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Commit 8447891f authored by Michael Ellerman's avatar Michael Ellerman Committed by Greg Kroah-Hartman
Browse files

debugfs: Add debugfs_create_u64() 



I went to use this the other day, only to find it didn't exist.

It's a straight copy of the debugfs u32 code, then s/u32/u64/. A quick
test shows it seems to be working.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 3106d46f

fs/debugfs/file.c

+42 −0
Original line number Diff line number Diff line
@@ -179,6 +179,48 @@ struct dentry *debugfs_create_u32(const char *name, mode_t mode, 
}

EXPORT_SYMBOL_GPL(debugfs_create_u32);



static void debugfs_u64_set(void *data, u64 val)

{

	*(u64 *)data = val;

}



static u64 debugfs_u64_get(void *data)

{

	return *(u64 *)data;

}

DEFINE_SIMPLE_ATTRIBUTE(fops_u64, debugfs_u64_get, debugfs_u64_set, "%llu\n");



/**

 * debugfs_create_u64 - create a debugfs file that is used to read and write an unsigned 64-bit 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.

 *

 * This function creates a file in debugfs with the given name that

 * contains the value of the variable @value.  If the @mode variable is so

 * set, it can be read from, and written to.

 *

 * This function will return a pointer to a dentry if it succeeds.  This

 * pointer must be passed to the debugfs_remove() function when the file is

 * to be removed (no automatic cleanup happens if your module is unloaded,

 * you are responsible here.)  If an error occurs, %NULL will be returned.

 *

 * If debugfs is not enabled in the kernel, the value -%ENODEV will be

 * returned.  It is not wise to check for this value, but rather, check for

 * %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling

 * code.

 */

struct dentry *debugfs_create_u64(const char *name, mode_t mode,

				 struct dentry *parent, u64 *value)

{

	return debugfs_create_file(name, mode, parent, value, &fops_u64);

}

EXPORT_SYMBOL_GPL(debugfs_create_u64);



static ssize_t read_file_bool(struct file *file, char __user *user_buf,

			      size_t count, loff_t *ppos)

{

include/linux/debugfs.h

+9 −0
Original line number Diff line number Diff line
@@ -44,6 +44,8 @@ struct dentry *debugfs_create_u16(const char *name, mode_t mode, 
				  struct dentry *parent, u16 *value);

struct dentry *debugfs_create_u32(const char *name, mode_t mode,

				  struct dentry *parent, u32 *value);

struct dentry *debugfs_create_u64(const char *name, mode_t mode,

				  struct dentry *parent, u64 *value);

struct dentry *debugfs_create_bool(const char *name, mode_t mode,

				  struct dentry *parent, u32 *value);
@@ -104,6 +106,13 @@ static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode, 
	return ERR_PTR(-ENODEV);

}



static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,

						struct dentry *parent,

						u64 *value)

{

	return ERR_PTR(-ENODEV);

}



static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,

						 struct dentry *parent,

						 u32 *value)