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authorNick Piggin <npiggin@suse.de>2007-05-06 23:49:04 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 21:12:51 +0200
commit6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2 (patch)
tree8bbfe5072279227cc50a941ad4813908082426a1 /mm/swapfile.c
parentslab: ensure cache_alloc_refill terminates (diff)
downloadlinux-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.xz
linux-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.zip
mm: make read_cache_page synchronous
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 <npiggin@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index a2d9bb4e80df..acc172cbe3aa 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1531,9 +1531,6 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
error = PTR_ERR(page);
goto bad_swap;
}
- wait_on_page_locked(page);
- if (!PageUptodate(page))
- goto bad_swap;
kmap(page);
swap_header = page_address(page);