Merge remote-tracking branch 'aosp/upstream-f2fs-stable-linux-5.15.y' into android14-5.15

* aosp/upstream-f2fs-stable-linux-5.15.y:
  f2fs: let's avoid panic if extent_tree is not created
  f2fs: should use a temp extent_info for lookup
  f2fs: don't mix to use union values in extent_info
  f2fs: initialize extent_cache parameter
  f2fs: fix to avoid NULL pointer dereference in f2fs_issue_flush()
  fs: account for group membership
  fs: fix acl translation
  fs: support mapped mounts of mapped filesystems
  fs: add i_user_ns() helper
  fs: port higher-level mapping helpers
  fs: remove unused low-level mapping helpers
  fs: use low-level mapping helpers
  docs: update mapping documentation
  fs: account for filesystem mappings
  fs: tweak fsuidgid_has_mapping()
  fs: move mapping helpers
  fs: add is_idmapped_mnt() helper
  Revert "fs: add is_idmapped_mnt() helper"
  Revert "fs: move mapping helpers"
  Revert "fs: tweak fsuidgid_has_mapping()"
  Revert "fs: account for filesystem mappings"
  Revert "docs: update mapping documentation"
  Revert "fs: use low-level mapping helpers"
  Revert "fs: remove unused low-level mapping helpers"
  Revert "fs: add i_user_ns() helper"
  Revert "fs: account for group membership"
  fsverity: simplify fsverity_get_digest()
  fsverity: stop using PG_error to track error status
  fs-verity: use kmap_local_page() instead of kmap()
  highmem: Make __kunmap_{local,atomic}() take const void pointer
  fs-verity: use memcpy_from_page()
  fs-verity: Use struct_size() helper in enable_verity()
  fs-verity: remove unused parameter desc_size in fsverity_create_info()
  fs-verity: define a function to return the integrity protected file digest
  fscrypt: add additional documentation for SM4 support
  fscrypt: remove unused Speck definitions
  fscrypt: Add SM4 XTS/CTS symmetric algorithm support
  blk-crypto: Add support for SM4-XTS blk crypto mode
  fscrypt: add comment for fscrypt_valid_enc_modes_v1()
  blk-crypto: Add a missing include directive
  blk-crypto: move internal only declarations to blk-crypto-internal.h
  blk-crypto: add a blk_crypto_config_supported_natively helper
  blk-crypto: don't use struct request_queue for public interfaces
  fscrypt: pass super_block to fscrypt_put_master_key_activeref()
  fscrypt: add fscrypt_context_for_new_inode
  fscrypt: export fscrypt_fname_encrypt and fscrypt_fname_encrypted_size
  fscrypt: Add HCTR2 support for filename encryption
  fs: account for group membership
  fs: add i_user_ns() helper
  fs: remove unused low-level mapping helpers
  fs: use low-level mapping helpers
  docs: update mapping documentation
  fs: account for filesystem mappings
  fs: tweak fsuidgid_has_mapping()
  fs: move mapping helpers
  fs: add is_idmapped_mnt() helper

Bug: 256243893
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: Ia7b419ef516dee40be32968cd7c60ce0adabca99

Documentation/filesystems/fscrypt.rst

@@ -338,6 +338,7 @@ Currently, the following pairs of encryption modes are supported:
 - AES-128-CBC for contents and AES-128-CTS-CBC for filenames
 - Adiantum for both contents and filenames
 - AES-256-XTS for contents and AES-256-HCTR2 for filenames (v2 policies only)
+- SM4-XTS for contents and SM4-CTS-CBC for filenames (v2 policies only)
 
 If unsure, you should use the (AES-256-XTS, AES-256-CTS-CBC) pair.
 
@@ -369,6 +370,12 @@ CONFIG_CRYPTO_HCTR2 must be enabled.  Also, fast implementations of XCTR and
 POLYVAL should be enabled, e.g. CRYPTO_POLYVAL_ARM64_CE and
 CRYPTO_AES_ARM64_CE_BLK for ARM64.
 
+SM4 is a Chinese block cipher that is an alternative to AES.  It has
+not seen as much security review as AES, and it only has a 128-bit key
+size.  It may be useful in cases where its use is mandated.
+Otherwise, it should not be used.  For SM4 support to be available, it
+also needs to be enabled in the kernel crypto API.
+
 New encryption modes can be added relatively easily, without changes
 to individual filesystems.  However, authenticated encryption (AE)
 modes are not currently supported because of the difficulty of dealing

arch/parisc/include/asm/cacheflush.h

@@ -27,7 +27,7 @@ void flush_kernel_icache_range_asm(unsigned long, unsigned long);
 void flush_user_dcache_range_asm(unsigned long, unsigned long);
 void flush_kernel_dcache_range_asm(unsigned long, unsigned long);
 void purge_kernel_dcache_range_asm(unsigned long, unsigned long);
-void flush_kernel_dcache_page_asm(void *);
+void flush_kernel_dcache_page_asm(const void *addr);
 void flush_kernel_icache_page(void *);
 
 /* Cache flush operations */
@@ -36,7 +36,7 @@ void flush_cache_all_local(void);
 void flush_cache_all(void);
 void flush_cache_mm(struct mm_struct *mm);
 
-void flush_kernel_dcache_page_addr(void *addr);
+void flush_kernel_dcache_page_addr(const void *addr);
 
 #define flush_kernel_dcache_range(start,size) \
 	flush_kernel_dcache_range_asm((start), (start)+(size));
@@ -97,7 +97,7 @@ flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vma
 }
 
 #define ARCH_HAS_FLUSH_ON_KUNMAP
-static inline void kunmap_flush_on_unmap(void *addr)
+static inline void kunmap_flush_on_unmap(const void *addr)
 {
 	flush_kernel_dcache_page_addr(addr);
 }

arch/parisc/kernel/cache.c

@@ -448,7 +448,7 @@ extern void purge_kernel_dcache_page_asm(unsigned long);
 extern void clear_user_page_asm(void *, unsigned long);
 extern void copy_user_page_asm(void *, void *, unsigned long);
 
-void flush_kernel_dcache_page_addr(void *addr)
+void flush_kernel_dcache_page_addr(const void *addr)
 {
 	unsigned long flags;
 

block/blk-crypto.c

@@ -39,6 +39,13 @@ const struct blk_crypto_mode blk_crypto_modes[] = {
 		.security_strength = 32,
 		.ivsize = 32,
 	},
+	[BLK_ENCRYPTION_MODE_SM4_XTS] = {
+		.name = "SM4-XTS",
+		.cipher_str = "xts(sm4)",
+		.keysize = 32,
+		.security_strength = 16,
+		.ivsize = 16,
+	},
 };
 
 /*

fs/crypto/fname.c

@@ -86,7 +86,8 @@ static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
 /**
  * fscrypt_fname_encrypt() - encrypt a filename
  * @inode: inode of the parent directory (for regular filenames)
- *	   or of the symlink (for symlink targets)
+ *	   or of the symlink (for symlink targets). Key must already be
+ *	   set up.
  * @iname: the filename to encrypt
  * @out: (output) the encrypted filename
  * @olen: size of the encrypted filename.  It must be at least @iname->len.
@@ -137,6 +138,7 @@ int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(fscrypt_fname_encrypt);
 
 /**
  * fname_decrypt() - decrypt a filename
@@ -264,9 +266,9 @@ static int fscrypt_base64url_decode(const char *src, int srclen, u8 *dst)
 	return bp - dst;
 }
 
-bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
+bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
-				  u32 orig_len, u32 max_len,
+				    u32 orig_len, u32 max_len,
-				  u32 *encrypted_len_ret)
+				    u32 *encrypted_len_ret)
 {
 	int padding = 4 << (fscrypt_policy_flags(policy) &
 			    FSCRYPT_POLICY_FLAGS_PAD_MASK);
@@ -280,6 +282,29 @@ bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
 	return true;
 }
 
+/**
+ * fscrypt_fname_encrypted_size() - calculate length of encrypted filename
+ * @inode:		parent inode of dentry name being encrypted. Key must
+ *			already be set up.
+ * @orig_len:		length of the original filename
+ * @max_len:		maximum length to return
+ * @encrypted_len_ret:	where calculated length should be returned (on success)
+ *
+ * Filenames that are shorter than the maximum length may have their lengths
+ * increased slightly by encryption, due to padding that is applied.
+ *
+ * Return: false if the orig_len is greater than max_len. Otherwise, true and
+ *	   fill out encrypted_len_ret with the length (up to max_len).
+ */
+bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len,
+				  u32 max_len, u32 *encrypted_len_ret)
+{
+	return __fscrypt_fname_encrypted_size(&inode->i_crypt_info->ci_policy,
+					      orig_len, max_len,
+					      encrypted_len_ret);
+}
+EXPORT_SYMBOL_GPL(fscrypt_fname_encrypted_size);
+
 /**
  * fscrypt_fname_alloc_buffer() - allocate a buffer for presented filenames
  * @max_encrypted_len: maximum length of encrypted filenames the buffer will be
@@ -435,8 +460,7 @@ int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname,
 		return ret;
 
 	if (fscrypt_has_encryption_key(dir)) {
-		if (!fscrypt_fname_encrypted_size(&dir->i_crypt_info->ci_policy,
+		if (!fscrypt_fname_encrypted_size(dir, iname->len, NAME_MAX,
-						  iname->len, NAME_MAX,
 						  &fname->crypto_buf.len))
 			return -ENAMETOOLONG;
 		fname->crypto_buf.name = kmalloc(fname->crypto_buf.len,

fs/crypto/fscrypt_private.h

@@ -318,14 +318,11 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num,
 			 const struct fscrypt_info *ci);
 
 /* fname.c */
-int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
+bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
-			  u8 *out, unsigned int olen);
+				    u32 orig_len, u32 max_len,
-bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
+				    u32 *encrypted_len_ret);
-				  u32 orig_len, u32 max_len,
-				  u32 *encrypted_len_ret);
 
 /* hkdf.c */
-
 struct fscrypt_hkdf {
 	struct crypto_shash *hmac_tfm;
 };
@@ -498,13 +495,7 @@ struct fscrypt_master_key_secret {
 struct fscrypt_master_key {
 
 	/*
-	 * Back-pointer to the super_block of the filesystem to which this
+	 * Link in ->s_master_keys->key_hashtable.
-	 * master key has been added.  Only valid if ->mk_active_refs > 0.
-	 */
-	struct super_block			*mk_sb;
-
-	/*
-	 * Link in ->mk_sb->s_master_keys->key_hashtable.
 	 * Only valid if ->mk_active_refs > 0.
 	 */
 	struct hlist_node			mk_node;
@@ -515,7 +506,7 @@ struct fscrypt_master_key {
 	/*
 	 * Active and structural reference counts.  An active ref guarantees
 	 * that the struct continues to exist, continues to be in the keyring
-	 * ->mk_sb->s_master_keys, and that any embedded subkeys (e.g.
+	 * ->s_master_keys, and that any embedded subkeys (e.g.
 	 * ->mk_direct_keys) that have been prepared continue to exist.
 	 * A structural ref only guarantees that the struct continues to exist.
 	 *
@@ -628,7 +619,8 @@ static inline int master_key_spec_len(const struct fscrypt_key_specifier *spec)
 
 void fscrypt_put_master_key(struct fscrypt_master_key *mk);
 
-void fscrypt_put_master_key_activeref(struct fscrypt_master_key *mk);
+void fscrypt_put_master_key_activeref(struct super_block *sb,
+				      struct fscrypt_master_key *mk);
 
 struct fscrypt_master_key *
 fscrypt_find_master_key(struct super_block *sb,

fs/crypto/hooks.c

@@ -224,9 +224,9 @@ int fscrypt_prepare_symlink(struct inode *dir, const char *target,
 	 * counting it (even though it is meaningless for ciphertext) is simpler
 	 * for now since filesystems will assume it is there and subtract it.
 	 */
-	if (!fscrypt_fname_encrypted_size(policy, len,
+	if (!__fscrypt_fname_encrypted_size(policy, len,
-					  max_len - sizeof(struct fscrypt_symlink_data),
+					    max_len - sizeof(struct fscrypt_symlink_data),
-					  &disk_link->len))
+					    &disk_link->len))
 		return -ENAMETOOLONG;
 	disk_link->len += sizeof(struct fscrypt_symlink_data);
 

fs/crypto/keyring.c

@@ -79,10 +79,9 @@ void fscrypt_put_master_key(struct fscrypt_master_key *mk)
 	call_rcu(&mk->mk_rcu_head, fscrypt_free_master_key);
 }
 
-void fscrypt_put_master_key_activeref(struct fscrypt_master_key *mk)
+void fscrypt_put_master_key_activeref(struct super_block *sb,
+				      struct fscrypt_master_key *mk)
 {
-	struct super_block *sb = mk->mk_sb;
-	struct fscrypt_keyring *keyring = sb->s_master_keys;
 	size_t i;
 
 	if (!refcount_dec_and_test(&mk->mk_active_refs))
@@ -93,9 +92,9 @@ void fscrypt_put_master_key_activeref(struct fscrypt_master_key *mk)
 	 * destroying any subkeys embedded in it.
 	 */
 
-	spin_lock(&keyring->lock);
+	spin_lock(&sb->s_master_keys->lock);
 	hlist_del_rcu(&mk->mk_node);
-	spin_unlock(&keyring->lock);
+	spin_unlock(&sb->s_master_keys->lock);
 
 	/*
 	 * ->mk_active_refs == 0 implies that ->mk_secret is not present and
@@ -243,7 +242,7 @@ void fscrypt_destroy_keyring(struct super_block *sb)
 			WARN_ON(refcount_read(&mk->mk_struct_refs) != 1);
 			WARN_ON(!is_master_key_secret_present(&mk->mk_secret));
 			wipe_master_key_secret(&mk->mk_secret);
-			fscrypt_put_master_key_activeref(mk);
+			fscrypt_put_master_key_activeref(sb, mk);
 		}
 	}
 	kfree_sensitive(keyring);
@@ -424,7 +423,6 @@ static int add_new_master_key(struct super_block *sb,
 	if (!mk)
 		return -ENOMEM;
 
-	mk->mk_sb = sb;
 	init_rwsem(&mk->mk_sem);
 	refcount_set(&mk->mk_struct_refs, 1);
 	mk->mk_spec = *mk_spec;
@@ -1099,7 +1097,7 @@ static int do_remove_key(struct file *filp, void __user *_uarg, bool all_users)
 	err = -ENOKEY;
 	if (is_master_key_secret_present(&mk->mk_secret)) {
 		wipe_master_key_secret(&mk->mk_secret);
-		fscrypt_put_master_key_activeref(mk);
+		fscrypt_put_master_key_activeref(sb, mk);
 		err = 0;
 	}
 	inodes_remain = refcount_read(&mk->mk_active_refs) > 0;

fs/crypto/keysetup.c

@@ -44,6 +44,21 @@ struct fscrypt_mode fscrypt_modes[] = {
 		.security_strength = 16,
 		.ivsize = 16,
 	},
+	[FSCRYPT_MODE_SM4_XTS] = {
+		.friendly_name = "SM4-XTS",
+		.cipher_str = "xts(sm4)",
+		.keysize = 32,
+		.security_strength = 16,
+		.ivsize = 16,
+		.blk_crypto_mode = BLK_ENCRYPTION_MODE_SM4_XTS,
+	},
+	[FSCRYPT_MODE_SM4_CTS] = {
+		.friendly_name = "SM4-CTS-CBC",
+		.cipher_str = "cts(cbc(sm4))",
+		.keysize = 16,
+		.security_strength = 16,
+		.ivsize = 16,
+	},
 	[FSCRYPT_MODE_ADIANTUM] = {
 		.friendly_name = "Adiantum",
 		.cipher_str = "adiantum(xchacha12,aes)",
@@ -556,7 +571,7 @@ static void put_crypt_info(struct fscrypt_info *ci)
 		spin_lock(&mk->mk_decrypted_inodes_lock);
 		list_del(&ci->ci_master_key_link);
 		spin_unlock(&mk->mk_decrypted_inodes_lock);
-		fscrypt_put_master_key_activeref(mk);
+		fscrypt_put_master_key_activeref(ci->ci_inode->i_sb, mk);
 	}
 	memzero_explicit(ci, sizeof(*ci));
 	kmem_cache_free(fscrypt_info_cachep, ci);

fs/crypto/policy.c

@@ -61,6 +61,13 @@ fscrypt_get_dummy_policy(struct super_block *sb)
 	return sb->s_cop->get_dummy_policy(sb);
 }
 
+/*
+ * Return %true if the given combination of encryption modes is supported for v1
+ * (and later) encryption policies.
+ *
+ * Do *not* add anything new here, since v1 encryption policies are deprecated.
+ * New combinations of modes should go in fscrypt_valid_enc_modes_v2() only.
+ */
 static bool fscrypt_valid_enc_modes_v1(u32 contents_mode, u32 filenames_mode)
 {
 	if (contents_mode == FSCRYPT_MODE_AES_256_XTS &&
@@ -83,6 +90,11 @@ static bool fscrypt_valid_enc_modes_v2(u32 contents_mode, u32 filenames_mode)
 	if (contents_mode == FSCRYPT_MODE_AES_256_XTS &&
 	    filenames_mode == FSCRYPT_MODE_AES_256_HCTR2)
 		return true;
+
+	if (contents_mode == FSCRYPT_MODE_SM4_XTS &&
+	    filenames_mode == FSCRYPT_MODE_SM4_CTS)
+		return true;
+
 	return fscrypt_valid_enc_modes_v1(contents_mode, filenames_mode);
 }
 
@@ -693,6 +705,32 @@ const union fscrypt_policy *fscrypt_policy_to_inherit(struct inode *dir)
 	return fscrypt_get_dummy_policy(dir->i_sb);
 }
 
+/**
+ * fscrypt_context_for_new_inode() - create an encryption context for a new inode
+ * @ctx: where context should be written
+ * @inode: inode from which to fetch policy and nonce
+ *
+ * Given an in-core "prepared" (via fscrypt_prepare_new_inode) inode,
+ * generate a new context and write it to ctx. ctx _must_ be at least
+ * FSCRYPT_SET_CONTEXT_MAX_SIZE bytes.
+ *
+ * Return: size of the resulting context or a negative error code.
+ */
+int fscrypt_context_for_new_inode(void *ctx, struct inode *inode)
+{
+	struct fscrypt_info *ci = inode->i_crypt_info;
+
+	BUILD_BUG_ON(sizeof(union fscrypt_context) !=
+			FSCRYPT_SET_CONTEXT_MAX_SIZE);
+
+	/* fscrypt_prepare_new_inode() should have set up the key already. */
+	if (WARN_ON_ONCE(!ci))
+		return -ENOKEY;
+
+	return fscrypt_new_context(ctx, &ci->ci_policy, ci->ci_nonce);
+}
+EXPORT_SYMBOL_GPL(fscrypt_context_for_new_inode);
+
 /**
  * fscrypt_set_context() - Set the fscrypt context of a new inode
  * @inode: a new inode
@@ -709,12 +747,9 @@ int fscrypt_set_context(struct inode *inode, void *fs_data)
 	union fscrypt_context ctx;
 	int ctxsize;
 
-	/* fscrypt_prepare_new_inode() should have set up the key already. */
+	ctxsize = fscrypt_context_for_new_inode(&ctx, inode);
-	if (WARN_ON_ONCE(!ci))
+	if (ctxsize < 0)
-		return -ENOKEY;
+		return ctxsize;
-
-	BUILD_BUG_ON(sizeof(ctx) != FSCRYPT_SET_CONTEXT_MAX_SIZE);
-	ctxsize = fscrypt_new_context(&ctx, &ci->ci_policy, ci->ci_nonce);
 
 	/*
 	 * This may be the first time the inode number is available, so do any

fs/ext4/readpage.c

@@ -76,14 +76,10 @@ static void __read_end_io(struct bio *bio)
 	bio_for_each_segment_all(bv, bio, iter_all) {
 		page = bv->bv_page;
 
-		/* PG_error was set if verity failed. */
+		if (bio->bi_status)
-		if (bio->bi_status || PageError(page)) {
 			ClearPageUptodate(page);
-			/* will re-read again later */
+		else
-			ClearPageError(page);
-		} else {
 			SetPageUptodate(page);
-		}
 		unlock_page(page);
 	}
 	if (bio->bi_private)

fs/f2fs/compress.c

@@ -1707,50 +1707,27 @@ static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
 	}
 }
 
-/*
- * Update and unlock the cluster's pagecache pages, and release the reference to
- * the decompress_io_ctx that was being held for I/O completion.
- */
-static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
-				bool in_task)
-{
-	int i;
-
-	for (i = 0; i < dic->cluster_size; i++) {
-		struct page *rpage = dic->rpages[i];
-
-		if (!rpage)
-			continue;
-
-		/* PG_error was set if verity failed. */
-		if (failed || PageError(rpage)) {
-			ClearPageUptodate(rpage);
-			/* will re-read again later */
-			ClearPageError(rpage);
-		} else {
-			SetPageUptodate(rpage);
-		}
-		unlock_page(rpage);
-	}
-
-	f2fs_put_dic(dic, in_task);
-}
-
 static void f2fs_verify_cluster(struct work_struct *work)
 {
 	struct decompress_io_ctx *dic =
 		container_of(work, struct decompress_io_ctx, verity_work);
 	int i;
 
-	/* Verify the cluster's decompressed pages with fs-verity. */
+	/* Verify, update, and unlock the decompressed pages. */
 	for (i = 0; i < dic->cluster_size; i++) {
 		struct page *rpage = dic->rpages[i];
 
-		if (rpage && !fsverity_verify_page(rpage))
+		if (!rpage)
-			SetPageError(rpage);
+			continue;
+
+		if (fsverity_verify_page(rpage))
+			SetPageUptodate(rpage);
+		else
+			ClearPageUptodate(rpage);
+		unlock_page(rpage);
 	}
 
-	__f2fs_decompress_end_io(dic, false, true);
+	f2fs_put_dic(dic, true);
 }
 
 /*
@@ -1760,6 +1737,8 @@ static void f2fs_verify_cluster(struct work_struct *work)
 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
 				bool in_task)
 {
+	int i;
+
 	if (!failed && dic->need_verity) {
 		/*
 		 * Note that to avoid deadlocks, the verity work can't be done
@@ -1769,9 +1748,28 @@ void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
 		 */
 		INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
 		fsverity_enqueue_verify_work(&dic->verity_work);
-	} else {
+		return;
-		__f2fs_decompress_end_io(dic, failed, in_task);
 	}
+
+	/* Update and unlock the cluster's pagecache pages. */
+	for (i = 0; i < dic->cluster_size; i++) {
+		struct page *rpage = dic->rpages[i];
+
+		if (!rpage)
+			continue;
+
+		if (failed)
+			ClearPageUptodate(rpage);
+		else
+			SetPageUptodate(rpage);
+		unlock_page(rpage);
+	}
+
+	/*
+	 * Release the reference to the decompress_io_ctx that was being held
+	 * for I/O completion.
+	 */
+	f2fs_put_dic(dic, in_task);
 }
 
 /*

fs/f2fs/data.c

@@ -115,43 +115,56 @@ struct bio_post_read_ctx {
 	struct f2fs_sb_info *sbi;
 	struct work_struct work;
 	unsigned int enabled_steps;
+	/*
+	 * decompression_attempted keeps track of whether
+	 * f2fs_end_read_compressed_page() has been called on the pages in the
+	 * bio that belong to a compressed cluster yet.
+	 */
+	bool decompression_attempted;
 	block_t fs_blkaddr;
 };
 
+/*
+ * Update and unlock a bio's pages, and free the bio.
+ *
+ * This marks pages up-to-date only if there was no error in the bio (I/O error,
+ * decryption error, or verity error), as indicated by bio->bi_status.
+ *
+ * "Compressed pages" (pagecache pages backed by a compressed cluster on-disk)
+ * aren't marked up-to-date here, as decompression is done on a per-compression-
+ * cluster basis rather than a per-bio basis.  Instead, we only must do two
+ * things for each compressed page here: call f2fs_end_read_compressed_page()
+ * with failed=true if an error occurred before it would have normally gotten
+ * called (i.e., I/O error or decryption error, but *not* verity error), and
+ * release the bio's reference to the decompress_io_ctx of the page's cluster.
+ */
 static void f2fs_finish_read_bio(struct bio *bio, bool in_task)
 {
 	struct bio_vec *bv;
 	struct bvec_iter_all iter_all;
+	struct bio_post_read_ctx *ctx = bio->bi_private;
 
-	/*
-	 * Update and unlock the bio's pagecache pages, and put the
-	 * decompression context for any compressed pages.
-	 */
 	bio_for_each_segment_all(bv, bio, iter_all) {
 		struct page *page = bv->bv_page;
 
 		if (f2fs_is_compressed_page(page)) {
-			if (bio->bi_status)
+			if (ctx && !ctx->decompression_attempted)
 				f2fs_end_read_compressed_page(page, true, 0,
 							in_task);
 			f2fs_put_page_dic(page, in_task);
 			continue;
 		}
 
-		/* PG_error was set if verity failed. */
+		if (bio->bi_status)
-		if (bio->bi_status || PageError(page)) {
 			ClearPageUptodate(page);
-			/* will re-read again later */
+		else
-			ClearPageError(page);
-		} else {
 			SetPageUptodate(page);
-		}
 		dec_page_count(F2FS_P_SB(page), __read_io_type(page));
 		unlock_page(page);
 	}
 
-	if (bio->bi_private)
+	if (ctx)
-		mempool_free(bio->bi_private, bio_post_read_ctx_pool);
+		mempool_free(ctx, bio_post_read_ctx_pool);
 	bio_put(bio);
 }
 
@@ -184,8 +197,10 @@ static void f2fs_verify_bio(struct work_struct *work)
 			struct page *page = bv->bv_page;
 
 			if (!f2fs_is_compressed_page(page) &&
-			    !fsverity_verify_page(page))
+			    !fsverity_verify_page(page)) {
-				SetPageError(page);
+				bio->bi_status = BLK_STS_IOERR;
+				break;
+			}
 		}
 	} else {
 		fsverity_verify_bio(bio);
@@ -244,6 +259,8 @@ static void f2fs_handle_step_decompress(struct bio_post_read_ctx *ctx,
 		blkaddr++;
 	}
 
+	ctx->decompression_attempted = true;
+
 	/*
 	 * Optimization: if all the bio's pages are compressed, then scheduling
 	 * the per-bio verity work is unnecessary, as verity will be fully
@@ -1066,6 +1083,7 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
 		ctx->sbi = sbi;
 		ctx->enabled_steps = post_read_steps;
 		ctx->fs_blkaddr = blkaddr;
+		ctx->decompression_attempted = false;
 		bio->bi_private = ctx;
 	}
 	iostat_alloc_and_bind_ctx(sbi, bio, ctx);
@@ -1092,7 +1110,6 @@ static int f2fs_submit_page_read(struct inode *inode, struct page *page,
 		bio_put(bio);
 		return -EFAULT;
 	}
-	ClearPageError(page);
 	inc_page_count(sbi, F2FS_RD_DATA);
 	f2fs_update_iostat(sbi, NULL, FS_DATA_READ_IO, F2FS_BLKSIZE);
 	__submit_bio(sbi, bio, DATA);
@@ -2157,7 +2174,6 @@ submit_and_realloc:
 	inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA);
 	f2fs_update_iostat(F2FS_I_SB(inode), NULL, FS_DATA_READ_IO,
 							F2FS_BLKSIZE);
-	ClearPageError(page);
 	*last_block_in_bio = block_nr;
 	goto out;
 confused:
@@ -2184,7 +2200,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 	sector_t last_block_in_file;
 	const unsigned blocksize = blks_to_bytes(inode, 1);
 	struct decompress_io_ctx *dic = NULL;
-	struct extent_info ei = {0, };
+	struct extent_info ei = {};
 	bool from_dnode = true;
 	int i;
 	int ret = 0;
@@ -2311,7 +2327,6 @@ submit_and_realloc:
 
 		inc_page_count(sbi, F2FS_RD_DATA);
 		f2fs_update_iostat(sbi, inode, FS_DATA_READ_IO, F2FS_BLKSIZE);
-		ClearPageError(page);
 		*last_block_in_bio = blkaddr;
 	}
 
@@ -2328,7 +2343,6 @@ out:
 	for (i = 0; i < cc->cluster_size; i++) {
 		if (cc->rpages[i]) {
 			ClearPageUptodate(cc->rpages[i]);
-			ClearPageError(cc->rpages[i]);
 			unlock_page(cc->rpages[i]);
 		}
 	}
@@ -2425,7 +2439,6 @@ read_single_page:
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 set_error_page:
 #endif
-			SetPageError(page);
 			zero_user_segment(page, 0, PAGE_SIZE);
 			unlock_page(page);
 		}

fs/f2fs/extent_cache.c

@@ -546,7 +546,8 @@ static bool __lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
 	struct extent_node *en;
 	bool ret = false;
 
-	f2fs_bug_on(sbi, !et);
+	if (!et)
+		return false;
 
 	trace_f2fs_lookup_extent_tree_start(inode, pgofs, type);
 
@@ -881,12 +882,14 @@ static unsigned long long __calculate_block_age(unsigned long long new,
 }
 
 /* This returns a new age and allocated blocks in ei */
-static int __get_new_block_age(struct inode *inode, struct extent_info *ei)
+static int __get_new_block_age(struct inode *inode, struct extent_info *ei,
+						block_t blkaddr)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	loff_t f_size = i_size_read(inode);
 	unsigned long long cur_blocks =
 				atomic64_read(&sbi->allocated_data_blocks);
+	struct extent_info tei = *ei;	/* only fofs and len are valid */
 
 	/*
 	 * When I/O is not aligned to a PAGE_SIZE, update will happen to the last
@@ -894,20 +897,20 @@ static int __get_new_block_age(struct inode *inode, struct extent_info *ei)
 	 * block here.
 	 */
 	if ((f_size >> PAGE_SHIFT) == ei->fofs && f_size & (PAGE_SIZE - 1) &&
-			ei->blk == NEW_ADDR)
+			blkaddr == NEW_ADDR)
 		return -EINVAL;
 
-	if (__lookup_extent_tree(inode, ei->fofs, ei, EX_BLOCK_AGE)) {
+	if (__lookup_extent_tree(inode, ei->fofs, &tei, EX_BLOCK_AGE)) {
 		unsigned long long cur_age;
 
-		if (cur_blocks >= ei->last_blocks)
+		if (cur_blocks >= tei.last_blocks)
-			cur_age = cur_blocks - ei->last_blocks;
+			cur_age = cur_blocks - tei.last_blocks;
 		else
 			/* allocated_data_blocks overflow */
-			cur_age = ULLONG_MAX - ei->last_blocks + cur_blocks;
+			cur_age = ULLONG_MAX - tei.last_blocks + cur_blocks;
 
-		if (ei->age)
+		if (tei.age)
-			ei->age = __calculate_block_age(cur_age, ei->age);
+			ei->age = __calculate_block_age(cur_age, tei.age);
 		else
 			ei->age = cur_age;
 		ei->last_blocks = cur_blocks;
@@ -915,14 +918,14 @@ static int __get_new_block_age(struct inode *inode, struct extent_info *ei)
 		return 0;
 	}
 
-	f2fs_bug_on(sbi, ei->blk == NULL_ADDR);
+	f2fs_bug_on(sbi, blkaddr == NULL_ADDR);
 
 	/* the data block was allocated for the first time */
-	if (ei->blk == NEW_ADDR)
+	if (blkaddr == NEW_ADDR)
 		goto out;
 
-	if (__is_valid_data_blkaddr(ei->blk) &&
+	if (__is_valid_data_blkaddr(blkaddr) &&
-			!f2fs_is_valid_blkaddr(sbi, ei->blk, DATA_GENERIC_ENHANCE)) {
+	    !f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE)) {
 		f2fs_bug_on(sbi, 1);
 		return -EINVAL;
 	}
@@ -938,7 +941,7 @@ out:
 
 static void __update_extent_cache(struct dnode_of_data *dn, enum extent_type type)
 {
-	struct extent_info ei;
+	struct extent_info ei = {};
 
 	if (!__may_extent_tree(dn->inode, type))
 		return;
@@ -953,8 +956,7 @@ static void __update_extent_cache(struct dnode_of_data *dn, enum extent_type typ
 		else
 			ei.blk = dn->data_blkaddr;
 	} else if (type == EX_BLOCK_AGE) {
-		ei.blk = dn->data_blkaddr;
+		if (__get_new_block_age(dn->inode, &ei, dn->data_blkaddr))
-		if (__get_new_block_age(dn->inode, &ei))
 			return;
 	}
 	__update_extent_tree_range(dn->inode, &ei, type);

fs/f2fs/file.c

@@ -2548,7 +2548,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
 	struct f2fs_map_blocks map = { .m_next_extent = NULL,
 					.m_seg_type = NO_CHECK_TYPE,
 					.m_may_create = false };
-	struct extent_info ei = {0, };
+	struct extent_info ei = {};
 	pgoff_t pg_start, pg_end, next_pgofs;
 	unsigned int blk_per_seg = sbi->blocks_per_seg;
 	unsigned int total = 0, sec_num;

fs/f2fs/segment.c

@@ -662,8 +662,7 @@ init_thread:
 	if (IS_ERR(fcc->f2fs_issue_flush)) {
 		int err = PTR_ERR(fcc->f2fs_issue_flush);
 
-		kfree(fcc);
+		fcc->f2fs_issue_flush = NULL;
-		SM_I(sbi)->fcc_info = NULL;
 		return err;
 	}
 
@@ -3162,7 +3161,7 @@ static int __get_segment_type_4(struct f2fs_io_info *fio)
 static int __get_age_segment_type(struct inode *inode, pgoff_t pgofs)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
-	struct extent_info ei;
+	struct extent_info ei = {};
 
 	if (f2fs_lookup_age_extent_cache(inode, pgofs, &ei)) {
 		if (!ei.age)
@@ -5139,11 +5138,9 @@ int f2fs_build_segment_manager(struct f2fs_sb_info *sbi)
 
 	init_f2fs_rwsem(&sm_info->curseg_lock);
 
-	if (!f2fs_readonly(sbi->sb)) {
+	err = f2fs_create_flush_cmd_control(sbi);
-		err = f2fs_create_flush_cmd_control(sbi);
+	if (err)
-		if (err)
+		return err;
-			return err;
-	}
 
 	err = create_discard_cmd_control(sbi);
 	if (err)

fs/verity/Kconfig

@@ -3,6 +3,7 @@
 config FS_VERITY
 	bool "FS Verity (read-only file-based authenticity protection)"
 	select CRYPTO
+	select CRYPTO_HASH_INFO
 	# SHA-256 is implied as it's intended to be the default hash algorithm.
 	# To avoid bloat, other wanted algorithms must be selected explicitly.
 	# Note that CRYPTO_SHA256 denotes the generic C implementation, but

fs/verity/enable.c

@@ -202,7 +202,7 @@ static int enable_verity(struct file *filp,
 	const struct fsverity_operations *vops = inode->i_sb->s_vop;
 	struct merkle_tree_params params = { };
 	struct fsverity_descriptor *desc;
-	size_t desc_size = sizeof(*desc) + arg->sig_size;
+	size_t desc_size = struct_size(desc, signature, arg->sig_size);
 	struct fsverity_info *vi;
 	int err;
 
@@ -281,7 +281,7 @@ static int enable_verity(struct file *filp,
 	 * from disk.  This is simpler, and it serves as an extra check that the
 	 * metadata we're writing is valid before actually enabling verity.
 	 */
-	vi = fsverity_create_info(inode, desc, desc_size);
+	vi = fsverity_create_info(inode, desc);
 	if (IS_ERR(vi)) {
 		err = PTR_ERR(vi);
 		goto rollback;

fs/verity/fsverity_private.h

@@ -14,7 +14,6 @@
 
 #define pr_fmt(fmt) "fs-verity: " fmt
 
-#include <crypto/sha2.h>
 #include <linux/fsverity.h>
 #include <linux/mempool.h>
 
@@ -26,12 +25,6 @@ struct ahash_request;
  */
 #define FS_VERITY_MAX_LEVELS		8
 
-/*
- * Largest digest size among all hash algorithms supported by fs-verity.
- * Currently assumed to be <= size of fsverity_descriptor::root_hash.
- */
-#define FS_VERITY_MAX_DIGEST_SIZE	SHA512_DIGEST_SIZE
-
 /* A hash algorithm supported by fs-verity */
 struct fsverity_hash_alg {
 	struct crypto_ahash *tfm; /* hash tfm, allocated on demand */
@@ -39,6 +32,11 @@ struct fsverity_hash_alg {
 	unsigned int digest_size; /* digest size in bytes, e.g. 32 for SHA-256 */
 	unsigned int block_size;  /* block size in bytes, e.g. 64 for SHA-256 */
 	mempool_t req_pool;	  /* mempool with a preallocated hash request */
+	/*
+	 * The HASH_ALGO_* constant for this algorithm.  This is different from
+	 * FS_VERITY_HASH_ALG_*, which uses a different numbering scheme.
+	 */
+	enum hash_algo algo_id;
 };
 
 /* Merkle tree parameters: hash algorithm, initial hash state, and topology */
@@ -122,16 +120,14 @@ int fsverity_init_merkle_tree_params(struct merkle_tree_params *params,
 				     const u8 *salt, size_t salt_size);
 
 struct fsverity_info *fsverity_create_info(const struct inode *inode,
-					   struct fsverity_descriptor *desc,
+					   struct fsverity_descriptor *desc);
-					   size_t desc_size);
 
 void fsverity_set_info(struct inode *inode, struct fsverity_info *vi);
 
 void fsverity_free_info(struct fsverity_info *vi);
 
 int fsverity_get_descriptor(struct inode *inode,
-			    struct fsverity_descriptor **desc_ret,
+			    struct fsverity_descriptor **desc_ret);
-			    size_t *desc_size_ret);
 
 int __init fsverity_init_info_cache(void);
 void __init fsverity_exit_info_cache(void);

fs/verity/hash_algs.c

@@ -16,11 +16,13 @@ struct fsverity_hash_alg fsverity_hash_algs[] = {
 		.name = "sha256",
 		.digest_size = SHA256_DIGEST_SIZE,
 		.block_size = SHA256_BLOCK_SIZE,
+		.algo_id = HASH_ALGO_SHA256,
 	},
 	[FS_VERITY_HASH_ALG_SHA512] = {
 		.name = "sha512",
 		.digest_size = SHA512_DIGEST_SIZE,
 		.block_size = SHA512_BLOCK_SIZE,
+		.algo_id = HASH_ALGO_SHA512,
 	},
 };
 
@@ -324,5 +326,9 @@ void __init fsverity_check_hash_algs(void)
 		 */
 		BUG_ON(!is_power_of_2(alg->digest_size));
 		BUG_ON(!is_power_of_2(alg->block_size));
+
+		/* Verify that there is a valid mapping to HASH_ALGO_*. */
+		BUG_ON(alg->algo_id == 0);
+		BUG_ON(alg->digest_size != hash_digest_size[alg->algo_id]);
 	}
 }

fs/verity/measure.c

@@ -57,3 +57,31 @@ int fsverity_ioctl_measure(struct file *filp, void __user *_uarg)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(fsverity_ioctl_measure);
+
+/**
+ * fsverity_get_digest() - get a verity file's digest
+ * @inode: inode to get digest of
+ * @digest: (out) pointer to the digest
+ * @alg: (out) pointer to the hash algorithm enumeration
+ *
+ * Return the file hash algorithm and digest of an fsverity protected file.
+ * Assumption: before calling this, the file must have been opened.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int fsverity_get_digest(struct inode *inode,
+			u8 digest[FS_VERITY_MAX_DIGEST_SIZE],
+			enum hash_algo *alg)
+{
+	const struct fsverity_info *vi;
+	const struct fsverity_hash_alg *hash_alg;
+
+	vi = fsverity_get_info(inode);
+	if (!vi)
+		return -ENODATA; /* not a verity file */
+
+	hash_alg = vi->tree_params.hash_alg;
+	memcpy(digest, vi->file_digest, hash_alg->digest_size);
+	*alg = hash_alg->algo_id;
+	return 0;
+}

fs/verity/open.c

@@ -147,8 +147,7 @@ static int compute_file_digest(struct fsverity_hash_alg *hash_alg,
  * fsverity_descriptor must have already undergone basic validation.
  */
 struct fsverity_info *fsverity_create_info(const struct inode *inode,
-					   struct fsverity_descriptor *desc,
+					   struct fsverity_descriptor *desc)
-					   size_t desc_size)
 {
 	struct fsverity_info *vi;
 	int err;
@@ -264,8 +263,7 @@ static bool validate_fsverity_descriptor(struct inode *inode,
  * the filesystem, and do basic validation of it.
  */
 int fsverity_get_descriptor(struct inode *inode,
-			    struct fsverity_descriptor **desc_ret,
+			    struct fsverity_descriptor **desc_ret)
-			    size_t *desc_size_ret)
 {
 	int res;
 	struct fsverity_descriptor *desc;
@@ -297,7 +295,6 @@ int fsverity_get_descriptor(struct inode *inode,
 	}
 
 	*desc_ret = desc;
-	*desc_size_ret = res;
 	return 0;
 }
 
@@ -306,17 +303,16 @@ static int ensure_verity_info(struct inode *inode)
 {
 	struct fsverity_info *vi = fsverity_get_info(inode);
 	struct fsverity_descriptor *desc;
-	size_t desc_size;
 	int err;
 
 	if (vi)
 		return 0;
 
-	err = fsverity_get_descriptor(inode, &desc, &desc_size);
+	err = fsverity_get_descriptor(inode, &desc);
 	if (err)
 		return err;
 
-	vi = fsverity_create_info(inode, desc, desc_size);
+	vi = fsverity_create_info(inode, desc);
 	if (IS_ERR(vi)) {
 		err = PTR_ERR(vi);
 		goto out_free_desc;

fs/verity/read_metadata.c

@@ -53,14 +53,14 @@ static int fsverity_read_merkle_tree(struct inode *inode,
 			break;
 		}
 
-		virt = kmap(page);
+		virt = kmap_local_page(page);
 		if (copy_to_user(buf, virt + offs_in_page, bytes_to_copy)) {
-			kunmap(page);
+			kunmap_local(virt);
 			put_page(page);
 			err = -EFAULT;
 			break;
 		}
-		kunmap(page);
+		kunmap_local(virt);
 		put_page(page);
 
 		retval += bytes_to_copy;
@@ -101,7 +101,7 @@ static int fsverity_read_descriptor(struct inode *inode,
 	size_t desc_size;
 	int res;
 
-	res = fsverity_get_descriptor(inode, &desc, &desc_size);
+	res = fsverity_get_descriptor(inode, &desc);
 	if (res)
 		return res;
 
@@ -119,10 +119,9 @@ static int fsverity_read_signature(struct inode *inode,
 				   void __user *buf, u64 offset, int length)
 {
 	struct fsverity_descriptor *desc;
-	size_t desc_size;
 	int res;
 
-	res = fsverity_get_descriptor(inode, &desc, &desc_size);
+	res = fsverity_get_descriptor(inode, &desc);
 	if (res)
 		return res;
 

fs/verity/verify.c

@@ -39,16 +39,6 @@ static void hash_at_level(const struct merkle_tree_params *params,
 		   (params->log_blocksize - params->log_arity);
 }
 
-/* Extract a hash from a hash page */
-static void extract_hash(struct page *hpage, unsigned int hoffset,
-			 unsigned int hsize, u8 *out)
-{
-	void *virt = kmap_atomic(hpage);
-
-	memcpy(out, virt + hoffset, hsize);
-	kunmap_atomic(virt);
-}
-
 static inline int cmp_hashes(const struct fsverity_info *vi,
 			     const u8 *want_hash, const u8 *real_hash,
 			     pgoff_t index, int level)
@@ -129,7 +119,7 @@ static bool verify_page(struct inode *inode, const struct fsverity_info *vi,
 		}
 
 		if (PageChecked(hpage)) {
-			extract_hash(hpage, hoffset, hsize, _want_hash);
+			memcpy_from_page(_want_hash, hpage, hoffset, hsize);
 			want_hash = _want_hash;
 			put_page(hpage);
 			pr_debug_ratelimited("Hash page already checked, want %s:%*phN\n",
@@ -158,7 +148,7 @@ descend:
 		if (err)
 			goto out;
 		SetPageChecked(hpage);
-		extract_hash(hpage, hoffset, hsize, _want_hash);
+		memcpy_from_page(_want_hash, hpage, hoffset, hsize);
 		want_hash = _want_hash;
 		put_page(hpage);
 		pr_debug("Verified hash page at level %d, now want %s:%*phN\n",
@@ -210,9 +200,8 @@ EXPORT_SYMBOL_GPL(fsverity_verify_page);
  * @bio: the bio to verify
  *
  * Verify a set of pages that have just been read from a verity file.  The pages
- * must be pagecache pages that are still locked and not yet uptodate.  Pages
+ * must be pagecache pages that are still locked and not yet uptodate.  If a
- * that fail verification are set to the Error state.  Verification is skipped
+ * page fails verification, then bio->bi_status is set to an error status.
- * for pages already in the Error state, e.g. due to fscrypt decryption failure.
  *
  * This is a helper function for use by the ->readpages() method of filesystems
  * that issue bios to read data directly into the page cache.  Filesystems that
@@ -254,9 +243,10 @@ void fsverity_verify_bio(struct bio *bio)
 		unsigned long level0_ra_pages =
 			min(max_ra_pages, params->level0_blocks - level0_index);
 
-		if (!PageError(page) &&
+		if (!verify_page(inode, vi, req, page, level0_ra_pages)) {
-		    !verify_page(inode, vi, req, page, level0_ra_pages))
+			bio->bi_status = BLK_STS_IOERR;
-			SetPageError(page);
+			break;
+		}
 	}
 
 	fsverity_free_hash_request(params->hash_alg, req);

include/linux/blk-crypto.h

@@ -13,6 +13,7 @@ enum blk_crypto_mode_num {
 	BLK_ENCRYPTION_MODE_AES_256_XTS,
 	BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV,
 	BLK_ENCRYPTION_MODE_ADIANTUM,
+	BLK_ENCRYPTION_MODE_SM4_XTS,
 	BLK_ENCRYPTION_MODE_MAX,
 };
 

include/linux/fscrypt.h

@@ -288,6 +288,7 @@ int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg);
 int fscrypt_ioctl_get_policy_ex(struct file *filp, void __user *arg);
 int fscrypt_ioctl_get_nonce(struct file *filp, void __user *arg);
 int fscrypt_has_permitted_context(struct inode *parent, struct inode *child);
+int fscrypt_context_for_new_inode(void *ctx, struct inode *inode);
 int fscrypt_set_context(struct inode *inode, void *fs_data);
 
 struct fscrypt_dummy_policy {
@@ -331,6 +332,10 @@ void fscrypt_free_inode(struct inode *inode);
 int fscrypt_drop_inode(struct inode *inode);
 
 /* fname.c */
+int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
+			  u8 *out, unsigned int olen);
+bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len,
+				  u32 max_len, u32 *encrypted_len_ret);
 int fscrypt_setup_filename(struct inode *inode, const struct qstr *iname,
 			   int lookup, struct fscrypt_name *fname);
 

include/linux/fsverity.h

@@ -12,8 +12,16 @@
 #define _LINUX_FSVERITY_H
 
 #include <linux/fs.h>
+#include <crypto/hash_info.h>
+#include <crypto/sha2.h>
 #include <uapi/linux/fsverity.h>
 
+/*
+ * Largest digest size among all hash algorithms supported by fs-verity.
+ * Currently assumed to be <= size of fsverity_descriptor::root_hash.
+ */
+#define FS_VERITY_MAX_DIGEST_SIZE	SHA512_DIGEST_SIZE
+
 /* Verity operations for filesystems */
 struct fsverity_operations {
 
@@ -131,6 +139,9 @@ int fsverity_ioctl_enable(struct file *filp, const void __user *arg);
 /* measure.c */
 
 int fsverity_ioctl_measure(struct file *filp, void __user *arg);
+int fsverity_get_digest(struct inode *inode,
+			u8 digest[FS_VERITY_MAX_DIGEST_SIZE],
+			enum hash_algo *alg);
 
 /* open.c */
 
@@ -170,6 +181,13 @@ static inline int fsverity_ioctl_measure(struct file *filp, void __user *arg)
 	return -EOPNOTSUPP;
 }
 
+static inline int fsverity_get_digest(struct inode *inode,
+				      u8 digest[FS_VERITY_MAX_DIGEST_SIZE],
+				      enum hash_algo *alg)
+{
+	return -EOPNOTSUPP;
+}
+
 /* open.c */
 
 static inline int fsverity_file_open(struct inode *inode, struct file *filp)

include/linux/highmem-internal.h

@@ -8,7 +8,7 @@
 #ifdef CONFIG_KMAP_LOCAL
 void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
 void *__kmap_local_page_prot(struct page *page, pgprot_t prot);
-void kunmap_local_indexed(void *vaddr);
+void kunmap_local_indexed(const void *vaddr);
 void kmap_local_fork(struct task_struct *tsk);
 void __kmap_local_sched_out(void);
 void __kmap_local_sched_in(void);
@@ -83,7 +83,7 @@ static inline void *kmap_local_pfn(unsigned long pfn)
 	return __kmap_local_pfn_prot(pfn, kmap_prot);
 }
 
-static inline void __kunmap_local(void *vaddr)
+static inline void __kunmap_local(const void *vaddr)
 {
 	kunmap_local_indexed(vaddr);
 }
@@ -115,7 +115,7 @@ static inline void *kmap_atomic_pfn(unsigned long pfn)
 	return __kmap_local_pfn_prot(pfn, kmap_prot);
 }
 
-static inline void __kunmap_atomic(void *addr)
+static inline void __kunmap_atomic(const void *addr)
 {
 	kunmap_local_indexed(addr);
 	pagefault_enable();
@@ -181,7 +181,7 @@ static inline void *kmap_local_pfn(unsigned long pfn)
 	return kmap_local_page(pfn_to_page(pfn));
 }
 
-static inline void __kunmap_local(void *addr)
+static inline void __kunmap_local(const void *addr)
 {
 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
 	kunmap_flush_on_unmap(addr);
@@ -208,7 +208,7 @@ static inline void *kmap_atomic_pfn(unsigned long pfn)
 	return kmap_atomic(pfn_to_page(pfn));
 }
 
-static inline void __kunmap_atomic(void *addr)
+static inline void __kunmap_atomic(const void *addr)
 {
 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
 	kunmap_flush_on_unmap(addr);

include/uapi/linux/fscrypt.h

@@ -26,6 +26,8 @@
 #define FSCRYPT_MODE_AES_256_CTS		4
 #define FSCRYPT_MODE_AES_128_CBC		5
 #define FSCRYPT_MODE_AES_128_CTS		6
+#define FSCRYPT_MODE_SM4_XTS			7
+#define FSCRYPT_MODE_SM4_CTS			8
 #define FSCRYPT_MODE_ADIANTUM			9
 #define FSCRYPT_MODE_AES_256_HCTR2		10
 /* If adding a mode number > 10, update FSCRYPT_MODE_MAX in fscrypt_private.h */
@@ -188,8 +190,6 @@ struct fscrypt_get_key_status_arg {
 #define FS_ENCRYPTION_MODE_AES_256_CTS	FSCRYPT_MODE_AES_256_CTS
 #define FS_ENCRYPTION_MODE_AES_128_CBC	FSCRYPT_MODE_AES_128_CBC
 #define FS_ENCRYPTION_MODE_AES_128_CTS	FSCRYPT_MODE_AES_128_CTS
-#define FS_ENCRYPTION_MODE_SPECK128_256_XTS	7	/* removed */
-#define FS_ENCRYPTION_MODE_SPECK128_256_CTS	8	/* removed */
 #define FS_ENCRYPTION_MODE_ADIANTUM	FSCRYPT_MODE_ADIANTUM
 #define FS_KEY_DESC_PREFIX		FSCRYPT_KEY_DESC_PREFIX
 #define FS_KEY_DESC_PREFIX_SIZE		FSCRYPT_KEY_DESC_PREFIX_SIZE

mm/highmem.c

@@ -564,7 +564,7 @@ void *__kmap_local_page_prot(struct page *page, pgprot_t prot)
 }
 EXPORT_SYMBOL(__kmap_local_page_prot);
 
-void kunmap_local_indexed(void *vaddr)
+void kunmap_local_indexed(const void *vaddr)
 {
 	unsigned long addr = (unsigned long) vaddr & PAGE_MASK;
 	pte_t *kmap_pte;