[Ocfs2-devel] [PATCH 1/1]ocfs2: add dlm_ctxt printing for dlm debugging

[Sunil Mushran <Sunil.Mushran@oracle.com>]

Wengang,

Please follow coding standards. Links to it are there in the wiki.
If in doubt, look at the existing code and follow the same.

For e.g., indentation has to be a tab. Not 4 spaces or 8 spaces. A tab.

Hint: Look at the tops of the files.
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:

Secondly, you are printing all the elements of structure in one
line. When I had said a single line, I meant a few important
elements. Afterall, the output needs to be readable. If you are
printing more, split it into different lines... keep it concise
and yet readable.

Also, see what proc_stat prints. No point duplicating the info.

Thanks
Sunil

wengang wang wrote:
> add dlm_ctxt printing for dlm debugging
> cat /proc/fs/ocfs2_dlm/<domain>/ctxt shows dlm_ctxt
> after adding this, what stat prints is a subset of what ctxt prints. 
> but stat remains.
>
> this patch is against ocfs2-1.2 svn head.
>
> Signed-off-by: wengang wang <wen.gang.wang@oracle.com>
> ---
> dlmdebug.c |   64 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 64 insertions(+)
>
> Index: fs/ocfs2/dlm/dlmdebug.c
> ===================================================================
> --- fs/ocfs2/dlm/dlmdebug.c    (revision 3078)
> +++ fs/ocfs2/dlm/dlmdebug.c    (working copy)
> @@ -61,6 +61,8 @@ static int dlm_parse_domain_and_lockres(
>
> static int dlm_proc_stats(char *page, char **start, off_t off,
>               int count, int *eof, void *data);
> +static int dlm_proc_ctxts(char *page, char **start, off_t off,
> +              int count, int *eof, void *data);
>
> typedef int (dlm_debug_func_t)(const char __user *data, unsigned int 
> len);
>
> @@ -120,6 +122,7 @@ static struct file_operations dlm_debug_
> #define OCFS2_DLM_PROC_PATH "fs/ocfs2_dlm"
> #define DLM_DEBUG_PROC_NAME "debug"
> #define DLM_STAT_PROC_NAME  "stat"
> +#define DLM_CTXT_PROC_NAME  "ctxt"
>
> static struct proc_dir_entry *ocfs2_dlm_proc;
>
> @@ -172,6 +175,61 @@ static int dlm_proc_stats(char *page, ch
>     return len;
> }
>
> +static int dlm_proc_ctxts(char *page, char **start, off_t off,
> +              int count, int *eof, void *data)
> +{
> +    int len = 0, i;
> +    struct dlm_ctxt *dlm = data;
> +
> +    len += sprintf(page + len, "purge=%d, num=%u, key=0x%08x, ",
> +            dlm->purge_count, dlm->node_num, dlm->key);
> +    len += sprintf(page + len, "joining=%u, reco.new=%u, ",
> +            dlm->joining_node, dlm->reco.new_master);
> +    len += sprintf(page + len, "reco.dead=%u, reco.state=%u, ",
> +            dlm->reco.dead_node, dlm->reco.state);
> +    len += sprintf(page + len, "local=%d, remote=%d, ",
> +            atomic_read(&dlm->local_resources),
> +            atomic_read(&dlm->remote_resources));
> +    len += sprintf(page + len, "unknown=%d, refs=%d, ",
> +            atomic_read(&dlm->dlm_refs.refcount),
> +            atomic_read(&dlm->unknown_resources));
> +    len += sprintf(page + len, "state=%d, joins=%u, ",
> +            dlm->dlm_state, dlm->num_joins);
> +
> +    len += sprintf(page + len, "live=");
> +    for (i = 0; i < O2NM_MAX_NODES; i++) {
> +        if (test_bit(i,dlm->live_nodes_map))
> +            len += sprintf(page + len,"%d ",i);
> +    }
> +    len += sprintf(page + len,", ");
> +
> +    len += sprintf(page + len, "domain=");
> +    for (i = 0; i < O2NM_MAX_NODES; i++) {
> +        if (test_bit(i,dlm->domain_map))
> +            len += sprintf(page + len,"%d ",i);
> +    }
> +    len += sprintf(page + len,", ");
> +
> +    len += sprintf(page + len, "recovery=");
> +    for (i = 0; i < O2NM_MAX_NODES; i++) {
> +        if (test_bit(i,dlm->recovery_map))
> +            len += sprintf(page + len,"%d ",i);
> +    }
> +    len += sprintf(page + len,"\n");
> +
> +    if (len <= off + count)
> +        *eof = 1;
> +   
> +    *start = page + off;
> +    len -= off;
> +    if (len > count)
> +        len = count;
> +    if(len < 0)
> +        len = 0;
> +
> +    return len;
> +}
> +
> void dlm_proc_add_domain(struct dlm_ctxt *dlm)
> {
>     struct proc_dir_entry *entry;
> @@ -183,6 +241,11 @@ void dlm_proc_add_domain(struct dlm_ctxt
>                            dlm_proc_stats, (char *)dlm);
>         if (entry)
>             entry->owner = THIS_MODULE;
> +        entry = create_proc_read_entry(DLM_CTXT_PROC_NAME,
> +                        S_IFREG | S_IRUGO, dlm->dlm_proc,
> +                        dlm_proc_ctxts, (char *)dlm);
> +        if (entry)
> +            entry->owner = THIS_MODULE;
>     }
> }
>
> @@ -190,6 +253,7 @@ void dlm_proc_del_domain(struct dlm_ctxt
> {
>     if (dlm->dlm_proc) {
>         remove_proc_entry(DLM_STAT_PROC_NAME, dlm->dlm_proc);
> +        remove_proc_entry(DLM_CTXT_PROC_NAME, dlm->dlm_proc);
>         remove_proc_entry(dlm->name, ocfs2_dlm_proc);
>     }
> }
>
>
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