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@@ -0,0 +1,72 @@
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+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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+From: Hauke Mehrtens <[email protected]>
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+Date: Sat, 25 Oct 2025 19:59:58 +0200
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+Subject: create_inode: Fix compilation again kernel < 5.12
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+
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+Copy the header definition from Linux kernel v5.12 to allow compilation
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+against kernel headers from an kernel older than v5.12.
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+
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+struct fsverity_descriptor was already added in kernel 5.11, compiling
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+against kernel 5.11 kernel headers could cause problems.
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+
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+Signed-off-by: Hauke Mehrtens <[email protected]>
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+---
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+ misc/create_inode.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
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+ 1 file changed, 47 insertions(+)
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+
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+--- a/misc/create_inode.c
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++++ b/misc/create_inode.c
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+@@ -575,6 +575,53 @@ static inline off_t round_up(off_t n, of
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+ return ((n - bias + (blksz - 1)) & ~(blksz - 1)) + bias;
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+ }
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+
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++#ifndef FS_IOC_READ_VERITY_METADATA
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++
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++/*
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++ * Struct containing a file's Merkle tree properties. The fs-verity file digest
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++ * is the hash of this struct. A userspace program needs this struct only if it
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++ * needs to compute fs-verity file digests itself, e.g. in order to sign files.
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++ * It isn't needed just to enable fs-verity on a file.
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++ *
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++ * Note: when computing the file digest, 'sig_size' and 'signature' must be left
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++ * zero and empty, respectively. These fields are present only because some
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++ * filesystems reuse this struct as part of their on-disk format.
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++ */
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++struct fsverity_descriptor {
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++ __u8 version; /* must be 1 */
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++ __u8 hash_algorithm; /* Merkle tree hash algorithm */
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++ __u8 log_blocksize; /* log2 of size of data and tree blocks */
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++ __u8 salt_size; /* size of salt in bytes; 0 if none */
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++#ifdef __KERNEL__
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++ __le32 sig_size;
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++#else
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++ __le32 __reserved_0x04; /* must be 0 */
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++#endif
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++ __le64 data_size; /* size of file the Merkle tree is built over */
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++ __u8 root_hash[64]; /* Merkle tree root hash */
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++ __u8 salt[32]; /* salt prepended to each hashed block */
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++ __u8 __reserved[144]; /* must be 0's */
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++#ifdef __KERNEL__
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++ __u8 signature[];
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++#endif
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++};
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++
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++#define FS_VERITY_METADATA_TYPE_MERKLE_TREE 1
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++#define FS_VERITY_METADATA_TYPE_DESCRIPTOR 2
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++#define FS_VERITY_METADATA_TYPE_SIGNATURE 3
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++
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++struct fsverity_read_metadata_arg {
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++ __u64 metadata_type;
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++ __u64 offset;
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++ __u64 length;
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++ __u64 buf_ptr;
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++ __u64 __reserved;
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++};
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++
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++#define FS_IOC_READ_VERITY_METADATA \
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++ _IOWR('f', 135, struct fsverity_read_metadata_arg)
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++#endif
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++
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+ static errcode_t copy_fs_verity_data(ext2_file_t e2_file, ext2_off_t e2_offset,
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+ int fd, uint64_t metadata_type,
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+ __u32 *written)
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Hauke Mehrtens