From mboxrd@z Thu Jan 1 00:00:00 1970 From: wengang wang Date: Tue Jan 8 21:38:48 2008 Subject: [Ocfs2-devel] [PATCH 1/1] ocfs2: add dlm context printing in dlm debug Message-ID: <47806870.5070007@oracle.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com add dlm context printing support in dlm debugging - echo 'd' >/proc/fs/ocfs2_dlm/debug prints all dlm contexts. - echo 'D UUID' >/proc/fs/ocfs2_dlm/debug prints the context of the specified dlm Signed-off-by: wengang wang Singed-off-by: Tao Ma --- dlmdebug.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) --- ./fs/ocfs2/dlm/dlmdebug.c.orig 2008-01-09 06:39:18.000000000 -0500 +++ ./fs/ocfs2/dlm/dlmdebug.c 2008-01-10 03:17:13.000000000 -0500 @@ -61,6 +61,10 @@ static int dlm_proc_stats(char *page, char **start, off_t off, int count, int *eof, void *data); +static void __dlm_print_one_dlm_ctxt(struct dlm_ctxt *dlm); +static int dlm_dump_one_dlm_ctxt(const char __user *buf, unsigned int count); +static int dlm_dump_all_dlm_ctxts(const char __user *buf, unsigned int count); + typedef int (dlm_debug_func_t)(const char __user *data, unsigned int len); struct dlm_debug_funcs @@ -75,6 +79,8 @@ { 'm', dlm_dump_all_mles }, { 'p', dlm_dump_all_purge_lists }, { 'M', dlm_trigger_migration }, + { 'd', dlm_dump_all_dlm_ctxts }, + { 'D', dlm_dump_one_dlm_ctxt }, }; static int dlm_debug_map_sz = (sizeof(dlm_debug_map) / sizeof(struct dlm_debug_funcs)); @@ -210,7 +216,105 @@ spin_unlock(&dlm_domain_lock); return len; } +static void __dlm_print_one_dlm_ctxt(struct dlm_ctxt *dlm) +{ + mlog(ML_NOTICE, "purge_count: %d, name: %s\n", + dlm->purge_count, dlm->name); + mlog(ML_NOTICE, "node_num: %u, key: %u\n", + dlm->node_num, dlm->key); + mlog(ML_NOTICE, "joining_node: %u, reco->new_master: %u\n", + dlm->joining_node, dlm->reco.new_master); + mlog(ML_NOTICE, "reco->dead_node: %u, reco->state: %u\n", + dlm->reco.dead_node, dlm->reco.state); + mlog(ML_NOTICE, "dlm_state: %d, num_joins: %d\n", + dlm->dlm_state, dlm->num_joins); +} +static int dlm_dump_all_dlm_ctxts(const char __user *data, unsigned int len) +{ + struct dlm_ctxt *dlm; + struct list_head *iter; + + mlog(ML_NOTICE, "dumping ALL dlm contexts for node %s\n", + system_utsname.nodename); + spin_lock(&dlm_domain_lock); + list_for_each(iter, &dlm_domains) { + dlm = list_entry (iter, struct dlm_ctxt, list); + spin_lock(&dlm->spinlock); + __dlm_print_one_dlm_ctxt(dlm); + spin_unlock(&dlm->spinlock); + } + spin_unlock(&dlm_domain_lock); + return len; +} +static int dlm_dump_one_dlm_ctxt(const char __user *data, unsigned int len) +{ + struct dlm_ctxt *dlm; + char *buf = NULL, *tmp; + int ret = -EINVAL; + + mlog(ML_NOTICE, "dumping one dlm context for node %s\n", + system_utsname.nodename); + + if (len >= PAGE_SIZE-1) { + mlog(ML_ERROR, "user passed too much data: %d bytes\n", len); + goto leave; + } + if (len < 4) { + mlog(ML_ERROR, "user passed too little data: %d bytes\n", len); + goto leave; + } + buf = kmalloc(len+1, GFP_NOFS); + if (!buf) { + mlog(ML_ERROR, "could not alloc %d bytes\n", len+1); + ret = -ENOMEM; + goto leave; + } + if (strncpy_from_user(buf, data, len) < len) { + mlog(ML_ERROR, "failed to get all user data\n"); + goto leave; + } + buf[len] = '\0'; + mlog(0, "got this data from user: %s\n", buf); + + tmp = buf+1; + if (*tmp != ' ') { + mlog(ML_ERROR, "bad data\n"); + goto leave; + } + tmp ++; + + while (*tmp != '\0') { + if (*tmp == '\n' || *tmp == '\r') { + *tmp = '\0'; + break; + } + tmp ++; + } + spin_lock(&dlm_domain_lock); + dlm = __dlm_lookup_domain(buf+2); + spin_unlock(&dlm_domain_lock); + if (dlm) { + if (!dlm_grab(dlm)) { + mlog(ML_ERROR, "bad dlm!\n"); + goto leave; + } + spin_lock(&dlm_domain_lock); + spin_lock(&dlm->spinlock); + __dlm_print_one_dlm_ctxt(dlm); + spin_unlock(&dlm->spinlock); + spin_unlock(&dlm_domain_lock); + dlm_put(dlm); + } else { + mlog(ML_ERROR, "no such dlm: %s(%lu)\n", buf+2, strlen(buf+2)); + goto leave; + } + ret = len; +leave: + if (buf) + kfree(buf); + return ret; +} static int dlm_dump_one_lock_resource(const char __user *data, unsigned int len) {