[DragonFlyBSD - Submit #2469] [PATCH] kernel -- ffs: Soft updates getdirtybuf/flush_pagedep_deps panic fix

[Venkatesh Srinivas via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2469 has been reported by Venkatesh Srinivas.

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Submit #2469: [PATCH] kernel -- ffs: Soft updates getdirtybuf/flush_pagedep_deps panic fix
http://bugs.dragonflybsd.org/issues/2469

Author: Venkatesh Srinivas
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


If getdirtybuf() was unable to lookup a dirty buffer from the
flush_pagedep_deps path, we need to retry the lookup, rather than
proceeding through processing the diradd.

Reported-by: marino@
---
  sys/vfs/ufs/ffs_softdep.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/sys/vfs/ufs/ffs_softdep.c b/sys/vfs/ufs/ffs_softdep.c
index b6a8cbf..d8a91f6 100644
--- a/sys/vfs/ufs/ffs_softdep.c
+++ b/sys/vfs/ufs/ffs_softdep.c
@@ -4593,6 +4593,7 @@ flush_pagedep_deps(struct vnode *pvp, struct mount *mp,
  		 * locate that buffer, ensure that there will be no rollback
  		 * caused by a bitmap dependency, then write the inode buffer.
  		 */
+retry_lookup:
  		if (inodedep_lookup(ump->um_fs, inum, 0, &inodedep) == 0) {
  			panic("flush_pagedep_deps: lost inode");
  		}
@@ -4602,6 +4603,8 @@ flush_pagedep_deps(struct vnode *pvp, struct mount *mp,
  		 */
  		if ((inodedep->id_state & DEPCOMPLETE) == 0) {
  			gotit = getdirtybuf(&inodedep->id_buf, MNT_WAIT);
+			if (gotit == 0)
+				goto retry_lookup;
  			FREE_LOCK(&lk);
  			if (gotit && (error = bwrite(inodedep->id_buf)) != 0)
  				break;
-- 
1.7.12.1.382.gb0576a6


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