f2fs crypto: add encryption support in read/write paths
This patch adds encryption support in read and write paths.
Note that, in f2fs, we need to consider cleaning operation.
In cleaning procedure, we must avoid encrypting and decrypting written blocks.
So, this patch implements move_encrypted_block().
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 989c0bf..2c40ce1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -219,6 +219,7 @@
.sbi = sbi,
.type = DATA,
.rw = WRITE_SYNC | REQ_PRIO,
+ .encrypted_page = NULL,
};
/*
@@ -1231,6 +1232,7 @@
.rw = WRITE_SYNC | REQ_META | REQ_PRIO,
.blk_addr = page->index,
.page = page,
+ .encrypted_page = NULL,
};
set_page_writeback(page);
@@ -1330,20 +1332,34 @@
enum page_type btype = PAGE_TYPE_OF_BIO(type);
struct f2fs_bio_info *io = &sbi->write_io[btype];
struct bio_vec *bvec;
+ struct page *target;
int i;
down_read(&io->io_rwsem);
- if (!io->bio)
- goto out;
+ if (!io->bio) {
+ up_read(&io->io_rwsem);
+ return false;
+ }
bio_for_each_segment_all(bvec, io->bio, i) {
- if (page == bvec->bv_page) {
+
+ if (bvec->bv_page->mapping) {
+ target = bvec->bv_page;
+ } else {
+ struct f2fs_crypto_ctx *ctx;
+
+ /* encrypted page */
+ ctx = (struct f2fs_crypto_ctx *)page_private(
+ bvec->bv_page);
+ target = ctx->control_page;
+ }
+
+ if (page == target) {
up_read(&io->io_rwsem);
return true;
}
}
-out:
up_read(&io->io_rwsem);
return false;
}
