A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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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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3
fs/freevxfs/vxfs_subr.c
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@ -74,10 +74,7 @@ vxfs_get_page(struct address_space *mapping, u_long n)
pp = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(pp)) {
wait_on_page_locked(pp);
kmap(pp);
if (!PageUptodate(pp))
goto fail;
/** if (!PageChecked(pp)) **/
/** vxfs_check_page(pp); **/
if (PageError(pp))