zfs code - Jan 2010 - Obtaining zpool volume size from a C coded application.

As I was navigating through the source code for the ZFS file system I saw that
in zvol.c where the ioctls are defined, if a program sends a DKIOCGGEOM or
DKIOCDVTOV, an ENOTSUP (Error Not Supported) is returned.

You can view this here:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/zvol.c

My question is, what is an appropriate method to obtain the zpool''s
volume size from a C coded application?
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As I was navigating through the source code for the ZFS file system I saw that
in zvol.c where the ioctls are defined, if a program sends a DKIOCGGEOM or
DKIOCDVTOV, an ENOTSUP (Error Not Supported) is returned.

You can view this here:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/zvol.c

My question is, what is an appropriate method to obtain the zpool''s
volume size from a C coded application?
-- 
This message posted from opensolaris.org

[cross posting is probably better than muli-posts]

Petros Koutoupis wrote:
> As I was navigating through the source code for the ZFS file system I saw
that in zvol.c where the ioctls are defined, if a program sends a DKIOCGGEOM or
DKIOCDVTOV, an ENOTSUP (Error Not Supported) is returned.
>
> You can view this here:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/zvol.c
>
> My question is, what is an appropriate method to obtain the
zpool''s volume size from a C coded application?
>   
I use zprop_get_list and zfs_prop_get form libzfs to read and parse zfs 
properties.  There may be a more direct way, but zprop_get_list appears 
to be the generic solution.

-- 
Ian.

Ian,

Thank you very much for your response. On Friday, as I was writing my post, I
was navigating through the zpool user land binary''s source code and had
observed that method. I was just hoping that there was some other and simpler
way. I guess not. Unless the time was taken to patch ZFS with an additional
supported ioctl() to return a total accessible "block" count of the
zpool. That is the beauty of open source.

Again, thank you very much for your reply. You have been very helpful.
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You can use the DKIOCGMEDIAINFO ioctl to get this information.

-  Eric
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This message posted from opensolaris.org

You can use the DKIOCGMEDIAINFO ioctl to get this information.

-  Eric
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