diff options
| author | Miao Xie <miaox@cn.fujitsu.com> | 2014-09-03 21:35:38 +0800 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-09-17 13:38:38 -0700 |
| commit | 7cc8e58d53cd2295c3c1cee7b503bd1790ea4486 (patch) | |
| tree | 1befd9a2bea8e1808f0fe1b12406c05b3f7dbe2d /fs/btrfs/dev-replace.c | |
| parent | 1c1161870c8bcb0d966ebbf1aec05a87a79a4175 (diff) | |
| download | linux-7cc8e58d53cd2295c3c1cee7b503bd1790ea4486.tar.bz2 | |
Btrfs: fix unprotected device's variants on 32bits machine
->total_bytes,->disk_total_bytes,->bytes_used is protected by chunk
lock when we change them, but sometimes we read them without any lock,
and we might get unexpected value. We fix this problem like inode's
i_size.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/dev-replace.c')
| -rw-r--r-- | fs/btrfs/dev-replace.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 1be03d85d267..da7ac1432b15 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -418,7 +418,7 @@ int btrfs_dev_replace_start(struct btrfs_root *root, /* the disk copy procedure reuses the scrub code */ ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, - src_device->total_bytes, + btrfs_device_get_total_bytes(src_device), &dev_replace->scrub_progress, 0, 1); ret = btrfs_dev_replace_finishing(root->fs_info, ret); @@ -555,11 +555,12 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, 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; + btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); + btrfs_device_set_disk_total_bytes(tgt_device, + src_device->disk_total_bytes); + btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); ASSERT(list_empty(&src_device->resized_list)); tgt_device->commit_total_bytes = src_device->commit_total_bytes; - tgt_device->bytes_used = src_device->bytes_used; tgt_device->commit_bytes_used = src_device->bytes_used; if (fs_info->sb->s_bdev == src_device->bdev) fs_info->sb->s_bdev = tgt_device->bdev; @@ -650,6 +651,7 @@ 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; + struct btrfs_device *srcdev; btrfs_dev_replace_lock(dev_replace); /* even if !dev_replace_is_valid, the values are good enough for @@ -672,8 +674,9 @@ void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, break; case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: + srcdev = dev_replace->srcdev; args->status.progress_1000 = div64_u64(dev_replace->cursor_left, - div64_u64(dev_replace->srcdev->total_bytes, 1000)); + div64_u64(btrfs_device_get_total_bytes(srcdev), 1000)); break; } btrfs_dev_replace_unlock(dev_replace); @@ -832,7 +835,7 @@ static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, dev_replace->committed_cursor_left, - dev_replace->srcdev->total_bytes, + 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); |