From: Andrey Vagin Date: Mon, 7 Apr 2014 22:38:34 +0000 (-0700) Subject: proc: show mnt_id in /proc/pid/fdinfo X-Git-Tag: v3.15-rc1~57^2~70 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49d063cb353265c3af701bab215ac438ca7df36d;p=pandora-kernel.git proc: show mnt_id in /proc/pid/fdinfo Currently we don't have a way how to determing from which mount point file has been opened. This information is required for proper dumping and restoring file descriptos due to presence of mount namespaces. It's possible, that two file descriptors are opened using the same paths, but one fd references mount point from one namespace while the other fd -- from other namespace. $ ls -l /proc/1/fd/1 lrwx------ 1 root root 64 Mar 19 23:54 /proc/1/fd/1 -> /dev/null $ cat /proc/1/fdinfo/1 pos: 0 flags: 0100002 mnt_id: 16 $ cat /proc/1/mountinfo | grep ^16 16 32 0:4 / /dev rw,nosuid shared:2 - devtmpfs devtmpfs rw,size=1013356k,nr_inodes=253339,mode=755 Signed-off-by: Andrey Vagin Acked-by: Pavel Emelyanov Acked-by: Cyrill Gorcunov Cc: Rob Landley Cc: Al Viro Cc: Oleg Nesterov Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed