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mm: make read_cache_page synchronous

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Ensure pages are uptodate after returning from read_cache_page, which allows
us to cut out most of the filesystem-internal PageUptodate calls.

I didn't have a great look down the call chains, but this appears to fixes 7
possible use-before uptodate in hfs, 2 in hfsplus, 1 in jfs, a few in
ecryptfs, 1 in jffs2, and a possible cleared data overwritten with readpage in
block2mtd.  All depending on whether the filler is async and/or can return
with a !uptodate page.

Signed-off-by: Nick Piggin <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2007-05-06 14:49:04 -07:00 • committed by Linus Torvalds
commit 6fe6900e1e
24 changed files with 71 additions and 146 deletions
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6
drivers/mtd/devices/block2mtd.c
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@ -40,13 +40,11 @@ struct block2mtd_dev {
static LIST_HEAD(blkmtd_device_list);
static struct page* page_read(struct address_space *mapping, int index)
static struct page *page_read(struct address_space *mapping, int index)
{
filler_t *filler = (filler_t*)mapping->a_ops->readpage;
return read_cache_page(mapping, index, filler, NULL);
return read_mapping_page(mapping, index, NULL);
}
/* erase a specified part of the device */
static int _block2mtd_erase(struct block2mtd_dev *dev, loff_t to, size_t len)
{