From: Andy Adamson <andros@xxxxxxxxxx>
Export nfsd4_pnfs_dlm_layoutget for dlm cluster file system use.
Use the number of data servers as a hash mask and hash inode i_ino
to choose the layout's first_stripe_index.
Always give out whole file layouts.
Always give out IOMODE_READ layouts. DLM locking semantics want to stripe
only READs with WRITEs going through the MDS.
[was pnfsd: hardwire DLM file layout layoutget]
[was pnfs-gfs2: initial LAYOUT* work for pNFS/GFS2 integration]
Frank Filz's work on the layout_type() and layout_get() export operations,
with stubs for layout_commit() and layout_return(). Tested at Connectathon.
Signed-off-by: Frank Filz <ffilzlnx@xxxxxxxxxx>
Signed-off-by: David M. Richter <richterd@xxxxxxxxxxxxxx>
[pnfs-gfs2: convert to using new pnfs export api]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
[pnfsd: gfs2 layout_type interface]
Signed-off-by: Marc Eshel <eshel@xxxxxxxxxxxxxxx>
[Since GFS2 only uses a stripe of one, changed lg_commit_through_mds from
true to false.]
[pnfsd: move and rename nfsd4_pnfs_fl_layoutget]
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
[pnfsd: get rid of layout encoding function vector]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
Acked-by: Steven Whitehouse <swhiteho@xxxxxxxxxx>
[pnfsd: rename deviceid_t struct pnfs_deviceid]
[pnfsd: clean up layoutget export API]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfsd/nfs4pnfsdlm.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 89 insertions(+), 0 deletions(-)
diff --git a/fs/nfsd/nfs4pnfsdlm.c b/fs/nfsd/nfs4pnfsdlm.c
index 5ed542f..db3ae1d 100644
--- a/fs/nfsd/nfs4pnfsdlm.c
+++ b/fs/nfsd/nfs4pnfsdlm.c
@@ -289,3 +289,92 @@ out:
dprintk("<-- %s returns %d\n", __func__, err);
return err;
}
+
+static int get_stripe_unit(int blocksize)
+{
+ if (blocksize >= NFSSVC_MAXBLKSIZE)
+ return blocksize;
+ return NFSSVC_MAXBLKSIZE - (NFSSVC_MAXBLKSIZE % blocksize);
+}
+
+/*
+ * Look up inode block device in pnfs_dlm_device list.
+ * Hash on the inode->i_ino and number of data servers.
+ */
+static int dlm_ino_hash(struct inode *ino)
+{
+ struct dlm_device_entry *de;
+ u32 hash_mask = 0;
+
+ /* If can't find the inode block device in the pnfs_dlm_deivce list
+ * then don't hand out a layout
+ */
+ de = nfsd4_find_pnfs_dlm_device(ino->i_sb->s_bdev->bd_disk->disk_name);
+ if (!de)
+ return -EINVAL;
+ hash_mask = de->num_ds - 1;
+ return ino->i_ino & hash_mask;
+}
+
+static int nfsd4_pnfs_dlm_layoutget(struct inode *inode,
+ struct exp_xdr_stream *xdr,
+ const struct nfsd4_pnfs_layoutget_arg *args,
+ struct nfsd4_pnfs_layoutget_res *res)
+{
+ struct pnfs_filelayout_layout *layout = NULL;
+ struct knfsd_fh *fhp = NULL;
+ int rc = 0, index;
+
+ dprintk("%s: LAYOUT_GET\n", __func__);
+
+ index = dlm_ino_hash(inode);
+ dprintk("%s first stripe index %d i_ino %lu\n", __func__, index,
+ inode->i_ino);
+ if (index < 0)
+ return index;
+
+ res->lg_seg.layout_type = LAYOUT_NFSV4_FILES;
+ /* Always give out whole file layouts */
+ res->lg_seg.offset = 0;
+ res->lg_seg.length = NFS4_MAX_UINT64;
+ /* Always give out READ ONLY layouts */
+ res->lg_seg.iomode = IOMODE_READ;
+
+ layout = kzalloc(sizeof(*layout), GFP_KERNEL);
+ if (layout == NULL) {
+ rc = -ENOMEM;
+ goto error;
+ }
+
+ /* Set file layout response args */
+ layout->lg_layout_type = LAYOUT_NFSV4_FILES;
+ layout->lg_stripe_type = STRIPE_SPARSE;
+ layout->lg_commit_through_mds = false;
+ layout->lg_stripe_unit = get_stripe_unit(inode->i_sb->s_blocksize);
+ layout->lg_fh_length = 1;
+ layout->device_id.fsid = args->lg_fsid;
+ layout->device_id.devid = 1; /*FSFTEMP*/
+ layout->lg_first_stripe_index = index; /*FSFTEMP*/
+ layout->lg_pattern_offset = 0;
+
+ fhp = kmalloc(sizeof(*fhp), GFP_KERNEL);
+ if (fhp == NULL) {
+ rc = -ENOMEM;
+ goto error;
+ }
+
+ memcpy(fhp, args->lg_fh, sizeof(*fhp));
+ pnfs_fh_mark_ds(fhp);
+ layout->lg_fh_list = fhp;
+
+ /* Call nfsd to encode layout */
+ rc = filelayout_encode_layout(xdr, layout);
+exit:
+ kfree(layout);
+ kfree(fhp);
+ return rc;
+
+error:
+ res->lg_seg.length = 0;
+ goto exit;
+}
--
1.6.5.1
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