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btrfs: warn about dev extents that are inside the reserved range

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Btrfs on-disk format has reserved the first 1MiB for the primary super
block (at 64KiB offset) and bootloaders may also use this space.

This behavior is only introduced since v4.1 btrfs-progs release,
although kernel can ensure we never touch the reserved range of super
blocks, it's better to inform the end users, and a balance will resolve
the problem.

Signed-off-by: Qu Wenruo <wqu@suse.com>
[ update changelog and message ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-06-13 15:06:35 +08:00 committed by David Sterba
parent 37f85ec320
commit 3613249a1b
1 changed files with 10 additions and 0 deletions
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10
fs/btrfs/volumes.c
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@ -7996,6 +7996,16 @@ static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
goto out;
}
/*
* Very old mkfs.btrfs (before v4.1) will not respect the reserved
* space. Although kernel can handle it without problem, better to warn
* the users.
*/
if (physical_offset < BTRFS_DEVICE_RANGE_RESERVED)
btrfs_warn(fs_info,
"devid %llu physical %llu len %llu inside the reserved space",
devid, physical_offset, physical_len);
for (i = 0; i < map->num_stripes; i++) {
if (map->stripes[i].dev->devid == devid &&
map->stripes[i].physical == physical_offset) {