f2fs: merge flags in struct f2fs_sb_info

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@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 79f8281..1902141 100644 (file)
--- 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 a7b905c..6d9e6e4 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -818,7 +818,7 @@ 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 9e1fcc1..5abe083 100644 (file)
--- 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)
@@ -519,14 +519,20 @@ 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 */
@@ -546,7 +552,6 @@ 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 */
@@ -699,14 +704,19 @@ 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)
@@ -818,7 +828,7 @@ 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 (file)
--- 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 57603a7..41afb95 100644 (file)
--- 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 (file)
--- 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 0d627f2..c3aa72f 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -452,7 +452,7 @@ 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,
@@ -492,8 +492,9 @@ 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);
@@ -895,7 +896,7 @@ 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);
 }
 
 /*
@@ -1006,7 +1007,7 @@ 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);
@@ -1130,7 +1131,7 @@ 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)) {
@@ -1199,7 +1200,7 @@ 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 (file)
--- 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;
        ),