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| author | Miao Xie <miaox@cn.fujitsu.com> | 2011-01-05 10:07:24 +0000 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-01-16 11:30:19 -0500 |
| commit | 1974a3b42d8cf7a9c74f1e0310c593023617037a (patch) | |
| tree | 73d7eb8dc071a095fbe424776ab7610dbc897c16 /fs | |
| parent | d52a5b5f1fa40804f681cf9868d4a8f90661bdf3 (diff) | |
| download | op-kernel-dev-1974a3b42d8cf7a9c74f1e0310c593023617037a.zip op-kernel-dev-1974a3b42d8cf7a9c74f1e0310c593023617037a.tar.gz | |
btrfs: fix wrong calculation of stripe size
There are two tiny problem:
- One is When we check the chunk size is greater than the max chunk size or not,
we should take mirrors into account, but the original code didn't.
- The other is btrfs shouldn't use the size of the residual free space as the
length of of a dup chunk when doing chunk allocation. It is because the device
space that a dup chunk needs is twice as large as the chunk size, if we use
the size of the residual free space as the length of a dup chunk, we can not
get enough free space. Fix it.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/volumes.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 177b731..c50a85e 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2177,6 +2177,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, int num_stripes = 1; int min_stripes = 1; int sub_stripes = 0; + int ncopies = 1; int looped = 0; int ret; int index; @@ -2197,12 +2198,14 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, if (type & (BTRFS_BLOCK_GROUP_DUP)) { num_stripes = 2; min_stripes = 2; + ncopies = 2; } if (type & (BTRFS_BLOCK_GROUP_RAID1)) { if (fs_devices->rw_devices < 2) return -ENOSPC; num_stripes = 2; min_stripes = 2; + ncopies = 2; } if (type & (BTRFS_BLOCK_GROUP_RAID10)) { num_stripes = fs_devices->rw_devices; @@ -2210,6 +2213,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, return -ENOSPC; num_stripes &= ~(u32)1; sub_stripes = 2; + ncopies = 2; min_stripes = 4; } @@ -2239,8 +2243,8 @@ again: map->num_stripes = num_stripes; } - if (calc_size * num_stripes > max_chunk_size) { - calc_size = max_chunk_size; + if (calc_size * num_stripes > max_chunk_size * ncopies) { + calc_size = max_chunk_size * ncopies; do_div(calc_size, num_stripes); do_div(calc_size, stripe_len); calc_size *= stripe_len; @@ -2321,6 +2325,8 @@ again: if (!looped && max_avail > 0) { looped = 1; calc_size = max_avail; + if (type & BTRFS_BLOCK_GROUP_DUP) + do_div(calc_size, 2); goto again; } kfree(map); |
