debugfs currently can not create attributes that set/get atomic_long_t values.
This patch adds support for this through a new debugfs_create_atomic_long_t() function. Signed-off-by: Ganesh Mahendran <[email protected]> --- fs/debugfs/file.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/debugfs.h | 2 ++ 2 files changed, 47 insertions(+) diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 76c08c2..65a1b53 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -446,6 +446,51 @@ struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode, } EXPORT_SYMBOL_GPL(debugfs_create_atomic_t); +static int debugfs_atomic_long_t_set(void *data, u64 val) +{ + atomic_long_set((atomic_long_t *)data, val); + return 0; +} +static int debugfs_atomic_long_t_get(void *data, u64 *val) +{ + *val = atomic_long_read((atomic_long_t *)data); + return 0; +} +DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_long_t, debugfs_atomic_long_t_get, + debugfs_atomic_long_t_set, "%lld\n"); +DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_long_t_ro, debugfs_atomic_long_t_get, + NULL, "%lld\n"); +DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_long_t_wo, NULL, debugfs_atomic_long_t_set, + "%lld\n"); + +/** + * debugfs_create_atomic_long_t - create a debugfs file that is used to read and + * write an atomic_long_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_atomic_long_t(const char *name, umode_t mode, + struct dentry *parent, atomic_long_t *value) +{ + /* if there are no write bits set, make read only */ + if (!(mode & S_IWUGO)) + return debugfs_create_file(name, mode, parent, value, + &fops_atomic_long_t_ro); + /* if there are no read bits set, make write only */ + if (!(mode & S_IRUGO)) + return debugfs_create_file(name, mode, parent, value, + &fops_atomic_long_t_wo); + + return debugfs_create_file(name, mode, parent, value, + &fops_atomic_long_t); +} +EXPORT_SYMBOL_GPL(debugfs_create_atomic_long_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 4d0b4d1..b759231 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -81,6 +81,8 @@ struct dentry *debugfs_create_size_t(const char *name, umode_t mode, struct dentry *parent, size_t *value); struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode, struct dentry *parent, atomic_t *value); +struct dentry *debugfs_create_atomic_long_t(const char *name, umode_t mode, + struct dentry *parent, atomic_long_t *value); struct dentry *debugfs_create_bool(const char *name, umode_t mode, struct dentry *parent, u32 *value); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
