From: Hou Tao
__hash_remove() removes hash_cell with _hash_lock locked, so acquiring
_hash_lock can guarantee no-NULL hc returned from dm_get_mdptr() must
have not been removed and hc->md must still be md.
__hash_remove() also acquires dm_hash_cells_mutex before setting mdptr
as NULL, so in dm_c
On Fri, Sep 23, 2022 at 8:15 AM Mike Snitzer wrote:
>
> On Thu, Sep 15 2022 at 12:48P -0400,
> Sarthak Kukreti wrote:
>
> > From: Sarthak Kukreti
> >
> > Introduce block request REQ_OP_PROVISION. The intent of this request
> > is to request underlying storage to preallocate disk space for the gi
Once ext4 is done mapping blocks for an fallocate() request, send
out an FALLOC_FL_PROVISION request to the underlying layer to
ensure that the space is provisioned for the newly allocated extent
or indirect blocks.
There is an expected performance degradation with fallocate() calls made
with this
Introduce block request REQ_OP_PROVISION. The intent of this request
is to request underlying storage to preallocate disk space for the given
block range. Block device that support this capability will export
a provision limit within their request queues.
Signed-off-by: Sarthak Kukreti
---
block
On Thu, Sep 22, 2022 at 11:29 AM Brian Foster wrote:
>
> On Thu, Sep 22, 2022 at 01:04:33AM -0700, Sarthak Kukreti wrote:
> > On Wed, Sep 21, 2022 at 8:39 AM Brian Foster wrote:
> > >
> > > On Fri, Sep 16, 2022 at 02:02:31PM -0700, Sarthak Kukreti wrote:
> > > > On Fri, Sep 16, 2022 at 4:56 AM Br
On Fri, Sep 23, 2022 at 7:08 AM Mike Snitzer wrote:
>
> On Fri, Sep 23 2022 at 4:51P -0400,
> Christoph Hellwig wrote:
>
> > On Wed, Sep 21, 2022 at 07:48:50AM +1000, Daniil Lunev wrote:
> > > > There is no such thing as WRITE UNAVAILABLE in NVMe.
> > > Apologize, that is WRITE UNCORRECTABLE. Ch
On Fri, Sep 23, 2022 at 7:23 AM Mike Snitzer wrote:
>
> On Thu, Sep 15 2022 at 12:48P -0400,
> Sarthak Kukreti wrote:
>
> > From: Sarthak Kukreti
> >
> > Add support to dm devices for REQ_OP_PROVISION. The default mode
> > is to pass through the request and dm-thin will utilize it to provision
>
Add support for provision requests to loopback devices.
Loop devices will configure provision support based on
whether the underlying block device/file can support
the provision request and upon receiving a provision bio,
will map it to the backing device/storage.
Signed-off-by: Sarthak Kukreti
-
Add a mount option that sets the default provisioning mode for
all files within the filesystem.
Signed-off-by: Sarthak Kukreti
---
fs/ext4/ext4.h| 1 +
fs/ext4/extents.c | 7 +++
fs/ext4/super.c | 7 +++
3 files changed, 15 insertions(+)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.
Hi Michael,
Sorry, I had no time to create a new version.
I'll do it today.
Alvaro
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FALLOC_FL_PROVISION is a new fallocate() allocation mode that
sends a hint to (supported) thinly provisioned block devices to
allocate space for the given range of sectors via REQ_OP_PROVISION.
The man pages for both fallocate(2) and posix_fallocate(3) describe
the default allocation mode as:
```
Adds a per-file provision override that allows select files to
override the per-mount setting for provisioning blocks on allocation.
This acts as a mechanism to allow mounts using provision to
replicate the current behavior for fallocate() and only preserve
space at the filesystem level.
Signed-o
On Fri, Sep 23, 2022 at 1:45 AM Christoph Hellwig wrote:
>
> On Tue, Sep 20, 2022 at 10:54:32PM -0700, Sarthak Kukreti wrote:
> > [ mmc0blkp1 | ext4(1) | sparse file | loop | dm-thinp | dm-thin | ext4(2) ]
> >
> > would be predicated on the guarantees of fallocate() per allocation
> > layer; if ex
Hi,
This patch series adds a mechanism to pass through provision requests on
stacked thinly provisioned storage devices/filesystems.
The linux kernel provides several mechanisms to set up thinly provisioned
block storage abstractions (eg. dm-thin, loop devices over sparse files),
either directly
Add support to dm devices for REQ_OP_PROVISION. The default mode
is to pass through the request and dm-thin will utilize it to provision
blocks.
Signed-off-by: Sarthak Kukreti
---
drivers/md/dm-crypt.c | 4 +-
drivers/md/dm-linear.c| 1 +
drivers/md/dm-snap.c | 7 +++
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