It tries to find the lseg from local cache but not retrive layout from server.
Signed-off-by: Peng Tao <peng_tao@xxxxxxx>
---
fs/nfs/pnfs.c | 25 +++++++++++++++++++++++++
fs/nfs/pnfs.h | 5 +++++
2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 3be29c7..734e670 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -933,6 +933,31 @@ pnfs_find_lseg(struct pnfs_layout_hdr *lo,
}
/*
+ * Find and reference lseg with ino->i_lock held.
+ */
+struct pnfs_layout_segment *
+pnfs_find_get_layout_locked(struct inode *ino,
+ loff_t pos,
+ u64 count,
+ enum pnfs_iomode iomode)
+{
+ struct pnfs_layout_segment *lseg = NULL;
+ struct pnfs_layout_range range = {
+ .iomode = iomode,
+ .offset = pos,
+ .length = count,
+ };
+
+ if (NFS_I(ino)->layout == NULL)
+ goto out;
+
+ lseg = pnfs_find_lseg(NFS_I(ino)->layout, &range);
+out:
+ return lseg;
+}
+EXPORT_SYMBOL_GPL(pnfs_find_get_layout_locked);
+
+/*
* Layout segment is retreived from the server if not cached.
* The appropriate layout segment is referenced and returned to the caller.
*/
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 9614ac9..0c55fc1 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -213,6 +213,11 @@ struct pnfs_layout_hdr *
pnfs_find_alloc_layout(struct inode *ino,
struct nfs_open_context *ctx,
gfp_t gfp_flags);
+struct pnfs_layout_segment *
+pnfs_find_get_layout_locked(struct inode *ino,
+ loff_t pos,
+ u64 count,
+ enum pnfs_iomode iomode);
void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
--
1.7.1.262.g5ef3d
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