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authorWu Fengguang <fengguang.wu@intel.com>2008-12-23 15:21:30 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-12-23 15:21:30 -0500
commit136221fc3219b3805c48db5da065e8e3467175d4 (patch)
tree62fa68f46cb765143b6159993eceb30a6b81f9b2 /net
parent3d44cc3e01ee1b40317f79ed54324e25c4f848df (diff)
nfs: remove redundant tests on reading new pages
aops->readpages() and its NFS helper readpage_async_filler() will only be called to do readahead I/O for newly allocated pages. So it's not necessary to test for the always 0 dirty/uptodate page flags. The removal of nfs_wb_page() call also fixes a readahead bug: the NFS readahead has been synchronous since 2.6.23, because that call will clear PG_readahead, which is the reminder for asynchronous readahead. More background: the PG_readahead page flag is shared with PG_reclaim, one for read path and the other for write path. clear_page_dirty_for_io() unconditionally clears PG_readahead to prevent possible readahead residuals, assuming itself to be always called in the write path. However, NFS is one and the only exception in that it _always_ calls clear_page_dirty_for_io() in the read path, i.e. for readpages()/readpage(). Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Wu Fengguang <wfg@linux.intel.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions