From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Date: Thu, 3 Jan 2008 19:09:33 +0000 (-0600)
Subject: JFS: clear PAGECACHE_TAG_DIRTY for no-write pages
X-Git-Tag: v2.6.25-rc1~1238^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=29a424f28390752a4ca2349633aaacc6be494db5;p=pandora-kernel.git

JFS: clear PAGECACHE_TAG_DIRTY for no-write pages

When JFS decides to drop a dirty metapage, it simply clears the META_dirty
bit and leave alone the PG_dirty and PAGECACHE_TAG_DIRTY bits.

When such no-write page goes to metapage_writepage(), the `relic'
PAGECACHE_TAG_DIRTY tag should be cleared, to prevent pdflush from
repeatedly trying to sync them.  This is done through
set_page_writeback(), so call it should be called in all cases.  If
no I/O is initiated, end_page_writeback() should be called immediately.

This is how __block_write_full_page() does things.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
CC: Fengguang Wu <wfg@mail.ustc.edu.cn>
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