diff options
author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2013-07-19 09:56:44 +1000 |
---|---|---|
committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2013-07-19 09:56:44 +1000 |
commit | 9ed8ffb6ccb1274e6f21e90323cb442c3cee57fc (patch) | |
tree | 6878069ce4d1ef1b57f709d2ece58c18bc6a2819 /mm | |
parent | b75dcf52e7336892eb8c5232626a2a05003b8b07 (diff) |
mm: cleanup add_to_page_cache_locked()
Make add_to_page_cache_locked() cleaner:
- unindent most code of the function by inverting one condition;
- streamline code no-error path;
- move insert error path outside normal code path;
- call radix_tree_preload_end() earlier;
No functional changes.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Hugh Dickins <hughd@google.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/filemap.c | 48 |
1 files changed, 25 insertions, 23 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index f6fe61f70bc3..f1ca99cf5aa8 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -467,32 +467,34 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping, error = mem_cgroup_cache_charge(page, current->mm, gfp_mask & GFP_RECLAIM_MASK); if (error) - goto out; + return error; error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM); - if (error == 0) { - page_cache_get(page); - page->mapping = mapping; - page->index = offset; - - spin_lock_irq(&mapping->tree_lock); - error = radix_tree_insert(&mapping->page_tree, offset, page); - if (likely(!error)) { - mapping->nrpages++; - __inc_zone_page_state(page, NR_FILE_PAGES); - spin_unlock_irq(&mapping->tree_lock); - trace_mm_filemap_add_to_page_cache(page); - } else { - page->mapping = NULL; - /* Leave page->index set: truncation relies upon it */ - spin_unlock_irq(&mapping->tree_lock); - mem_cgroup_uncharge_cache_page(page); - page_cache_release(page); - } - radix_tree_preload_end(); - } else + if (error) { mem_cgroup_uncharge_cache_page(page); -out: + return error; + } + + page_cache_get(page); + page->mapping = mapping; + page->index = offset; + + spin_lock_irq(&mapping->tree_lock); + error = radix_tree_insert(&mapping->page_tree, offset, page); + radix_tree_preload_end(); + if (unlikely(error)) + goto err_insert; + mapping->nrpages++; + __inc_zone_page_state(page, NR_FILE_PAGES); + spin_unlock_irq(&mapping->tree_lock); + trace_mm_filemap_add_to_page_cache(page); + return 0; +err_insert: + page->mapping = NULL; + /* Leave page->index set: truncation relies upon it */ + spin_unlock_irq(&mapping->tree_lock); + mem_cgroup_uncharge_cache_page(page); + page_cache_release(page); return error; } EXPORT_SYMBOL(add_to_page_cache_locked); |