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authorPeng Tao <tao.peng@primarydata.com>2014-12-01 08:22:18 +0800
committerTom Haynes <loghyr@primarydata.com>2015-02-03 11:06:50 -0800
commitc829013dca33110d57c7f625443b716bd7a17671 (patch)
treef5a1b72ce85f2bb98eb6f14c1f26d8ad6418be0c /fs/nfs/pnfs.h
parent27b6f53987d61822a858b4680c3727bfb19e620a (diff)
downloadtalos-op-linux-c829013dca33110d57c7f625443b716bd7a17671.tar.gz
talos-op-linux-c829013dca33110d57c7f625443b716bd7a17671.zip
nfs41: add NFS_LAYOUT_RETRY_LAYOUTGET to layout header flags
Use it to indicate that LD wants to retry layoutget. LD can set it whenever it wants the common pnfs code to return and retry pnfs path through a new layout. The bit gets cleared when client does a new layoutget, when client closes the file (ROC case), or when kernel needs to evict the inode (non-ROC case). Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.h')
-rw-r--r--fs/nfs/pnfs.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 080bf90498d4..fed6ae067acb 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -99,6 +99,7 @@ enum {
NFS_LAYOUT_RETURN_BEFORE_CLOSE, /* Return this layout before close */
NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
+ NFS_LAYOUT_RETRY_LAYOUTGET, /* Retry layoutget */
};
enum layoutdriver_policy_flags {
@@ -350,6 +351,23 @@ nfs4_get_deviceid(struct nfs4_deviceid_node *d)
return d;
}
+static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo)
+{
+ if (!test_and_set_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
+ atomic_inc(&lo->plh_refcount);
+}
+
+static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo)
+{
+ if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
+ atomic_dec(&lo->plh_refcount);
+}
+
+static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)
+{
+ return test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags);
+}
+
static inline struct pnfs_layout_segment *
pnfs_get_lseg(struct pnfs_layout_segment *lseg)
{
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