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Btrfs: Add support for mirroring across drives

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-03 16:29:03 -04:00
parent 0ef8b2428a
commit 8790d502e4
6 changed files with 198 additions and 93 deletions
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4
fs/btrfs/inode.c
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@@ -306,6 +306,7 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
u64 physical;
u64 length = 0;
u64 map_length;
int total_devs;
struct bio_vec *bvec;
int i;
int ret;
@@ -315,7 +316,8 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
}
map_tree = &root->fs_info->mapping_tree;
map_length = length;
ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
ret = btrfs_map_block(map_tree, READ, 0, logical, &physical,
&map_length, &dev, &total_devs);
if (map_length < length + size) {
return 1;
}