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SubjectRe: [Jfs-discussion] [PATCH 25/42] jfs: simplify procfs code
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On 05/16/2018 04:43 AM, Christoph Hellwig wrote:
> Use remove_proc_subtree to remove the whole subtree on cleanup, and
> unwind the registration loop into individual calls. Switch to use
> proc_create_seq where applicable.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>

> ---
> fs/jfs/jfs_debug.c | 43 ++++++++++++++-----------------------------
> fs/jfs/jfs_debug.h | 10 +++++-----
> fs/jfs/jfs_logmgr.c | 14 +-------------
> fs/jfs/jfs_metapage.c | 14 +-------------
> fs/jfs/jfs_txnmgr.c | 28 ++--------------------------
> fs/jfs/jfs_xtree.c | 14 +-------------
> 6 files changed, 24 insertions(+), 99 deletions(-)
>
> diff --git a/fs/jfs/jfs_debug.c b/fs/jfs/jfs_debug.c
> index a70907606025..35a5b2a81ae0 100644
> --- a/fs/jfs/jfs_debug.c
> +++ b/fs/jfs/jfs_debug.c
> @@ -29,7 +29,6 @@
>
> #ifdef PROC_FS_JFS /* see jfs_debug.h */
>
> -static struct proc_dir_entry *base;
> #ifdef CONFIG_JFS_DEBUG
> static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
> {
> @@ -66,43 +65,29 @@ static const struct file_operations jfs_loglevel_proc_fops = {
> };
> #endif
>
> -static struct {
> - const char *name;
> - const struct file_operations *proc_fops;
> -} Entries[] = {
> -#ifdef CONFIG_JFS_STATISTICS
> - { "lmstats", &jfs_lmstats_proc_fops, },
> - { "txstats", &jfs_txstats_proc_fops, },
> - { "xtstat", &jfs_xtstat_proc_fops, },
> - { "mpstat", &jfs_mpstat_proc_fops, },
> -#endif
> -#ifdef CONFIG_JFS_DEBUG
> - { "TxAnchor", &jfs_txanchor_proc_fops, },
> - { "loglevel", &jfs_loglevel_proc_fops }
> -#endif
> -};
> -#define NPROCENT ARRAY_SIZE(Entries)
> -
> void jfs_proc_init(void)
> {
> - int i;
> + struct proc_dir_entry *base;
>
> - if (!(base = proc_mkdir("fs/jfs", NULL)))
> + base = proc_mkdir("fs/jfs", NULL);
> + if (!base)
> return;
>
> - for (i = 0; i < NPROCENT; i++)
> - proc_create(Entries[i].name, 0, base, Entries[i].proc_fops);
> +#ifdef CONFIG_JFS_STATISTICS
> + proc_create_single("lmstats", 0, base, jfs_lmstats_proc_show);
> + proc_create_single("txstats", 0, base, jfs_txstats_proc_show);
> + proc_create_single("xtstat", 0, base, jfs_xtstat_proc_show);
> + proc_create_single("mpstat", 0, base, jfs_mpstat_proc_show);
> +#endif
> +#ifdef CONFIG_JFS_DEBUG
> + proc_create_single("TxAnchor", 0, base, jfs_txanchor_proc_show);
> + proc_create("loglevel", 0, base, &jfs_loglevel_proc_fops);
> +#endif
> }
>
> void jfs_proc_clean(void)
> {
> - int i;
> -
> - if (base) {
> - for (i = 0; i < NPROCENT; i++)
> - remove_proc_entry(Entries[i].name, base);
> - remove_proc_entry("fs/jfs", NULL);
> - }
> + remove_proc_subtree("fs/jfs", NULL);
> }
>
> #endif /* PROC_FS_JFS */
> diff --git a/fs/jfs/jfs_debug.h b/fs/jfs/jfs_debug.h
> index eafd1300a00b..0d9e35da8462 100644
> --- a/fs/jfs/jfs_debug.h
> +++ b/fs/jfs/jfs_debug.h
> @@ -62,7 +62,7 @@ extern void jfs_proc_clean(void);
>
> extern int jfsloglevel;
>
> -extern const struct file_operations jfs_txanchor_proc_fops;
> +int jfs_txanchor_proc_show(struct seq_file *m, void *v);
>
> /* information message: e.g., configuration, major event */
> #define jfs_info(fmt, arg...) do { \
> @@ -105,10 +105,10 @@ extern const struct file_operations jfs_txanchor_proc_fops;
> * ----------
> */
> #ifdef CONFIG_JFS_STATISTICS
> -extern const struct file_operations jfs_lmstats_proc_fops;
> -extern const struct file_operations jfs_txstats_proc_fops;
> -extern const struct file_operations jfs_mpstat_proc_fops;
> -extern const struct file_operations jfs_xtstat_proc_fops;
> +int jfs_lmstats_proc_show(struct seq_file *m, void *v);
> +int jfs_txstats_proc_show(struct seq_file *m, void *v);
> +int jfs_mpstat_proc_show(struct seq_file *m, void *v);
> +int jfs_xtstat_proc_show(struct seq_file *m, void *v);
>
> #define INCREMENT(x) ((x)++)
> #define DECREMENT(x) ((x)--)
> diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
> index 0e5d412c0b01..6b68df395892 100644
> --- a/fs/jfs/jfs_logmgr.c
> +++ b/fs/jfs/jfs_logmgr.c
> @@ -2493,7 +2493,7 @@ int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
> }
>
> #ifdef CONFIG_JFS_STATISTICS
> -static int jfs_lmstats_proc_show(struct seq_file *m, void *v)
> +int jfs_lmstats_proc_show(struct seq_file *m, void *v)
> {
> seq_printf(m,
> "JFS Logmgr stats\n"
> @@ -2510,16 +2510,4 @@ static int jfs_lmstats_proc_show(struct seq_file *m, void *v)
> lmStat.partial_page);
> return 0;
> }
> -
> -static int jfs_lmstats_proc_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, jfs_lmstats_proc_show, NULL);
> -}
> -
> -const struct file_operations jfs_lmstats_proc_fops = {
> - .open = jfs_lmstats_proc_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> #endif /* CONFIG_JFS_STATISTICS */
> diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
> index 1a3b0cc22ad3..fa2c6824c7f2 100644
> --- a/fs/jfs/jfs_metapage.c
> +++ b/fs/jfs/jfs_metapage.c
> @@ -815,7 +815,7 @@ void __invalidate_metapages(struct inode *ip, s64 addr, int len)
> }
>
> #ifdef CONFIG_JFS_STATISTICS
> -static int jfs_mpstat_proc_show(struct seq_file *m, void *v)
> +int jfs_mpstat_proc_show(struct seq_file *m, void *v)
> {
> seq_printf(m,
> "JFS Metapage statistics\n"
> @@ -828,16 +828,4 @@ static int jfs_mpstat_proc_show(struct seq_file *m, void *v)
> mpStat.lockwait);
> return 0;
> }
> -
> -static int jfs_mpstat_proc_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, jfs_mpstat_proc_show, NULL);
> -}
> -
> -const struct file_operations jfs_mpstat_proc_fops = {
> - .open = jfs_mpstat_proc_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> #endif
> diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
> index 4d973524c887..a5663cb621d8 100644
> --- a/fs/jfs/jfs_txnmgr.c
> +++ b/fs/jfs/jfs_txnmgr.c
> @@ -2998,7 +2998,7 @@ int jfs_sync(void *arg)
> }
>
> #if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
> -static int jfs_txanchor_proc_show(struct seq_file *m, void *v)
> +int jfs_txanchor_proc_show(struct seq_file *m, void *v)
> {
> char *freewait;
> char *freelockwait;
> @@ -3032,22 +3032,10 @@ static int jfs_txanchor_proc_show(struct seq_file *m, void *v)
> list_empty(&TxAnchor.unlock_queue) ? "" : "not ");
> return 0;
> }
> -
> -static int jfs_txanchor_proc_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, jfs_txanchor_proc_show, NULL);
> -}
> -
> -const struct file_operations jfs_txanchor_proc_fops = {
> - .open = jfs_txanchor_proc_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> #endif
>
> #if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
> -static int jfs_txstats_proc_show(struct seq_file *m, void *v)
> +int jfs_txstats_proc_show(struct seq_file *m, void *v)
> {
> seq_printf(m,
> "JFS TxStats\n"
> @@ -3072,16 +3060,4 @@ static int jfs_txstats_proc_show(struct seq_file *m, void *v)
> TxStat.txLockAlloc_freelock);
> return 0;
> }
> -
> -static int jfs_txstats_proc_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, jfs_txstats_proc_show, NULL);
> -}
> -
> -const struct file_operations jfs_txstats_proc_fops = {
> - .open = jfs_txstats_proc_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> #endif
> diff --git a/fs/jfs/jfs_xtree.c b/fs/jfs/jfs_xtree.c
> index 5cde6d2fcfca..2c200b5256a6 100644
> --- a/fs/jfs/jfs_xtree.c
> +++ b/fs/jfs/jfs_xtree.c
> @@ -3874,7 +3874,7 @@ s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size)
> }
>
> #ifdef CONFIG_JFS_STATISTICS
> -static int jfs_xtstat_proc_show(struct seq_file *m, void *v)
> +int jfs_xtstat_proc_show(struct seq_file *m, void *v)
> {
> seq_printf(m,
> "JFS Xtree statistics\n"
> @@ -3887,16 +3887,4 @@ static int jfs_xtstat_proc_show(struct seq_file *m, void *v)
> xtStat.split);
> return 0;
> }
> -
> -static int jfs_xtstat_proc_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, jfs_xtstat_proc_show, NULL);
> -}
> -
> -const struct file_operations jfs_xtstat_proc_fops = {
> - .open = jfs_xtstat_proc_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> #endif
>

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