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Btrfs: Deal with failed writes in mirrored configurations 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-29 09:38:00 -04:00
parent 4235298e4f
commit a236aed14c
4 changed files with 33 additions and 8 deletions
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17
fs/btrfs/disk-io.c
View File

@ -1385,7 +1385,10 @@ int write_all_supers(struct btrfs_root *root)
struct buffer_head *bh;
int ret;
int do_barriers;
int max_errors;
int total_errors = 0;
max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
do_barriers = !btrfs_test_opt(root, NOBARRIER);
sb = root->fs_info->sb_buffer;
@ -1433,8 +1436,14 @@ int write_all_supers(struct btrfs_root *root)
} else {
ret = submit_bh(WRITE, bh);
}
BUG_ON(ret);
if (ret)
total_errors++;
}
if (total_errors > max_errors) {
printk("btrfs: %d errors while writing supers\n", total_errors);
BUG();
}
total_errors = 0;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
@ -1454,13 +1463,17 @@ int write_all_supers(struct btrfs_root *root)
wait_on_buffer(bh);
BUG_ON(!buffer_uptodate(bh));
} else {
BUG();
total_errors++;
}
}
dev->pending_io = NULL;
brelse(bh);
}
if (total_errors > max_errors) {
printk("btrfs: %d errors while writing supers\n", total_errors);
BUG();
}
return 0;
}

4
fs/btrfs/extent-tree.c
View File

@ -315,8 +315,8 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
block_group_cache = &info->block_group_cache;
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
if (!owner)
factor = 10;
if (data & BTRFS_BLOCK_GROUP_METADATA)
factor = 9;
bit = block_group_state_bits(data);

17
fs/btrfs/volumes.c
View File

@ -1425,6 +1425,7 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
int stripe_index;
int i;
int num_stripes;
int max_errors = 0;
struct btrfs_multi_bio *multi = NULL;
if (multi_ret && !(rw & (1 << BIO_RW))) {
@ -1436,6 +1437,8 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
GFP_NOFS);
if (!multi)
return -ENOMEM;
atomic_set(&multi->error, 0);
}
spin_lock(&em_tree->lock);
@ -1462,8 +1465,10 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_DUP)) {
stripes_required = map->num_stripes;
max_errors = 1;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
stripes_required = map->sub_stripes;
max_errors = 1;
}
}
if (multi_ret && rw == WRITE &&
@ -1561,6 +1566,7 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
if (multi_ret) {
*multi_ret = multi;
multi->num_stripes = num_stripes;
multi->max_errors = max_errors;
}
out:
free_extent_map(em);
@ -1598,14 +1604,19 @@ static int end_bio_multi_stripe(struct bio *bio,
return 1;
#endif
if (err)
multi->error = err;
atomic_inc(&multi->error);
if (atomic_dec_and_test(&multi->stripes_pending)) {
bio->bi_private = multi->private;
bio->bi_end_io = multi->end_io;
if (!err && multi->error)
err = multi->error;
/* only send an error to the higher layers if it is
* beyond the tolerance of the multi-bio
*/
if (atomic_read(&multi->error) > multi->max_errors)
err = -EIO;
else
err = 0;
kfree(multi);
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)

3
fs/btrfs/volumes.h
View File

@ -90,7 +90,8 @@ struct btrfs_multi_bio {
atomic_t stripes_pending;
bio_end_io_t *end_io;
void *private;
int error;
atomic_t error;
int max_errors;
int num_stripes;
struct btrfs_bio_stripe stripes[];
};