Since extent encryption requires inline encryption, even though we
expect to use the inlinecrypt software fallback most of the time, we
need to enumerate all the devices in use by btrfs.
I'm not sure this is the correct list of active devices and it isn't
tested with any multi-device test yet.
Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@xxxxxxxxxx>
---
fs/btrfs/fscrypt.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/fs/btrfs/fscrypt.c b/fs/btrfs/fscrypt.c
index e03157c367a2..6875108f4363 100644
--- a/fs/btrfs/fscrypt.c
+++ b/fs/btrfs/fscrypt.c
@@ -11,7 +11,9 @@
#include "ioctl.h"
#include "messages.h"
#include "root-tree.h"
+#include "super.h"
#include "transaction.h"
+#include "volumes.h"
#include "xattr.h"
/*
@@ -164,9 +166,46 @@ static bool btrfs_fscrypt_empty_dir(struct inode *inode)
return inode->i_size == BTRFS_EMPTY_DIR_SIZE;
}
+static struct block_device **btrfs_fscrypt_get_devices(struct super_block *sb,
+ unsigned int *num_devs)
+{
+ struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ int nr_devices = fs_devices->open_devices;
+
+ struct block_device **devs;
+ struct btrfs_device *device;
+ int i = 0;
+
+ devs = kmalloc_array(nr_devices, sizeof(*devs), GFP_KERNEL);
+ if (!devs)
+ return ERR_PTR(-ENOMEM);
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
+ if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
+ &device->dev_state) ||
+ !device->bdev ||
+ test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state))
+ continue;
+
+ devs[i++] = device->bdev;
+
+ if (i >= nr_devices)
+ break;
+
+ }
+ rcu_read_unlock();
+
+
+ *num_devs = i;
+ return devs;
+}
+
const struct fscrypt_operations btrfs_fscrypt_ops = {
.get_context = btrfs_fscrypt_get_context,
.set_context = btrfs_fscrypt_set_context,
.empty_dir = btrfs_fscrypt_empty_dir,
+ .get_devices = btrfs_fscrypt_get_devices,
.key_prefix = "btrfs:"
};
--
2.40.1
|