diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2023-11-24 17:25:26 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2023-11-27 11:24:55 +0100 |
| commit | 8c88a474357ead632b07c70bf7f119ace8c3b39e (patch) | |
| tree | 31c18cdb506b19cef567f05306f958c3d65c9dfa /include/linux/debugfs.h | |
| parent | f4acfcd4deb158b96595250cc332901b282d15b0 (diff) | |
debugfs: add API to allow debugfs operations cancellation
In some cases there might be longer-running hardware accesses
in debugfs files, or attempts to acquire locks, and we want
to still be able to quickly remove the files.
Introduce a cancellations API to use inside the debugfs handler
functions to be able to cancel such operations on a per-file
basis.
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'include/linux/debugfs.h')
| -rw-r--r-- | include/linux/debugfs.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h index ea2d919fd9c7..c9c65b132c0f 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -171,6 +171,25 @@ ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf, ssize_t debugfs_read_file_str(struct file *file, char __user *user_buf, size_t count, loff_t *ppos); +/** + * struct debugfs_cancellation - cancellation data + * @list: internal, for keeping track + * @cancel: callback to call + * @cancel_data: extra data for the callback to call + */ +struct debugfs_cancellation { + struct list_head list; + void (*cancel)(struct dentry *, void *); + void *cancel_data; +}; + +void __acquires(cancellation) +debugfs_enter_cancellation(struct file *file, + struct debugfs_cancellation *cancellation); +void __releases(cancellation) +debugfs_leave_cancellation(struct file *file, + struct debugfs_cancellation *cancellation); + #else #include <linux/err.h> |