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btrfs: Add check to avoid cleanup roots already in fs_info->dead_roots.
Current btrfs_orphan_cleanup will also cleanup roots which is already in fs_info->dead_roots without protection. This will have conditional race with fs_info->cleaner_kthread. This patch will use refs in root->root_item to detect roots in dead_roots and avoid conflicts. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -3534,28 +3534,51 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
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{
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u64 root_objectid = 0;
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struct btrfs_root *gang[8];
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int i;
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int ret;
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int i = 0;
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int err = 0;
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unsigned int ret = 0;
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int index;
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while (1) {
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index = srcu_read_lock(&fs_info->subvol_srcu);
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ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
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(void **)gang, root_objectid,
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ARRAY_SIZE(gang));
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if (!ret)
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if (!ret) {
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srcu_read_unlock(&fs_info->subvol_srcu, index);
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break;
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}
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root_objectid = gang[ret - 1]->root_key.objectid + 1;
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for (i = 0; i < ret; i++) {
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int err;
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for (i = 0; i < ret; i++) {
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/* Avoid to grab roots in dead_roots */
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if (btrfs_root_refs(&gang[i]->root_item) == 0) {
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gang[i] = NULL;
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continue;
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}
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/* grab all the search result for later use */
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gang[i] = btrfs_grab_fs_root(gang[i]);
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}
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srcu_read_unlock(&fs_info->subvol_srcu, index);
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for (i = 0; i < ret; i++) {
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if (!gang[i])
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continue;
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root_objectid = gang[i]->root_key.objectid;
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err = btrfs_orphan_cleanup(gang[i]);
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if (err)
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return err;
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break;
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btrfs_put_fs_root(gang[i]);
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}
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root_objectid++;
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}
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return 0;
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/* release the uncleaned roots due to error */
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for (; i < ret; i++) {
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if (gang[i])
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btrfs_put_fs_root(gang[i]);
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}
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return err;
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}
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int btrfs_commit_super(struct btrfs_root *root)
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