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btrfs-progs: extract metadata restore read code into its own helper

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For metadata restore, our logical address is mapped to a single device
with logical address 1:1 mapped to device physical address.

Move this part of code into a helper, this will make later extent buffer
read path refactoer much easier.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-04-05 20:48:24 +08:00 committed by David Sterba
parent 7a0c4b5dc1
commit 01c25d73f1
1 changed files with 43 additions and 28 deletions
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39
kernel-shared/disk-io.c
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@ -291,6 +291,30 @@ out:
}
static int read_on_restore(struct extent_buffer *eb)
{
struct btrfs_fs_info *fs_info = eb->fs_info;
struct btrfs_device *device;
int ret;
/*
* For on_restoring mode, there should be only one device, and logical
* address is mapped 1:1 to device physical offset.
*/
list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
if (device->devid == 1)
break;
}
device->total_ios++;
ret = btrfs_pread(device->fd, eb->data, eb->len, eb->start,
eb->fs_info->zoned);
if (ret != eb->len)
ret = -EIO;
else
ret = 0;
return ret;
}
int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
{
@ -305,7 +329,9 @@ int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirr
read_len = bytes_left;
device = NULL;
if (!info->on_restoring) {
if (info->on_restoring)
return read_on_restore(eb);
ret = btrfs_map_block(info, READ, eb->start + offset,
&read_len, &multi, mirror, NULL);
if (ret) {
@ -325,17 +351,6 @@ int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirr
eb->dev_bytenr = multi->stripes[0].physical;
kfree(multi);
multi = NULL;
} else {
/* special case for restore metadump */
list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
if (device->devid == 1)
break;
}
eb->fd = device->fd;
eb->dev_bytenr = eb->start;
device->total_ios++;
}
if (read_len > bytes_left)
read_len = bytes_left;