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btrfs-progs: check/lowmem: add inode transid detect and repair support 

There are quite some reports on kernel rejecting invalid inode
generation, but it turns out to be that, kernel is just rejecting inode
transid. It's a bug in kernel error message.

To solve the problem and make the fs mountable again, add the detect and
repair support for lowmem mode.

The implementation is pretty much the same, just re-use the existing
inode generation detect and repair code.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-08-26 08:52:31 +08:00 committed by David Sterba
parent c655b5e4b1
commit ce2dcb3615
1 changed files with 7 additions and 4 deletions
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11
check/mode-lowmem.c
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@ -2554,6 +2554,7 @@ static int repair_inode_gen_lowmem(struct btrfs_root *root,
ii = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_inode_item);
btrfs_set_inode_generation(path->nodes[0], ii, trans->transid);
btrfs_set_inode_transid(path->nodes[0], ii, trans->transid);
btrfs_mark_buffer_dirty(path->nodes[0]);
ret = btrfs_commit_transaction(trans, root);
if (ret < 0) {
@ -2561,7 +2562,7 @@ static int repair_inode_gen_lowmem(struct btrfs_root *root,
error("failed to commit transaction: %m");
goto error;
}
printf("resetting inode generation to %llu for ino %llu\n",
printf("resetting inode generation/transid to %llu for ino %llu\n",
transid, key.objectid);
return ret;
@ -2597,6 +2598,7 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
u64 extent_end = 0;
u64 extent_size = 0;
u64 generation;
u64 transid;
u64 gen_uplimit;
unsigned int dir;
unsigned int nodatasum;
@ -2629,6 +2631,7 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
dir = imode_to_type(mode) == BTRFS_FT_DIR;
nlink = btrfs_inode_nlink(node, ii);
generation = btrfs_inode_generation(node, ii);
transid = btrfs_inode_transid(node, ii);
nodatasum = btrfs_inode_flags(node, ii) & BTRFS_INODE_NODATASUM;
if (!is_valid_imode(mode)) {
@ -2648,10 +2651,10 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
else
gen_uplimit = btrfs_super_generation(super);
if (generation > gen_uplimit) {
if (generation > gen_uplimit || transid > gen_uplimit) {
error(
"invalid inode generation for ino %llu, have %llu expect [0, %llu)",
inode_id, generation, gen_uplimit);
"invalid inode generation %llu or transid %llu for ino %llu, expect [0, %llu)",
generation, transid, inode_id, gen_uplimit);
if (repair) {
ret = repair_inode_gen_lowmem(root, path);
if (ret < 0)