[2.2.8] various Linux kernel updates #17325
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For UIO_ITER, we are just wrapping a kernel iterator. It will take care of its own offsets if necessary. We don't need to do anything, and if we do try to do anything with it (like advancing the iterator by the skip in zfs_uio_advance) we're just confusing the kernel iterator, ending up at the wrong position or worse, off the end of the memory region. Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Tony Hutter <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Tino Reichardt <[email protected]> Reviewed-by: Brian Atkinson <[email protected]> Signed-off-by: Rob Norris <[email protected]> Closes openzfs#17298 (cherry picked from commit 2ee5b51)
This is a convenience for filesystems that need the inode of their parent or their own name, as its often complicated to get that information. We don't need those things, so this is just detecting which prototype is expected and adjusting our callback to match. Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Tony Hutter <[email protected]> (cherry picked from commit 7ef6b70)
According to the upstream change, all callers set it, and all block devices either honoured it or ignored it, so removing it entirely allows a bunch of handling for the "unset" case to be removed, and it becomes effectively implied. We follow suit, and keep setting it for older kernels. Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Tony Hutter <[email protected]> (cherry picked from commit 2ca91ba)
since 4.10, bio->bi_opf needs to be checked to determine all kinds of flush requests. this was the case prior to the commit referenced below, but the order of ifdefs was not the usual one (newest up top), which might have caused this to slip through. this fixes a regression when using zvols as Qemu block devices, but might have broken other use cases as well. the symptoms are that all sync writes from within a VM configured to use such a virtual block devices are ignored and treated as async writes by the host ZFS layer. this can be verified using fio in sync mode inside the VM, for example with fio \ --filename=/dev/sda --ioengine=libaio --loops=1 --size=10G \ --time_based --runtime=60 --group_reporting --stonewall --name=cc1 \ --description="CC1" --rw=write --bs=4k --direct=1 --iodepth=1 \ --numjobs=1 --sync=1 which shows an IOPS number way above what the physical device underneath supports, with "zpool iostat -r 1" on the hypervisor side showing no sync IO occuring during the benchmark. with the regression fixed, both fio inside the VM and the IO stats on the host show the expected numbers. Fixes: 846b598 "config: remove HAVE_REQ_OP_* and HAVE_REQ_*" Signed-off-by: Fabian-Gruenbichler <[email protected]> Co-authored-by: Alexander Motin <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Tony Hutter <[email protected]> Closes openzfs#17131 (cherry picked from commit 41823a0)
It turns out that approach taken in the original version of the patch was wrong. So now, we're taking approach in-line with how kernel actually does it - when sb is being torn down, access to it is serialized via sb->s_umount rwsem, only when that lock is taken is it okay to work with s_flags - and the other mistake I was doing was trying to make SB_ACTIVE work, but apparently the kernel checks the negative variant - not SB_DYING and not SB_BORN. Kernels pre-6.6 don't have SB_DYING, but check if sb is hashed instead. Signed-off-by: Pavel Snajdr <[email protected]> Reviewed-by: Tony Hutter <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Closes: openzfs#17121 (cherry picked from commit a0e6271)
Avoids using fallback_migrate_folio, which starts unnecessary writeback (leading to BUG in migrate_folio_extra). Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Tony Hutter <[email protected]> Reviewed-by: Brian Atkinson <[email protected]> Signed-off-by: tstabrawa <[email protected]> Closes openzfs#16568 Closes openzfs#16723 (cherry picked from commit 7b6e967)
The 6.0 kernel removes the 'migratepage' VFS op. Check for migratepage. Signed-off-by: Tony Hutter <[email protected]> Reviewed-by: Rob Norris <[email protected]> Reviewed-by: Alexander Motin <[email protected] Closes openzfs#17217 (cherry picked from commit ab9bb19)
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@tonyhutter I dunno if a 2.2.8 is planned (probably entirely dependent on demand). If it does happen, I'm very happy to assist with testing to get it out the door. |
amotin
approved these changes
May 12, 2025
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I tried this on Fedora 42 (6.14 kernel) and wasn't able to get it to build. Pulling in 155847c helped, but then I hit: |
I didn't have any plans one way or the other, but I'd be open to a 2.2.8 release. |
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It seems #17334 would be good too. Though it is not in 2.3 yet. |
behlendorf
approved these changes
May 16, 2025
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Motivation and Context
Bring some Linux kernel version updates and bugfixes back to the 2.2 branch.
Description
Includes:
UIO_ITER#17298How Has This Been Tested?
Compile checked latest release of all LTS kernels back to 4.19, and all 6.x kernels.
Also compile checked on FreeBSD 14.2.
Types of changes
Checklist:
Signed-off-by.