Please add support for ioctl

[pavel-odintsov]

Hello!

I'm interested in mounting specific block device with partitions but I can't do it now because ioctl calls is not supported:

modprobe nbd max_part=16
partx -a /dev/nbd0 
HDIO_GETGEO: Inappropriate ioctl for device

You can find strace here:

strace -s 1024 -f partx -a /dev/nbd0 
execve("/sbin/partx", ["partx", "-a", "/dev/nbd0"], [/* 22 vars */]) = 0
brk(0)                                  = 0x1ab0000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a2ed83000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=50992, ...}) = 0
mmap(NULL, 50992, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8a2ed76000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\355\1\0\0\0\0\0@\0\0\0\0\0\0\0\30,\35\0\0\0\0\0\0\0\0\0@\0008\0\n\0@\0J\0I\0\6\0\0\0\5\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0000\2\0\0\0\0\0\0000\2\0\0\0\0\0\0\10\0\0\0\0\0\0\0\3\0\0\0\4\0\0\0\300\235\25\0\0\0\0\0\300\235\25\0\0\0\0\0\300\235\25\0\0\0\0\0\34\0\0\0\0\0\0\0\34\0\0\0\0\0\0\0\20\0\0\0\0\0\0\0\1\0\0\0\5\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\360\224\30\0\0\0\0\0\360\224\30\0\0\0\0\0\0\0 \0\0\0\0\0\1\0\0\0\6\0\0\0\0\227\30\0\0\0\0\0\0\2278\0\0\0\0\0\0\2278\0\0\0\0\0\230F\0\0\0\0\0\0\250\221\0\0\0\0\0\0\0\0 \0\0\0\0\0\2\0\0\0\6\0\0\0@\313\30\0\0\0\0\0@\3138\0\0\0\0\0@\3138\0\0\0\0\0\360\1\0\0\0\0\0\0\360\1\0\0\0\0\0\0\10\0\0\0\0\0\0\0\4\0\0\0\4\0\0\0p\2\0\0\0\0\0\0p\2\0\0\0\0\0\0p\2\0\0\0\0\0\0D\0\0\0\0\0\0\0D\0\0\0\0\0\0\0\4\0\0\0\0\0\0\0\7\0\0\0\4\0\0\0\0\227\30\0\0\0\0\0\0\2278\0\0\0\0\0\0\2278\0\0\0\0\0\20\0\0\0\0\0\0\0h\0\0\0\0\0\0\0\10\0\0\0\0\0\0\0P\345td\4\0\0\0\334\235\25\0\0\0\0\0\334\235\25\0\0\0\0\0\334\235\25\0\0\0\0\0\374e\0\0\0\0\0\0\374e\0\0\0\0\0\0\4\0\0\0\0\0\0\0Q\345td\6\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\0\0\0\0\0\0\0\0\0\0\0\10\0\0\0\0\0\0\0R\345td\4\0\0\0\0\227\30\0\0\0\0\0\0\2278\0\0\0\0\0\0\2278\0\0\0\0\0\0009\0\0\0\0\0\0\0009\0\0\0\0\0\0\1\0\0\0\0\0\0\0\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\35m{:\f\361W\23\20\372\266\342\225\10\355\336\341\24i\245\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\2\0\0\0\6\0\0\0\22\0\0\0\0\0\0\0\363\3\0\0\t\0\0\0\0\1\0\0\16\0\0\0\0000\20D\240 \2\1\210\3\346\220\305E\214\0\300\0\10\0\5\200\0`\300\200\0\r\212\f\0\4\20\0\210D2\10.@\210P4, \16\"H&\204\300\214\4\10\0\2\2\16\241\254\32\4f\300\0\3002\0\300\0P\1 \201\10\204\v  ($\0\4 P\0\20X\200\312DB(\0\6\200\20\30B\0 @\200\0\tP\0Q\212@\20\0\0\0\0\10\0\0\21\20", 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1916568, ...}) = 0
mmap(NULL, 3745960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8a2e7d2000
mprotect(0x7f8a2e95c000, 2093056, PROT_NONE) = 0
mmap(0x7f8a2eb5b000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x189000) = 0x7f8a2eb5b000
mmap(0x7f8a2eb60000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8a2eb60000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a2ed75000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a2ed74000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a2ed73000
arch_prctl(ARCH_SET_FS, 0x7f8a2ed74700) = 0
mprotect(0x7f8a2eb5b000, 16384, PROT_READ) = 0
mprotect(0x7f8a2ed84000, 4096, PROT_READ) = 0
munmap(0x7f8a2ed76000, 50992)           = 0
brk(0)                                  = 0x1ab0000
brk(0x1ad1000)                          = 0x1ad1000
open("/dev/nbd0", O_RDONLY)             = 3
ioctl(3, 0x301, 0x7fff58d147d0)         = -1 ENOTTY (Inappropriate ioctl for device)
dup(2)                                  = 4
fcntl(4, F_GETFL)                       = 0x8002 (flags O_RDWR|O_LARGEFILE)
fstat(4, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a2ed82000
lseek(4, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
write(4, "HDIO_GETGEO: Inappropriate ioctl for device\n", 44HDIO_GETGEO: Inappropriate ioctl for device
) = 44
close(4)                                = 0
munmap(0x7f8a2ed82000, 4096)            = 0
exit_group(1)                           = ?

Please fix it...

[acozzette]

Thanks for the bug report--unfortunately I'm not actively working on this project anymore, so I am afraid I am not going to be able to fix this one. Feel free to send me a pull request, though.