Home » Mailing lists » Devel » Re: How to query mount propagation state?
Re: How to query mount propagation state? [message #18234] |
Mon, 16 April 2007 17:39 ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Ram Pai
Messages: 15 Registered: April 2007
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Junior Member |
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On Mon, 2007-04-16 at 12:34 +0200, Miklos Szeredi wrote:
> Currently one of the difficulties with mount propagations is that
> there's no way to know the current state of the propagation tree.
>
> Has anyone thought about how this info could be queried from
> userspace?
I am attaching two patches that I had done way back in Oct 2006
with Al Viro. I had sent these patches to Al Viro. But I forgot to
follow them up, I guess so did Al Viro.
The first patch disambiguates multiple mount-instances of the same
filesystem (or part of the same filesystem), by introducing a new
interface /proc/mounts_new.
The second patch introduces a new proc interface that exposes all the
propagation trees within a namespace. It does not show propagated
mounts residing in a different namespace (for privacy reasons). Maybe
one could modify the patch a little, to allow it; if the user has
root priviledges.
RP
PS: Sorry these are attachments instead of inline patches. I am scared
of inlining in evolution. If needed I can send inline patches through
mutt.
>
> Thanks,
> Miklos
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Re: How to query mount propagation state? [message #18251 is a reply to message #18234] |
Mon, 16 April 2007 19:16 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
serue
Messages: 750 Registered: February 2006
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Senior Member |
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Quoting Ram Pai (linuxram@us.ibm.com):
> On Mon, 2007-04-16 at 12:34 +0200, Miklos Szeredi wrote:
> > Currently one of the difficulties with mount propagations is that
> > there's no way to know the current state of the propagation tree.
> >
> > Has anyone thought about how this info could be queried from
> > userspace?
>
> I am attaching two patches that I had done way back in Oct 2006
> with Al Viro. I had sent these patches to Al Viro. But I forgot to
> follow them up, I guess so did Al Viro.
>
> The first patch disambiguates multiple mount-instances of the same
> filesystem (or part of the same filesystem), by introducing a new
> interface /proc/mounts_new.
>
> The second patch introduces a new proc interface that exposes all the
> propagation trees within a namespace. It does not show propagated
> mounts residing in a different namespace (for privacy reasons). Maybe
> one could modify the patch a little, to allow it; if the user has
> root priviledges.
>
> RP
>
> PS: Sorry these are attachments instead of inline patches. I am scared
> of inlining in evolution. If needed I can send inline patches through
> mutt.
>
> >
> > Thanks,
> > Miklos
> This patch disambiguates multiple mount-instances of the same
> filesystem (or part of the same filesystem), by introducing a new
> interface /proc/mounts_new. The interface has the following format.
>
> ------------------------------------------------------------
> FSID mntpt root-dentry fstype fs-options
> ------------------------------------------------------------
>
> NOTE: root-dentry is the path to the dentry w.r.t to the root dentry of the
> same filesystem.
>
> for example: lets say we attempt the following commands
> mount --bind /var /mnt
> mount --bind /mnt/tmp /tmp1
>
> 'cat /proc/mounts' shows the following:
> /dev/root /mnt ext2 rw 0 0
> /dev/root /tmp1 ext2 rw 0 0
>
> NOTE: The above mount entries, do not indicate that /tmp1 contains the same
> directory tree as /var/tmp.
>
> But 'cat /proc/mounts_new' shows us the following:
> 0x6200 /mnt /var ext2 rw 0 0
> 0x6200 /tmp1 /var/tmp ext2 rw 0 0
>
> The above entries clearly indicates that /var/tmp directory of the ext2
> filesystem with fsid=0x6200 is the directory tree that resides under /tmp1
>
> Signed-off-by: Ram Pai <linuxram@us.ibm.com>
>
> ---
> fs/dcache.c | 53 ++++++++++++++++++++++++++++++++
> fs/namespace.c | 35 ++++++++++++++++++---
> fs/proc/base.c | 32 +++++++++++++++++--
> fs/proc/proc_misc.c | 1
> fs/seq_file.c | 77 ++++++++++++++++++++++++++++++++++-------------
> include/linux/dcache.h | 1
> include/linux/seq_file.h | 1
> 7 files changed, 172 insertions(+), 28 deletions(-)
>
> Index: linux-2.6.17.10/fs/proc/base.c
> ===================================================================
> --- linux-2.6.17.10.orig/fs/proc/base.c
> +++ linux-2.6.17.10/fs/proc/base.c
> @@ -104,6 +104,7 @@ enum pid_directory_inos {
> PROC_TGID_MAPS,
> PROC_TGID_NUMA_MAPS,
> PROC_TGID_MOUNTS,
> + PROC_TGID_MOUNTS_NEW,
> PROC_TGID_MOUNTSTATS,
> PROC_TGID_WCHAN,
> #ifdef CONFIG_MMU
> @@ -145,6 +146,7 @@ enum pid_directory_inos {
> PROC_TID_MAPS,
> PROC_TID_NUMA_MAPS,
> PROC_TID_MOUNTS,
> + PROC_TID_MOUNTS_NEW,
> PROC_TID_MOUNTSTATS,
> PROC_TID_WCHAN,
> #ifdef CONFIG_MMU
> @@ -203,6 +205,7 @@ static struct pid_entry tgid_base_stuff[
> E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
> E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
> E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
> + E(PROC_TGID_MOUNTS_NEW,"mounts_new", S_IFREG|S_IRUGO),
> E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR),
> #ifdef CONFIG_MMU
> E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
> @@ -246,6 +249,7 @@ static struct pid_entry tid_base_stuff[]
> E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
> E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
> E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
> + E(PROC_TID_MOUNTS_NEW, "mounts_new", S_IFREG|S_IRUGO),
> #ifdef CONFIG_MMU
> E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
> #endif
> @@ -692,13 +696,13 @@ static struct file_operations proc_smaps
> };
> #endif
>
> -extern struct seq_operations mounts_op;
> struct proc_mounts {
> struct seq_file m;
> int event;
> };
>
> -static int mounts_open(struct inode *inode, struct file *file)
> +static int __mounts_open(struct inode *inode, struct file *file,
> + struct seq_operations *mounts_op)
> {
> struct task_struct *task = proc_task(inode);
> struct namespace *namespace;
> @@ -716,7 +720,7 @@ static int mounts_open(struct inode *ino
> p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
> if (p) {
> file->private_data = &p->m;
> - ret = seq_open(file, &mounts_op);
> + ret = seq_open(file, mounts_op);
> if (!ret) {
> p->m.private = namespace;
> p->event = namespace->event;
> @@ -729,6 +733,16 @@ static int mounts_open(struct inode *ino
> return ret;
> }
>
> +extern struct seq_operations mounts_op, mounts_new_op;
> +static int mounts_open(struct inode *inode, struct file *file)
> +{
> + return (__mounts_open(inode, file, &mounts_op));
> +}
> +static int mounts_new_open(struct inode *inode, struct file *file)
> +{
> + return __mounts_open(inode, file, &mounts_new_op);
> +}
> +
> static int mounts_release(struct inode *inode, struct file *file)
> {
> struct seq_file *m = file->private_data;
> @@ -763,6 +777,14 @@ static struct file_operations proc_mount
> .poll = mounts_poll,
> };
>
> +static struct file_operations proc_mounts_new_operations = {
> + .open = mounts_new_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = mounts_release,
> + .poll = mounts_poll,
> +};
> +
> extern struct seq_operations mountstats_op;
> static int mountstats_open(struct inode *inode, struct file *file)
> {
> @@ -1799,6 +1821,10 @@ static struct dentry *proc_pident_lookup
> case PROC_TGID_MOUNTS:
> inode->i_fop = &proc_mounts_operations;
> break;
> + case PROC_TID_MOUNTS_NEW:
> + case PROC_TGID_MOUNTS_NEW:
> + inode->i_fop = &proc_mounts_new_operations;
> + break;
> #ifdef CONFIG_MMU
> case PROC_TID_SMAPS:
> case PROC_TGID_SMAPS:
> Index: linux-2.6.17.10/fs/dcache.c
> ===================================================================
> --- linux-2.6.17.10.orig/fs/dcache.c
> +++ linux-2.6.17.10/fs/dcache.c
> @@ -1477,6 +1477,59 @@ char * d_path(struct dentry *dentry, str
> return res;
> }
>
> +static inline int prepend(char **buffer, int *buflen, const char *str,
> + int namelen)
> +{
> + if ((*buflen -= namelen) < 0)
> + return 1;
> + *buffer -= namelen;
> + memcpy(*buffer, str, namelen);
> + return 0;
> +}
> +
> +/*
> + * write full pathname into buffer and return start of pathname.
> + * If @vfsmnt is not specified return the path relative to the
> + * its filesystem's root.
> + */
> +char * dentry_path(struct dentry *dentry, char *buf, int buflen)
> +{
> + char * end = buf+buflen;
> + char * retval;
> +
> + spin_lock(&dcache_lock);
> + prepend(&end, &buflen, "\0", 1);
> + if (!IS_ROOT(dentry) && d_unhashed(dentry)) {
> + if (prepend(&end, &buflen, "//deleted", 10))
> + goto Elong;
> + }
> + /* Get '/' right */
> + retval = end-1;
> + *retval = '/';
> +
> + for (;;) {
> + struct dentry * parent;
> + if (IS_ROOT(dentry))
> + break;
> +
> + parent = dentry->d_parent;
> + prefetch(parent);
> +
> + if (prepend(&end, &buflen, dentry->d_name.name,
> + dentry->d_name.len) ||
> + prepend(&end, &buflen, "/", 1))
> + goto Elong;
> +
> + retval = end;
> + dentry = parent;
> + }
> + spin_unlock(&dcache_lock);
> + return retval;
> +Elong:
> + spin_unlock(&dcache_lock);
> + return ERR_PTR(-ENAMETOOLONG);
> +}
> +
> /*
> * NOTE! The user-level library version returns a
> * character pointer. The kernel system call just
> Index: linux-2.6.17.10/fs/seq_file.c
> ===================================================================
> --- linux-2.6.17.10.orig/fs/seq_file.c
> +++ linux-2.6.17.10/fs/seq_file.c
> @@ -338,38 +338,75 @@ int seq_printf(struct seq_file *m, const
> }
> EXPORT_SYMBOL(seq_printf);
>
> -int seq_path(struct seq_file *m,
> - struct vfsmount *mnt, struct dentry *dentry,
> +static inline char *mangle_path(char *s, char *p, char *esc)
> +{
> + while (s <= p) {
> + char c = *p++;
> + if (!c) {
> + return s;
> + } else if (!strchr(esc, c)) {
> + *s++ = c;
> + } else if (s + 4 > p) {
> + break;
> + } else {
> + *s++ = '\\';
> + *s++ = '0' + ((c & 0300) >> 6);
> + *s++ = '0' + ((c & 070) >> 3);
> + *s++ = '0' + (c & 07);
> + }
> + }
> + return NULL;
> +}
> +
> +/*
> + * return the absolute path of 'dentry' residing in mount 'mnt'.
> + */
> +int seq_path(struct seq_file *m, struct vfsmount *mnt, struct dentry
...
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Re: How to query mount propagation state? [message #18256 is a reply to message #18234] |
Mon, 16 April 2007 21:07 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Karel Zak
Messages: 7 Registered: April 2007
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Junior Member |
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On Mon, Apr 16, 2007 at 10:39:46AM -0700, Ram Pai wrote:
> This patch disambiguates multiple mount-instances of the same
> filesystem (or part of the same filesystem), by introducing a new
> interface /proc/mounts_new. The interface has the following format.
^^^^^^^^^^^^^^
... odd name. What will be the name for a next generation?
"/proc/mounts_new_new"? :-)
> 'cat /proc/mounts' shows the following:
> /dev/root /mnt ext2 rw 0 0
> /dev/root /tmp1 ext2 rw 0 0
>
> NOTE: The above mount entries, do not indicate that /tmp1 contains the same
> directory tree as /var/tmp.
>
> But 'cat /proc/mounts_new' shows us the following:
> 0x6200 /mnt /var ext2 rw 0 0
> 0x6200 /tmp1 /var/tmp ext2 rw 0 0
Can't you purely and simply add the fsid= option to /proc/mounts?
/dev/root /mnt ext2 rw,fsid=0x6200 0 0
/dev/root /mnt ext2 rw,fsid=0x6200 0 0
I think you can do it without a negative impact to userspace.
> This patch introduces a new proc interface that exposes all the propagation
> trees within the namespace.
Good idea.
> It walks through each off the mounts in the namespace, and prints the following information.
>
> mount-id: a unique mount identifier
> dev-id : the unique device used to identify the device containing the filesystem
^^^^
Why not major:minor?
> path-from-root: mount point of the mount from /
> path-from-root-of-its-sb: path from its own root dentry.
> propagation-flag: SHARED, SLAVE, UNBINDABLE, PRIVATE
> peer-mount-id: the mount-id of its peer mount (if this mount is shared)
> master-mount-id: the mount-id of its master mount (if this mount is slave)
> Example:
> Here is a sample output of cat /proc/$$/mounts_propagation
>
> 0xa917800 0x1 / / PRIVATE
> 0xa917200 0x6200 / / PRIVATE
> 0xa917180 0x3 /proc / PRIVATE
> 0xa917f80 0xa /dev/pts / PRIVATE
> 0xa917100 0x6210 /mnt / SHARED peer:0xa917100
> 0xa917f00 0x6210 /tmp /1 SLAVE master:0xa917100
> 0xa917900 0x6220 /mnt/2 / SHARED peer:0xa917900
Same thing (although the mounts_propagation makes more sense than
mount_new from my point of view).
cat /proc/mounts (or /proc/$$/mounts)
/dev/root /mnt ext2 rw,mid=0xa917100,did=0x6210,prop=SHARED,peer=0xa917100
my $0.02...
Karel
--
Karel Zak <kzak@redhat.com>
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Re: How to query mount propagation state? [message #18257 is a reply to message #18251] |
Tue, 17 April 2007 06:55 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Ram Pai
Messages: 15 Registered: April 2007
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Junior Member |
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On Mon, 2007-04-16 at 14:16 -0500, Serge E. Hallyn wrote:
> > This patch introduces a new proc interface that exposes all the
> propagation
> > trees within the namespace.
> >
> > It walks through each off the mounts in the namespace, and prints
> the following information.
> >
> > mount-id: a unique mount identifier
> > dev-id : the unique device used to identify the device containing
> the filesystem
> > path-from-root: mount point of the mount from /
> > path-from-root-of-its-sb: path from its own root dentry.
> > propagation-flag: SHARED, SLAVE, UNBINDABLE, PRIVATE
> > peer-mount-id: the mount-id of its peer mount (if this mount is
> shared)
> > master-mount-id: the mount-id of its master mount (if this mount is
> slave)
> >
> > Using the above information one could easily write a script that can
> > draw all the propagation trees in the namespace.
> >
> >
> > Example:
> > Here is a sample output of cat /proc/$$/mounts_propagation
> >
> > 0xa917800 0x1 / / PRIVATE
> > 0xa917200 0x6200 / / PRIVATE
> > 0xa917180 0x3 /proc / PRIVATE
> > 0xa917f80 0xa /dev/pts / PRIVATE
> > 0xa917100 0x6210 /mnt / SHARED peer:0xa917100
> > 0xa917f00 0x6210 /tmp /1 SLAVE master:0xa917100
> > 0xa917900 0x6220 /mnt/2 / SHARED peer:0xa917900
> >
> > line 5 indicates that the mount with id 0xa917100 is mounted at /mnt
> is shared
> > and it is the only mount in its peer group.
> >
> > line 6 indicates that the mount with id 0xa917f00 is mounted
> at /tmp, its
> > root is the dentry 1 present under its root directory. This mount is
> a
> > slave mount and its master is the mount with id 0xa917100.
> >
> > line 7 indicates that the mount with id 0xa917900 is mounted
> at /mnt/2, its
> > root is the dentry / of its filesystem. This mount is a
> > shared and it is the only mount in its peer group.
> >
> > one could write a script which runs through these lines and draws 4
> > individual satellite mounts and two propagation trees, the first
> propagation
> > tree has a shared mount and a slave mount. and the second
> propagation tree has
> > just one shared mount.
> >
> >
> > Signed-off-by: Ram Pai <linuxram@us.ibm.com>
> > ---
> > fs/namespace.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> > fs/pnode.c | 6 ------
> > fs/pnode.h | 6 ++++++
> > fs/proc/base.c | 22 +++++++++++++++++++++-
> > 4 files changed, 69 insertions(+), 7 deletions(-)
> >
> > Index: linux-2.6.17.10/fs/namespace.c
> > ===================================================================
> > --- linux-2.6.17.10.orig/fs/namespace.c
> > +++ linux-2.6.17.10/fs/namespace.c
> > @@ -410,6 +410,41 @@ static int show_vfsmnt_new(struct seq_fi
> > return show_options(m, v);
> > }
> >
> > +static int show_vfsmnt_propagation(struct seq_file *m, void *v)
> > +{
> > + struct vfsmount *mnt = v;
> > + seq_printf(m, "0x%x", (int)mnt);
> > + seq_putc(m, ' ');
> > + seq_printf(m, "0x%x", new_encode_dev(mnt->mnt_sb->s_dev));
> > + seq_putc(m, ' ');
> > + seq_path(m, mnt, mnt->mnt_root, " \t\n\\");
> > + seq_putc(m, ' ');
> > + seq_dentry(m, mnt->mnt_root, " \t\n\\");
> > + seq_putc(m, ' ');
> > +
> > + if (IS_MNT_SHARED(mnt)) {
> > + seq_printf(m, "%s ", "SHARED");
> > + if (IS_MNT_SLAVE(mnt)) {
> > + seq_printf(m, "%s ", "SLAVE");
> > + }
> > + } else if (IS_MNT_SLAVE(mnt)) {
> > + seq_printf(m, "%s ", "SLAVE");
> > + } else if (IS_MNT_UNBINDABLE(mnt)) {
> > + seq_printf(m, "%s ", "UNBINDABLE");
> > + } else {
> > + seq_printf(m, "%s ", "PRIVATE");
> > + }
> > +
> > + if (IS_MNT_SHARED(mnt)) {
> > + seq_printf(m, "peer:0x%x ", (int)next_peer(mnt));
>
> Ok, so if the sequence of events was
>
> mount --make-shared /mnt
> (some user logs in and gets a cloned namespace, so his /mnt
> becomes the next peer of /mnt)
> mount --bind /mnt /tmp
> (some other user logs in and gets cloned namespace...)
>
> or some such sequence of events, we could lose all information
> about /mnt and /tmp being peers, right? Should a new
> next_peer_in_same_namespace(mnt) be used rather than next_peer()?
you are right. it should print next_peer(mnt) only if CAP_SYS_ADMIN,
else print next_peer_in_same_namespace(mnt).
>
> Somewhat similarly,
>
> > + }
> > + if (IS_MNT_SLAVE(mnt)) {
> > + seq_printf(m, "master:0x%x ", (int)mnt->mnt_master);
>
> Should we for privacy reasons not print out the address
> mnt->mnt_master
> is in a different namespace (perhaps if !CAP_SYS_ADMIN)?
right. it should print mnt->mnt_master if (CAP_SYS_ADMIN), otherwise
print master_in_same_namespace(mnt).
RP
>
> Otherwise I like this.
>
> thanks,
> -serge
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Re: How to query mount propagation state? [message #18258 is a reply to message #18256] |
Tue, 17 April 2007 07:38 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) |
Ram Pai
Messages: 15 Registered: April 2007
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Junior Member |
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On Mon, 2007-04-16 at 23:07 +0200, Karel Zak wrote:
> On Mon, Apr 16, 2007 at 10:39:46AM -0700, Ram Pai wrote:
>
> > This patch disambiguates multiple mount-instances of the same
> > filesystem (or part of the same filesystem), by introducing a new
> > interface /proc/mounts_new. The interface has the following format.
> ^^^^^^^^^^^^^^
> ... odd name. What will be the name for a next generation?
> "/proc/mounts_new_new"? :-)
>
that was the name I came up with 6 months back :-). Yes It should be
something more appropriate. Maybe /proc/mounts_1 ? The next generation
one would be /proc/mounts_2 ? Suggestion?
> > 'cat /proc/mounts' shows the following:
> > /dev/root /mnt ext2 rw 0 0
> > /dev/root /tmp1 ext2 rw 0 0
> >
> > NOTE: The above mount entries, do not indicate that /tmp1 contains the same
> > directory tree as /var/tmp.
> >
> > But 'cat /proc/mounts_new' shows us the following:
> > 0x6200 /mnt /var ext2 rw 0 0
> > 0x6200 /tmp1 /var/tmp ext2 rw 0 0
>
> Can't you purely and simply add the fsid= option to /proc/mounts?
>
> /dev/root /mnt ext2 rw,fsid=0x6200 0 0
> /dev/root /mnt ext2 rw,fsid=0x6200 0 0
>
> I think you can do it without a negative impact to userspace.
ok.
>
> > This patch introduces a new proc interface that exposes all the propagation
> > trees within the namespace.
>
> Good idea.
>
> > It walks through each off the mounts in the namespace, and prints the following information.
> >
> > mount-id: a unique mount identifier
> > dev-id : the unique device used to identify the device containing the filesystem
> ^^^^
> Why not major:minor?
Thinking about it, I feel we dont need this field at all. Basically we
need a field that can be keyed-upon to find the corresponding record
in /proc/mounts_1. mount-id can be used as the matching field, provided
we add the mount-id field to /proc/mounts_1.
agree?
RP
> > path-from-root: mount point of the mount from /
> > path-from-root-of-its-sb: path from its own root dentry.
> > propagation-flag: SHARED, SLAVE, UNBINDABLE, PRIVATE
> > peer-mount-id: the mount-id of its peer mount (if this mount is shared)
> > master-mount-id: the mount-id of its master mount (if this mount is slave)
>
> > Example:
> > Here is a sample output of cat /proc/$$/mounts_propagation
> >
> > 0xa917800 0x1 / / PRIVATE
> > 0xa917200 0x6200 / / PRIVATE
> > 0xa917180 0x3 /proc / PRIVATE
> > 0xa917f80 0xa /dev/pts / PRIVATE
> > 0xa917100 0x6210 /mnt / SHARED peer:0xa917100
> > 0xa917f00 0x6210 /tmp /1 SLAVE master:0xa917100
> > 0xa917900 0x6220 /mnt/2 / SHARED peer:0xa917900
>
> Same thing (although the mounts_propagation makes more sense than
> mount_new from my point of view).
>
> cat /proc/mounts (or /proc/$$/mounts)
>
> /dev/root /mnt ext2 rw,mid=0xa917100,did=0x6210,prop=SHARED,peer=0xa917100
>
>
> my $0.02...
>
> Karel
>
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