LU-9340 lov: readahead shouldn't exceed component boundary

[fs/lustre-release.git] / lustre / lov / lov_io.c

diff --git a/lustre/lov/lov_io.c b/lustre/lov/lov_io.c
index 1bf1bcb..d1370b9 100644 (file)
--- a/lustre/lov/lov_io.c
+++ b/lustre/lov/lov_io.c
@@ -702,28 +702,36 @@ static int lov_io_read_ahead(const struct lu_env *env,
                RETURN(rc);
 
        /**
-        * Adjust the stripe index by layout of raid0. ra->cra_end is the
+        * Adjust the stripe index by layout of comp. ra->cra_end is the
         * maximum page index covered by an underlying DLM lock.
         * This function converts cra_end from stripe level to file level, and
-        * make sure it's not beyond stripe boundary.
+        * make sure it's not beyond stripe and component boundary.
         */
-       if (r0->lo_nr == 1) /* single stripe file */
-               RETURN(0);
 
        /* cra_end is stripe level, convert it into file level */
        ra_end = ra->cra_end;
        if (ra_end != CL_PAGE_EOF)
-               ra_end = lov_stripe_pgoff(loo->lo_lsm, index, ra_end, stripe);
+               ra->cra_end = lov_stripe_pgoff(loo->lo_lsm, index,
+                                              ra_end, stripe);
+
+       /* boundary of current component */
+       ra_end = cl_index(obj, (loff_t)lov_lse(loo, index)->lsme_extent.e_end);
+       if (ra_end != CL_PAGE_EOF && ra->cra_end >= ra_end)
+               ra->cra_end = ra_end - 1;
+
+       if (r0->lo_nr == 1) /* single stripe file */
+               RETURN(0);
 
        pps = lov_lse(loo, index)->lsme_stripe_size >> PAGE_SHIFT;
 
        CDEBUG(D_READA, DFID " max_index = %lu, pps = %u, index = %u, "
               "stripe_size = %u, stripe no = %u, start index = %lu\n",
-              PFID(lu_object_fid(lov2lu(loo))), ra_end, pps, index,
+              PFID(lu_object_fid(lov2lu(loo))), ra->cra_end, pps, index,
               lov_lse(loo, index)->lsme_stripe_size, stripe, start);
 
        /* never exceed the end of the stripe */
-       ra->cra_end = min_t(pgoff_t, ra_end, start + pps - start % pps - 1);
+       ra->cra_end = min_t(pgoff_t,
+                           ra->cra_end, start + pps - start % pps - 1);
        RETURN(0);
 }