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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-06-26 20:51:32 +0200
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-06-26 20:51:32 +0200
commitc0f5f5059f6c9c9efb6ca688f4d6a800c11f6b58 (patch)
treea5a4556f91e52c95540cc7cb6f3eb3088265cd99 /fs/nfs
parentMerge branch 'layoutstats' (diff)
downloadlinux-c0f5f5059f6c9c9efb6ca688f4d6a800c11f6b58.tar.xz
linux-c0f5f5059f6c9c9efb6ca688f4d6a800c11f6b58.zip
pNFS/flexfiles: Turn off layoutcommit for servers that don't need it
This patch ensures that we record the value of 'ffl_flags' from the layout, and then checks for the presence of the FF_FLAGS_NO_LAYOUTCOMMIT flag before deciding whether or not to call pnfs_set_layoutcommit(). The effect is that servers now can decide whether or not they want the client to call layoutcommit before returning a writeable layout. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c16
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.h3
2 files changed, 18 insertions, 1 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 85b4234b8090..594ab35eacfb 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -343,6 +343,10 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
fls->mirror_array[i]->gid);
}
+ p = xdr_inline_decode(&stream, 4);
+ if (p)
+ fls->flags = be32_to_cpup(p);
+
ff_layout_sort_mirrors(fls);
rc = ff_layout_check_layout(lgr);
if (rc)
@@ -1018,6 +1022,12 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
return 0;
}
+static bool
+ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
+{
+ return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
+}
+
/*
* We reference the rpc_cred of the first WRITE that triggers the need for
* a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
@@ -1030,6 +1040,9 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
static void
ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
{
+ if (!ff_layout_need_layoutcommit(hdr->lseg))
+ return;
+
pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
hdr->mds_offset + hdr->res.count);
dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
@@ -1221,7 +1234,8 @@ static int ff_layout_commit_done_cb(struct rpc_task *task,
return -EAGAIN;
}
- if (data->verf.committed == NFS_UNSTABLE)
+ if (data->verf.committed == NFS_UNSTABLE
+ && ff_layout_need_layoutcommit(data->lseg))
pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
return 0;
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
index 6fcd8d5e8e3d..f92f9a0a856b 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.h
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -9,6 +9,8 @@
#ifndef FS_NFS_NFS4FLEXFILELAYOUT_H
#define FS_NFS_NFS4FLEXFILELAYOUT_H
+#define FF_FLAGS_NO_LAYOUTCOMMIT 1
+
#include "../pnfs.h"
/* XXX: Let's filter out insanely large mirror count for now to avoid oom
@@ -85,6 +87,7 @@ struct nfs4_ff_layout_mirror {
struct nfs4_ff_layout_segment {
struct pnfs_layout_segment generic_hdr;
u64 stripe_unit;
+ u32 flags;
u32 mirror_array_cnt;
struct nfs4_ff_layout_mirror **mirror_array;
};