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ocfs2/dlm: Dumps the purgelist into a debugfs file

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This patch dumps all the lockres' on the purgelist it can fit in one page
into a debugfs file. Useful for debugging.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Sunil Mushran 2008-03-10 15:16:27 -07:00 committed by Mark Fasheh
parent d0129aceae
commit 7209300a9b
2 changed files with 72 additions and 0 deletions
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71
fs/ocfs2/dlm/dlmdebug.c
View File

@ -303,6 +303,7 @@ static int stringify_lockname(const char *lockname, int locklen,
#define DLM_DEBUGFS_DLM_STATE "dlm_state"
#define DLM_DEBUGFS_LOCKING_STATE "locking_state"
#define DLM_DEBUGFS_MLE_STATE "mle_state"
#define DLM_DEBUGFS_PURGE_LIST "purge_list"
/* begin - utils funcs */
static void dlm_debug_free(struct kref *kref)
@ -396,6 +397,63 @@ static int debug_buffer_release(struct inode *inode, struct file *file)
}
/* end - util funcs */
/* begin - purge list funcs */
static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
struct dlm_lock_resource *res;
int out = 0;
unsigned long total = 0;
out += snprintf(db->buf + out, db->len - out,
"Dumping Purgelist for Domain: %s\n", dlm->name);
spin_lock(&dlm->spinlock);
list_for_each_entry(res, &dlm->purge_list, purge) {
++total;
if (db->len - out < 100)
continue;
spin_lock(&res->spinlock);
out += stringify_lockname(res->lockname.name,
res->lockname.len,
db->buf + out, db->len - out);
out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
(jiffies - res->last_used)/HZ);
spin_unlock(&res->spinlock);
}
spin_unlock(&dlm->spinlock);
out += snprintf(db->buf + out, db->len - out,
"Total on list: %ld\n", total);
return out;
}
static int debug_purgelist_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
struct debug_buffer *db;
db = debug_buffer_allocate();
if (!db)
goto bail;
db->len = debug_purgelist_print(dlm, db);
file->private_data = db;
return 0;
bail:
return -ENOMEM;
}
static struct file_operations debug_purgelist_fops = {
.open = debug_purgelist_open,
.release = debug_buffer_release,
.read = debug_buffer_read,
.llseek = debug_buffer_llseek,
};
/* end - purge list funcs */
/* begin - debug mle funcs */
static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
{
@ -906,6 +964,17 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
goto bail;
}
/* for dumping lockres on the purge list */
dc->debug_purgelist_dentry =
debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
S_IFREG|S_IRUSR,
dlm->dlm_debugfs_subroot,
dlm, &debug_purgelist_fops);
if (!dc->debug_purgelist_dentry) {
mlog_errno(-ENOMEM);
goto bail;
}
dlm_debug_get(dc);
return 0;
@ -919,6 +988,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm)
struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
if (dc) {
if (dc->debug_purgelist_dentry)
debugfs_remove(dc->debug_purgelist_dentry);
if (dc->debug_mle_dentry)
debugfs_remove(dc->debug_mle_dentry);
if (dc->debug_lockres_dentry)

1
fs/ocfs2/dlm/dlmdebug.h
View File

@ -32,6 +32,7 @@ struct dlm_debug_ctxt {
struct dentry *debug_state_dentry;
struct dentry *debug_lockres_dentry;
struct dentry *debug_mle_dentry;
struct dentry *debug_purgelist_dentry;
};
struct debug_buffer {