From: Nikolay Borisov <nborisov@suse.com>
To: linux-btrfs@vger.kernel.org
Cc: Nikolay Borisov <nborisov@suse.com>
Subject: [PATCH v2 5/8] btrfs-progs: Add btrfs_uuid_tree_remove
Date: Tue, 14 Sep 2021 12:05:55 +0300 [thread overview]
Message-ID: <20210914090558.79411-6-nborisov@suse.com> (raw)
In-Reply-To: <20210914090558.79411-1-nborisov@suse.com>
It will be used to clear received data on RW snapshots that were
received.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
kernel-shared/ctree.h | 3 ++
kernel-shared/uuid-tree.c | 82 +++++++++++++++++++++++++++++++++++++++
2 files changed, 85 insertions(+)
diff --git a/kernel-shared/ctree.h b/kernel-shared/ctree.h
index 91a85796a678..158281a9fd67 100644
--- a/kernel-shared/ctree.h
+++ b/kernel-shared/ctree.h
@@ -2860,6 +2860,9 @@ int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
u64 subvol_id_cpu);
int btrfs_is_empty_uuid(u8 *uuid);
+int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+ u64 subid);
+
static inline int is_fstree(u64 rootid)
{
diff --git a/kernel-shared/uuid-tree.c b/kernel-shared/uuid-tree.c
index 51a7b5d9ff5d..0f0fbf667dda 100644
--- a/kernel-shared/uuid-tree.c
+++ b/kernel-shared/uuid-tree.c
@@ -120,3 +120,85 @@ int btrfs_is_empty_uuid(u8 *uuid)
}
return 1;
}
+
+int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+ u64 subid)
+{
+ struct btrfs_fs_info *fs_info = trans->fs_info;
+ struct btrfs_root *uuid_root = fs_info->uuid_root;
+ int ret;
+ struct btrfs_path *path = NULL;
+ struct btrfs_key key;
+ struct extent_buffer *eb;
+ int slot;
+ unsigned long offset;
+ u32 item_size;
+ unsigned long move_dst;
+ unsigned long move_src;
+ unsigned long move_len;
+
+ if (!uuid_root) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ btrfs_uuid_to_key(uuid, &key);
+ key.type = type;
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = btrfs_search_slot(trans, uuid_root, &key, path, -1, 1);
+ if (ret < 0) {
+ warning("error %d while searching for uuid item!", ret);
+ goto out;
+ }
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ offset = btrfs_item_ptr_offset(eb, slot);
+ item_size = btrfs_item_size_nr(eb, slot);
+ if (!IS_ALIGNED(item_size, sizeof(u64))) {
+ warning("uuid item with illegal size %lu!", (unsigned long)item_size);
+ ret = -ENOENT;
+ goto out;
+ }
+ while (item_size) {
+ __le64 read_subid;
+
+ read_extent_buffer(eb, &read_subid, offset, sizeof(read_subid));
+ if (le64_to_cpu(read_subid) == subid)
+ break;
+ offset += sizeof(read_subid);
+ item_size -= sizeof(read_subid);
+ }
+
+ if (!item_size) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ item_size = btrfs_item_size_nr(eb, slot);
+ if (item_size == sizeof(subid)) {
+ ret = btrfs_del_item(trans, uuid_root, path);
+ goto out;
+ }
+
+ move_dst = offset;
+ move_src = offset + sizeof(subid);
+ move_len = item_size - (move_src - btrfs_item_ptr_offset(eb, slot));
+ memmove_extent_buffer(eb, move_dst, move_src, move_len);
+ btrfs_truncate_item(path, item_size - sizeof(subid), 1);
+
+out:
+ btrfs_free_path(path);
+ return ret;
+}
--
2.17.1
next prev parent reply other threads:[~2021-09-14 9:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 9:05 [PATCH v2 0/8] Implement progs support for removing received uuid on RW vols Nikolay Borisov
2021-09-14 9:05 ` [PATCH v2 1/8] btrfs-progs: Add btrfs_is_empty_uuid Nikolay Borisov
2021-09-16 7:26 ` Anand Jain
2021-09-20 11:41 ` David Sterba
2021-09-14 9:05 ` [PATCH v2 2/8] btrfs-progs: Remove root argument from btrfs_fixup_low_keys Nikolay Borisov
2021-09-14 9:05 ` [PATCH v2 3/8] btrfs-progs: Remove fs_info argument from leaf_data_end Nikolay Borisov
2021-09-14 9:05 ` [PATCH v2 4/8] btrfs-progs: Remove root argument from btrfs_truncate_item Nikolay Borisov
2021-09-14 9:05 ` Nikolay Borisov [this message]
2021-09-14 9:22 ` [PATCH v2 5/8] btrfs-progs: Add btrfs_uuid_tree_remove Qu Wenruo
2021-09-14 9:05 ` [PATCH v2 6/8] btrfs-progs: Implement helper to remove received information of RW subvol Nikolay Borisov
2021-09-14 9:23 ` Qu Wenruo
2021-09-14 9:05 ` [PATCH v2 7/8] btrfs-progs: check: Implement removing received data for RW subvols Nikolay Borisov
2021-09-14 9:25 ` Qu Wenruo
2021-09-14 9:55 ` Nikolay Borisov
2021-09-14 9:05 ` [PATCH v2 8/8] btrfs-progs: tests: Add test for received information removal Nikolay Borisov
2021-09-14 9:30 ` [PATCH v2 0/8] Implement progs support for removing received uuid on RW vols Qu Wenruo
2021-09-14 9:30 ` Qu Wenruo
2021-09-14 9:31 ` Nikolay Borisov
2021-09-21 18:51 ` David Sterba
2021-09-21 22:08 ` Graham Cobb
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