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fs: dlm: add lkb waiters debugfs functionality

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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>
This commit is contained in:
Alexander Aring 2021-11-02 15:17:23 -04:00 committed by David Teigland
parent 5054e79de9
commit 63eab2b00b
3 changed files with 43 additions and 1 deletions
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27
fs/dlm/debug_fs.c
View file

@ -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);

15
fs/dlm/lock.c
View file

@ -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;
}

2
fs/dlm/lock.h
View file

@ -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)
{