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SubjectRe: [RFC][PATCH v2 05/10] exofs: use common file type conversion
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On 23/10/18 23:19, Phillip Potter wrote:
> Deduplicate the exofs file type conversion implementation.
>
> Original patch by Amir Goldstein.
>
> v2:
> - This version does not remove EXOFS_FT_x enum from fs/exofs/common.h,
> as these values are now used in compile-time checks added by
> Phillip Potter to make sure they remain the same as FT_x values
>
> v1:
> - Initial implementation
>
> Signed-off-by: Phillip Potter <phil@philpotter.co.uk>

Yes thank you, totally

ACK-by: Boaz Harrosh <ooo@electrozaur.com>

> ---
> fs/exofs/dir.c | 49 ++++++++++++++++++-------------------------------
> 1 file changed, 18 insertions(+), 31 deletions(-)
>
> diff --git a/fs/exofs/dir.c b/fs/exofs/dir.c
> index f0138674c1ed..2e3161ca9014 100644
> --- a/fs/exofs/dir.c
> +++ b/fs/exofs/dir.c
> @@ -204,33 +204,10 @@ exofs_validate_entry(char *base, unsigned offset, unsigned mask)
> return (char *)p - base;
> }
>
> -static unsigned char exofs_filetype_table[EXOFS_FT_MAX] = {
> - [EXOFS_FT_UNKNOWN] = DT_UNKNOWN,
> - [EXOFS_FT_REG_FILE] = DT_REG,
> - [EXOFS_FT_DIR] = DT_DIR,
> - [EXOFS_FT_CHRDEV] = DT_CHR,
> - [EXOFS_FT_BLKDEV] = DT_BLK,
> - [EXOFS_FT_FIFO] = DT_FIFO,
> - [EXOFS_FT_SOCK] = DT_SOCK,
> - [EXOFS_FT_SYMLINK] = DT_LNK,
> -};
> -
> -#define S_SHIFT 12
> -static unsigned char exofs_type_by_mode[S_IFMT >> S_SHIFT] = {
> - [S_IFREG >> S_SHIFT] = EXOFS_FT_REG_FILE,
> - [S_IFDIR >> S_SHIFT] = EXOFS_FT_DIR,
> - [S_IFCHR >> S_SHIFT] = EXOFS_FT_CHRDEV,
> - [S_IFBLK >> S_SHIFT] = EXOFS_FT_BLKDEV,
> - [S_IFIFO >> S_SHIFT] = EXOFS_FT_FIFO,
> - [S_IFSOCK >> S_SHIFT] = EXOFS_FT_SOCK,
> - [S_IFLNK >> S_SHIFT] = EXOFS_FT_SYMLINK,
> -};
> -
> static inline
> void exofs_set_de_type(struct exofs_dir_entry *de, struct inode *inode)
> {
> - umode_t mode = inode->i_mode;
> - de->file_type = exofs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
> + de->file_type = fs_umode_to_ftype(inode->i_mode);
> }
>
> static int
> @@ -279,17 +256,27 @@ exofs_readdir(struct file *file, struct dir_context *ctx)
> exofs_put_page(page);
> return -EIO;
> }
> - if (de->inode_no) {
> - unsigned char t;
>
> - if (de->file_type < EXOFS_FT_MAX)
> - t = exofs_filetype_table[de->file_type];
> - else
> - t = DT_UNKNOWN;
> + /*
> + * compile-time asserts that generic FT_x types
> + * still match EXOFS_FT_x types - no need to list
> + * for other functions as well as build will
> + * fail either way
> + */
> + BUILD_BUG_ON(EXOFS_FT_UNKNOWN != FT_UNKNOWN);
> + BUILD_BUG_ON(EXOFS_FT_REG_FILE != FT_REG_FILE);
> + BUILD_BUG_ON(EXOFS_FT_DIR != FT_DIR);
> + BUILD_BUG_ON(EXOFS_FT_CHRDEV != FT_CHRDEV);
> + BUILD_BUG_ON(EXOFS_FT_BLKDEV != FT_BLKDEV);
> + BUILD_BUG_ON(EXOFS_FT_FIFO != FT_FIFO);
> + BUILD_BUG_ON(EXOFS_FT_SOCK != FT_SOCK);
> + BUILD_BUG_ON(EXOFS_FT_SYMLINK != FT_SYMLINK);
> + BUILD_BUG_ON(EXOFS_FT_MAX != FT_MAX);
>
> + if (de->inode_no) {
> if (!dir_emit(ctx, de->name, de->name_len,
> le64_to_cpu(de->inode_no),
> - t)) {
> + fs_dtype(de->file_type))) {
> exofs_put_page(page);
> return 0;
> }
>

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