From e4837f8f3b5d08b8c708533a71439bfb40ede467 Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Tue, 27 Mar 2012 17:09:17 +0300 Subject: [PATCH] Btrfs: allow dup for data chunks in mixed mode Generally we don't allow dup for data, but mixed chunks are special and people seem to think this has its use cases. Signed-off-by: Ilya Dryomov --- fs/btrfs/volumes.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 28addea..bcc0acd 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2650,6 +2650,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl, { struct btrfs_fs_info *fs_info = bctl->fs_info; u64 allowed; + int mixed = 0; int ret; if (btrfs_fs_closing(fs_info) || @@ -2659,13 +2660,16 @@ int btrfs_balance(struct btrfs_balance_control *bctl, goto out; } + allowed = btrfs_super_incompat_flags(fs_info->super_copy); + if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) + mixed = 1; + /* * In case of mixed groups both data and meta should be picked, * and identical options should be given for both of them. */ - allowed = btrfs_super_incompat_flags(fs_info->super_copy); - if ((allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && - (bctl->flags & (BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA))) { + allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA; + if (mixed && (bctl->flags & allowed)) { if (!(bctl->flags & BTRFS_BALANCE_DATA) || !(bctl->flags & BTRFS_BALANCE_METADATA) || memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) { @@ -2713,7 +2717,8 @@ int btrfs_balance(struct btrfs_balance_control *bctl, goto out; } - if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && + /* allow dup'ed data chunks only in mixed mode */ + if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) { printk(KERN_ERR "btrfs: dup for data is not allowed\n"); ret = -EINVAL; -- 2.7.4