BMC/Intel-BMC/linux.git/drivers/block/xen-blkback/blkback.c, branch dev

Merge branch 'stable/for-jens-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus

2015-07-27T17:58:41+00:00

Konrad writes: "There are three bugs that have been found in the xen-blkfront (and backend). Two of them have the stable tree CC-ed. They have been found where an guest is migrating to a host that is missing 'feature-persistent' support (from one that has it enabled). We end up hitting an BUG() in the driver code."

xen-blkback: replace work_pending with work_busy in purge_persistent_gnt()

2015-07-24T13:09:49+00:00

The BUG_ON() in purge_persistent_gnt() will be triggered when previous purge work haven't finished. There is a work_pending() before this BUG_ON, but it doesn't account if the work is still currently running. CC: stable@vger.kernel.org Acked-by: Roger Pau Monné Signed-off-by: Bob Liu Signed-off-by: Konrad Rzeszutek Wilk

Merge tag 'for-linus-4.2-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2015-07-01T18:53:46+00:00

Pull xen updates from David Vrabel: "Xen features and cleanups for 4.2-rc0: - add "make xenconfig" to assist in generating configs for Xen guests - preparatory cleanups necessary for supporting 64 KiB pages in ARM guests - automatically use hvc0 as the default console in ARM guests" * tag 'for-linus-4.2-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: block/xen-blkback: s/nr_pages/nr_segs/ block/xen-blkfront: Remove invalid comment block/xen-blkfront: Remove unused macro MAXIMUM_OUTSTANDING_BLOCK_REQS arm/xen: Drop duplicate define mfn_to_virt xen/grant-table: Remove unused macro SPP xen/xenbus: client: Fix call of virt_to_mfn in xenbus_grant_ring xen: Include xen/page.h rather than asm/xen/page.h kconfig: add xenconfig defconfig helper kconfig: clarify kvmconfig is for kvm xen/pcifront: Remove usage of struct timeval xen/tmem: use BUILD_BUG_ON() in favor of BUG_ON() hvc_xen: avoid uninitialized variable warning xenbus: avoid uninitialized variable warning xen/arm: allow console=hvc0 to be omitted for guests arm,arm64/xen: move Xen initialization earlier arm/xen: Correctly check if the event channel interrupt is present

Merge branch 'stable/for-jens-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus

2015-06-27T17:47:07+00:00

block/xen-blkback: s/nr_pages/nr_segs/

2015-06-17T15:35:19+00:00

Make the code less confusing to read now that Linux may not have the same page size as Xen. Signed-off-by: Julien Grall Acked-by: Roger Pau Monné Cc: Konrad Rzeszutek Wilk Signed-off-by: David Vrabel

xen/block: add multi-page ring support

2015-06-06T01:14:05+00:00

Extend xen/block to support multi-page ring, so that more requests can be issued by using more than one pages as the request ring between blkfront and backend. As a result, the performance can get improved significantly. We got some impressive improvements on our highend iscsi storage cluster backend. If using 64 pages as the ring, the IOPS increased about 15 times for the throughput testing and above doubled for the latency testing. The reason was the limit on outstanding requests is 32 if use only one-page ring, but in our case the iscsi lun was spread across about 100 physical drives, 32 was really not enough to keep them busy. Changes in v2: - Rebased to 4.0-rc6. - Document on how multi-page ring feature working to linux io/blkif.h. Changes in v3: - Remove changes to linux io/blkif.h and follow the protocol defined in io/blkif.h of XEN tree. - Rebased to 4.1-rc3 Changes in v4: - Turn to use 'ring-page-order' and 'max-ring-page-order'. - A few comments from Roger. Changes in v5: - Clarify with 4k granularity to comment - Address more comments from Roger Signed-off-by: Bob Liu Signed-off-by: Konrad Rzeszutek Wilk

xen/grant: introduce func gnttab_unmap_refs_sync()

2015-04-27T10:41:12+00:00

There are several place using gnttab async unmap and wait for completion, so move the common code to a function gnttab_unmap_refs_sync(). Signed-off-by: Bob Liu Acked-by: Roger Pau Monné Acked-by: Konrad Rzeszutek Wilk Signed-off-by: David Vrabel

xen/blkback: safely unmap purge persistent grants

2015-04-27T10:40:10+00:00

Commit c43cf3ea8385 ("xen-blkback: safely unmap grants in case they are still in use") use gnttab_unmap_refs_async() to wait until the mapped pages are no longer in use before unmapping them, but that commit missed the persistent case. Purge persistent pages can't be unmapped either unless no longer in use. Signed-off-by: Bob Liu Acked-by: Roger Pau Monné Signed-off-by: David Vrabel

xen-blkback: define pr_fmt macro to avoid the duplication of DRV_PFX

2015-04-07T14:32:43+00:00

Define pr_fmt macro with {xen-blkback: } prefix, then remove all use of DRV_PFX in the pr sentences. Replace all DPRINTK with pr sentences, and get rid of DPRINTK macro. It will simplify the code. And if the pr sentences miss a \n, add it in the end. If the DPRINTK sentences have redundant \n, remove it. It will format the code. These all make the readability of the code become better. Signed-off-by: Tao Chen Signed-off-by: Konrad Rzeszutek Wilk Acked-by: Roger Pau Monné

xen-blkback: safely unmap grants in case they are still in use

2015-01-28T14:03:16+00:00

Use gnttab_unmap_refs_async() to wait until the mapped pages are no longer in use before unmapping them. This allows blkback to use network storage which may retain refs to pages in queued skbs after the block I/O has completed. Signed-off-by: Jennifer Herbert Acked-by: Roger Pau Monné Acked-by: Jens Axboe Signed-off-by: David Vrabel