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authorEric Biggers <ebiggers@google.com>2017-10-09 22:15:35 +0300
committerTheodore Ts'o <tytso@mit.edu>2017-10-19 02:52:36 +0300
commit2ee6a576be56427209d370d8a511d49340c84139 (patch)
tree89d2ee3ffbfbc9fe0b120b7ba255fdf073896e24 /fs/ext4/inode.c
parent734f0d241d2b4e47383bd0d16e21e06f6cb8d2c3 (diff)
downloadlinux-2ee6a576be56427209d370d8a511d49340c84139.tar.xz
fs, fscrypt: add an S_ENCRYPTED inode flag
Introduce a flag S_ENCRYPTED which can be set in ->i_flags to indicate that the inode is encrypted using the fscrypt (fs/crypto/) mechanism. Checking this flag will give the same information that inode->i_sb->s_cop->is_encrypted(inode) currently does, but will be more efficient. This will be useful for adding higher-level helper functions for filesystems to use. For example we'll be able to replace this: if (ext4_encrypted_inode(inode)) { ret = fscrypt_get_encryption_info(inode); if (ret) return ret; if (!fscrypt_has_encryption_key(inode)) return -ENOKEY; } with this: ret = fscrypt_require_key(inode); if (ret) return ret; ... since we'll be able to retain the fast path for unencrypted files as a single flag check, using an inline function. This wasn't possible before because we'd have had to frequently call through the ->i_sb->s_cop->is_encrypted function pointer, even when the encryption support was disabled or not being used. Note: we don't define S_ENCRYPTED to 0 if CONFIG_FS_ENCRYPTION is disabled because we want to continue to return an error if an encrypted file is accessed without encryption support, rather than pretending that it is unencrypted. Reviewed-by: Chao Yu <yuchao0@huawei.com> Acked-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/inode.c')
-rw-r--r--fs/ext4/inode.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 31db875bc7a1..d5a471939fbc 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4589,10 +4589,13 @@ void ext4_set_inode_flags(struct inode *inode)
new_fl |= S_DIRSYNC;
if (test_opt(inode->i_sb, DAX) && S_ISREG(inode->i_mode) &&
!ext4_should_journal_data(inode) && !ext4_has_inline_data(inode) &&
- !ext4_encrypted_inode(inode))
+ !(flags & EXT4_ENCRYPT_FL))
new_fl |= S_DAX;
+ if (flags & EXT4_ENCRYPT_FL)
+ new_fl |= S_ENCRYPTED;
inode_set_flags(inode, new_fl,
- S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);
+ S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX|
+ S_ENCRYPTED);
}
static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,