[PATCH] jbd2 stats through procfs
The patch below updates the jbd stats patch to 2.6.20/jbd2.
The initial patch was posted by Alex Tomas in December 2005
(http://marc.info/?l=linux-ext4&m=113538565128617&w=2).
It provides statistics via procfs such as transaction lifetime and size.
[ This probably should be rewritten to use debugfs? -- Ted]
Signed-off-by: Johann Lombardi <[email protected]>
--
Index: linux-2.6.22-rc4/include/linux/jbd2.h
===================================================================
--- linux-2.6.22-rc4.orig/include/linux/jbd2.h 2007-06-11 17:28:17.000000000 -0700
+++ linux-2.6.22-rc4/include/linux/jbd2.h 2007-06-13 10:45:21.000000000 -0700
@@ -408,6 +408,16 @@
};
+/*
+ * Some stats for checkpoint phase
+ */
+struct transaction_chp_stats_s {
+ unsigned long cs_chp_time;
+ unsigned long cs_forced_to_close;
+ unsigned long cs_written;
+ unsigned long cs_dropped;
+};
+
/* The transaction_t type is the guts of the journaling mechanism. It
* tracks a compound transaction through its various states:
*
@@ -543,6 +553,21 @@
spinlock_t t_handle_lock;
/*
+ * Longest time some handle had to wait for running transaction
+ */
+ unsigned long t_max_wait;
+
+ /*
+ * When transaction started
+ */
+ unsigned long t_start;
+
+ /*
+ * Checkpointing stats [j_checkpoint_sem]
+ */
+ struct transaction_chp_stats_s t_chp_stats;
+
+ /*
* Number of outstanding updates running on this transaction
* [t_handle_lock]
*/
@@ -573,6 +598,57 @@
};
+struct transaction_run_stats_s {
+ unsigned long rs_wait;
+ unsigned long rs_running;
+ unsigned long rs_locked;
+ unsigned long rs_flushing;
+ unsigned long rs_logging;
+
+ unsigned long rs_handle_count;
+ unsigned long rs_blocks;
+ unsigned long rs_blocks_logged;
+};
+
+struct transaction_stats_s
+{
+ int ts_type;
+ unsigned long ts_tid;
+ union {
+ struct transaction_run_stats_s run;
+ struct transaction_chp_stats_s chp;
+ } u;
+};
+
+#define JBD2_STATS_RUN 1
+#define JBD2_STATS_CHECKPOINT 2
+
+#define ts_wait u.run.rs_wait
+#define ts_running u.run.rs_running
+#define ts_locked u.run.rs_locked
+#define ts_flushing u.run.rs_flushing
+#define ts_logging u.run.rs_logging
+#define ts_handle_count u.run.rs_handle_count
+#define ts_blocks u.run.rs_blocks
+#define ts_blocks_logged u.run.rs_blocks_logged
+
+#define ts_chp_time u.chp.cs_chp_time
+#define ts_forced_to_close u.chp.cs_forced_to_close
+#define ts_written u.chp.cs_written
+#define ts_dropped u.chp.cs_dropped
+
+#define CURRENT_MSECS (jiffies_to_msecs(jiffies))
+
+static inline unsigned int
+jbd2_time_diff(unsigned int start, unsigned int end)
+{
+ if (unlikely(start > end))
+ end = end + (~0UL - start);
+ else
+ end -= start;
+ return end;
+}
+
/**
* struct journal_s - The journal_s type is the concrete type associated with
* journal_t.
@@ -634,6 +710,12 @@
* @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the
* number that will fit in j_blocksize
* @j_last_sync_writer: most recent pid which did a synchronous write
+ * @j_history: Buffer storing the transactions statistics history
+ * @j_history_max: Maximum number of transactions in the statistics history
+ * @j_history_cur: Current number of transactions in the statistics history
+ * @j_history_lock: Protect the transactions statistics history
+ * @j_proc_entry: procfs entry for the jbd statistics directory
+ * @j_stats: Overall statistics
* @j_private: An opaque pointer to fs-private information.
*/
@@ -826,6 +908,16 @@
pid_t j_last_sync_writer;
/*
+ * Journal statistics
+ */
+ struct transaction_stats_s *j_history;
+ int j_history_max;
+ int j_history_cur;
+ spinlock_t j_history_lock;
+ struct proc_dir_entry *j_proc_entry;
+ struct transaction_stats_s j_stats;
+
+ /*
* An opaque pointer to fs-private information. ext3 puts its
* superblock pointer here
*/
Index: linux-2.6.22-rc4/fs/jbd2/transaction.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/jbd2/transaction.c 2007-06-11 17:22:14.000000000 -0700
+++ linux-2.6.22-rc4/fs/jbd2/transaction.c 2007-06-13 10:47:56.000000000 -0700
@@ -59,6 +59,8 @@
J_ASSERT(journal->j_running_transaction == NULL);
journal->j_running_transaction = transaction;
+ transaction->t_max_wait = 0;
+ transaction->t_start = CURRENT_MSECS;
return transaction;
}
@@ -85,6 +87,7 @@
int nblocks = handle->h_buffer_credits;
transaction_t *new_transaction = NULL;
int ret = 0;
+ unsigned long ts = CURRENT_MSECS;
if (nblocks > journal->j_max_transaction_buffers) {
printk(KERN_ERR "JBD: %s wants too many credits (%d > %d)\n",
@@ -218,6 +221,12 @@
/* OK, account for the buffers that this operation expects to
* use and add the handle to the running transaction. */
+ if (time_after(transaction->t_start, ts)) {
+ ts = jbd2_time_diff(ts, transaction->t_start);
+ if (ts > transaction->t_max_wait)
+ transaction->t_max_wait = ts;
+ }
+
handle->h_transaction = transaction;
transaction->t_outstanding_credits += nblocks;
transaction->t_updates++;
Index: linux-2.6.22-rc4/fs/jbd2/checkpoint.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/jbd2/checkpoint.c 2007-06-11 17:22:14.000000000 -0700
+++ linux-2.6.22-rc4/fs/jbd2/checkpoint.c 2007-06-13 10:48:44.000000000 -0700
@@ -232,7 +232,8 @@
* Called under jbd_lock_bh_state(jh2bh(jh)), and drops it
*/
static int __process_buffer(journal_t *journal, struct journal_head *jh,
- struct buffer_head **bhs, int *batch_count)
+ struct buffer_head **bhs, int *batch_count,
+ transaction_t *transaction)
{
struct buffer_head *bh = jh2bh(jh);
int ret = 0;
@@ -250,6 +251,7 @@
transaction_t *t = jh->b_transaction;
tid_t tid = t->t_tid;
+ transaction->t_chp_stats.cs_forced_to_close++;
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
jbd2_log_start_commit(journal, tid);
@@ -279,6 +281,7 @@
bhs[*batch_count] = bh;
__buffer_relink_io(jh);
jbd_unlock_bh_state(bh);
+ transaction->t_chp_stats.cs_written++;
(*batch_count)++;
if (*batch_count == NR_BATCH) {
spin_unlock(&journal->j_list_lock);
@@ -322,6 +325,8 @@
if (!journal->j_checkpoint_transactions)
goto out;
transaction = journal->j_checkpoint_transactions;
+ if (transaction->t_chp_stats.cs_chp_time == 0)
+ transaction->t_chp_stats.cs_chp_time = CURRENT_MSECS;
this_tid = transaction->t_tid;
restart:
/*
@@ -346,7 +351,8 @@
retry = 1;
break;
}
- retry = __process_buffer(journal, jh, bhs,&batch_count);
+ retry = __process_buffer(journal, jh, bhs, &batch_count,
+ transaction);
if (!retry && lock_need_resched(&journal->j_list_lock)){
spin_unlock(&journal->j_list_lock);
retry = 1;
@@ -668,6 +674,8 @@
void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)
{
+ struct transaction_stats_s stats;
+
assert_spin_locked(&journal->j_list_lock);
if (transaction->t_cpnext) {
transaction->t_cpnext->t_cpprev = transaction->t_cpprev;
@@ -693,5 +701,26 @@
J_ASSERT(journal->j_running_transaction != transaction);
jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
+
+ /*
+ * File the transaction for history
+ */
+ if (transaction->t_chp_stats.cs_written != 0 ||
+ transaction->t_chp_stats.cs_chp_time != 0) {
+ stats.ts_type = JBD2_STATS_CHECKPOINT;
+ stats.ts_tid = transaction->t_tid;
+ stats.u.chp = transaction->t_chp_stats;
+ if (stats.ts_chp_time)
+ stats.ts_chp_time =
+ jbd2_time_diff(stats.ts_chp_time,
+ CURRENT_MSECS);
+ spin_lock(&journal->j_history_lock);
+ memcpy(journal->j_history + journal->j_history_cur, &stats,
+ sizeof(stats));
+ if (++journal->j_history_cur == journal->j_history_max)
+ journal->j_history_cur = 0;
+ spin_unlock(&journal->j_history_lock);
+ }
+
kfree(transaction);
}
Index: linux-2.6.22-rc4/fs/jbd2/commit.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/jbd2/commit.c 2007-06-11 17:22:14.000000000 -0700
+++ linux-2.6.22-rc4/fs/jbd2/commit.c 2007-06-13 10:45:21.000000000 -0700
@@ -20,6 +20,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
+#include <linux/jiffies.h>
/*
* Default IO end handler for temporary BJ_IO buffer_heads.
@@ -290,6 +291,7 @@
*/
void jbd2_journal_commit_transaction(journal_t *journal)
{
+ struct transaction_stats_s stats;
transaction_t *commit_transaction;
struct journal_head *jh, *new_jh, *descriptor;
struct buffer_head **wbuf = journal->j_wbuf;
@@ -337,6 +339,11 @@
spin_lock(&journal->j_state_lock);
commit_transaction->t_state = T_LOCKED;
+ stats.ts_wait = commit_transaction->t_max_wait;
+ stats.ts_locked = CURRENT_MSECS;
+ stats.ts_running = jbd2_time_diff(commit_transaction->t_start,
+ stats.ts_locked);
+
spin_lock(&commit_transaction->t_handle_lock);
while (commit_transaction->t_updates) {
DEFINE_WAIT(wait);
@@ -407,6 +414,9 @@
*/
jbd2_journal_switch_revoke_table(journal);
+ stats.ts_flushing = CURRENT_MSECS;
+ stats.ts_locked = jbd2_time_diff(stats.ts_locked, stats.ts_flushing);
+
commit_transaction->t_state = T_FLUSH;
journal->j_committing_transaction = commit_transaction;
journal->j_running_transaction = NULL;
@@ -498,6 +508,11 @@
*/
commit_transaction->t_state = T_COMMIT;
+ stats.ts_logging = CURRENT_MSECS;
+ stats.ts_flushing = jbd2_time_diff(stats.ts_flushing, stats.ts_logging);
+ stats.ts_blocks = commit_transaction->t_outstanding_credits;
+ stats.ts_blocks_logged = 0;
+
descriptor = NULL;
bufs = 0;
while (commit_transaction->t_buffers) {
@@ -646,6 +661,7 @@
submit_bh(WRITE, bh);
}
cond_resched();
+ stats.ts_blocks_logged += bufs;
/* Force a new descriptor to be generated next
time round the loop. */
@@ -816,6 +832,7 @@
cp_transaction = jh->b_cp_transaction;
if (cp_transaction) {
JBUFFER_TRACE(jh, "remove from old cp transaction");
+ cp_transaction->t_chp_stats.cs_dropped++;
__jbd2_journal_remove_checkpoint(jh);
}
@@ -890,6 +907,36 @@
J_ASSERT(commit_transaction->t_state == T_COMMIT);
+ commit_transaction->t_start = CURRENT_MSECS;
+ stats.ts_logging = jbd2_time_diff(stats.ts_logging,
+ commit_transaction->t_start);
+
+ /*
+ * File the transaction for history
+ */
+ stats.ts_type = JBD2_STATS_RUN;
+ stats.ts_tid = commit_transaction->t_tid;
+ stats.ts_handle_count = commit_transaction->t_handle_count;
+ spin_lock(&journal->j_history_lock);
+ memcpy(journal->j_history + journal->j_history_cur, &stats,
+ sizeof(stats));
+ if (++journal->j_history_cur == journal->j_history_max)
+ journal->j_history_cur = 0;
+
+ /*
+ * Calculate overall stats
+ */
+ journal->j_stats.ts_tid++;
+ journal->j_stats.ts_wait += stats.ts_wait;
+ journal->j_stats.ts_running += stats.ts_running;
+ journal->j_stats.ts_locked += stats.ts_locked;
+ journal->j_stats.ts_flushing += stats.ts_flushing;
+ journal->j_stats.ts_logging += stats.ts_logging;
+ journal->j_stats.ts_handle_count += stats.ts_handle_count;
+ journal->j_stats.ts_blocks += stats.ts_blocks;
+ journal->j_stats.ts_blocks_logged += stats.ts_blocks_logged;
+ spin_unlock(&journal->j_history_lock);
+
commit_transaction->t_state = T_FINISHED;
J_ASSERT(commit_transaction == journal->j_committing_transaction);
journal->j_commit_sequence = commit_transaction->t_tid;
Index: linux-2.6.22-rc4/fs/jbd2/journal.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/jbd2/journal.c 2007-06-11 17:28:17.000000000 -0700
+++ linux-2.6.22-rc4/fs/jbd2/journal.c 2007-06-13 12:11:49.000000000 -0700
@@ -36,6 +36,7 @@
#include <linux/poison.h>
#include <linux/proc_fs.h>
#include <linux/debugfs.h>
+#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@@ -641,6 +642,306 @@
return jbd2_journal_add_journal_head(bh);
}
+struct jbd2_stats_proc_session {
+ journal_t *journal;
+ struct transaction_stats_s *stats;
+ int start;
+ int max;
+};
+
+static void *jbd2_history_skip_empty(struct jbd2_stats_proc_session *s,
+ struct transaction_stats_s *ts,
+ int first)
+{
+ if (ts == s->stats + s->max)
+ ts = s->stats;
+ if (!first && ts == s->stats + s->start)
+ return NULL;
+ while (ts->ts_type == 0) {
+ ts++;
+ if (ts == s->stats + s->max)
+ ts = s->stats;
+ if (ts == s->stats + s->start)
+ return NULL;
+ }
+ return ts;
+
+}
+
+static void *jbd2_seq_history_start(struct seq_file *seq, loff_t *pos)
+{
+ struct jbd2_stats_proc_session *s = seq->private;
+ struct transaction_stats_s *ts;
+ int l = *pos;
+
+ if (l == 0)
+ return SEQ_START_TOKEN;
+ ts = jbd2_history_skip_empty(s, s->stats + s->start, 1);
+ if (!ts)
+ return NULL;
+ l--;
+ while (l) {
+ ts = jbd2_history_skip_empty(s, ++ts, 0);
+ if (!ts)
+ break;
+ l--;
+ }
+ return ts;
+}
+
+static void *jbd2_seq_history_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct jbd2_stats_proc_session *s = seq->private;
+ struct transaction_stats_s *ts = v;
+
+ ++*pos;
+ if (v == SEQ_START_TOKEN)
+ return jbd2_history_skip_empty(s, s->stats + s->start, 1);
+ else
+ return jbd2_history_skip_empty(s, ++ts, 0);
+}
+
+static int jbd2_seq_history_show(struct seq_file *seq, void *v)
+{
+ struct transaction_stats_s *ts = v;
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq, "%-4s %-5s %-5s %-5s %-5s %-5s %-5s %-6s %-5s "
+ "%-5s %-5s %-5s %-5s %-5s\n", "R/C", "tid",
+ "wait", "run", "lock", "flush", "log", "hndls",
+ "block", "inlog", "ctime", "write", "drop",
+ "close");
+ return 0;
+ }
+ if (ts->ts_type == JBD2_STATS_RUN)
+ seq_printf(seq, "%-4s %-5lu %-5lu %-5lu %-5lu %-5lu %-5lu "
+ "%-6lu %-5lu %-5lu\n", "R", ts->ts_tid,
+ ts->ts_wait, ts->ts_running, ts->ts_locked,
+ ts->ts_flushing, ts->ts_logging,
+ ts->ts_handle_count, ts->ts_blocks,
+ ts->ts_blocks_logged);
+ else if (ts->ts_type == JBD2_STATS_CHECKPOINT)
+ seq_printf(seq, "%-4s %-5lu %48s %-5lu %-5lu %-5lu %-5lu\n",
+ "C", ts->ts_tid, " ", ts->ts_chp_time,
+ ts->ts_written, ts->ts_dropped,
+ ts->ts_forced_to_close);
+ else
+ J_ASSERT(0);
+ return 0;
+}
+
+static void jbd2_seq_history_stop(struct seq_file *seq, void *v)
+{
+}
+
+static struct seq_operations jbd2_seq_history_ops = {
+ .start = jbd2_seq_history_start,
+ .next = jbd2_seq_history_next,
+ .stop = jbd2_seq_history_stop,
+ .show = jbd2_seq_history_show,
+};
+
+static int jbd2_seq_history_open(struct inode *inode, struct file *file)
+{
+ journal_t *journal = PDE(inode)->data;
+ struct jbd2_stats_proc_session *s;
+ int rc, size;
+
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (s == NULL)
+ return -EIO;
+ size = sizeof(struct transaction_stats_s) * journal->j_history_max;
+ s->stats = kmalloc(size, GFP_KERNEL);
+ if (s == NULL) {
+ kfree(s);
+ return -EIO;
+ }
+ spin_lock(&journal->j_history_lock);
+ memcpy(s->stats, journal->j_history, size);
+ s->max = journal->j_history_max;
+ s->start = journal->j_history_cur % s->max;
+ spin_unlock(&journal->j_history_lock);
+
+ rc = seq_open(file, &jbd2_seq_history_ops);
+ if (rc == 0) {
+ struct seq_file *m = (struct seq_file *)file->private_data;
+ m->private = s;
+ } else {
+ kfree(s->stats);
+ kfree(s);
+ }
+ return rc;
+
+}
+
+static int jbd2_seq_history_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *)file->private_data;
+ struct jbd2_stats_proc_session *s = seq->private;
+ kfree(s->stats);
+ kfree(s);
+ return seq_release(inode, file);
+}
+
+static struct file_operations jbd2_seq_history_fops = {
+ .owner = THIS_MODULE,
+ .open = jbd2_seq_history_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = jbd2_seq_history_release,
+};
+
+static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos)
+{
+ return *pos ? NULL : SEQ_START_TOKEN;
+}
+
+static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ return NULL;
+}
+
+static int jbd2_seq_info_show(struct seq_file *seq, void *v)
+{
+ struct jbd2_stats_proc_session *s = seq->private;
+ if (v != SEQ_START_TOKEN)
+ return 0;
+ seq_printf(seq, "%lu transaction, each upto %u blocks\n",
+ s->stats->ts_tid,
+ s->journal->j_max_transaction_buffers);
+ if (s->stats->ts_tid == 0)
+ return 0;
+ seq_printf(seq, "average: \n %lums waiting for transaction\n",
+ s->stats->ts_wait / s->stats->ts_tid);
+ seq_printf(seq, " %lums running transaction\n",
+ s->stats->ts_running / s->stats->ts_tid);
+ seq_printf(seq, " %lums transaction was being locked\n",
+ s->stats->ts_locked / s->stats->ts_tid);
+ seq_printf(seq, " %lums flushing data (in ordered mode)\n",
+ s->stats->ts_flushing / s->stats->ts_tid);
+ seq_printf(seq, " %lums logging transaction\n",
+ s->stats->ts_logging / s->stats->ts_tid);
+ seq_printf(seq, " %lu handles per transaction\n",
+ s->stats->ts_handle_count / s->stats->ts_tid);
+ seq_printf(seq, " %lu blocks per transaction\n",
+ s->stats->ts_blocks / s->stats->ts_tid);
+ seq_printf(seq, " %lu logged blocks per transaction\n",
+ s->stats->ts_blocks_logged / s->stats->ts_tid);
+ return 0;
+}
+
+static void jbd2_seq_info_stop(struct seq_file *seq, void *v)
+{
+}
+
+static struct seq_operations jbd2_seq_info_ops = {
+ .start = jbd2_seq_info_start,
+ .next = jbd2_seq_info_next,
+ .stop = jbd2_seq_info_stop,
+ .show = jbd2_seq_info_show,
+};
+
+static int jbd2_seq_info_open(struct inode *inode, struct file *file)
+{
+ journal_t *journal = PDE(inode)->data;
+ struct jbd2_stats_proc_session *s;
+ int rc, size;
+
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (s == NULL)
+ return -EIO;
+ size = sizeof(struct transaction_stats_s);
+ s->stats = kmalloc(size, GFP_KERNEL);
+ if (s == NULL) {
+ kfree(s);
+ return -EIO;
+ }
+ spin_lock(&journal->j_history_lock);
+ memcpy(s->stats, &journal->j_stats, size);
+ s->journal = journal;
+ spin_unlock(&journal->j_history_lock);
+
+ rc = seq_open(file, &jbd2_seq_info_ops);
+ if (rc == 0) {
+ struct seq_file *m = (struct seq_file *)file->private_data;
+ m->private = s;
+ } else {
+ kfree(s->stats);
+ kfree(s);
+ }
+ return rc;
+
+}
+
+static int jbd2_seq_info_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *)file->private_data;
+ struct jbd2_stats_proc_session *s = seq->private;
+ kfree(s->stats);
+ kfree(s);
+ return seq_release(inode, file);
+}
+
+static struct file_operations jbd2_seq_info_fops = {
+ .owner = THIS_MODULE,
+ .open = jbd2_seq_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = jbd2_seq_info_release,
+};
+
+static struct proc_dir_entry *proc_jbd2_stats = NULL;
+
+static void jbd2_stats_proc_init(journal_t *journal)
+{
+ char name[64];
+
+ snprintf(name, sizeof(name) - 1, "%s", bdevname(journal->j_dev, name));
+ journal->j_proc_entry = proc_mkdir(name, proc_jbd2_stats);
+ if (journal->j_proc_entry) {
+ struct proc_dir_entry *p;
+ p = create_proc_entry("history", S_IRUGO,
+ journal->j_proc_entry);
+ if (p) {
+ p->proc_fops = &jbd2_seq_history_fops;
+ p->data = journal;
+ p = create_proc_entry("info", S_IRUGO,
+ journal->j_proc_entry);
+ if (p) {
+ p->proc_fops = &jbd2_seq_info_fops;
+ p->data = journal;
+ }
+ }
+ }
+}
+
+static void jbd2_stats_proc_exit(journal_t *journal)
+{
+ char name[64];
+
+ snprintf(name, sizeof(name) - 1, "%s", bdevname(journal->j_dev, name));
+ remove_proc_entry("info", journal->j_proc_entry);
+ remove_proc_entry("history", journal->j_proc_entry);
+ remove_proc_entry(name, proc_jbd2_stats);
+}
+
+static void journal_init_stats(journal_t *journal)
+{
+ int size;
+
+ if (proc_jbd2_stats == NULL)
+ return;
+
+ journal->j_history_max = 100;
+ size = sizeof(struct transaction_stats_s) * journal->j_history_max;
+ journal->j_history = kmalloc(size, GFP_KERNEL);
+ if (journal->j_history == NULL) {
+ journal->j_history_max = 0;
+ return;
+ }
+ memset(journal->j_history, 0, size);
+ spin_lock_init(&journal->j_history_lock);
+}
+
/*
* Management for journal control blocks: functions to create and
* destroy journal_t structures, and to initialise and read existing
@@ -683,6 +984,9 @@
kfree(journal);
goto fail;
}
+
+ journal_init_stats(journal);
+
return journal;
fail:
return NULL;
@@ -733,6 +1037,7 @@
journal = NULL;
goto out;
}
+ jbd2_stats_proc_init(journal);
journal->j_dev = bdev;
journal->j_fs_dev = fs_dev;
journal->j_blk_offset = start;
@@ -775,6 +1080,7 @@
journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits;
journal->j_blocksize = inode->i_sb->s_blocksize;
+ jbd2_stats_proc_init(journal);
/* journal descriptor can store up to n blocks -bzzz */
n = journal->j_blocksize / sizeof(journal_block_tag_t);
@@ -1162,6 +1468,8 @@
brelse(journal->j_sb_buffer);
}
+ if (journal->j_proc_entry)
+ jbd2_stats_proc_exit(journal);
if (journal->j_inode)
iput(journal->j_inode);
if (journal->j_revoke)
@@ -1989,6 +2297,28 @@
#endif
+#if defined(CONFIG_PROC_FS)
+
+#define JBD2_STATS_PROC_NAME "fs/jbd2"
+
+static void __init jbd2_create_jbd_stats_proc_entry(void)
+{
+ proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL);
+}
+
+static void __exit jbd2_remove_jbd_stats_proc_entry(void)
+{
+ if (proc_jbd2_stats)
+ remove_proc_entry(JBD2_STATS_PROC_NAME, NULL);
+}
+
+#else
+
+#define jbd2_create_jbd_stats_proc_entry() do {} while (0)
+#define jbd2_remove_jbd_stats_proc_entry() do {} while (0)
+
+#endif
+
struct kmem_cache *jbd2_handle_cache;
static int __init journal_init_handle_cache(void)
@@ -2046,6 +2376,7 @@
if (ret != 0)
jbd2_journal_destroy_caches();
jbd2_create_debugfs_entry();
+ jbd2_create_jbd_stats_proc_entry();
return ret;
}
@@ -2057,6 +2388,7 @@
printk(KERN_EMERG "JBD: leaked %d journal_heads!\n", n);
#endif
jbd2_remove_debugfs_entry();
+ jbd2_remove_jbd_stats_proc_entry();
jbd2_journal_destroy_caches();
}
-
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