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SubjectRe: [PATCH 2/6] Rename __lock_page to lock_page_slow

In order to allow for interruptible and asynchronous versions of
lock_page in conjunction with the wait_on_bit changes, we need to
define low-level lock page routines which take an additional
argument, i.e a wait queue entry and may return non-zero status,
e.g -EINTR, -EIOCBRETRY, -EWOULDBLOCK etc. This patch renames
__lock_page to lock_page_slow, so that __lock_page and
__lock_page_slow can denote the versions which take a wait queue
parameter.

Signed-off-by: Suparna Bhattacharya <suparna@in.ibm.com>

include/linux/pagemap.h | 4 ++--
mm/filemap.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff -puN include/linux/pagemap.h~lock_page_slow include/linux/pagemap.h
--- linux-2.6.9-rc1-mm4/include/linux/pagemap.h~lock_page_slow 2004-09-13 11:46:23.000000000 +0530
+++ linux-2.6.9-rc1-mm4-suparna/include/linux/pagemap.h 2004-09-13 12:01:03.000000000 +0530
@@ -151,14 +151,14 @@ static inline pgoff_t linear_page_index(
return pgoff >> (PAGE_CACHE_SHIFT - PAGE_SHIFT);
}

-extern void FASTCALL(__lock_page(struct page *page));
+extern void FASTCALL(lock_page_slow(struct page *page));
extern void FASTCALL(unlock_page(struct page *page));

static inline void lock_page(struct page *page)
{
might_sleep();
if (TestSetPageLocked(page))
- __lock_page(page);
+ lock_page_slow(page);
}

/*
diff -puN mm/filemap.c~lock_page_slow mm/filemap.c
--- linux-2.6.9-rc1-mm4/mm/filemap.c~lock_page_slow 2004-09-13 11:46:23.000000000 +0530
+++ linux-2.6.9-rc1-mm4-suparna/mm/filemap.c 2004-09-13 12:07:53.000000000 +0530
@@ -438,14 +438,14 @@ EXPORT_SYMBOL(end_page_writeback);
* chances are that on the second loop, the block layer's plug list is empty,
* so sync_page() will then return in state TASK_UNINTERRUPTIBLE.
*/
-void fastcall __lock_page(struct page *page)
+void fastcall lock_page_slow(struct page *page)
{
DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);

__wait_on_bit_lock(page_waitqueue(page), &wait, sync_page,
TASK_UNINTERRUPTIBLE);
}
-EXPORT_SYMBOL(__lock_page);
+EXPORT_SYMBOL(lock_page_slow);

/*
* Note completion of filesystem specific page synchronisation
_
--
Suparna Bhattacharya (suparna@in.ibm.com)
Linux Technology Center
IBM Software Lab, India

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