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Thunderbird Subject: Re: [PATCH] btrfs-progs: docs: discourage root btrfs usage without an initramfs To: dsterba@suse.cz, Qu Wenruo Cc: linux-btrfs@vger.kernel.org References: <20260914171831.GP54722@twin.jikos.cz> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn xi+l5lRziV9ZGyYXp7N35a9t7GQJndMCFUWYoEa+1NCuxDs6bslfrCaGEGG/+wd6oIPb85xo 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tV0ob5kQaCFhkZ4kCpeBF1zpE8c8kXLWHddjlNU3HMr38s+jmySYm9B/+jQjibDguYAMxrpWy G3lje1V5ZvzuysDZZhPzs4nPN3l0qEEuDGXWfPnWLP6TLAJNWqnyWvABXoWqkxbUY2Q0Nd+/k 2s2prh43c2rjRu1/R2hnj917GnfQ9dqe94RghAOK80Xf5Zkluop1qSLHugboFs/KggAmFaMpv maboxal/tdRo4CtwFbwGXodAn7jbTHuzrPpKwEHBwgLRS00OCgggMyKYyrBQxYQr1qe4jg+pT PPx0ptWSULv1chEJ6VXrgoGWL0tpAFphgte/qFwD7laaqvg/PehK3GBsnrcqy1A/k= =E5=9C=A8 2026/9/15 02:48, David Sterba =E5=86=99=E9=81=93: > On Sat, Sep 12, 2026 at 06:55:32PM +0930, Qu Wenruo wrote: >> For multi-device btrfs, device scanning is required before mounting, an= d >> without an initramfs it's impossible to mount a multi-device btrfs. >> >> Even if the rootfs is a single-device btrfs, there is nothing preventin= g >> the end user to add a device to that btrfs, and fail the next boot. >> >> Signed-off-by: Qu Wenruo >> --- >> Documentation/mkfs.btrfs.rst | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/Documentation/mkfs.btrfs.rst b/Documentation/mkfs.btrfs.rs= t >> index 0d3d6051b0e7..0bc7b7ac3808 100644 >> --- a/Documentation/mkfs.btrfs.rst >> +++ b/Documentation/mkfs.btrfs.rst >> @@ -346,6 +346,10 @@ devices to scan at the time of mount. >> before all block devices are discovered. The waiting is usual= ly done on the >> initramfs/initrd systems. >> =20 >> + Thus using btrfs as a rootfs without an initramfs is not recom= mended. >> + Adding a new device to the rootfs can easily cause the next bo= ot to fail, as >> + there is no way to register all devices prior to mounting. >=20 > That's not a good placement, we should write a full section how to use > btrfs without initrd and what are the caveats. A paragraph burried in > mkfs will probably never got noticed. I'll add a dedicated chapter for device scan related behavior in man 5=20 btrfs. >=20 >> + >> .. warning:: >> RAID5/6 has known problems and should not be used in producti= on. >> =20 >> --=20 >> 2.55.0 >> >=20