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 <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
---
linux-2.6.20-rc1-root/include/linux/pagemap.h | 4 ++--
linux-2.6.20-rc1-root/mm/filemap.c | 8 ++++----
2 files changed, 6 insertions(+), 6 deletions(-)
diff -puN include/linux/pagemap.h~lock_page_slow include/linux/pagemap.h
--- linux-2.6.20-rc1/include/linux/pagemap.h~lock_page_slow 2006-12-21 08:45:40.000000000 +0530
+++ linux-2.6.20-rc1-root/include/linux/pagemap.h 2006-12-28 09:32:39.000000000 +0530
@@ -133,7 +133,7 @@ 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(__lock_page_nosync(struct page *page));
extern void FASTCALL(unlock_page(struct page *page));
@@ -144,7 +144,7 @@ static inline void lock_page(struct 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-2.6.20-rc1/mm/filemap.c~lock_page_slow 2006-12-21 08:45:40.000000000 +0530
+++ linux-2.6.20-rc1-root/mm/filemap.c 2006-12-28 09:32:39.000000000 +0530
@@ -556,7 +556,7 @@ void end_page_writeback(struct page *pag
EXPORT_SYMBOL(end_page_writeback);
/**
- * __lock_page - get a lock on the page, assuming we need to sleep to get it
+ * lock_page_slow - get a lock on the page, assuming we need to sleep to get it
* @page: the page to lock
*
* Ugly. Running sync_page() in state TASK_UNINTERRUPTIBLE is scary. If some
@@ -564,14 +564,14 @@ 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);
/*
* Variant of lock_page that does not require the caller to hold a reference
@@ -647,7 +647,7 @@ repeat:
page_cache_get(page);
if (TestSetPageLocked(page)) {
read_unlock_irq(&mapping->tree_lock);
- __lock_page(page);
+ lock_page_slow(page);
read_lock_irq(&mapping->tree_lock);
/* Has the page been truncated while we slept? */
_
--
Suparna Bhattacharya ([email protected])
Linux Technology Center
IBM Software Lab, India
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