diff options
Diffstat (limited to 'fs/notify/mark.c')
| -rw-r--r-- | fs/notify/mark.c | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c index b5172ccb2e60..d2dd16cb5989 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -181,17 +181,20 @@ static void fsnotify_connector_destroy_workfn(struct work_struct *work) } } -static struct inode *fsnotify_detach_connector_from_object( - struct fsnotify_mark_connector *conn) +static void *fsnotify_detach_connector_from_object( + struct fsnotify_mark_connector *conn, + unsigned int *type) { struct inode *inode = NULL; + *type = conn->type; if (conn->type == FSNOTIFY_OBJ_TYPE_DETACHED) return NULL; if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) { inode = fsnotify_conn_inode(conn); inode->i_fsnotify_mask = 0; + atomic_long_inc(&inode->i_sb->s_fsnotify_inode_refs); } else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) { fsnotify_conn_mount(conn)->mnt_fsnotify_mask = 0; } else if (conn->type == FSNOTIFY_OBJ_TYPE_SB) { @@ -215,10 +218,29 @@ static void fsnotify_final_mark_destroy(struct fsnotify_mark *mark) fsnotify_put_group(group); } +/* Drop object reference originally held by a connector */ +static void fsnotify_drop_object(unsigned int type, void *objp) +{ + struct inode *inode; + struct super_block *sb; + + if (!objp) + return; + /* Currently only inode references are passed to be dropped */ + if (WARN_ON_ONCE(type != FSNOTIFY_OBJ_TYPE_INODE)) + return; + inode = objp; + sb = inode->i_sb; + iput(inode); + if (atomic_long_dec_and_test(&sb->s_fsnotify_inode_refs)) + wake_up_var(&sb->s_fsnotify_inode_refs); +} + void fsnotify_put_mark(struct fsnotify_mark *mark) { struct fsnotify_mark_connector *conn; - struct inode *inode = NULL; + void *objp = NULL; + unsigned int type = FSNOTIFY_OBJ_TYPE_DETACHED; bool free_conn = false; /* Catch marks that were actually never attached to object */ @@ -238,7 +260,7 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) conn = mark->connector; hlist_del_init_rcu(&mark->obj_list); if (hlist_empty(&conn->list)) { - inode = fsnotify_detach_connector_from_object(conn); + objp = fsnotify_detach_connector_from_object(conn, &type); free_conn = true; } else { __fsnotify_recalc_mask(conn); @@ -246,7 +268,7 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) mark->connector = NULL; spin_unlock(&conn->lock); - iput(inode); + fsnotify_drop_object(type, objp); if (free_conn) { spin_lock(&destroy_lock); @@ -713,7 +735,8 @@ void fsnotify_destroy_marks(fsnotify_connp_t *connp) { struct fsnotify_mark_connector *conn; struct fsnotify_mark *mark, *old_mark = NULL; - struct inode *inode; + void *objp; + unsigned int type; conn = fsnotify_grab_connector(connp); if (!conn) @@ -739,11 +762,11 @@ void fsnotify_destroy_marks(fsnotify_connp_t *connp) * mark references get dropped. It would lead to strange results such * as delaying inode deletion or blocking unmount. */ - inode = fsnotify_detach_connector_from_object(conn); + objp = fsnotify_detach_connector_from_object(conn, &type); spin_unlock(&conn->lock); if (old_mark) fsnotify_put_mark(old_mark); - iput(inode); + fsnotify_drop_object(type, objp); } /* |