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Subject[RFC PATCH 14/19] btrfs: allow reading compressed encrypted extents
Date
Signed-off-by: Mark Harmstone <mark@harmstone.com>
---
fs/btrfs/compression.c | 22 ++++++++++++++++++++++
fs/btrfs/compression.h | 7 +++++++
2 files changed, 29 insertions(+)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 2955a4ea2fa8..55d7b97a7dc9 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -26,6 +26,7 @@
#include "compression.h"
#include "extent_io.h"
#include "extent_map.h"
+#include "encryption.h"

static const char* const btrfs_compress_types[] = { "", "zlib", "lzo", "zstd" };

@@ -139,6 +140,20 @@ static void end_compressed_bio_read(struct bio *bio)
if (ret)
goto csum_failed;

+ if (cb->key_number != 0) {
+ struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+ unsigned int i;
+
+ for (i = 0; i < cb->nr_pages; i++) {
+ ret = btrfs_decrypt_page(fs_info,
+ cb->compressed_pages[i], cb->key_number,
+ cb->iv);
+
+ if (ret)
+ goto csum_failed;
+ }
+ }
+
/* ok, we're the last bio for this extent, lets start
* the decompression.
*/
@@ -568,6 +583,13 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
em_len = em->len;
em_start = em->start;

+ if (em->encrypt_type == BTRFS_ENCRYPTION_NONE) {
+ cb->key_number = 0;
+ } else {
+ cb->key_number = em->key_number;
+ memcpy(cb->iv, em->iv, BTRFS_ENCRYPTION_BLOCK_LENGTH);
+ }
+
free_extent_map(em);
em = NULL;

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index ddda9b80bf20..86a536d8cd5f 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -7,6 +7,7 @@
#define BTRFS_COMPRESSION_H

#include <linux/sizes.h>
+#include <linux/btrfs_tree.h>

/*
* We want to make sure that amount of RAM required to uncompress an extent is
@@ -54,6 +55,12 @@ struct compressed_bio {
int errors;
int mirror_num;

+ /* encryption key number */
+ u64 key_number;
+
+ /* encryption initialization vector */
+ char iv[BTRFS_ENCRYPTION_BLOCK_LENGTH];
+
/* for reads, this is the bio we are copying the data into */
struct bio *orig_bio;

--
2.19.2
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