From c5a77bc13d82121bfa726f10e0384ff4c02c3f82 Mon Sep 17 00:00:00 2001
From: wangdi <wangdi>
Date: Fri, 5 Sep 2008 08:02:58 +0000
Subject: [PATCH] Branch:HEAD b=16717 fix lbug when conf log is full
 i=nathan,umka

---
 lustre/ChangeLog            |  6 ++++++
 lustre/obdclass/llog_lvfs.c | 23 +++++++++++++----------
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/lustre/ChangeLog b/lustre/ChangeLog
index 78b092c..7be55df 100644
--- a/lustre/ChangeLog
+++ b/lustre/ChangeLog
@@ -12,6 +12,12 @@ tbd  Sun Microsystems, Inc.
        * RHEL 4 and RHEL 5/SLES 10 clients behaves differently on 'cd' to a
         removed cwd "./" (refer to Bugzilla 14399).
 
+Severity   : minor 
+Bugzilla   : 16717 
+Description: LBUG when llog conf file is full 
+Details    : When llog bitmap is full, ENOSPC should be returned for plain
+             log.
+
 Severity   : normal
 Bugzilla   : 16907
 Description: Prevent import from entering FULL state when server in recovery
diff --git a/lustre/obdclass/llog_lvfs.c b/lustre/obdclass/llog_lvfs.c
index 0dbfd5c..4f3c913 100644
--- a/lustre/obdclass/llog_lvfs.c
+++ b/lustre/obdclass/llog_lvfs.c
@@ -324,15 +324,15 @@ static int llog_lvfs_write_rec(struct llog_handle *loghandle,
         /* NOTE: padding is a record, but no bit is set */
         if (left != 0 && left != reclen &&
             left < (reclen + LLOG_MIN_REC_SIZE)) {
-                loghandle->lgh_last_idx++;
-                rc = llog_lvfs_pad(obd, file, left, loghandle->lgh_last_idx);
-                if (rc)
-                        RETURN(rc);
-                /* if it's the last idx in log file, then return -ENOSPC */
-                if (loghandle->lgh_last_idx == LLOG_BITMAP_SIZE(llh) - 1)
-                        RETURN(-ENOSPC);
-        }
-
+                 index = loghandle->lgh_last_idx + 1;
+                 rc = llog_lvfs_pad(obd, file, left, index);
+                 if (rc)
+                         RETURN(rc);
+                 loghandle->lgh_last_idx++; /*for pad rec*/
+         }
+         /* if it's the last idx in log file, then return -ENOSPC */
+         if (loghandle->lgh_last_idx >= LLOG_BITMAP_SIZE(llh) - 1)
+                 RETURN(-ENOSPC);
         loghandle->lgh_last_idx++;
         index = loghandle->lgh_last_idx;
         LASSERT(index < LLOG_BITMAP_SIZE(llh));
@@ -343,6 +343,9 @@ static int llog_lvfs_write_rec(struct llog_handle *loghandle,
                 lrt->lrt_len = rec->lrh_len;
                 lrt->lrt_index = rec->lrh_index;
         }
+        /*The caller should make sure only 1 process access the lgh_last_idx,
+         *Otherwise it might hit the assert.*/
+        LASSERT(index < LLOG_BITMAP_SIZE(llh));
         if (ext2_set_bit(index, llh->llh_bitmap)) {
                 CERROR("argh, index %u already set in log bitmap?\n", index);
                 LBUG(); /* should never happen */
@@ -358,7 +361,7 @@ static int llog_lvfs_write_rec(struct llog_handle *loghandle,
         if (rc)
                 RETURN(rc);
 
-        CDEBUG(D_RPCTRACE, "added record "LPX64": idx: %u, %u bytes\n",
+        CDEBUG(D_RPCTRACE, "added record "LPX64": idx: %u, %u \n",
                loghandle->lgh_id.lgl_oid, index, rec->lrh_len);
         if (rc == 0 && reccookie) {
                 reccookie->lgc_lgl = loghandle->lgh_id;
-- 
1.8.3.1