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Btrfs: Retry metadata reads in the face of checksum failures

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-09 16:28:12 -04:00
parent 22c599485b
commit f188591e98
7 changed files with 138 additions and 52 deletions
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39
fs/btrfs/volumes.c
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@@ -788,9 +788,31 @@ void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
}
}
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len)
{
struct extent_map *em;
struct map_lookup *map;
struct extent_map_tree *em_tree = &map_tree->map_tree;
int ret;
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, len);
BUG_ON(!em);
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
ret = map->num_stripes;
else
ret = 1;
free_extent_map(em);
spin_unlock(&em_tree->lock);
return ret;
}
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret)
struct btrfs_multi_bio **multi_ret, int mirror_num)
{
struct extent_map *em;
struct map_lookup *map;
@@ -822,6 +844,9 @@ again:
map = (struct map_lookup *)em->bdev;
offset = logical - em->start;
if (mirror_num > map->num_stripes)
mirror_num = 0;
/* if our multi bio struct is too small, back off and try again */
if (multi_ret && (rw & (1 << BIO_RW)) &&
stripes_allocated < map->num_stripes &&
@@ -862,7 +887,9 @@ again:
if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
if (rw & (1 << BIO_RW))
multi->num_stripes = map->num_stripes;
else {
else if (mirror_num) {
stripe_index = mirror_num - 1;
} else {
int i;
u64 least = (u64)-1;
struct btrfs_device *cur;
@@ -880,6 +907,8 @@ again:
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (rw & (1 << BIO_RW))
multi->num_stripes = map->num_stripes;
else if (mirror_num)
stripe_index = mirror_num - 1;
} else {
/*
* after this do_div call, stripe_nr is the number of stripes
@@ -938,7 +967,8 @@ static int end_bio_multi_stripe(struct bio *bio,
#endif
}
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio)
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
int mirror_num)
{
struct btrfs_mapping_tree *map_tree;
struct btrfs_device *dev;
@@ -960,7 +990,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio)
map_tree = &root->fs_info->mapping_tree;
map_length = length;
ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi);
ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi,
mirror_num);
BUG_ON(ret);
total_devs = multi->num_stripes;