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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

Common implementation can be found via commit:
bbe7449e25 "fs: common implementation of file type"

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Phillip Potter 2019-03-26 21:39:34 +00:00 committed by David Sterba
parent 7984ae52bb
commit 7d157c3d48
4 changed files with 18 additions and 20 deletions
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2
fs/btrfs/btrfs_inode.h
View File

@ -203,8 +203,6 @@ 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);

2
fs/btrfs/delayed-inode.c
View File

@ -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, &di->location);
over = !dir_emit(ctx, name, name_len,

32
fs/btrfs/inode.c
View File

@ -73,17 +73,6 @@ 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);
@ -5797,10 +5786,6 @@ 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
@ -5939,7 +5924,7 @@ 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)),
&entry->type);
btrfs_dir_item_key_to_cpu(leaf, di, &location);
put_unaligned(location.objectid, &entry->ino);
@ -6344,7 +6329,20 @@ 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_* types still match
* BTRFS_FT_* 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);
}
/*

2
include/uapi/linux/btrfs_tree.h
View File

@ -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