From: "LIOU Payphone" <lioupayphone@gmail.com>
To: <linux-fsdevel@vger.kernel.org>
Subject: ask for help, a question about ext3_ioctl()
Date: Thu, 25 Oct 2007 10:30:14 +0800 [thread overview]
Message-ID: <001d01c816ae$fe5a23e0$fb0e6ba0$@com> (raw)
hello, everyone.
I am puzzled when reading the function named ext3_ioctl().
In the branch named EXT3_IOC_SETFLAGS, inode->mutex was lock firstly, a handle with 1 journal-blocks was started consequently by calling ext3_journal_start().
i investigated the code of ext3_journal_start(), found that if there were no journal blocks left at it happens the process who call ext3_journal_start would be hung up unless some journal block were released.
i want to confirm whether such a situation would happen : there are no journal blocks left when ext3_journal_start() called and other processes could not release the journal blocks they currently holding for an unkown reason. so, when a process who called ext3_ioctl with command "EXT3_IOC_SETFLAGS" will be hung up even though the inode->i_mutex was of locked. in such a situation, the inode->i_mutex would not be released.
a potential deadlock comes on?
many thanks . :-)
reply other threads:[~2007-10-25 2:30 UTC|newest]
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