[PATCH v3 13/13] fs: drop i_verity_info from struct inode

Christian Brauner
2025-07-22T19:28:31Z

Now that all filesystems store the fsverity data pointer in their
private inode, drop the data pointer from struct inode itself freeing up
8 bytes.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
fs/verity/enable.c | 2 +-
fs/verity/fsverity_private.h | 2 +-
fs/verity/open.c | 19 +++++--------------
include/linux/fs.h | 4 ----
include/linux/fsverity.h | 14 +++++++-------
5 files changed, 14 insertions(+), 27 deletions(-)

diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index c284f46d1b53..255cf73f6c03 100644
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -287,7 +287,7 @@ static int enable_verity(struct file *filp,
/* Successfully enabled verity */

/*
- * Readers can start using ->i_verity_info immediately, so it
+ * Readers can start using ->i_fsverity_info immediately, so it
* can't be rolled back once set. So don't set it until just
* after the filesystem has successfully enabled verity.
*/
diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h
index b3506f56e180..358cbc3aa7ea 100644
--- a/fs/verity/fsverity_private.h
+++ b/fs/verity/fsverity_private.h
@@ -58,7 +58,7 @@ struct merkle_tree_params {
* fsverity_info - cached verity metadata for an inode
*
* When a verity file is first opened, an instance of this struct is allocated
- * and stored in ->i_verity_info; it remains until the inode is evicted. It
+ * and stored in ->i_fsverity_info; it remains until the inode is evicted. It
* caches information about the Merkle tree that's needed to efficiently verify
* data read from the file. It also caches the file digest. The Merkle tree
* pages themselves are not cached here, but the filesystem may cache them.
diff --git a/fs/verity/open.c b/fs/verity/open.c
index 9368eeac6fb6..20c6020d59fa 100644
--- a/fs/verity/open.c
+++ b/fs/verity/open.c
@@ -250,24 +250,17 @@ struct fsverity_info *fsverity_create_info(const struct inode *inode,

void fsverity_set_info(struct inode *inode, struct fsverity_info *vi)
{
- void *p;
-
/*
- * Multiple tasks may race to set ->i_verity_info, so use
+ * Multiple tasks may race to set ->i_fsverity_info, so use
* cmpxchg_release(). This pairs with the smp_load_acquire() in
- * fsverity_get_info(). I.e., here we publish ->i_verity_info with a
+ * fsverity_get_info(). I.e., here we publish ->i_fsverity_info with a
* RELEASE barrier so that other tasks can ACQUIRE it.
*/
-
- if (inode->i_sb->s_op->i_fsverity)
- p = cmpxchg_release(fsverity_addr(inode), NULL, vi);
- else
- p = cmpxchg_release(&inode->i_verity_info, NULL, vi);
- if (p != NULL) {
+ if (cmpxchg_release(fsverity_addr(inode), NULL, vi) != NULL) {
/* Lost the race, so free the fsverity_info we allocated. */
fsverity_free_info(vi);
/*
- * Afterwards, the caller may access ->i_verity_info directly,
+ * Afterwards, the caller may access ->i_fsverity_info directly,
* so make sure to ACQUIRE the winning fsverity_info.
*/
(void)fsverity_get_info(inode);
@@ -364,7 +357,7 @@ int fsverity_get_descriptor(struct inode *inode,
return 0;
}

-/* Ensure the inode has an ->i_verity_info */
+/* Ensure the inode has an ->i_fsverity_info */
static int ensure_verity_info(struct inode *inode)
{
struct fsverity_info *vi = fsverity_get_info(inode);
@@ -412,8 +405,6 @@ void __fsverity_cleanup_inode(struct inode *inode)
struct fsverity_info **vi;

vi = fsverity_addr(inode);
- if (!*vi)
- vi = &inode->i_verity_info;
fsverity_free_info(*vi);
*vi = NULL;
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index f7acf17550f1..a9031a937959 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -778,10 +778,6 @@ struct inode {
struct fsnotify_mark_connector __rcu *i_fsnotify_marks;
#endif

-#ifdef CONFIG_FS_VERITY
- struct fsverity_info *i_verity_info;
-#endif
-
void *i_private; /* fs or device private pointer */
} __randomize_layout;

diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index 341cb1ec73f8..7c876d149a63 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -133,13 +133,13 @@ static inline struct fsverity_info *fsverity_get_info(const struct inode *inode)
{
/*
* Pairs with the cmpxchg_release() in fsverity_set_info().
- * I.e., another task may publish ->i_verity_info concurrently,
+ * I.e., another task may publish ->i_fsverity_info concurrently,
* executing a RELEASE barrier. We need to use smp_load_acquire() here
* to safely ACQUIRE the memory the other task published.
*/
if (inode->i_sb->s_op->i_fsverity)
return smp_load_acquire(fsverity_addr(inode));
- return smp_load_acquire(&inode->i_verity_info);
+ return NULL;
}

/* enable.c */
@@ -163,11 +163,11 @@ void __fsverity_cleanup_inode(struct inode *inode);
* fsverity_cleanup_inode() - free the inode's verity info, if present
* @inode: an inode being evicted
*
- * Filesystems must call this on inode eviction to free ->i_verity_info.
+ * Filesystems must call this on inode eviction to free ->i_fsverity_info.
*/
static inline void fsverity_cleanup_inode(struct inode *inode)
{
- if (inode->i_verity_info || inode->i_sb->s_op->i_fsverity)
+ if (inode->i_sb->s_op->i_fsverity)
__fsverity_cleanup_inode(inode);
}

@@ -274,12 +274,12 @@ static inline bool fsverity_verify_page(struct page *page)
* fsverity_active() - do reads from the inode need to go through fs-verity?
* @inode: inode to check
*
- * This checks whether ->i_verity_info has been set.
+ * This checks whether ->i_fsverity_info has been set.
*
* Filesystems call this from ->readahead() to check whether the pages need to
* be verified or not. Don't use IS_VERITY() for this purpose; it's subject to
* a race condition where the file is being read concurrently with
- * FS_IOC_ENABLE_VERITY completing. (S_VERITY is set before ->i_verity_info.)
+ * FS_IOC_ENABLE_VERITY completing. (S_VERITY is set before ->i_fsverity_info.)
*
* Return: true if reads need to go through fs-verity, otherwise false
*/
@@ -294,7 +294,7 @@ static inline bool fsverity_active(const struct inode *inode)
* @filp: the struct file being set up
*
* When opening a verity file, deny the open if it is for writing. Otherwise,
- * set up the inode's ->i_verity_info if not already done.
+ * set up the inode's ->i_fsverity_info if not already done.
*
* When combined with fscrypt, this must be called after fscrypt_file_open().
* Otherwise, we won't have the key set up to decrypt the verity metadata.

--
2.47.2