NFSv4.1: Add helpers for setting/reading the I/O fail bit

...and make them local to the pnfs.c file.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 26 insertions, 18 deletions

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index df45acaf91f..f46f9bc4f76 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -238,6 +238,27 @@ pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
         }
 }
 
+static int
+pnfs_iomode_to_fail_bit(u32 iomode)
+{
+        return iomode == IOMODE_RW ?
+                NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
+}
+
+static void
+pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
+{
+        set_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags);
+        dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
+                        iomode == IOMODE_RW ?  "RW" : "READ");
+}
+
+static bool
+pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
+{
+        return test_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags) != 0;
+}
+
 static void
 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
 {
@@ -612,7 +633,7 @@ send_layoutget(struct pnfs_layout_hdr *lo,
                         break;
                 default:
                         /* remember that LAYOUTGET failed and suspend trying */
-                        set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
+                        pnfs_layout_io_set_failed(lo, range->iomode);
                 }
                 return NULL;
         }
@@ -669,8 +690,8 @@ _pnfs_return_layout(struct inode *ino)
         lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
         if (unlikely(lrp == NULL)) {
                 status = -ENOMEM;
-                set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
-                set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
+                pnfs_layout_io_set_failed(lo, IOMODE_RW);
+                pnfs_layout_io_set_failed(lo, IOMODE_READ);
                 pnfs_clear_layout_returned(lo);
                 pnfs_put_layout_hdr(lo);
                 goto out;
@@ -1019,7 +1040,6 @@ pnfs_update_layout(struct inode *ino,
                 .length = count,
         };
         unsigned pg_offset;
-        struct nfs_inode *nfsi = NFS_I(ino);
         struct nfs_server *server = NFS_SERVER(ino);
         struct nfs_client *clp = server->nfs_client;
         struct pnfs_layout_hdr *lo;
@@ -1044,7 +1064,7 @@ pnfs_update_layout(struct inode *ino,
         }
 
         /* if LAYOUTGET already failed once we don't try again */
-        if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
+        if (pnfs_layout_io_test_failed(lo, iomode))
                 goto out_unlock;
 
         /* Check to see if the layout for the given range already exists */
@@ -1585,13 +1605,7 @@ static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
 
 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
 {
-        if (lseg->pls_range.iomode == IOMODE_RW) {
-                dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
-                set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
-        } else {
-                dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
-                set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
-        }
+        pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
 }
 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
 
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 04958797fad..e3eb7d1b17a 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -274,12 +274,6 @@ pnfs_test_layout_returned(struct pnfs_layout_hdr *lo)
         return test_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
 }
 
-static inline int lo_fail_bit(u32 iomode)
-{
-        return iomode == IOMODE_RW ?
-                         NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
-}
-
 static inline struct pnfs_layout_segment *
 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 {