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Subject[PATCH 3/6] f2fs: shrink critical region in spin_lock
Date
This patch shrinks the critical region in spin_lock.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/f2fs.h | 23 ++++++++---------------
1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a05f65b..a51f230 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1156,30 +1156,23 @@ static inline void f2fs_i_blocks_write(struct inode *, blkcnt_t, bool);
static inline bool inc_valid_block_count(struct f2fs_sb_info *sbi,
struct inode *inode, blkcnt_t *count)
{
- block_t valid_block_count;
-
- spin_lock(&sbi->stat_lock);
#ifdef CONFIG_F2FS_FAULT_INJECTION
- if (time_to_inject(FAULT_BLOCK)) {
- spin_unlock(&sbi->stat_lock);
+ if (time_to_inject(FAULT_BLOCK))
return false;
- }
#endif
- valid_block_count =
- sbi->total_valid_block_count + (block_t)(*count);
- if (unlikely(valid_block_count > sbi->user_block_count)) {
- *count = sbi->user_block_count - sbi->total_valid_block_count;
+ spin_lock(&sbi->stat_lock);
+ sbi->total_valid_block_count += (block_t)(*count);
+ if (unlikely(sbi->total_valid_block_count > sbi->user_block_count)) {
+ *count -= sbi->total_valid_block_count - sbi->user_block_count;
+ sbi->total_valid_block_count = sbi->user_block_count;
if (!*count) {
spin_unlock(&sbi->stat_lock);
return false;
}
}
- /* *count can be recalculated */
- f2fs_i_blocks_write(inode, *count, true);
- sbi->total_valid_block_count =
- sbi->total_valid_block_count + (block_t)(*count);
spin_unlock(&sbi->stat_lock);

+ f2fs_i_blocks_write(inode, *count, true);
percpu_counter_add(&sbi->alloc_valid_block_count, (*count));
return true;
}
@@ -1191,9 +1184,9 @@ static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
spin_lock(&sbi->stat_lock);
f2fs_bug_on(sbi, sbi->total_valid_block_count < (block_t) count);
f2fs_bug_on(sbi, inode->i_blocks < count);
- f2fs_i_blocks_write(inode, count, false);
sbi->total_valid_block_count -= (block_t)count;
spin_unlock(&sbi->stat_lock);
+ f2fs_i_blocks_write(inode, count, false);
}

static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
--
2.8.3
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