+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) STRATO AG 2012. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
*/
+
#include <linux/sched.h>
#include <linux/bio.h>
#include <linux/slab.h>
struct btrfs_device *srcdev,
struct btrfs_device *tgtdev);
static int btrfs_dev_replace_kthread(void *data);
-static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
-
int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
{
return ret;
}
+/*
+ * Initialize a new device for device replace target from a given source dev
+ * and path.
+ *
+ * Return 0 and new device in @device_out, otherwise return < 0
+ */
+static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
+ const char *device_path,
+ struct btrfs_device *srcdev,
+ struct btrfs_device **device_out)
+{
+ struct btrfs_device *device;
+ struct block_device *bdev;
+ struct list_head *devices;
+ struct rcu_string *name;
+ u64 devid = BTRFS_DEV_REPLACE_DEVID;
+ int ret = 0;
+
+ *device_out = NULL;
+ if (fs_info->fs_devices->seeding) {
+ btrfs_err(fs_info, "the filesystem is a seed filesystem!");
+ return -EINVAL;
+ }
+
+ bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
+ fs_info->bdev_holder);
+ if (IS_ERR(bdev)) {
+ btrfs_err(fs_info, "target device %s is invalid!", device_path);
+ return PTR_ERR(bdev);
+ }
+
+ filemap_write_and_wait(bdev->bd_inode->i_mapping);
+
+ devices = &fs_info->fs_devices->devices;
+ list_for_each_entry(device, devices, dev_list) {
+ if (device->bdev == bdev) {
+ btrfs_err(fs_info,
+ "target device is in the filesystem!");
+ ret = -EEXIST;
+ goto error;
+ }
+ }
+
+
+ if (i_size_read(bdev->bd_inode) <
+ btrfs_device_get_total_bytes(srcdev)) {
+ btrfs_err(fs_info,
+ "target device is smaller than source device!");
+ ret = -EINVAL;
+ goto error;
+ }
+
+
+ device = btrfs_alloc_device(NULL, &devid, NULL);
+ if (IS_ERR(device)) {
+ ret = PTR_ERR(device);
+ goto error;
+ }
+
+ name = rcu_string_strdup(device_path, GFP_KERNEL);
+ if (!name) {
+ btrfs_free_device(device);
+ ret = -ENOMEM;
+ goto error;
+ }
+ rcu_assign_pointer(device->name, name);
+
+ mutex_lock(&fs_info->fs_devices->device_list_mutex);
+ set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
+ device->generation = 0;
+ device->io_width = fs_info->sectorsize;
+ device->io_align = fs_info->sectorsize;
+ device->sector_size = fs_info->sectorsize;
+ device->total_bytes = btrfs_device_get_total_bytes(srcdev);
+ device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev);
+ device->bytes_used = btrfs_device_get_bytes_used(srcdev);
+ device->commit_total_bytes = srcdev->commit_total_bytes;
+ device->commit_bytes_used = device->bytes_used;
+ device->fs_info = fs_info;
+ device->bdev = bdev;
+ set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
+ set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
+ device->mode = FMODE_EXCL;
+ device->dev_stats_valid = 1;
+ set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
+ device->fs_devices = fs_info->fs_devices;
+ list_add(&device->dev_list, &fs_info->fs_devices->devices);
+ fs_info->fs_devices->num_devices++;
+ fs_info->fs_devices->open_devices++;
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+
+ *device_out = device;
+ return 0;
+
+error:
+ blkdev_put(bdev, FMODE_EXCL);
+ return ret;
+}
+
/*
* called from commit_transaction. Writes changed device replace state to
* disk.
struct btrfs_device *tgt_device = NULL;
struct btrfs_device *src_device = NULL;
- /* the disk copy procedure reuses the scrub code */
- mutex_lock(&fs_info->volume_mutex);
ret = btrfs_find_device_by_devspec(fs_info, srcdevid,
srcdev_name, &src_device);
- if (ret) {
- mutex_unlock(&fs_info->volume_mutex);
+ if (ret)
return ret;
- }
ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name,
src_device, &tgt_device);
- mutex_unlock(&fs_info->volume_mutex);
if (ret)
return ret;
dev_replace->cont_reading_from_srcdev_mode = read_src;
WARN_ON(!src_device);
dev_replace->srcdev = src_device;
- WARN_ON(!tgt_device);
dev_replace->tgtdev = tgt_device;
btrfs_info_in_rcu(fs_info,
}
btrfs_dev_replace_write_unlock(dev_replace);
- WARN_ON(test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
+ /*
+ * This could collide with a paused balance, but the exclusive op logic
+ * should never allow both to start and pause. We don't want to allow
+ * dev-replace to start anyway.
+ */
+ if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
+ btrfs_info(fs_info,
+ "cannot resume dev-replace, other exclusive operation running");
+ return 0;
+ }
+
task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
return PTR_ERR_OR_ZERO(task);
}
struct btrfs_fs_info *fs_info = data;
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
u64 progress;
+ int ret;
progress = btrfs_dev_replace_progress(fs_info);
progress = div_u64(progress, 10);
btrfs_dev_name(dev_replace->tgtdev),
(unsigned int)progress);
- btrfs_dev_replace_continue_on_mount(fs_info);
- clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
-
- return 0;
-}
-
-static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info)
-{
- struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
- int ret;
-
ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid,
dev_replace->committed_cursor_left,
btrfs_device_get_total_bytes(dev_replace->srcdev),
&dev_replace->scrub_progress, 0, 1);
ret = btrfs_dev_replace_finishing(fs_info, ret);
WARN_ON(ret);
+
+ clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
return 0;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff