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debugfs: add helpers for exporting a size_t simple value

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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: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Inaky Perez-Gonzalez 2008-12-20 16:57:39 -08:00 committed by Greg Kroah-Hartman
parent 34c65d82e0
commit 5e07878787
2 changed files with 34 additions and 0 deletions
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32
fs/debugfs/file.c
View File

@ -294,6 +294,38 @@ struct dentry *debugfs_create_x32(const char *name, mode_t mode,
} }
EXPORT_SYMBOL_GPL(debugfs_create_x32); 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, static ssize_t read_file_bool(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos) size_t count, loff_t *ppos)
{ {

2
include/linux/debugfs.h
View File

@ -63,6 +63,8 @@ struct dentry *debugfs_create_x16(const char *name, mode_t mode,
struct dentry *parent, u16 *value); struct dentry *parent, u16 *value);
struct dentry *debugfs_create_x32(const char *name, mode_t mode, struct dentry *debugfs_create_x32(const char *name, mode_t mode,
struct dentry *parent, u32 *value); 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 *debugfs_create_bool(const char *name, mode_t mode,
struct dentry *parent, u32 *value); struct dentry *parent, u32 *value);