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authorMiao Xie <miaox@cn.fujitsu.com>2011-01-05 10:07:24 +0000
committerChris Mason <chris.mason@oracle.com>2011-01-16 11:30:19 -0500
commit1974a3b42d8cf7a9c74f1e0310c593023617037a (patch)
tree73d7eb8dc071a095fbe424776ab7610dbc897c16 /fs/btrfs
parentd52a5b5f1fa40804f681cf9868d4a8f90661bdf3 (diff)
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/btrfs')
-rw-r--r--fs/btrfs/volumes.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 177b7317959..c50a85e0d08 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);