linux-ext4 - [Bug 15768] New: Incorrectly calculated free blocks result in ENOSPC from writepage

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Message-ID: <bug-15768-13602@https.bugzilla.kernel.org/>
Date:	Mon, 12 Apr 2010 11:26:24 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15768] New: Incorrectly calculated free blocks result in ENOSPC
 from writepage

https://bugzilla.kernel.org/show_bug.cgi?id=15768

           Summary: Incorrectly calculated free blocks result in ENOSPC
                    from writepage
           Product: File System
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: dmonakhov@...nvz.org
                CC: tytso@....edu
        Regression: No

Created an attachment (id=25965)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=25965)
testcase

No mount per-sb counters (freeblocks/freeinodes/dir and etc) are initialized 
before journal was replayed.
But in fact if journal wasn't empty statistics will be probably changed after
journal replay. This result in per-sb counter  inconsistency which result in
incorrect delalloc reservation. See testcase.
This is long standing bug at least from 2.6.12 where the linus's tree starts i
(was too lazy to dig in to old-git tree).
But it case of ext3 this result only in incorrect numbers from statfs()
The fix is simple, we just have to move counter initialisation after
journal_reply.
I've open this bug only as testcase storage.

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