[PATCH 0/5] nfsd: use DEFINE_PROC_SHOW_ATTRIBUTE/DEFINE_SHOW_ATTRIBUTE to simplify the code

[PATCH 0/5] nfsd: use DEFINE_PROC_SHOW_ATTRIBUTE/DEFINE_SHOW_ATTRIBUTE to simplify the code

[ChenXiaoSong]

Use DEFINE_PROC_SHOW_ATTRIBUTE/DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.

No functional change.

ChenXiaoSong (5):
  nfsd: use DEFINE_PROC_SHOW_ATTRIBUTE to define nfsd_proc_ops
  nfsd: use DEFINE_SHOW_ATTRIBUTE to define export_features_fops and
    supported_enctypes_fops
  nfsd: use DEFINE_SHOW_ATTRIBUTE to define client_info_fops
  nfsd: use DEFINE_SHOW_ATTRIBUTE to define nfsd_reply_cache_stats_fops
  nfsd: use DEFINE_SHOW_ATTRIBUTE to define nfsd_file_cache_stats_fops

 fs/nfsd/cache.h     |  2 +-
 fs/nfsd/filecache.c |  7 +------
 fs/nfsd/filecache.h |  2 +-
 fs/nfsd/nfs4state.c | 14 ++------------
 fs/nfsd/nfscache.c  | 13 +++----------
 fs/nfsd/nfsctl.c    | 46 ++++++++-------------------------------------
 fs/nfsd/stats.c     | 14 ++------------
 7 files changed, 18 insertions(+), 80 deletions(-)

-- 
2.31.1

[PATCH 1/5] nfsd: use DEFINE_PROC_SHOW_ATTRIBUTE to define nfsd_proc_ops

[ChenXiaoSong]

Use DEFINE_PROC_SHOW_ATTRIBUTE helper macro to simplify the code.

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
 fs/nfsd/stats.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
index a8c5a02a84f0..777e24e5da33 100644
--- a/fs/nfsd/stats.c
+++ b/fs/nfsd/stats.c
@@ -32,7 +32,7 @@ struct svc_stat		nfsd_svcstats = {
 	.program	= &nfsd_program,
 };
 
-static int nfsd_proc_show(struct seq_file *seq, void *v)
+static int nfsd_show(struct seq_file *seq, void *v)
 {
 	int i;
 
@@ -72,17 +72,7 @@ static int nfsd_proc_show(struct seq_file *seq, void *v)
 	return 0;
 }
 
-static int nfsd_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, nfsd_proc_show, NULL);
-}
-
-static const struct proc_ops nfsd_proc_ops = {
-	.proc_open	= nfsd_proc_open,
-	.proc_read	= seq_read,
-	.proc_lseek	= seq_lseek,
-	.proc_release	= single_release,
-};
+DEFINE_PROC_SHOW_ATTRIBUTE(nfsd);
 
 int nfsd_percpu_counters_init(struct percpu_counter counters[], int num)
 {
-- 
2.31.1

[PATCH 2/5] nfsd: use DEFINE_SHOW_ATTRIBUTE to define export_features_fops and supported_enctypes_fops

[ChenXiaoSong]

Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
 fs/nfsd/nfsctl.c | 28 ++++------------------------
 1 file changed, 4 insertions(+), 24 deletions(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 917fa1892fd2..51360d0bf424 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -185,17 +185,7 @@ static int export_features_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static int export_features_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, export_features_show, NULL);
-}
-
-static const struct file_operations export_features_operations = {
-	.open		= export_features_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(export_features);
 
 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 static int supported_enctypes_show(struct seq_file *m, void *v)
@@ -204,17 +194,7 @@ static int supported_enctypes_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static int supported_enctypes_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, supported_enctypes_show, NULL);
-}
-
-static const struct file_operations supported_enctypes_ops = {
-	.open		= supported_enctypes_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(supported_enctypes);
 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 
 static const struct file_operations pool_stats_operations = {
@@ -1365,7 +1345,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 		/* Per-export io stats use same ops as exports file */
 		[NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
 		[NFSD_Export_features] = {"export_features",
-					&export_features_operations, S_IRUGO},
+					&export_features_fops, S_IRUGO},
 		[NFSD_FO_UnlockIP] = {"unlock_ip",
 					&transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_FO_UnlockFS] = {"unlock_filesystem",
@@ -1381,7 +1361,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 		[NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
 		[NFSD_Filecache] = {"filecache", &filecache_ops, S_IRUGO},
 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
-		[NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
+		[NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_fops, S_IRUGO},
 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 #ifdef CONFIG_NFSD_V4
 		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
-- 
2.31.1

[PATCH 3/5] nfsd: use DEFINE_SHOW_ATTRIBUTE to define client_info_fops

[ChenXiaoSong]

Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.

inode is converted from seq_file->file instead of seq_file->private in
client_info_show().

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
 fs/nfsd/nfs4state.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index c5d199d7e6b4..4017721a04c7 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2478,7 +2478,7 @@ static const char *cb_state2str(int state)
 
 static int client_info_show(struct seq_file *m, void *v)
 {
-	struct inode *inode = m->private;
+	struct inode *inode = file_inode(m->file);
 	struct nfs4_client *clp;
 	u64 clid;
 
@@ -2518,17 +2518,7 @@ static int client_info_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static int client_info_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, client_info_show, inode);
-}
-
-static const struct file_operations client_info_fops = {
-	.open		= client_info_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(client_info);
 
 static void *states_start(struct seq_file *s, loff_t *pos)
 	__acquires(&clp->cl_lock)
-- 
2.31.1

[PATCH 4/5] nfsd: use DEFINE_SHOW_ATTRIBUTE to define nfsd_reply_cache_stats_fops

[ChenXiaoSong]

Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.

nfsd_net is converted from seq_file->file instead of seq_file->private in
nfsd_reply_cache_stats_show().

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
 fs/nfsd/cache.h    |  2 +-
 fs/nfsd/nfscache.c | 13 +++----------
 fs/nfsd/nfsctl.c   |  9 ++-------
 3 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/fs/nfsd/cache.h b/fs/nfsd/cache.h
index 65c331f75e9c..f21259ead64b 100644
--- a/fs/nfsd/cache.h
+++ b/fs/nfsd/cache.h
@@ -84,6 +84,6 @@ int	nfsd_reply_cache_init(struct nfsd_net *);
 void	nfsd_reply_cache_shutdown(struct nfsd_net *);
 int	nfsd_cache_lookup(struct svc_rqst *);
 void	nfsd_cache_update(struct svc_rqst *, int, __be32 *);
-int	nfsd_reply_cache_stats_open(struct inode *, struct file *);
+int	nfsd_reply_cache_stats_show(struct seq_file *m, void *v);
 
 #endif /* NFSCACHE_H */
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 9b31e1103e7b..3e64a3d50a1c 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -604,9 +604,10 @@ nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *data)
  * scraping this file for info should test the labels to ensure they're
  * getting the correct field.
  */
-static int nfsd_reply_cache_stats_show(struct seq_file *m, void *v)
+int nfsd_reply_cache_stats_show(struct seq_file *m, void *v)
 {
-	struct nfsd_net *nn = m->private;
+	struct nfsd_net *nn = net_generic(file_inode(m->file)->i_sb->s_fs_info,
+					  nfsd_net_id);
 
 	seq_printf(m, "max entries:           %u\n", nn->max_drc_entries);
 	seq_printf(m, "num entries:           %u\n",
@@ -626,11 +627,3 @@ static int nfsd_reply_cache_stats_show(struct seq_file *m, void *v)
 	seq_printf(m, "cachesize at longest:  %u\n", nn->longest_chain_cachesize);
 	return 0;
 }
-
-int nfsd_reply_cache_stats_open(struct inode *inode, struct file *file)
-{
-	struct nfsd_net *nn = net_generic(file_inode(file)->i_sb->s_fs_info,
-								nfsd_net_id);
-
-	return single_open(file, nfsd_reply_cache_stats_show, nn);
-}
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 51360d0bf424..faaedefec94c 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -204,12 +204,7 @@ static const struct file_operations pool_stats_operations = {
 	.release	= nfsd_pool_stats_release,
 };
 
-static const struct file_operations reply_cache_stats_operations = {
-	.open		= nfsd_reply_cache_stats_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
 
 static const struct file_operations filecache_ops = {
 	.open		= nfsd_file_cache_stats_open,
@@ -1354,7 +1349,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 		[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
-		[NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
+		[NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &nfsd_reply_cache_stats_fops, S_IRUGO},
 		[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 		[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
-- 
2.31.1

[PATCH 5/5] nfsd: use DEFINE_SHOW_ATTRIBUTE to define nfsd_file_cache_stats_fops

[ChenXiaoSong]

Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
 fs/nfsd/filecache.c | 7 +------
 fs/nfsd/filecache.h | 2 +-
 fs/nfsd/nfsctl.c    | 9 ++-------
 3 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index eeed4ae5b4ad..d5c57360b418 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -1212,7 +1212,7 @@ nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
  * scraping this file for info should test the labels to ensure they're
  * getting the correct field.
  */
-static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
+int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 {
 	unsigned long releases = 0, pages_flushed = 0, evictions = 0;
 	unsigned long hits = 0, acquisitions = 0;
@@ -1259,8 +1259,3 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 	seq_printf(m, "pages flushed: %lu\n", pages_flushed);
 	return 0;
 }
-
-int nfsd_file_cache_stats_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, nfsd_file_cache_stats_show, NULL);
-}
diff --git a/fs/nfsd/filecache.h b/fs/nfsd/filecache.h
index 8e8c0c47d67d..357832bac736 100644
--- a/fs/nfsd/filecache.h
+++ b/fs/nfsd/filecache.h
@@ -60,5 +60,5 @@ __be32 nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		  unsigned int may_flags, struct nfsd_file **nfp);
 __be32 nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		  unsigned int may_flags, struct nfsd_file **nfp);
-int	nfsd_file_cache_stats_open(struct inode *, struct file *);
+int nfsd_file_cache_stats_show(struct seq_file *m, void *v);
 #endif /* _FS_NFSD_FILECACHE_H */
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index faaedefec94c..e6be0e2a86ac 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -206,12 +206,7 @@ static const struct file_operations pool_stats_operations = {
 
 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
 
-static const struct file_operations filecache_ops = {
-	.open		= nfsd_file_cache_stats_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
 
 /*----------------------------------------------------------------------------*/
 /*
@@ -1354,7 +1349,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 		[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 		[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
 		[NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
-		[NFSD_Filecache] = {"filecache", &filecache_ops, S_IRUGO},
+		[NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 		[NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_fops, S_IRUGO},
 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
-- 
2.31.1

Re: [PATCH 3/5] nfsd: use DEFINE_SHOW_ATTRIBUTE to define client_info_fops

[Chuck Lever III]

> On Sep 22, 2022, at 12:31 PM, ChenXiaoSong <chenxiaosong2@huawei.com> wrote:
> 
> Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.
> 
> inode is converted from seq_file->file instead of seq_file->private in
> client_info_show().

Generally speaking, the patch description should explain why
a change is being made. We can already see that @inode is
converted by looking at the diff below, so the above comment
doesn't add value. Same remark applies to 4/5.

What might work better: "The underlying inode needed by
client_info_show() is already available via struct seq_file.
Thus it is safe to replace client_info_open() with the open
function implicitly defined by DEFINE_SHOW_ATTRIBUTE()."

I'll apply these as-is to nfsd for-next to get them into the
testing pipeline. Thanks!


> Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
> ---
> fs/nfsd/nfs4state.c | 14 ++------------
> 1 file changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index c5d199d7e6b4..4017721a04c7 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -2478,7 +2478,7 @@ static const char *cb_state2str(int state)
> 
> static int client_info_show(struct seq_file *m, void *v)
> {
> -	struct inode *inode = m->private;
> +	struct inode *inode = file_inode(m->file);
> 	struct nfs4_client *clp;
> 	u64 clid;
> 
> @@ -2518,17 +2518,7 @@ static int client_info_show(struct seq_file *m, void *v)
> 	return 0;
> }
> 
> -static int client_info_open(struct inode *inode, struct file *file)
> -{
> -	return single_open(file, client_info_show, inode);
> -}
> -
> -static const struct file_operations client_info_fops = {
> -	.open		= client_info_open,
> -	.read		= seq_read,
> -	.llseek		= seq_lseek,
> -	.release	= single_release,
> -};
> +DEFINE_SHOW_ATTRIBUTE(client_info);
> 
> static void *states_start(struct seq_file *s, loff_t *pos)
> 	__acquires(&clp->cl_lock)
> -- 
> 2.31.1
> 

--
Chuck Lever