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author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-12-15 14:13:48 -0500 |
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committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-01-01 11:47:44 -0500 |
commit | d296e7b18521d60e3c428945c19a66ecf012c002 (patch) | |
tree | 09de01a31624a56caa6fab1e1b23c9da6be07ad1 /fs/bcachefs/fsck.c | |
parent | c558c577cbea95d8a8efc161cad93bab344a61d0 (diff) | |
download | linux-d296e7b18521d60e3c428945c19a66ecf012c002.tar.gz linux-d296e7b18521d60e3c428945c19a66ecf012c002.tar.bz2 linux-d296e7b18521d60e3c428945c19a66ecf012c002.zip |
bcachefs: Fix reattach_inode() for snapshots
reattach_inode() was broken w.r.t. snapshots - we'd lookup the subvolume
to look up lost+found, but if we're in an interior node snapshot that
didn't make any sense.
Instead, this adds a dirent path for creating in a specific snapshot,
skipping the subvolume; and we also make sure to create lost+found in
the root snapshot, to avoid conflicts with lost+found being created in
overlapping snapshots.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/fsck.c')
-rw-r--r-- | fs/bcachefs/fsck.c | 106 |
1 files changed, 60 insertions, 46 deletions
diff --git a/fs/bcachefs/fsck.c b/fs/bcachefs/fsck.c index 796e1a8447d6..dc825b14f24e 100644 --- a/fs/bcachefs/fsck.c +++ b/fs/bcachefs/fsck.c @@ -59,21 +59,6 @@ static s64 bch2_count_subdirs(struct btree_trans *trans, u64 inum, return ret ?: subdirs; } -static int __snapshot_lookup_subvol(struct btree_trans *trans, u32 snapshot, - u32 *subvol) -{ - struct bch_snapshot s; - int ret = bch2_bkey_get_val_typed(trans, BTREE_ID_snapshots, - POS(0, snapshot), 0, - snapshot, &s); - if (!ret) - *subvol = le32_to_cpu(s.subvol); - else if (bch2_err_matches(ret, ENOENT)) - bch_err(trans->c, "snapshot %u not found", snapshot); - return ret; - -} - static int __subvol_lookup(struct btree_trans *trans, u32 subvol, u32 *snapshot, u64 *inum) { @@ -227,35 +212,42 @@ err: } /* Get lost+found, create if it doesn't exist: */ -static int lookup_lostfound(struct btree_trans *trans, u32 subvol, +static int lookup_lostfound(struct btree_trans *trans, u32 snapshot, struct bch_inode_unpacked *lostfound) { struct bch_fs *c = trans->c; - struct bch_inode_unpacked root; - struct bch_hash_info root_hash_info; struct qstr lostfound_str = QSTR("lost+found"); - subvol_inum root_inum = { .subvol = subvol }; u64 inum = 0; unsigned d_type = 0; - u32 snapshot; int ret; - ret = __subvol_lookup(trans, subvol, &snapshot, &root_inum.inum); + struct bch_snapshot_tree st; + ret = bch2_snapshot_tree_lookup(trans, + bch2_snapshot_tree(c, snapshot), &st); if (ret) return ret; - ret = __lookup_inode(trans, root_inum.inum, &root, &snapshot); + subvol_inum root_inum = { .subvol = le32_to_cpu(st.master_subvol) }; + u32 subvol_snapshot; + + ret = __subvol_lookup(trans, le32_to_cpu(st.master_subvol), + &subvol_snapshot, &root_inum.inum); + bch_err_msg(c, ret, "looking up root subvol"); if (ret) return ret; - root_hash_info = bch2_hash_info_init(c, &root); + struct bch_inode_unpacked root_inode; + struct bch_hash_info root_hash_info; + ret = __lookup_inode(trans, root_inum.inum, &root_inode, &snapshot); + if (ret) + return ret; + + root_hash_info = bch2_hash_info_init(c, &root_inode); ret = __lookup_dirent(trans, root_hash_info, root_inum, - &lostfound_str, &inum, &d_type); - if (bch2_err_matches(ret, ENOENT)) { - bch_notice(c, "creating lost+found"); + &lostfound_str, &inum, &d_type); + if (bch2_err_matches(ret, ENOENT)) goto create_lostfound; - } bch_err_fn(c, ret); if (ret) @@ -273,13 +265,43 @@ static int lookup_lostfound(struct btree_trans *trans, u32 subvol, return __lookup_inode(trans, inum, lostfound, &snapshot); create_lostfound: + /* + * XXX: we could have a nicer log message here if we had a nice way to + * walk backpointers to print a path + */ + bch_notice(c, "creating lost+found in snapshot %u", le32_to_cpu(st.root_snapshot)); + + u64 now = bch2_current_time(c); + struct btree_iter lostfound_iter = { NULL }; + u64 cpu = raw_smp_processor_id(); + bch2_inode_init_early(c, lostfound); + bch2_inode_init_late(lostfound, now, 0, 0, S_IFDIR|0700, 0, &root_inode); + lostfound->bi_dir = root_inode.bi_inum; + + root_inode.bi_nlink++; + + ret = bch2_inode_create(trans, &lostfound_iter, lostfound, snapshot, cpu); + if (ret) + goto err; - ret = bch2_create_trans(trans, root_inum, &root, - lostfound, &lostfound_str, - 0, 0, S_IFDIR|0700, 0, NULL, NULL, - (subvol_inum) { }, 0); + bch2_btree_iter_set_snapshot(&lostfound_iter, snapshot); + ret = bch2_btree_iter_traverse(&lostfound_iter); + if (ret) + goto err; + + ret = bch2_dirent_create_snapshot(trans, + root_inode.bi_inum, snapshot, &root_hash_info, + mode_to_type(lostfound->bi_mode), + &lostfound_str, + lostfound->bi_inum, + &lostfound->bi_dir_offset, + BCH_HASH_SET_MUST_CREATE) ?: + bch2_inode_write_flags(trans, &lostfound_iter, lostfound, + BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE); +err: bch_err_msg(c, ret, "creating lost+found"); + bch2_trans_iter_exit(trans, &lostfound_iter); return ret; } @@ -292,14 +314,9 @@ static int __reattach_inode(struct btree_trans *trans, char name_buf[20]; struct qstr name; u64 dir_offset = 0; - u32 subvol; int ret; - ret = __snapshot_lookup_subvol(trans, inode_snapshot, &subvol); - if (ret) - return ret; - - ret = lookup_lostfound(trans, subvol, &lostfound); + ret = lookup_lostfound(trans, inode_snapshot, &lostfound); if (ret) return ret; @@ -316,15 +333,12 @@ static int __reattach_inode(struct btree_trans *trans, snprintf(name_buf, sizeof(name_buf), "%llu", inode->bi_inum); name = (struct qstr) QSTR(name_buf); - ret = bch2_dirent_create(trans, - (subvol_inum) { - .subvol = subvol, - .inum = lostfound.bi_inum, - }, - &dir_hash, - inode_d_type(inode), - &name, inode->bi_inum, &dir_offset, - BCH_HASH_SET_MUST_CREATE); + ret = bch2_dirent_create_snapshot(trans, + lostfound.bi_inum, inode_snapshot, + &dir_hash, + inode_d_type(inode), + &name, inode->bi_inum, &dir_offset, + BCH_HASH_SET_MUST_CREATE); if (ret) return ret; |