[PATCH ndctl v2 02/10] libdaxctl: add daxctl_dev_set_size()

Add an API for setting the size of a dax device. This sysfs attribute is only writeable for a dynamic dax device such as the one exported by hmem. Signed-off-by: Joao Martins <joao.m.martins(a)oracle.com&gt; Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt; --- daxctl/lib/libdaxctl.c | 24 ++++++++++++++++++++++++ daxctl/lib/libdaxctl.sym | 5 +++++ daxctl/libdaxctl.h | 1 + 3 files changed, 30 insertions(+) diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c index ee4a069eb463..00d5f7fe61ad 100644 --- a/daxctl/lib/libdaxctl.c +++ b/daxctl/lib/libdaxctl.c @@ -1019,6 +1019,30 @@ DAXCTL_EXPORT unsigned long long daxctl_dev_get_size(struct daxctl_dev *dev) return dev->size; } +DAXCTL_EXPORT int daxctl_dev_set_size(struct daxctl_dev *dev, unsigned long long size) +{ + struct daxctl_ctx *ctx = daxctl_dev_get_ctx(dev); + char buf[SYSFS_ATTR_SIZE]; + char *path = dev->dev_buf; + int len = dev->buf_len; + + if (snprintf(path, len, "%s/size", dev->dev_path) >= len) { + err(ctx, "%s: buffer too small!\n", + daxctl_dev_get_devname(dev)); + return -ENXIO; + } + + sprintf(buf, "%#llx\n", size); + if (sysfs_write_attr(ctx, path, buf) < 0) { + err(ctx, "%s: failed to set size\n", + daxctl_dev_get_devname(dev)); + return -ENXIO; + } + + dev->size = size; + return 0; +} + DAXCTL_EXPORT int daxctl_dev_get_target_node(struct daxctl_dev *dev) { return dev->target_node; diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym index 87d02366a917..d8b4137c76b7 100644 --- a/daxctl/lib/libdaxctl.sym +++ b/daxctl/lib/libdaxctl.sym @@ -75,3 +75,8 @@ global: daxctl_memory_is_movable; daxctl_memory_online_no_movable; } LIBDAXCTL_6; + +LIBDAXCTL_8 { +global: + daxctl_dev_set_size; +} LIBDAXCTL_7; diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h index 6c545e1f3055..e3d482743cc6 100644 --- a/daxctl/libdaxctl.h +++ b/daxctl/libdaxctl.h @@ -68,6 +68,7 @@ int daxctl_dev_get_major(struct daxctl_dev *dev); int daxctl_dev_get_minor(struct daxctl_dev *dev); unsigned long long daxctl_dev_get_resource(struct daxctl_dev *dev); unsigned long long daxctl_dev_get_size(struct daxctl_dev *dev); +int daxctl_dev_set_size(struct daxctl_dev *dev, unsigned long long size); struct daxctl_ctx *daxctl_dev_get_ctx(struct daxctl_dev *dev); int daxctl_dev_is_enabled(struct daxctl_dev *dev); int daxctl_dev_disable(struct daxctl_dev *dev); -- 1.8.3.1