[PATCH v4 04/39] netfs, fscache: Move /proc/fs/fscache to /proc/fs/netfs and put in a symlink

From: David Howells
Date: Wed Dec 13 2023 - 10:24:29 EST

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Rename /proc/fs/fscache to "netfs" and make a symlink from fscache to that.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: Christian Brauner <christian@xxxxxxxxxx>
cc: linux-fsdevel@xxxxxxxxxxxxxxx
cc: linux-cachefs@xxxxxxxxxx
---
fs/netfs/fscache_main.c | 8 ++------
fs/netfs/fscache_proc.c | 23 ++++++++---------------
fs/netfs/fscache_stats.c | 4 +---
fs/netfs/internal.h | 12 +++++++++++-
fs/netfs/main.c | 33 +++++++++++++++++++++++++++++++++
fs/netfs/stats.c | 13 +++++++------
include/linux/netfs.h | 1 -
7 files changed, 62 insertions(+), 32 deletions(-)

diff --git a/fs/netfs/fscache_main.c b/fs/netfs/fscache_main.c
index 00600a4d9ce5..42e98bb523e3 100644
--- a/fs/netfs/fscache_main.c
+++ b/fs/netfs/fscache_main.c
@@ -62,7 +62,7 @@ unsigned int fscache_hash(unsigned int salt, const void *data, size_t len)
/*
* initialise the fs caching module
*/
-static int __init fscache_init(void)
+int __init fscache_init(void)
{
int ret = -ENOMEM;

@@ -94,12 +94,10 @@ static int __init fscache_init(void)
return ret;
}

-fs_initcall(fscache_init);
-
/*
* clean up on module removal
*/
-static void __exit fscache_exit(void)
+void __exit fscache_exit(void)
{
_enter("");

@@ -108,5 +106,3 @@ static void __exit fscache_exit(void)
destroy_workqueue(fscache_wq);
pr_notice("FS-Cache unloaded\n");
}
-
-module_exit(fscache_exit);
diff --git a/fs/netfs/fscache_proc.c b/fs/netfs/fscache_proc.c
index dc3b0e9c8cce..ecd0d1edafaa 100644
--- a/fs/netfs/fscache_proc.c
+++ b/fs/netfs/fscache_proc.c
@@ -12,41 +12,34 @@
#include "internal.h"

/*
- * initialise the /proc/fs/fscache/ directory
+ * Add files to /proc/fs/netfs/.
*/
int __init fscache_proc_init(void)
{
- if (!proc_mkdir("fs/fscache", NULL))
- goto error_dir;
+ if (!proc_symlink("fs/fscache", NULL, "../netfs"))
+ goto error_sym;

- if (!proc_create_seq("fs/fscache/caches", S_IFREG | 0444, NULL,
+ if (!proc_create_seq("fs/netfs/caches", S_IFREG | 0444, NULL,
&fscache_caches_seq_ops))
goto error;

- if (!proc_create_seq("fs/fscache/volumes", S_IFREG | 0444, NULL,
+ if (!proc_create_seq("fs/netfs/volumes", S_IFREG | 0444, NULL,
&fscache_volumes_seq_ops))
goto error;

- if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
+ if (!proc_create_seq("fs/netfs/cookies", S_IFREG | 0444, NULL,
&fscache_cookies_seq_ops))
goto error;
-
-#ifdef CONFIG_FSCACHE_STATS
- if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
- fscache_stats_show))
- goto error;
-#endif
-
return 0;

error:
remove_proc_entry("fs/fscache", NULL);
-error_dir:
+error_sym:
return -ENOMEM;
}

/*
- * clean up the /proc/fs/fscache/ directory
+ * Clean up the /proc/fs/fscache symlink.
*/
void fscache_proc_cleanup(void)
{
diff --git a/fs/netfs/fscache_stats.c b/fs/netfs/fscache_stats.c
index fc94e5e79f1c..aad812ead398 100644
--- a/fs/netfs/fscache_stats.c
+++ b/fs/netfs/fscache_stats.c
@@ -52,7 +52,7 @@ EXPORT_SYMBOL(fscache_n_culled);
/*
* display the general statistics
*/
-int fscache_stats_show(struct seq_file *m, void *v)
+int fscache_stats_show(struct seq_file *m)
{
seq_puts(m, "FS-Cache statistics\n");
seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
@@ -96,7 +96,5 @@ int fscache_stats_show(struct seq_file *m, void *v)
seq_printf(m, "IO : rd=%u wr=%u\n",
atomic_read(&fscache_n_read),
atomic_read(&fscache_n_write));
-
- netfs_stats_show(m);
return 0;
}
diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index 43769ac606e8..a15fe67e1db7 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -76,6 +76,7 @@ extern atomic_t netfs_n_rh_write_done;
extern atomic_t netfs_n_rh_write_failed;
extern atomic_t netfs_n_rh_write_zskip;

+int netfs_stats_show(struct seq_file *m, void *v);

static inline void netfs_stat(atomic_t *stat)
{
@@ -166,6 +167,13 @@ static inline void fscache_see_cookie(struct fscache_cookie *cookie,
* fscache-main.c
*/
extern unsigned int fscache_hash(unsigned int salt, const void *data, size_t len);
+#ifdef CONFIG_PROC_FS
+int __init fscache_init(void);
+void __exit fscache_exit(void);
+#else
+static inline int fscache_init(void) { return 0; }
+static inline void fscache_exit(void) {}
+#endif

/*
* fscache-proc.c
@@ -216,12 +224,14 @@ static inline void fscache_stat_d(atomic_t *stat)

#define __fscache_stat(stat) (stat)

-int fscache_stats_show(struct seq_file *m, void *v);
+int fscache_stats_show(struct seq_file *m);
#else

#define __fscache_stat(stat) (NULL)
#define fscache_stat(stat) do {} while (0)
#define fscache_stat_d(stat) do {} while (0)
+
+static inline int fscache_stats_show(struct seq_file *m) { return 0; }
#endif

/*
diff --git a/fs/netfs/main.c b/fs/netfs/main.c
index 1ba8091fcf3e..c9af6e0896d3 100644
--- a/fs/netfs/main.c
+++ b/fs/netfs/main.c
@@ -7,6 +7,8 @@

#include <linux/module.h>
#include <linux/export.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
#include "internal.h"
#define CREATE_TRACE_POINTS
#include <trace/events/netfs.h>
@@ -19,3 +21,34 @@ unsigned netfs_debug;
module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask");

+static int __init netfs_init(void)
+{
+ int ret = -ENOMEM;
+
+ if (!proc_mkdir("fs/netfs", NULL))
+ goto error;
+
+#ifdef CONFIG_FSCACHE_STATS
+ if (!proc_create_single("fs/netfs/stats", S_IFREG | 0444, NULL,
+ netfs_stats_show))
+ goto error_proc;
+#endif
+
+ ret = fscache_init();
+ if (ret < 0)
+ goto error_proc;
+ return 0;
+
+error_proc:
+ remove_proc_entry("fs/netfs", NULL);
+error:
+ return ret;
+}
+fs_initcall(netfs_init);
+
+static void __exit netfs_exit(void)
+{
+ fscache_exit();
+ remove_proc_entry("fs/netfs", NULL);
+}
+module_exit(netfs_exit);
diff --git a/fs/netfs/stats.c b/fs/netfs/stats.c
index 5510a7a14a40..6025dc485f7e 100644
--- a/fs/netfs/stats.c
+++ b/fs/netfs/stats.c
@@ -28,31 +28,32 @@ atomic_t netfs_n_rh_write_done;
atomic_t netfs_n_rh_write_failed;
atomic_t netfs_n_rh_write_zskip;

-void netfs_stats_show(struct seq_file *m)
+int netfs_stats_show(struct seq_file *m, void *v)
{
- seq_printf(m, "RdHelp : RA=%u RP=%u WB=%u WBZ=%u rr=%u sr=%u\n",
+ seq_printf(m, "Netfs : RA=%u RP=%u WB=%u WBZ=%u rr=%u sr=%u\n",
atomic_read(&netfs_n_rh_readahead),
atomic_read(&netfs_n_rh_readpage),
atomic_read(&netfs_n_rh_write_begin),
atomic_read(&netfs_n_rh_write_zskip),
atomic_read(&netfs_n_rh_rreq),
atomic_read(&netfs_n_rh_sreq));
- seq_printf(m, "RdHelp : ZR=%u sh=%u sk=%u\n",
+ seq_printf(m, "Netfs : ZR=%u sh=%u sk=%u\n",
atomic_read(&netfs_n_rh_zero),
atomic_read(&netfs_n_rh_short_read),
atomic_read(&netfs_n_rh_write_zskip));
- seq_printf(m, "RdHelp : DL=%u ds=%u df=%u di=%u\n",
+ seq_printf(m, "Netfs : DL=%u ds=%u df=%u di=%u\n",
atomic_read(&netfs_n_rh_download),
atomic_read(&netfs_n_rh_download_done),
atomic_read(&netfs_n_rh_download_failed),
atomic_read(&netfs_n_rh_download_instead));
- seq_printf(m, "RdHelp : RD=%u rs=%u rf=%u\n",
+ seq_printf(m, "Netfs : RD=%u rs=%u rf=%u\n",
atomic_read(&netfs_n_rh_read),
atomic_read(&netfs_n_rh_read_done),
atomic_read(&netfs_n_rh_read_failed));
- seq_printf(m, "RdHelp : WR=%u ws=%u wf=%u\n",
+ seq_printf(m, "Netfs : WR=%u ws=%u wf=%u\n",
atomic_read(&netfs_n_rh_write),
atomic_read(&netfs_n_rh_write_done),
atomic_read(&netfs_n_rh_write_failed));
+ return fscache_stats_show(m);
}
EXPORT_SYMBOL(netfs_stats_show);
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index d294ff8f9ae4..9bd91cd615d5 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -294,7 +294,6 @@ void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
enum netfs_sreq_ref_trace what);
void netfs_put_subrequest(struct netfs_io_subrequest *subreq,
bool was_async, enum netfs_sreq_ref_trace what);
-void netfs_stats_show(struct seq_file *);
ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,
struct iov_iter *new,
iov_iter_extraction_t extraction_flags);

Next message: David Howells: "[PATCH v4 06/39] netfs: Add a procfile to list in-progress requests"
Previous message: David Howells: "[PATCH v4 03/39] netfs, fscache: Remove ->begin_cache_operation"
In reply to: David Howells: "[PATCH v4 03/39] netfs, fscache: Remove ->begin_cache_operation"
Next in thread: David Howells: "[PATCH v4 06/39] netfs: Add a procfile to list in-progress requests"
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