[ndctl PATCH] ndctl, create-namespace: prefer the 0th namespace device
by Dan Williams
Depending on initialization order the first seed device in a region may
not point to the first namespace. Always check if the first namespace is
available before falling back to the current seed.
Signed-off-by: Dan Williams <dan.j.williams(a)intel.com>
---
ndctl/builtin-xaction-namespace.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/ndctl/builtin-xaction-namespace.c b/ndctl/builtin-xaction-namespace.c
index 5743eeeb5bfb..46d651e86153 100644
--- a/ndctl/builtin-xaction-namespace.c
+++ b/ndctl/builtin-xaction-namespace.c
@@ -632,6 +632,18 @@ static int validate_namespace_options(struct ndctl_region *region,
return 0;
}
+static struct ndctl_namespace *region_get_namespace(struct ndctl_region *region)
+{
+ struct ndctl_namespace *ndns;
+
+ /* prefer the 0th namespace if it is idle */
+ ndctl_namespace_foreach(region, ndns)
+ if (ndctl_namespace_get_id(ndns) == 0
+ && !is_namespace_active(ndns))
+ return ndns;
+ return ndctl_region_get_namespace_seed(region);
+}
+
static int namespace_create(struct ndctl_region *region)
{
const char *devname = ndctl_region_get_devname(region);
@@ -660,7 +672,7 @@ static int namespace_create(struct ndctl_region *region)
if (p.size == 0)
p.size = available;
- ndns = ndctl_region_get_namespace_seed(region);
+ ndns = region_get_namespace(region);
if (!ndns || is_namespace_active(ndns)) {
debug("%s: no %s namespace seed\n", devname,
ndns ? "idle" : "available");
@@ -794,7 +806,7 @@ static int namespace_reconfig(struct ndctl_region *region,
if (rc)
return rc;
- ndns = ndctl_region_get_namespace_seed(region);
+ ndns = region_get_namespace(region);
if (!ndns || is_namespace_active(ndns)) {
debug("%s: no %s namespace seed\n",
ndctl_region_get_devname(region),
3 years, 8 months
[RFC PATCH 00/17] introduce a dax_inode for dax_operations
by Dan Williams
Recently there was an effort to introduce dax_operations to unwind the
abuse of the user-copy api in the pmem api [1]. Christoph noted that we
should not add new block-dax operations as it is further abuse of struct
block_device [2].
The ->direct_access() method in block_device_operations was an expedient
way to get the filesystem-dax capability bootstrapped. However, looking
forward to native persistent memory filesystems, they can forgo the
block layer and mount directly on a provider of dax services, a dax
inode.
For the time being, since current dax capable filesystems are block
based, we need a facility to look up this dax object via the
block-device name. If this approach looks reasonable I'll follow up with
reworking the proposed ->copy_from_iter(), ->flush(), and ->clear() dax
operations into this new scheme.
These patches survive a run of the libnvdimm unit tests, but I have not
tested the non-libnvdimm dax drivers.
[1]: https://lists.01.org/pipermail/linux-nvdimm/2017-January/008586.html
[2]: https://lists.01.org/pipermail/linux-nvdimm/2017-January/008638.html
---
Dan Williams (17):
dax: refactor dax-fs into a generic provider of dax inodes
dax: convert dax_inode locking to srcu
dax: add a facility to lookup a dax inode by 'host' device name
dax: introduce dax_operations
pmem: add dax_operations support
axon_ram: add dax_operations support
brd: add dax_operations support
dcssblk: add dax_operations support
block: kill bdev_dax_capable()
block: introduce bdev_dax_direct_access()
dm: add dax_operations support (producer)
dm: add dax_operations support (consumer)
fs: update mount_bdev() to lookup dax infrastructure
ext2, ext4, xfs: retrieve dax_inode through iomap operations
Revert "block: use DAX for partition table reads"
fs, dax: convert filesystem-dax to bdev_dax_direct_access
block: remove block_device_operations.direct_access and related infrastructure
arch/powerpc/platforms/Kconfig | 1
arch/powerpc/sysdev/axonram.c | 37 +++
block/Kconfig | 1
block/partition-generic.c | 17 --
drivers/Makefile | 2
drivers/block/Kconfig | 1
drivers/block/brd.c | 48 +++-
drivers/dax/Kconfig | 9 +
drivers/dax/Makefile | 5
drivers/dax/dax.h | 19 +-
drivers/dax/device-dax.h | 25 ++
drivers/dax/device.c | 257 ++++-------------------
drivers/dax/pmem.c | 2
drivers/dax/super.c | 434 +++++++++++++++++++++++++++++++++++++++
drivers/md/Kconfig | 1
drivers/md/dm-core.h | 3
drivers/md/dm-linear.c | 15 +
drivers/md/dm-snap.c | 8 +
drivers/md/dm-stripe.c | 16 +
drivers/md/dm-table.c | 2
drivers/md/dm-target.c | 10 +
drivers/md/dm.c | 43 +++-
drivers/nvdimm/Kconfig | 1
drivers/nvdimm/pmem.c | 46 +++-
drivers/nvdimm/pmem.h | 7 -
drivers/s390/block/Kconfig | 1
drivers/s390/block/dcssblk.c | 41 +++-
fs/block_dev.c | 75 ++-----
fs/dax.c | 149 ++++++-------
fs/ext2/inode.c | 1
fs/ext4/inode.c | 1
fs/iomap.c | 3
fs/super.c | 32 +++
fs/xfs/xfs_aops.c | 13 +
fs/xfs/xfs_aops.h | 1
fs/xfs/xfs_buf.h | 1
fs/xfs/xfs_iomap.c | 1
fs/xfs/xfs_super.c | 3
include/linux/blkdev.h | 7 -
include/linux/dax.h | 29 ++-
include/linux/device-mapper.h | 16 +
include/linux/fs.h | 1
include/linux/iomap.h | 1
tools/testing/nvdimm/Kbuild | 6 -
tools/testing/nvdimm/pmem-dax.c | 12 -
45 files changed, 927 insertions(+), 477 deletions(-)
create mode 100644 drivers/dax/device-dax.h
rename drivers/dax/{dax.c => device.c} (74%)
create mode 100644 drivers/dax/super.c
3 years, 8 months