Wire up f2fs to support inline encryption via the helper functions which
fs/crypto/ now provides. This includes:
- Adding a mount option 'inlinecrypt' which enables inline encryption
on encrypted files where it can be used.
- Setting the bio_crypt_ctx on bios that will be submitted to an
inline-encrypted file.
- Not adding logically discontiguous data to bios that will be submitted
to an inline-encrypted file.
- Not doing filesystem-layer crypto on inline-encrypted files.
Co-developed-by: Eric Biggers <ebigg...@google.com>
Signed-off-by: Eric Biggers <ebigg...@google.com>
Signed-off-by: Satya Tangirala <sat...@google.com>
---
fs/f2fs/data.c | 76 +++++++++++++++++++++++++++++++++++++++++++------
fs/f2fs/f2fs.h | 3 ++
fs/f2fs/super.c | 20 +++++++++++++
3 files changed, 91 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5755e897a5f0..b5a7b540e630 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -306,6 +306,35 @@ static struct bio *__bio_alloc(struct f2fs_io_info *fio,
int npages)
return bio;
}
+static int f2fs_set_bio_crypt_ctx(struct bio *bio, const struct inode *inode,
+ pgoff_t first_idx,
+ const struct f2fs_io_info *fio,
+ gfp_t gfp_mask)
+{
+ /*
+ * The f2fs garbage collector sets ->encrypted_page when it wants to
+ * read/write raw data without encryption.
+ */
+ if (fio && fio->encrypted_page)
+ return 0;
+
+ return fscrypt_set_bio_crypt_ctx(bio, inode, first_idx, gfp_mask);
+}
+
+static bool f2fs_crypt_mergeable_bio(struct bio *bio, const struct inode
*inode,
+ pgoff_t next_idx,
+ const struct f2fs_io_info *fio)
+{
+ /*
+ * The f2fs garbage collector sets ->encrypted_page when it wants to
+ * read/write raw data without encryption.
+ */
+ if (fio && fio->encrypted_page)
+ return true;
+
+ return fscrypt_mergeable_bio(bio, inode, next_idx);
+}
+
static inline void __submit_bio(struct f2fs_sb_info *sbi,
struct bio *bio, enum page_type type)
{
@@ -477,6 +506,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
struct bio *bio;
struct page *page = fio->encrypted_page ?
fio->encrypted_page : fio->page;
+ int err;
if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
fio->is_por ? META_POR : (__is_meta_io(fio) ?
@@ -489,6 +519,13 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
/* Allocate a new bio */
bio = __bio_alloc(fio, 1);
+ err = f2fs_set_bio_crypt_ctx(bio, fio->page->mapping->host,
+ fio->page->index, fio, GFP_NOIO);
+ if (err) {
+ bio_put(bio);
+ return err;
+ }
+
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
bio_put(bio);
return -EFAULT;
@@ -556,14 +593,19 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio)
trace_f2fs_submit_page_bio(page, fio);
f2fs_trace_ios(fio, 0);
- if (bio && !page_is_mergeable(fio->sbi, bio, *fio->last_block,
- fio->new_blkaddr)) {
+ if (bio && (!page_is_mergeable(fio->sbi, bio, *fio->last_block,
+ fio->new_blkaddr) ||
+ !f2fs_crypt_mergeable_bio(bio, fio->page->mapping->host,
+ fio->page->index, fio))) {
__submit_bio(fio->sbi, bio, fio->type);
bio = NULL;
}
alloc_new:
if (!bio) {
bio = __bio_alloc(fio, BIO_MAX_PAGES);
+ f2fs_set_bio_crypt_ctx(bio, fio->page->mapping->host,
+ fio->page->index, fio,
+ GFP_NOIO | __GFP_NOFAIL);
bio_set_op_attrs(bio, fio->op, fio->op_flags);
}
@@ -629,8 +671,11 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
inc_page_count(sbi, WB_DATA_TYPE(bio_page));
- if (io->bio && !io_is_mergeable(sbi, io->bio, io, fio,
- io->last_block_in_bio, fio->new_blkaddr))
+ if (io->bio &&
+ (!io_is_mergeable(sbi, io->bio, io, fio, io->last_block_in_bio,
+ fio->new_blkaddr) ||
+ !f2fs_crypt_mergeable_bio(io->bio, fio->page->mapping->host,
+ fio->page->index, fio)))
__submit_merged_bio(io);
alloc_new:
if (io->bio == NULL) {
@@ -642,6 +687,9 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
goto skip;
}
io->bio = __bio_alloc(fio, BIO_MAX_PAGES);
+ f2fs_set_bio_crypt_ctx(io->bio, fio->page->mapping->host,
+ fio->page->index, fio,
+ GFP_NOIO | __GFP_NOFAIL);
io->fio = *fio;
}
@@ -681,15 +729,23 @@ static struct bio *f2fs_grab_read_bio(struct inode
*inode, block_t blkaddr,
struct bio *bio;
struct bio_post_read_ctx *ctx;
unsigned int post_read_steps = 0;
+ int err;
bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false);
if (!bio)
return ERR_PTR(-ENOMEM);
+
+ err = f2fs_set_bio_crypt_ctx(bio, inode, first_idx, NULL, GFP_NOFS);
+ if (err) {
+ bio_put(bio);
+ return ERR_PTR(err);
+ }
+
f2fs_target_device(sbi, blkaddr, bio);
bio->bi_end_io = f2fs_read_end_io;
bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
- if (f2fs_encrypted_file(inode))
+ if (fscrypt_inode_uses_fs_layer_crypto(inode))
post_read_steps |= 1 << STEP_DECRYPT;
if (f2fs_need_verity(inode, first_idx))
@@ -1726,8 +1782,9 @@ static int f2fs_read_single_page(struct inode *inode,
struct page *page,
* This page will go to BIO. Do we need to send this
* BIO off first?
*/
- if (bio && !page_is_mergeable(F2FS_I_SB(inode), bio,
- *last_block_in_bio, block_nr)) {
+ if (bio && (!page_is_mergeable(F2FS_I_SB(inode), bio,
+ *last_block_in_bio, block_nr) ||
+ !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
submit_and_realloc:
__submit_bio(F2FS_I_SB(inode), bio, DATA);
bio = NULL;
@@ -1867,6 +1924,9 @@ static int encrypt_one_page(struct f2fs_io_info *fio)
/* wait for GCed page writeback via META_MAPPING */
f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
+ if (fscrypt_inode_uses_inline_crypto(inode))
+ return 0;
+
retry_encrypt:
fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(fio->page,
PAGE_SIZE, 0,
@@ -2041,7 +2101,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
f2fs_unlock_op(fio->sbi);
err = f2fs_inplace_write_data(fio);
if (err) {
- if (f2fs_encrypted_file(inode))
+ if (fscrypt_inode_uses_fs_layer_crypto(inode))
fscrypt_finalize_bounce_page(&fio->encrypted_page);
if (PageWriteback(page))
end_page_writeback(page);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4024790028aa..e04fda00b4ef 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -137,6 +137,9 @@ struct f2fs_mount_info {
int alloc_mode; /* segment allocation policy */
int fsync_mode; /* fsync policy */
bool test_dummy_encryption; /* test dummy encryption */
+#ifdef CONFIG_FS_ENCRYPTION
+ bool inlinecrypt; /* inline encryption enabled */
+#endif
block_t unusable_cap; /* Amount of space allowed to be
* unusable when disabling checkpoint
*/
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 851ac9522926..850a2a2394d8 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -137,6 +137,7 @@ enum {
Opt_alloc,
Opt_fsync,
Opt_test_dummy_encryption,
+ Opt_inlinecrypt,
Opt_checkpoint_disable,
Opt_checkpoint_disable_cap,
Opt_checkpoint_disable_cap_perc,
@@ -199,6 +200,7 @@ static match_table_t f2fs_tokens = {
{Opt_alloc, "alloc_mode=%s"},
{Opt_fsync, "fsync_mode=%s"},
{Opt_test_dummy_encryption, "test_dummy_encryption"},
+ {Opt_inlinecrypt, "inlinecrypt"},
{Opt_checkpoint_disable, "checkpoint=disable"},
{Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
{Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
@@ -783,6 +785,13 @@ static int parse_options(struct super_block *sb, char
*options)
f2fs_info(sbi, "Test dummy encryption mode enabled");
#else
f2fs_info(sbi, "Test dummy encryption mount option
ignored");
+#endif
+ break;
+ case Opt_inlinecrypt:
+#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
+ F2FS_OPTION(sbi).inlinecrypt = true;
+#else
+ f2fs_info(sbi, "inline encryption not supported");
#endif
break;
case Opt_checkpoint_disable_cap_perc:
@@ -1438,6 +1447,8 @@ static int f2fs_show_options(struct seq_file *seq, struct
dentry *root)
#ifdef CONFIG_FS_ENCRYPTION
if (F2FS_OPTION(sbi).test_dummy_encryption)
seq_puts(seq, ",test_dummy_encryption");
+ if (F2FS_OPTION(sbi).inlinecrypt)
+ seq_puts(seq, ",inlinecrypt");
#endif
if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_DEFAULT)
@@ -1466,6 +1477,9 @@ static void default_options(struct f2fs_sb_info *sbi)
F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
F2FS_OPTION(sbi).test_dummy_encryption = false;
+#ifdef CONFIG_FS_ENCRYPTION
+ F2FS_OPTION(sbi).inlinecrypt = false;
+#endif
F2FS_OPTION(sbi).s_resuid = make_kuid(&init_user_ns, F2FS_DEF_RESUID);
F2FS_OPTION(sbi).s_resgid = make_kgid(&init_user_ns, F2FS_DEF_RESGID);
@@ -2320,6 +2334,11 @@ static void f2fs_get_ino_and_lblk_bits(struct
super_block *sb,
*lblk_bits_ret = 8 * sizeof(block_t);
}
+static bool f2fs_inline_crypt_enabled(struct super_block *sb)
+{
+ return F2FS_OPTION(F2FS_SB(sb)).inlinecrypt;
+}
+
static const struct fscrypt_operations f2fs_cryptops = {
.key_prefix = "f2fs:",
.get_context = f2fs_get_context,
@@ -2329,6 +2348,7 @@ static const struct fscrypt_operations f2fs_cryptops = {
.max_namelen = F2FS_NAME_LEN,
.has_stable_inodes = f2fs_has_stable_inodes,
.get_ino_and_lblk_bits = f2fs_get_ino_and_lblk_bits,
+ .inline_crypt_enabled = f2fs_inline_crypt_enabled,
};
#endif
--
2.24.0.rc0.303.g954a862665-goog
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