From: Jan Kara <jack@suse.cz>
Date: Tue, 3 May 2011 15:12:58 +0000 (-0400)
Subject: ext4: fix deadlock in ext4_symlink() in ENOSPC conditions
X-Git-Tag: v3.0-rc1~140^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df5e6223407e3e645065c4bd968fee007f0e0287;p=pandora-kernel.git

ext4: fix deadlock in ext4_symlink() in ENOSPC conditions

ext4_symlink() cannot call __page_symlink() with transaction open.
__page_symlink() calls ext4_write_begin() which can wait for
transaction commit if we are running out of space thus causing a
deadlock. Also error recovery in ext4_truncate_failed_write() does not
count with the transaction being already started (although I'm not
aware of any particular deadlock here).

Fix the problem by stopping a transaction before calling
__page_symlink() (we have to be careful and put inode to orphan list
so that it gets deleted in case of crash) and starting another one
after __page_symlink() returns for addition of symlink into a
directory.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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