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authorDavid Sterba <dsterba@suse.cz>2015-01-14 19:52:13 +0100
committerChris Mason <clm@fb.com>2015-01-21 18:02:04 -0800
commit9ee49a047dc53fd21808cbb7f3b6a3345463e834 (patch)
tree98710aa584c84501c00ecf2227138ff4f44d5396 /fs
parent5efa0490cc94aee06cd8d282683e22a8ce0a0026 (diff)
downloadop-kernel-dev-9ee49a047dc53fd21808cbb7f3b6a3345463e834.zip
op-kernel-dev-9ee49a047dc53fd21808cbb7f3b6a3345463e834.tar.gz
btrfs: switch extent_state state to unsigned
Currently there's a 4B hole in the structure between refs and state and there are only 16 bits used so we can make it unsigned. This will get a better packing and may save some stack space for local variables. The size of extent_state gets reduced by 8B and there are usually a lot of slab objects. struct extent_state { u64 start; /* 0 8 */ u64 end; /* 8 8 */ struct rb_node rb_node; /* 16 24 */ wait_queue_head_t wq; /* 40 24 */ /* --- cacheline 1 boundary (64 bytes) --- */ atomic_t refs; /* 64 4 */ /* XXX 4 bytes hole, try to pack */ long unsigned int state; /* 72 8 */ u64 private; /* 80 8 */ /* size: 88, cachelines: 2, members: 7 */ /* sum members: 84, holes: 1, sum holes: 4 */ /* last cacheline: 24 bytes */ }; Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent_io.c45
-rw-r--r--fs/btrfs/extent_io.h58
-rw-r--r--fs/btrfs/inode.c4
-rw-r--r--fs/btrfs/tests/extent-io-tests.c3
4 files changed, 55 insertions, 55 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c4ca90a..65bd285 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -64,7 +64,7 @@ void btrfs_leak_debug_check(void)
while (!list_empty(&states)) {
state = list_entry(states.next, struct extent_state, leak_list);
- pr_err("BTRFS: state leak: start %llu end %llu state %lu in tree %d refs %d\n",
+ pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n",
state->start, state->end, state->state,
extent_state_in_tree(state),
atomic_read(&state->refs));
@@ -396,21 +396,21 @@ static void merge_state(struct extent_io_tree *tree,
}
static void set_state_cb(struct extent_io_tree *tree,
- struct extent_state *state, unsigned long *bits)
+ struct extent_state *state, unsigned *bits)
{
if (tree->ops && tree->ops->set_bit_hook)
tree->ops->set_bit_hook(tree->mapping->host, state, bits);
}
static void clear_state_cb(struct extent_io_tree *tree,
- struct extent_state *state, unsigned long *bits)
+ struct extent_state *state, unsigned *bits)
{
if (tree->ops && tree->ops->clear_bit_hook)
tree->ops->clear_bit_hook(tree->mapping->host, state, bits);
}
static void set_state_bits(struct extent_io_tree *tree,
- struct extent_state *state, unsigned long *bits);
+ struct extent_state *state, unsigned *bits);
/*
* insert an extent_state struct into the tree. 'bits' are set on the
@@ -426,7 +426,7 @@ static int insert_state(struct extent_io_tree *tree,
struct extent_state *state, u64 start, u64 end,
struct rb_node ***p,
struct rb_node **parent,
- unsigned long *bits)
+ unsigned *bits)
{
struct rb_node *node;
@@ -511,10 +511,10 @@ static struct extent_state *next_state(struct extent_state *state)
*/
static struct extent_state *clear_state_bit(struct extent_io_tree *tree,
struct extent_state *state,
- unsigned long *bits, int wake)
+ unsigned *bits, int wake)
{
struct extent_state *next;
- unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS;
+ unsigned bits_to_clear = *bits & ~EXTENT_CTLBITS;
if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) {
u64 range = state->end - state->start + 1;
@@ -570,7 +570,7 @@ static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
* This takes the tree lock, and returns 0 on success and < 0 on error.
*/
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, int wake, int delete,
+ unsigned bits, int wake, int delete,
struct extent_state **cached_state,
gfp_t mask)
{
@@ -789,9 +789,9 @@ out:
static void set_state_bits(struct extent_io_tree *tree,
struct extent_state *state,
- unsigned long *bits)
+ unsigned *bits)
{
- unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS;
+ unsigned bits_to_set = *bits & ~EXTENT_CTLBITS;
set_state_cb(tree, state, bits);
if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) {
@@ -803,7 +803,7 @@ static void set_state_bits(struct extent_io_tree *tree,
static void cache_state_if_flags(struct extent_state *state,
struct extent_state **cached_ptr,
- const u64 flags)
+ unsigned flags)
{
if (cached_ptr && !(*cached_ptr)) {
if (!flags || (state->state & flags)) {
@@ -833,7 +833,7 @@ static void cache_state(struct extent_state *state,
static int __must_check
__set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, unsigned long exclusive_bits,
+ unsigned bits, unsigned exclusive_bits,
u64 *failed_start, struct extent_state **cached_state,
gfp_t mask)
{
@@ -1034,7 +1034,7 @@ search_again:
}
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, u64 * failed_start,
+ unsigned bits, u64 * failed_start,
struct extent_state **cached_state, gfp_t mask)
{
return __set_extent_bit(tree, start, end, bits, 0, failed_start,
@@ -1060,7 +1060,7 @@ int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
* boundary bits like LOCK.
*/
int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, unsigned long clear_bits,
+ unsigned bits, unsigned clear_bits,
struct extent_state **cached_state, gfp_t mask)
{
struct extent_state *state;
@@ -1268,14 +1268,14 @@ int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
}
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, gfp_t mask)
+ unsigned bits, gfp_t mask)
{
return set_extent_bit(tree, start, end, bits, NULL,
NULL, mask);
}
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, gfp_t mask)
+ unsigned bits, gfp_t mask)
{
return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask);
}
@@ -1330,10 +1330,11 @@ int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
* us if waiting is desired.
*/
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, struct extent_state **cached_state)
+ unsigned bits, struct extent_state **cached_state)
{
int err;
u64 failed_start;
+
while (1) {
err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits,
EXTENT_LOCKED, &failed_start,
@@ -1440,7 +1441,7 @@ static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
*/
static struct extent_state *
find_first_extent_bit_state(struct extent_io_tree *tree,
- u64 start, unsigned long bits)
+ u64 start, unsigned bits)
{
struct rb_node *node;
struct extent_state *state;
@@ -1474,7 +1475,7 @@ out:
* If nothing was found, 1 is returned. If found something, return 0.
*/
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
- u64 *start_ret, u64 *end_ret, unsigned long bits,
+ u64 *start_ret, u64 *end_ret, unsigned bits,
struct extent_state **cached_state)
{
struct extent_state *state;
@@ -1753,7 +1754,7 @@ out_failed:
int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
struct page *locked_page,
- unsigned long clear_bits,
+ unsigned clear_bits,
unsigned long page_ops)
{
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
@@ -1810,7 +1811,7 @@ int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
*/
u64 count_range_bits(struct extent_io_tree *tree,
u64 *start, u64 search_end, u64 max_bytes,
- unsigned long bits, int contig)
+ unsigned bits, int contig)
{
struct rb_node *node;
struct extent_state *state;
@@ -1928,7 +1929,7 @@ out:
* range is found set.
*/
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, int filled, struct extent_state *cached)
+ unsigned bits, int filled, struct extent_state *cached)
{
struct extent_state *state = NULL;
struct rb_node *node;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 71268e5..695b0cc 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -4,22 +4,22 @@
#include <linux/rbtree.h>
/* bits for the extent state */
-#define EXTENT_DIRTY 1
-#define EXTENT_WRITEBACK (1 << 1)
-#define EXTENT_UPTODATE (1 << 2)
-#define EXTENT_LOCKED (1 << 3)
-#define EXTENT_NEW (1 << 4)
-#define EXTENT_DELALLOC (1 << 5)
-#define EXTENT_DEFRAG (1 << 6)
-#define EXTENT_BOUNDARY (1 << 9)
-#define EXTENT_NODATASUM (1 << 10)
-#define EXTENT_DO_ACCOUNTING (1 << 11)
-#define EXTENT_FIRST_DELALLOC (1 << 12)
-#define EXTENT_NEED_WAIT (1 << 13)
-#define EXTENT_DAMAGED (1 << 14)
-#define EXTENT_NORESERVE (1 << 15)
-#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
-#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
+#define EXTENT_DIRTY (1U << 0)
+#define EXTENT_WRITEBACK (1U << 1)
+#define EXTENT_UPTODATE (1U << 2)
+#define EXTENT_LOCKED (1U << 3)
+#define EXTENT_NEW (1U << 4)
+#define EXTENT_DELALLOC (1U << 5)
+#define EXTENT_DEFRAG (1U << 6)
+#define EXTENT_BOUNDARY (1U << 9)
+#define EXTENT_NODATASUM (1U << 10)
+#define EXTENT_DO_ACCOUNTING (1U << 11)
+#define EXTENT_FIRST_DELALLOC (1U << 12)
+#define EXTENT_NEED_WAIT (1U << 13)
+#define EXTENT_DAMAGED (1U << 14)
+#define EXTENT_NORESERVE (1U << 15)
+#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
+#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
/*
* flags for bio submission. The high bits indicate the compression
@@ -81,9 +81,9 @@ struct extent_io_ops {
int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
struct extent_state *state, int uptodate);
void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
- unsigned long *bits);
+ unsigned *bits);
void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
- unsigned long *bits);
+ unsigned *bits);
void (*merge_extent_hook)(struct inode *inode,
struct extent_state *new,
struct extent_state *other);
@@ -108,7 +108,7 @@ struct extent_state {
/* ADD NEW ELEMENTS AFTER THIS */
wait_queue_head_t wq;
atomic_t refs;
- unsigned long state;
+ unsigned state;
/* for use by the FS */
u64 private;
@@ -188,7 +188,7 @@ int try_release_extent_mapping(struct extent_map_tree *map,
int try_release_extent_buffer(struct page *page);
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, struct extent_state **cached);
+ unsigned bits, struct extent_state **cached);
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached, gfp_t mask);
@@ -202,21 +202,21 @@ void extent_io_exit(void);
u64 count_range_bits(struct extent_io_tree *tree,
u64 *start, u64 search_end,
- u64 max_bytes, unsigned long bits, int contig);
+ u64 max_bytes, unsigned bits, int contig);
void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, int filled,
+ unsigned bits, int filled,
struct extent_state *cached_state);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, gfp_t mask);
+ unsigned bits, gfp_t mask);
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, int wake, int delete,
+ unsigned bits, int wake, int delete,
struct extent_state **cached, gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, gfp_t mask);
+ unsigned bits, gfp_t mask);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, u64 *failed_start,
+ unsigned bits, u64 *failed_start,
struct extent_state **cached_state, gfp_t mask);
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached_state, gfp_t mask);
@@ -229,14 +229,14 @@ int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- unsigned long bits, unsigned long clear_bits,
+ unsigned bits, unsigned clear_bits,
struct extent_state **cached_state, gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached_state, gfp_t mask);
int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached_state, gfp_t mask);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
- u64 *start_ret, u64 *end_ret, unsigned long bits,
+ u64 *start_ret, u64 *end_ret, unsigned bits,
struct extent_state **cached_state);
int extent_invalidatepage(struct extent_io_tree *tree,
struct page *page, unsigned long offset);
@@ -323,7 +323,7 @@ int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
struct page *locked_page,
- unsigned long bits_to_clear,
+ unsigned bits_to_clear,
unsigned long page_ops);
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5e52920..220f0c3 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1604,7 +1604,7 @@ static void btrfs_del_delalloc_inode(struct btrfs_root *root,
* have pending delalloc work to be done.
*/
static void btrfs_set_bit_hook(struct inode *inode,
- struct extent_state *state, unsigned long *bits)
+ struct extent_state *state, unsigned *bits)
{
if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC))
@@ -1645,7 +1645,7 @@ static void btrfs_set_bit_hook(struct inode *inode,
*/
static void btrfs_clear_bit_hook(struct inode *inode,
struct extent_state *state,
- unsigned long *bits)
+ unsigned *bits)
{
u64 len = state->end + 1 - state->start;
diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c
index 7e99c2f..9e9f236 100644
--- a/fs/btrfs/tests/extent-io-tests.c
+++ b/fs/btrfs/tests/extent-io-tests.c
@@ -258,8 +258,7 @@ static int test_find_delalloc(void)
}
ret = 0;
out_bits:
- clear_extent_bits(&tmp, 0, total_dirty - 1,
- (unsigned long)-1, GFP_NOFS);
+ clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1, GFP_NOFS);
out:
if (locked_page)
page_cache_release(locked_page);
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