From cf4ce59b3b70238352c7f1729f0f7223214828ad Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 20 Sep 2024 01:46:19 +0000
Subject: [PATCH] rtl88x2CE_WiFi_linux add concurrent mode
---
kernel/fs/notify/fanotify/fanotify.h | 281 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 255 insertions(+), 26 deletions(-)
diff --git a/kernel/fs/notify/fanotify/fanotify.h b/kernel/fs/notify/fanotify/fanotify.h
index 8609ba0..896c819 100644
--- a/kernel/fs/notify/fanotify/fanotify.h
+++ b/kernel/fs/notify/fanotify/fanotify.h
@@ -2,25 +2,240 @@
#include <linux/fsnotify_backend.h>
#include <linux/path.h>
#include <linux/slab.h>
+#include <linux/exportfs.h>
extern struct kmem_cache *fanotify_mark_cache;
-extern struct kmem_cache *fanotify_event_cachep;
+extern struct kmem_cache *fanotify_fid_event_cachep;
+extern struct kmem_cache *fanotify_path_event_cachep;
extern struct kmem_cache *fanotify_perm_event_cachep;
-/*
- * Structure for normal fanotify events. It gets allocated in
- * fanotify_handle_event() and freed when the information is retrieved by
- * userspace
- */
-struct fanotify_event_info {
- struct fsnotify_event fse;
- /*
- * We hold ref to this path so it may be dereferenced at any point
- * during this object's lifetime
- */
- struct path path;
- struct pid *tgid;
+/* Possible states of the permission event */
+enum {
+ FAN_EVENT_INIT,
+ FAN_EVENT_REPORTED,
+ FAN_EVENT_ANSWERED,
+ FAN_EVENT_CANCELED,
};
+
+/*
+ * 3 dwords are sufficient for most local fs (64bit ino, 32bit generation).
+ * fh buf should be dword aligned. On 64bit arch, the ext_buf pointer is
+ * stored in either the first or last 2 dwords.
+ */
+#define FANOTIFY_INLINE_FH_LEN (3 << 2)
+#define FANOTIFY_FH_HDR_LEN offsetof(struct fanotify_fh, buf)
+
+/* Fixed size struct for file handle */
+struct fanotify_fh {
+ u8 type;
+ u8 len;
+#define FANOTIFY_FH_FLAG_EXT_BUF 1
+ u8 flags;
+ u8 pad;
+ unsigned char buf[];
+} __aligned(4);
+
+/* Variable size struct for dir file handle + child file handle + name */
+struct fanotify_info {
+ /* size of dir_fh/file_fh including fanotify_fh hdr size */
+ u8 dir_fh_totlen;
+ u8 file_fh_totlen;
+ u8 name_len;
+ u8 pad;
+ unsigned char buf[];
+ /*
+ * (struct fanotify_fh) dir_fh starts at buf[0]
+ * (optional) file_fh starts at buf[dir_fh_totlen]
+ * name starts at buf[dir_fh_totlen + file_fh_totlen]
+ */
+} __aligned(4);
+
+static inline bool fanotify_fh_has_ext_buf(struct fanotify_fh *fh)
+{
+ return (fh->flags & FANOTIFY_FH_FLAG_EXT_BUF);
+}
+
+static inline char **fanotify_fh_ext_buf_ptr(struct fanotify_fh *fh)
+{
+ BUILD_BUG_ON(FANOTIFY_FH_HDR_LEN % 4);
+ BUILD_BUG_ON(__alignof__(char *) - 4 + sizeof(char *) >
+ FANOTIFY_INLINE_FH_LEN);
+ return (char **)ALIGN((unsigned long)(fh->buf), __alignof__(char *));
+}
+
+static inline void *fanotify_fh_ext_buf(struct fanotify_fh *fh)
+{
+ return *fanotify_fh_ext_buf_ptr(fh);
+}
+
+static inline void *fanotify_fh_buf(struct fanotify_fh *fh)
+{
+ return fanotify_fh_has_ext_buf(fh) ? fanotify_fh_ext_buf(fh) : fh->buf;
+}
+
+static inline int fanotify_info_dir_fh_len(struct fanotify_info *info)
+{
+ if (!info->dir_fh_totlen ||
+ WARN_ON_ONCE(info->dir_fh_totlen < FANOTIFY_FH_HDR_LEN))
+ return 0;
+
+ return info->dir_fh_totlen - FANOTIFY_FH_HDR_LEN;
+}
+
+static inline struct fanotify_fh *fanotify_info_dir_fh(struct fanotify_info *info)
+{
+ BUILD_BUG_ON(offsetof(struct fanotify_info, buf) % 4);
+
+ return (struct fanotify_fh *)info->buf;
+}
+
+static inline int fanotify_info_file_fh_len(struct fanotify_info *info)
+{
+ if (!info->file_fh_totlen ||
+ WARN_ON_ONCE(info->file_fh_totlen < FANOTIFY_FH_HDR_LEN))
+ return 0;
+
+ return info->file_fh_totlen - FANOTIFY_FH_HDR_LEN;
+}
+
+static inline struct fanotify_fh *fanotify_info_file_fh(struct fanotify_info *info)
+{
+ return (struct fanotify_fh *)(info->buf + info->dir_fh_totlen);
+}
+
+static inline const char *fanotify_info_name(struct fanotify_info *info)
+{
+ return info->buf + info->dir_fh_totlen + info->file_fh_totlen;
+}
+
+static inline void fanotify_info_init(struct fanotify_info *info)
+{
+ info->dir_fh_totlen = 0;
+ info->file_fh_totlen = 0;
+ info->name_len = 0;
+}
+
+static inline void fanotify_info_copy_name(struct fanotify_info *info,
+ const struct qstr *name)
+{
+ info->name_len = name->len;
+ strcpy(info->buf + info->dir_fh_totlen + info->file_fh_totlen,
+ name->name);
+}
+
+/*
+ * Common structure for fanotify events. Concrete structs are allocated in
+ * fanotify_handle_event() and freed when the information is retrieved by
+ * userspace. The type of event determines how it was allocated, how it will
+ * be freed and which concrete struct it may be cast to.
+ */
+enum fanotify_event_type {
+ FANOTIFY_EVENT_TYPE_FID, /* fixed length */
+ FANOTIFY_EVENT_TYPE_FID_NAME, /* variable length */
+ FANOTIFY_EVENT_TYPE_PATH,
+ FANOTIFY_EVENT_TYPE_PATH_PERM,
+ FANOTIFY_EVENT_TYPE_OVERFLOW, /* struct fanotify_event */
+};
+
+struct fanotify_event {
+ struct fsnotify_event fse;
+ u32 mask;
+ enum fanotify_event_type type;
+ struct pid *pid;
+};
+
+static inline void fanotify_init_event(struct fanotify_event *event,
+ unsigned long id, u32 mask)
+{
+ fsnotify_init_event(&event->fse, id);
+ event->mask = mask;
+ event->pid = NULL;
+}
+
+struct fanotify_fid_event {
+ struct fanotify_event fae;
+ __kernel_fsid_t fsid;
+ struct fanotify_fh object_fh;
+ /* Reserve space in object_fh.buf[] - access with fanotify_fh_buf() */
+ unsigned char _inline_fh_buf[FANOTIFY_INLINE_FH_LEN];
+};
+
+static inline struct fanotify_fid_event *
+FANOTIFY_FE(struct fanotify_event *event)
+{
+ return container_of(event, struct fanotify_fid_event, fae);
+}
+
+struct fanotify_name_event {
+ struct fanotify_event fae;
+ __kernel_fsid_t fsid;
+ struct fanotify_info info;
+};
+
+static inline struct fanotify_name_event *
+FANOTIFY_NE(struct fanotify_event *event)
+{
+ return container_of(event, struct fanotify_name_event, fae);
+}
+
+static inline __kernel_fsid_t *fanotify_event_fsid(struct fanotify_event *event)
+{
+ if (event->type == FANOTIFY_EVENT_TYPE_FID)
+ return &FANOTIFY_FE(event)->fsid;
+ else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
+ return &FANOTIFY_NE(event)->fsid;
+ else
+ return NULL;
+}
+
+static inline struct fanotify_fh *fanotify_event_object_fh(
+ struct fanotify_event *event)
+{
+ if (event->type == FANOTIFY_EVENT_TYPE_FID)
+ return &FANOTIFY_FE(event)->object_fh;
+ else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
+ return fanotify_info_file_fh(&FANOTIFY_NE(event)->info);
+ else
+ return NULL;
+}
+
+static inline struct fanotify_info *fanotify_event_info(
+ struct fanotify_event *event)
+{
+ if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
+ return &FANOTIFY_NE(event)->info;
+ else
+ return NULL;
+}
+
+static inline int fanotify_event_object_fh_len(struct fanotify_event *event)
+{
+ struct fanotify_info *info = fanotify_event_info(event);
+ struct fanotify_fh *fh = fanotify_event_object_fh(event);
+
+ if (info)
+ return info->file_fh_totlen ? fh->len : 0;
+ else
+ return fh ? fh->len : 0;
+}
+
+static inline int fanotify_event_dir_fh_len(struct fanotify_event *event)
+{
+ struct fanotify_info *info = fanotify_event_info(event);
+
+ return info ? fanotify_info_dir_fh_len(info) : 0;
+}
+
+struct fanotify_path_event {
+ struct fanotify_event fae;
+ struct path path;
+};
+
+static inline struct fanotify_path_event *
+FANOTIFY_PE(struct fanotify_event *event)
+{
+ return container_of(event, struct fanotify_path_event, fae);
+}
/*
* Structure for permission fanotify events. It gets allocated and freed in
@@ -29,29 +244,43 @@
* group->notification_list to group->fanotify_data.access_list to wait for
* user response.
*/
-struct fanotify_perm_event_info {
- struct fanotify_event_info fae;
- int response; /* userspace answer to question */
+struct fanotify_perm_event {
+ struct fanotify_event fae;
+ struct path path;
+ unsigned short response; /* userspace answer to the event */
+ unsigned short state; /* state of the event */
int fd; /* fd we passed to userspace for this event */
};
-static inline struct fanotify_perm_event_info *
-FANOTIFY_PE(struct fsnotify_event *fse)
+static inline struct fanotify_perm_event *
+FANOTIFY_PERM(struct fanotify_event *event)
{
- return container_of(fse, struct fanotify_perm_event_info, fae.fse);
+ return container_of(event, struct fanotify_perm_event, fae);
}
static inline bool fanotify_is_perm_event(u32 mask)
{
return IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS) &&
- mask & FAN_ALL_PERM_EVENTS;
+ mask & FANOTIFY_PERM_EVENTS;
}
-static inline struct fanotify_event_info *FANOTIFY_E(struct fsnotify_event *fse)
+static inline struct fanotify_event *FANOTIFY_E(struct fsnotify_event *fse)
{
- return container_of(fse, struct fanotify_event_info, fse);
+ return container_of(fse, struct fanotify_event, fse);
}
-struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
- struct inode *inode, u32 mask,
- const struct path *path);
+static inline bool fanotify_event_has_path(struct fanotify_event *event)
+{
+ return event->type == FANOTIFY_EVENT_TYPE_PATH ||
+ event->type == FANOTIFY_EVENT_TYPE_PATH_PERM;
+}
+
+static inline struct path *fanotify_event_path(struct fanotify_event *event)
+{
+ if (event->type == FANOTIFY_EVENT_TYPE_PATH)
+ return &FANOTIFY_PE(event)->path;
+ else if (event->type == FANOTIFY_EVENT_TYPE_PATH_PERM)
+ return &FANOTIFY_PERM(event)->path;
+ else
+ return NULL;
+}
--
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