Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/fsnotify_backend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/path.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/exportfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) extern struct kmem_cache *fanotify_mark_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) extern struct kmem_cache *fanotify_fid_event_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) extern struct kmem_cache *fanotify_path_event_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) extern struct kmem_cache *fanotify_perm_event_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) /* Possible states of the permission event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	FAN_EVENT_INIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	FAN_EVENT_REPORTED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	FAN_EVENT_ANSWERED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	FAN_EVENT_CANCELED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * 3 dwords are sufficient for most local fs (64bit ino, 32bit generation).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * fh buf should be dword aligned. On 64bit arch, the ext_buf pointer is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * stored in either the first or last 2 dwords.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define FANOTIFY_INLINE_FH_LEN	(3 << 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define FANOTIFY_FH_HDR_LEN	offsetof(struct fanotify_fh, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) /* Fixed size struct for file handle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) struct fanotify_fh {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	u8 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u8 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define FANOTIFY_FH_FLAG_EXT_BUF 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	u8 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	u8 pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	unsigned char buf[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) } __aligned(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) /* Variable size struct for dir file handle + child file handle + name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) struct fanotify_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	/* size of dir_fh/file_fh including fanotify_fh hdr size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	u8 dir_fh_totlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	u8 file_fh_totlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	u8 name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	u8 pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	unsigned char buf[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	 * (struct fanotify_fh) dir_fh starts at buf[0]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	 * (optional) file_fh starts at buf[dir_fh_totlen]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	 * name starts at buf[dir_fh_totlen + file_fh_totlen]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) } __aligned(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static inline bool fanotify_fh_has_ext_buf(struct fanotify_fh *fh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return (fh->flags & FANOTIFY_FH_FLAG_EXT_BUF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static inline char **fanotify_fh_ext_buf_ptr(struct fanotify_fh *fh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	BUILD_BUG_ON(FANOTIFY_FH_HDR_LEN % 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	BUILD_BUG_ON(__alignof__(char *) - 4 + sizeof(char *) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		     FANOTIFY_INLINE_FH_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	return (char **)ALIGN((unsigned long)(fh->buf), __alignof__(char *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static inline void *fanotify_fh_ext_buf(struct fanotify_fh *fh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	return *fanotify_fh_ext_buf_ptr(fh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static inline void *fanotify_fh_buf(struct fanotify_fh *fh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return fanotify_fh_has_ext_buf(fh) ? fanotify_fh_ext_buf(fh) : fh->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static inline int fanotify_info_dir_fh_len(struct fanotify_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (!info->dir_fh_totlen ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	    WARN_ON_ONCE(info->dir_fh_totlen < FANOTIFY_FH_HDR_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return info->dir_fh_totlen - FANOTIFY_FH_HDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static inline struct fanotify_fh *fanotify_info_dir_fh(struct fanotify_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	BUILD_BUG_ON(offsetof(struct fanotify_info, buf) % 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	return (struct fanotify_fh *)info->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static inline int fanotify_info_file_fh_len(struct fanotify_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (!info->file_fh_totlen ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	    WARN_ON_ONCE(info->file_fh_totlen < FANOTIFY_FH_HDR_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return info->file_fh_totlen - FANOTIFY_FH_HDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static inline struct fanotify_fh *fanotify_info_file_fh(struct fanotify_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	return (struct fanotify_fh *)(info->buf + info->dir_fh_totlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static inline const char *fanotify_info_name(struct fanotify_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return info->buf + info->dir_fh_totlen + info->file_fh_totlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static inline void fanotify_info_init(struct fanotify_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	info->dir_fh_totlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	info->file_fh_totlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	info->name_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static inline void fanotify_info_copy_name(struct fanotify_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 					   const struct qstr *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	info->name_len = name->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	strcpy(info->buf + info->dir_fh_totlen + info->file_fh_totlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	       name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  * Common structure for fanotify events. Concrete structs are allocated in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * fanotify_handle_event() and freed when the information is retrieved by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * userspace. The type of event determines how it was allocated, how it will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * be freed and which concrete struct it may be cast to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) enum fanotify_event_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	FANOTIFY_EVENT_TYPE_FID, /* fixed length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	FANOTIFY_EVENT_TYPE_FID_NAME, /* variable length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	FANOTIFY_EVENT_TYPE_PATH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	FANOTIFY_EVENT_TYPE_PATH_PERM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	FANOTIFY_EVENT_TYPE_OVERFLOW, /* struct fanotify_event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct fanotify_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct fsnotify_event fse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	enum fanotify_event_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	struct pid *pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static inline void fanotify_init_event(struct fanotify_event *event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 				       unsigned long id, u32 mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	fsnotify_init_event(&event->fse, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	event->mask = mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	event->pid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct fanotify_fid_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct fanotify_event fae;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	__kernel_fsid_t fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	struct fanotify_fh object_fh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* Reserve space in object_fh.buf[] - access with fanotify_fh_buf() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	unsigned char _inline_fh_buf[FANOTIFY_INLINE_FH_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static inline struct fanotify_fid_event *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) FANOTIFY_FE(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	return container_of(event, struct fanotify_fid_event, fae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct fanotify_name_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct fanotify_event fae;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	__kernel_fsid_t fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	struct fanotify_info info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static inline struct fanotify_name_event *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) FANOTIFY_NE(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	return container_of(event, struct fanotify_name_event, fae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static inline __kernel_fsid_t *fanotify_event_fsid(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (event->type == FANOTIFY_EVENT_TYPE_FID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		return &FANOTIFY_FE(event)->fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return &FANOTIFY_NE(event)->fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static inline struct fanotify_fh *fanotify_event_object_fh(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 						struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (event->type == FANOTIFY_EVENT_TYPE_FID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		return &FANOTIFY_FE(event)->object_fh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		return fanotify_info_file_fh(&FANOTIFY_NE(event)->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static inline struct fanotify_info *fanotify_event_info(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 						struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		return &FANOTIFY_NE(event)->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static inline int fanotify_event_object_fh_len(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	struct fanotify_info *info = fanotify_event_info(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	struct fanotify_fh *fh = fanotify_event_object_fh(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	if (info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		return info->file_fh_totlen ? fh->len : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return fh ? fh->len : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static inline int fanotify_event_dir_fh_len(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct fanotify_info *info = fanotify_event_info(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	return info ? fanotify_info_dir_fh_len(info) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct fanotify_path_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	struct fanotify_event fae;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static inline struct fanotify_path_event *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) FANOTIFY_PE(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return container_of(event, struct fanotify_path_event, fae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  * Structure for permission fanotify events. It gets allocated and freed in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  * fanotify_handle_event() since we wait there for user response. When the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  * information is retrieved by userspace the structure is moved from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * group->notification_list to group->fanotify_data.access_list to wait for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * user response.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct fanotify_perm_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	struct fanotify_event fae;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	unsigned short response;	/* userspace answer to the event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	unsigned short state;		/* state of the event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	int fd;		/* fd we passed to userspace for this event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static inline struct fanotify_perm_event *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) FANOTIFY_PERM(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	return container_of(event, struct fanotify_perm_event, fae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static inline bool fanotify_is_perm_event(u32 mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		mask & FANOTIFY_PERM_EVENTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static inline struct fanotify_event *FANOTIFY_E(struct fsnotify_event *fse)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	return container_of(fse, struct fanotify_event, fse);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static inline bool fanotify_event_has_path(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	return event->type == FANOTIFY_EVENT_TYPE_PATH ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		event->type == FANOTIFY_EVENT_TYPE_PATH_PERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static inline struct path *fanotify_event_path(struct fanotify_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (event->type == FANOTIFY_EVENT_TYPE_PATH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return &FANOTIFY_PE(event)->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	else if (event->type == FANOTIFY_EVENT_TYPE_PATH_PERM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		return &FANOTIFY_PERM(event)->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }