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fsnotify: let connector point to an abstract object

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Make the code to attach/detach a connector to object more generic
by letting the fsnotify connector point to an abstract fsnotify_connp_t.
Code that needs to dereference an inode or mount object now uses the
helpers fsnotify_conn_{inode,mount}.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein
2018-06-23 17:54:49 +03:00
committed by Jan Kara
parent b812a9f589
commit 36f10f55ff
5 changed files with 45 additions and 37 deletions
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15
include/linux/fsnotify_backend.h
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@@ -255,6 +255,13 @@ FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
#define fsnotify_foreach_obj_type(type) \
for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
/*
* fsnotify_connp_t is what we embed in objects which connector can be attached
* to. fsnotify_connp_t * is how we refer from connector back to object.
*/
struct fsnotify_mark_connector;
typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
/*
* Inode / vfsmount point to this structure which tracks all marks attached to
* the inode / vfsmount. The reference to inode / vfsmount is held by this
@@ -264,17 +271,15 @@ FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
struct fsnotify_mark_connector {
spinlock_t lock;
unsigned int type; /* Type of object [lock] */
union { /* Object pointer [lock] */
struct inode *inode;
struct vfsmount *mnt;
union {
/* Object pointer [lock] */
fsnotify_connp_t *obj;
/* Used listing heads to free after srcu period expires */
struct fsnotify_mark_connector *destroy_next;
};
struct hlist_head list;
};
typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
/*
* A mark is simply an object attached to an in core inode which allows an
* fsnotify listener to indicate they are either no longer interested in events