On Mon, Nov 24, 2014 at 02:03:02PM -0800, Omar Sandoval wrote:
> Alright, I took a look at this. My understanding is that a PREALLOC extent
> represents a region on disk that has already been allocated but isn't in use
> yet, but please correct me if I'm wrong. Judging by this comment in
> btrfs_ge
On 2014/11/25 00:03, Omar Sandoval wrote:
[snip]
The snapshot issue is a little tricker to resolve. I see a few options:
1. Just do the COW and hope for the best
2. As part of btrfs_swap_activate, COW any shared extents. If a snapshot
happens while a swap file is active, we'll fall back to 1.
3
On Sat, Nov 22, 2014 at 12:03:57PM -0800, Omar Sandoval wrote:
> On Fri, Nov 21, 2014 at 07:00:45PM +0100, David Sterba wrote:
> > > + ret = -EINVAL;
> > > + goto out;
> > > + }
> > > + if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
> > > +
On Fri, Nov 21, 2014 at 07:00:45PM +0100, David Sterba wrote:
> > + pr_err("BTRFS: swapfile has holes");
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > + if (em->block_start == EXTENT_MAP_INLINE) {
> > + p
On Fri, Nov 21, 2014 at 6:00 PM, David Sterba wrote:
> On Fri, Nov 21, 2014 at 02:08:31AM -0800, Omar Sandoval wrote:
>> Implement the swap file a_ops on btrfs. Activation simply checks for a usable
>> swap file: it must be fully allocated (no holes), support direct I/O (so no
>> compressed or inl
On Fri, Nov 21, 2014 at 02:08:31AM -0800, Omar Sandoval wrote:
> Implement the swap file a_ops on btrfs. Activation simply checks for a usable
> swap file: it must be fully allocated (no holes), support direct I/O (so no
> compressed or inline extents) and should be nocow (I'm not sure about that
Implement the swap file a_ops on btrfs. Activation simply checks for a usable
swap file: it must be fully allocated (no holes), support direct I/O (so no
compressed or inline extents) and should be nocow (I'm not sure about that last
one).
Signed-off-by: Omar Sandoval
---
fs/btrfs/inode.c | 71 +
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