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Subject[RFC][PATCH v2 06/10] ext4: use common file type conversion
Deduplicate the ext4 file type conversion implementation.

Original patch by Amir Goldstein.

v2:
- Rebased against Linux 4.19 by Phillip Potter
- This version does not replace the EXT4_FT_x defines from
fs/ext4/ext4.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>
---
fs/ext4/ext4.h | 35 +++++++++++++++++++----------------
1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index caff935fbeb8..4cb77a2cacdf 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2361,16 +2361,13 @@ static inline void ext4_update_dx_flag(struct inode *inode)
if (!ext4_has_feature_dir_index(inode->i_sb))
ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
}
-static const unsigned char ext4_filetype_table[] = {
- DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
-};

static inline unsigned char get_dtype(struct super_block *sb, int filetype)
{
- if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
+ if (!ext4_has_feature_filetype(sb))
return DT_UNKNOWN;

- return ext4_filetype_table[filetype];
+ return fs_dtype(filetype);
}
extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
void *buf, int buf_size);
@@ -3055,22 +3052,28 @@ extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
extern int ext4_handle_dirty_dirent_node(handle_t *handle,
struct inode *inode,
struct buffer_head *bh);
-#define S_SHIFT 12
-static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
- [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
- [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
- [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
- [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
- [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
- [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
- [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
-};

static inline void ext4_set_de_type(struct super_block *sb,
struct ext4_dir_entry_2 *de,
umode_t mode) {
+ /*
+ * compile-time asserts that generic FT_x types
+ * still match EXT4_FT_x types - no need to list
+ * for other functions as well as build will
+ * fail either way
+ */
+ BUILD_BUG_ON(EXT4_FT_UNKNOWN != FT_UNKNOWN);
+ BUILD_BUG_ON(EXT4_FT_REG_FILE != FT_REG_FILE);
+ BUILD_BUG_ON(EXT4_FT_DIR != FT_DIR);
+ BUILD_BUG_ON(EXT4_FT_CHRDEV != FT_CHRDEV);
+ BUILD_BUG_ON(EXT4_FT_BLKDEV != FT_BLKDEV);
+ BUILD_BUG_ON(EXT4_FT_FIFO != FT_FIFO);
+ BUILD_BUG_ON(EXT4_FT_SOCK != FT_SOCK);
+ BUILD_BUG_ON(EXT4_FT_SYMLINK != FT_SYMLINK);
+ BUILD_BUG_ON(EXT4_FT_MAX != FT_MAX);
+
if (ext4_has_feature_filetype(sb))
- de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
+ de->file_type = fs_umode_to_ftype(mode);
}

/* readpages.c */
--
2.17.2
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