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

Badari Pulavarty
2007-06-08T22:30:08Z

Andrew,

Can you include this in -mm ?

Thanks,
Badari

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>

Index: linux-2.6.22-rc4/ipc/shm.c
===================================================================
--- linux-2.6.22-rc4.orig/ipc/shm.c 2007-06-08 15:17:20.000000000 -0700
+++ linux-2.6.22-rc4/ipc/shm.c 2007-06-08 15:19:38.000000000 -0700
@@ -397,6 +397,11 @@ static int newseg (struct ipc_namespace
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);