Commit 5e078787 authored by Inaky Perez-Gonzalez's avatar Inaky Perez-Gonzalez Committed by Greg Kroah-Hartman
Browse files

debugfs: add helpers for exporting a size_t simple value 



In the same spirit as debugfs_create_*(), introduce helpers for
exporting size_t values over debugfs.

The only trick done is that the format verifier is kept at %llu
instead of %zu; otherwise type warnings would pop up:

format ‘%zu’ expects type ‘size_t’, but argument 2 has type ‘long long unsigned int’

There is no real way to fix this one--however, we can consider %llu
and %zu to be compatible if we consider that we are using the same for
validating in debugfs_create_{x,u}{8,16,32}().

Signed-off-by: default avatarInaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 34c65d82

fs/debugfs/file.c

+32 −0
Original line number Diff line number Diff line
@@ -294,6 +294,38 @@ struct dentry *debugfs_create_x32(const char *name, mode_t mode, 
}

EXPORT_SYMBOL_GPL(debugfs_create_x32);





static int debugfs_size_t_set(void *data, u64 val)

{

	*(size_t *)data = val;

	return 0;

}

static int debugfs_size_t_get(void *data, u64 *val)

{

	*val = *(size_t *)data;

	return 0;

}

DEFINE_SIMPLE_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set,

			"%llu\n");	/* %llu and %zu are more or less the same */



/**

 * debugfs_create_size_t - create a debugfs file that is used to read and write an size_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_size_t(const char *name, mode_t mode,

				     struct dentry *parent, size_t *value)

{

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

}

EXPORT_SYMBOL_GPL(debugfs_create_size_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
Original line number Diff line number Diff line
@@ -63,6 +63,8 @@ struct dentry *debugfs_create_x16(const char *name, mode_t mode, 
				  struct dentry *parent, u16 *value);

struct dentry *debugfs_create_x32(const char *name, mode_t mode,

				  struct dentry *parent, u32 *value);

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

				     struct dentry *parent, size_t *value);

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

				  struct dentry *parent, u32 *value);

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