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fsnotify: generalize iteration of marks by object type

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Make some code that handles marks of object types inode and vfsmount
generic, so it can handle other object types.

Introduce fsnotify_foreach_obj_type macro to iterate marks by object type
and fsnotify_iter_{should|set}_report_type macros to set/test report_mask.

This is going to be used for adding mark of another object type
(super block mark).

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-04-20 16:10:52 -07:00 • committed by Jan Kara
parent d9a6f30bb8
commit 47d9c7cc45
4 changed files with 72 additions and 39 deletions
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28
include/linux/fsnotify_backend.h
View file

@ -211,23 +211,45 @@ enum fsnotify_obj_type {
#define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
struct fsnotify_iter_info {
struct fsnotify_mark *inode_mark;
struct fsnotify_mark *vfsmount_mark;
struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
unsigned int report_mask;
int srcu_idx;
};
static inline bool fsnotify_iter_should_report_type(
struct fsnotify_iter_info *iter_info, int type)
{
return (iter_info->report_mask & (1U << type));
}
static inline void fsnotify_iter_set_report_type(
struct fsnotify_iter_info *iter_info, int type)
{
iter_info->report_mask |= (1U << type);
}
static inline void fsnotify_iter_set_report_type_mark(
struct fsnotify_iter_info *iter_info, int type,
struct fsnotify_mark *mark)
{
iter_info->marks[type] = mark;
iter_info->report_mask |= (1U << type);
}
#define FSNOTIFY_ITER_FUNCS(name, NAME) \
static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \
struct fsnotify_iter_info *iter_info) \
{ \
return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \
iter_info->name##_mark : NULL; \
iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \
}
FSNOTIFY_ITER_FUNCS(inode, INODE)
FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
#define fsnotify_foreach_obj_type(type) \
for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
/*
* Inode / vfsmount point to this structure which tracks all marks attached to
* the inode / vfsmount. The reference to inode / vfsmount is held by this