pnfs: set NFS_IOHDR_REDO in pnfs_read_resend_pnfs

Like other resend paths, mark the (old) hdr as NFS_IOHDR_REDO. This
ensures the hdr completion function will not count the (old) hdr
as good bytes.

Also, vector the error back through the hdr->task.tk_status like other
retry calls.

This fixes a bug with the FlexFiles layout where libaio was reporting more
bytes read than requested.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 89a5ef4..5b404d9 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2143,12 +2143,15 @@ pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
 }
 
 /* Resend all requests through pnfs. */
-int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
+void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
 {
        struct nfs_pageio_descriptor pgio;
 
-       nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
-       return nfs_pageio_resend(&pgio, hdr);
+       if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
+               nfs_pageio_init_read(&pgio, hdr->inode, false,
+                                       hdr->completion_ops);
+               hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
+       }
 }
 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
 
@@ -2158,12 +2161,11 @@ pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
        const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
        struct pnfs_layout_segment *lseg = desc->pg_lseg;
        enum pnfs_try_status trypnfs;
-       int err = 0;
 
        trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
        if (trypnfs == PNFS_TRY_AGAIN)
-               err = pnfs_read_resend_pnfs(hdr);
-       if (trypnfs == PNFS_NOT_ATTEMPTED || err)
+               pnfs_read_resend_pnfs(hdr);
+       if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
                pnfs_read_through_mds(desc, hdr);
 }
 

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 1ac1db5..7222d3a 100644 (file)
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -282,7 +282,7 @@ int _pnfs_return_layout(struct inode *);
 int pnfs_commit_and_return_layout(struct inode *);
 void pnfs_ld_write_done(struct nfs_pgio_header *);
 void pnfs_ld_read_done(struct nfs_pgio_header *);
-int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
+void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
                                               struct nfs_open_context *ctx,
                                               loff_t pos,