Adding fallocate support to device-dax. This implements FALLOC_FL_PUNCH_HOLE
in order to allow clearing of badblocks/poison list.
Signed-off-by: Dave Jiang <dave.ji...@intel.com>
---
drivers/dax/dax-private.h | 1 +
drivers/dax/dax.c | 24 +++++++++++++++-
drivers/dax/dax.h | 4 ++-
drivers/dax/pmem.c | 68 ++++++++++++++++++++++++++++++++++++++++++++-
fs/open.c | 2 +
5 files changed, 95 insertions(+), 4 deletions(-)
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
index a119ef9..aea927d 100644
--- a/drivers/dax/dax-private.h
+++ b/drivers/dax/dax-private.h
@@ -38,6 +38,7 @@ struct dax_dev {
int num_resources;
struct resource res[0];
void *private;
+ const struct file_operations *fops;
};
#endif
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index f1857e6..b5cd73e 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -21,6 +21,7 @@
#include <linux/dax.h>
#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/falloc.h>
#include "dax.h"
#include "dax-private.h"
@@ -314,6 +315,12 @@ void *dax_dev_get_private(struct device *dev)
}
EXPORT_SYMBOL_GPL(dax_dev_get_private);
+struct device *dax_dev_get_device(struct dax_dev *dax_dev)
+{
+ return &dax_dev->dev;
+}
+EXPORT_SYMBOL_GPL(dax_dev_get_device);
+
void dax_dev_set_private(struct dax_dev *dax_dev, void *priv)
{
dax_dev->private = priv;
@@ -606,6 +613,17 @@ static int dax_release(struct inode *inode, struct file
*filp)
return 0;
}
+static long dax_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t len)
+{
+ struct dax_dev *dax_dev = file->private_data;
+
+ if (dax_dev->fops)
+ return dax_dev->fops->fallocate(file, mode, offset, len);
+
+ return -EOPNOTSUPP;
+}
+
static const struct file_operations dax_fops = {
.llseek = noop_llseek,
.owner = THIS_MODULE,
@@ -613,6 +631,7 @@ static const struct file_operations dax_fops = {
.release = dax_release,
.get_unmapped_area = dax_get_unmapped_area,
.mmap = dax_mmap,
+ .fallocate = dax_fallocate,
};
static void dax_dev_release(struct device *dev)
@@ -650,7 +669,8 @@ static void unregister_dax_dev(void *dev)
struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
struct resource *res, int count,
- const struct attribute_group **groups)
+ const struct attribute_group **groups,
+ const struct file_operations *fops)
{
struct device *parent = dax_region->dev;
struct dax_dev *dax_dev;
@@ -730,6 +750,8 @@ struct dax_dev *devm_create_dax_dev(struct dax_region
*dax_region,
if (rc)
return ERR_PTR(rc);
+ dax_dev->fops = fops;
+
return dax_dev;
err_cdev:
diff --git a/drivers/dax/dax.h b/drivers/dax/dax.h
index c23c7ac..6a31a74 100644
--- a/drivers/dax/dax.h
+++ b/drivers/dax/dax.h
@@ -24,8 +24,10 @@ struct dax_region *alloc_dax_region(struct device *parent,
void *addr, unsigned long flags);
struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
struct resource *res, int count,
- const struct attribute_group **groups);
+ const struct attribute_group **groups,
+ const struct file_operations *fops);
void *dax_dev_get_private(struct device *dev);
void dax_dev_set_private(struct dax_dev *dax_dev, void *priv);
+struct device *dax_dev_get_device(struct dax_dev *dax_dev);
#endif /* __DAX_H__ */
diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
index 5ffb2e9..5ab4900 100644
--- a/drivers/dax/pmem.c
+++ b/drivers/dax/pmem.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/pfn_t.h>
#include <linux/badblocks.h>
+#include <linux/falloc.h>
#include "../nvdimm/pfn.h"
#include "../nvdimm/nd.h"
#include "dax.h"
@@ -24,6 +25,69 @@ struct dax_pmem {
struct percpu_ref ref;
struct completion cmp;
struct badblocks bb;
+ resource_size_t start;
+ resource_size_t end;
+};
+
+static void dax_pmem_clear_poison(struct dax_pmem *dax_pmem,
+ loff_t offset, loff_t len)
+{
+ sector_t sector;
+ long cleared;
+
+ sector = offset >> 9;
+ cleared = nvdimm_clear_poison(dax_pmem->dev,
+ dax_pmem->start + offset, len);
+
+ if ((cleared > 0) && (cleared >> 9)) {
+ dev_dbg(dax_pmem->dev, "%s: %#llx clear %ld sector%s\n",
+ __func__, (unsigned long long)sector,
+ cleared >> 9, cleared >> 9 > 1 ? "s" : "");
+ badblocks_clear(&dax_pmem->bb, sector, cleared >> 9);
+ }
+}
+
+static long dax_pmem_fallocate(struct file *file, int mode,
+ loff_t start, loff_t len)
+{
+ struct dax_dev *dax_dev = file->private_data;
+ struct device *dev;
+ struct dax_pmem *dax_pmem;
+ loff_t end = start + len - 1;
+ loff_t res_size;
+
+ dev = dax_dev_get_device(dax_dev);
+ dax_pmem = dax_dev_get_private(dev);
+ res_size = dax_pmem->end - dax_pmem->start + 1;
+
+ dev_dbg(dev, "fallocate mode: %#x, start: %#llx, len: %llu\n",
+ mode, start, len);
+ dev_dbg(dev, "res start: %#llx end: %#llx size: %llu\n",
+ dax_pmem->start, dax_pmem->end, res_size);
+
+ /* check size boundares */
+ if (start >= dax_pmem->end)
+ return -EINVAL;
+ if (end >= res_size) {
+ if (mode & FALLOC_FL_KEEP_SIZE)
+ len = res_size - start;
+ else
+ return -EINVAL;
+ }
+
+ switch (mode) {
+ case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
+ dax_pmem_clear_poison(dax_pmem, start, len);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static const struct file_operations pmem_fops = {
+ .fallocate = dax_pmem_fallocate,
};
static ssize_t dax_pmem_badblocks_show(struct device *dev,
@@ -158,8 +222,10 @@ static int dax_pmem_probe(struct device *dev)
/* TODO: support for subdividing a dax region... */
dax_dev = devm_create_dax_dev(dax_region, &res, 1,
- dax_pmem_attribute_groups);
+ dax_pmem_attribute_groups, &pmem_fops);
dax_dev_set_private(dax_dev, dax_pmem);
+ dax_pmem->start = res.start;
+ dax_pmem->end = res.end;
rc = devm_init_badblocks(dev, &dax_pmem->bb);
if (rc)
diff --git a/fs/open.c b/fs/open.c
index d3ed817..15325fd 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -306,7 +306,7 @@ int vfs_fallocate(struct file *file, int mode, loff_t
offset, loff_t len)
* for directories or not.
*/
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
- !S_ISBLK(inode->i_mode))
+ !S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
return -ENODEV;
/* Check for wrap through zero too */
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