#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>
EXPORT_SYMBOL(jbd2_journal_get_write_access);
EXPORT_SYMBOL(jbd2_journal_get_create_access);
EXPORT_SYMBOL(jbd2_journal_get_undo_access);
-EXPORT_SYMBOL(jbd2_journal_dirty_data);
EXPORT_SYMBOL(jbd2_journal_dirty_metadata);
EXPORT_SYMBOL(jbd2_journal_release_buffer);
EXPORT_SYMBOL(jbd2_journal_forget);
EXPORT_SYMBOL(jbd2_journal_create);
EXPORT_SYMBOL(jbd2_journal_load);
EXPORT_SYMBOL(jbd2_journal_destroy);
-EXPORT_SYMBOL(jbd2_journal_update_superblock);
EXPORT_SYMBOL(jbd2_journal_abort);
EXPORT_SYMBOL(jbd2_journal_errno);
EXPORT_SYMBOL(jbd2_journal_ack_err);
EXPORT_SYMBOL(jbd2_journal_invalidatepage);
EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers);
EXPORT_SYMBOL(jbd2_journal_force_commit);
+EXPORT_SYMBOL(jbd2_journal_file_inode);
+EXPORT_SYMBOL(jbd2_journal_init_jbd_inode);
+EXPORT_SYMBOL(jbd2_journal_release_jbd_inode);
+EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate);
static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *);
static void __journal_abort_soft (journal_t *journal, int errno);
if (IS_ERR(t))
return PTR_ERR(t);
- wait_event(journal->j_wait_done_commit, journal->j_task != 0);
+ wait_event(journal->j_wait_done_commit, journal->j_task != NULL);
return 0;
}
while (journal->j_task) {
wake_up(&journal->j_wait_commit);
spin_unlock(&journal->j_state_lock);
- wait_event(journal->j_wait_done_commit, journal->j_task == 0);
+ wait_event(journal->j_wait_done_commit, journal->j_task == NULL);
spin_lock(&journal->j_state_lock);
}
spin_unlock(&journal->j_state_lock);
if (!tid_geq(journal->j_commit_request, tid)) {
printk(KERN_EMERG
"%s: error: j_commit_request=%d, tid=%d\n",
- __FUNCTION__, journal->j_commit_request, tid);
+ __func__, journal->j_commit_request, tid);
}
spin_unlock(&journal->j_state_lock);
#endif
printk(KERN_ALERT "%s: journal block not found "
"at offset %lu on %s\n",
- __FUNCTION__,
+ __func__,
blocknr,
bdevname(journal->j_dev, b));
err = -EIO;
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 %-5u %-5u %-5u %-5u %-5u "
+ "%-6lu %-5lu %-5lu\n", "R", ts->ts_tid,
+ jiffies_to_msecs(ts->u.run.rs_wait),
+ jiffies_to_msecs(ts->u.run.rs_running),
+ jiffies_to_msecs(ts->u.run.rs_locked),
+ jiffies_to_msecs(ts->u.run.rs_flushing),
+ jiffies_to_msecs(ts->u.run.rs_logging),
+ ts->u.run.rs_handle_count,
+ ts->u.run.rs_blocks,
+ ts->u.run.rs_blocks_logged);
+ else if (ts->ts_type == JBD2_STATS_CHECKPOINT)
+ seq_printf(seq, "%-4s %-5lu %48s %-5u %-5lu %-5lu %-5lu\n",
+ "C", ts->ts_tid, " ",
+ jiffies_to_msecs(ts->u.chp.cs_chp_time),
+ ts->u.chp.cs_written, ts->u.chp.cs_dropped,
+ ts->u.chp.cs_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 -ENOMEM;
+ size = sizeof(struct transaction_stats_s) * journal->j_history_max;
+ s->stats = kmalloc(size, GFP_KERNEL);
+ if (s->stats == NULL) {
+ kfree(s);
+ return -ENOMEM;
+ }
+ 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 = 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 = 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 %ums waiting for transaction\n",
+ jiffies_to_msecs(s->stats->u.run.rs_wait / s->stats->ts_tid));
+ seq_printf(seq, " %ums running transaction\n",
+ jiffies_to_msecs(s->stats->u.run.rs_running / s->stats->ts_tid));
+ seq_printf(seq, " %ums transaction was being locked\n",
+ jiffies_to_msecs(s->stats->u.run.rs_locked / s->stats->ts_tid));
+ seq_printf(seq, " %ums flushing data (in ordered mode)\n",
+ jiffies_to_msecs(s->stats->u.run.rs_flushing / s->stats->ts_tid));
+ seq_printf(seq, " %ums logging transaction\n",
+ jiffies_to_msecs(s->stats->u.run.rs_logging / s->stats->ts_tid));
+ seq_printf(seq, " %lu handles per transaction\n",
+ s->stats->u.run.rs_handle_count / s->stats->ts_tid);
+ seq_printf(seq, " %lu blocks per transaction\n",
+ s->stats->u.run.rs_blocks / s->stats->ts_tid);
+ seq_printf(seq, " %lu logged blocks per transaction\n",
+ s->stats->u.run.rs_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 -ENOMEM;
+ size = sizeof(struct transaction_stats_s);
+ s->stats = kmalloc(size, GFP_KERNEL);
+ if (s->stats == NULL) {
+ kfree(s);
+ return -ENOMEM;
+ }
+ 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 = 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 = 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;
+
+static void jbd2_stats_proc_init(journal_t *journal)
+{
+ char name[BDEVNAME_SIZE];
+
+ bdevname(journal->j_dev, name);
+ journal->j_proc_entry = proc_mkdir(name, proc_jbd2_stats);
+ if (journal->j_proc_entry) {
+ proc_create_data("history", S_IRUGO, journal->j_proc_entry,
+ &jbd2_seq_history_fops, journal);
+ proc_create_data("info", S_IRUGO, journal->j_proc_entry,
+ &jbd2_seq_info_fops, journal);
+ }
+}
+
+static void jbd2_stats_proc_exit(journal_t *journal)
+{
+ char name[BDEVNAME_SIZE];
+
+ 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)
+ return;
+
+ journal->j_history_max = 100;
+ size = sizeof(struct transaction_stats_s) * journal->j_history_max;
+ journal->j_history = kzalloc(size, GFP_KERNEL);
+ if (!journal->j_history) {
+ journal->j_history_max = 0;
+ return;
+ }
+ 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
kfree(journal);
goto fail;
}
+
+ journal_init_stats(journal);
+
return journal;
fail:
return NULL;
*/
/**
- * journal_t * jbd2_journal_init_dev() - creates an initialises a journal structure
+ * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure
* @bdev: Block device on which to create the journal
* @fs_dev: Device which hold journalled filesystem for this journal.
* @start: Block nr Start of journal.
* @len: Length of the journal in blocks.
* @blocksize: blocksize of journalling device
- * @returns: a newly created journal_t *
+ *
+ * Returns: a newly created journal_t *
*
* jbd2_journal_init_dev creates a journal which maps a fixed contiguous
* range of blocks on an arbitrary block device.
journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
if (!journal->j_wbuf) {
printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
- __FUNCTION__);
+ __func__);
kfree(journal);
journal = NULL;
goto out;
journal->j_fs_dev = fs_dev;
journal->j_blk_offset = start;
journal->j_maxlen = len;
+ jbd2_stats_proc_init(journal);
bh = __getblk(journal->j_dev, start, journal->j_blocksize);
J_ASSERT(bh != NULL);
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);
journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
if (!journal->j_wbuf) {
printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
- __FUNCTION__);
+ __func__);
kfree(journal);
return NULL;
}
/* If that failed, give up */
if (err) {
printk(KERN_ERR "%s: Cannnot locate journal superblock\n",
- __FUNCTION__);
+ __func__);
kfree(journal);
return NULL;
}
*/
printk(KERN_EMERG
"%s: creation of journal on external device!\n",
- __FUNCTION__);
+ __func__);
BUG();
}
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)
return 1;
}
+/*
+ * jbd2_journal_clear_features () - Clear a given journal feature in the
+ * superblock
+ * @journal: Journal to act on.
+ * @compat: bitmask of compatible features
+ * @ro: bitmask of features that force read-only mount
+ * @incompat: bitmask of incompatible features
+ *
+ * Clear a given journal feature as present on the
+ * superblock.
+ */
+void jbd2_journal_clear_features(journal_t *journal, unsigned long compat,
+ unsigned long ro, unsigned long incompat)
+{
+ journal_superblock_t *sb;
+
+ jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n",
+ compat, ro, incompat);
+
+ sb = journal->j_superblock;
+
+ sb->s_feature_compat &= ~cpu_to_be32(compat);
+ sb->s_feature_ro_compat &= ~cpu_to_be32(ro);
+ sb->s_feature_incompat &= ~cpu_to_be32(incompat);
+}
+EXPORT_SYMBOL(jbd2_journal_clear_features);
/**
* int jbd2_journal_update_format () - Update on-disk journal structure.
{
int retval;
- J_ASSERT(jbd2_journal_head_cache == 0);
+ J_ASSERT(jbd2_journal_head_cache == NULL);
jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head",
sizeof(struct journal_head),
0, /* offset */
- 0, /* flags */
+ SLAB_TEMPORARY, /* flags */
NULL); /* ctor */
retval = 0;
- if (jbd2_journal_head_cache == 0) {
+ if (!jbd2_journal_head_cache) {
retval = -ENOMEM;
printk(KERN_EMERG "JBD: no memory for journal_head cache\n");
}
static void jbd2_journal_destroy_jbd2_journal_head_cache(void)
{
- J_ASSERT(jbd2_journal_head_cache != NULL);
- kmem_cache_destroy(jbd2_journal_head_cache);
- jbd2_journal_head_cache = NULL;
+ if (jbd2_journal_head_cache) {
+ kmem_cache_destroy(jbd2_journal_head_cache);
+ jbd2_journal_head_cache = NULL;
+ }
}
/*
atomic_inc(&nr_journal_heads);
#endif
ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS);
- if (ret == 0) {
+ if (!ret) {
jbd_debug(1, "out of memory for journal_head\n");
if (time_after(jiffies, last_warning + 5*HZ)) {
printk(KERN_NOTICE "ENOMEM in %s, retrying.\n",
- __FUNCTION__);
+ __func__);
last_warning = jiffies;
}
- while (ret == 0) {
+ while (!ret) {
yield();
ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS);
}
if (jh->b_frozen_data) {
printk(KERN_WARNING "%s: freeing "
"b_frozen_data\n",
- __FUNCTION__);
+ __func__);
jbd2_free(jh->b_frozen_data, bh->b_size);
}
if (jh->b_committed_data) {
printk(KERN_WARNING "%s: freeing "
"b_committed_data\n",
- __FUNCTION__);
+ __func__);
jbd2_free(jh->b_committed_data, bh->b_size);
}
bh->b_private = NULL;
jbd_unlock_bh_journal_head(bh);
}
+/*
+ * Initialize jbd inode head
+ */
+void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode)
+{
+ jinode->i_transaction = NULL;
+ jinode->i_next_transaction = NULL;
+ jinode->i_vfs_inode = inode;
+ jinode->i_flags = 0;
+ INIT_LIST_HEAD(&jinode->i_list);
+}
+
+/*
+ * Function to be called before we start removing inode from memory (i.e.,
+ * clear_inode() is a fine place to be called from). It removes inode from
+ * transaction's lists.
+ */
+void jbd2_journal_release_jbd_inode(journal_t *journal,
+ struct jbd2_inode *jinode)
+{
+ int writeout = 0;
+
+ if (!journal)
+ return;
+restart:
+ spin_lock(&journal->j_list_lock);
+ /* Is commit writing out inode - we have to wait */
+ if (jinode->i_flags & JI_COMMIT_RUNNING) {
+ wait_queue_head_t *wq;
+ DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING);
+ wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING);
+ prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
+ spin_unlock(&journal->j_list_lock);
+ schedule();
+ finish_wait(wq, &wait.wait);
+ goto restart;
+ }
+
+ /* Do we need to wait for data writeback? */
+ if (journal->j_committing_transaction == jinode->i_transaction)
+ writeout = 1;
+ if (jinode->i_transaction) {
+ list_del(&jinode->i_list);
+ jinode->i_transaction = NULL;
+ }
+ spin_unlock(&journal->j_list_lock);
+}
+
/*
* debugfs tunables
*/
#endif
+#ifdef 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)
jbd2_handle_cache = kmem_cache_create("jbd2_journal_handle",
sizeof(handle_t),
0, /* offset */
- 0, /* flags */
+ SLAB_TEMPORARY, /* flags */
NULL); /* ctor */
if (jbd2_handle_cache == NULL) {
printk(KERN_EMERG "JBD: failed to create handle cache\n");
BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024);
ret = journal_init_caches();
- if (ret != 0)
+ if (ret == 0) {
+ jbd2_create_debugfs_entry();
+ jbd2_create_jbd_stats_proc_entry();
+ } else {
jbd2_journal_destroy_caches();
- jbd2_create_debugfs_entry();
+ }
return ret;
}
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();
}