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hash: handle $BEESHOME on non-btrfs

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bees explicitly supports storing $BEESHOME on another filesystem, and
does not require that filesystem to be btrfs; however, if $BEESHOME
is on a non-btrfs filesystem, there is an exception on every startup
when trying to identify the subvol root of the hash table file in order
to blacklist it, because non-btrfs filesystems don't have subvol roots.

Fix by checking not only whether $BEESHOME is on btrfs, but whether it
is on the _same_ btrfs, as the bees root, without throwing an exception.
The hash table is blacklisted only when both filesystems are btrfs and
have the same fsid.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2025-01-26 21:59:07 -05:00
parent 925b12823e
commit f6908420ad
1 changed files with 11 additions and 1 deletions
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12
src/bees-hash.cc
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@ -811,8 +811,18 @@ BeesHashTable::BeesHashTable(shared_ptr<BeesContext> ctx, string filename, off_t
prefetch_loop();
});
// Blacklist might fail if the hash table is not stored on a btrfs
// Blacklist might fail if the hash table is not stored on a btrfs,
// or if it's on a _different_ btrfs
catch_all([&]() {
// Root is definitely a btrfs
BtrfsIoctlFsInfoArgs root_info;
root_info.do_ioctl(m_ctx->root_fd());
// Hash might not be a btrfs
BtrfsIoctlFsInfoArgs hash_info;
if (hash_info.do_ioctl_nothrow(m_fd)) return;
// If Hash is a btrfs, Root must be the same one
if (root_info.fsid() != hash_info.fsid()) return;
// Hash is on the same one, blacklist it
m_ctx->blacklist_insert(BeesFileId(m_fd));
});
}