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| author | Paul Mundt <lethal@linux-sh.org> | 2009-12-24 15:16:02 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-12-24 15:16:02 +0900 |
| commit | f34548cb735b7a80bbbb0bdd09ad4c2173ba92d5 (patch) | |
| tree | e53c9e39b3149221779c10595bc59fa02de4f45f /mm/readahead.c | |
| parent | 76382b5bdb77c29ab430e1b82ef1c604c8dd113b (diff) | |
| parent | 32b53076c31ce9159740b744d5eb5d9505312add (diff) | |
| download | kernel-crypto-f34548cb735b7a80bbbb0bdd09ad4c2173ba92d5.tar.gz kernel-crypto-f34548cb735b7a80bbbb0bdd09ad4c2173ba92d5.tar.xz kernel-crypto-f34548cb735b7a80bbbb0bdd09ad4c2173ba92d5.zip | |
Merge branch 'sh/g3-prep' into sh/for-2.6.33
Diffstat (limited to 'mm/readahead.c')
| -rw-r--r-- | mm/readahead.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/readahead.c b/mm/readahead.c index aa1aa234523..033bc135a41 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -547,5 +547,17 @@ page_cache_async_readahead(struct address_space *mapping, /* do read-ahead */ ondemand_readahead(mapping, ra, filp, true, offset, req_size); + +#ifdef CONFIG_BLOCK + /* + * Normally the current page is !uptodate and lock_page() will be + * immediately called to implicitly unplug the device. However this + * is not always true for RAID conifgurations, where data arrives + * not strictly in their submission order. In this case we need to + * explicitly kick off the IO. + */ + if (PageUptodate(page)) + blk_run_backing_dev(mapping->backing_dev_info, NULL); +#endif } EXPORT_SYMBOL_GPL(page_cache_async_readahead); |