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authorLinus Torvalds <torvalds@linux-foundation.org>2021-08-31 10:01:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-08-31 10:01:14 -0700
commitcd358208d703fca446b52f3cf8f23c18f9e7705e (patch)
treec3a7930959a5a28fac428d09adfe5912bc2a7e51
parent87045e6546078dae215d1bd3b2bc82b3ada3ca77 (diff)
parent38ef66b05cfa3560323344a0b3e09e583f1eb974 (diff)
Merge tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
Pull fscrypt updates from Eric Biggers: "Some small fixes and cleanups for fs/crypto/: - Fix ->getattr() for ext4, f2fs, and ubifs to report the correct st_size for encrypted symlinks - Use base64url instead of a custom Base64 variant - Document struct fscrypt_operations" * tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt: fscrypt: document struct fscrypt_operations fscrypt: align Base64 encoding with RFC 4648 base64url fscrypt: remove mention of symlink st_size quirk from documentation ubifs: report correct st_size for encrypted symlinks f2fs: report correct st_size for encrypted symlinks ext4: report correct st_size for encrypted symlinks fscrypt: add fscrypt_symlink_getattr() for computing st_size
-rw-r--r--Documentation/filesystems/fscrypt.rst15
-rw-r--r--fs/crypto/fname.c106
-rw-r--r--fs/crypto/hooks.c44
-rw-r--r--fs/ext4/symlink.c12
-rw-r--r--fs/f2fs/namei.c12
-rw-r--r--fs/ubifs/file.c13
-rw-r--r--include/linux/fscrypt.h116
7 files changed, 260 insertions, 58 deletions
diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst
index 44b67ebd6e40..0eb799d9d05a 100644
--- a/Documentation/filesystems/fscrypt.rst
+++ b/Documentation/filesystems/fscrypt.rst
@@ -1063,11 +1063,6 @@ astute users may notice some differences in behavior:
- DAX (Direct Access) is not supported on encrypted files.
-- The st_size of an encrypted symlink will not necessarily give the
- length of the symlink target as required by POSIX. It will actually
- give the length of the ciphertext, which will be slightly longer
- than the plaintext due to NUL-padding and an extra 2-byte overhead.
-
- The maximum length of an encrypted symlink is 2 bytes shorter than
the maximum length of an unencrypted symlink. For example, on an
EXT4 filesystem with a 4K block size, unencrypted symlinks can be up
@@ -1235,12 +1230,12 @@ the user-supplied name to get the ciphertext.
Lookups without the key are more complicated. The raw ciphertext may
contain the ``\0`` and ``/`` characters, which are illegal in
-filenames. Therefore, readdir() must base64-encode the ciphertext for
-presentation. For most filenames, this works fine; on ->lookup(), the
-filesystem just base64-decodes the user-supplied name to get back to
-the raw ciphertext.
+filenames. Therefore, readdir() must base64url-encode the ciphertext
+for presentation. For most filenames, this works fine; on ->lookup(),
+the filesystem just base64url-decodes the user-supplied name to get
+back to the raw ciphertext.
-However, for very long filenames, base64 encoding would cause the
+However, for very long filenames, base64url encoding would cause the
filename length to exceed NAME_MAX. To prevent this, readdir()
actually presents long filenames in an abbreviated form which encodes
a strong "hash" of the ciphertext filename, along with the optional
diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
index d00455440d08..eb538c28df94 100644
--- a/fs/crypto/fname.c
+++ b/fs/crypto/fname.c
@@ -26,7 +26,7 @@
* it to find the directory entry again if requested. Naively, that would just
* mean using the ciphertext filenames. However, since the ciphertext filenames
* can contain illegal characters ('\0' and '/'), they must be encoded in some
- * way. We use base64. But that can cause names to exceed NAME_MAX (255
+ * way. We use base64url. But that can cause names to exceed NAME_MAX (255
* bytes), so we also need to use a strong hash to abbreviate long names.
*
* The filesystem may also need another kind of hash, the "dirhash", to quickly
@@ -38,7 +38,7 @@
* casefolded directories use this type of dirhash. At least in these cases,
* each no-key name must include the name's dirhash too.
*
- * To meet all these requirements, we base64-encode the following
+ * To meet all these requirements, we base64url-encode the following
* variable-length structure. It contains the dirhash, or 0's if the filesystem
* didn't provide one; up to 149 bytes of the ciphertext name; and for
* ciphertexts longer than 149 bytes, also the SHA-256 of the remaining bytes.
@@ -52,15 +52,19 @@ struct fscrypt_nokey_name {
u32 dirhash[2];
u8 bytes[149];
u8 sha256[SHA256_DIGEST_SIZE];
-}; /* 189 bytes => 252 bytes base64-encoded, which is <= NAME_MAX (255) */
+}; /* 189 bytes => 252 bytes base64url-encoded, which is <= NAME_MAX (255) */
/*
- * Decoded size of max-size nokey name, i.e. a name that was abbreviated using
+ * Decoded size of max-size no-key name, i.e. a name that was abbreviated using
* the strong hash and thus includes the 'sha256' field. This isn't simply
* sizeof(struct fscrypt_nokey_name), as the padding at the end isn't included.
*/
#define FSCRYPT_NOKEY_NAME_MAX offsetofend(struct fscrypt_nokey_name, sha256)
+/* Encoded size of max-size no-key name */
+#define FSCRYPT_NOKEY_NAME_MAX_ENCODED \
+ FSCRYPT_BASE64URL_CHARS(FSCRYPT_NOKEY_NAME_MAX)
+
static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
{
if (str->len == 1 && str->name[0] == '.')
@@ -175,62 +179,82 @@ static int fname_decrypt(const struct inode *inode,
return 0;
}
-static const char lookup_table[65] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
+static const char base64url_table[65] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
-#define BASE64_CHARS(nbytes) DIV_ROUND_UP((nbytes) * 4, 3)
+#define FSCRYPT_BASE64URL_CHARS(nbytes) DIV_ROUND_UP((nbytes) * 4, 3)
/**
- * base64_encode() - base64-encode some bytes
- * @src: the bytes to encode
- * @len: number of bytes to encode
- * @dst: (output) the base64-encoded string. Not NUL-terminated.
+ * fscrypt_base64url_encode() - base64url-encode some binary data
+ * @src: the binary data to encode
+ * @srclen: the length of @src in bytes
+ * @dst: (output) the base64url-encoded string. Not NUL-terminated.
*
- * Encodes the input string using characters from the set [A-Za-z0-9+,].
- * The encoded string is roughly 4/3 times the size of the input string.
+ * Encodes data using base64url encoding, i.e. the "Base 64 Encoding with URL
+ * and Filename Safe Alphabet" specified by RFC 4648. '='-padding isn't used,
+ * as it's unneeded and not required by the RFC. base64url is used instead of
+ * base64 to avoid the '/' character, which isn't allowed in filenames.
*
- * Return: length of the encoded string
+ * Return: the length of the resulting base64url-encoded string in bytes.
+ * This will be equal to FSCRYPT_BASE64URL_CHARS(srclen).
*/
-static int base64_encode(const u8 *src, int len, char *dst)
+static int fscrypt_base64url_encode(const u8 *src, int srclen, char *dst)
{
- int i, bits = 0, ac = 0;
+ u32 ac = 0;
+ int bits = 0;
+ int i;
char *cp = dst;
- for (i = 0; i < len; i++) {
- ac += src[i] << bits;
+ for (i = 0; i < srclen; i++) {
+ ac = (ac << 8) | src[i];
bits += 8;
do {
- *cp++ = lookup_table[ac & 0x3f];
- ac >>= 6;
bits -= 6;
+ *cp++ = base64url_table[(ac >> bits) & 0x3f];
} while (bits >= 6);
}
if (bits)
- *cp++ = lookup_table[ac & 0x3f];
+ *cp++ = base64url_table[(ac << (6 - bits)) & 0x3f];
return cp - dst;
}
-static int base64_decode(const char *src, int len, u8 *dst)
+/**
+ * fscrypt_base64url_decode() - base64url-decode a string
+ * @src: the string to decode. Doesn't need to be NUL-terminated.
+ * @srclen: the length of @src in bytes
+ * @dst: (output) the decoded binary data
+ *
+ * Decodes a string using base64url encoding, i.e. the "Base 64 Encoding with
+ * URL and Filename Safe Alphabet" specified by RFC 4648. '='-padding isn't
+ * accepted, nor are non-encoding characters such as whitespace.
+ *
+ * This implementation hasn't been optimized for performance.
+ *
+ * Return: the length of the resulting decoded binary data in bytes,
+ * or -1 if the string isn't a valid base64url string.
+ */
+static int fscrypt_base64url_decode(const char *src, int srclen, u8 *dst)
{
- int i, bits = 0, ac = 0;
- const char *p;
- u8 *cp = dst;
+ u32 ac = 0;
+ int bits = 0;
+ int i;
+ u8 *bp = dst;
+
+ for (i = 0; i < srclen; i++) {
+ const char *p = strchr(base64url_table, src[i]);
- for (i = 0; i < len; i++) {
- p = strchr(lookup_table, src[i]);
if (p == NULL || src[i] == 0)
- return -2;
- ac += (p - lookup_table) << bits;
+ return -1;
+ ac = (ac << 6) | (p - base64url_table);
bits += 6;
if (bits >= 8) {
- *cp++ = ac & 0xff;
- ac >>= 8;
bits -= 8;
+ *bp++ = (u8)(ac >> bits);
}
}
- if (ac)
+ if (ac & ((1 << bits) - 1))
return -1;
- return cp - dst;
+ return bp - dst;
}
bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
@@ -263,10 +287,8 @@ bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
int fscrypt_fname_alloc_buffer(u32 max_encrypted_len,
struct fscrypt_str *crypto_str)
{
- const u32 max_encoded_len = BASE64_CHARS(FSCRYPT_NOKEY_NAME_MAX);
- u32 max_presented_len;
-
- max_presented_len = max(max_encoded_len, max_encrypted_len);
+ u32 max_presented_len = max_t(u32, FSCRYPT_NOKEY_NAME_MAX_ENCODED,
+ max_encrypted_len);
crypto_str->name = kmalloc(max_presented_len + 1, GFP_NOFS);
if (!crypto_str->name)
@@ -342,7 +364,7 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode,
offsetof(struct fscrypt_nokey_name, bytes));
BUILD_BUG_ON(offsetofend(struct fscrypt_nokey_name, bytes) !=
offsetof(struct fscrypt_nokey_name, sha256));
- BUILD_BUG_ON(BASE64_CHARS(FSCRYPT_NOKEY_NAME_MAX) > NAME_MAX);
+ BUILD_BUG_ON(FSCRYPT_NOKEY_NAME_MAX_ENCODED > NAME_MAX);
nokey_name.dirhash[0] = hash;
nokey_name.dirhash[1] = minor_hash;
@@ -358,7 +380,8 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode,
nokey_name.sha256);
size = FSCRYPT_NOKEY_NAME_MAX;
}
- oname->len = base64_encode((const u8 *)&nokey_name, size, oname->name);
+ oname->len = fscrypt_base64url_encode((const u8 *)&nokey_name, size,
+ oname->name);
return 0;
}
EXPORT_SYMBOL(fscrypt_fname_disk_to_usr);
@@ -432,14 +455,15 @@ int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname,
* user-supplied name
*/
- if (iname->len > BASE64_CHARS(FSCRYPT_NOKEY_NAME_MAX))
+ if (iname->len > FSCRYPT_NOKEY_NAME_MAX_ENCODED)
return -ENOENT;
fname->crypto_buf.name = kmalloc(FSCRYPT_NOKEY_NAME_MAX, GFP_KERNEL);
if (fname->crypto_buf.name == NULL)
return -ENOMEM;
- ret = base64_decode(iname->name, iname->len, fname->crypto_buf.name);
+ ret = fscrypt_base64url_decode(iname->name, iname->len,
+ fname->crypto_buf.name);
if (ret < (int)offsetof(struct fscrypt_nokey_name, bytes[1]) ||
(ret > offsetof(struct fscrypt_nokey_name, sha256) &&
ret != FSCRYPT_NOKEY_NAME_MAX)) {
diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
index a73b0376e6f3..af74599ae1cf 100644
--- a/fs/crypto/hooks.c
+++ b/fs/crypto/hooks.c
@@ -384,3 +384,47 @@ err_kfree:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(fscrypt_get_symlink);
+
+/**
+ * fscrypt_symlink_getattr() - set the correct st_size for encrypted symlinks
+ * @path: the path for the encrypted symlink being queried
+ * @stat: the struct being filled with the symlink's attributes
+ *
+ * Override st_size of encrypted symlinks to be the length of the decrypted
+ * symlink target (or the no-key encoded symlink target, if the key is
+ * unavailable) rather than the length of the encrypted symlink target. This is
+ * necessary for st_size to match the symlink target that userspace actually
+ * sees. POSIX requires this, and some userspace programs depend on it.
+ *
+ * This requires reading the symlink target from disk if needed, setting up the
+ * inode's encryption key if possible, and then decrypting or encoding the
+ * symlink target. This makes lstat() more heavyweight than is normally the
+ * case. However, decrypted symlink targets will be cached in ->i_link, so
+ * usually the symlink won't have to be read and decrypted again later if/when
+ * it is actually followed, readlink() is called, or lstat() is called again.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int fscrypt_symlink_getattr(const struct path *path, struct kstat *stat)
+{
+ struct dentry *dentry = path->dentry;
+ struct inode *inode = d_inode(dentry);
+ const char *link;
+ DEFINE_DELAYED_CALL(done);
+
+ /*
+ * To get the symlink target that userspace will see (whether it's the
+ * decrypted target or the no-key encoded target), we can just get it in
+ * the same way the VFS does during path resolution and readlink().
+ */
+ link = READ_ONCE(inode->i_link);
+ if (!link) {
+ link = inode->i_op->get_link(dentry, inode, &done);
+ if (IS_ERR(link))
+ return PTR_ERR(link);
+ }
+ stat->size = strlen(link);
+ do_delayed_call(&done);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fscrypt_symlink_getattr);
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index dd05af983092..69109746e6e2 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -52,10 +52,20 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry,
return paddr;
}
+static int ext4_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
+ const struct path *path,
+ struct kstat *stat, u32 request_mask,
+ unsigned int query_flags)
+{
+ ext4_getattr(mnt_userns, path, stat, request_mask, query_flags);
+
+ return fscrypt_symlink_getattr(path, stat);
+}
+
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
- .getattr = ext4_getattr,
+ .getattr = ext4_encrypted_symlink_getattr,
.listxattr = ext4_listxattr,
};
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index e149c8c66a71..9c528e583c9d 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -1323,9 +1323,19 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
return target;
}
+static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
+ const struct path *path,
+ struct kstat *stat, u32 request_mask,
+ unsigned int query_flags)
+{
+ f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags);
+
+ return fscrypt_symlink_getattr(path, stat);
+}
+
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
.get_link = f2fs_encrypted_get_link,
- .getattr = f2fs_getattr,
+ .getattr = f2fs_encrypted_symlink_getattr,
.setattr = f2fs_setattr,
.listxattr = f2fs_listxattr,
};
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 2e4e1d159969..5cfa28cd00cd 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1630,6 +1630,17 @@ static const char *ubifs_get_link(struct dentry *dentry,
return fscrypt_get_symlink(inode, ui->data, ui->data_len, done);
}
+static int ubifs_symlink_getattr(struct user_namespace *mnt_userns,
+ const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags)
+{
+ ubifs_getattr(mnt_userns, path, stat, request_mask, query_flags);
+
+ if (IS_ENCRYPTED(d_inode(path->dentry)))
+ return fscrypt_symlink_getattr(path, stat);
+ return 0;
+}
+
const struct address_space_operations ubifs_file_address_operations = {
.readpage = ubifs_readpage,
.writepage = ubifs_writepage,
@@ -1655,7 +1666,7 @@ const struct inode_operations ubifs_file_inode_operations = {
const struct inode_operations ubifs_symlink_inode_operations = {
.get_link = ubifs_get_link,
.setattr = ubifs_setattr,
- .getattr = ubifs_getattr,
+ .getattr = ubifs_symlink_getattr,
.listxattr = ubifs_listxattr,
.update_time = ubifs_update_time,
};
diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index 2ea1387bb497..e912ed9141d9 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -47,27 +47,128 @@ struct fscrypt_name {
#define FSCRYPT_SET_CONTEXT_MAX_SIZE 40
#ifdef CONFIG_FS_ENCRYPTION
+
/*
- * fscrypt superblock flags
+ * If set, the fscrypt bounce page pool won't be allocated (unless another
+ * filesystem needs it). Set this if the filesystem always uses its own bounce
+ * pages for writes and therefore won't need the fscrypt bounce page pool.
*/
#define FS_CFLG_OWN_PAGES (1U << 1)
-/*
- * crypto operations for filesystems
- */
+/* Crypto operations for filesystems */
struct fscrypt_operations {
+
+ /* Set of optional flags; see above for allowed flags */
unsigned int flags;
+
+ /*
+ * If set, this is a filesystem-specific key description prefix that
+ * will be accepted for "logon" keys for v1 fscrypt policies, in
+ * addition to the generic prefix "fscrypt:". This functionality is
+ * deprecated, so new filesystems shouldn't set this field.
+ */
const char *key_prefix;
+
+ /*
+ * Get the fscrypt context of the given inode.
+ *
+ * @inode: the inode whose context to get
+ * @ctx: the buffer into which to get the context
+ * @len: length of the @ctx buffer in bytes
+ *
+ * Return: On success, returns the length of the context in bytes; this
+ * may be less than @len. On failure, returns -ENODATA if the
+ * inode doesn't have a context, -ERANGE if the context is
+ * longer than @len, or another -errno code.
+ */
int (*get_context)(struct inode *inode, void *ctx, size_t len);
+
+ /*
+ * Set an fscrypt context on the given inode.
+ *
+ * @inode: the inode whose context to set. The inode won't already have
+ * an fscrypt context.
+ * @ctx: the context to set
+ * @len: length of @ctx in bytes (at most FSCRYPT_SET_CONTEXT_MAX_SIZE)
+ * @fs_data: If called from fscrypt_set_context(), this will be the
+ * value the filesystem passed to fscrypt_set_context().
+ * Otherwise (i.e. when called from
+ * FS_IOC_SET_ENCRYPTION_POLICY) this will be NULL.
+ *
+ * i_rwsem will be held for write.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
int (*set_context)(struct inode *inode, const void *ctx, size_t len,
void *fs_data);
+
+ /*
+ * Get the dummy fscrypt policy in use on the filesystem (if any).
+ *
+ * Filesystems only need to implement this function if they support the
+ * test_dummy_encryption mount option.
+ *
+ * Return: A pointer to the dummy fscrypt policy, if the filesystem is
+ * mounted with test_dummy_encryption; otherwise NULL.
+ */
const union fscrypt_policy *(*get_dummy_policy)(struct super_block *sb);
+
+ /*
+ * Check whether a directory is empty. i_rwsem will be held for write.
+ */
bool (*empty_dir)(struct inode *inode);
+
+ /* The filesystem's maximum ciphertext filename length, in bytes */
unsigned int max_namelen;
+
+ /*
+ * Check whether the filesystem's inode numbers and UUID are stable,
+ * meaning that they will never be changed even by offline operations
+ * such as filesystem shrinking and therefore can be used in the
+ * encryption without the possibility of files becoming unreadable.
+ *
+ * Filesystems only need to implement this function if they want to
+ * support the FSCRYPT_POLICY_FLAG_IV_INO_LBLK_{32,64} flags. These
+ * flags are designed to work around the limitations of UFS and eMMC
+ * inline crypto hardware, and they shouldn't be used in scenarios where
+ * such hardware isn't being used.
+ *
+ * Leaving this NULL is equivalent to always returning false.
+ */
bool (*has_stable_inodes)(struct super_block *sb);
+
+ /*
+ * Get the number of bits that the filesystem uses to represent inode
+ * numbers and file logical block numbers.
+ *
+ * By default, both of these are assumed to be 64-bit. This function
+ * can be implemented to declare that either or both of these numbers is
+ * shorter, which may allow the use of the
+ * FSCRYPT_POLICY_FLAG_IV_INO_LBLK_{32,64} flags and/or the use of
+ * inline crypto hardware whose maximum DUN length is less than 64 bits
+ * (e.g., eMMC v5.2 spec compliant hardware). This function only needs
+ * to be implemented if support for one of these features is needed.
+ */
void (*get_ino_and_lblk_bits)(struct super_block *sb,
int *ino_bits_ret, int *lblk_bits_ret);
+
+ /*
+ * Return the number of block devices to which the filesystem may write
+ * encrypted file contents.
+ *
+ * If the filesystem can use multiple block devices (other than block
+ * devices that aren't used for encrypted file contents, such as
+ * external journal devices), and wants to support inline encryption,
+ * then it must implement this function. Otherwise it's not needed.
+ */
int (*get_num_devices)(struct super_block *sb);
+
+ /*
+ * If ->get_num_devices() returns a value greater than 1, then this
+ * function is called to get the array of request_queues that the
+ * filesystem is using -- one per block device. (There may be duplicate
+ * entries in this array, as block devices can share a request_queue.)
+ */
void (*get_devices)(struct super_block *sb,
struct request_queue **devs);
};
@@ -253,6 +354,7 @@ int __fscrypt_encrypt_symlink(struct inode *inode, const char *target,
const char *fscrypt_get_symlink(struct inode *inode, const void *caddr,
unsigned int max_size,
struct delayed_call *done);
+int fscrypt_symlink_getattr(const struct path *path, struct kstat *stat);
static inline void fscrypt_set_ops(struct super_block *sb,
const struct fscrypt_operations *s_cop)
{
@@ -583,6 +685,12 @@ static inline const char *fscrypt_get_symlink(struct inode *inode,
return ERR_PTR(-EOPNOTSUPP);
}
+static inline int fscrypt_symlink_getattr(const struct path *path,
+ struct kstat *stat)
+{
+ return -EOPNOTSUPP;
+}
+
static inline void fscrypt_set_ops(struct super_block *sb,
const struct fscrypt_operations *s_cop)
{

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