[Ocfs2-devel] [PATCH 1/3] ocfs2/dlm: Cleanup dlmdebug.c
Sunil Mushran
sunil.mushran at oracle.com
Mon Dec 20 16:34:59 PST 2010
Remove struct debug_buffer in dlmdebug.c/h.
Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>
---
fs/ocfs2/dlm/dlmdebug.c | 178 +++++++++++++++++-----------------------------
fs/ocfs2/dlm/dlmdebug.h | 5 --
2 files changed, 66 insertions(+), 117 deletions(-)
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index 272ec86..77199ca 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -370,92 +370,46 @@ static void dlm_debug_get(struct dlm_debug_ctxt *dc)
kref_get(&dc->debug_refcnt);
}
-static struct debug_buffer *debug_buffer_allocate(void)
+static int debug_release(struct inode *inode, struct file *file)
{
- struct debug_buffer *db = NULL;
-
- db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
- if (!db)
- goto bail;
-
- db->len = PAGE_SIZE;
- db->buf = kmalloc(db->len, GFP_KERNEL);
- if (!db->buf)
- goto bail;
-
- return db;
-bail:
- kfree(db);
- return NULL;
-}
-
-static ssize_t debug_buffer_read(struct file *file, char __user *buf,
- size_t nbytes, loff_t *ppos)
-{
- struct debug_buffer *db = file->private_data;
-
- return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
-}
-
-static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
-{
- struct debug_buffer *db = file->private_data;
- loff_t new = -1;
-
- switch (whence) {
- case 0:
- new = off;
- break;
- case 1:
- new = file->f_pos + off;
- break;
- }
-
- if (new < 0 || new > db->len)
- return -EINVAL;
-
- return (file->f_pos = new);
+ free_page((unsigned long)file->private_data);
+ return 0;
}
-static int debug_buffer_release(struct inode *inode, struct file *file)
+static ssize_t debug_read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
{
- struct debug_buffer *db = file->private_data;
-
- if (db)
- kfree(db->buf);
- kfree(db);
-
- return 0;
+ return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+ i_size_read(file->f_mapping->host));
}
/* end - util funcs */
/* begin - purge list funcs */
-static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
+static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
{
struct dlm_lock_resource *res;
int out = 0;
unsigned long total = 0;
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, 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)
+ if (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",
+ buf + out, len - out);
+ out += snprintf(buf + out, 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);
+ out += snprintf(buf + out, len - out, "Total on list: %ld\n", total);
return out;
}
@@ -463,15 +417,15 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
static int debug_purgelist_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
- struct debug_buffer *db;
+ char *buf = NULL;
- db = debug_buffer_allocate();
- if (!db)
+ buf = (char *) get_zeroed_page(GFP_NOFS);
+ if (!buf)
goto bail;
- db->len = debug_purgelist_print(dlm, db);
+ i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
- file->private_data = db;
+ file->private_data = buf;
return 0;
bail:
@@ -480,14 +434,14 @@ bail:
static const struct file_operations debug_purgelist_fops = {
.open = debug_purgelist_open,
- .release = debug_buffer_release,
- .read = debug_buffer_read,
- .llseek = debug_buffer_llseek,
+ .release = debug_release,
+ .read = debug_read,
+ .llseek = generic_file_llseek,
};
/* end - purge list funcs */
/* begin - debug mle funcs */
-static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
+static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
{
struct dlm_master_list_entry *mle;
struct hlist_head *bucket;
@@ -495,7 +449,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
int i, out = 0;
unsigned long total = 0, longest = 0, bucket_count = 0;
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Dumping MLEs for Domain: %s\n", dlm->name);
spin_lock(&dlm->master_lock);
@@ -506,16 +460,16 @@ static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
master_hash_node);
++total;
++bucket_count;
- if (db->len - out < 200)
+ if (len - out < 200)
continue;
- out += dump_mle(mle, db->buf + out, db->len - out);
+ out += dump_mle(mle, buf + out, len - out);
}
longest = max(longest, bucket_count);
bucket_count = 0;
}
spin_unlock(&dlm->master_lock);
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Total: %ld, Longest: %ld\n", total, longest);
return out;
}
@@ -523,15 +477,15 @@ static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
static int debug_mle_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
- struct debug_buffer *db;
+ char *buf = NULL;
- db = debug_buffer_allocate();
- if (!db)
+ buf = (char *) get_zeroed_page(GFP_NOFS);
+ if (!buf)
goto bail;
- db->len = debug_mle_print(dlm, db);
+ i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
- file->private_data = db;
+ file->private_data = buf;
return 0;
bail:
@@ -540,9 +494,9 @@ bail:
static const struct file_operations debug_mle_fops = {
.open = debug_mle_open,
- .release = debug_buffer_release,
- .read = debug_buffer_read,
- .llseek = debug_buffer_llseek,
+ .release = debug_release,
+ .read = debug_read,
+ .llseek = generic_file_llseek,
};
/* end - debug mle funcs */
@@ -757,7 +711,7 @@ static const struct file_operations debug_lockres_fops = {
/* end - debug lockres funcs */
/* begin - debug state funcs */
-static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
+static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
{
int out = 0;
struct dlm_reco_node_data *node;
@@ -781,35 +735,35 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
}
/* Domain: xxxxxxxxxx Key: 0xdfbac769 */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Domain: %s Key: 0x%08x Protocol: %d.%d\n",
dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
dlm->dlm_locking_proto.pv_minor);
/* Thread Pid: xxx Node: xxx State: xxxxx */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Thread Pid: %d Node: %d State: %s\n",
dlm->dlm_thread_task->pid, dlm->node_num, state);
/* Number of Joins: xxx Joining Node: xxx */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Number of Joins: %d Joining Node: %d\n",
dlm->num_joins, dlm->joining_node);
/* Domain Map: xx xx xx */
- out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
+ out += snprintf(buf + out, len - out, "Domain Map: ");
out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
- db->buf + out, db->len - out);
- out += snprintf(db->buf + out, db->len - out, "\n");
+ buf + out, len - out);
+ out += snprintf(buf + out, len - out, "\n");
/* Live Map: xx xx xx */
- out += snprintf(db->buf + out, db->len - out, "Live Map: ");
+ out += snprintf(buf + out, len - out, "Live Map: ");
out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
- db->buf + out, db->len - out);
- out += snprintf(db->buf + out, db->len - out, "\n");
+ buf + out, len - out);
+ out += snprintf(buf + out, len - out, "\n");
/* Lock Resources: xxx (xxx) */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Lock Resources: %d (%d)\n",
atomic_read(&dlm->res_cur_count),
atomic_read(&dlm->res_tot_count));
@@ -821,29 +775,29 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
cur_mles += atomic_read(&dlm->mle_cur_count[i]);
/* MLEs: xxx (xxx) */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"MLEs: %d (%d)\n", cur_mles, tot_mles);
/* Blocking: xxx (xxx) */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
" Blocking: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
/* Mastery: xxx (xxx) */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
" Mastery: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
/* Migration: xxx (xxx) */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
" Migration: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
/* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Lists: Dirty=%s Purge=%s PendingASTs=%s "
"PendingBASTs=%s\n",
(list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
@@ -852,12 +806,12 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
(list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
/* Purge Count: xxx Refs: xxx */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Purge Count: %d Refs: %d\n", dlm->purge_count,
atomic_read(&dlm->dlm_refs.refcount));
/* Dead Node: xxx */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Dead Node: %d\n", dlm->reco.dead_node);
/* What about DLM_RECO_STATE_FINALIZE? */
@@ -867,19 +821,19 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
state = "INACTIVE";
/* Recovery Pid: xxxx Master: xxx State: xxxx */
- out += snprintf(db->buf + out, db->len - out,
+ out += snprintf(buf + out, len - out,
"Recovery Pid: %d Master: %d State: %s\n",
dlm->dlm_reco_thread_task->pid,
dlm->reco.new_master, state);
/* Recovery Map: xx xx */
- out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
+ out += snprintf(buf + out, len - out, "Recovery Map: ");
out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
- db->buf + out, db->len - out);
- out += snprintf(db->buf + out, db->len - out, "\n");
+ buf + out, len - out);
+ out += snprintf(buf + out, len - out, "\n");
/* Recovery Node State: */
- out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
+ out += snprintf(buf + out, len - out, "Recovery Node State:\n");
list_for_each_entry(node, &dlm->reco.node_data, list) {
switch (node->state) {
case DLM_RECO_NODE_DATA_INIT:
@@ -907,7 +861,7 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
state = "BAD";
break;
}
- out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
+ out += snprintf(buf + out, len - out, "\t%u - %s\n",
node->node_num, state);
}
@@ -919,15 +873,15 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
static int debug_state_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
- struct debug_buffer *db = NULL;
+ char *buf = NULL;
- db = debug_buffer_allocate();
- if (!db)
+ buf = (char *) get_zeroed_page(GFP_NOFS);
+ if (!buf)
goto bail;
- db->len = debug_state_print(dlm, db);
+ i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
- file->private_data = db;
+ file->private_data = buf;
return 0;
bail:
@@ -936,9 +890,9 @@ bail:
static const struct file_operations debug_state_fops = {
.open = debug_state_open,
- .release = debug_buffer_release,
- .read = debug_buffer_read,
- .llseek = debug_buffer_llseek,
+ .release = debug_release,
+ .read = debug_read,
+ .llseek = generic_file_llseek,
};
/* end - debug state funcs */
diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h
index 8c686d2..1f27c48 100644
--- a/fs/ocfs2/dlm/dlmdebug.h
+++ b/fs/ocfs2/dlm/dlmdebug.h
@@ -37,11 +37,6 @@ struct dlm_debug_ctxt {
struct dentry *debug_purgelist_dentry;
};
-struct debug_buffer {
- int len;
- char *buf;
-};
-
struct debug_lockres {
int dl_len;
char *dl_buf;
--
1.7.1
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