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debugfs: Add debugfs_create_u64()

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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: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Ellerman 2007-04-17 15:59:36 +10:00 committed by Greg Kroah-Hartman
parent 3106d46f51
commit 8447891fe8
2 changed files with 51 additions and 0 deletions
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42
fs/debugfs/file.c
View file

@ -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)
{

9
include/linux/debugfs.h
View file

@ -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)