[PATCH 7/7] fsverity: Remove filesystem specific build config option

[Chandan Rajendra <chandan@linux.vnet.ibm.com>]

In order to have a common code base for fsverity "post read" processing
for all filesystems which support per-file verity, this commit removes
filesystem specific build config option (e.g. CONFIG_EXT4_FS_VERITY) and
replaces it with a build option (i.e. CONFIG_FS_VERITY) whose value
affects all the filesystems making use of fsverity.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
 fs/ext4/Kconfig          | 20 --------------------
 fs/ext4/ext4.h           |  2 --
 fs/ext4/readpage.c       |  4 ++--
 fs/ext4/super.c          |  6 +++---
 fs/ext4/sysfs.c          |  4 ++--
 fs/f2fs/Kconfig          | 20 --------------------
 fs/f2fs/data.c           |  2 +-
 fs/f2fs/f2fs.h           |  2 --
 fs/f2fs/super.c          |  6 +++---
 fs/f2fs/sysfs.c          |  4 ++--
 fs/verity/Kconfig        |  2 +-
 include/linux/fsverity.h |  3 +--
 12 files changed, 15 insertions(+), 60 deletions(-)

diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index e1002bbf35bf..031e5a82d556 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -96,26 +96,6 @@ config EXT4_FS_SECURITY
 	  If you are not using a security module that requires using
 	  extended attributes for file security labels, say N.
 
-config EXT4_FS_VERITY
-	bool "Ext4 Verity"
-	depends on EXT4_FS
-	select FS_VERITY
-	help
-	  This option enables fs-verity for ext4.  fs-verity is the
-	  dm-verity mechanism implemented at the file level.  Userspace
-	  can append a Merkle tree (hash tree) to a file, then enable
-	  fs-verity on the file.  ext4 will then transparently verify
-	  any data read from the file against the Merkle tree.  The file
-	  is also made read-only.
-
-	  This serves as an integrity check, but the availability of the
-	  Merkle tree root hash also allows efficiently supporting
-	  various use cases where normally the whole file would need to
-	  be hashed at once, such as auditing and authenticity
-	  verification (appraisal).
-
-	  If unsure, say N.
-
 config EXT4_DEBUG
 	bool "EXT4 debugging support"
 	depends on EXT4_FS
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 64bf9fb7ef18..bff8d639dd0c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -41,8 +41,6 @@
 #endif
 
 #include <linux/fscrypt.h>
-
-#define __FS_HAS_VERITY IS_ENABLED(CONFIG_EXT4_FS_VERITY)
 #include <linux/fsverity.h>
 
 #include <linux/compiler.h>
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 2c037df629dd..8717ac0a5bb2 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -158,7 +158,7 @@ static struct bio_post_read_ctx *get_bio_post_read_ctx(struct inode *inode,
 
 	if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode))
 		post_read_steps |= 1 << STEP_DECRYPT;
-#ifdef CONFIG_EXT4_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	if (inode->i_verity_info != NULL &&
 	    (index < ((i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT)))
 		post_read_steps |= 1 << STEP_VERITY;
@@ -205,7 +205,7 @@ static void mpage_end_io(struct bio *bio)
 
 static inline loff_t ext4_readpage_limit(struct inode *inode)
 {
-#ifdef CONFIG_EXT4_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	if (IS_VERITY(inode)) {
 		if (inode->i_verity_info)
 			/* limit to end of metadata region */
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 16fb483a6f4a..472338c7cd03 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1316,7 +1316,7 @@ static const struct fscrypt_operations ext4_cryptops = {
 };
 #endif
 
-#ifdef CONFIG_EXT4_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 static int ext4_set_verity(struct inode *inode, loff_t data_i_size)
 {
 	int err;
@@ -1401,7 +1401,7 @@ static const struct fsverity_operations ext4_verityops = {
 	.set_verity		= ext4_set_verity,
 	.get_metadata_end	= ext4_get_metadata_end,
 };
-#endif /* CONFIG_EXT4_FS_VERITY */
+#endif /* CONFIG_FS_VERITY */
 
 #ifdef CONFIG_QUOTA
 static const char * const quotatypes[] = INITQFNAMES;
@@ -4234,7 +4234,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 #ifdef CONFIG_FS_ENCRYPTION
 	sb->s_cop = &ext4_cryptops;
 #endif
-#ifdef CONFIG_EXT4_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	sb->s_vop = &ext4_verityops;
 #endif
 #ifdef CONFIG_QUOTA
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 8bc915452a38..6fa0f47c3180 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -227,7 +227,7 @@ EXT4_ATTR_FEATURE(meta_bg_resize);
 #ifdef CONFIG_FS_ENCRYPTION
 EXT4_ATTR_FEATURE(encryption);
 #endif
-#ifdef CONFIG_EXT4_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 EXT4_ATTR_FEATURE(verity);
 #endif
 EXT4_ATTR_FEATURE(metadata_csum_seed);
@@ -239,7 +239,7 @@ static struct attribute *ext4_feat_attrs[] = {
 #ifdef CONFIG_FS_ENCRYPTION
 	ATTR_LIST(encryption),
 #endif
-#ifdef CONFIG_EXT4_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	ATTR_LIST(verity),
 #endif
 	ATTR_LIST(metadata_csum_seed),
diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
index ce60e480fec1..708e23816575 100644
--- a/fs/f2fs/Kconfig
+++ b/fs/f2fs/Kconfig
@@ -70,26 +70,6 @@ config F2FS_CHECK_FS
 
 	  If you want to improve the performance, say N.
 
-config F2FS_FS_VERITY
-	bool "F2FS Verity"
-	depends on F2FS_FS
-	select FS_VERITY
-	help
-	  This option enables fs-verity for f2fs.  fs-verity is the
-	  dm-verity mechanism implemented at the file level.  Userspace
-	  can append a Merkle tree (hash tree) to a file, then enable
-	  fs-verity on the file.  f2fs will then transparently verify
-	  any data read from the file against the Merkle tree.  The file
-	  is also made read-only.
-
-	  This serves as an integrity check, but the availability of the
-	  Merkle tree root hash also allows efficiently supporting
-	  various use cases where normally the whole file would need to
-	  be hashed at once, such as auditing and authenticity
-	  verification (appraisal).
-
-	  If unsure, say N.
-
 config F2FS_IO_TRACE
 	bool "F2FS IO tracer"
 	depends on F2FS_FS
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 844ec573263e..83b59b985894 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -610,7 +610,7 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
 
 	if (f2fs_encrypted_file(inode))
 		post_read_steps |= 1 << STEP_DECRYPT;
-#ifdef CONFIG_F2FS_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	if (inode->i_verity_info != NULL &&
 	    (first_idx < ((i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT)))
 		post_read_steps |= 1 << STEP_VERITY;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ea8a5ffc4f1f..dc999af932f2 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -25,8 +25,6 @@
 #include <crypto/hash.h>
 
 #include <linux/fscrypt.h>
-
-#define __FS_HAS_VERITY IS_ENABLED(CONFIG_F2FS_FS_VERITY)
 #include <linux/fsverity.h>
 
 #ifdef CONFIG_F2FS_CHECK_FS
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 4287cf348d3c..60d5338280fb 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2197,7 +2197,7 @@ static const struct fscrypt_operations f2fs_cryptops = {
 };
 #endif
 
-#ifdef CONFIG_F2FS_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 static int f2fs_set_verity(struct inode *inode, loff_t data_i_size)
 {
 	int err;
@@ -2222,7 +2222,7 @@ static const struct fsverity_operations f2fs_verityops = {
 	.set_verity		= f2fs_set_verity,
 	.get_metadata_end	= f2fs_get_metadata_end,
 };
-#endif /* CONFIG_F2FS_FS_VERITY */
+#endif /* CONFIG_FS_VERITY */
 
 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 		u64 ino, u32 generation)
@@ -3146,7 +3146,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 #ifdef CONFIG_FS_ENCRYPTION
 	sb->s_cop = &f2fs_cryptops;
 #endif
-#ifdef CONFIG_F2FS_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	sb->s_vop = &f2fs_verityops;
 #endif
 	sb->s_xattr = f2fs_xattr_handlers;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 737677655bc0..949e6d87f4e3 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -444,7 +444,7 @@ F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
 F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
 F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
 F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
-#ifdef CONFIG_F2FS_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 F2FS_FEATURE_RO_ATTR(verity, FEAT_VERITY);
 #endif
 F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
@@ -507,7 +507,7 @@ static struct attribute *f2fs_feat_attrs[] = {
 	ATTR_LIST(quota_ino),
 	ATTR_LIST(inode_crtime),
 	ATTR_LIST(lost_found),
-#ifdef CONFIG_F2FS_FS_VERITY
+#ifdef CONFIG_FS_VERITY
 	ATTR_LIST(verity),
 #endif
 	ATTR_LIST(sb_checksum),
diff --git a/fs/verity/Kconfig b/fs/verity/Kconfig
index a7470a2e4892..b5a48a9ef0ca 100644
--- a/fs/verity/Kconfig
+++ b/fs/verity/Kconfig
@@ -1,5 +1,5 @@
 config FS_VERITY
-	tristate "FS Verity (read-only file-based authenticity protection)"
+	bool "FS Verity (read-only file-based authenticity protection)"
 	select CRYPTO
 	# SHA-256 is selected as it's intended to be the default hash algorithm.
 	# To avoid bloat, other wanted algorithms must be selected explicitly.
diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index c30c4f6ed411..f37132c640ee 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -19,8 +19,7 @@ struct fsverity_operations {
 	int (*get_metadata_end)(struct inode *inode, loff_t *metadata_end_ret);
 };
 
-#if __FS_HAS_VERITY
-
+#ifdef CONFIG_FS_VERITY
 /* ioctl.c */
 extern int fsverity_ioctl_enable(struct file *filp, const void __user *arg);
 extern int fsverity_ioctl_measure(struct file *filp, void __user *arg);
-- 
2.19.1