On 2016-03-21 02:37, Martin Volf wrote:
Hello,
I have just tried the new "btrfs fi du" command from btrfs-progs 4.5
on 4.4.6 linux kernel, and it gave me:
# btrfs fi du /bin
Total Exclusive Set shared Filename
(many lines of output for individual files, probably OK)
...
ERROR: cannot check space of '/bin': Unknown error -1
The -1 is ETXTBSY in this case:
# strace -o log btrfs fi du /bin &>/dev/null; tail log
newfstatat(3, "login", {st_mode=S_IFREG|0755, st_size=44784, ...}, 0) = 0
stat("/bin/login", {st_mode=S_IFREG|0755, st_size=44784, ...}) = 0
open("/bin/login", O_RDWR) = -1 ETXTBSY (Text file busy)
close(3) = 0
write(2, "ERROR: ", 7) = 7
write(2, "cannot check space of '/bin': Un"..., 46) = 46
write(2, "\n", 1) = 1
write(1, " Total Exclusive Set shar"..., 3161) = 3161
exit_group(1) = ?
+++ exited with 1 +++
Read-only snapshots give Unknown error -1 too, this time EROFS.
Is it expected?
Given that we're apparently trying to open the file with O_RDWR, yes
that is expected. What's not expected is that we're opening the file
writable...
I'll see if I can get a patch put together some time today to fix that.
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