[PATCH 2/3] nilfs2: use BIT() macro

From: Ryusuke Konishi
Date: Mon Jun 13 2016 - 09:52:17 EST

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Replace bit shifts by BIT macro for clarity.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/btnode.c | 4 ++--
fs/nilfs2/inode.c | 4 ++--
fs/nilfs2/nilfs.h | 15 +++++++--------
fs/nilfs2/page.c | 26 +++++++++++++-------------
fs/nilfs2/segment.c | 14 +++++++-------
fs/nilfs2/sufile.c | 12 ++++++------
6 files changed, 37 insertions(+), 38 deletions(-)

diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 0576033..7641cc8 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -41,7 +41,7 @@ nilfs_btnode_create_block(struct address_space *btnc, __u64 blocknr)
struct inode *inode = NILFS_BTNC_I(btnc);
struct buffer_head *bh;

- bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node);
+ bh = nilfs_grab_buffer(inode, btnc, blocknr, BIT(BH_NILFS_Node));
if (unlikely(!bh))
return NULL;

@@ -70,7 +70,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
struct page *page;
int err;

- bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node);
+ bh = nilfs_grab_buffer(inode, btnc, blocknr, BIT(BH_NILFS_Node));
if (unlikely(!bh))
return -ENOMEM;

diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index b286b35..af04f55 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -356,7 +356,7 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)

root = NILFS_I(dir)->i_root;
ii = NILFS_I(inode);
- ii->i_state = 1 << NILFS_I_NEW;
+ ii->i_state = BIT(NILFS_I_NEW);
ii->i_root = root;

err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
@@ -555,7 +555,7 @@ static int nilfs_iget_set(struct inode *inode, void *opaque)

inode->i_ino = args->ino;
if (args->for_gc) {
- NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
+ NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
NILFS_I(inode)->i_cno = args->cno;
NILFS_I(inode)->i_root = NULL;
} else {
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index b7064fae..c6b6960 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -119,20 +119,19 @@ enum {
/*
* Macros to check inode numbers
*/
-#define NILFS_MDT_INO_BITS \
- ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \
- 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \
- 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
+#define NILFS_MDT_INO_BITS \
+ (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \
+ BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \
+ BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))

-#define NILFS_SYS_INO_BITS \
- ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
+#define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)

#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)

#define NILFS_MDT_INODE(sb, ino) \
- ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
+ ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
#define NILFS_VALID_INODE(sb, ino) \
- ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
+ ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino)))

/**
* struct nilfs_transaction_info: context information for synchronization
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index eaccf12..f11a3ad 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -30,9 +30,9 @@
#include "mdt.h"

-#define NILFS_BUFFER_INHERENT_BITS \
- ((1UL << BH_Uptodate) | (1UL << BH_Mapped) | (1UL << BH_NILFS_Node) | \
- (1UL << BH_NILFS_Volatile) | (1UL << BH_NILFS_Checked))
+#define NILFS_BUFFER_INHERENT_BITS \
+ (BIT(BH_Uptodate) | BIT(BH_Mapped) | BIT(BH_NILFS_Node) | \
+ BIT(BH_NILFS_Volatile) | BIT(BH_NILFS_Checked))

static struct buffer_head *
__nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
@@ -85,9 +85,9 @@ void nilfs_forget_buffer(struct buffer_head *bh)
{
struct page *page = bh->b_page;
const unsigned long clear_bits =
- (1 << BH_Uptodate | 1 << BH_Dirty | 1 << BH_Mapped |
- 1 << BH_Async_Write | 1 << BH_NILFS_Volatile |
- 1 << BH_NILFS_Checked | 1 << BH_NILFS_Redirected);
+ (BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
+ BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
+ BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));

lock_buffer(bh);
set_mask_bits(&bh->b_state, clear_bits, 0);
@@ -124,17 +124,17 @@ void nilfs_copy_buffer(struct buffer_head *dbh, struct buffer_head *sbh)
dbh->b_bdev = sbh->b_bdev;

bh = dbh;
- bits = sbh->b_state & ((1UL << BH_Uptodate) | (1UL << BH_Mapped));
+ bits = sbh->b_state & (BIT(BH_Uptodate) | BIT(BH_Mapped));
while ((bh = bh->b_this_page) != dbh) {
lock_buffer(bh);
bits &= bh->b_state;
unlock_buffer(bh);
}
- if (bits & (1UL << BH_Uptodate))
+ if (bits & BIT(BH_Uptodate))
SetPageUptodate(dpage);
else
ClearPageUptodate(dpage);
- if (bits & (1UL << BH_Mapped))
+ if (bits & BIT(BH_Mapped))
SetPageMappedToDisk(dpage);
else
ClearPageMappedToDisk(dpage);
@@ -215,7 +215,7 @@ static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
create_empty_buffers(dst, sbh->b_size, 0);

if (copy_dirty)
- mask |= (1UL << BH_Dirty);
+ mask |= BIT(BH_Dirty);

dbh = dbufs = page_buffers(dst);
do {
@@ -414,9 +414,9 @@ void nilfs_clear_dirty_page(struct page *page, bool silent)
if (page_has_buffers(page)) {
struct buffer_head *bh, *head;
const unsigned long clear_bits =
- (1 << BH_Uptodate | 1 << BH_Dirty | 1 << BH_Mapped |
- 1 << BH_Async_Write | 1 << BH_NILFS_Volatile |
- 1 << BH_NILFS_Checked | 1 << BH_NILFS_Redirected);
+ (BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
+ BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
+ BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));

bh = head = page_buffers(page);
do {
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 5a97282..bedcae2 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1858,11 +1858,11 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
*/
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
b_assoc_buffers) {
- const unsigned long set_bits = (1 << BH_Uptodate);
+ const unsigned long set_bits = BIT(BH_Uptodate);
const unsigned long clear_bits =
- (1 << BH_Dirty | 1 << BH_Async_Write |
- 1 << BH_Delay | 1 << BH_NILFS_Volatile |
- 1 << BH_NILFS_Redirected);
+ (BIT(BH_Dirty) | BIT(BH_Async_Write) |
+ BIT(BH_Delay) | BIT(BH_NILFS_Volatile) |
+ BIT(BH_NILFS_Redirected));

set_mask_bits(&bh->b_state, clear_bits, set_bits);
if (bh == segbuf->sb_super_root) {
@@ -2132,10 +2132,10 @@ static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
{
spin_lock(&sci->sc_state_lock);
- if (!(sci->sc_flush_request & (1 << bn))) {
+ if (!(sci->sc_flush_request & BIT(bn))) {
unsigned long prev_req = sci->sc_flush_request;

- sci->sc_flush_request |= (1 << bn);
+ sci->sc_flush_request |= BIT(bn);
if (!prev_req)
wake_up(&sci->sc_wait_daemon);
}
@@ -2319,7 +2319,7 @@ int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
}

#define FLUSH_FILE_BIT (0x1) /* data file only */
-#define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */
+#define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */

/**
* nilfs_segctor_accept - record accepted sequence count of log-write requests
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 5b495c4..12d11de 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -446,7 +446,7 @@ void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,

kaddr = kmap_atomic(su_bh->b_page);
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
- if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) &&
+ if (su->su_flags == cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)) &&
su->su_nblocks == cpu_to_le32(0)) {
kunmap_atomic(kaddr);
return;
@@ -457,7 +457,7 @@ void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
/* make the segment garbage */
su->su_lastmod = cpu_to_le64(0);
su->su_nblocks = cpu_to_le32(0);
- su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY);
+ su->su_flags = cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY));
kunmap_atomic(kaddr);

nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
@@ -695,7 +695,7 @@ static int nilfs_sufile_truncate_range(struct inode *sufile,
su2 = su;
for (j = 0; j < n; j++, su = (void *)su + susz) {
if ((le32_to_cpu(su->su_flags) &
- ~(1UL << NILFS_SEGMENT_USAGE_ERROR)) ||
+ ~BIT(NILFS_SEGMENT_USAGE_ERROR)) ||
nilfs_segment_is_active(nilfs, segnum + j)) {
ret = -EBUSY;
kunmap_atomic(kaddr);
@@ -862,10 +862,10 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
si->sui_lastmod = le64_to_cpu(su->su_lastmod);
si->sui_nblocks = le32_to_cpu(su->su_nblocks);
si->sui_flags = le32_to_cpu(su->su_flags) &
- ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
+ ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
if (nilfs_segment_is_active(nilfs, segnum + j))
si->sui_flags |=
- (1UL << NILFS_SEGMENT_USAGE_ACTIVE);
+ BIT(NILFS_SEGMENT_USAGE_ACTIVE);
}
kunmap_atomic(kaddr);
brelse(su_bh);
@@ -953,7 +953,7 @@ ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
* disk.
*/
sup->sup_sui.sui_flags &=
- ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
+ ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);

cleansi = nilfs_suinfo_clean(&sup->sup_sui);
cleansu = nilfs_segment_usage_clean(su);
--
1.8.3.1

Next message: Tetsuo Handa: "Re: [PATCH] exit: clear TIF_MEMDIE after exit_task_work"
Previous message: Ryusuke Konishi: "[PATCH 3/3] nilfs2: move ioctl interface and disk layout to uapi separately"
In reply to: Ryusuke Konishi: "Re: [PATCH 3/3] nilfs2: move ioctl interface and disk layout to uapi separately"
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