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Btrfs: Handle write errors on raid1 and raid10

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When duplicate copies exist, writes are allowed to fail to one of those
copies.  This changeset includes a few changes that allow the FS to
continue even when some IOs fail.

It also adds verification of the parent generation number for btree blocks.
This generation is stored in the pointer to a block, and it ensures
that missed writes to are detected.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-05-12 13:39:03 -04:00
parent ca7a79ad8d
commit 1259ab75c6
9 changed files with 155 additions and 49 deletions
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7
fs/btrfs/tree-defrag.c
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@@ -51,6 +51,7 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
struct extent_buffer *next;
struct extent_buffer *cur;
u64 bytenr;
u64 ptr_gen;
int ret = 0;
int is_extent = 0;
@@ -93,11 +94,12 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
break;
}
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
if (cache_only) {
next = btrfs_find_tree_block(root, bytenr,
btrfs_level_size(root, *level - 1));
if (!next || !btrfs_buffer_uptodate(next) ||
if (!next || !btrfs_buffer_uptodate(next, ptr_gen) ||
!btrfs_buffer_defrag(next)) {
free_extent_buffer(next);
path->slots[*level]++;
@@ -106,8 +108,7 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
} else {
next = read_tree_block(root, bytenr,
btrfs_level_size(root, *level - 1),
btrfs_node_ptr_generation(cur,
path->slots[*level]));
ptr_gen);
}
ret = btrfs_cow_block(trans, root, next, path->nodes[*level],
path->slots[*level], &next);