tree 471f4930a15a15c6e482fc0284fef824e02dcee4
parent 9c3e9025a3f7ed25c99a0add8af65431c8043800
author Al Viro <viro@zeniv.linux.org.uk> 1526072599 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1526927410 -0400

nfsd: vfs_mkdir() might succeed leaving dentry negative unhashed

That can (and does, on some filesystems) happen - ->mkdir() (and thus
vfs_mkdir()) can legitimately leave its argument negative and just
unhash it, counting upon the lookup to pick the object we'd created
next time we try to look at that name.

Some vfs_mkdir() callers forget about that possibility...

Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>