btrfs: switch types to int when counting eb pages

The loops iterating eb pages use unsigned long, that's an overkill as
we know that there are at most 16 pages (64k / 4k), and 4 by default
(with nodesize 16k).

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fd34c749209eaf92c7f9db8760197dedb2fc21c3..4fc37e284a79929fcd5cf4ca8fa86e82d57c5372 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2059,7 +2059,7 @@ int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
                         struct extent_buffer *eb, int mirror_num)
 {
        u64 start = eb->start;
-       unsigned long i, num_pages = num_extent_pages(eb);
+       int i, num_pages = num_extent_pages(eb);
        int ret = 0;
 
        if (sb_rdonly(fs_info->sb))
@@ -3538,7 +3538,7 @@ lock_extent_buffer_for_io(struct extent_buffer *eb,
                          struct btrfs_fs_info *fs_info,
                          struct extent_page_data *epd)
 {
-       unsigned long i, num_pages;
+       int i, num_pages;
        int flush = 0;
        int ret = 0;
 
@@ -3712,7 +3712,7 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
        struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
        u64 offset = eb->start;
        u32 nritems;
-       unsigned long i, num_pages;
+       int i, num_pages;
        unsigned long start, end;
        unsigned int write_flags = wbc_to_write_flags(wbc) | REQ_META;
        int ret = 0;
@@ -4647,7 +4647,7 @@ int extent_buffer_under_io(struct extent_buffer *eb)
  */
 static void btrfs_release_extent_buffer_page(struct extent_buffer *eb)
 {
-       unsigned long index;
+       int index;
        struct page *page;
        int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags);
 
@@ -4743,10 +4743,10 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
 
 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
 {
-       unsigned long i;
+       int i;
        struct page *p;
        struct extent_buffer *new;
-       unsigned long num_pages = num_extent_pages(src);
+       int num_pages = num_extent_pages(src);
 
        new = __alloc_extent_buffer(src->fs_info, src->start, src->len);
        if (new == NULL)
@@ -4775,8 +4775,8 @@ struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
                                                  u64 start, unsigned long len)
 {
        struct extent_buffer *eb;
-       unsigned long num_pages;
-       unsigned long i;
+       int num_pages;
+       int i;
 
        eb = __alloc_extent_buffer(fs_info, start, len);
        if (!eb)
@@ -4842,7 +4842,7 @@ static void check_buffer_tree_ref(struct extent_buffer *eb)
 static void mark_extent_buffer_accessed(struct extent_buffer *eb,
                struct page *accessed)
 {
-       unsigned long num_pages, i;
+       int num_pages, i;
 
        check_buffer_tree_ref(eb);
 
@@ -4943,8 +4943,8 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
                                          u64 start)
 {
        unsigned long len = fs_info->nodesize;
-       unsigned long num_pages;
-       unsigned long i;
+       int num_pages;
+       int i;
        unsigned long index = start >> PAGE_SHIFT;
        struct extent_buffer *eb;
        struct extent_buffer *exists = NULL;
@@ -5159,8 +5159,8 @@ void free_extent_buffer_stale(struct extent_buffer *eb)
 
 void clear_extent_buffer_dirty(struct extent_buffer *eb)
 {
-       unsigned long i;
-       unsigned long num_pages;
+       int i;
+       int num_pages;
        struct page *page;
 
        num_pages = num_extent_pages(eb);
@@ -5189,8 +5189,8 @@ void clear_extent_buffer_dirty(struct extent_buffer *eb)
 
 int set_extent_buffer_dirty(struct extent_buffer *eb)
 {
-       unsigned long i;
-       unsigned long num_pages;
+       int i;
+       int num_pages;
        int was_dirty = 0;
 
        check_buffer_tree_ref(eb);
@@ -5208,9 +5208,9 @@ int set_extent_buffer_dirty(struct extent_buffer *eb)
 
 void clear_extent_buffer_uptodate(struct extent_buffer *eb)
 {
-       unsigned long i;
+       int i;
        struct page *page;
-       unsigned long num_pages;
+       int num_pages;
 
        clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
        num_pages = num_extent_pages(eb);
@@ -5223,9 +5223,9 @@ void clear_extent_buffer_uptodate(struct extent_buffer *eb)
 
 void set_extent_buffer_uptodate(struct extent_buffer *eb)
 {
-       unsigned long i;
+       int i;
        struct page *page;
-       unsigned long num_pages;
+       int num_pages;
 
        set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
        num_pages = num_extent_pages(eb);
@@ -5238,13 +5238,13 @@ void set_extent_buffer_uptodate(struct extent_buffer *eb)
 int read_extent_buffer_pages(struct extent_io_tree *tree,
                             struct extent_buffer *eb, int wait, int mirror_num)
 {
-       unsigned long i;
+       int i;
        struct page *page;
        int err;
        int ret = 0;
        int locked_pages = 0;
        int all_uptodate = 1;
-       unsigned long num_pages;
+       int num_pages;
        unsigned long num_reads = 0;
        struct bio *bio = NULL;
        unsigned long bio_flags = 0;
@@ -5576,7 +5576,7 @@ void copy_extent_buffer_full(struct extent_buffer *dst,
                             struct extent_buffer *src)
 {
        int i;
-       unsigned num_pages;
+       int num_pages;
 
        ASSERT(dst->len == src->len);
 

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 7a3c15b55f2b4139f6dc95675f873b00a3dda40d..48f1ee9ad3793766807ed657fffdf7f3a011144b 100644 (file)
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -440,7 +440,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
                             int mirror_num);
 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 
-static inline unsigned long num_extent_pages(const struct extent_buffer *eb)
+static inline int num_extent_pages(const struct extent_buffer *eb)
 {
        return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
               (eb->start >> PAGE_SHIFT);