linux-ext4 - [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

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Message-Id: <200910271000.n9RA0emQ021250@demeter.kernel.org>
Date:	Tue, 27 Oct 2009 10:00:40 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

http://bugzilla.kernel.org/show_bug.cgi?id=14354





--- Comment #123 from Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>  2009-10-27 10:00:39 ---
Can you try this patch ?

commit a8836b1d6f92273e001012c7705ae8f4c3d5fb65
Author: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Date:   Tue Oct 27 15:36:38 2009 +0530

    ext4: discard preallocation during truncate

    We need to make sure when we drop and reacquire the inode's
    i_data_sem we discard the inode preallocation. Otherwise we
    could have blocks marked as free in bitmap but still belonging
    to prealloc space.

    Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5c5bc5d..a1ef1c3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -209,6 +209,12 @@ static int try_to_extend_transaction(handle_t *handle,
struct inode *inode)
     up_write(&EXT4_I(inode)->i_data_sem);
     ret = ext4_journal_restart(handle, blocks_for_truncate(inode));
     down_write(&EXT4_I(inode)->i_data_sem);
+    /*
+     * We have dropped i_data_sem. So somebody else could have done
+     * block allocation. So discard the prealloc space created as a
+     * part of block allocation
+     */
+    ext4_discard_preallocations(inode);

     return ret;
 }

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