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authorAlexander Aring <aahringo@redhat.com>2021-11-02 15:17:23 -0400
committerDavid Teigland <teigland@redhat.com>2021-11-02 14:39:20 -0500
commit63eab2b00bcff620682e8570367458c9619a9970 (patch)
treedad15a9f20972da5929364405c074f53f08b14f3 /fs/dlm
parent5054e79de99984b4f39a073534526bc7c827b1e0 (diff)
fs: dlm: add lkb waiters debugfs functionality
This patch adds functionality to put a lkb to the waiters state. It can be useful to combine this feature with the "rawmsg" debugfs functionality. It will bring the DLM lkb into a state that a message will be parsed by the kernel. 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/debug_fs.c27
-rw-r--r--fs/dlm/lock.c15
-rw-r--r--fs/dlm/lock.h2
3 files changed, 43 insertions, 1 deletions
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 2ead4751d655..df6f3f107be4 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -754,10 +754,35 @@ static ssize_t waiters_read(struct file *file, char __user *userbuf,
return rv;
}
+static ssize_t waiters_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct dlm_ls *ls = file->private_data;
+ int mstype, to_nodeid;
+ char buf[128] = {};
+ uint32_t lkb_id;
+ int n, error;
+
+ if (copy_from_user(buf, user_buf,
+ min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
+ n = sscanf(buf, "%x %d %d", &lkb_id, &mstype, &to_nodeid);
+ if (n != 3)
+ return -EINVAL;
+
+ error = dlm_debug_add_lkb_to_waiters(ls, lkb_id, mstype, to_nodeid);
+ if (error)
+ return error;
+
+ return count;
+}
+
static const struct file_operations waiters_fops = {
.owner = THIS_MODULE,
.open = simple_open,
.read = waiters_read,
+ .write = waiters_write,
.llseek = default_llseek,
};
@@ -907,7 +932,7 @@ void dlm_create_debug_file(struct dlm_ls *ls)
snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name);
ls->ls_debug_waiters_dentry = debugfs_create_file(name,
- S_IFREG | S_IRUGO,
+ 0644,
dlm_root,
ls,
&waiters_fops);
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index aeb793693d8c..0dbe273566c0 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -6363,3 +6363,18 @@ int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len,
return 0;
}
+int dlm_debug_add_lkb_to_waiters(struct dlm_ls *ls, uint32_t lkb_id,
+ int mstype, int to_nodeid)
+{
+ struct dlm_lkb *lkb;
+ int error;
+
+ error = find_lkb(ls, lkb_id, &lkb);
+ if (error)
+ return error;
+
+ error = add_to_waiters(lkb, mstype, to_nodeid);
+ dlm_put_lkb(lkb);
+ return error;
+}
+
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
index 863a66e128a2..252a5898f908 100644
--- a/fs/dlm/lock.h
+++ b/fs/dlm/lock.h
@@ -60,6 +60,8 @@ int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid);
void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc);
int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len,
int lkb_nodeid, unsigned int lkb_flags, int lkb_status);
+int dlm_debug_add_lkb_to_waiters(struct dlm_ls *ls, uint32_t lkb_id,
+ int mstype, int to_nodeid);
static inline int is_master(struct dlm_rsb *r)
{