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authorFred Isaman <iisaman@netapp.com>2011-01-06 11:36:32 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-01-06 14:46:32 -0500
commitf7e8917a67980924651a9e244510e63ef05c7755 (patch)
treefb00db5ef8b3b26793fae7a1186f1cd16205ab9d /fs/nfs/pnfs.h
parent36840370845629e6cb4324d1dd4aff6778670503 (diff)
downloadop-kernel-dev-f7e8917a67980924651a9e244510e63ef05c7755.zip
op-kernel-dev-f7e8917a67980924651a9e244510e63ef05c7755.tar.gz
pnfs: layout roc code
A layout can request return-on-close. How this interacts with the forgetful model of never sending LAYOUTRETURNS is a bit ambiguous. We forget any layouts marked roc, and wait for them to be completely forgotten before continuing with the close. In addition, to compensate for races with any inflight LAYOUTGETs, and the fact that we do not get any layout stateid back from the server, we set the barrier to the worst case scenario of current_seqid + number of outstanding LAYOUTGETS. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/pnfs.h')
-rw-r--r--fs/nfs/pnfs.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index f91d0d4..e2612ea 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -32,6 +32,7 @@
enum {
NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
+ NFS_LSEG_ROC, /* roc bit received from server */
};
struct pnfs_layout_segment {
@@ -50,6 +51,7 @@ enum {
NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
+ NFS_LAYOUT_ROC, /* some lseg had roc bit set */
NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
};
@@ -72,6 +74,7 @@ struct pnfs_layout_hdr {
struct list_head plh_segs; /* layout segments list */
nfs4_stateid plh_stateid;
atomic_t plh_outstanding; /* number of RPCs out */
+ unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
u32 plh_barrier; /* ignore lower seqids */
unsigned long plh_flags;
struct inode *plh_inode;
@@ -162,6 +165,10 @@ int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
struct list_head *tmp_list,
u32 iomode);
+bool pnfs_roc(struct inode *ino);
+void pnfs_roc_release(struct inode *ino);
+void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
+bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
static inline int lo_fail_bit(u32 iomode)
@@ -193,6 +200,28 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
return NULL;
}
+static inline bool
+pnfs_roc(struct inode *ino)
+{
+ return false;
+}
+
+static inline void
+pnfs_roc_release(struct inode *ino)
+{
+}
+
+static inline void
+pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
+{
+}
+
+static inline bool
+pnfs_roc_drain(struct inode *ino, u32 *barrier)
+{
+ return false;
+}
+
static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
{
}
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