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authorAndy Adamson <andros@netapp.com>2010-10-20 00:17:57 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-10-24 18:07:09 -0400
commit504913fbc84c00bba7224d73e4aab525c1731f7d (patch)
tree714cbd975b3786486a93df5aa8cca27dc626033f /fs
parent9449925273933d19235d7d36c1fd970841d055de (diff)
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/nfs4proc.c1
-rw-r--r--fs/nfs/nfs4xdr.c58
2 files changed, 59 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index e87fe612ca18..a5f1edb45b47 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -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] = {
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index bd2101d918c8..8b4dfa393f0f 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -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;
@@ -4006,6 +4061,9 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
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;
status = verify_attr_len(xdr, savep, attrlen);
xdr_error:

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