ldiskfs/kernel_patches/patches/linux-5.8/ext4-export-mb-stream-allocator-variables.patch

   1 ---
   2  fs/ext4/ext4.h    |    2 +
   3  fs/ext4/mballoc.c |   58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
   4  fs/ext4/sysfs.c   |    4 +++
   5  3 files changed, 64 insertions(+)
   6
   7 --- a/fs/ext4/ext4.h
   8 +++ b/fs/ext4/ext4.h
   9 @@ -2808,6 +2808,8 @@ extern void ext4_end_bitmap_read(struct
  10  /* mballoc.c */
  11  extern const struct proc_ops ext4_seq_prealloc_table_fops;
  12  extern const struct seq_operations ext4_mb_seq_groups_ops;
  13 +extern const struct proc_ops ext4_seq_mb_last_group_fops;
  14 +extern int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v);
  15  extern long ext4_mb_stats;
  16  extern long ext4_mb_max_to_scan;
  17  extern int ext4_mb_init(struct super_block *);
  18 --- a/fs/ext4/mballoc.c
  19 +++ b/fs/ext4/mballoc.c
  20 @@ -2574,6 +2574,64 @@ static struct kmem_cache *get_groupinfo_
  21         return cachep;
  22  }
  23
  24 +#define EXT4_MB_MAX_INPUT_STRING_SIZE 32
  25 +
  26 +static ssize_t ext4_mb_last_group_write(struct file *file,
  27 +                                       const char __user *buf,
  28 +                                       size_t cnt, loff_t *pos)
  29 +{
  30 +       char dummy[EXT4_MB_MAX_INPUT_STRING_SIZE + 1];
  31 +       struct super_block *sb = PDE_DATA(file_inode(file));
  32 +       struct ext4_sb_info *sbi = EXT4_SB(sb);
  33 +       unsigned long val;
  34 +       char *end;
  35 +
  36 +       if (cnt > EXT4_MB_MAX_INPUT_STRING_SIZE)
  37 +               return -EINVAL;
  38 +       if (copy_from_user(dummy, buf, cnt))
  39 +               return -EFAULT;
  40 +       dummy[cnt] = '\0';
  41 +       val = simple_strtoul(dummy, &end, 0);
  42 +       if (dummy == end)
  43 +               return -EINVAL;
  44 +       if (val >= ext4_get_groups_count(sb))
  45 +               return -ERANGE;
  46 +       spin_lock(&sbi->s_md_lock);
  47 +       sbi->s_mb_last_group = val;
  48 +       sbi->s_mb_last_start = 0;
  49 +       spin_unlock(&sbi->s_md_lock);
  50 +       return cnt;
  51 +}
  52 +
  53 +static int ext4_mb_seq_last_group_seq_show(struct seq_file *m, void *v)
  54 +{
  55 +       struct ext4_sb_info *sbi = EXT4_SB(m->private);
  56 +
  57 +       seq_printf(m , "%ld\n", sbi->s_mb_last_group);
  58 +       return 0;
  59 +}
  60 +
  61 +static int ext4_mb_seq_last_group_open(struct inode *inode, struct file *file)
  62 +{
  63 +       return single_open(file, ext4_mb_seq_last_group_seq_show, PDE_DATA(inode));
  64 +}
  65 +
  66 +const struct proc_ops ext4_seq_mb_last_group_fops = {
  67 +       .proc_open      = ext4_mb_seq_last_group_open,
  68 +       .proc_read      = seq_read,
  69 +       .proc_lseek     = seq_lseek,
  70 +       .proc_release   = seq_release,
  71 +       .proc_write     = ext4_mb_last_group_write,
  72 +};
  73 +
  74 +int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v)
  75 +{
  76 +       struct ext4_sb_info *sbi = EXT4_SB(m->private);
  77 +
  78 +       seq_printf(m , "%ld\n", sbi->s_mb_last_start);
  79 +       return 0;
  80 +}
  81 +
  82  /*
  83   * Allocate the top-level s_group_info array for the specified number
  84   * of groups
  85 --- a/fs/ext4/sysfs.c
  86 +++ b/fs/ext4/sysfs.c
  87 @@ -524,6 +524,10 @@ int ext4_register_sysfs(struct super_blo
  88                                 &ext4_mb_seq_groups_ops, sb);
  89                 proc_create_data("prealloc_table", S_IRUGO, sbi->s_proc,
  90                                 &ext4_seq_prealloc_table_fops, sb);
  91 +               proc_create_data("mb_last_group", S_IRUGO, sbi->s_proc,
  92 +                               &ext4_seq_mb_last_group_fops, sb);
  93 +               proc_create_single_data("mb_last_start", S_IRUGO, sbi->s_proc,
  94 +                               ext4_mb_seq_last_start_seq_show, sb);
  95         }
  96         return 0;
  97  }