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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-12 19:28:23 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-12 19:28:23 (GMT) |
commit | c239ae1044c341f92b7c20c0783aba71de2d724a (patch) | |
tree | 8085b867525e9d0f31413ffbeb6ded28b2965e25 /drivers/nvdimm/btt_devs.c | |
parent | 86fc04882310dd30bbd768c91dae63363c295598 (diff) | |
parent | d8d378fa1a0c98ecb50ca52c9bf3bc14e25aa2d2 (diff) | |
download | linux-c239ae1044c341f92b7c20c0783aba71de2d724a.tar.xz |
Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fixes from Dan Williams:
- Fix for the nd_blk (NVDIMM Block Window Aperture) driver.
A spec clarification requires the driver to mask off reserved bits in
status register. This is tagged for -stable back to the v4.2 kernel.
- Fix for a kernel crash in the nvdimm unit tests when module loading
is interrupted with SIGTERM. Tagged for -stable since validation
efforts external to Intel use the unit tests for qualifying
backports.
- Add a new 'size' sysfs attribute for the BTT (NVDIMM Block
Translation Table) driver to make it symmetric with the other
namespace personality drivers (PFN and DAX) that provide a size
attribute for indicating how much namespace capacity is lost to
metadata.
The BTT change arrived at the start of the merge window and has
appeared in a -next release. It can technically wait for 4.9, but it
is small, fixes asymmetry in the libnvdimm-sysfs interface, and
something I would have squeezed into the v4.8 pull request had it
arrived a few days earlier.
* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
tools/testing/nvdimm: fix SIGTERM vs hotplug crash
nvdimm, btt: add a size attribute for BTTs
libnvdimm, nd_blk: mask off reserved status bits
Diffstat (limited to 'drivers/nvdimm/btt_devs.c')
-rw-r--r-- | drivers/nvdimm/btt_devs.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index 3fa7919..97dd292 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -140,10 +140,30 @@ static ssize_t namespace_store(struct device *dev, } static DEVICE_ATTR_RW(namespace); +static ssize_t size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + ssize_t rc; + + device_lock(dev); + if (dev->driver) + rc = sprintf(buf, "%llu\n", nd_btt->size); + else { + /* no size to convey if the btt instance is disabled */ + rc = -ENXIO; + } + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(size); + static struct attribute *nd_btt_attributes[] = { &dev_attr_sector_size.attr, &dev_attr_namespace.attr, &dev_attr_uuid.attr, + &dev_attr_size.attr, NULL, }; |