[PATCH] f2fs: merge flags in struct f2fs_sb_info

From: Chao Yu
Date: Wed Jan 28 2015 - 21:00:16 EST

Currently, there are several variables with Boolean type as below:

struct f2fs_sb_info {
...
int s_dirty;
bool need_fsck;
bool s_closing;
...
bool por_doing;
...
}

For this there are some issues:
1. there are some space of f2fs_sb_info is wasted due to aligning after Boolean
type variables by compiler.
2. if we continuously add new flag into f2fs_sb_info, structure will be messed
up.

So in this patch, we try to:
1. switch s_dirty to Boolean type variable since it has two status 0/1.
2. merge s_dirty/need_fsck/s_closing/por_doing variables into s_flag.
3. introduce an enum type which can indicate different states of sbi.
4. use new introduced universal interfaces is_sbi_flag_set/{set,clear}_sbi_flag
to operate flags for sbi.

After that, above issues will be fixed.

Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx>
---
fs/f2fs/checkpoint.c | 12 ++++++------
fs/f2fs/data.c | 2 +-
fs/f2fs/f2fs.h | 30 ++++++++++++++++++++----------
fs/f2fs/node.c | 4 ++--
fs/f2fs/recovery.c | 4 ++--
fs/f2fs/segment.h | 10 +++++-----
fs/f2fs/super.c | 15 ++++++++-------
include/trace/events/f2fs.h | 4 ++--
8 files changed, 46 insertions(+), 35 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 1ee6162..22165fb 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -190,7 +190,7 @@ static int f2fs_write_meta_page(struct page *page,

trace_f2fs_writepage(page, META);

- if (unlikely(sbi->por_doing))
+ if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
goto redirty_out;
if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
goto redirty_out;
@@ -485,7 +485,7 @@ void recover_orphan_inodes(struct f2fs_sb_info *sbi)
if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
return;

- sbi->por_doing = true;
+ set_sbi_flag(sbi, SBI_POR_DOING);

start_blk = __start_cp_addr(sbi) + 1 +
le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
@@ -506,7 +506,7 @@ void recover_orphan_inodes(struct f2fs_sb_info *sbi)
}
/* clear Orphan Flag */
clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
- sbi->por_doing = false;
+ clear_sbi_flag(sbi, SBI_POR_DOING);
return;
}

@@ -973,7 +973,7 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
else
clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);

- if (sbi->need_fsck)
+ if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
set_ckpt_flags(ckpt, CP_FSCK_FLAG);

/* update SIT/NAT bitmap */
@@ -1047,7 +1047,7 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
return;

clear_prefree_segments(sbi);
- F2FS_RESET_SB_DIRT(sbi);
+ clear_sbi_flag(sbi, SBI_IS_DIRTY);
}

/*
@@ -1062,7 +1062,7 @@ void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)

mutex_lock(&sbi->cp_mutex);

- if (!sbi->s_dirty &&
+ if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
cpc->reason != CP_DISCARD && cpc->reason != CP_UMOUNT)
goto out;
if (unlikely(f2fs_cp_error(sbi)))
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 69b0781..ceaa913 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -838,7 +838,7 @@ static int f2fs_write_data_page(struct page *page,

zero_user_segment(page, offset, PAGE_CACHE_SIZE);
write:
- if (unlikely(sbi->por_doing))
+ if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
goto redirty_out;
if (f2fs_is_drop_cache(inode))
goto out;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ec4d16b..cda56da 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -28,7 +28,7 @@
do { \
if (unlikely(condition)) { \
WARN_ON(1); \
- sbi->need_fsck = true; \
+ set_sbi_flag(sbi, SBI_NEED_FSCK); \
} \
} while (0)
#define f2fs_down_write(x, y) down_write(x)
@@ -516,14 +516,20 @@ struct inode_management {
unsigned long ino_num; /* number of entries */
};

+/* For s_flag in struct f2fs_sb_info */
+enum {
+ SBI_IS_DIRTY, /* dirty flag for checkpoint */
+ SBI_IS_CLOSE, /* specify unmounting */
+ SBI_NEED_FSCK, /* need fsck.f2fs to fix */
+ SBI_POR_DOING, /* recovery is doing or not */
+};
+
struct f2fs_sb_info {
struct super_block *sb; /* pointer to VFS super block */
struct proc_dir_entry *s_proc; /* proc entry */
struct buffer_head *raw_super_buf; /* buffer head of raw sb */
struct f2fs_super_block *raw_super; /* raw super block pointer */
- int s_dirty; /* dirty flag for checkpoint */
- bool need_fsck; /* need fsck.f2fs to fix */
- bool s_closing; /* specify unmounting */
+ int s_flag; /* flags for sbi */

/* for node-related operations */
struct f2fs_nm_info *nm_info; /* node manager */
@@ -543,7 +549,6 @@ struct f2fs_sb_info {
struct rw_semaphore cp_rwsem; /* blocking FS operations */
struct rw_semaphore node_write; /* locking node writes */
struct mutex writepages; /* mutex for writepages() */
- bool por_doing; /* recovery is doing or not */
wait_queue_head_t cp_wait;

struct inode_management im[MAX_INO_ENTRY]; /* manage inode cache */
@@ -696,14 +701,19 @@ static inline struct address_space *NODE_MAPPING(struct f2fs_sb_info *sbi)
return sbi->node_inode->i_mapping;
}

-static inline void F2FS_SET_SB_DIRT(struct f2fs_sb_info *sbi)
+static inline bool is_sbi_flag_set(struct f2fs_sb_info *sbi, unsigned int type)
+{
+ return sbi->s_flag & (0x01 << type);
+}
+
+static inline void set_sbi_flag(struct f2fs_sb_info *sbi, unsigned int type)
{
- sbi->s_dirty = 1;
+ sbi->s_flag |= (0x01 << type);
}

-static inline void F2FS_RESET_SB_DIRT(struct f2fs_sb_info *sbi)
+static inline void clear_sbi_flag(struct f2fs_sb_info *sbi, unsigned int type)
{
- sbi->s_dirty = 0;
+ sbi->s_flag &= ~(0x01 << type);
}

static inline unsigned long long cur_cp_version(struct f2fs_checkpoint *cp)
@@ -815,7 +825,7 @@ static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
{
atomic_inc(&sbi->nr_pages[count_type]);
- F2FS_SET_SB_DIRT(sbi);
+ set_sbi_flag(sbi, SBI_IS_DIRTY);
}

static inline void inode_inc_dirty_pages(struct inode *inode)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index d7c1436..05e6faa 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -588,7 +588,7 @@ static void truncate_node(struct dnode_of_data *dn)
}
invalidate:
clear_node_page_dirty(dn->node_page);
- F2FS_SET_SB_DIRT(sbi);
+ set_sbi_flag(sbi, SBI_IS_DIRTY);

f2fs_put_page(dn->node_page, 1);

@@ -1284,7 +1284,7 @@ static int f2fs_write_node_page(struct page *page,

trace_f2fs_writepage(page, NODE);

- if (unlikely(sbi->por_doing))
+ if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
goto redirty_out;
if (unlikely(f2fs_cp_error(sbi)))
goto redirty_out;
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 82ea0d8..188a034 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -508,7 +508,7 @@ int recover_fsync_data(struct f2fs_sb_info *sbi)
INIT_LIST_HEAD(&inode_list);

/* step #1: find fsynced inode numbers */
- sbi->por_doing = true;
+ set_sbi_flag(sbi, SBI_POR_DOING);

/* prevent checkpoint */
mutex_lock(&sbi->cp_mutex);
@@ -541,7 +541,7 @@ out:
truncate_inode_pages_final(META_MAPPING(sbi));
}

- sbi->por_doing = false;
+ clear_sbi_flag(sbi, SBI_POR_DOING);
if (err) {
discard_next_dnode(sbi, blkaddr);

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 7f327c0..421d579 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -460,7 +460,7 @@ static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);

- if (unlikely(sbi->por_doing))
+ if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
return false;

return (free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +
@@ -599,13 +599,13 @@ static inline void check_block_count(struct f2fs_sb_info *sbi,
static inline void check_seg_range(struct f2fs_sb_info *sbi, unsigned int segno)
{
if (segno > TOTAL_SEGS(sbi) - 1)
- sbi->need_fsck = true;
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
}

static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
{
if (blk_addr < SEG0_BLKADDR(sbi) || blk_addr >= MAX_BLKADDR(sbi))
- sbi->need_fsck = true;
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
}

/*
@@ -616,11 +616,11 @@ static inline void check_block_count(struct f2fs_sb_info *sbi,
{
/* check segment usage */
if (GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg)
- sbi->need_fsck = true;
+ set_sbi_flag(sbi, SBI_NEED_FSCK);

/* check boundary of a given segment number */
if (segno > TOTAL_SEGS(sbi) - 1)
- sbi->need_fsck = true;
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
}
#endif

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 7039969..a6fab27 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -460,7 +460,7 @@ static void f2fs_put_super(struct super_block *sb)
* But, the previous checkpoint was not done by umount, it needs to do
* clean checkpoint again.
*/
- if (sbi->s_dirty ||
+ if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
struct cp_control cpc = {
.reason = CP_UMOUNT,
@@ -500,8 +500,9 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
if (sync) {
struct cp_control cpc;

- cpc.reason = (test_opt(sbi, FASTBOOT) || sbi->s_closing) ?
- CP_UMOUNT : CP_SYNC;
+ cpc.reason = (test_opt(sbi, FASTBOOT) ||
+ is_sbi_flag_set(sbi, SBI_IS_CLOSE)) ?
+ CP_UMOUNT : CP_SYNC;
mutex_lock(&sbi->gc_mutex);
write_checkpoint(sbi, &cpc);
mutex_unlock(&sbi->gc_mutex);
@@ -903,7 +904,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
atomic_set(&sbi->nr_pages[i], 0);

sbi->dir_level = DEF_DIR_LEVEL;
- sbi->need_fsck = false;
+ clear_sbi_flag(sbi, SBI_NEED_FSCK);
}

/*
@@ -1021,7 +1022,7 @@ try_onemore:
mutex_init(&sbi->writepages);
mutex_init(&sbi->cp_mutex);
init_rwsem(&sbi->node_write);
- sbi->por_doing = false;
+ clear_sbi_flag(sbi, SBI_POR_DOING);
spin_lock_init(&sbi->stat_lock);

init_rwsem(&sbi->read_io.io_rwsem);
@@ -1145,7 +1146,7 @@ try_onemore:
goto free_proc;

if (!retry)
- sbi->need_fsck = true;
+ set_sbi_flag(sbi, SBI_NEED_FSCK);

/* recover fsynced data */
if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
@@ -1225,7 +1226,7 @@ static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
static void kill_f2fs_super(struct super_block *sb)
{
if (sb->s_root)
- F2FS_SB(sb)->s_closing = true;
+ set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
kill_block_super(sb);
}

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 13992f3..5e1c029 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -184,13 +184,13 @@ TRACE_EVENT(f2fs_sync_fs,

TP_STRUCT__entry(
__field(dev_t, dev)
- __field(int, dirty)
+ __field(bool, dirty)
__field(int, wait)
),

TP_fast_assign(
__entry->dev = sb->s_dev;
- __entry->dirty = F2FS_SB(sb)->s_dirty;
+ __entry->dirty = is_sbi_flag_set(F2FS_SB(sb), SBI_IS_DIRTY);
__entry->wait = wait;
),

--
2.2.1


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