nfs exports & bind mounts

DISCUSSION [email protected] 2 participants 2 messages Nov 10, 2007

Subsystems (2)

NFS client NFS server

lore

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lore

[email protected]

author

2007-11-10 21:36 UTC #0 lore raw

Hi !

i think everybody knows bind mounts.

i can do:

touch /otherpath/dummyfile
mount -bind /path/file /otherpath/dummyfile

so /path/file becomes accessible via /otherpath/dummyfile - dummyfile has the same size as file after successful bind-mount

i can loopback-mount /otherpath/dummyfile to /otherpath/mnt if file/dummyfile contains a filesystem

when i export /otherpath via nfs (crossmnt), from the client side i can access the contents of the filesystem inside file/dummyfile via /otherpath/mnt - but i cannot access the contents of dummyfile itself, i.e. the bind-mount seems to get lost on export.

can someone tell if this is expected behaviour or if this is a bug ?

regards
roland
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Trond Myklebust

2007-11-10 22:26 UTC #1 lore raw

Quoted 9 lines · On Sat, 2007-11-10 at 22:36 +0100, [email protected] wrote:

Hi !
i think everybody knows bind mounts.
i can do:
touch /otherpath/dummyfile
mount -bind /path/file /otherpath/dummyfile

Quoted 7 lines

so /path/file becomes accessible via /otherpath/dummyfile - dummyfile has the same size as file after successful bind-mount
i can loopback-mount /otherpath/dummyfile to /otherpath/mnt if file/dummyfile contains a filesystem
when i export /otherpath via nfs (crossmnt), from the client side i can access the contents of the filesystem inside file/dummyfile via /otherpath/mnt - but i cannot access the contents of dummyfile itself, i.e. the bind-mount seems to get lost on export.
can someone tell if this is expected behaviour or if this is a bug ?

The NFS client will not cross a mount point unless the target is a directory. That is not a bug, it is expected behaviour.

Trond