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author | Nikolay Borisov <nborisov@suse.com> | 2020-07-16 10:25:33 +0300 |
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committer | David Sterba <dsterba@suse.com> | 2020-10-07 13:06:58 +0300 |
commit | 944d3f9fac61e24e13a056b25974df3831994f29 (patch) | |
tree | 4c0d57b0ee08af868fa53ef46977a4d24919e2fe /fs/btrfs/disk-io.c | |
parent | c4989c2fd0eba6e164e9a29c4a865e57dd644451 (diff) | |
download | linux-944d3f9fac61e24e13a056b25974df3831994f29.tar.xz |
btrfs: switch seed device to list api
While this patch touches a bunch of files the conversion is
straighforward. Instead of using the implicit linked list anchored at
btrfs_fs_devices::seed the code is switched to using
list_for_each_entry.
Previous patches in the series already factored out code that processed
both main and seed devices so in those cases the factored out functions
are called on the main fs_devices and then on every seed dev inside
list_for_each_entry.
Using list api also allows to simplify deletion from the seed dev list
performed in btrfs_rm_device and btrfs_rm_dev_replace_free_srcdev by
substituting a while() loop with a simple list_del_init.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r-- | fs/btrfs/disk-io.c | 39 |
1 files changed, 18 insertions, 21 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index a496219baa39..84799ef76758 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -545,33 +545,30 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page) static int check_tree_block_fsid(struct extent_buffer *eb) { struct btrfs_fs_info *fs_info = eb->fs_info; - struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs; u8 fsid[BTRFS_FSID_SIZE]; - int ret = 1; + u8 *metadata_uuid; read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid), BTRFS_FSID_SIZE); - while (fs_devices) { - u8 *metadata_uuid; + /* + * Checking the incompat flag is only valid for the current fs. For + * seed devices it's forbidden to have their uuid changed so reading + * ->fsid in this case is fine + */ + if (btrfs_fs_incompat(fs_info, METADATA_UUID)) + metadata_uuid = fs_devices->metadata_uuid; + else + metadata_uuid = fs_devices->fsid; - /* - * Checking the incompat flag is only valid for the current - * fs. For seed devices it's forbidden to have their uuid - * changed so reading ->fsid in this case is fine - */ - if (fs_devices == fs_info->fs_devices && - btrfs_fs_incompat(fs_info, METADATA_UUID)) - metadata_uuid = fs_devices->metadata_uuid; - else - metadata_uuid = fs_devices->fsid; + if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) + return 0; - if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) { - ret = 0; - break; - } - fs_devices = fs_devices->seed; - } - return ret; + list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list) + if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE)) + return 0; + + return 1; } static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio, |