Re: [PATCH V2 1/7] ext4: use IS_ENCRYPTED() to check encryption status

Eric Biggers
2018-12-04T23:12:10Z

On Tue, Dec 04, 2018 at 03:26:44PM +0530, Chandan Rajendra wrote:
> This commit removes the ext4 specific ext4_encrypted_inode() and makes
> use of the generic IS_ENCRYPTED() macro to check for the encryption
> status of an inode.
>
> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>

Reviewed-by: Eric Biggers <ebiggers@google.com>

Though if you send this out again, there are a few places where you can remove a
line break while remaining within 80 characters, due to IS_ENCRYPTED() being
shorter than ext4_encrypted_inode().

- Eric

> ---
> fs/ext4/dir.c | 8 ++++----
> fs/ext4/ext4.h | 5 -----
> fs/ext4/ext4_jbd2.h | 2 +-
> fs/ext4/extents.c | 4 ++--
> fs/ext4/ialloc.c | 2 +-
> fs/ext4/inode.c | 14 +++++++-------
> fs/ext4/move_extent.c | 3 +--
> fs/ext4/namei.c | 8 ++++----
> fs/ext4/page-io.c | 2 +-
> fs/ext4/readpage.c | 2 +-
> 10 files changed, 22 insertions(+), 28 deletions(-)
>
> diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
> index f93f9881ec18..fb7a64ea5679 100644
> --- a/fs/ext4/dir.c
> +++ b/fs/ext4/dir.c
> @@ -111,7 +111,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
> int dir_has_error = 0;
> struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
>
> - if (ext4_encrypted_inode(inode)) {
> + if (IS_ENCRYPTED(inode)) {
> err = fscrypt_get_encryption_info(inode);
> if (err && err != -ENOKEY)
> return err;
> @@ -138,7 +138,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
> return err;
> }
>
> - if (ext4_encrypted_inode(inode)) {
> + if (IS_ENCRYPTED(inode)) {
> err = fscrypt_fname_alloc_buffer(inode, EXT4_NAME_LEN, &fstr);
> if (err < 0)
> return err;
> @@ -245,7 +245,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
> offset += ext4_rec_len_from_disk(de->rec_len,
> sb->s_blocksize);
> if (le32_to_cpu(de->inode)) {
> - if (!ext4_encrypted_inode(inode)) {
> + if (!IS_ENCRYPTED(inode)) {
> if (!dir_emit(ctx, de->name,
> de->name_len,
> le32_to_cpu(de->inode),
> @@ -613,7 +613,7 @@ static int ext4_dx_readdir(struct file *file, struct dir_context *ctx)
>
> static int ext4_dir_open(struct inode * inode, struct file * filp)
> {
> - if (ext4_encrypted_inode(inode))
> + if (IS_ENCRYPTED(inode))
> return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
> return 0;
> }
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 80957f9d3cbe..2ae6ab88f218 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2297,11 +2297,6 @@ extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
> struct ext4_group_desc *gdp);
> ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
>
> -static inline bool ext4_encrypted_inode(struct inode *inode)
> -{
> - return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
> -}
> -
> static inline bool ext4_verity_inode(struct inode *inode)
> {
> #ifdef CONFIG_EXT4_FS_VERITY
> diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
> index 15b6dd733780..a1ac7e9245ec 100644
> --- a/fs/ext4/ext4_jbd2.h
> +++ b/fs/ext4/ext4_jbd2.h
> @@ -411,7 +411,7 @@ static inline int ext4_inode_journal_mode(struct inode *inode)
> (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
> !test_opt(inode->i_sb, DELALLOC))) {
> /* We do not support data journalling for encrypted data */
> - if (S_ISREG(inode->i_mode) && ext4_encrypted_inode(inode))
> + if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
> return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
> return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
> }
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 240b6dea5441..79d986dbf5af 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3631,7 +3631,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
> max_zeroout = sbi->s_extent_max_zeroout_kb >>
> (inode->i_sb->s_blocksize_bits - 10);
>
> - if (ext4_encrypted_inode(inode))
> + if (IS_ENCRYPTED(inode))
> max_zeroout = 0;
>
> /*
> @@ -4818,7 +4818,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
> * leave it disabled for encrypted inodes for now. This is a
> * bug we should fix....
> */
> - if (ext4_encrypted_inode(inode) &&
> + if (IS_ENCRYPTED(inode) &&
> (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE |
> FALLOC_FL_ZERO_RANGE)))
> return -EOPNOTSUPP;
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 2addcb8730e1..3002f110eb4f 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -771,7 +771,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
> if (unlikely(ext4_forced_shutdown(sbi)))
> return ERR_PTR(-EIO);
>
> - if ((ext4_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
> + if ((IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
> (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) &&
> !(i_flags & EXT4_EA_INODE_FL)) {
> err = fscrypt_get_encryption_info(dir);
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index d7019f5dca6f..ef835bd46155 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -415,7 +415,7 @@ int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, ext4_fsblk_t pblk,
> {
> int ret;
>
> - if (ext4_encrypted_inode(inode))
> + if (IS_ENCRYPTED(inode))
> return fscrypt_zeroout_range(inode, lblk, pblk, len);
>
> ret = sb_issue_zeroout(inode->i_sb, pblk, len, GFP_NOFS);
> @@ -1217,7 +1217,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
> (block_start < from || block_end > to)) {
> ll_rw_block(REQ_OP_READ, 0, 1, &bh);
> *wait_bh++ = bh;
> - decrypt = ext4_encrypted_inode(inode) &&
> + decrypt = IS_ENCRYPTED(inode) &&
> S_ISREG(inode->i_mode);
> }
> }
> @@ -3880,7 +3880,7 @@ static ssize_t ext4_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
> ssize_t ret;
>
> #ifdef CONFIG_EXT4_FS_ENCRYPTION
> - if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode))
> + if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode))
> return 0;
> #endif
>
> @@ -4068,7 +4068,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
> if (!buffer_uptodate(bh))
> goto unlock;
> if (S_ISREG(inode->i_mode) &&
> - ext4_encrypted_inode(inode)) {
> + IS_ENCRYPTED(inode)) {
> /* We expect the key to be set. */
> BUG_ON(!fscrypt_has_encryption_key(inode));
> BUG_ON(blocksize != PAGE_SIZE);
> @@ -4144,7 +4144,7 @@ static int ext4_block_truncate_page(handle_t *handle,
> struct inode *inode = mapping->host;
>
> /* If we are processing an encrypted inode during orphan list handling */
> - if (ext4_encrypted_inode(inode) && !fscrypt_has_encryption_key(inode))
> + if (IS_ENCRYPTED(inode) && !fscrypt_has_encryption_key(inode))
> return 0;
>
> blocksize = inode->i_sb->s_blocksize;
> @@ -4724,7 +4724,7 @@ static bool ext4_should_use_dax(struct inode *inode)
> return false;
> if (ext4_has_inline_data(inode))
> return false;
> - if (ext4_encrypted_inode(inode))
> + if (ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT))
> return false;
> if (ext4_verity_inode(inode))
> return false;
> @@ -5050,7 +5050,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> ret = -EFSCORRUPTED;
> goto bad_inode;
> }
> - if (ext4_encrypted_inode(inode)) {
> + if (IS_ENCRYPTED(inode)) {
> inode->i_op = &ext4_encrypted_symlink_inode_operations;
> ext4_set_aops(inode);
> } else if (ext4_inode_is_fast_symlink(inode)) {
> diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
> index 2f5be02fc6f6..1083a9f3f16a 100644
> --- a/fs/ext4/move_extent.c
> +++ b/fs/ext4/move_extent.c
> @@ -592,8 +592,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
> return -EOPNOTSUPP;
> }
>
> - if (ext4_encrypted_inode(orig_inode) ||
> - ext4_encrypted_inode(donor_inode)) {
> + if (IS_ENCRYPTED(orig_inode) || IS_ENCRYPTED(donor_inode)) {
> ext4_msg(orig_inode->i_sb, KERN_ERR,
> "Online defrag not supported for encrypted files");
> return -EOPNOTSUPP;
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 67a38532032a..0de60207a963 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -620,7 +620,7 @@ static struct stats dx_show_leaf(struct inode *dir,
>
> name = de->name;
> len = de->name_len;
> - if (ext4_encrypted_inode(dir))
> + if (IS_ENCRYPTED(dir))
> res = fscrypt_get_encryption_info(dir);
> if (res) {
> printk(KERN_WARNING "Error setting up"
> @@ -985,7 +985,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
> EXT4_DIR_REC_LEN(0));
> #ifdef CONFIG_EXT4_FS_ENCRYPTION
> /* Check if the directory is encrypted */
> - if (ext4_encrypted_inode(dir)) {
> + if (IS_ENCRYPTED(dir)) {
> err = fscrypt_get_encryption_info(dir);
> if (err < 0) {
> brelse(bh);
> @@ -1014,7 +1014,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
> continue;
> if (de->inode == 0)
> continue;
> - if (!ext4_encrypted_inode(dir)) {
> + if (!IS_ENCRYPTED(dir)) {
> tmp_str.name = de->name;
> tmp_str.len = de->name_len;
> err = ext4_htree_store_dirent(dir_file,
> @@ -1577,7 +1577,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
> ino);
> return ERR_PTR(-EFSCORRUPTED);
> }
> - if (!IS_ERR(inode) && ext4_encrypted_inode(dir) &&
> + if (!IS_ERR(inode) && IS_ENCRYPTED(dir) &&
> (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
> !fscrypt_has_permitted_context(dir, inode)) {
> ext4_warning(inode->i_sb,
> diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
> index 2aa62d58d8dd..008c20b58f98 100644
> --- a/fs/ext4/page-io.c
> +++ b/fs/ext4/page-io.c
> @@ -477,7 +477,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
>
> bh = head = page_buffers(page);
>
> - if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode) &&
> + if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode) &&
> nr_to_submit) {
> gfp_t gfp_flags = GFP_NOFS;
>
> diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
> index d3dd1ff745db..45e707fb9749 100644
> --- a/fs/ext4/readpage.c
> +++ b/fs/ext4/readpage.c
> @@ -156,7 +156,7 @@ static struct bio_post_read_ctx *get_bio_post_read_ctx(struct inode *inode,
> unsigned int post_read_steps = 0;
> struct bio_post_read_ctx *ctx = NULL;
>
> - if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode))
> + if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode))
> post_read_steps |= 1 << STEP_DECRYPT;
> #ifdef CONFIG_EXT4_FS_VERITY
> if (inode->i_verity_info != NULL &&
> --
> 2.19.1
>