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Message-ID: <8C3DB78D-BCF8-4FDE-891A-2941486573AC@ddn.com>
Date: Tue, 18 Dec 2018 14:40:02 +0000
From: Wang Shilong <wshilong@....com>
To: "zhangyi (F)" <yi.zhang@...wei.com>,
"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
CC: "tytso@....edu" <tytso@....edu>,
"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
"miaoxie@...wei.com" <miaoxie@...wei.com>
Subject: Re: [PATCH 2/2] ext4: clean up group state test macros with predicate
functions
Hi,
在 2018/12/18 下午7:57，“zhangyi (F)”<yi.zhang@...wei.com> 写入:
Create separate predicate functions to test/set/clear/test_and_set
bb_state flags in ext4_group_info like features testing, and then
replace all old macros and the places where we use
EXT4_GROUP_INFO_XXX_BIT directly.
Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
---
fs/ext4/balloc.c | 6 +++---
fs/ext4/ext4.h | 45 ++++++++++++++++++++++++++-------------------
fs/ext4/ialloc.c | 8 ++++----
fs/ext4/mballoc.c | 35 +++++++++++++++++------------------
fs/ext4/super.c | 4 ++--
5 files changed, 52 insertions(+), 46 deletions(-)
Patch Looks fine, but what is obvious benefits of this patch? except
Converting function name to low-case letter, and patch introduce more 6 lines than before...
Thanks,
Shilong
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index e5d6ee6..082387a 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -364,7 +364,7 @@ static int ext4_validate_block_bitmap(struct super_block *sb,
if (buffer_verified(bh))
return 0;
- if (EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+ if (ext4_mb_grp_bbitmap_corrupt(grp))
return -EFSCORRUPTED;
ext4_lock_group(sb, block_group);
@@ -699,7 +699,7 @@ ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb)
grp = NULL;
if (EXT4_SB(sb)->s_group_info)
grp = ext4_get_group_info(sb, i);
- if (!grp || !EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+ if (!grp || !ext4_mb_grp_bbitmap_corrupt(grp))
desc_count += ext4_free_group_clusters(sb, gdp);
brelse(bitmap_bh);
bitmap_bh = ext4_read_block_bitmap(sb, i);
@@ -729,7 +729,7 @@ ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb)
grp = NULL;
if (EXT4_SB(sb)->s_group_info)
grp = ext4_get_group_info(sb, i);
- if (!grp || !EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+ if (!grp || !ext4_mb_grp_bbitmap_corrupt(grp))
desc_count += ext4_free_group_clusters(sb, gdp);
}
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 755ba14..e460b05 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2882,25 +2882,32 @@ struct ext4_group_info {
#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
-#define EXT4_MB_GRP_NEED_INIT(grp) \
- (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
-#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
- (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
-#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
- (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
-#define EXT4_MB_GRP_TEST_AND_SET_BBITMAP_CORRUPT(grp) \
- (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, \
- &((grp)->bb_state)))
-#define EXT4_MB_GRP_TEST_AND_SET_IBITMAP_CORRUPT(grp) \
- (test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, \
- &((grp)->bb_state)))
-
-#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
- (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
-#define EXT4_MB_GRP_SET_TRIMMED(grp) \
- (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
-#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
- (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
+
+#define EXT4_MB_GROUP_STATE_FUNCS(name, statename) \
+static inline int ext4_mb_grp_##name(struct ext4_group_info *grp) \
+{ \
+ return test_bit(EXT4_GROUP_INFO_##statename##_BIT, \
+ &(grp->bb_state)); \
+} \
+static inline void ext4_mb_grp_set_##name(struct ext4_group_info *grp) \
+{ \
+ set_bit(EXT4_GROUP_INFO_##statename##_BIT, &(grp->bb_state)); \
+} \
+static inline void ext4_mb_grp_clear_##name(struct ext4_group_info *grp)\
+{ \
+ clear_bit(EXT4_GROUP_INFO_##statename##_BIT, &(grp->bb_state)); \
+} \
+static inline int ext4_mb_grp_test_and_set_##name(struct ext4_group_info *grp) \
+{ \
+ return test_and_set_bit(EXT4_GROUP_INFO_##statename##_BIT, \
+ &(grp->bb_state)); \
+}
+
+EXT4_MB_GROUP_STATE_FUNCS(need_init, NEED_INIT)
+EXT4_MB_GROUP_STATE_FUNCS(trimmed, WAS_TRIMMED)
+EXT4_MB_GROUP_STATE_FUNCS(bbitmap_corrupt, BBITMAP_CORRUPT)
+EXT4_MB_GROUP_STATE_FUNCS(ibitmap_corrupt, IBITMAP_CORRUPT)
+
#define EXT4_MAX_CONTENTION 8
#define EXT4_CONTENTION_THRESHOLD 2
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 014f6a6..ca86368 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -86,7 +86,7 @@ static int ext4_validate_inode_bitmap(struct super_block *sb,
if (buffer_verified(bh))
return 0;
- if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
+ if (ext4_mb_grp_ibitmap_corrupt(grp))
return -EFSCORRUPTED;
ext4_lock_group(sb, block_group);
@@ -293,7 +293,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
bitmap_bh = NULL;
goto error_return;
}
- if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp))) {
+ if (unlikely(ext4_mb_grp_ibitmap_corrupt(grp))) {
fatal = -EFSCORRUPTED;
goto error_return;
}
@@ -898,13 +898,13 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
grp = ext4_get_group_info(sb, group);
/* Skip groups with already-known suspicious inode tables */
- if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
+ if (ext4_mb_grp_ibitmap_corrupt(grp))
goto next_group;
brelse(inode_bitmap_bh);
inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
/* Skip groups with suspicious inode tables */
- if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp) ||
+ if (ext4_mb_grp_ibitmap_corrupt(grp) ||
IS_ERR(inode_bitmap_bh)) {
inode_bitmap_bh = NULL;
goto next_group;
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index e224808..4151c76 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -622,7 +622,7 @@ static int __mb_check_buddy(struct ext4_buddy *e4b, char *file,
MB_CHECK_ASSERT(mb_test_bit(k, buddy2));
}
}
- MB_CHECK_ASSERT(!EXT4_MB_GRP_NEED_INIT(e4b->bd_info));
+ MB_CHECK_ASSERT(!ext4_mb_grp_need_init(e4b->bd_info));
MB_CHECK_ASSERT(e4b->bd_info->bb_fragments == fragments);
grp = ext4_get_group_info(sb, e4b->bd_group);
@@ -755,7 +755,7 @@ void ext4_mb_generate_buddy(struct super_block *sb,
}
mb_set_largest_free_order(sb, grp);
- clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));
+ ext4_mb_grp_clear_need_init(grp);
period = get_cycles() - period;
spin_lock(&sbi->s_bal_lock);
@@ -857,7 +857,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp)
* we must skip all initialized uptodate buddies on the page,
* which may be currently in use by an allocating task.
*/
- if (PageUptodate(page) && !EXT4_MB_GRP_NEED_INIT(grinfo)) {
+ if (PageUptodate(page) && !ext4_mb_grp_need_init(grinfo)) {
bh[i] = NULL;
continue;
}
@@ -1050,7 +1050,7 @@ int ext4_mb_init_group(struct super_block *sb, ext4_group_t group, gfp_t gfp)
* page accessed.
*/
ret = ext4_mb_get_buddy_page_lock(sb, group, &e4b, gfp);
- if (ret || !EXT4_MB_GRP_NEED_INIT(this_grp)) {
+ if (ret || !ext4_mb_grp_need_init(this_grp)) {
/*
* somebody initialized the group
* return without doing anything
@@ -1122,7 +1122,7 @@ ext4_mb_load_buddy_gfp(struct super_block *sb, ext4_group_t group,
e4b->bd_buddy_page = NULL;
e4b->bd_bitmap_page = NULL;
- if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
+ if (unlikely(ext4_mb_grp_need_init(grp))) {
/*
* we need full data about the group
* to make a good selection
@@ -1424,7 +1424,7 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
BUG_ON(last >= (sb->s_blocksize << 3));
assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group));
/* Don't bother if the block group is corrupt. */
- if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)))
+ if (unlikely(ext4_mb_grp_bbitmap_corrupt(e4b->bd_info)))
return;
mb_check_buddy(e4b);
@@ -1833,7 +1833,7 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
if (err)
return err;
- if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) {
+ if (unlikely(ext4_mb_grp_bbitmap_corrupt(e4b->bd_info))) {
ext4_mb_unload_buddy(e4b);
return 0;
}
@@ -2046,11 +2046,11 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
if (cr <= 2 && free < ac->ac_g_ex.fe_len)
return 0;
- if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp)))
+ if (unlikely(ext4_mb_grp_bbitmap_corrupt(grp)))
return 0;
/* We only do this if the grp has never been initialized */
- if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
+ if (unlikely(ext4_mb_grp_need_init(grp))) {
int ret = ext4_mb_init_group(ac->ac_sb, group, GFP_NOFS);
if (ret)
return ret;
@@ -2304,7 +2304,7 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
grinfo = ext4_get_group_info(sb, group);
/* Load the group info in memory only if not already loaded. */
- if (unlikely(EXT4_MB_GRP_NEED_INIT(grinfo))) {
+ if (unlikely(ext4_mb_grp_need_init(grinfo))) {
err = ext4_mb_load_buddy(sb, group, &e4b);
if (err) {
seq_printf(seq, "#%-5u: I/O error\n", group);
@@ -2418,8 +2418,7 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
ext4_msg(sb, KERN_ERR, "can't allocate buddy mem");
goto exit_group_info;
}
- set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
- &(meta_group_info[i]->bb_state));
+ ext4_mb_grp_set_need_init(meta_group_info[i]);
/*
* initialize bb_free to be able to skip
@@ -2807,7 +2806,7 @@ static void ext4_free_data_in_buddy(struct super_block *sb,
* is supported and the free blocks will be trimmed online.
*/
if (!test_opt(sb, DISCARD))
- EXT4_MB_GRP_CLEAR_TRIMMED(db);
+ ext4_mb_grp_clear_trimmed(db);
if (!db->bb_free_root.rb_node) {
/* No more items in the per group rb tree
@@ -4790,7 +4789,7 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
overflow = 0;
ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
- if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(
+ if (unlikely(ext4_mb_grp_bbitmap_corrupt(
ext4_get_group_info(sb, block_group))))
return;
@@ -4896,7 +4895,7 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
" with %d", block_group, bit, count,
err);
} else
- EXT4_MB_GRP_CLEAR_TRIMMED(e4b.bd_info);
+ ext4_mb_grp_clear_trimmed(e4b.bd_info);
ext4_lock_group(sb, block_group);
mb_clear_bits(bitmap_bh->b_data, bit, count_clusters);
@@ -5169,7 +5168,7 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
bitmap = e4b.bd_bitmap;
ext4_lock_group(sb, group);
- if (EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) &&
+ if (ext4_mb_grp_trimmed(e4b.bd_info) &&
minblocks >= atomic_read(&EXT4_SB(sb)->s_last_trim_minblks))
goto out;
@@ -5210,7 +5209,7 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
if (!ret) {
ret = count;
- EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info);
+ ext4_mb_grp_set_trimmed(e4b.bd_info);
}
out:
ext4_unlock_group(sb, group);
@@ -5273,7 +5272,7 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
for (group = first_group; group <= last_group; group++) {
grp = ext4_get_group_info(sb, group);
/* We only do this if the grp has never been initialized */
- if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
+ if (unlikely(ext4_mb_grp_need_init(grp))) {
ret = ext4_mb_init_group(sb, group, GFP_NOFS);
if (ret)
break;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 5b83765..d08bcd7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -798,14 +798,14 @@ void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
int ret;
if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
- ret = EXT4_MB_GRP_TEST_AND_SET_BBITMAP_CORRUPT(grp);
+ ret = ext4_mb_grp_test_and_set_bbitmap_corrupt(grp);
if (!ret)
percpu_counter_sub(&sbi->s_freeclusters_counter,
grp->bb_free);
}
if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
- ret = EXT4_MB_GRP_TEST_AND_SET_IBITMAP_CORRUPT(grp);
+ ret = ext4_mb_grp_test_and_set_ibitmap_corrupt(grp);
if (!ret && gdp) {
int count;
--
2.7.4
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