[PATCH 22/39] jfs: simplify procfs code

Christoph Hellwig
2018-04-19T12:41:23Z

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>
---
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
--
2.17.0