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...ack to manual zeroing. Check if the underlying file is a block device when opening the file, and fall back to ioctl(BLKZEROOUT) for aligned zero requests for a block device. Here is an example run without this change on RHEL 7.5: $ export SOCK=/tmp/nbd.sock $ export BLOCK=/dev/e30bfac2-8e13-479d-8cd6-c6da5e306c4e/c9864222-bc52-4359-80d7-76e47d619b15 $ src/nbdkit plugins/file/.libs/nbdkit-file-plugin.so file=$BLOCK -U $SOCK $ time qemu-img convert -n -f raw -O raw /var/tmp/fedora-27.img nbd:unix:/tmp/nbd.sock real 0m11.563s user 0m0.219s sys 0m0.746s $ time qemu-img convert -n -f raw -O raw -...

...kernel, but when it is not, we fall back to manual zeroing. For block device, try also to use ioctl(BLKZEROOUT) if offset and count are aligned to block device sector size. Here is an example run without this change on RHEL 7.5: $ export SOCK=/tmp/nbd.sock $ export BLOCK=/dev/e30bfac2-8e13-479d-8cd6-c6da5e306c4e/c9864222-bc52-4359-80d7-76e47d619b15 $ src/nbdkit plugins/file/.libs/nbdkit-file-plugin.so file=$BLOCK -U $SOCK $ time qemu-img convert -n -f raw -O raw /var/tmp/fedora-27.img nbd:unix:/tmp/nbd.sock real 0m11.563s user 0m0.219s sys 0m0.746s $ time qemu-img convert -n -f raw -O raw -...

...kernel, but when it is not, we fall back to manual zeroing. For block device, try also to use ioctl(BLKZEROOUT) if offset and count are aligned to block device sector size. Here is an example run without this change on RHEL 7.5: $ export SOCK=/tmp/nbd.sock $ export BLOCK=/dev/e30bfac2-8e13-479d-8cd6-c6da5e306c4e/c9864222-bc52-4359-80d7-76e47d619b15 $ src/nbdkit plugins/file/.libs/nbdkit-file-plugin.so file=$BLOCK -U $SOCK $ time qemu-img convert -n -f raw -O raw /var/tmp/fedora-27.img nbd:unix:/tmp/nbd.sock real 0m11.563s user 0m0.219s sys 0m0.746s $ time qemu-img convert -n -f raw -O raw -...

...ies, so once we discover that an operation is not supported, we never try it again. Here are examples runs on a server based on Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz, using XtremIO storage via 4G FC HBA and 4 paths to storage. $ export SOCK=/tmp/nbd.sock $ export BLOCK=/dev/e30bfac2-8e13-479d-8cd6-c6da5e306c4e/c9864222-bc52-4359-80d7-76e47d619b15 $ src/nbdkit -f plugins/file/.libs/nbdkit-file-plugin.so file=$BLOCK -U $SOCK $ time qemu-img convert -n -f raw -O raw /var/tmp/fedora-27.img nbd:unix:$SOCK real 0m2.741s user 0m0.224s sys 0m0.634s $ time qemu-img convert -n -f raw -O raw -W /va...

This is the second version to support efficient zero for block devices on older kernels (e.g. RHEL 7.5), and file systems that do not support yet FALLOC_FS_ZERO_RANGE (e.g. NFS 4.2). Changes since v1: - Split to smaller patches - Skip linux only includes on other systems - Skip code using BLKZEROOUT if the macro is not defined - Try BLKZEROOUT only if the offset and count are aligned to device

...ies, so once we discover that an operation is not supported, we never try it again. Here are examples runs on a server based on Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz, using XtremIO storage via 4G FC HBA and 4 paths to storage. $ export SOCK=/tmp/nbd.sock $ export BLOCK=/dev/e30bfac2-8e13-479d-8cd6-c6da5e306c4e/c9864222-bc52-4359-80d7-76e47d619b15 $ src/nbdkit -f plugins/file/.libs/nbdkit-file-plugin.so file=$BLOCK -U $SOCK $ time qemu-img convert -n -f raw -O raw /var/tmp/fedora-27.img nbd:unix:$SOCK real 0m2.741s user 0m0.224s sys 0m0.634s $ time qemu-img convert -n -f raw -O raw -W /va...

This version addresses some of the comments on v2. Changes since v2: - file_zero: Add missing space in function call - is_aligned: Assert that align is indeed a power of 2 - Spelling in commit message Not changed: - Eric commented that spacing was off: https://www.redhat.com/archives/libguestfs/2018-August/msg00113.html but I could not find anything wrong. - Eric asked if ioctl.h will cause

This version addresses comments on v3. Changes since v3: - Finally got spacing right (Eric) - Reorder includes (Richard) - Return 0 or -1 instead of r (Richard) - Add common/include/isaligned.h to Makefile.am (Richard) v3 was here: https://www.redhat.com/archives/libguestfs/2018-August/msg00177.html Nir Soffer (4): file: Avoid unsupported fallocate() calls file: Support zero without

This is the third version to support efficient zero for block devices on older kernels (e.g. RHEL 7.5), and file systems that do not support yet FALLOC_FS_ZERO_RANGE (e.g. NFS 4.2). Changes since v2: - Revert file_can_trim change, since it is too late to change the value after negotiation. Changing the capability dinamically may be useful internally, but it should be done via other means. -

...ction L"Adobe_ProcessPropertyFile" from L"C:\\users\\andrey\\Temp\\msi28d.tmp" trace:msi:wait_thread_handle waiting for L"ProcessPropertyFile.E35C3ECB_5FDA_49E1_AB1F_D472B7CB9017" trace:msi:DllThread custom action (23) started trace:msi:ACTION_CallDllFunction {de5c6564-8cd6-4b1f-a07f-d66f2a53bcf8} trace:msi:DllGetClassObject {ba26e6fa-4f27-4f56-953a-3f90272018aa} {00000001-0000-0000-c000-000000000046} 0x173ea08 trace:msi:MsiCF_CreateInstance 0x7db8d288 (nil) {56d58b64-8780-4c22-a8bc-8b0b29e4a9f8} 0x173ea04 trace:msi:alloc_msihandle 0x166f20 -> 1 trace:msi:alloc_msi...