From: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Date: Tue, 7 Feb 2012 08:58:51 +0000 (+0200)
Subject: UBIFS: do not use inc_link when i_nlink is zero
X-Git-Tag: sz_release~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b14fd42d80107c887ce064a9aa0b8da89571f8df;p=pandora-kernel.git

UBIFS: do not use inc_link when i_nlink is zero

This patch changes the 'i_nlink' counter handling in 'ubifs_unlink()',
'ubifs_rmdir()' and 'ubifs_rename()'. In these function  'i_nlink' may become 0,
and if 'ubifs_jnl_update()' failed, we would use 'inc_nlink()' to restore
the previous 'i_nlink' value, which is incorrect from the VFS point of view and
would cause a 'WARN_ON()' (see 'inc_nlink() implementation).

This patches saves the previous 'i_nlink' value in a local variable and uses it
at the error path instead of calling 'inc_nlink()'. We do this only for the
inodes where 'i_nlink' may potentially become zero.

This change has been requested by Al Viro <viro@ZenIV.linux.org.uk>.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
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