f2fs: add proc entry to show valid block bitmap

This patch adds a new proc entry to show segment information in more detail.

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

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b006de60e99b21f4a899508a81fb2f0369809fcc..90d4b864590c2e23de11282917e1eb2adf52e546 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -539,6 +539,7 @@ static void f2fs_put_super(struct super_block *sb)
 
        if (sbi->s_proc) {
                remove_proc_entry("segment_info", sbi->s_proc);
+               remove_proc_entry("segment_bits", sbi->s_proc);
                remove_proc_entry(sb->s_id, f2fs_proc_root);
        }
        kobject_del(&sbi->s_kobj);
@@ -745,6 +746,30 @@ static int segment_info_seq_show(struct seq_file *seq, void *offset)
        return 0;
 }
 
+static int segment_bits_seq_show(struct seq_file *seq, void *offset)
+{
+       struct super_block *sb = seq->private;
+       struct f2fs_sb_info *sbi = F2FS_SB(sb);
+       unsigned int total_segs =
+                       le32_to_cpu(sbi->raw_super->segment_count_main);
+       int i, j;
+
+       seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
+               "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
+
+       for (i = 0; i < total_segs; i++) {
+               struct seg_entry *se = get_seg_entry(sbi, i);
+
+               seq_printf(seq, "%-10d", i);
+               seq_printf(seq, "%d|%-3u|", se->type,
+                                       get_valid_blocks(sbi, i, 1));
+               for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
+                       seq_printf(seq, "%x ", se->cur_valid_map[j]);
+               seq_putc(seq, '\n');
+       }
+       return 0;
+}
+
 #define F2FS_PROC_FILE_DEF(_name)                                      \
 static int _name##_open_fs(struct inode *inode, struct file *file)     \
 {                                                                      \
@@ -760,6 +785,7 @@ static const struct file_operations f2fs_seq_##_name##_fops = {             \
 };
 
 F2FS_PROC_FILE_DEF(segment_info);
+F2FS_PROC_FILE_DEF(segment_bits);
 
 static void default_options(struct f2fs_sb_info *sbi)
 {
@@ -1541,9 +1567,12 @@ try_onemore:
        if (f2fs_proc_root)
                sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
 
-       if (sbi->s_proc)
+       if (sbi->s_proc) {
                proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
                                 &f2fs_seq_segment_info_fops, sb);
+               proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
+                                &f2fs_seq_segment_bits_fops, sb);
+       }
 
        sbi->s_kobj.kset = f2fs_kset;
        init_completion(&sbi->s_kobj_unregister);
@@ -1619,6 +1648,7 @@ free_kobj:
 free_proc:
        if (sbi->s_proc) {
                remove_proc_entry("segment_info", sbi->s_proc);
+               remove_proc_entry("segment_bits", sbi->s_proc);
                remove_proc_entry(sb->s_id, f2fs_proc_root);
        }
        f2fs_destroy_stats(sbi);