[LU-2221] Kerberos support for kernel >= 2.6.24 is broken

• Type: Improvement
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.3.0
• Labels: kerberos patch
• Environment: Linux distributions running kernel >= 2.6.24

Epic

client server

• Assignee: nasf (Inactive)
• Reporter: Thomas Stibor

Description

Since kernel version 2.6.24 the scatterlist struct has no field "page".
The related Lustre kerberos code in gss_krb5_mech.c is not working anymore,
as for instance:

static
void buf_to_sg(struct scatterlist *sg, void *ptr, int len)
{
sg->page = virt_to_page(ptr);
sg->offset = offset_in_page(ptr);
sg->length = len;
}

access the field page in scatterlist struct.

The new struct provided in the Linux kernel >= 2.6.24 is

struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
dma_addr_t dma_address;
unsigned int dma_length;
};

The problem can be fixed by using the scatterlist sg_set_page function, e.g:

static
void buf_to_sg(struct scatterlist *sg, void *ptr, int len)

{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) + sg_set_page(sg, virt_to_page(ptr), + len, offset_in_page(ptr)); +#else sg->page = virt_to_page(ptr); sg->offset = offset_in_page(ptr); sg->length = len; +#endif }

I will prepare a patch to fix this problem.

Issue Links

• is duplicated by: LU-867 Fails to build with gss (lustre 2.1)