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>
This commit is contained in:
Sunil Mushran
Mark Fasheh
parent
96a6c64b53
commit
50397507e8
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@ -308,6 +308,7 @@ struct ocfs2_super
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struct ocfs2_dlm_debug *osb_dlm_debug;
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struct dentry *osb_debug_root;
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struct dentry *osb_ctxt;
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wait_queue_head_t recovery_event;
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176
fs/ocfs2/super.c
176
fs/ocfs2/super.c
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@ -201,6 +201,170 @@ static const match_table_t tokens = {
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{Opt_err, NULL}
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};
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#ifdef CONFIG_DEBUG_FS
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static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
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{
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int out = 0;
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int i;
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struct ocfs2_cluster_connection *cconn = osb->cconn;
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struct ocfs2_recovery_map *rm = osb->recovery_map;
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out += snprintf(buf + out, len - out,
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"%10s => Id: %-s Uuid: %-s Gen: 0x%X Label: %-s\n",
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"Device", osb->dev_str, osb->uuid_str,
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osb->fs_generation, osb->vol_label);
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out += snprintf(buf + out, len - out,
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"%10s => State: %d Flags: 0x%lX\n", "Volume",
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atomic_read(&osb->vol_state), osb->osb_flags);
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out += snprintf(buf + out, len - out,
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"%10s => Block: %lu Cluster: %d\n", "Sizes",
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osb->sb->s_blocksize, osb->s_clustersize);
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out += snprintf(buf + out, len - out,
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"%10s => Compat: 0x%X Incompat: 0x%X "
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"ROcompat: 0x%X\n",
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"Features", osb->s_feature_compat,
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osb->s_feature_incompat, osb->s_feature_ro_compat);
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out += snprintf(buf + out, len - out,
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"%10s => Opts: 0x%lX AtimeQuanta: %u\n", "Mount",
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osb->s_mount_opt, osb->s_atime_quantum);
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out += snprintf(buf + out, len - out,
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"%10s => Stack: %s Name: %*s Version: %d.%d\n",
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"Cluster",
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(*osb->osb_cluster_stack == '\0' ?
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"o2cb" : osb->osb_cluster_stack),
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cconn->cc_namelen, cconn->cc_name,
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cconn->cc_version.pv_major, cconn->cc_version.pv_minor);
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spin_lock(&osb->dc_task_lock);
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out += snprintf(buf + out, len - out,
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"%10s => Pid: %d Count: %lu WakeSeq: %lu "
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"WorkSeq: %lu\n", "DownCnvt",
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task_pid_nr(osb->dc_task), osb->blocked_lock_count,
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osb->dc_wake_sequence, osb->dc_work_sequence);
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spin_unlock(&osb->dc_task_lock);
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spin_lock(&osb->osb_lock);
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out += snprintf(buf + out, len - out, "%10s => Pid: %d Nodes:",
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"Recovery",
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(osb->recovery_thread_task ?
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task_pid_nr(osb->recovery_thread_task) : -1));
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if (rm->rm_used == 0)
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out += snprintf(buf + out, len - out, " None\n");
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else {
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for (i = 0; i < rm->rm_used; i++)
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out += snprintf(buf + out, len - out, " %d",
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rm->rm_entries[i]);
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out += snprintf(buf + out, len - out, "\n");
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}
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spin_unlock(&osb->osb_lock);
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out += snprintf(buf + out, len - out,
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"%10s => Pid: %d Interval: %lu Needs: %d\n", "Commit",
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task_pid_nr(osb->commit_task), osb->osb_commit_interval,
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atomic_read(&osb->needs_checkpoint));
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out += snprintf(buf + out, len - out,
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"%10s => State: %d NumTxns: %d TxnId: %lu\n",
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"Journal", osb->journal->j_state,
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atomic_read(&osb->journal->j_num_trans),
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osb->journal->j_trans_id);
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out += snprintf(buf + out, len - out,
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"%10s => GlobalAllocs: %d LocalAllocs: %d "
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"SubAllocs: %d LAWinMoves: %d SAExtends: %d\n",
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"Stats",
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atomic_read(&osb->alloc_stats.bitmap_data),
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atomic_read(&osb->alloc_stats.local_data),
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atomic_read(&osb->alloc_stats.bg_allocs),
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atomic_read(&osb->alloc_stats.moves),
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atomic_read(&osb->alloc_stats.bg_extends));
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out += snprintf(buf + out, len - out,
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"%10s => State: %u Descriptor: %llu Size: %u bits "
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"Default: %u bits\n",
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"LocalAlloc", osb->local_alloc_state,
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(unsigned long long)osb->la_last_gd,
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osb->local_alloc_bits, osb->local_alloc_default_bits);
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spin_lock(&osb->osb_lock);
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out += snprintf(buf + out, len - out,
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"%10s => Slot: %d NumStolen: %d\n", "Steal",
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osb->s_inode_steal_slot,
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atomic_read(&osb->s_num_inodes_stolen));
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spin_unlock(&osb->osb_lock);
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out += snprintf(buf + out, len - out, "%10s => %3s %10s\n",
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"Slots", "Num", "RecoGen");
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for (i = 0; i < osb->max_slots; ++i) {
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out += snprintf(buf + out, len - out,
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"%10s %c %3d %10d\n",
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" ",
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(i == osb->slot_num ? '*' : ' '),
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i, osb->slot_recovery_generations[i]);
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}
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return out;
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}
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static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
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{
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struct ocfs2_super *osb = inode->i_private;
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char *buf = NULL;
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buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!buf)
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goto bail;
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i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
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file->private_data = buf;
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return 0;
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bail:
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return -ENOMEM;
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}
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static int ocfs2_debug_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
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i_size_read(file->f_mapping->host));
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}
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#else
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static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static int ocfs2_debug_release(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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return 0;
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}
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#endif /* CONFIG_DEBUG_FS */
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static struct file_operations ocfs2_osb_debug_fops = {
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.open = ocfs2_osb_debug_open,
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.release = ocfs2_debug_release,
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.read = ocfs2_debug_read,
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.llseek = generic_file_llseek,
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};
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/*
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* write_super and sync_fs ripped right out of ext3.
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*/
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@ -926,6 +1090,16 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
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goto read_super_error;
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}
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osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
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osb->osb_debug_root,
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osb,
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&ocfs2_osb_debug_fops);
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if (!osb->osb_ctxt) {
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status = -EINVAL;
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mlog_errno(status);
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goto read_super_error;
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}
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status = ocfs2_mount_volume(sb);
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if (osb->root_inode)
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inode = igrab(osb->root_inode);
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@ -1620,6 +1794,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
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osb = OCFS2_SB(sb);
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BUG_ON(!osb);
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debugfs_remove(osb->osb_ctxt);
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ocfs2_disable_quotas(osb);
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ocfs2_shutdown_local_alloc(osb);
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