On Fri, 08 Jun 2007 17:43:34 -0600
[email protected] (Eric W. Biederman) wrote:
> Some user space tools need to identify SYSV shared memory when
> examining /proc/<pid>/maps. To do so they look for a block device
> with major zero, a dentry named SYSV<sysv key>, and having the minor of
> the internal sysv shared memory kernel mount.
>
> To help these tools and to make it easier for people just browsing
> /proc/<pid>/maps this patch modifies hugetlb sysv shared memory to
> use the SYSV<key> dentry naming convention.
>
> User space tools will still have to be aware that hugetlb sysv
> shared memory lives on a different internal kernel mount and so
> has a different block device minor number from the rest of sysv
> shared memory.
I assume this fix is preferred over Badari's? If so, why?
From: Badari Pulavarty <[email protected]>
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 <[email protected]>
Cc: "Albert Cahalan" <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
ipc/shm.c | 5 +++++
1 files changed, 5 insertions(+)
diff -puN ipc/shm.c~restore-shmid-as-inode-to-fix-proc-pid-maps-abi-breakage ipc/shm.c
--- a/ipc/shm.c~restore-shmid-as-inode-to-fix-proc-pid-maps-abi-breakage
+++ a/ipc/shm.c
@@ -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);
_
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
