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Since commit5634622bcb("file-posix: allow BLKZEROOUT with -t writeback"), qemu-img create errors out on a Linux loop block device with a 4 KB sector size: # dd if=/dev/zero of=blockfile bs=1M count=1024 # losetup --sector-size 4096 /dev/loop0 blockfile # qemu-img create -f raw /dev/loop0 1G Formatting '/dev/loop0', fmt=raw size=1073741824 qemu-img: /dev/loop0: Failed to clear the new image's first sector: Invalid argument Use the pwrite_zeroes_alignment block limit to avoid misaligned fallocate(2) or ioctl(BLKZEROOUT) in the block/file-posix.c block driver. Cc: qemu-stable@nongnu.org Fixes:5634622bcb("file-posix: allow BLKZEROOUT with -t writeback") Reported-by: Jean-Louis Dupond <jean-louis@dupond.be> Buglink: https://gitlab.com/qemu-project/qemu/-/issues/3127 Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20251007141700.71891-3-stefanha@redhat.com> Tested-by: Fiona Ebner <f.ebner@proxmox.com> Reviewed-by: Fiona Ebner <f.ebner@proxmox.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> (cherry picked from commitd704a13d2c) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>