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authorDan Williams <dan.j.williams@intel.com>2017-06-27 17:59:28 -0700
committerDan Williams <dan.j.williams@intel.com>2017-06-29 09:29:49 -0700
commit9a60c3ef577beb0376704808949f2c1f8fb0672c (patch)
tree380ccc02e12d369daca7ec13d93593e06dd6cf52 /drivers/dax/super.c
parent5d61e43b3975c0582003329d9de9d5e85abf5d33 (diff)
downloadlinux-9a60c3ef577beb0376704808949f2c1f8fb0672c.tar.bz2
dax: convert to bitmask for flags
In preparation for adding more flags, convert the existing flag to a bit-flag. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/super.c')
-rw-r--r--drivers/dax/super.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 9e0160b950d7..8bf71195921b 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -116,13 +116,18 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize)
EXPORT_SYMBOL_GPL(__bdev_dax_supported);
#endif
+enum dax_device_flags {
+ /* !alive + rcu grace period == no new operations / mappings */
+ DAXDEV_ALIVE,
+};
+
/**
* struct dax_device - anchor object for dax services
* @inode: core vfs
* @cdev: optional character interface for "device dax"
* @host: optional name for lookups where the device path is not available
* @private: dax driver private data
- * @alive: !alive + rcu grace period == no new operations / mappings
+ * @flags: state and boolean properties
*/
struct dax_device {
struct hlist_node list;
@@ -130,7 +135,7 @@ struct dax_device {
struct cdev cdev;
const char *host;
void *private;
- bool alive;
+ unsigned long flags;
const struct dax_operations *ops;
};
@@ -197,7 +202,7 @@ EXPORT_SYMBOL_GPL(dax_flush);
bool dax_alive(struct dax_device *dax_dev)
{
lockdep_assert_held(&dax_srcu);
- return dax_dev->alive;
+ return test_bit(DAXDEV_ALIVE, &dax_dev->flags);
}
EXPORT_SYMBOL_GPL(dax_alive);
@@ -217,7 +222,7 @@ void kill_dax(struct dax_device *dax_dev)
if (!dax_dev)
return;
- dax_dev->alive = false;
+ clear_bit(DAXDEV_ALIVE, &dax_dev->flags);
synchronize_srcu(&dax_srcu);
@@ -257,7 +262,7 @@ static void dax_destroy_inode(struct inode *inode)
{
struct dax_device *dax_dev = to_dax_dev(inode);
- WARN_ONCE(dax_dev->alive,
+ WARN_ONCE(test_bit(DAXDEV_ALIVE, &dax_dev->flags),
"kill_dax() must be called before final iput()\n");
call_rcu(&inode->i_rcu, dax_i_callback);
}
@@ -309,7 +314,7 @@ static struct dax_device *dax_dev_get(dev_t devt)
dax_dev = to_dax_dev(inode);
if (inode->i_state & I_NEW) {
- dax_dev->alive = true;
+ set_bit(DAXDEV_ALIVE, &dax_dev->flags);
inode->i_cdev = &dax_dev->cdev;
inode->i_mode = S_IFCHR;
inode->i_flags = S_DAX;