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Violators will be prosecuted for from ; Tue, 27 Nov 2018 13:29:11 -0000 From: Chandan Rajendra To: Eric Biggers Cc: linux-fscrypt@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, tytso@mit.edu Subject: Re: [PATCH 3/7] fscrypt: Remove filesystem specific build config option Date: Tue, 27 Nov 2018 18:59:11 +0530 In-Reply-To: <20181127001423.GB11663@gmail.com> References: <20181119052324.31456-1-chandan@linux.vnet.ibm.com> <20181119052324.31456-4-chandan@linux.vnet.ibm.com> <20181127001423.GB11663@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Message-Id: <17749201.TQgCI1PFOp@localhost.localdomain> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Tuesday, November 27, 2018 5:44:24 AM IST Eric Biggers wrote: > Hi Chandan, > > On Mon, Nov 19, 2018 at 10:53:20AM +0530, Chandan Rajendra wrote: > > In order to have a common code base for fscrypt "post read" processing > > for all filesystems which support encryption, this commit removes > > filesystem specific build config option (e.g. CONFIG_EXT4_FS_ENCRYPTION) > > and replaces it with a build option (i.e. CONFIG_FS_ENCRYPTION) whose > > value affects all the filesystems making use of fscrypt. > > > > Signed-off-by: Chandan Rajendra > > Can you grep for EXT4_ENCRYPTION? There are still some references left, one in > Documentation/filesystems/fscrypt.rst and some in defconfig files. > > Also in include/linux/fs.h, there are tests of > > #if IS_ENABLED(CONFIG_FS_ENCRYPTION) > > which after this change should be > > #ifdef CONFIG_FS_ENCRYPTION > > like is done elsewhere. Sorry, I had restricted my search to *.[ch] files and that too within linux/fs/ directory. I will fix the other occurrences as well. > > > --- > > fs/crypto/Kconfig | 2 +- > > fs/ext4/Kconfig | 15 -- > > fs/ext4/dir.c | 2 - > > fs/ext4/ext4.h | 7 +- > > fs/ext4/inode.c | 8 +- > > fs/ext4/ioctl.c | 4 +- > > fs/ext4/namei.c | 10 +- > > fs/ext4/page-io.c | 6 +- > > fs/ext4/readpage.c | 2 +- > > fs/ext4/super.c | 6 +- > > fs/ext4/sysfs.c | 4 +- > > fs/f2fs/Kconfig | 11 - > > fs/f2fs/f2fs.h | 7 +- > > fs/f2fs/super.c | 8 +- > > fs/f2fs/sysfs.c | 4 +- > > include/linux/fscrypt.h | 416 +++++++++++++++++++++++++++++++- > > include/linux/fscrypt_notsupp.h | 231 ------------------ > > include/linux/fscrypt_supp.h | 204 ---------------- > > 18 files changed, 441 insertions(+), 506 deletions(-) > > delete mode 100644 include/linux/fscrypt_notsupp.h > > delete mode 100644 include/linux/fscrypt_supp.h > > > > diff --git a/fs/crypto/Kconfig b/fs/crypto/Kconfig > > index 02b7d91c9231..6e9ae566a8fc 100644 > > --- a/fs/crypto/Kconfig > > +++ b/fs/crypto/Kconfig > > @@ -1,5 +1,5 @@ > > config FS_ENCRYPTION > > - tristate "FS Encryption (Per-file encryption)" > > + bool "FS Encryption (Per-file encryption)" > > select CRYPTO > > select CRYPTO_AES > > select CRYPTO_CBC > > diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig > > index 5a76125ac0f8..e1002bbf35bf 100644 > > --- a/fs/ext4/Kconfig > > +++ b/fs/ext4/Kconfig > > @@ -96,21 +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_ENCRYPTION > > - bool "Ext4 Encryption" > > - depends on EXT4_FS > > - select FS_ENCRYPTION > > - help > > - Enable encryption of ext4 files and directories. This > > - feature is similar to ecryptfs, but it is more memory > > - efficient since it avoids caching the encrypted and > > - decrypted pages in the page cache. > > - > > -config EXT4_FS_ENCRYPTION > > - bool > > - default y > > - depends on EXT4_ENCRYPTION > > - > > config EXT4_FS_VERITY > > bool "Ext4 Verity" > > depends on EXT4_FS > > diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c > > index fb7a64ea5679..0ccd51f72048 100644 > > --- a/fs/ext4/dir.c > > +++ b/fs/ext4/dir.c > > @@ -283,9 +283,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx) > > done: > > err = 0; > > errout: > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > fscrypt_fname_free_buffer(&fstr); > > -#endif > > brelse(bh); > > return err; > > } > > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h > > index 2ae6ab88f218..db21df885186 100644 > > --- a/fs/ext4/ext4.h > > +++ b/fs/ext4/ext4.h > > @@ -40,7 +40,6 @@ > > #include > > #endif > > > > -#define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_EXT4_FS_ENCRYPTION) > > #include > > > > #define __FS_HAS_VERITY IS_ENABLED(CONFIG_EXT4_FS_VERITY) > > @@ -1341,7 +1340,7 @@ struct ext4_super_block { > > #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ > > #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ > > EXT4_MF_TEST_DUMMY_ENCRYPTION)) > > #else > > @@ -2069,7 +2068,7 @@ struct ext4_filename { > > const struct qstr *usr_fname; > > struct fscrypt_str disk_name; > > struct dx_hash_info hinfo; > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > struct fscrypt_str crypto_buf; > > #endif > > }; > > @@ -2306,7 +2305,7 @@ static inline bool ext4_verity_inode(struct inode *inode) > > #endif > > } > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > static inline int ext4_fname_setup_filename(struct inode *dir, > > const struct qstr *iname, > > int lookup, struct ext4_filename *fname) > > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > > index 725777772f32..ae6794649817 100644 > > --- a/fs/ext4/inode.c > > +++ b/fs/ext4/inode.c > > @@ -1150,7 +1150,7 @@ int do_journal_get_write_access(handle_t *handle, > > return ret; > > } > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len, > > get_block_t *get_block) > > { > > @@ -1303,7 +1303,7 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping, > > /* In case writeback began while the page was unlocked */ > > wait_for_stable_page(page); > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > if (ext4_should_dioread_nolock(inode)) > > ret = ext4_block_write_begin(page, pos, len, > > ext4_get_block_unwritten); > > @@ -3104,7 +3104,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping, > > /* In case writeback began while the page was unlocked */ > > wait_for_stable_page(page); > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > ret = ext4_block_write_begin(page, pos, len, > > ext4_da_get_block_prep); > > #else > > @@ -3879,7 +3879,7 @@ static ssize_t ext4_direct_IO(struct kiocb *iocb, struct iov_iter *iter) > > loff_t offset = iocb->ki_pos; > > ssize_t ret; > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode)) > > return 0; > > #endif > > diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c > > index 9bb6cc1ae8ce..892fb1925836 100644 > > --- a/fs/ext4/ioctl.c > > +++ b/fs/ext4/ioctl.c > > @@ -210,7 +210,7 @@ static long swap_inode_boot_loader(struct super_block *sb, > > return err; > > } > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > static int uuid_is_zero(__u8 u[16]) > > { > > int i; > > @@ -978,7 +978,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > > return fscrypt_ioctl_set_policy(filp, (const void __user *)arg); > > > > case EXT4_IOC_GET_ENCRYPTION_PWSALT: { > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > int err, err2; > > struct ext4_sb_info *sbi = EXT4_SB(sb); > > handle_t *handle; > > diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c > > index 0de60207a963..1e1a3c8c3a8b 100644 > > --- a/fs/ext4/namei.c > > +++ b/fs/ext4/namei.c > > @@ -611,7 +611,7 @@ static struct stats dx_show_leaf(struct inode *dir, > > { > > if (show_names) > > { > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > int len; > > char *name; > > struct fscrypt_str fname_crypto_str = > > @@ -983,7 +983,7 @@ static int htree_dirblock_to_tree(struct file *dir_file, > > top = (struct ext4_dir_entry_2 *) ((char *) de + > > dir->i_sb->s_blocksize - > > EXT4_DIR_REC_LEN(0)); > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > /* Check if the directory is encrypted */ > > if (IS_ENCRYPTED(dir)) { > > err = fscrypt_get_encryption_info(dir); > > @@ -1046,7 +1046,7 @@ static int htree_dirblock_to_tree(struct file *dir_file, > > } > > errout: > > brelse(bh); > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > fscrypt_fname_free_buffer(&fname_crypto_str); > > #endif > > return count; > > @@ -1266,7 +1266,7 @@ static inline bool ext4_match(const struct ext4_filename *fname, > > > > f.usr_fname = fname->usr_fname; > > f.disk_name = fname->disk_name; > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > f.crypto_buf = fname->crypto_buf; > > #endif > > return fscrypt_match_name(&f, de->name, de->name_len); > > @@ -1497,7 +1497,7 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, > > ext4_lblk_t block; > > int retval; > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > *res_dir = NULL; > > #endif > > frame = dx_probe(fname, dir, NULL, frames); > > diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c > > index 008c20b58f98..7d5f12be07ab 100644 > > --- a/fs/ext4/page-io.c > > +++ b/fs/ext4/page-io.c > > @@ -66,7 +66,7 @@ static void ext4_finish_bio(struct bio *bio) > > > > bio_for_each_segment_all(bvec, bio, i) { > > struct page *page = bvec->bv_page; > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > struct page *data_page = NULL; > > #endif > > struct buffer_head *bh, *head; > > @@ -78,7 +78,7 @@ static void ext4_finish_bio(struct bio *bio) > > if (!page) > > continue; > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > if (!page->mapping) { > > /* The bounce data pages are unmapped. */ > > data_page = page; > > @@ -111,7 +111,7 @@ static void ext4_finish_bio(struct bio *bio) > > bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); > > local_irq_restore(flags); > > if (!under_io) { > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > if (data_page) > > fscrypt_restore_control_page(data_page); > > #endif > > diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c > > index 45e707fb9749..7252f0a60cdb 100644 > > --- a/fs/ext4/readpage.c > > +++ b/fs/ext4/readpage.c > > @@ -54,7 +54,7 @@ static mempool_t *bio_post_read_ctx_pool; > > > > static inline bool ext4_bio_encrypted(struct bio *bio) > > { > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > return unlikely(bio->bi_private != NULL); > > #else > > return false; > > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > > index fb4e060f28ec..16fb483a6f4a 100644 > > --- a/fs/ext4/super.c > > +++ b/fs/ext4/super.c > > @@ -1210,7 +1210,7 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page, > > return try_to_free_buffers(page); > > } > > > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > static int ext4_get_context(struct inode *inode, void *ctx, size_t len) > > { > > return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION, > > @@ -1986,7 +1986,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, > > *journal_ioprio = > > IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); > > } else if (token == Opt_test_dummy_encryption) { > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; > > ext4_msg(sb, KERN_WARNING, > > "Test dummy encryption mode enabled"); > > @@ -4231,7 +4231,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) > > sb->s_op = &ext4_sops; > > sb->s_export_op = &ext4_export_ops; > > sb->s_xattr = ext4_xattr_handlers; > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > sb->s_cop = &ext4_cryptops; > > #endif > > #ifdef CONFIG_EXT4_FS_VERITY > > diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c > > index 8e86087c2f03..8bc915452a38 100644 > > --- a/fs/ext4/sysfs.c > > +++ b/fs/ext4/sysfs.c > > @@ -224,7 +224,7 @@ static struct attribute *ext4_attrs[] = { > > EXT4_ATTR_FEATURE(lazy_itable_init); > > EXT4_ATTR_FEATURE(batched_discard); > > EXT4_ATTR_FEATURE(meta_bg_resize); > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > EXT4_ATTR_FEATURE(encryption); > > #endif > > #ifdef CONFIG_EXT4_FS_VERITY > > @@ -236,7 +236,7 @@ static struct attribute *ext4_feat_attrs[] = { > > ATTR_LIST(lazy_itable_init), > > ATTR_LIST(batched_discard), > > ATTR_LIST(meta_bg_resize), > > -#ifdef CONFIG_EXT4_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > ATTR_LIST(encryption), > > #endif > > #ifdef CONFIG_EXT4_FS_VERITY > > diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig > > index c8396c7220f2..ce60e480fec1 100644 > > --- a/fs/f2fs/Kconfig > > +++ b/fs/f2fs/Kconfig > > @@ -70,17 +70,6 @@ config F2FS_CHECK_FS > > > > If you want to improve the performance, say N. > > > > -config F2FS_FS_ENCRYPTION > > - bool "F2FS Encryption" > > - depends on F2FS_FS > > - depends on F2FS_FS_XATTR > > - select FS_ENCRYPTION > > - help > > - Enable encryption of f2fs files and directories. This > > - feature is similar to ecryptfs, but it is more memory > > - efficient since it avoids caching the encrypted and > > - decrypted pages in the page cache. > > - > > config F2FS_FS_VERITY > > bool "F2FS Verity" > > depends on F2FS_FS > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > index dadb5f468f20..ea8a5ffc4f1f 100644 > > --- a/fs/f2fs/f2fs.h > > +++ b/fs/f2fs/f2fs.h > > @@ -24,7 +24,6 @@ > > #include > > #include > > > > -#define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_F2FS_FS_ENCRYPTION) > > #include > > > > #define __FS_HAS_VERITY IS_ENABLED(CONFIG_F2FS_FS_VERITY) > > @@ -1145,7 +1144,7 @@ enum fsync_mode { > > FSYNC_MODE_NOBARRIER, /* fsync behaves nobarrier based on posix */ > > }; > > > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > #define DUMMY_ENCRYPTION_ENABLED(sbi) \ > > (unlikely(F2FS_OPTION(sbi).test_dummy_encryption)) > > #else > > @@ -3448,7 +3447,7 @@ static inline bool f2fs_encrypted_file(struct inode *inode) > > > > static inline void f2fs_set_encrypted_inode(struct inode *inode) > > { > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > file_set_encrypt(inode); > > f2fs_set_inode_flags(inode); > > #endif > > @@ -3533,7 +3532,7 @@ static inline void set_opt_mode(struct f2fs_sb_info *sbi, unsigned int mt) > > > > static inline bool f2fs_may_encrypt(struct inode *inode) > > { > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > umode_t mode = inode->i_mode; > > > > return (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)); > > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c > > index adf38c1b6414..4287cf348d3c 100644 > > --- a/fs/f2fs/super.c > > +++ b/fs/f2fs/super.c > > @@ -757,7 +757,7 @@ static int parse_options(struct super_block *sb, char *options) > > kfree(name); > > break; > > case Opt_test_dummy_encryption: > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > if (!f2fs_sb_has_encrypt(sb)) { > > f2fs_msg(sb, KERN_ERR, "Encrypt feature is off"); > > return -EINVAL; > > @@ -1387,7 +1387,7 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) > > seq_printf(seq, ",whint_mode=%s", "user-based"); > > else if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_FS) > > seq_printf(seq, ",whint_mode=%s", "fs-based"); > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > if (F2FS_OPTION(sbi).test_dummy_encryption) > > seq_puts(seq, ",test_dummy_encryption"); > > #endif > > @@ -2154,7 +2154,7 @@ static const struct super_operations f2fs_sops = { > > .remount_fs = f2fs_remount, > > }; > > > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > static int f2fs_get_context(struct inode *inode, void *ctx, size_t len) > > { > > return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION, > > @@ -3143,7 +3143,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) > > #endif > > > > sb->s_op = &f2fs_sops; > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > sb->s_cop = &f2fs_cryptops; > > #endif > > #ifdef CONFIG_F2FS_FS_VERITY > > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c > > index 5599c9ac4426..737677655bc0 100644 > > --- a/fs/f2fs/sysfs.c > > +++ b/fs/f2fs/sysfs.c > > @@ -430,7 +430,7 @@ F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes); > > F2FS_GENERAL_RO_ATTR(features); > > F2FS_GENERAL_RO_ATTR(current_reserved_blocks); > > > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO); > > #endif > > #ifdef CONFIG_BLK_DEV_ZONED > > @@ -493,7 +493,7 @@ static struct attribute *f2fs_attrs[] = { > > }; > > > > static struct attribute *f2fs_feat_attrs[] = { > > -#ifdef CONFIG_F2FS_FS_ENCRYPTION > > +#ifdef CONFIG_FS_ENCRYPTION > > ATTR_LIST(encryption), > > #endif > > #ifdef CONFIG_BLK_DEV_ZONED > > diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h > > index 952ab97af325..6ba193c23f37 100644 > > --- a/include/linux/fscrypt.h > > +++ b/include/linux/fscrypt.h > > @@ -2,9 +2,8 @@ > > /* > > * fscrypt.h: declarations for per-file encryption > > * > > - * Filesystems that implement per-file encryption include this header > > - * file with the __FS_HAS_ENCRYPTION set according to whether that filesystem > > - * is being built with encryption support or not. > > + * Filesystems that implement per-file encryption must include this header > > + * file. > > * > > * Copyright (C) 2015, Google, Inc. > > * > > @@ -15,6 +14,8 @@ > > #define _LINUX_FSCRYPT_H > > > > #include > > +#include > > +#include > > > > #define FS_CRYPTO_BLOCK_SIZE 16 > > > > @@ -42,11 +43,410 @@ struct fscrypt_name { > > /* Maximum value for the third parameter of fscrypt_operations.set_context(). */ > > #define FSCRYPT_SET_CONTEXT_MAX_SIZE 28 > > > > -#if __FS_HAS_ENCRYPTION > > -#include > > -#else > > -#include > > -#endif > > +#ifdef CONFIG_FS_ENCRYPTION > > +/* > > + * fscrypt superblock flags > > + */ > > +#define FS_CFLG_OWN_PAGES (1U << 1) > > + > > +/* > > + * crypto operations for filesystems > > + */ > > +struct fscrypt_operations { > > + unsigned int flags; > > + const char *key_prefix; > > + int (*get_context)(struct inode *, void *, size_t); > > + int (*set_context)(struct inode *, const void *, size_t, void *); > > + bool (*dummy_context)(struct inode *); > > + bool (*empty_dir)(struct inode *); > > + unsigned int max_namelen; > > +}; > > + > > +struct fscrypt_ctx { > > + union { > > + struct { > > + struct page *bounce_page; /* Ciphertext page */ > > + struct page *control_page; /* Original page */ > > + } w; > > + struct { > > + struct bio *bio; > > + struct work_struct work; > > + } r; > > + struct list_head free_list; /* Free list */ > > + }; > > + u8 flags; /* Flags */ > > +}; > > + > > +static inline bool fscrypt_has_encryption_key(const struct inode *inode) > > +{ > > + return (inode->i_crypt_info != NULL); > > +} > > + > > +static inline bool fscrypt_dummy_context_enabled(struct inode *inode) > > +{ > > + return inode->i_sb->s_cop->dummy_context && > > + inode->i_sb->s_cop->dummy_context(inode); > > +} > > + > > +/* crypto.c */ > > +extern void fscrypt_enqueue_decrypt_work(struct work_struct *); > > +extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t); > > +extern void fscrypt_release_ctx(struct fscrypt_ctx *); > > +extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *, > > + unsigned int, unsigned int, > > + u64, gfp_t); > > +extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int, > > + unsigned int, u64); > > + > > +static inline struct page *fscrypt_control_page(struct page *page) > > +{ > > + return ((struct fscrypt_ctx *)page_private(page))->w.control_page; > > +} > > + > > +extern void fscrypt_restore_control_page(struct page *); > > + > > +/* policy.c */ > > +extern int fscrypt_ioctl_set_policy(struct file *, const void __user *); > > +extern int fscrypt_ioctl_get_policy(struct file *, void __user *); > > +extern int fscrypt_has_permitted_context(struct inode *, struct inode *); > > +extern int fscrypt_inherit_context(struct inode *, struct inode *, > > + void *, bool); > > +/* keyinfo.c */ > > +extern int fscrypt_get_encryption_info(struct inode *); > > +extern void fscrypt_put_encryption_info(struct inode *); > > + > > +/* fname.c */ > > +extern int fscrypt_setup_filename(struct inode *, const struct qstr *, > > + int lookup, struct fscrypt_name *); > > + > > +static inline void fscrypt_free_filename(struct fscrypt_name *fname) > > +{ > > + kfree(fname->crypto_buf.name); > > +} > > + > > +extern int fscrypt_fname_alloc_buffer(const struct inode *, u32, > > + struct fscrypt_str *); > > +extern void fscrypt_fname_free_buffer(struct fscrypt_str *); > > +extern int fscrypt_fname_disk_to_usr(struct inode *, u32, u32, > > + const struct fscrypt_str *, struct fscrypt_str *); > > + > > +#define FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE 32 > > + > > +/* Extracts the second-to-last ciphertext block; see explanation below */ > > +#define FSCRYPT_FNAME_DIGEST(name, len) \ > > + ((name) + round_down((len) - FS_CRYPTO_BLOCK_SIZE - 1, \ > > + FS_CRYPTO_BLOCK_SIZE)) > > + > > +#define FSCRYPT_FNAME_DIGEST_SIZE FS_CRYPTO_BLOCK_SIZE > > + > > +/** > > + * fscrypt_digested_name - alternate identifier for an on-disk filename > > + * > > + * When userspace lists an encrypted directory without access to the key, > > + * filenames whose ciphertext is longer than FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE > > + * bytes are shown in this abbreviated form (base64-encoded) rather than as the > > + * full ciphertext (base64-encoded). This is necessary to allow supporting > > + * filenames up to NAME_MAX bytes, since base64 encoding expands the length. > > + * > > + * To make it possible for filesystems to still find the correct directory entry > > + * despite not knowing the full on-disk name, we encode any filesystem-specific > > + * 'hash' and/or 'minor_hash' which the filesystem may need for its lookups, > > + * followed by the second-to-last ciphertext block of the filename. Due to the > > + * use of the CBC-CTS encryption mode, the second-to-last ciphertext block > > + * depends on the full plaintext. (Note that ciphertext stealing causes the > > + * last two blocks to appear "flipped".) This makes accidental collisions very > > + * unlikely: just a 1 in 2^128 chance for two filenames to collide even if they > > + * share the same filesystem-specific hashes. > > + * > > + * However, this scheme isn't immune to intentional collisions, which can be > > + * created by anyone able to create arbitrary plaintext filenames and view them > > + * without the key. Making the "digest" be a real cryptographic hash like > > + * SHA-256 over the full ciphertext would prevent this, although it would be > > + * less efficient and harder to implement, especially since the filesystem would > > + * need to calculate it for each directory entry examined during a search. > > + */ > > +struct fscrypt_digested_name { > > + u32 hash; > > + u32 minor_hash; > > + u8 digest[FSCRYPT_FNAME_DIGEST_SIZE]; > > +}; > > + > > +/** > > + * fscrypt_match_name() - test whether the given name matches a directory entry > > + * @fname: the name being searched for > > + * @de_name: the name from the directory entry > > + * @de_name_len: the length of @de_name in bytes > > + * > > + * Normally @fname->disk_name will be set, and in that case we simply compare > > + * that to the name stored in the directory entry. The only exception is that > > + * if we don't have the key for an encrypted directory and a filename in it is > > + * very long, then we won't have the full disk_name and we'll instead need to > > + * match against the fscrypt_digested_name. > > + * > > + * Return: %true if the name matches, otherwise %false. > > + */ > > +static inline bool fscrypt_match_name(const struct fscrypt_name *fname, > > + const u8 *de_name, u32 de_name_len) > > +{ > > + if (unlikely(!fname->disk_name.name)) { > > + const struct fscrypt_digested_name *n = > > + (const void *)fname->crypto_buf.name; > > + if (WARN_ON_ONCE(fname->usr_fname->name[0] != '_')) > > + return false; > > + if (de_name_len <= FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE) > > + return false; > > + return !memcmp(FSCRYPT_FNAME_DIGEST(de_name, de_name_len), > > + n->digest, FSCRYPT_FNAME_DIGEST_SIZE); > > + } > > + > > + if (de_name_len != fname->disk_name.len) > > + return false; > > + return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len); > > +} > > + > > +/* bio.c */ > > +extern void fscrypt_decrypt_bio(struct bio *); > > +extern void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx, > > + struct bio *bio); > > +extern void fscrypt_pullback_bio_page(struct page **, bool); > > +extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t, > > + unsigned int); > > + > > +/* hooks.c */ > > +extern int fscrypt_file_open(struct inode *inode, struct file *filp); > > +extern int __fscrypt_prepare_link(struct inode *inode, struct inode *dir); > > +extern int __fscrypt_prepare_rename(struct inode *old_dir, > > + struct dentry *old_dentry, > > + struct inode *new_dir, > > + struct dentry *new_dentry, > > + unsigned int flags); > > +extern int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry); > > +extern int __fscrypt_prepare_symlink(struct inode *dir, unsigned int len, > > + unsigned int max_len, > > + struct fscrypt_str *disk_link); > > +extern int __fscrypt_encrypt_symlink(struct inode *inode, const char *target, > > + unsigned int len, > > + struct fscrypt_str *disk_link); > > +extern const char *fscrypt_get_symlink(struct inode *inode, const void *caddr, > > + unsigned int max_size, > > + struct delayed_call *done); > > +#else /* ! CONFIG_FS_ENCRYPTION */ > > + > > +static inline bool fscrypt_has_encryption_key(const struct inode *inode) > > +{ > > + return false; > > +} > > + > > +static inline bool fscrypt_dummy_context_enabled(struct inode *inode) > > +{ > > + return false; > > +} > > + > > +/* crypto.c */ > > +static inline void fscrypt_enqueue_decrypt_work(struct work_struct *work) > > +{ > > +} > > + > > +static inline struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode, > > + gfp_t gfp_flags) > > +{ > > + return ERR_PTR(-EOPNOTSUPP); > > +} > > + > > +static inline void fscrypt_release_ctx(struct fscrypt_ctx *ctx) > > +{ > > + return; > > +} > > + > > +static inline struct page *fscrypt_encrypt_page(const struct inode *inode, > > + struct page *page, > > + unsigned int len, > > + unsigned int offs, > > + u64 lblk_num, gfp_t gfp_flags) > > +{ > > + return ERR_PTR(-EOPNOTSUPP); > > +} > > + > > +static inline int fscrypt_decrypt_page(const struct inode *inode, > > + struct page *page, > > + unsigned int len, unsigned int offs, > > + u64 lblk_num) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline struct page *fscrypt_control_page(struct page *page) > > +{ > > + WARN_ON_ONCE(1); > > + return ERR_PTR(-EINVAL); > > +} > > + > > +static inline void fscrypt_restore_control_page(struct page *page) > > +{ > > + return; > > +} > > + > > +/* policy.c */ > > +static inline int fscrypt_ioctl_set_policy(struct file *filp, > > + const void __user *arg) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline int fscrypt_has_permitted_context(struct inode *parent, > > + struct inode *child) > > +{ > > + return 0; > > +} > > + > > +static inline int fscrypt_inherit_context(struct inode *parent, > > + struct inode *child, > > + void *fs_data, bool preload) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +/* keyinfo.c */ > > +static inline int fscrypt_get_encryption_info(struct inode *inode) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline void fscrypt_put_encryption_info(struct inode *inode) > > +{ > > + return; > > +} > > + > > + /* fname.c */ > > +static inline int fscrypt_setup_filename(struct inode *dir, > > + const struct qstr *iname, > > + int lookup, struct fscrypt_name *fname) > > +{ > > + if (IS_ENCRYPTED(dir)) > > + return -EOPNOTSUPP; > > + > > + memset(fname, 0, sizeof(struct fscrypt_name)); > > + fname->usr_fname = iname; > > + fname->disk_name.name = (unsigned char *)iname->name; > > + fname->disk_name.len = iname->len; > > + return 0; > > +} > > + > > +static inline void fscrypt_free_filename(struct fscrypt_name *fname) > > +{ > > + return; > > +} > > + > > +static inline int fscrypt_fname_alloc_buffer(const struct inode *inode, > > + u32 max_encrypted_len, > > + struct fscrypt_str *crypto_str) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str) > > +{ > > + return; > > +} > > + > > +static inline int fscrypt_fname_disk_to_usr(struct inode *inode, > > + u32 hash, u32 minor_hash, > > + const struct fscrypt_str *iname, > > + struct fscrypt_str *oname) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline bool fscrypt_match_name(const struct fscrypt_name *fname, > > + const u8 *de_name, u32 de_name_len) > > +{ > > + /* Encryption support disabled; use standard comparison */ > > + if (de_name_len != fname->disk_name.len) > > + return false; > > + return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len); > > +} > > + > > +/* bio.c */ > > +static inline void fscrypt_decrypt_bio(struct bio *bio) > > +{ > > +} > > + > > +static inline void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx, > > + struct bio *bio) > > +{ > > +} > > + > > +static inline void fscrypt_pullback_bio_page(struct page **page, bool restore) > > +{ > > + return; > > +} > > + > > +static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, > > + sector_t pblk, unsigned int len) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +/* hooks.c */ > > + > > +static inline int fscrypt_file_open(struct inode *inode, struct file *filp) > > +{ > > + if (IS_ENCRYPTED(inode)) > > + return -EOPNOTSUPP; > > + return 0; > > +} > > + > > +static inline int __fscrypt_prepare_link(struct inode *inode, > > + struct inode *dir) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline int __fscrypt_prepare_rename(struct inode *old_dir, > > + struct dentry *old_dentry, > > + struct inode *new_dir, > > + struct dentry *new_dentry, > > + unsigned int flags) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline int __fscrypt_prepare_lookup(struct inode *dir, > > + struct dentry *dentry) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline int __fscrypt_prepare_symlink(struct inode *dir, > > + unsigned int len, > > + unsigned int max_len, > > + struct fscrypt_str *disk_link) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > + > > +static inline int __fscrypt_encrypt_symlink(struct inode *inode, > > + const char *target, > > + unsigned int len, > > + struct fscrypt_str *disk_link) > > +{ > > + return -EOPNOTSUPP; > > +} > > + > > +static inline const char *fscrypt_get_symlink(struct inode *inode, > > + const void *caddr, > > + unsigned int max_size, > > + struct delayed_call *done) > > +{ > > + return ERR_PTR(-EOPNOTSUPP); > > +} > > +#endif /* ! CONFIG_FS_ENCRYPTION */ > > > > /** > > * fscrypt_require_key - require an inode's encryption key > > diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h > > deleted file mode 100644 > > index ee8b43e4c15a..000000000000 > > --- a/include/linux/fscrypt_notsupp.h > > +++ /dev/null > > @@ -1,231 +0,0 @@ > > -/* SPDX-License-Identifier: GPL-2.0 */ > > -/* > > - * fscrypt_notsupp.h > > - * > > - * This stubs out the fscrypt functions for filesystems configured without > > - * encryption support. > > - * > > - * Do not include this file directly. Use fscrypt.h instead! > > - */ > > -#ifndef _LINUX_FSCRYPT_H > > -#error "Incorrect include of linux/fscrypt_notsupp.h!" > > -#endif > > - > > -#ifndef _LINUX_FSCRYPT_NOTSUPP_H > > -#define _LINUX_FSCRYPT_NOTSUPP_H > > - > > -static inline bool fscrypt_has_encryption_key(const struct inode *inode) > > -{ > > - return false; > > -} > > - > > -static inline bool fscrypt_dummy_context_enabled(struct inode *inode) > > -{ > > - return false; > > -} > > - > > -/* crypto.c */ > > -static inline void fscrypt_enqueue_decrypt_work(struct work_struct *work) > > -{ > > -} > > - > > -static inline struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode, > > - gfp_t gfp_flags) > > -{ > > - return ERR_PTR(-EOPNOTSUPP); > > -} > > - > > -static inline void fscrypt_release_ctx(struct fscrypt_ctx *ctx) > > -{ > > - return; > > -} > > - > > -static inline struct page *fscrypt_encrypt_page(const struct inode *inode, > > - struct page *page, > > - unsigned int len, > > - unsigned int offs, > > - u64 lblk_num, gfp_t gfp_flags) > > -{ > > - return ERR_PTR(-EOPNOTSUPP); > > -} > > - > > -static inline int fscrypt_decrypt_page(const struct inode *inode, > > - struct page *page, > > - unsigned int len, unsigned int offs, > > - u64 lblk_num) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline struct page *fscrypt_control_page(struct page *page) > > -{ > > - WARN_ON_ONCE(1); > > - return ERR_PTR(-EINVAL); > > -} > > - > > -static inline void fscrypt_restore_control_page(struct page *page) > > -{ > > - return; > > -} > > - > > -/* policy.c */ > > -static inline int fscrypt_ioctl_set_policy(struct file *filp, > > - const void __user *arg) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline int fscrypt_has_permitted_context(struct inode *parent, > > - struct inode *child) > > -{ > > - return 0; > > -} > > - > > -static inline int fscrypt_inherit_context(struct inode *parent, > > - struct inode *child, > > - void *fs_data, bool preload) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -/* keyinfo.c */ > > -static inline int fscrypt_get_encryption_info(struct inode *inode) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline void fscrypt_put_encryption_info(struct inode *inode) > > -{ > > - return; > > -} > > - > > - /* fname.c */ > > -static inline int fscrypt_setup_filename(struct inode *dir, > > - const struct qstr *iname, > > - int lookup, struct fscrypt_name *fname) > > -{ > > - if (IS_ENCRYPTED(dir)) > > - return -EOPNOTSUPP; > > - > > - memset(fname, 0, sizeof(struct fscrypt_name)); > > - fname->usr_fname = iname; > > - fname->disk_name.name = (unsigned char *)iname->name; > > - fname->disk_name.len = iname->len; > > - return 0; > > -} > > - > > -static inline void fscrypt_free_filename(struct fscrypt_name *fname) > > -{ > > - return; > > -} > > - > > -static inline int fscrypt_fname_alloc_buffer(const struct inode *inode, > > - u32 max_encrypted_len, > > - struct fscrypt_str *crypto_str) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str) > > -{ > > - return; > > -} > > - > > -static inline int fscrypt_fname_disk_to_usr(struct inode *inode, > > - u32 hash, u32 minor_hash, > > - const struct fscrypt_str *iname, > > - struct fscrypt_str *oname) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline bool fscrypt_match_name(const struct fscrypt_name *fname, > > - const u8 *de_name, u32 de_name_len) > > -{ > > - /* Encryption support disabled; use standard comparison */ > > - if (de_name_len != fname->disk_name.len) > > - return false; > > - return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len); > > -} > > - > > -/* bio.c */ > > -static inline void fscrypt_decrypt_bio(struct bio *bio) > > -{ > > -} > > - > > -static inline void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx, > > - struct bio *bio) > > -{ > > -} > > - > > -static inline void fscrypt_pullback_bio_page(struct page **page, bool restore) > > -{ > > - return; > > -} > > - > > -static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, > > - sector_t pblk, unsigned int len) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -/* hooks.c */ > > - > > -static inline int fscrypt_file_open(struct inode *inode, struct file *filp) > > -{ > > - if (IS_ENCRYPTED(inode)) > > - return -EOPNOTSUPP; > > - return 0; > > -} > > - > > -static inline int __fscrypt_prepare_link(struct inode *inode, > > - struct inode *dir) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline int __fscrypt_prepare_rename(struct inode *old_dir, > > - struct dentry *old_dentry, > > - struct inode *new_dir, > > - struct dentry *new_dentry, > > - unsigned int flags) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline int __fscrypt_prepare_lookup(struct inode *dir, > > - struct dentry *dentry) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline int __fscrypt_prepare_symlink(struct inode *dir, > > - unsigned int len, > > - unsigned int max_len, > > - struct fscrypt_str *disk_link) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline int __fscrypt_encrypt_symlink(struct inode *inode, > > - const char *target, > > - unsigned int len, > > - struct fscrypt_str *disk_link) > > -{ > > - return -EOPNOTSUPP; > > -} > > - > > -static inline const char *fscrypt_get_symlink(struct inode *inode, > > - const void *caddr, > > - unsigned int max_size, > > - struct delayed_call *done) > > -{ > > - return ERR_PTR(-EOPNOTSUPP); > > -} > > - > > -#endif /* _LINUX_FSCRYPT_NOTSUPP_H */ > > diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h > > deleted file mode 100644 > > index 6456c6b2005f..000000000000 > > --- a/include/linux/fscrypt_supp.h > > +++ /dev/null > > @@ -1,204 +0,0 @@ > > -/* SPDX-License-Identifier: GPL-2.0 */ > > -/* > > - * fscrypt_supp.h > > - * > > - * Do not include this file directly. Use fscrypt.h instead! > > - */ > > -#ifndef _LINUX_FSCRYPT_H > > -#error "Incorrect include of linux/fscrypt_supp.h!" > > -#endif > > - > > -#ifndef _LINUX_FSCRYPT_SUPP_H > > -#define _LINUX_FSCRYPT_SUPP_H > > - > > -#include > > -#include > > - > > -/* > > - * fscrypt superblock flags > > - */ > > -#define FS_CFLG_OWN_PAGES (1U << 1) > > - > > -/* > > - * crypto operations for filesystems > > - */ > > -struct fscrypt_operations { > > - unsigned int flags; > > - const char *key_prefix; > > - int (*get_context)(struct inode *, void *, size_t); > > - int (*set_context)(struct inode *, const void *, size_t, void *); > > - bool (*dummy_context)(struct inode *); > > - bool (*empty_dir)(struct inode *); > > - unsigned int max_namelen; > > -}; > > - > > -struct fscrypt_ctx { > > - union { > > - struct { > > - struct page *bounce_page; /* Ciphertext page */ > > - struct page *control_page; /* Original page */ > > - } w; > > - struct { > > - struct bio *bio; > > - struct work_struct work; > > - } r; > > - struct list_head free_list; /* Free list */ > > - }; > > - u8 flags; /* Flags */ > > -}; > > - > > -static inline bool fscrypt_has_encryption_key(const struct inode *inode) > > -{ > > - return (inode->i_crypt_info != NULL); > > -} > > - > > -static inline bool fscrypt_dummy_context_enabled(struct inode *inode) > > -{ > > - return inode->i_sb->s_cop->dummy_context && > > - inode->i_sb->s_cop->dummy_context(inode); > > -} > > - > > -/* crypto.c */ > > -extern void fscrypt_enqueue_decrypt_work(struct work_struct *); > > -extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t); > > -extern void fscrypt_release_ctx(struct fscrypt_ctx *); > > -extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *, > > - unsigned int, unsigned int, > > - u64, gfp_t); > > -extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int, > > - unsigned int, u64); > > - > > -static inline struct page *fscrypt_control_page(struct page *page) > > -{ > > - return ((struct fscrypt_ctx *)page_private(page))->w.control_page; > > -} > > - > > -extern void fscrypt_restore_control_page(struct page *); > > - > > -/* policy.c */ > > -extern int fscrypt_ioctl_set_policy(struct file *, const void __user *); > > -extern int fscrypt_ioctl_get_policy(struct file *, void __user *); > > -extern int fscrypt_has_permitted_context(struct inode *, struct inode *); > > -extern int fscrypt_inherit_context(struct inode *, struct inode *, > > - void *, bool); > > -/* keyinfo.c */ > > -extern int fscrypt_get_encryption_info(struct inode *); > > -extern void fscrypt_put_encryption_info(struct inode *); > > - > > -/* fname.c */ > > -extern int fscrypt_setup_filename(struct inode *, const struct qstr *, > > - int lookup, struct fscrypt_name *); > > - > > -static inline void fscrypt_free_filename(struct fscrypt_name *fname) > > -{ > > - kfree(fname->crypto_buf.name); > > -} > > - > > -extern int fscrypt_fname_alloc_buffer(const struct inode *, u32, > > - struct fscrypt_str *); > > -extern void fscrypt_fname_free_buffer(struct fscrypt_str *); > > -extern int fscrypt_fname_disk_to_usr(struct inode *, u32, u32, > > - const struct fscrypt_str *, struct fscrypt_str *); > > - > > -#define FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE 32 > > - > > -/* Extracts the second-to-last ciphertext block; see explanation below */ > > -#define FSCRYPT_FNAME_DIGEST(name, len) \ > > - ((name) + round_down((len) - FS_CRYPTO_BLOCK_SIZE - 1, \ > > - FS_CRYPTO_BLOCK_SIZE)) > > - > > -#define FSCRYPT_FNAME_DIGEST_SIZE FS_CRYPTO_BLOCK_SIZE > > - > > -/** > > - * fscrypt_digested_name - alternate identifier for an on-disk filename > > - * > > - * When userspace lists an encrypted directory without access to the key, > > - * filenames whose ciphertext is longer than FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE > > - * bytes are shown in this abbreviated form (base64-encoded) rather than as the > > - * full ciphertext (base64-encoded). This is necessary to allow supporting > > - * filenames up to NAME_MAX bytes, since base64 encoding expands the length. > > - * > > - * To make it possible for filesystems to still find the correct directory entry > > - * despite not knowing the full on-disk name, we encode any filesystem-specific > > - * 'hash' and/or 'minor_hash' which the filesystem may need for its lookups, > > - * followed by the second-to-last ciphertext block of the filename. Due to the > > - * use of the CBC-CTS encryption mode, the second-to-last ciphertext block > > - * depends on the full plaintext. (Note that ciphertext stealing causes the > > - * last two blocks to appear "flipped".) This makes accidental collisions very > > - * unlikely: just a 1 in 2^128 chance for two filenames to collide even if they > > - * share the same filesystem-specific hashes. > > - * > > - * However, this scheme isn't immune to intentional collisions, which can be > > - * created by anyone able to create arbitrary plaintext filenames and view them > > - * without the key. Making the "digest" be a real cryptographic hash like > > - * SHA-256 over the full ciphertext would prevent this, although it would be > > - * less efficient and harder to implement, especially since the filesystem would > > - * need to calculate it for each directory entry examined during a search. > > - */ > > -struct fscrypt_digested_name { > > - u32 hash; > > - u32 minor_hash; > > - u8 digest[FSCRYPT_FNAME_DIGEST_SIZE]; > > -}; > > - > > -/** > > - * fscrypt_match_name() - test whether the given name matches a directory entry > > - * @fname: the name being searched for > > - * @de_name: the name from the directory entry > > - * @de_name_len: the length of @de_name in bytes > > - * > > - * Normally @fname->disk_name will be set, and in that case we simply compare > > - * that to the name stored in the directory entry. The only exception is that > > - * if we don't have the key for an encrypted directory and a filename in it is > > - * very long, then we won't have the full disk_name and we'll instead need to > > - * match against the fscrypt_digested_name. > > - * > > - * Return: %true if the name matches, otherwise %false. > > - */ > > -static inline bool fscrypt_match_name(const struct fscrypt_name *fname, > > - const u8 *de_name, u32 de_name_len) > > -{ > > - if (unlikely(!fname->disk_name.name)) { > > - const struct fscrypt_digested_name *n = > > - (const void *)fname->crypto_buf.name; > > - if (WARN_ON_ONCE(fname->usr_fname->name[0] != '_')) > > - return false; > > - if (de_name_len <= FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE) > > - return false; > > - return !memcmp(FSCRYPT_FNAME_DIGEST(de_name, de_name_len), > > - n->digest, FSCRYPT_FNAME_DIGEST_SIZE); > > - } > > - > > - if (de_name_len != fname->disk_name.len) > > - return false; > > - return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len); > > -} > > - > > -/* bio.c */ > > -extern void fscrypt_decrypt_bio(struct bio *); > > -extern void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx, > > - struct bio *bio); > > -extern void fscrypt_pullback_bio_page(struct page **, bool); > > -extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t, > > - unsigned int); > > - > > -/* hooks.c */ > > -extern int fscrypt_file_open(struct inode *inode, struct file *filp); > > -extern int __fscrypt_prepare_link(struct inode *inode, struct inode *dir); > > -extern int __fscrypt_prepare_rename(struct inode *old_dir, > > - struct dentry *old_dentry, > > - struct inode *new_dir, > > - struct dentry *new_dentry, > > - unsigned int flags); > > -extern int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry); > > -extern int __fscrypt_prepare_symlink(struct inode *dir, unsigned int len, > > - unsigned int max_len, > > - struct fscrypt_str *disk_link); > > -extern int __fscrypt_encrypt_symlink(struct inode *inode, const char *target, > > - unsigned int len, > > - struct fscrypt_str *disk_link); > > -extern const char *fscrypt_get_symlink(struct inode *inode, const void *caddr, > > - unsigned int max_size, > > - struct delayed_call *done); > > - > > -#endif /* _LINUX_FSCRYPT_SUPP_H */ > > -- chandan