forked from Mirrors/btrfs-progs
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
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/*
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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 "transaction.h"
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#include "messages.h"
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struct btrfs_trans_handle* btrfs_start_transaction(struct btrfs_root *root,
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int num_blocks)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_trans_handle *h = kzalloc(sizeof(*h), GFP_NOFS);
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if (!h)
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return ERR_PTR(-ENOMEM);
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if (root->commit_root) {
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error("commit_root aleady set when starting transaction");
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kfree(h);
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return ERR_PTR(-EINVAL);
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}
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if (fs_info->running_transaction) {
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error("attempt to start transaction over already running one");
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kfree(h);
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return ERR_PTR(-EINVAL);
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}
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fs_info->running_transaction = h;
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fs_info->generation++;
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h->transid = fs_info->generation;
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h->blocks_reserved = num_blocks;
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root->last_trans = h->transid;
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root->commit_root = root->node;
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extent_buffer_get(root->node);
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return h;
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}
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