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authorSunil Mushran <sunil.mushran@oracle.com>2008-12-17 14:17:43 -0800
committerMark Fasheh <mfasheh@suse.com>2009-04-03 11:39:15 -0700
commit50397507e856455b3f5cb3d5c7c482209f9e46a0 (patch)
tree537d1aa6aec9108aa080a2b58f68fac767420416
parent96a6c64b5354b804b3ccfd1b31306565a01ebcb1 (diff)
ocfs2: Expose the file system state via debugfs
This patch creates a per mount debugfs file, fs_state, which exposes information like, cluster stack in use, states of the downconvert, recovery and commit threads, number of journal txns, some allocation stats, list of all slots, etc. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
-rw-r--r--fs/ocfs2/ocfs2.h1
-rw-r--r--fs/ocfs2/super.c176
2 files changed, 177 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 946d3c34b90..18d8542a615 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -308,6 +308,7 @@ struct ocfs2_super
struct ocfs2_dlm_debug *osb_dlm_debug;
struct dentry *osb_debug_root;
+ struct dentry *osb_ctxt;
wait_queue_head_t recovery_event;
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 7ac83a81ee5..4eaf0e602bd 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -201,6 +201,170 @@ static const match_table_t tokens = {
{Opt_err, NULL}
};
+#ifdef CONFIG_DEBUG_FS
+static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
+{
+ int out = 0;
+ int i;
+ struct ocfs2_cluster_connection *cconn = osb->cconn;
+ struct ocfs2_recovery_map *rm = osb->recovery_map;
+
+ out += snprintf(buf + out, len - out,
+ "%10s => Id: %-s Uuid: %-s Gen: 0x%X Label: %-s\n",
+ "Device", osb->dev_str, osb->uuid_str,
+ osb->fs_generation, osb->vol_label);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => State: %d Flags: 0x%lX\n", "Volume",
+ atomic_read(&osb->vol_state), osb->osb_flags);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => Block: %lu Cluster: %d\n", "Sizes",
+ osb->sb->s_blocksize, osb->s_clustersize);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => Compat: 0x%X Incompat: 0x%X "
+ "ROcompat: 0x%X\n",
+ "Features", osb->s_feature_compat,
+ osb->s_feature_incompat, osb->s_feature_ro_compat);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => Opts: 0x%lX AtimeQuanta: %u\n", "Mount",
+ osb->s_mount_opt, osb->s_atime_quantum);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => Stack: %s Name: %*s Version: %d.%d\n",
+ "Cluster",
+ (*osb->osb_cluster_stack == '\0' ?
+ "o2cb" : osb->osb_cluster_stack),
+ cconn->cc_namelen, cconn->cc_name,
+ cconn->cc_version.pv_major, cconn->cc_version.pv_minor);
+
+ spin_lock(&osb->dc_task_lock);
+ out += snprintf(buf + out, len - out,
+ "%10s => Pid: %d Count: %lu WakeSeq: %lu "
+ "WorkSeq: %lu\n", "DownCnvt",
+ task_pid_nr(osb->dc_task), osb->blocked_lock_count,
+ osb->dc_wake_sequence, osb->dc_work_sequence);
+ spin_unlock(&osb->dc_task_lock);
+
+ spin_lock(&osb->osb_lock);
+ out += snprintf(buf + out, len - out, "%10s => Pid: %d Nodes:",
+ "Recovery",
+ (osb->recovery_thread_task ?
+ task_pid_nr(osb->recovery_thread_task) : -1));
+ if (rm->rm_used == 0)
+ out += snprintf(buf + out, len - out, " None\n");
+ else {
+ for (i = 0; i < rm->rm_used; i++)
+ out += snprintf(buf + out, len - out, " %d",
+ rm->rm_entries[i]);
+ out += snprintf(buf + out, len - out, "\n");
+ }
+ spin_unlock(&osb->osb_lock);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => Pid: %d Interval: %lu Needs: %d\n", "Commit",
+ task_pid_nr(osb->commit_task), osb->osb_commit_interval,
+ atomic_read(&osb->needs_checkpoint));
+
+ out += snprintf(buf + out, len - out,
+ "%10s => State: %d NumTxns: %d TxnId: %lu\n",
+ "Journal", osb->journal->j_state,
+ atomic_read(&osb->journal->j_num_trans),
+ osb->journal->j_trans_id);
+
+ out += snprintf(buf + out, len - out,
+ "%10s => GlobalAllocs: %d LocalAllocs: %d "
+ "SubAllocs: %d LAWinMoves: %d SAExtends: %d\n",
+ "Stats",
+ atomic_read(&osb->alloc_stats.bitmap_data),
+ atomic_read(&osb->alloc_stats.local_data),
+ atomic_read(&osb->alloc_stats.bg_allocs),
+ atomic_read(&osb->alloc_stats.moves),
+ atomic_read(&osb->alloc_stats.bg_extends));
+
+ out += snprintf(buf + out, len - out,
+ "%10s => State: %u Descriptor: %llu Size: %u bits "
+ "Default: %u bits\n",
+ "LocalAlloc", osb->local_alloc_state,
+ (unsigned long long)osb->la_last_gd,
+ osb->local_alloc_bits, osb->local_alloc_default_bits);
+
+ spin_lock(&osb->osb_lock);
+ out += snprintf(buf + out, len - out,
+ "%10s => Slot: %d NumStolen: %d\n", "Steal",
+ osb->s_inode_steal_slot,
+ atomic_read(&osb->s_num_inodes_stolen));
+ spin_unlock(&osb->osb_lock);
+
+ out += snprintf(buf + out, len - out, "%10s => %3s %10s\n",
+ "Slots", "Num", "RecoGen");
+
+ for (i = 0; i < osb->max_slots; ++i) {
+ out += snprintf(buf + out, len - out,
+ "%10s %c %3d %10d\n",
+ " ",
+ (i == osb->slot_num ? '*' : ' '),
+ i, osb->slot_recovery_generations[i]);
+ }
+
+ return out;
+}
+
+static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
+{
+ struct ocfs2_super *osb = inode->i_private;
+ char *buf = NULL;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ goto bail;
+
+ i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
+
+ file->private_data = buf;
+
+ return 0;
+bail:
+ return -ENOMEM;
+}
+
+static int ocfs2_debug_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+ i_size_read(file->f_mapping->host));
+}
+#else
+static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+static int ocfs2_debug_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static struct file_operations ocfs2_osb_debug_fops = {
+ .open = ocfs2_osb_debug_open,
+ .release = ocfs2_debug_release,
+ .read = ocfs2_debug_read,
+ .llseek = generic_file_llseek,
+};
+
/*
* write_super and sync_fs ripped right out of ext3.
*/
@@ -926,6 +1090,16 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
goto read_super_error;
}
+ osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
+ osb->osb_debug_root,
+ osb,
+ &ocfs2_osb_debug_fops);
+ if (!osb->osb_ctxt) {
+ status = -EINVAL;
+ mlog_errno(status);
+ goto read_super_error;
+ }
+
status = ocfs2_mount_volume(sb);
if (osb->root_inode)
inode = igrab(osb->root_inode);
@@ -1620,6 +1794,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
osb = OCFS2_SB(sb);
BUG_ON(!osb);
+ debugfs_remove(osb->osb_ctxt);
+
ocfs2_disable_quotas(osb);
ocfs2_shutdown_local_alloc(osb);