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fs/debugfs: add get/set for atomic_long types

PATCH In review Ganesh Mahendran 2 participants 4 messages Dec 11, 2014 – Jan 9, 2015 Driver core

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Ganesh Mahendran

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#0 lore raw

PATCH 1/1 fs/debugfs: add get/set for atomic_long types

debugfs currently can not create attributes that set/get atomic_long_t values.

This patch adds support for this through a new
debugfs_create_atomic_long_t() function.

Signed-off-by Ganesh Mahendran <[email protected]>
---
 fs/debugfs/file.c       |   45 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/debugfs.h |    2 ++
 2 files changed, 47 insertions(+)
fs/debugfs/file.c +45 -0
index 76c08c2..65a1b53 100644
@@ -446,6 +446,51 @@ struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
 }
 EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
 
+static int debugfs_atomic_long_t_set(void *data, u64 val)
+{
+	atomic_long_set((atomic_long_t *)data, val);
+	return 0;
+}
+static int debugfs_atomic_long_t_get(void *data, u64 *val)
+{
+	*val = atomic_long_read((atomic_long_t *)data);
+	return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_long_t, debugfs_atomic_long_t_get,
+			debugfs_atomic_long_t_set, "%lld\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_long_t_ro, debugfs_atomic_long_t_get,
+			NULL, "%lld\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_long_t_wo, NULL, debugfs_atomic_long_t_set,
+			"%lld\n");
+
+/**
+ * debugfs_create_atomic_long_t - create a debugfs file that is used to read and
+ * write an atomic_long_t value
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this parameter is %NULL, then the
+ *          file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ *         from.
+ */
+struct dentry *debugfs_create_atomic_long_t(const char *name, umode_t mode,
+				 struct dentry *parent, atomic_long_t *value)
+{
+	/* if there are no write bits set, make read only */
+	if (!(mode & S_IWUGO))
+		return debugfs_create_file(name, mode, parent, value,
+					&fops_atomic_long_t_ro);
+	/* if there are no read bits set, make write only */
+	if (!(mode & S_IRUGO))
+		return debugfs_create_file(name, mode, parent, value,
+					&fops_atomic_long_t_wo);
+
+	return debugfs_create_file(name, mode, parent, value,
+					&fops_atomic_long_t);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_atomic_long_t);
+
 static ssize_t read_file_bool(struct file *file, char __user *user_buf,
 			      size_t count, loff_t *ppos)
 {
include/linux/debugfs.h +2 -0
index 4d0b4d1..b759231 100644
@@ -81,6 +81,8 @@ struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
 				     struct dentry *parent, size_t *value);
 struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
 				     struct dentry *parent, atomic_t *value);
+struct dentry *debugfs_create_atomic_long_t(const char *name, umode_t mode,
+				 struct dentry *parent, atomic_long_t *value);
 struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 				  struct dentry *parent, u32 *value);
Signature · 1 line
1.7.9.5
maintainer
#1 lore raw
Quoted 11 lines · Ganesh Mahendran

debugfs currently can not create attributes that set/get atomic_long_t values.

This patch adds support for this through a new
debugfs_create_atomic_long_t() function.

Signed-off-by Ganesh Mahendran <[email protected]>
---
 fs/debugfs/file.c       |   45 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/debugfs.h |    2 ++
 2 files changed, 47 insertions(+)

Do you have kernel code that depends on this?

It's the middle of the merge window, so this will have to wait until after 3.19-rc1, ok?

thanks,

greg k-h

author
#2 lore raw

Hello Greg:

2014-12-11 22:45 GMT+08:00 Greg KH <[email protected]>:

Quoted 7 lines · Ganesh Mahendran
Quoted 6 lines

debugfs currently can not create attributes that set/get atomic_long_t values.

This patch adds support for this through a new
debugfs_create_atomic_long_t() function.

Quoted 7 lines
Quoted 5 lines
Signed-off-by Ganesh Mahendran <[email protected]>
---
 fs/debugfs/file.c       |   45 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/debugfs.h |    2 ++
 2 files changed, 47 insertions(+)

Do you have kernel code that depends on this?

Currently there is no code that is depending on this.
I found there is not a debugfs API to get/set atomic_long_t when I was debuging mm/zsmalloc. So I sent this patch.

Quoted 3 lines

It's the middle of the merge window, so this will have to wait until after 3.19-rc1, ok?

It is OK. It is not an urgent patch.
Thanks so much!

Quoted 4 lines

thanks,

greg k-h

maintainer
#3 lore raw
In reply to Ganesh Mahendran
Quoted 11 lines · Ganesh Mahendran

debugfs currently can not create attributes that set/get atomic_long_t values.

This patch adds support for this through a new
debugfs_create_atomic_long_t() function.

Signed-off-by Ganesh Mahendran <[email protected]>
---
 fs/debugfs/file.c       |   45 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/debugfs.h |    2 ++
 2 files changed, 47 insertions(+)

I want to see the patch that uses this before I can accept this.

thanks,

greg k-h