Messages in this thread | | | Date | Thu, 07 Sep 2006 15:19:24 +0200 | From | Christian Schmid <> | Subject | Problems with large block devices in 64 bit kernels |
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Andries Brouwer wrote:
> On Wed, Sep 06, 2006 at 10:54:42PM +0200, Christian Schmid wrote: > >> I run kernel 2.6.17.11 vanilla in 64 bit mode with 32 bit emulation. >> model name : Intel(R) Xeon(R) CPU 5150 @ 2.66GHz >> >> Unfortunately there is no support for file-systems bigger than 2 TB in 64-bit mode with 32-bit emulation. >> >> erikm in #kernelnewbies told me to report it here: >> >> <Dragony> statfs("/MD2", 0xff8deca4) = -1 EOVERFLOW (Value too large for defined data type) > > > > Hmm. statfs uses struct statfs which has a 4-byte f_blocks field, > and hence cannot hold larger values. You get what you ask for. > > statfs64 uses struct statfs64 which uses an 8-byte f_blocks field. > > (And then there is statvfs.) > > Andries
Hmm I dont think its that easy. Actually the max. value is 16 TB because of 232*4096 (block-size) and this works on a 32 bit kernel.
df on 32 bit kernel: (See attached image. Sorry, this kernel has not the required network-driver included. Had to take a screenshot)
SAME df on 64 bit kernel: write(1, "Filesystem 1K-blocks "..., 67Filesystem 1K-blocks Used Available Use% Mounted on ) = 67 statfs("/", {f_type=0x58465342, f_bsize=4096, f_blocks=732384, f_bfree=508015, f_files=2939776, f_ffree=2901955, f_namelen=255}) = 0 write(1, "/dev/md0 2929536 "..., 58/dev/md0 2929536 897476 2032060 31% / ) = 58 statfs("/proc", {f_type="PROC_SUPER_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_files=0, f_ffree=0, f_namelen=255}) = 0 statfs("/MD1", {f_type=0x58465342, f_bsize=4096, f_blocks=4407104, f_bfree=4403156, f_files=17638656, f_ffree=17638645, f_namelen=255}) = 0 write(1, "/dev/md1 17628416 "..., 61/dev/md1 17628416 15792 17612624 1% /MD1 ) = 61 statfs("/MD2", 0xffa30614) = -1 EOVERFLOW (Value too large for defined data type) write(2, "df: ", 4df: ) = 4 write(2, "`/MD2\'", 6`/MD2') = 6 write(2, ": Value too large for defined da"..., 39: Value too large for defined data type) = 39 write(2, "\n", 1 ) = 1 statfs("/dev/pts", {f_type=0x1cd1, f_bsize=4096, f_blocks=0, f_bfree=0, f_files=0, f_ffree=0, f_namelen=255}) = 0 munmap(0xf7eea000, 4096) = 0
So its definetly something with the kernel.
Regards, Christian Schmid [image] | |