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authorChristoph Hellwig <hch@lst.de>2016-03-04 20:46:17 +0100
committerJ. Bruce Fields <bfields@redhat.com>2016-03-18 11:42:53 -0400
commitf99d4fbdae6765d0bb4ed5441f6fa1f036122d59 (patch)
treeb2192caa11508d5107d2eea3be55c0ec68118e6c /fs/nfsd/nfs4layouts.c
parent368248eeb14d08823f1b53de83debd5fd6c108d2 (diff)
nfsd: add SCSI layout support
This is a simple extension to the block layout driver to use SCSI persistent reservations for access control and fencing, as well as SCSI VPD pages for device identification. For this we need to pass the nfs4_client to the proc_getdeviceinfo method to generate the reservation key, and add a new fence_client method to allow for fence actions in the layout driver. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/nfs4layouts.c')
-rw-r--r--fs/nfsd/nfs4layouts.c27
1 files changed, 24 insertions, 3 deletions
diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
index 4e4def77ebc7..825c7bc8d789 100644
--- a/fs/nfsd/nfs4layouts.c
+++ b/fs/nfsd/nfs4layouts.c
@@ -1,6 +1,7 @@
/*
* Copyright (c) 2014 Christoph Hellwig.
*/
+#include <linux/blkdev.h>
#include <linux/kmod.h>
#include <linux/file.h>
#include <linux/jhash.h>
@@ -29,6 +30,9 @@ const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = {
#ifdef CONFIG_NFSD_BLOCKLAYOUT
[LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,
#endif
+#ifdef CONFIG_NFSD_SCSILAYOUT
+ [LAYOUT_SCSI] = &scsi_layout_ops,
+#endif
};
/* pNFS device ID to export fsid mapping */
@@ -123,12 +127,24 @@ void nfsd4_setup_layout_type(struct svc_export *exp)
if (!(exp->ex_flags & NFSEXP_PNFS))
return;
+ /*
+ * Check if the file system supports exporting a block-like layout.
+ * If the block device supports reservations prefer the SCSI layout,
+ * otherwise advertise the block layout.
+ */
#ifdef CONFIG_NFSD_BLOCKLAYOUT
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;
#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;
+#endif
}
static void
@@ -594,8 +610,6 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
- trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
-
printk(KERN_WARNING
"nfsd: client %s failed to respond to layout recall. "
" Fencing..\n", addr_str);
@@ -630,6 +644,7 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
container_of(cb, struct nfs4_layout_stateid, ls_recall);
struct nfsd_net *nn;
ktime_t now, cutoff;
+ const struct nfsd4_layout_ops *ops;
LIST_HEAD(reaplist);
@@ -665,7 +680,13 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
/*
* Unknown error or non-responding client, we'll need to fence.
*/
- nfsd4_cb_layout_fail(ls);
+ trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
+
+ ops = nfsd4_layout_ops[ls->ls_layout_type];
+ if (ops->fence_client)
+ ops->fence_client(ls);
+ else
+ nfsd4_cb_layout_fail(ls);
return -1;
}
}