Eric, Am 16.05.2017 um 01:25 schrieb Eric Biggers: > On Mon, May 15, 2017 at 09:51:03PM +0200, Richard Weinberger wrote: >>> >>> The test is repeatedly creating and removing a directory "dir" while lookups are >>> being done in it. It seems the problem is that many dentries are being created >>> for "dir", and they pin many different inodes, all at the same time. This >>> actually happens for ext4 too; it just doesn't cause an observable error. >>> >>> I doubt it's the right solution to make fscrypt_d_revalidate() look at >>> ->i_nlink, since ->d_revalidate() is meant to validate the filename, not the >>> inode. I think there is probably a VFS bug that is causing the dentries to not >>> be freed. >> >> Not sure. Al? :-) >> > > I can reproduce this on an unencrypted directory after updating path_init() in > fs/namei.c to always clear LOOKUP_RCU, so that all path lookups are done in > ref-walk mode. So I think fscrypt_d_revalidate() was only relevant because it > causes all path lookups to drop out of rcu-walk mode. On ext4 or UBIFS? Thanks, //richard
