Re: [RFC][PATCH v4 09/09] btrfs: use common file type conversion
On Wed 21-11-18 19:07:06, Phillip Potter wrote:
> Deduplicate the btrfs file type conversion implementation - file systems
> that use the same file types as defined by POSIX do not need to define
> their own versions and can use the common helper functions decared in
> fs_types.h and implemented in fs_types.c
>
> Acked-by: David Sterba
> Signed-off-by: Amir Goldstein
> Signed-off-by: Phillip Potter
The patch looks good. You can add:
Reviewed-by: Jan Kara
Honza
> ---
> fs/btrfs/btrfs_inode.h | 2 --
> fs/btrfs/delayed-inode.c| 2 +-
> fs/btrfs/inode.c| 32 +++-
> include/uapi/linux/btrfs_tree.h | 2 ++
> 4 files changed, 18 insertions(+), 20 deletions(-)
>
> diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
> index 97d91e55b70a..bb01c804485f 100644
> --- a/fs/btrfs/btrfs_inode.h
> +++ b/fs/btrfs/btrfs_inode.h
> @@ -196,8 +196,6 @@ struct btrfs_inode {
> struct inode vfs_inode;
> };
>
> -extern unsigned char btrfs_filetype_table[];
> -
> static inline struct btrfs_inode *BTRFS_I(const struct inode *inode)
> {
> return container_of(inode, struct btrfs_inode, vfs_inode);
> diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
> index c669f250d4a0..e61947f5eb76 100644
> --- a/fs/btrfs/delayed-inode.c
> +++ b/fs/btrfs/delayed-inode.c
> @@ -1692,7 +1692,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context
> *ctx,
> name = (char *)(di + 1);
> name_len = btrfs_stack_dir_name_len(di);
>
> - d_type = btrfs_filetype_table[di->type];
> + d_type = fs_ftype_to_dtype(di->type);
> btrfs_disk_key_to_cpu(, >location);
>
> over = !dir_emit(ctx, name, name_len,
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 9ea4c6f0352f..8b7b1b29e2ad 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -72,17 +72,6 @@ struct kmem_cache *btrfs_trans_handle_cachep;
> struct kmem_cache *btrfs_path_cachep;
> struct kmem_cache *btrfs_free_space_cachep;
>
> -#define S_SHIFT 12
> -static const unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
> - [S_IFREG >> S_SHIFT]= BTRFS_FT_REG_FILE,
> - [S_IFDIR >> S_SHIFT]= BTRFS_FT_DIR,
> - [S_IFCHR >> S_SHIFT]= BTRFS_FT_CHRDEV,
> - [S_IFBLK >> S_SHIFT]= BTRFS_FT_BLKDEV,
> - [S_IFIFO >> S_SHIFT]= BTRFS_FT_FIFO,
> - [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
> - [S_IFLNK >> S_SHIFT]= BTRFS_FT_SYMLINK,
> -};
> -
> static int btrfs_setsize(struct inode *inode, struct iattr *attr);
> static int btrfs_truncate(struct inode *inode, bool skip_writeback);
> static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
> *ordered_extent);
> @@ -5793,10 +5782,6 @@ static struct dentry *btrfs_lookup(struct inode *dir,
> struct dentry *dentry,
> return d_splice_alias(inode, dentry);
> }
>
> -unsigned char btrfs_filetype_table[] = {
> - DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
> -};
> -
> /*
> * All this infrastructure exists because dir_emit can fault, and we are
> holding
> * the tree lock when doing readdir. For now just allocate a buffer and copy
> @@ -5935,7 +5920,7 @@ static int btrfs_real_readdir(struct file *file, struct
> dir_context *ctx)
> name_ptr = (char *)(entry + 1);
> read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
> name_len);
> - put_unaligned(btrfs_filetype_table[btrfs_dir_type(leaf, di)],
> + put_unaligned(fs_ftype_to_dtype(btrfs_dir_type(leaf, di)),
> >type);
> btrfs_dir_item_key_to_cpu(leaf, di, );
> put_unaligned(location.objectid, >ino);
> @@ -6340,7 +6325,20 @@ static struct inode *btrfs_new_inode(struct
> btrfs_trans_handle *trans,
>
> static inline u8 btrfs_inode_type(struct inode *inode)
> {
> - return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
> + /*
> + * compile-time asserts that generic FT_x types still match
> + * BTRFS_FT_x types
> + */
> + BUILD_BUG_ON(BTRFS_FT_UNKNOWN != FT_UNKNOWN);
> + BUILD_BUG_ON(BTRFS_FT_REG_FILE != FT_REG_FILE);
> + BUILD_BUG_ON(BTRFS_FT_DIR != FT_DIR);
> + BUILD_BUG_ON(BTRFS_FT_CHRDEV != FT_CHRDEV);
> + BUILD_BUG_ON(BTRFS_FT_BLKDEV != FT_BLKDEV);
> + BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO);
> + BUILD_BUG_ON(BTRFS_FT_SOCK != FT_SOCK);
> + BUILD_BUG_ON(BTRFS_FT_SYMLINK != FT_SYMLINK);
> +
> + return fs_umode_to_ftype(inode->i_mode);
> }
>
> /*
> diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
> index aff1356c2bb8..4126ed7ee89a 100644
> --- a/include/uapi/linux/btrfs_tree.h
> +++ b/include/uapi/linux/btrfs_tree.h
> @@ -307,6 +307,8 @@
> *
> * Used by:
> * struct btrfs_dir_item.type
> + *
> + * Values
[RFC][PATCH v4 09/09] btrfs: use common file type conversion
Deduplicate the btrfs file type conversion implementation - file systems
that use the same file types as defined by POSIX do not need to define
their own versions and can use the common helper functions decared in
fs_types.h and implemented in fs_types.c
Acked-by: David Sterba
Signed-off-by: Amir Goldstein
Signed-off-by: Phillip Potter
---
fs/btrfs/btrfs_inode.h | 2 --
fs/btrfs/delayed-inode.c| 2 +-
fs/btrfs/inode.c| 32 +++-
include/uapi/linux/btrfs_tree.h | 2 ++
4 files changed, 18 insertions(+), 20 deletions(-)
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 97d91e55b70a..bb01c804485f 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -196,8 +196,6 @@ struct btrfs_inode {
struct inode vfs_inode;
};
-extern unsigned char btrfs_filetype_table[];
-
static inline struct btrfs_inode *BTRFS_I(const struct inode *inode)
{
return container_of(inode, struct btrfs_inode, vfs_inode);
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index c669f250d4a0..e61947f5eb76 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1692,7 +1692,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context
*ctx,
name = (char *)(di + 1);
name_len = btrfs_stack_dir_name_len(di);
- d_type = btrfs_filetype_table[di->type];
+ d_type = fs_ftype_to_dtype(di->type);
btrfs_disk_key_to_cpu(, >location);
over = !dir_emit(ctx, name, name_len,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 9ea4c6f0352f..8b7b1b29e2ad 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -72,17 +72,6 @@ struct kmem_cache *btrfs_trans_handle_cachep;
struct kmem_cache *btrfs_path_cachep;
struct kmem_cache *btrfs_free_space_cachep;
-#define S_SHIFT 12
-static const unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
- [S_IFREG >> S_SHIFT]= BTRFS_FT_REG_FILE,
- [S_IFDIR >> S_SHIFT]= BTRFS_FT_DIR,
- [S_IFCHR >> S_SHIFT]= BTRFS_FT_CHRDEV,
- [S_IFBLK >> S_SHIFT]= BTRFS_FT_BLKDEV,
- [S_IFIFO >> S_SHIFT]= BTRFS_FT_FIFO,
- [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
- [S_IFLNK >> S_SHIFT]= BTRFS_FT_SYMLINK,
-};
-
static int btrfs_setsize(struct inode *inode, struct iattr *attr);
static int btrfs_truncate(struct inode *inode, bool skip_writeback);
static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent);
@@ -5793,10 +5782,6 @@ static struct dentry *btrfs_lookup(struct inode *dir,
struct dentry *dentry,
return d_splice_alias(inode, dentry);
}
-unsigned char btrfs_filetype_table[] = {
- DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
-};
-
/*
* All this infrastructure exists because dir_emit can fault, and we are
holding
* the tree lock when doing readdir. For now just allocate a buffer and copy
@@ -5935,7 +5920,7 @@ static int btrfs_real_readdir(struct file *file, struct
dir_context *ctx)
name_ptr = (char *)(entry + 1);
read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
name_len);
- put_unaligned(btrfs_filetype_table[btrfs_dir_type(leaf, di)],
+ put_unaligned(fs_ftype_to_dtype(btrfs_dir_type(leaf, di)),
>type);
btrfs_dir_item_key_to_cpu(leaf, di, );
put_unaligned(location.objectid, >ino);
@@ -6340,7 +6325,20 @@ static struct inode *btrfs_new_inode(struct
btrfs_trans_handle *trans,
static inline u8 btrfs_inode_type(struct inode *inode)
{
- return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
+ /*
+* compile-time asserts that generic FT_x types still match
+* BTRFS_FT_x types
+*/
+ BUILD_BUG_ON(BTRFS_FT_UNKNOWN != FT_UNKNOWN);
+ BUILD_BUG_ON(BTRFS_FT_REG_FILE != FT_REG_FILE);
+ BUILD_BUG_ON(BTRFS_FT_DIR != FT_DIR);
+ BUILD_BUG_ON(BTRFS_FT_CHRDEV != FT_CHRDEV);
+ BUILD_BUG_ON(BTRFS_FT_BLKDEV != FT_BLKDEV);
+ BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO);
+ BUILD_BUG_ON(BTRFS_FT_SOCK != FT_SOCK);
+ BUILD_BUG_ON(BTRFS_FT_SYMLINK != FT_SYMLINK);
+
+ return fs_umode_to_ftype(inode->i_mode);
}
/*
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index aff1356c2bb8..4126ed7ee89a 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -307,6 +307,8 @@
*
* Used by:
* struct btrfs_dir_item.type
+ *
+ * Values 0..7 must match common file type values in fs_types.h.
*/
#define BTRFS_FT_UNKNOWN 0
#define BTRFS_FT_REG_FILE 1
--
2.19.1
