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Date: Thu, 1 Aug 2019 09:41:22 +0800
From: Joseph Qi <joseph.qi@...ux.alibaba.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Mark Fasheh <mark@...heh.com>,
Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Jia Guo <guojia12@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ocfs: further debugfs cleanups
On 19/7/31 21:21, Greg Kroah-Hartman wrote:
> There is no need to check return value of debugfs_create functions, but
> the last sweep through ocfs missed a number of places where this was
> happening. There is also no need to save the individual dentries for
> the debugfs files, as everything is can just be removed at once when the
> directory is removed.
>
> By getting rid of the file dentries for the debugfs entries, a bit of
> local memory can be saved as well.
>
> Cc: Mark Fasheh <mark@...heh.com>
> Cc: Joel Becker <jlbec@...lplan.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Jia Guo <guojia12@...wei.com>
> Cc: ocfs2-devel@....oracle.com
> Cc: Joseph Qi <joseph.qi@...ux.alibaba.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Looks good to me.
Reviewed-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
> ---
> fs/ocfs2/blockcheck.c | 26 ++++-----
> fs/ocfs2/cluster/heartbeat.c | 103 +++++++++--------------------------
> fs/ocfs2/dlm/dlmcommon.h | 1 -
> fs/ocfs2/dlm/dlmdebug.c | 55 ++++---------------
> fs/ocfs2/dlm/dlmdebug.h | 16 +-----
> fs/ocfs2/dlm/dlmdomain.c | 6 +-
> fs/ocfs2/dlmglue.c | 20 ++-----
> fs/ocfs2/ocfs2.h | 3 -
> fs/ocfs2/super.c | 10 +---
> 9 files changed, 60 insertions(+), 180 deletions(-)
>
> diff --git a/fs/ocfs2/blockcheck.c b/fs/ocfs2/blockcheck.c
> index 429e6a8359a5..eaf042feaf5e 100644
> --- a/fs/ocfs2/blockcheck.c
> +++ b/fs/ocfs2/blockcheck.c
> @@ -231,14 +231,6 @@ static int blockcheck_u64_get(void *data, u64 *val)
> }
> DEFINE_SIMPLE_ATTRIBUTE(blockcheck_fops, blockcheck_u64_get, NULL, "%llu\n");
>
> -static struct dentry *blockcheck_debugfs_create(const char *name,
> - struct dentry *parent,
> - u64 *value)
> -{
> - return debugfs_create_file(name, S_IFREG | S_IRUSR, parent, value,
> - &blockcheck_fops);
> -}
> -
> static void ocfs2_blockcheck_debug_remove(struct ocfs2_blockcheck_stats *stats)
> {
> if (stats) {
> @@ -250,16 +242,20 @@ static void ocfs2_blockcheck_debug_remove(struct ocfs2_blockcheck_stats *stats)
> static void ocfs2_blockcheck_debug_install(struct ocfs2_blockcheck_stats *stats,
> struct dentry *parent)
> {
> - stats->b_debug_dir = debugfs_create_dir("blockcheck", parent);
> + struct dentry *dir;
> +
> + dir = debugfs_create_dir("blockcheck", parent);
> + stats->b_debug_dir = dir;
> +
> + debugfs_create_file("blocks_checked", S_IFREG | S_IRUSR, dir,
> + &stats->b_check_count, &blockcheck_fops);
>
> - blockcheck_debugfs_create("blocks_checked", stats->b_debug_dir,
> - &stats->b_check_count);
> + debugfs_create_file("checksums_failed", S_IFREG | S_IRUSR, dir,
> + &stats->b_failure_count, &blockcheck_fops);
>
> - blockcheck_debugfs_create("checksums_failed", stats->b_debug_dir,
> - &stats->b_failure_count);
> + debugfs_create_file("ecc_recoveries", S_IFREG | S_IRUSR, dir,
> + &stats->b_recover_count, &blockcheck_fops);
>
> - blockcheck_debugfs_create("ecc_recoveries", stats->b_debug_dir,
> - &stats->b_recover_count);
> }
> #else
> static inline void ocfs2_blockcheck_debug_install(struct ocfs2_blockcheck_stats *stats,
> diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
> index f1b613327ac8..a368350d4c27 100644
> --- a/fs/ocfs2/cluster/heartbeat.c
> +++ b/fs/ocfs2/cluster/heartbeat.c
> @@ -225,10 +225,6 @@ struct o2hb_region {
> unsigned int hr_region_num;
>
> struct dentry *hr_debug_dir;
> - struct dentry *hr_debug_livenodes;
> - struct dentry *hr_debug_regnum;
> - struct dentry *hr_debug_elapsed_time;
> - struct dentry *hr_debug_pinned;
> struct o2hb_debug_buf *hr_db_livenodes;
> struct o2hb_debug_buf *hr_db_regnum;
> struct o2hb_debug_buf *hr_db_elapsed_time;
> @@ -1394,21 +1390,20 @@ void o2hb_exit(void)
> kfree(o2hb_db_failedregions);
> }
>
> -static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir,
> - struct o2hb_debug_buf **db, int db_len,
> - int type, int size, int len, void *data)
> +static void o2hb_debug_create(const char *name, struct dentry *dir,
> + struct o2hb_debug_buf **db, int db_len, int type,
> + int size, int len, void *data)
> {
> *db = kmalloc(db_len, GFP_KERNEL);
> if (!*db)
> - return NULL;
> + return;
>
> (*db)->db_type = type;
> (*db)->db_size = size;
> (*db)->db_len = len;
> (*db)->db_data = data;
>
> - return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db,
> - &o2hb_debug_fops);
> + debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, &o2hb_debug_fops);
> }
>
> static void o2hb_debug_init(void)
> @@ -1525,11 +1520,7 @@ static void o2hb_region_release(struct config_item *item)
>
> kfree(reg->hr_slots);
>
> - debugfs_remove(reg->hr_debug_livenodes);
> - debugfs_remove(reg->hr_debug_regnum);
> - debugfs_remove(reg->hr_debug_elapsed_time);
> - debugfs_remove(reg->hr_debug_pinned);
> - debugfs_remove(reg->hr_debug_dir);
> + debugfs_remove_recursive(reg->hr_debug_dir);
> kfree(reg->hr_db_livenodes);
> kfree(reg->hr_db_regnum);
> kfree(reg->hr_db_elapsed_time);
> @@ -1988,69 +1979,33 @@ static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group
> : NULL;
> }
>
> -static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
> +static void o2hb_debug_region_init(struct o2hb_region *reg,
> + struct dentry *parent)
> {
> - int ret = -ENOMEM;
> + struct dentry *dir;
>
> - reg->hr_debug_dir =
> - debugfs_create_dir(config_item_name(®->hr_item), dir);
> - if (!reg->hr_debug_dir) {
> - mlog_errno(ret);
> - goto bail;
> - }
> + dir = debugfs_create_dir(config_item_name(®->hr_item), parent);
> + reg->hr_debug_dir = dir;
>
> - reg->hr_debug_livenodes =
> - o2hb_debug_create(O2HB_DEBUG_LIVENODES,
> - reg->hr_debug_dir,
> - &(reg->hr_db_livenodes),
> - sizeof(*(reg->hr_db_livenodes)),
> - O2HB_DB_TYPE_REGION_LIVENODES,
> - sizeof(reg->hr_live_node_bitmap),
> - O2NM_MAX_NODES, reg);
> - if (!reg->hr_debug_livenodes) {
> - mlog_errno(ret);
> - goto bail;
> - }
> + o2hb_debug_create(O2HB_DEBUG_LIVENODES, dir, &(reg->hr_db_livenodes),
> + sizeof(*(reg->hr_db_livenodes)),
> + O2HB_DB_TYPE_REGION_LIVENODES,
> + sizeof(reg->hr_live_node_bitmap), O2NM_MAX_NODES,
> + reg);
>
> - reg->hr_debug_regnum =
> - o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER,
> - reg->hr_debug_dir,
> - &(reg->hr_db_regnum),
> - sizeof(*(reg->hr_db_regnum)),
> - O2HB_DB_TYPE_REGION_NUMBER,
> - 0, O2NM_MAX_NODES, reg);
> - if (!reg->hr_debug_regnum) {
> - mlog_errno(ret);
> - goto bail;
> - }
> + o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, dir, &(reg->hr_db_regnum),
> + sizeof(*(reg->hr_db_regnum)),
> + O2HB_DB_TYPE_REGION_NUMBER, 0, O2NM_MAX_NODES, reg);
>
> - reg->hr_debug_elapsed_time =
> - o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME,
> - reg->hr_debug_dir,
> - &(reg->hr_db_elapsed_time),
> - sizeof(*(reg->hr_db_elapsed_time)),
> - O2HB_DB_TYPE_REGION_ELAPSED_TIME,
> - 0, 0, reg);
> - if (!reg->hr_debug_elapsed_time) {
> - mlog_errno(ret);
> - goto bail;
> - }
> + o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, dir,
> + &(reg->hr_db_elapsed_time),
> + sizeof(*(reg->hr_db_elapsed_time)),
> + O2HB_DB_TYPE_REGION_ELAPSED_TIME, 0, 0, reg);
>
> - reg->hr_debug_pinned =
> - o2hb_debug_create(O2HB_DEBUG_REGION_PINNED,
> - reg->hr_debug_dir,
> - &(reg->hr_db_pinned),
> - sizeof(*(reg->hr_db_pinned)),
> - O2HB_DB_TYPE_REGION_PINNED,
> - 0, 0, reg);
> - if (!reg->hr_debug_pinned) {
> - mlog_errno(ret);
> - goto bail;
> - }
> + o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, dir, &(reg->hr_db_pinned),
> + sizeof(*(reg->hr_db_pinned)),
> + O2HB_DB_TYPE_REGION_PINNED, 0, 0, reg);
>
> - ret = 0;
> -bail:
> - return ret;
> }
>
> static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
> @@ -2106,11 +2061,7 @@ static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *g
> if (ret)
> goto unregister_handler;
>
> - ret = o2hb_debug_region_init(reg, o2hb_debug_dir);
> - if (ret) {
> - config_item_put(®->hr_item);
> - goto unregister_handler;
> - }
> + o2hb_debug_region_init(reg, o2hb_debug_dir);
>
> return ®->hr_item;
>
> diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
> index 69a429b625cc..aaf24548b02a 100644
> --- a/fs/ocfs2/dlm/dlmcommon.h
> +++ b/fs/ocfs2/dlm/dlmcommon.h
> @@ -142,7 +142,6 @@ struct dlm_ctxt
> atomic_t res_tot_count;
> atomic_t res_cur_count;
>
> - struct dlm_debug_ctxt *dlm_debug_ctxt;
> struct dentry *dlm_debugfs_subroot;
>
> /* NOTE: Next three are protected by dlm_domain_lock */
> diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
> index a4b58ba99927..4d0b452012b2 100644
> --- a/fs/ocfs2/dlm/dlmdebug.c
> +++ b/fs/ocfs2/dlm/dlmdebug.c
> @@ -853,67 +853,34 @@ static const struct file_operations debug_state_fops = {
> /* files in subroot */
> void dlm_debug_init(struct dlm_ctxt *dlm)
> {
> - struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
> -
> /* for dumping dlm_ctxt */
> - dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
> - S_IFREG|S_IRUSR,
> - dlm->dlm_debugfs_subroot,
> - dlm, &debug_state_fops);
> + debugfs_create_file(DLM_DEBUGFS_DLM_STATE, S_IFREG|S_IRUSR,
> + dlm->dlm_debugfs_subroot, dlm, &debug_state_fops);
>
> /* for dumping lockres */
> - dc->debug_lockres_dentry =
> - debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
> - S_IFREG|S_IRUSR,
> - dlm->dlm_debugfs_subroot,
> - dlm, &debug_lockres_fops);
> + debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, S_IFREG|S_IRUSR,
> + dlm->dlm_debugfs_subroot, dlm, &debug_lockres_fops);
>
> /* for dumping mles */
> - dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
> - S_IFREG|S_IRUSR,
> - dlm->dlm_debugfs_subroot,
> - dlm, &debug_mle_fops);
> + debugfs_create_file(DLM_DEBUGFS_MLE_STATE, S_IFREG|S_IRUSR,
> + dlm->dlm_debugfs_subroot, dlm, &debug_mle_fops);
>
> /* for dumping lockres on the purge list */
> - dc->debug_purgelist_dentry =
> - debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
> - S_IFREG|S_IRUSR,
> - dlm->dlm_debugfs_subroot,
> - dlm, &debug_purgelist_fops);
> -}
> -
> -void dlm_debug_shutdown(struct dlm_ctxt *dlm)
> -{
> - struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
> -
> - if (dc) {
> - debugfs_remove(dc->debug_purgelist_dentry);
> - debugfs_remove(dc->debug_mle_dentry);
> - debugfs_remove(dc->debug_lockres_dentry);
> - debugfs_remove(dc->debug_state_dentry);
> - kfree(dc);
> - dc = NULL;
> - }
> + debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, S_IFREG|S_IRUSR,
> + dlm->dlm_debugfs_subroot, dlm,
> + &debug_purgelist_fops);
> }
>
> /* subroot - domain dir */
> -int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
> +void dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
> {
> - dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
> - GFP_KERNEL);
> - if (!dlm->dlm_debug_ctxt) {
> - mlog_errno(-ENOMEM);
> - return -ENOMEM;
> - }
> -
> dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
> dlm_debugfs_root);
> - return 0;
> }
>
> void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
> {
> - debugfs_remove(dlm->dlm_debugfs_subroot);
> + debugfs_remove_recursive(dlm->dlm_debugfs_subroot);
> }
>
> /* debugfs root */
> diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h
> index 7d0c7c9013ce..f8fd8680a4b6 100644
> --- a/fs/ocfs2/dlm/dlmdebug.h
> +++ b/fs/ocfs2/dlm/dlmdebug.h
> @@ -14,13 +14,6 @@ void dlm_print_one_mle(struct dlm_master_list_entry *mle);
>
> #ifdef CONFIG_DEBUG_FS
>
> -struct dlm_debug_ctxt {
> - struct dentry *debug_state_dentry;
> - struct dentry *debug_lockres_dentry;
> - struct dentry *debug_mle_dentry;
> - struct dentry *debug_purgelist_dentry;
> -};
> -
> struct debug_lockres {
> int dl_len;
> char *dl_buf;
> @@ -29,9 +22,8 @@ struct debug_lockres {
> };
>
> void dlm_debug_init(struct dlm_ctxt *dlm);
> -void dlm_debug_shutdown(struct dlm_ctxt *dlm);
>
> -int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm);
> +void dlm_create_debugfs_subroot(struct dlm_ctxt *dlm);
> void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm);
>
> void dlm_create_debugfs_root(void);
> @@ -42,12 +34,8 @@ void dlm_destroy_debugfs_root(void);
> static inline void dlm_debug_init(struct dlm_ctxt *dlm)
> {
> }
> -static inline void dlm_debug_shutdown(struct dlm_ctxt *dlm)
> -{
> -}
> -static inline int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
> +static inline void dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
> {
> - return 0;
> }
> static inline void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
> {
> diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
> index 7338b5d4647c..5c4218d66dd2 100644
> --- a/fs/ocfs2/dlm/dlmdomain.c
> +++ b/fs/ocfs2/dlm/dlmdomain.c
> @@ -387,7 +387,6 @@ static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
> static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
> {
> dlm_unregister_domain_handlers(dlm);
> - dlm_debug_shutdown(dlm);
> dlm_complete_thread(dlm);
> dlm_complete_recovery_thread(dlm);
> dlm_destroy_dlm_worker(dlm);
> @@ -1938,7 +1937,6 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
>
> if (status) {
> dlm_unregister_domain_handlers(dlm);
> - dlm_debug_shutdown(dlm);
> dlm_complete_thread(dlm);
> dlm_complete_recovery_thread(dlm);
> dlm_destroy_dlm_worker(dlm);
> @@ -1992,9 +1990,7 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
> dlm->key = key;
> dlm->node_num = o2nm_this_node();
>
> - ret = dlm_create_debugfs_subroot(dlm);
> - if (ret < 0)
> - goto leave;
> + dlm_create_debugfs_subroot(dlm);
>
> spin_lock_init(&dlm->spinlock);
> spin_lock_init(&dlm->master_lock);
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index 14207234fa3d..ad594fef2ab0 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -3012,8 +3012,6 @@ struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
>
> kref_init(&dlm_debug->d_refcnt);
> INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
> - dlm_debug->d_locking_state = NULL;
> - dlm_debug->d_locking_filter = NULL;
> dlm_debug->d_filter_secs = 0;
> out:
> return dlm_debug;
> @@ -3282,27 +3280,19 @@ static void ocfs2_dlm_init_debug(struct ocfs2_super *osb)
> {
> struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
>
> - dlm_debug->d_locking_state = debugfs_create_file("locking_state",
> - S_IFREG|S_IRUSR,
> - osb->osb_debug_root,
> - osb,
> - &ocfs2_dlm_debug_fops);
> + debugfs_create_file("locking_state", S_IFREG|S_IRUSR,
> + osb->osb_debug_root, osb, &ocfs2_dlm_debug_fops);
>
> - dlm_debug->d_locking_filter = debugfs_create_u32("locking_filter",
> - 0600,
> - osb->osb_debug_root,
> - &dlm_debug->d_filter_secs);
> + debugfs_create_u32("locking_filter", 0600, osb->osb_debug_root,
> + &dlm_debug->d_filter_secs);
> }
>
> static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
> {
> struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
>
> - if (dlm_debug) {
> - debugfs_remove(dlm_debug->d_locking_state);
> - debugfs_remove(dlm_debug->d_locking_filter);
> + if (dlm_debug)
> ocfs2_put_dlm_debug(dlm_debug);
> - }
> }
>
> int ocfs2_dlm_init(struct ocfs2_super *osb)
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index fddbbd60f434..9150cfa4df7d 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -223,8 +223,6 @@ struct ocfs2_orphan_scan {
>
> struct ocfs2_dlm_debug {
> struct kref d_refcnt;
> - struct dentry *d_locking_state;
> - struct dentry *d_locking_filter;
> u32 d_filter_secs;
> struct list_head d_lockres_tracking;
> };
> @@ -401,7 +399,6 @@ 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 8b2f39506648..c81e86c62380 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -1080,10 +1080,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
> osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
> ocfs2_debugfs_root);
>
> - osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
> - osb->osb_debug_root,
> - osb,
> - &ocfs2_osb_debug_fops);
> + debugfs_create_file("fs_state", S_IFREG|S_IRUSR, osb->osb_debug_root,
> + osb, &ocfs2_osb_debug_fops);
>
> if (ocfs2_meta_ecc(osb))
> ocfs2_blockcheck_stats_debugfs_install( &osb->osb_ecc_stats,
> @@ -1861,8 +1859,6 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
>
> kset_unregister(osb->osb_dev_kset);
>
> - debugfs_remove(osb->osb_ctxt);
> -
> /* Orphan scan should be stopped as early as possible */
> ocfs2_orphan_scan_stop(osb);
>
> @@ -1918,7 +1914,7 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
> ocfs2_dlm_shutdown(osb, hangup_needed);
>
> ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
> - debugfs_remove(osb->osb_debug_root);
> + debugfs_remove_recursive(osb->osb_debug_root);
>
> if (hangup_needed)
> ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
>
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