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btrfs-tree: drop BtrfsFsTreeFetcher and clean up class comments

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BtrfsFsTreeFetcher was used for early versions of the extent scanner, but
neither subvol nor extent scan now needs an object that is both persistent
and configured to access only one subvol.  BtrfsExtentDataFetcher does
the same thing in that case.

Clarify the comments on what the remaining classes do, so that
BtrfsFsTreeFetcher doesn't get inadvertently reinvented in the future.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2025-01-26 14:54:08 -05:00
parent f9a697518d
commit 75040789c6
2 changed files with 5 additions and 16 deletions
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13
include/crucible/btrfs-tree.h
View File

@ -173,30 +173,27 @@ namespace crucible {
void get_sums(uint64_t logical, size_t count, function<void(uint64_t logical, const uint8_t *buf, size_t count)> output);
};
/// Fetch extent items from extent tree
/// Fetch extent items from extent tree.
/// Does not filter out metadata! See BtrfsDataExtentTreeFetcher for that.
class BtrfsExtentItemFetcher : public BtrfsTreeObjectFetcher {
public:
BtrfsExtentItemFetcher(const Fd &fd);
};
/// Fetch extent refs from an inode
/// Fetch extent refs from an inode. Caller must set the tree and objectid.
class BtrfsExtentDataFetcher : public BtrfsTreeOffsetFetcher {
public:
BtrfsExtentDataFetcher(const Fd &fd);
};
/// Fetch inodes from a subvol
class BtrfsFsTreeFetcher : public BtrfsTreeObjectFetcher {
public:
BtrfsFsTreeFetcher(const Fd &fd, uint64_t subvol);
};
/// Fetch raw inode items
class BtrfsInodeFetcher : public BtrfsTreeObjectFetcher {
public:
BtrfsInodeFetcher(const Fd &fd);
BtrfsTreeItem stat(uint64_t subvol, uint64_t inode);
};
/// Fetch a root (subvol) item
class BtrfsRootFetcher : public BtrfsTreeObjectFetcher {
public:
BtrfsRootFetcher(const Fd &fd);

8
lib/btrfs-tree.cc
View File

@ -662,14 +662,6 @@ namespace crucible {
type(BTRFS_EXTENT_DATA_KEY);
}
BtrfsFsTreeFetcher::BtrfsFsTreeFetcher(const Fd &new_fd, uint64_t subvol) :
BtrfsTreeObjectFetcher(new_fd)
{
tree(subvol);
type(BTRFS_EXTENT_DATA_KEY);
scale_size(1);
}
BtrfsInodeFetcher::BtrfsInodeFetcher(const Fd &fd) :
BtrfsTreeObjectFetcher(fd)
{