From: Trond Myklebust Date: Sun, 22 Feb 2015 21:35:36 +0000 (-0500) Subject: NFS: Don't invalidate a submounted dentry in nfs_prime_dcache() X-Git-Tag: omap-for-v4.1/wl12xx-dt~60^2~12 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c441c254eea2354d686be7f5544bcd79fb6a61f;p=pandora-kernel.git NFS: Don't invalidate a submounted dentry in nfs_prime_dcache() If we're traversing a directory which contains a submounted filesystem, or one that has a referral, the NFS server that is processing the READDIR request will often return information for the underlying (mounted-on) directory. It may, or may not, also return filehandle information. If this happens, and the lookup in nfs_prime_dcache() returns the dentry for the submounted directory, the filehandle comparison will fail, and we call d_invalidate(). Post-commit 8ed936b5671bf ("vfs: Lazily remove mounts on unlinked files and directories."), this means the entire subtree is unmounted. The following minimal patch addresses this problem by punting on the invalidation if there is a submount. Kudos to Neil Brown for having tracked down this issue (see link). Reported-by: Nix Link: http://lkml.kernel.org/r/87iofju9ht.fsf@spindle.srvr.nix Cc: stable@vger.kernel.org # 3.18+ Signed-off-by: Trond Myklebust --- Reading git-diff-tree failed