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[PATCH] set_page_dirty() return value fixes

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We need set_page_dirty() to return true if it actually transitioned the page
from a clean to dirty state.  This wasn't right in a couple of places.  Do a
kernel-wide audit, fix things up.

This leaves open the possibility of returning a negative errno from
set_page_dirty() sometime in the future.  But we don't do that at present.

Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton 2006-03-24 03:18:11 -08:00 • committed by Linus Torvalds
commit 4741c9fd36
5 changed files with 11 additions and 9 deletions
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11
mm/page-writeback.c
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@ -628,8 +628,6 @@ EXPORT_SYMBOL(write_one_page);
*/
int __set_page_dirty_nobuffers(struct page *page)
{
int ret = 0;
if (!TestSetPageDirty(page)) {
struct address_space *mapping = page_mapping(page);
struct address_space *mapping2;
@ -651,8 +649,9 @@ int __set_page_dirty_nobuffers(struct page *page)
I_DIRTY_PAGES);
}
}
return 1;
}
return ret;
return 0;
}
EXPORT_SYMBOL(__set_page_dirty_nobuffers);
@ -682,8 +681,10 @@ int fastcall set_page_dirty(struct page *page)
return (*spd)(page);
return __set_page_dirty_buffers(page);
}
if (!PageDirty(page))
SetPageDirty(page);
if (!PageDirty(page)) {
if (!TestSetPageDirty(page))
return 1;
}
return 0;
}
EXPORT_SYMBOL(set_page_dirty);