rpms/kernel/devel linux-2.6-ext4-inode-alloc-race.patch, NONE, 1.1 kernel.spec, 1.1384, 1.1385
Eric Sandeen
sandeen at fedoraproject.org
Thu Mar 5 05:23:58 UTC 2009
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Author: sandeen
Update of /cvs/pkgs/rpms/kernel/devel
In directory cvs1.fedora.phx.redhat.com:/tmp/cvs-serv17165
Modified Files:
kernel.spec
Added Files:
linux-2.6-ext4-inode-alloc-race.patch
Log Message:
* Thu Mar 05 2009 Eric Sandeen <sandeen at redhat.com>
- Fix ext4 race between inode bitmap set/clear
linux-2.6-ext4-inode-alloc-race.patch:
--- NEW FILE linux-2.6-ext4-inode-alloc-race.patch ---
Date: Tue, 03 Mar 2009 22:38:41 -0600
From: Eric Sandeen <sandeen at redhat.com>
To: ext4 development <linux-ext4 at vger.kernel.org>
CC: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
Subject: [PATCH] fix ext4_free_inode vs. ext4_claim_inode race
I was seeing fsck errors on inode bitmaps after a 4 thread
dbench run on a 4 cpu machine:
Inode bitmap differences: -50736 -(50752--50753) etc...
I believe that this is because ext4_free_inode() uses atomic
bitops, and although ext4_new_inode() *used* to also use atomic
bitops for synchronization, commit
393418676a7602e1d7d3f6e560159c65c8cbd50e changed this to use
the sb_bgl_lock, so that we could also synchronize against
read_inode_bitmap and initialization of uninit inode tables.
However, that change left ext4_free_inode using atomic bitops,
which I think leaves no synchronization between setting &
unsetting bits in the inode table.
The below patch fixes it for me, although I wonder if we're
getting at all heavy-handed with this spinlock...
Signed-off-by: Eric Sandeen <sandeen at redhat.com>
---
Index: linux-2.6/fs/ext4/ialloc.c
===================================================================
--- linux-2.6.orig/fs/ext4/ialloc.c
+++ linux-2.6/fs/ext4/ialloc.c
@@ -188,7 +188,7 @@ void ext4_free_inode(handle_t *handle, s
struct ext4_group_desc *gdp;
struct ext4_super_block *es;
struct ext4_sb_info *sbi;
- int fatal = 0, err, count;
+ int fatal = 0, err, count, cleared;
ext4_group_t flex_group;
if (atomic_read(&inode->i_count) > 1) {
@@ -248,8 +248,10 @@ void ext4_free_inode(handle_t *handle, s
goto error_return;
/* Ok, now we can actually update the inode bitmaps.. */
- if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
- bit, bitmap_bh->b_data))
+ spin_lock(sb_bgl_lock(sbi, block_group));
+ cleared = ext4_clear_bit(bit, bitmap_bh->b_data);
+ spin_unlock(sb_bgl_lock(sbi, block_group));
+ if (!cleared)
ext4_error(sb, "ext4_free_inode",
"bit already cleared for inode %lu", ino);
else {
Index: kernel.spec
===================================================================
RCS file: /cvs/pkgs/rpms/kernel/devel/kernel.spec,v
retrieving revision 1.1384
retrieving revision 1.1385
diff -u -r1.1384 -r1.1385
--- kernel.spec 5 Mar 2009 00:27:56 -0000 1.1384
+++ kernel.spec 5 Mar 2009 05:23:27 -0000 1.1385
@@ -674,6 +674,9 @@
Patch2899: linux-2.6-v4l-dvb-fixes.patch
Patch2900: linux-2.6-v4l-dvb-update.patch
+# ext4 fixes
+Patch2910: linux-2.6-ext4-inode-alloc-race.patch
+
Patch9001: revert-fix-modules_install-via-nfs.patch
%endif
@@ -1086,6 +1089,7 @@
#
# ext4
+ApplyPatch linux-2.6-ext4-inode-alloc-race.patch
# xfs
@@ -1792,6 +1796,9 @@
# and build.
%changelog
+* Thu Mar 05 2009 Eric Sandeen <sandeen at redhat.com>
+- Fix ext4 race between inode bitmap set/clear
+
* Thu Mar 05 2009 Ben Skeggs <bskeggs at redhat.com>
- drm-nouveau.patch: fix <nv50 chipsets, and ppc.
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