 (patch)
tree6627ac58e29ae5c1c08419e814a133eacd88e202 /fs/dlm
parent5cbec208dc994de860ae72d3340bc54f14e71b39 (diff)
fs: dlm: define max send buffer
This patch will set the maximum transmit buffer size for rcom messages with "names" to 4096 bytes. It's a leftover change of commit 4798cbbfbd00 ("fs: dlm: rework receive handling"). Fact is that we cannot allocate a contiguous transmit buffer length above of 4096 bytes. It seems at some places the upper layer protocol will calculate according to dlm_config.ci_buffer_size the possible payload of a dlm recovery message. As compiler setting we will use now the maximum possible message which dlm can send out. Commit 4e192ee68e5af ("fs: dlm: disallow buffer size below default") disallow a buffer setting smaller than the 4096 bytes and above 4096 bytes is definitely wrong because we will then write out of buffer space as we cannot allocate a contiguous buffer above 4096 bytes. The ci_buffer_size is still there to define the possible maximum receive buffer size of a recvmsg() which should be at least the maximum possible dlm message size. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/lockspace.c2
-rw-r--r--fs/dlm/lowcomms.h2
-rw-r--r--fs/dlm/member.c2
-rw-r--r--fs/dlm/rcom.c6
4 files changed, 7 insertions, 5 deletions
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index 624617c12250..561dcad08ad6 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -572,7 +572,7 @@ static int new_lockspace(const char *name, const char *cluster,
mutex_init(&ls->ls_requestqueue_mutex);
mutex_init(&ls->ls_clear_proc_locks);
- ls->ls_recover_buf = kmalloc(dlm_config.ci_buffer_size, GFP_NOFS);
+ ls->ls_recover_buf = kmalloc(LOWCOMMS_MAX_TX_BUFFER_LEN, GFP_NOFS);
if (!ls->ls_recover_buf)
goto out_lkbidr;
diff --git a/fs/dlm/lowcomms.h b/fs/dlm/lowcomms.h
index 687b2894e469..0918f9376489 100644
--- a/fs/dlm/lowcomms.h
+++ b/fs/dlm/lowcomms.h
@@ -12,6 +12,8 @@
#ifndef __LOWCOMMS_DOT_H__
#define __LOWCOMMS_DOT_H__
+#define LOWCOMMS_MAX_TX_BUFFER_LEN 4096
+
int dlm_lowcomms_start(void);
void dlm_lowcomms_stop(void);
void dlm_lowcomms_exit(void);
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index 7ad83deb4505..ceef3f2074ff 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -270,7 +270,7 @@ int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size,
log_slots(ls, gen, num, NULL, array, array_size);
- max_slots = (dlm_config.ci_buffer_size - sizeof(struct dlm_rcom) -
+ max_slots = (LOWCOMMS_MAX_TX_BUFFER_LEN - sizeof(struct dlm_rcom) -
sizeof(struct rcom_config)) / sizeof(struct rcom_slot);
if (num > max_slots) {
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index 4daf5dc2b51c..73ddee5159d7 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -162,7 +162,7 @@ retry:
set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
allow_sync_reply(ls, &rc->rc_id);
- memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
+ memset(ls->ls_recover_buf, 0, LOWCOMMS_MAX_TX_BUFFER_LEN);
send_rcom(ls, mh, rc);
@@ -284,7 +284,7 @@ retry:
memcpy(rc->rc_buf, last_name, last_len);
allow_sync_reply(ls, &rc->rc_id);
- memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
+ memset(ls->ls_recover_buf, 0, LOWCOMMS_MAX_TX_BUFFER_LEN);
send_rcom(ls, mh, rc);
@@ -304,7 +304,7 @@ static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
nodeid = rc_in->rc_header.h_nodeid;
inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
- outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
+ outlen = LOWCOMMS_MAX_TX_BUFFER_LEN - sizeof(struct dlm_rcom);
error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
if (error)