Hi,
FWIW, ‘tests/blockwise-compat’ doesn't work consistently on all file
systems. With
BSIZE=$(stat -c "%o" $LOCAL_FILE) ## 4096
`./unit-utils-io $LOCAL_FILE read_buffer $((BSIZE-1))` fails with ext4
(on read()) and tmpfs (on open(O_DIRECT)), but succeeds with btrfs (and
possibly other file systems). The test-suite doesn't pass if that test
succeeds.
## ext4
$ strace -e trace=openat,read ./unit-utils-io $LOCAL_FILE read_buffer $((BSIZE-1))
[…]
openat(AT_FDCWD, "./blocwise_localfile", O_RDONLY|O_DIRECT) = 3
read(3, 0x55914c895000, 4095) = -1 EINVAL (Invalid argument)
+++ exited with 1 +++
## tmpfs
$ strace -e trace=openat,read ./unit-utils-io $LOCAL_FILE read_buffer $((BSIZE-1))
[…]
openat(AT_FDCWD, "./blocwise_localfile", O_RDONLY|O_DIRECT) = -1 EINVAL (Invalid argument)
Failed to open ./blocwise_localfile.
+++ exited with 1 +++
## btrfs
$ strace -e trace=openat,read ./unit-utils-io $LOCAL_FILE read_buffer $((BSIZE-1))
[…]
openat(AT_FDCWD, "./blocwise_localfile", O_RDONLY|O_DIRECT) = 3
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4095) = 4095
+++ exited with 0 +++
Just so you know :-)
Cheers,
--
Guilhem.
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