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[62.64.249.96]) by smtp.gmail.com with ESMTPSA id x8-v6sm5000735wrd.54.2018.10.23.14.20.06 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 23 Oct 2018 14:20:06 -0700 (PDT) Date: Tue, 23 Oct 2018 22:20:05 +0100 From: Phillip Potter To: jack@suse.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, amir73il@gmail.com, viro@zeniv.linux.org.uk, linux-ext4@vger.kernel.org Subject: [RFC][PATCH v2 04/10] ext2: use common file type conversion Message-ID: <20181023212005.GA16631@pathfinder> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Deduplicate the ext2 file type conversion implementation. Original patch by Amir Goldstein. v2: - Rebased against Linux 4.19 by Phillip Potter - This version does not remove EXT2_FT_x enum from fs/ext2/ext2.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 --- fs/ext2/dir.c | 51 ++++++++++++++++++++++----------------------------- 1 file changed, 22 insertions(+), 29 deletions(-) diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c index 3b8114def693..420d4b9e8980 100644 --- a/fs/ext2/dir.c +++ b/fs/ext2/dir.c @@ -252,33 +252,10 @@ ext2_validate_entry(char *base, unsigned offset, unsigned mask) return (char *)p - base; } -static unsigned char ext2_filetype_table[EXT2_FT_MAX] = { - [EXT2_FT_UNKNOWN] = DT_UNKNOWN, - [EXT2_FT_REG_FILE] = DT_REG, - [EXT2_FT_DIR] = DT_DIR, - [EXT2_FT_CHRDEV] = DT_CHR, - [EXT2_FT_BLKDEV] = DT_BLK, - [EXT2_FT_FIFO] = DT_FIFO, - [EXT2_FT_SOCK] = DT_SOCK, - [EXT2_FT_SYMLINK] = DT_LNK, -}; - -#define S_SHIFT 12 -static unsigned char ext2_type_by_mode[S_IFMT >> S_SHIFT] = { - [S_IFREG >> S_SHIFT] = EXT2_FT_REG_FILE, - [S_IFDIR >> S_SHIFT] = EXT2_FT_DIR, - [S_IFCHR >> S_SHIFT] = EXT2_FT_CHRDEV, - [S_IFBLK >> S_SHIFT] = EXT2_FT_BLKDEV, - [S_IFIFO >> S_SHIFT] = EXT2_FT_FIFO, - [S_IFSOCK >> S_SHIFT] = EXT2_FT_SOCK, - [S_IFLNK >> S_SHIFT] = EXT2_FT_SYMLINK, -}; - static inline void ext2_set_de_type(ext2_dirent *de, struct inode *inode) { - umode_t mode = inode->i_mode; if (EXT2_HAS_INCOMPAT_FEATURE(inode->i_sb, EXT2_FEATURE_INCOMPAT_FILETYPE)) - de->file_type = ext2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; + de->file_type = fs_umode_to_ftype(inode->i_mode); else de->file_type = 0; } @@ -293,14 +270,14 @@ ext2_readdir(struct file *file, struct dir_context *ctx) unsigned long n = pos >> PAGE_SHIFT; unsigned long npages = dir_pages(inode); unsigned chunk_mask = ~(ext2_chunk_size(inode)-1); - unsigned char *types = NULL; bool need_revalidate = !inode_eq_iversion(inode, file->f_version); + bool has_filetype; if (pos > inode->i_size - EXT2_DIR_REC_LEN(1)) return 0; - if (EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE)) - types = ext2_filetype_table; + has_filetype = + EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE); for ( ; n < npages; n++, offset = 0) { char *kaddr, *limit; @@ -335,8 +312,24 @@ ext2_readdir(struct file *file, struct dir_context *ctx) if (de->inode) { unsigned char d_type = DT_UNKNOWN; - if (types && de->file_type < EXT2_FT_MAX) - d_type = types[de->file_type]; + /* + * compile-time asserts that generic FT_x types + * still match EXT2_FT_x types - no need to list + * for other functions as well as build will + * fail either way + */ + BUILD_BUG_ON(EXT2_FT_UNKNOWN != FT_UNKNOWN); + BUILD_BUG_ON(EXT2_FT_REG_FILE != FT_REG_FILE); + BUILD_BUG_ON(EXT2_FT_DIR != FT_DIR); + BUILD_BUG_ON(EXT2_FT_CHRDEV != FT_CHRDEV); + BUILD_BUG_ON(EXT2_FT_BLKDEV != FT_BLKDEV); + BUILD_BUG_ON(EXT2_FT_FIFO != FT_FIFO); + BUILD_BUG_ON(EXT2_FT_SOCK != FT_SOCK); + BUILD_BUG_ON(EXT2_FT_SYMLINK != FT_SYMLINK); + BUILD_BUG_ON(EXT2_FT_MAX != FT_MAX); + + if (has_filetype) + d_type = fs_dtype(de->file_type); if (!dir_emit(ctx, de->name, de->name_len, le32_to_cpu(de->inode),