Restore shmid as inode# to fix /proc/pid/maps ABI breakage

shmid used to be stored as inode# for shared memory segments. Some of
the proc-ps tools use this from /proc/pid/maps.  Recent cleanups
to newseg() changed it.  This patch sets inode number back to shared
memory id to fix breakage.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Cc: "Albert Cahalan" <acahalan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index 4fefbad7096d..02faa54dbf5a 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -397,6 +397,11 @@ static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
         shp->shm_nattch = 0;
         shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
         shp->shm_file = file;
+        /*
+         * shmid gets reported as "inode#" in /proc/pid/maps.
+         * proc-ps tools use this. Changing this will break them.
+         */
+        file->f_dentry->d_inode->i_ino = shp->id;
 
         ns->shm_tot += numpages;
         shm_unlock(shp);