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nfsd: allow nfsd to advertise multiple layout types 

If the underlying filesystem supports multiple layout types, then there
is little reason not to advertise that fact to clients and let them
choose what type to use.

Turn the ex_layout_type field into a bitfield. For each supported
layout type, we set a bit in that field. When the client requests a
layout, ensure that the bit for that layout type is set. When the
client requests attributes, send back a list of supported types.

Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Reviewed-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2016-07-10 15:55:58 -04:00 committed by J. Bruce Fields
parent 885848186f
commit 8a4c392688
5 changed files with 22 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/nfsd/export.c
View File

@ -706,7 +706,7 @@ static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
new->ex_fslocs.locations = NULL;
new->ex_fslocs.locations_count = 0;
new->ex_fslocs.migrated = 0;
new->ex_layout_type = 0;
new->ex_layout_types = 0;
new->ex_uuid = NULL;
new->cd = item->cd;
}
@ -731,7 +731,7 @@ static void export_update(struct cache_head *cnew, struct cache_head *citem)
item->ex_fslocs.locations_count = 0;
new->ex_fslocs.migrated = item->ex_fslocs.migrated;
item->ex_fslocs.migrated = 0;
new->ex_layout_type = item->ex_layout_type;
new->ex_layout_types = item->ex_layout_types;
new->ex_nflavors = item->ex_nflavors;
for (i = 0; i < MAX_SECINFO_LIST; i++) {
new->ex_flavors[i] = item->ex_flavors[i];

2
fs/nfsd/export.h
View File

@ -57,7 +57,7 @@ struct svc_export {
struct nfsd4_fs_locations ex_fslocs;
uint32_t ex_nflavors;
struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
enum pnfs_layouttype ex_layout_type;
u32 ex_layout_types;
struct nfsd4_deviceid_map *ex_devid_map;
struct cache_detail *cd;
};

6
fs/nfsd/nfs4layouts.c
View File

@ -139,21 +139,21 @@ void nfsd4_setup_layout_type(struct svc_export *exp)
* otherwise advertise the block layout.
*/
#ifdef CONFIG_NFSD_FLEXFILELAYOUT
exp->ex_layout_type = LAYOUT_FLEX_FILES;
exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES;
#endif
#ifdef CONFIG_NFSD_BLOCKLAYOUT
/* overwrite flex file layout selection if needed */
if (sb->s_export_op->get_uuid &&
sb->s_export_op->map_blocks &&
sb->s_export_op->commit_blocks)
exp->ex_layout_type = LAYOUT_BLOCK_VOLUME;
exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME;
#endif
#ifdef CONFIG_NFSD_SCSILAYOUT
/* overwrite block layout selection if needed */
if (sb->s_export_op->map_blocks &&
sb->s_export_op->commit_blocks &&
sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops)
exp->ex_layout_type = LAYOUT_SCSI;
exp->ex_layout_types |= 1 << LAYOUT_SCSI;
#endif
}

4
fs/nfsd/nfs4proc.c
View File

@ -1219,12 +1219,12 @@ nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
static const struct nfsd4_layout_ops *
nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
{
if (!exp->ex_layout_type) {
if (!exp->ex_layout_types) {
dprintk("%s: export does not support pNFS\n", __func__);
return NULL;
}
if (exp->ex_layout_type != layout_type) {
if (!(exp->ex_layout_types & (1 << layout_type))) {
dprintk("%s: layout type %d not supported\n",
__func__, layout_type);
return NULL;

30
fs/nfsd/nfs4xdr.c
View File

@ -2162,22 +2162,20 @@ nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
}
static inline __be32
nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
{
__be32 *p;
__be32 *p;
unsigned long i = hweight_long(layout_types);
if (layout_type) {
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(1);
*p++ = cpu_to_be32(layout_type);
} else {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0);
}
p = xdr_reserve_space(xdr, 4 + 4 * i);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(i);
for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
if (layout_types & (1 << i))
*p++ = cpu_to_be32(i);
return 0;
}
@ -2752,13 +2750,13 @@ out_acl:
}
#ifdef CONFIG_NFSD_PNFS
if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
if (status)
goto out;
}