On Thu, Nov 11, 2010 at 12:32, Goffredo Baroncelli <kreijack@xxxxxxxxx> wrote:
> On Thursday, 11 November, 2010, Josh Berry wrote:
>> Hi,
>>
>> I have a cron script that runs periodically, taking new snapshots and
>> cleaning up old ones when space gets low on my filesystem. ÂThis
>> morning, the script suddenly stopped being able to remove snapshots.
>> When I tried to remove one manually, I got the following:
>>
>> # btrfs subvol del 2010-11-07-01:17:01
>> Delete subvolume '/btrfs/snapshot/2010-11-07-01:17:01'
>> ERROR: cannot delete '/btrfs/snapshot/2010-11-07-01:17:01'
>>
>> There is nothing in dmesg or in the above output to tell me what the
>> problem is, how to fix it, etc. ÂI'm running kernel 2.6.36, and I
>> updated btrfs-progs-unstable to the lastest Git revision
>> (1b444cd2e6...), with the same result.
>>
>> How do I diagnose this issue? ÂI'm not even sure where to start.
>
> This error is due to a failure during the ioctl. Could you "strace" btrfs
> subvolume delete ?
The strace is short enough that I've included it directly below:
# strace btrfs subvol del test
execve("/usr/local/bin/btrfs", ["btrfs", "subvol", "del", "test"], [/*
28 vars */]) = 0
brk(0) = 0xa04a000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb785e000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=36274, ...}) = 0
mmap2(NULL, 36274, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7855000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/libuuid.so.1", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\20\0\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=13276, ...}) = 0
mmap2(NULL, 15948, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0xb7851000
mmap2(0xb7854000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2) = 0xb7854000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i686/cmov/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320m\1\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1323460, ...}) = 0
mmap2(NULL, 1333608, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0xb770b000
mmap2(0xb784b000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13f) = 0xb784b000
mmap2(0xb784e000, 10600, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb784e000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb770a000
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7709000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb770ab60,
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xb784b000, 8192, PROT_READ) = 0
mprotect(0xb787c000, 4096, PROT_READ) = 0
munmap(0xb7855000, 36274) = 0
brk(0) = 0xa04a000
brk(0xa06b000) = 0xa06b000
stat64("test", {st_mode=S_IFDIR|0755, st_size=44, ...}) = 0
getcwd("/btrfs", 4096) = 7
lstat64("/btrfs/test", {st_mode=S_IFDIR|0755, st_size=44, ...}) = 0
stat64("/btrfs", {st_mode=S_IFDIR|0555, st_size=50, ...}) = 0
open("/btrfs", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3
fcntl64(3, F_GETFD) = 0x1 (flags FD_CLOEXEC)
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb785d000
write(1, "Delete subvolume '/btrfs/test'\n", 31Delete subvolume '/btrfs/test'
) = 31
ioctl(3, 0x5000940f, 0xbfe8fb30) = -1 ENOTEMPTY (Directory not empty)
close(3) = 0
write(2, "ERROR: cannot delete '/btrfs/tes"..., 35ERROR: cannot delete
'/btrfs/test'
) = 35
exit_group(11) = ?
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