Andrea Arcangeli wrote:
On Wed, Dec 10, 2008 at 08:08:10PM +0100, Andrea Arcangeli wrote:
On Wed, Dec 10, 2008 at 12:50:17PM -0600, Anthony Liguori wrote:
But opening twice means that you lose coherency with NFS.
Not sure why. They're not running from different nfs clients. If this
I just got confirmation from Trond that from nfs point of view,
opening the file multiple times or duping it, is the same as I
expected (all it matters is that the inode is the same so the
pagecache radix tree is the same etc..). So opening the file each time
a thread starts,
I've been thinking about this, the problems I see are:
1) It's impossible to accept a file descriptor for a block device
(possibly not a problem)
2) You'd have to open all the file descriptors at once. Otherwise, you
get really strange behavior if the file gets deleted while the guest is
running (for instance, with -snapshot).
Regards,
Anthony Liguori
would provide a local f_pos and it would work fine on
older/current kernels too. In theory other nfs clients should also
behave. Not sure what's best, if to hack around the bdrv api and open
the file multiple times or wait for preadv/pwritev.
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