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NFS: ask for layouttypes during v4 fsinfo call 

This information will be used to determine which layout driver,
if any, to use for subsequent IO on this filesystem.  Each driver
is assigned an integer id, with 0 reserved to indicate no driver.

The server can in theory return multiple ids.  However, our current
client implementation only notes the first entry and ignores the
rest.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2010-10-20 00:17:57 -04:00 committed by Trond Myklebust
parent 9449925273
commit 504913fbc8
3 changed files with 60 additions and 0 deletions
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1
fs/nfs/nfs4proc.c
View File

@ -130,6 +130,7 @@ const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
| FATTR4_WORD0_MAXWRITE
| FATTR4_WORD0_LEASE_TIME,
FATTR4_WORD1_TIME_DELTA
| FATTR4_WORD1_FS_LAYOUT_TYPES
};
const u32 nfs4_fs_locations_bitmap[2] = {

58
fs/nfs/nfs4xdr.c
View File

@ -3978,6 +3978,61 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
return decode_getfattr_generic(xdr, fattr, NULL, server, may_sleep);
}
/*
* Decode potentially multiple layout types. Currently we only support
* one layout driver per file system.
*/
static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
uint32_t *layouttype)
{
uint32_t *p;
int num;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
num = be32_to_cpup(p);
/* pNFS is not supported by the underlying file system */
if (num == 0) {
*layouttype = 0;
return 0;
}
if (num > 1)
printk(KERN_INFO "%s: Warning: Multiple pNFS layout drivers "
"per filesystem not supported\n", __func__);
/* Decode and set first layout type, move xdr->p past unused types */
p = xdr_inline_decode(xdr, num * 4);
if (unlikely(!p))
goto out_overflow;
*layouttype = be32_to_cpup(p);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* The type of file system exported.
* Note we must ensure that layouttype is set in any non-error case.
*/
static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
uint32_t *layouttype)
{
int status = 0;
dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
return -EIO;
if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
status = decode_first_pnfs_layout_type(xdr, layouttype);
bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
} else
*layouttype = 0;
return status;
}
static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
{
__be32 *savep;
@ -4004,6 +4059,9 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
goto xdr_error;
fsinfo->wtpref = fsinfo->wtmax;
status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
if (status != 0)
goto xdr_error;
status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
if (status != 0)
goto xdr_error;

1
include/linux/nfs_xdr.h
View File

@ -114,6 +114,7 @@ struct nfs_fsinfo {
__u64 maxfilesize;
struct timespec time_delta; /* server time granularity */
__u32 lease_time; /* in seconds */
__u32 layouttype; /* supported pnfs layout driver */
};
struct nfs_fsstat {