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| author | Qu Wenruo <wqu@suse.com> | 2022-06-13 10:06:35 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-07-25 18:45:36 +0300 |
| commit | 3613249a1b30ef6f7a7566e39878ea550af51049 (patch) | |
| tree | 72bc52a6157fc73af960aebd92b1ddf63821651c /fs/btrfs/volumes.c | |
| parent | 37f85ec320e6d73b92c8f8b5b2ddf33077970a23 (diff) | |
| download | linux-3613249a1b30ef6f7a7566e39878ea550af51049.tar.xz | |
btrfs: warn about dev extents that are inside the reserved range
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>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index e6af960a6961..076040310f6f 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -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) { |