62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include "kernel-shared/ctree.h"
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#include "kernel-shared/transaction.h"
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#include "common/messages.h"
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int update_seeding_flag(struct btrfs_root *root, const char *device, int set_flag, int force)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_super_block *disk_super;
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u64 super_flags;
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int ret;
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disk_super = root->fs_info->super_copy;
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super_flags = btrfs_super_flags(disk_super);
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if (set_flag) {
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if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
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if (force)
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return 0;
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else
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warning("seeding flag is already set on %s",
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device);
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return 1;
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}
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if (btrfs_super_log_root(disk_super)) {
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error("filesystem with dirty log detected, not setting seed flag");
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return 1;
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}
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super_flags |= BTRFS_SUPER_FLAG_SEEDING;
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} else {
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if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) {
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warning("seeding flag is not set on %s", device);
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return 1;
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}
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super_flags &= ~BTRFS_SUPER_FLAG_SEEDING;
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warning("seeding flag cleared on %s", device);
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}
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(IS_ERR(trans));
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btrfs_set_super_flags(disk_super, super_flags);
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ret = btrfs_commit_transaction(trans, root);
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return ret;
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}
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