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Btrfs: add new sources for device replace code
This adds a new file to the sources together with the header file and the changes to ioctl.h and ctree.h that are required by the new C source file. Additionally, 4 new functions are added to volume.c that deal with device creation and destruction. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Stefan Behrens
Josef Bacik
parent
ff023aac31
commit
e93c89c1aa
7 changed files with 1069 additions and 1 deletions
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@ -8,7 +8,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
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extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
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extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
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export.o tree-log.o free-space-cache.o zlib.o lzo.o \
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export.o tree-log.o free-space-cache.o zlib.o lzo.o \
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compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
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compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
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reada.o backref.o ulist.o qgroup.o send.o
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reada.o backref.o ulist.o qgroup.o send.o dev-replace.o
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btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
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btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
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btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
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btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
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@ -142,6 +142,8 @@ struct btrfs_ordered_sum;
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#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
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#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
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#define BTRFS_DEV_REPLACE_DEVID 0
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/*
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/*
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* the max metadata block size. This limit is somewhat artificial,
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* the max metadata block size. This limit is somewhat artificial,
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* but the memmove costs go through the roof for larger blocks.
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* but the memmove costs go through the roof for larger blocks.
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856
fs/btrfs/dev-replace.c
Normal file
856
fs/btrfs/dev-replace.c
Normal file
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@ -0,0 +1,856 @@
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/*
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* Copyright (C) STRATO AG 2012. All rights reserved.
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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 <linux/sched.h>
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#include <linux/bio.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include <linux/blkdev.h>
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#include <linux/random.h>
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#include <linux/iocontext.h>
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#include <linux/capability.h>
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#include <linux/kthread.h>
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#include <linux/math64.h>
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#include <asm/div64.h>
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#include "compat.h"
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#include "ctree.h"
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#include "extent_map.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "print-tree.h"
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#include "volumes.h"
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#include "async-thread.h"
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#include "check-integrity.h"
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#include "rcu-string.h"
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#include "dev-replace.h"
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static u64 btrfs_get_seconds_since_1970(void);
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static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
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int scrub_ret);
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static void btrfs_dev_replace_update_device_in_mapping_tree(
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struct btrfs_fs_info *fs_info,
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struct btrfs_device *srcdev,
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struct btrfs_device *tgtdev);
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static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
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char *srcdev_name,
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struct btrfs_device **device);
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static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
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static int btrfs_dev_replace_kthread(void *data);
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static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
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int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_key key;
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struct btrfs_root *dev_root = fs_info->dev_root;
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
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struct extent_buffer *eb;
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int slot;
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int ret = 0;
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struct btrfs_path *path = NULL;
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int item_size;
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struct btrfs_dev_replace_item *ptr;
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u64 src_devid;
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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key.objectid = 0;
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key.type = BTRFS_DEV_REPLACE_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
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if (ret) {
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no_valid_dev_replace_entry_found:
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ret = 0;
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dev_replace->replace_state =
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BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED;
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dev_replace->cont_reading_from_srcdev_mode =
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BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
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dev_replace->replace_state = 0;
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dev_replace->time_started = 0;
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dev_replace->time_stopped = 0;
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atomic64_set(&dev_replace->num_write_errors, 0);
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atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
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dev_replace->cursor_left = 0;
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dev_replace->committed_cursor_left = 0;
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dev_replace->cursor_left_last_write_of_item = 0;
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dev_replace->cursor_right = 0;
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dev_replace->srcdev = NULL;
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dev_replace->tgtdev = NULL;
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dev_replace->is_valid = 0;
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dev_replace->item_needs_writeback = 0;
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goto out;
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}
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slot = path->slots[0];
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eb = path->nodes[0];
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item_size = btrfs_item_size_nr(eb, slot);
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ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item);
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if (item_size != sizeof(struct btrfs_dev_replace_item)) {
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pr_warn("btrfs: dev_replace entry found has unexpected size, ignore entry\n");
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goto no_valid_dev_replace_entry_found;
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}
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src_devid = btrfs_dev_replace_src_devid(eb, ptr);
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dev_replace->cont_reading_from_srcdev_mode =
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btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr);
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dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr);
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dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr);
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dev_replace->time_stopped =
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btrfs_dev_replace_time_stopped(eb, ptr);
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atomic64_set(&dev_replace->num_write_errors,
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btrfs_dev_replace_num_write_errors(eb, ptr));
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atomic64_set(&dev_replace->num_uncorrectable_read_errors,
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btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
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dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr);
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dev_replace->committed_cursor_left = dev_replace->cursor_left;
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dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left;
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dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr);
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dev_replace->is_valid = 1;
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dev_replace->item_needs_writeback = 0;
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switch (dev_replace->replace_state) {
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case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
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case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
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case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
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dev_replace->srcdev = NULL;
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dev_replace->tgtdev = NULL;
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break;
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case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
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case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
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dev_replace->srcdev = btrfs_find_device(fs_info, src_devid,
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NULL, NULL);
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dev_replace->tgtdev = btrfs_find_device(fs_info,
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BTRFS_DEV_REPLACE_DEVID,
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NULL, NULL);
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/*
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* allow 'btrfs dev replace_cancel' if src/tgt device is
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* missing
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*/
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if (!dev_replace->srcdev &&
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!btrfs_test_opt(dev_root, DEGRADED)) {
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ret = -EIO;
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pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?\n",
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(unsigned long long)src_devid);
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}
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if (!dev_replace->tgtdev &&
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!btrfs_test_opt(dev_root, DEGRADED)) {
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ret = -EIO;
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pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "tgtdev (devid %llu) is missing, need to run btrfs dev scan?\n",
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(unsigned long long)BTRFS_DEV_REPLACE_DEVID);
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}
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if (dev_replace->tgtdev) {
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if (dev_replace->srcdev) {
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dev_replace->tgtdev->total_bytes =
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dev_replace->srcdev->total_bytes;
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dev_replace->tgtdev->disk_total_bytes =
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dev_replace->srcdev->disk_total_bytes;
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dev_replace->tgtdev->bytes_used =
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dev_replace->srcdev->bytes_used;
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}
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dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1;
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btrfs_init_dev_replace_tgtdev_for_resume(fs_info,
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dev_replace->tgtdev);
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}
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break;
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}
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out:
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if (path)
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btrfs_free_path(path);
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return ret;
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}
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/*
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* called from commit_transaction. Writes changed device replace state to
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* disk.
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*/
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int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info)
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{
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int ret;
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struct btrfs_root *dev_root = fs_info->dev_root;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct extent_buffer *eb;
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struct btrfs_dev_replace_item *ptr;
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
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btrfs_dev_replace_lock(dev_replace);
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if (!dev_replace->is_valid ||
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!dev_replace->item_needs_writeback) {
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btrfs_dev_replace_unlock(dev_replace);
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return 0;
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}
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btrfs_dev_replace_unlock(dev_replace);
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key.objectid = 0;
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key.type = BTRFS_DEV_REPLACE_KEY;
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key.offset = 0;
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
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if (ret < 0) {
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pr_warn("btrfs: error %d while searching for dev_replace item!\n",
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ret);
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goto out;
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}
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if (ret == 0 &&
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btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
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/*
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* need to delete old one and insert a new one.
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* Since no attempt is made to recover any old state, if the
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* dev_replace state is 'running', the data on the target
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* drive is lost.
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* It would be possible to recover the state: just make sure
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* that the beginning of the item is never changed and always
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* contains all the essential information. Then read this
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* minimal set of information and use it as a base for the
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* new state.
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*/
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ret = btrfs_del_item(trans, dev_root, path);
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if (ret != 0) {
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pr_warn("btrfs: delete too small dev_replace item failed %d!\n",
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ret);
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goto out;
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}
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ret = 1;
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}
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if (ret == 1) {
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/* need to insert a new item */
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btrfs_release_path(path);
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ret = btrfs_insert_empty_item(trans, dev_root, path,
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&key, sizeof(*ptr));
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if (ret < 0) {
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pr_warn("btrfs: insert dev_replace item failed %d!\n",
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ret);
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goto out;
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}
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}
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eb = path->nodes[0];
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ptr = btrfs_item_ptr(eb, path->slots[0],
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struct btrfs_dev_replace_item);
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btrfs_dev_replace_lock(dev_replace);
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if (dev_replace->srcdev)
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btrfs_set_dev_replace_src_devid(eb, ptr,
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dev_replace->srcdev->devid);
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else
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btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1);
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btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr,
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dev_replace->cont_reading_from_srcdev_mode);
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btrfs_set_dev_replace_replace_state(eb, ptr,
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dev_replace->replace_state);
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btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started);
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btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped);
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btrfs_set_dev_replace_num_write_errors(eb, ptr,
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atomic64_read(&dev_replace->num_write_errors));
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btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
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atomic64_read(&dev_replace->num_uncorrectable_read_errors));
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dev_replace->cursor_left_last_write_of_item =
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dev_replace->cursor_left;
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btrfs_set_dev_replace_cursor_left(eb, ptr,
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dev_replace->cursor_left_last_write_of_item);
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btrfs_set_dev_replace_cursor_right(eb, ptr,
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dev_replace->cursor_right);
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dev_replace->item_needs_writeback = 0;
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btrfs_dev_replace_unlock(dev_replace);
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btrfs_mark_buffer_dirty(eb);
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out:
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btrfs_free_path(path);
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return ret;
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}
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void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
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dev_replace->committed_cursor_left =
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dev_replace->cursor_left_last_write_of_item;
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}
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static u64 btrfs_get_seconds_since_1970(void)
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{
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struct timespec t = CURRENT_TIME_SEC;
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return t.tv_sec;
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}
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int btrfs_dev_replace_start(struct btrfs_root *root,
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|
struct btrfs_ioctl_dev_replace_args *args)
|
||||||
|
{
|
||||||
|
struct btrfs_trans_handle *trans;
|
||||||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
int ret;
|
||||||
|
struct btrfs_device *tgt_device = NULL;
|
||||||
|
struct btrfs_device *src_device = NULL;
|
||||||
|
|
||||||
|
switch (args->start.cont_reading_from_srcdev_mode) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
|
||||||
|
args->start.tgtdev_name[0] == '\0')
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
mutex_lock(&fs_info->volume_mutex);
|
||||||
|
ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
|
||||||
|
&tgt_device);
|
||||||
|
if (ret) {
|
||||||
|
pr_err("btrfs: target device %s is invalid!\n",
|
||||||
|
args->start.tgtdev_name);
|
||||||
|
mutex_unlock(&fs_info->volume_mutex);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
|
||||||
|
args->start.srcdev_name,
|
||||||
|
&src_device);
|
||||||
|
mutex_unlock(&fs_info->volume_mutex);
|
||||||
|
if (ret) {
|
||||||
|
ret = -EINVAL;
|
||||||
|
goto leave_no_lock;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (tgt_device->total_bytes < src_device->total_bytes) {
|
||||||
|
pr_err("btrfs: target device is smaller than source device!\n");
|
||||||
|
ret = -EINVAL;
|
||||||
|
goto leave_no_lock;
|
||||||
|
}
|
||||||
|
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
switch (dev_replace->replace_state) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
||||||
|
break;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
||||||
|
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
|
||||||
|
goto leave;
|
||||||
|
}
|
||||||
|
|
||||||
|
dev_replace->cont_reading_from_srcdev_mode =
|
||||||
|
args->start.cont_reading_from_srcdev_mode;
|
||||||
|
WARN_ON(!src_device);
|
||||||
|
dev_replace->srcdev = src_device;
|
||||||
|
WARN_ON(!tgt_device);
|
||||||
|
dev_replace->tgtdev = tgt_device;
|
||||||
|
|
||||||
|
printk_in_rcu(KERN_INFO
|
||||||
|
"btrfs: dev_replace from %s (devid %llu) to %s) started\n",
|
||||||
|
src_device->missing ? "<missing disk>" :
|
||||||
|
rcu_str_deref(src_device->name),
|
||||||
|
src_device->devid,
|
||||||
|
rcu_str_deref(tgt_device->name));
|
||||||
|
|
||||||
|
tgt_device->total_bytes = src_device->total_bytes;
|
||||||
|
tgt_device->disk_total_bytes = src_device->disk_total_bytes;
|
||||||
|
tgt_device->bytes_used = src_device->bytes_used;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* from now on, the writes to the srcdev are all duplicated to
|
||||||
|
* go to the tgtdev as well (refer to btrfs_map_block()).
|
||||||
|
*/
|
||||||
|
dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
|
||||||
|
dev_replace->time_started = btrfs_get_seconds_since_1970();
|
||||||
|
dev_replace->cursor_left = 0;
|
||||||
|
dev_replace->committed_cursor_left = 0;
|
||||||
|
dev_replace->cursor_left_last_write_of_item = 0;
|
||||||
|
dev_replace->cursor_right = 0;
|
||||||
|
dev_replace->is_valid = 1;
|
||||||
|
dev_replace->item_needs_writeback = 1;
|
||||||
|
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
|
||||||
|
btrfs_wait_ordered_extents(root, 0);
|
||||||
|
|
||||||
|
/* force writing the updated state information to disk */
|
||||||
|
trans = btrfs_start_transaction(root, 0);
|
||||||
|
if (IS_ERR(trans)) {
|
||||||
|
ret = PTR_ERR(trans);
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
goto leave;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = btrfs_commit_transaction(trans, root);
|
||||||
|
WARN_ON(ret);
|
||||||
|
|
||||||
|
/* the disk copy procedure reuses the scrub code */
|
||||||
|
ret = btrfs_scrub_dev(fs_info, src_device->devid, 0,
|
||||||
|
src_device->total_bytes,
|
||||||
|
&dev_replace->scrub_progress, 0, 1);
|
||||||
|
|
||||||
|
ret = btrfs_dev_replace_finishing(root->fs_info, ret);
|
||||||
|
WARN_ON(ret);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
leave:
|
||||||
|
dev_replace->srcdev = NULL;
|
||||||
|
dev_replace->tgtdev = NULL;
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
leave_no_lock:
|
||||||
|
if (tgt_device)
|
||||||
|
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
|
||||||
|
int scrub_ret)
|
||||||
|
{
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
struct btrfs_device *tgt_device;
|
||||||
|
struct btrfs_device *src_device;
|
||||||
|
struct btrfs_root *root = fs_info->tree_root;
|
||||||
|
u8 uuid_tmp[BTRFS_UUID_SIZE];
|
||||||
|
struct btrfs_trans_handle *trans;
|
||||||
|
int ret = 0;
|
||||||
|
|
||||||
|
/* don't allow cancel or unmount to disturb the finishing procedure */
|
||||||
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
/* was the operation canceled, or is it finished? */
|
||||||
|
if (dev_replace->replace_state !=
|
||||||
|
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
tgt_device = dev_replace->tgtdev;
|
||||||
|
src_device = dev_replace->srcdev;
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
|
||||||
|
/* replace old device with new one in mapping tree */
|
||||||
|
if (!scrub_ret)
|
||||||
|
btrfs_dev_replace_update_device_in_mapping_tree(fs_info,
|
||||||
|
src_device,
|
||||||
|
tgt_device);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* flush all outstanding I/O and inode extent mappings before the
|
||||||
|
* copy operation is declared as being finished
|
||||||
|
*/
|
||||||
|
btrfs_start_delalloc_inodes(root, 0);
|
||||||
|
btrfs_wait_ordered_extents(root, 0);
|
||||||
|
|
||||||
|
trans = btrfs_start_transaction(root, 0);
|
||||||
|
if (IS_ERR(trans)) {
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
return PTR_ERR(trans);
|
||||||
|
}
|
||||||
|
ret = btrfs_commit_transaction(trans, root);
|
||||||
|
WARN_ON(ret);
|
||||||
|
|
||||||
|
/* keep away write_all_supers() during the finishing procedure */
|
||||||
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
dev_replace->replace_state =
|
||||||
|
scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
|
||||||
|
: BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
|
||||||
|
dev_replace->tgtdev = NULL;
|
||||||
|
dev_replace->srcdev = NULL;
|
||||||
|
dev_replace->time_stopped = btrfs_get_seconds_since_1970();
|
||||||
|
dev_replace->item_needs_writeback = 1;
|
||||||
|
|
||||||
|
if (scrub_ret) {
|
||||||
|
printk_in_rcu(KERN_ERR
|
||||||
|
"btrfs: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
|
||||||
|
src_device->missing ? "<missing disk>" :
|
||||||
|
rcu_str_deref(src_device->name),
|
||||||
|
src_device->devid,
|
||||||
|
rcu_str_deref(tgt_device->name), scrub_ret);
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||||||
|
if (tgt_device)
|
||||||
|
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
printk_in_rcu(KERN_INFO
|
||||||
|
"btrfs: dev_replace from %s (devid %llu) to %s) finished\n",
|
||||||
|
src_device->missing ? "<missing disk>" :
|
||||||
|
rcu_str_deref(src_device->name),
|
||||||
|
src_device->devid,
|
||||||
|
rcu_str_deref(tgt_device->name));
|
||||||
|
tgt_device->is_tgtdev_for_dev_replace = 0;
|
||||||
|
tgt_device->devid = src_device->devid;
|
||||||
|
src_device->devid = BTRFS_DEV_REPLACE_DEVID;
|
||||||
|
tgt_device->bytes_used = src_device->bytes_used;
|
||||||
|
memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp));
|
||||||
|
memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid));
|
||||||
|
memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid));
|
||||||
|
tgt_device->total_bytes = src_device->total_bytes;
|
||||||
|
tgt_device->disk_total_bytes = src_device->disk_total_bytes;
|
||||||
|
tgt_device->bytes_used = src_device->bytes_used;
|
||||||
|
if (fs_info->sb->s_bdev == src_device->bdev)
|
||||||
|
fs_info->sb->s_bdev = tgt_device->bdev;
|
||||||
|
if (fs_info->fs_devices->latest_bdev == src_device->bdev)
|
||||||
|
fs_info->fs_devices->latest_bdev = tgt_device->bdev;
|
||||||
|
list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
|
||||||
|
|
||||||
|
btrfs_rm_dev_replace_srcdev(fs_info, src_device);
|
||||||
|
if (src_device->bdev) {
|
||||||
|
/* zero out the old super */
|
||||||
|
btrfs_scratch_superblock(src_device);
|
||||||
|
}
|
||||||
|
/*
|
||||||
|
* this is again a consistent state where no dev_replace procedure
|
||||||
|
* is running, the target device is part of the filesystem, the
|
||||||
|
* source device is not part of the filesystem anymore and its 1st
|
||||||
|
* superblock is scratched out so that it is no longer marked to
|
||||||
|
* belong to this filesystem.
|
||||||
|
*/
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||||||
|
|
||||||
|
/* write back the superblocks */
|
||||||
|
trans = btrfs_start_transaction(root, 0);
|
||||||
|
if (!IS_ERR(trans))
|
||||||
|
btrfs_commit_transaction(trans, root);
|
||||||
|
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void btrfs_dev_replace_update_device_in_mapping_tree(
|
||||||
|
struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *srcdev,
|
||||||
|
struct btrfs_device *tgtdev)
|
||||||
|
{
|
||||||
|
struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
|
||||||
|
struct extent_map *em;
|
||||||
|
struct map_lookup *map;
|
||||||
|
u64 start = 0;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
write_lock(&em_tree->lock);
|
||||||
|
do {
|
||||||
|
em = lookup_extent_mapping(em_tree, start, (u64)-1);
|
||||||
|
if (!em)
|
||||||
|
break;
|
||||||
|
map = (struct map_lookup *)em->bdev;
|
||||||
|
for (i = 0; i < map->num_stripes; i++)
|
||||||
|
if (srcdev == map->stripes[i].dev)
|
||||||
|
map->stripes[i].dev = tgtdev;
|
||||||
|
start = em->start + em->len;
|
||||||
|
free_extent_map(em);
|
||||||
|
} while (start);
|
||||||
|
write_unlock(&em_tree->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
|
||||||
|
char *srcdev_name,
|
||||||
|
struct btrfs_device **device)
|
||||||
|
{
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
if (srcdevid) {
|
||||||
|
ret = 0;
|
||||||
|
*device = btrfs_find_device(root->fs_info, srcdevid, NULL,
|
||||||
|
NULL);
|
||||||
|
if (!*device)
|
||||||
|
ret = -ENOENT;
|
||||||
|
} else {
|
||||||
|
ret = btrfs_find_device_missing_or_by_path(root, srcdev_name,
|
||||||
|
device);
|
||||||
|
}
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_ioctl_dev_replace_args *args)
|
||||||
|
{
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
/* even if !dev_replace_is_valid, the values are good enough for
|
||||||
|
* the replace_status ioctl */
|
||||||
|
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
||||||
|
args->status.replace_state = dev_replace->replace_state;
|
||||||
|
args->status.time_started = dev_replace->time_started;
|
||||||
|
args->status.time_stopped = dev_replace->time_stopped;
|
||||||
|
args->status.num_write_errors =
|
||||||
|
atomic64_read(&dev_replace->num_write_errors);
|
||||||
|
args->status.num_uncorrectable_read_errors =
|
||||||
|
atomic64_read(&dev_replace->num_uncorrectable_read_errors);
|
||||||
|
switch (dev_replace->replace_state) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
||||||
|
args->status.progress_1000 = 0;
|
||||||
|
break;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
||||||
|
args->status.progress_1000 = 1000;
|
||||||
|
break;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
||||||
|
args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
|
||||||
|
div64_u64(dev_replace->srcdev->total_bytes, 1000));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
}
|
||||||
|
|
||||||
|
int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_ioctl_dev_replace_args *args)
|
||||||
|
{
|
||||||
|
args->result = __btrfs_dev_replace_cancel(fs_info);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
|
||||||
|
{
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
struct btrfs_device *tgt_device = NULL;
|
||||||
|
struct btrfs_trans_handle *trans;
|
||||||
|
struct btrfs_root *root = fs_info->tree_root;
|
||||||
|
u64 result;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
switch (dev_replace->replace_state) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
||||||
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
goto leave;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
||||||
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
||||||
|
tgt_device = dev_replace->tgtdev;
|
||||||
|
dev_replace->tgtdev = NULL;
|
||||||
|
dev_replace->srcdev = NULL;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
|
||||||
|
dev_replace->time_stopped = btrfs_get_seconds_since_1970();
|
||||||
|
dev_replace->item_needs_writeback = 1;
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
btrfs_scrub_cancel(fs_info);
|
||||||
|
|
||||||
|
trans = btrfs_start_transaction(root, 0);
|
||||||
|
if (IS_ERR(trans)) {
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
return PTR_ERR(trans);
|
||||||
|
}
|
||||||
|
ret = btrfs_commit_transaction(trans, root);
|
||||||
|
WARN_ON(ret);
|
||||||
|
if (tgt_device)
|
||||||
|
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
|
||||||
|
|
||||||
|
leave:
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
|
||||||
|
{
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
|
||||||
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
switch (dev_replace->replace_state) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
||||||
|
break;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
||||||
|
dev_replace->replace_state =
|
||||||
|
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
|
||||||
|
dev_replace->time_stopped = btrfs_get_seconds_since_1970();
|
||||||
|
dev_replace->item_needs_writeback = 1;
|
||||||
|
pr_info("btrfs: suspending dev_replace for unmount\n");
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* resume dev_replace procedure that was interrupted by unmount */
|
||||||
|
int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
|
||||||
|
{
|
||||||
|
struct task_struct *task;
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
|
||||||
|
btrfs_dev_replace_lock(dev_replace);
|
||||||
|
switch (dev_replace->replace_state) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
return 0;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
||||||
|
break;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
||||||
|
dev_replace->replace_state =
|
||||||
|
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) {
|
||||||
|
pr_info("btrfs: cannot continue dev_replace, tgtdev is missing\n"
|
||||||
|
"btrfs: you may cancel the operation after 'mount -o degraded'\n");
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
btrfs_dev_replace_unlock(dev_replace);
|
||||||
|
|
||||||
|
WARN_ON(atomic_xchg(
|
||||||
|
&fs_info->mutually_exclusive_operation_running, 1));
|
||||||
|
task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
|
||||||
|
return PTR_RET(task);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int btrfs_dev_replace_kthread(void *data)
|
||||||
|
{
|
||||||
|
struct btrfs_fs_info *fs_info = data;
|
||||||
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
||||||
|
struct btrfs_ioctl_dev_replace_args *status_args;
|
||||||
|
u64 progress;
|
||||||
|
|
||||||
|
status_args = kzalloc(sizeof(*status_args), GFP_NOFS);
|
||||||
|
if (status_args) {
|
||||||
|
btrfs_dev_replace_status(fs_info, status_args);
|
||||||
|
progress = status_args->status.progress_1000;
|
||||||
|
kfree(status_args);
|
||||||
|
do_div(progress, 10);
|
||||||
|
printk_in_rcu(KERN_INFO
|
||||||
|
"btrfs: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
|
||||||
|
dev_replace->srcdev->missing ? "<missing disk>" :
|
||||||
|
rcu_str_deref(dev_replace->srcdev->name),
|
||||||
|
dev_replace->srcdev->devid,
|
||||||
|
dev_replace->tgtdev ?
|
||||||
|
rcu_str_deref(dev_replace->tgtdev->name) :
|
||||||
|
"<missing target disk>",
|
||||||
|
(unsigned int)progress);
|
||||||
|
}
|
||||||
|
btrfs_dev_replace_continue_on_mount(fs_info);
|
||||||
|
atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
|
||||||
|
|
||||||
|
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,
|
||||||
|
dev_replace->srcdev->total_bytes,
|
||||||
|
&dev_replace->scrub_progress, 0, 1);
|
||||||
|
ret = btrfs_dev_replace_finishing(fs_info, ret);
|
||||||
|
WARN_ON(ret);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
|
||||||
|
{
|
||||||
|
if (!dev_replace->is_valid)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
switch (dev_replace->replace_state) {
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
||||||
|
return 0;
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
||||||
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
||||||
|
/*
|
||||||
|
* return true even if tgtdev is missing (this is
|
||||||
|
* something that can happen if the dev_replace
|
||||||
|
* procedure is suspended by an umount and then
|
||||||
|
* the tgtdev is missing (or "btrfs dev scan") was
|
||||||
|
* not called and the the filesystem is remounted
|
||||||
|
* in degraded state. This does not stop the
|
||||||
|
* dev_replace procedure. It needs to be canceled
|
||||||
|
* manually if the cancelation is wanted.
|
||||||
|
*/
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace)
|
||||||
|
{
|
||||||
|
/* the beginning is just an optimization for the typical case */
|
||||||
|
if (atomic_read(&dev_replace->nesting_level) == 0) {
|
||||||
|
acquire_lock:
|
||||||
|
/* this is not a nested case where the same thread
|
||||||
|
* is trying to acqurire the same lock twice */
|
||||||
|
mutex_lock(&dev_replace->lock);
|
||||||
|
mutex_lock(&dev_replace->lock_management_lock);
|
||||||
|
dev_replace->lock_owner = current->pid;
|
||||||
|
atomic_inc(&dev_replace->nesting_level);
|
||||||
|
mutex_unlock(&dev_replace->lock_management_lock);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
mutex_lock(&dev_replace->lock_management_lock);
|
||||||
|
if (atomic_read(&dev_replace->nesting_level) > 0 &&
|
||||||
|
dev_replace->lock_owner == current->pid) {
|
||||||
|
WARN_ON(!mutex_is_locked(&dev_replace->lock));
|
||||||
|
atomic_inc(&dev_replace->nesting_level);
|
||||||
|
mutex_unlock(&dev_replace->lock_management_lock);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
mutex_unlock(&dev_replace->lock_management_lock);
|
||||||
|
goto acquire_lock;
|
||||||
|
}
|
||||||
|
|
||||||
|
void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace)
|
||||||
|
{
|
||||||
|
WARN_ON(!mutex_is_locked(&dev_replace->lock));
|
||||||
|
mutex_lock(&dev_replace->lock_management_lock);
|
||||||
|
WARN_ON(atomic_read(&dev_replace->nesting_level) < 1);
|
||||||
|
WARN_ON(dev_replace->lock_owner != current->pid);
|
||||||
|
atomic_dec(&dev_replace->nesting_level);
|
||||||
|
if (atomic_read(&dev_replace->nesting_level) == 0) {
|
||||||
|
dev_replace->lock_owner = 0;
|
||||||
|
mutex_unlock(&dev_replace->lock_management_lock);
|
||||||
|
mutex_unlock(&dev_replace->lock);
|
||||||
|
} else {
|
||||||
|
mutex_unlock(&dev_replace->lock_management_lock);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -19,6 +19,24 @@
|
||||||
#if !defined(__BTRFS_DEV_REPLACE__)
|
#if !defined(__BTRFS_DEV_REPLACE__)
|
||||||
#define __BTRFS_DEV_REPLACE__
|
#define __BTRFS_DEV_REPLACE__
|
||||||
|
|
||||||
|
struct btrfs_ioctl_dev_replace_args;
|
||||||
|
|
||||||
|
int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info);
|
||||||
|
int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
|
||||||
|
struct btrfs_fs_info *fs_info);
|
||||||
|
void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info);
|
||||||
|
int btrfs_dev_replace_start(struct btrfs_root *root,
|
||||||
|
struct btrfs_ioctl_dev_replace_args *args);
|
||||||
|
void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_ioctl_dev_replace_args *args);
|
||||||
|
int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_ioctl_dev_replace_args *args);
|
||||||
|
void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info);
|
||||||
|
int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info);
|
||||||
|
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace);
|
||||||
|
void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace);
|
||||||
|
void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace);
|
||||||
|
|
||||||
static inline void btrfs_dev_replace_stats_inc(atomic64_t *stat_value)
|
static inline void btrfs_dev_replace_stats_inc(atomic64_t *stat_value)
|
||||||
{
|
{
|
||||||
atomic64_inc(stat_value);
|
atomic64_inc(stat_value);
|
||||||
|
|
|
||||||
|
|
@ -123,6 +123,48 @@ struct btrfs_ioctl_scrub_args {
|
||||||
__u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
|
__u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
|
||||||
};
|
};
|
||||||
|
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
|
||||||
|
struct btrfs_ioctl_dev_replace_start_params {
|
||||||
|
__u64 srcdevid; /* in, if 0, use srcdev_name instead */
|
||||||
|
__u8 srcdev_name[BTRFS_PATH_NAME_MAX + 1]; /* in */
|
||||||
|
__u8 tgtdev_name[BTRFS_PATH_NAME_MAX + 1]; /* in */
|
||||||
|
__u64 cont_reading_from_srcdev_mode; /* in, see #define
|
||||||
|
* above */
|
||||||
|
};
|
||||||
|
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED 0
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED 1
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED 2
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED 3
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED 4
|
||||||
|
struct btrfs_ioctl_dev_replace_status_params {
|
||||||
|
__u64 replace_state; /* out, see #define above */
|
||||||
|
__u64 progress_1000; /* out, 0 <= x <= 1000 */
|
||||||
|
__u64 time_started; /* out, seconds since 1-Jan-1970 */
|
||||||
|
__u64 time_stopped; /* out, seconds since 1-Jan-1970 */
|
||||||
|
__u64 num_write_errors; /* out */
|
||||||
|
__u64 num_uncorrectable_read_errors; /* out */
|
||||||
|
};
|
||||||
|
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_CMD_START 0
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS 1
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL 2
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR 0
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED 1
|
||||||
|
#define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED 2
|
||||||
|
struct btrfs_ioctl_dev_replace_args {
|
||||||
|
__u64 cmd; /* in */
|
||||||
|
__u64 result; /* out */
|
||||||
|
|
||||||
|
union {
|
||||||
|
struct btrfs_ioctl_dev_replace_start_params start;
|
||||||
|
struct btrfs_ioctl_dev_replace_status_params status;
|
||||||
|
}; /* in/out */
|
||||||
|
|
||||||
|
__u64 spare[64];
|
||||||
|
};
|
||||||
|
|
||||||
#define BTRFS_DEVICE_PATH_NAME_MAX 1024
|
#define BTRFS_DEVICE_PATH_NAME_MAX 1024
|
||||||
struct btrfs_ioctl_dev_info_args {
|
struct btrfs_ioctl_dev_info_args {
|
||||||
__u64 devid; /* in/out */
|
__u64 devid; /* in/out */
|
||||||
|
|
@ -453,4 +495,7 @@ struct btrfs_ioctl_send_args {
|
||||||
struct btrfs_ioctl_qgroup_limit_args)
|
struct btrfs_ioctl_qgroup_limit_args)
|
||||||
#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
|
#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
|
||||||
struct btrfs_ioctl_get_dev_stats)
|
struct btrfs_ioctl_get_dev_stats)
|
||||||
|
#define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
|
||||||
|
struct btrfs_ioctl_dev_replace_args)
|
||||||
|
|
||||||
#endif
|
#endif
|
||||||
|
|
|
||||||
|
|
@ -1537,6 +1537,53 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
|
||||||
goto error_brelse;
|
goto error_brelse;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *srcdev)
|
||||||
|
{
|
||||||
|
WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex));
|
||||||
|
list_del_rcu(&srcdev->dev_list);
|
||||||
|
list_del_rcu(&srcdev->dev_alloc_list);
|
||||||
|
fs_info->fs_devices->num_devices--;
|
||||||
|
if (srcdev->missing) {
|
||||||
|
fs_info->fs_devices->missing_devices--;
|
||||||
|
fs_info->fs_devices->rw_devices++;
|
||||||
|
}
|
||||||
|
if (srcdev->can_discard)
|
||||||
|
fs_info->fs_devices->num_can_discard--;
|
||||||
|
if (srcdev->bdev)
|
||||||
|
fs_info->fs_devices->open_devices--;
|
||||||
|
|
||||||
|
call_rcu(&srcdev->rcu, free_device);
|
||||||
|
}
|
||||||
|
|
||||||
|
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *tgtdev)
|
||||||
|
{
|
||||||
|
struct btrfs_device *next_device;
|
||||||
|
|
||||||
|
WARN_ON(!tgtdev);
|
||||||
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
||||||
|
if (tgtdev->bdev) {
|
||||||
|
btrfs_scratch_superblock(tgtdev);
|
||||||
|
fs_info->fs_devices->open_devices--;
|
||||||
|
}
|
||||||
|
fs_info->fs_devices->num_devices--;
|
||||||
|
if (tgtdev->can_discard)
|
||||||
|
fs_info->fs_devices->num_can_discard++;
|
||||||
|
|
||||||
|
next_device = list_entry(fs_info->fs_devices->devices.next,
|
||||||
|
struct btrfs_device, dev_list);
|
||||||
|
if (tgtdev->bdev == fs_info->sb->s_bdev)
|
||||||
|
fs_info->sb->s_bdev = next_device->bdev;
|
||||||
|
if (tgtdev->bdev == fs_info->fs_devices->latest_bdev)
|
||||||
|
fs_info->fs_devices->latest_bdev = next_device->bdev;
|
||||||
|
list_del_rcu(&tgtdev->dev_list);
|
||||||
|
|
||||||
|
call_rcu(&tgtdev->rcu, free_device);
|
||||||
|
|
||||||
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
||||||
|
}
|
||||||
|
|
||||||
int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
|
int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
|
||||||
struct btrfs_device **device)
|
struct btrfs_device **device)
|
||||||
{
|
{
|
||||||
|
|
@ -1931,6 +1978,98 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
|
||||||
return ret;
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
|
||||||
|
struct btrfs_device **device_out)
|
||||||
|
{
|
||||||
|
struct request_queue *q;
|
||||||
|
struct btrfs_device *device;
|
||||||
|
struct block_device *bdev;
|
||||||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||||||
|
struct list_head *devices;
|
||||||
|
struct rcu_string *name;
|
||||||
|
int ret = 0;
|
||||||
|
|
||||||
|
*device_out = NULL;
|
||||||
|
if (fs_info->fs_devices->seeding)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
|
||||||
|
fs_info->bdev_holder);
|
||||||
|
if (IS_ERR(bdev))
|
||||||
|
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) {
|
||||||
|
ret = -EEXIST;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
device = kzalloc(sizeof(*device), GFP_NOFS);
|
||||||
|
if (!device) {
|
||||||
|
ret = -ENOMEM;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
|
||||||
|
name = rcu_string_strdup(device_path, GFP_NOFS);
|
||||||
|
if (!name) {
|
||||||
|
kfree(device);
|
||||||
|
ret = -ENOMEM;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
rcu_assign_pointer(device->name, name);
|
||||||
|
|
||||||
|
q = bdev_get_queue(bdev);
|
||||||
|
if (blk_queue_discard(q))
|
||||||
|
device->can_discard = 1;
|
||||||
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
||||||
|
device->writeable = 1;
|
||||||
|
device->work.func = pending_bios_fn;
|
||||||
|
generate_random_uuid(device->uuid);
|
||||||
|
device->devid = BTRFS_DEV_REPLACE_DEVID;
|
||||||
|
spin_lock_init(&device->io_lock);
|
||||||
|
device->generation = 0;
|
||||||
|
device->io_width = root->sectorsize;
|
||||||
|
device->io_align = root->sectorsize;
|
||||||
|
device->sector_size = root->sectorsize;
|
||||||
|
device->total_bytes = i_size_read(bdev->bd_inode);
|
||||||
|
device->disk_total_bytes = device->total_bytes;
|
||||||
|
device->dev_root = fs_info->dev_root;
|
||||||
|
device->bdev = bdev;
|
||||||
|
device->in_fs_metadata = 1;
|
||||||
|
device->is_tgtdev_for_dev_replace = 1;
|
||||||
|
device->mode = FMODE_EXCL;
|
||||||
|
set_blocksize(device->bdev, 4096);
|
||||||
|
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++;
|
||||||
|
if (device->can_discard)
|
||||||
|
fs_info->fs_devices->num_can_discard++;
|
||||||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||||||
|
|
||||||
|
*device_out = device;
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
error:
|
||||||
|
blkdev_put(bdev, FMODE_EXCL);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *tgtdev)
|
||||||
|
{
|
||||||
|
WARN_ON(fs_info->fs_devices->rw_devices == 0);
|
||||||
|
tgtdev->io_width = fs_info->dev_root->sectorsize;
|
||||||
|
tgtdev->io_align = fs_info->dev_root->sectorsize;
|
||||||
|
tgtdev->sector_size = fs_info->dev_root->sectorsize;
|
||||||
|
tgtdev->dev_root = fs_info->dev_root;
|
||||||
|
tgtdev->in_fs_metadata = 1;
|
||||||
|
}
|
||||||
|
|
||||||
static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
|
static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
|
||||||
struct btrfs_device *device)
|
struct btrfs_device *device)
|
||||||
{
|
{
|
||||||
|
|
|
||||||
|
|
@ -286,6 +286,8 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
|
||||||
u8 *uuid, u8 *fsid);
|
u8 *uuid, u8 *fsid);
|
||||||
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
|
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
|
||||||
int btrfs_init_new_device(struct btrfs_root *root, char *path);
|
int btrfs_init_new_device(struct btrfs_root *root, char *path);
|
||||||
|
int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
|
||||||
|
struct btrfs_device **device_out);
|
||||||
int btrfs_balance(struct btrfs_balance_control *bctl,
|
int btrfs_balance(struct btrfs_balance_control *bctl,
|
||||||
struct btrfs_ioctl_balance_args *bargs);
|
struct btrfs_ioctl_balance_args *bargs);
|
||||||
int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
|
int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
|
||||||
|
|
@ -302,6 +304,12 @@ int btrfs_get_dev_stats(struct btrfs_root *root,
|
||||||
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
|
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
|
||||||
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
|
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
|
||||||
struct btrfs_fs_info *fs_info);
|
struct btrfs_fs_info *fs_info);
|
||||||
|
void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *srcdev);
|
||||||
|
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *tgtdev);
|
||||||
|
void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
|
||||||
|
struct btrfs_device *tgtdev);
|
||||||
int btrfs_scratch_superblock(struct btrfs_device *device);
|
int btrfs_scratch_superblock(struct btrfs_device *device);
|
||||||
|
|
||||||
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
|
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue