On aarch64 with pagesize 64k, btrfs-convert of ext4 is successful,
but it won't mount because we don't yet support subpage blocksize/
sectorsize.
BTRFS error (device vda): sectorsize 4096 not supported yet, only support 65536
So in this case during convert provide a warning and a 10s delay to
terminate the command.
For example:
WARNING: Blocksize 4096 is not equal to the pagesize 65536,
converted filesystem won't mount on this system.
The operation will start in 10 seconds. Use Ctrl-c to stop it.
10 9 8 7 6 5 4^C
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
convert/main.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/convert/main.c b/convert/main.c
index a04ec7a36abf..f936ec37d30a 100644
--- a/convert/main.c
+++ b/convert/main.c
@@ -1140,6 +1140,21 @@ static int do_convert(const char *devname, u32 convert_flags, u32 nodesize,
error("block size is too small: %u < 4096", blocksize);
goto fail;
}
+ if (blocksize != getpagesize()) {
+ int delay = 10;
+
+ warning("Blocksize %u is not equal to the pagesize %u,\n\
+ converted filesystem won't mount on this system.\n\
+ The operation will start in %d seconds. Use Ctrl-C to stop it.",
+ blocksize, getpagesize(), delay);
+
+ while (delay) {
+ printf("%2d", delay--);
+ fflush(stdout);
+ sleep(1);
+ }
+ }
+
if (btrfs_check_nodesize(nodesize, blocksize, features))
goto fail;
fd = open(devname, O_RDWR);
--
1.8.3.1
