The patch titled
mm: introduce probe_page()
has been removed from the -mm tree. Its filename was
mm-introduce-probe_page.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: mm: introduce probe_page()
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Introduce a pair of functions to probe the existence of file page.
- int __probe_page(mapping, offset)
- int probe_page(mapping, offset)
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/pagemap.h | 2 ++
mm/filemap.c | 22 ++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff -puN include/linux/pagemap.h~mm-introduce-probe_page include/linux/pagemap.h
--- a/include/linux/pagemap.h~mm-introduce-probe_page
+++ a/include/linux/pagemap.h
@@ -72,6 +72,8 @@ static inline struct page *page_cache_al
typedef int filler_t(void *, struct page *);
+extern int __probe_page(struct address_space *mapping, pgoff_t offset);
+extern int probe_page(struct address_space *mapping, pgoff_t offset);
extern struct page * find_get_page(struct address_space *mapping,
unsigned long index);
extern struct page * find_lock_page(struct address_space *mapping,
diff -puN mm/filemap.c~mm-introduce-probe_page mm/filemap.c
--- a/mm/filemap.c~mm-introduce-probe_page
+++ a/mm/filemap.c
@@ -552,6 +552,28 @@ void fastcall unlock_page(struct page *p
}
EXPORT_SYMBOL(unlock_page);
+/*
+ * Probing page existence.
+ */
+int __probe_page(struct address_space *mapping, pgoff_t offset)
+{
+ return !! radix_tree_lookup(&mapping->page_tree, offset);
+}
+
+/*
+ * Here we just do not bother to grab the page, it's meaningless anyway.
+ */
+int probe_page(struct address_space *mapping, pgoff_t offset)
+{
+ int exists;
+
+ read_lock_irq(&mapping->tree_lock);
+ exists = __probe_page(mapping, offset);
+ read_unlock_irq(&mapping->tree_lock);
+
+ return exists;
+}
+
/**
* end_page_writeback - end writeback against a page
* @page: the page
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
mm-introduce-probe_page.patch
mm-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.patch
readahead-delay-page-release-in-do_generic_mapping_read.patch
readahead-insert-cond_resched-calls.patch
readahead-minmax_ra_pages.patch
readahead-events-accounting.patch
readahead-rescue_pages.patch
readahead-sysctl-parameters.patch
readahead-min-max-sizes.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-routines.patch
readahead-state-based-method.patch
readahead-context-based-method.patch
readahead-initial-method-guiding-sizes.patch
readahead-initial-method-thrashing-guard-size.patch
readahead-initial-method-expected-read-size.patch
readahead-initial-method-user-recommended-size.patch
readahead-initial-method.patch
readahead-backward-prefetching-method.patch
readahead-seeking-reads-method.patch
readahead-thrashing-recovery-method.patch
readahead-call-scheme.patch
readahead-laptop-mode.patch
readahead-loop-case.patch
readahead-nfsd-case.patch
readahead-turn-on-by-default.patch
readahead-debug-radix-tree-new-functions.patch
readahead-debug-traces-showing-accessed-file-names.patch
readahead-debug-traces-showing-read-patterns.patch
readahead-remove-size-limit-on-read_ahead_kb.patch
readahead-backward-prefetching-method-fix.patch
readahead-remove-the-size-limit-of-max_sectors_kb-on-read_ahead_kb.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
