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authorJeff Layton <jlayton@redhat.com>2010-05-11 14:59:55 -0400
committerSteve French <sfrench@us.ibm.com>2010-05-11 20:57:50 +0000
commit3d69438031b00c601c991ab447cafb7d5c3c59a6 (patch)
treef40d66a255c4169b43079252a4c96868c097ddab /virt/kvm/ioapic.h
parent05ce7bfe547c9fa967d9cab6c37867a9cb6fb3fa (diff)
downloadlinux-3d69438031b00c601c991ab447cafb7d5c3c59a6.tar.bz2
cifs: guard against hardlinking directories
When we made serverino the default, we trusted that the field sent by the server in the "uniqueid" field was actually unique. It turns out that it isn't reliably so. Samba, in particular, will just put the st_ino in the uniqueid field when unix extensions are enabled. When a share spans multiple filesystems, it's quite possible that there will be collisions. This is a server bug, but when the inodes in question are a directory (as is often the case) and there is a collision with the root inode of the mount, the result is a kernel panic on umount. Fix this by checking explicitly for directory inodes with the same uniqueid. If that is the case, then we can assume that using server inode numbers will be a problem and that they should be disabled. Fixes Samba bugzilla 7407 Signed-off-by: Jeff Layton <jlayton@redhat.com> CC: Stable <stable@kernel.org> Reviewed-and-Tested-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
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