diff options
authorInaky Perez-Gonzalez <inaky@linux.intel.com>2008-12-20 16:57:39 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-01-07 10:00:16 -0800
commit5e07878787ad07361571150230cc3a8d522ae046 (patch)
parent34c65d82e02147331701c7795e3144d511adf4e9 (diff)
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: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2 files changed, 34 insertions, 0 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 159a5efd6a8..33a90120f6a 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -294,6 +294,38 @@ struct dentry *debugfs_create_x32(const char *name, mode_t mode,
+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);
static ssize_t read_file_bool(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index e1a6c046cea..23936b16426 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -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);