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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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32
fs/notify/mark.c
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@@ -120,14 +120,14 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
new_mask |= mark->mask;
}
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
conn->inode->i_fsnotify_mask = new_mask;
fsnotify_conn_inode(conn)->i_fsnotify_mask = new_mask;
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
real_mount(conn->mnt)->mnt_fsnotify_mask = new_mask;
fsnotify_conn_mount(conn)->mnt_fsnotify_mask = new_mask;
}
/*
* Calculate mask of events for a list of marks. The caller must make sure
* connector and connector->inode cannot disappear under us. Callers achieve
* connector and connector->obj cannot disappear under us. Callers achieve
* this by holding a mark->lock or mark->group->mark_mutex for a mark on this
* list.
*/
@@ -140,7 +140,8 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
__fsnotify_recalc_mask(conn);
spin_unlock(&conn->lock);
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
__fsnotify_update_child_dentry_flags(conn->inode);
__fsnotify_update_child_dentry_flags(
fsnotify_conn_inode(conn));
}
/* Free all connectors queued for freeing once SRCU period ends */
@@ -166,20 +167,20 @@ static struct inode *fsnotify_detach_connector_from_object(
{
struct inode *inode = NULL;
if (conn->type == FSNOTIFY_OBJ_TYPE_DETACHED)
return NULL;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) {
inode = conn->inode;
rcu_assign_pointer(inode->i_fsnotify_marks, NULL);
inode = fsnotify_conn_inode(conn);
inode->i_fsnotify_mask = 0;
conn->inode = NULL;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
} else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
rcu_assign_pointer(real_mount(conn->mnt)->mnt_fsnotify_marks,
NULL);
real_mount(conn->mnt)->mnt_fsnotify_mask = 0;
conn->mnt = NULL;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
fsnotify_conn_mount(conn)->mnt_fsnotify_mask = 0;
}
rcu_assign_pointer(*(conn->obj), NULL);
conn->obj = NULL;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
return inode;
}
@@ -448,10 +449,9 @@ static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
spin_lock_init(&conn->lock);
INIT_HLIST_HEAD(&conn->list);
conn->type = type;
conn->obj = connp;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
inode = conn->inode = igrab(fsnotify_obj_inode(connp));
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
conn->mnt = &fsnotify_obj_mount(connp)->mnt;
inode = igrab(fsnotify_conn_inode(conn));
/*
* cmpxchg() provides the barrier so that readers of *connp can see
* only initialized structure