lunaix-os/kernel/fs/ext2/alloc.c

   1 #include "ext2.h"
   2
   3 static inline unsigned int
   4 __ext2_global_slot_alloc(struct v_superblock* vsb, int type_sel,
   5                          struct ext2_gdesc** gd_out)
   6 {
   7     struct ext2_sbinfo* sb;
   8     struct ext2_gdesc *pos;
   9     struct llist_header *header;
  10
  11     sb = EXT2_SB(vsb);
  12     header = &sb->free_list_sel[type_sel];
  13
  14     if (type_sel == GDESC_INO_SEL) {
  15         pos = list_entry(header->next, struct ext2_gdesc, free_grps_ino);
  16     }
  17     else {
  18         pos = list_entry(header->next, struct ext2_gdesc, free_grps_blk);
  19     }
  20
  21     int alloc = ext2gd_alloc_slot(pos, type_sel);
  22
  23     if (valid_bmp_slot(alloc)) {
  24         *gd_out = pos;
  25     }
  26
  27     return alloc;
  28 }
  29
  30 int
  31 ext2ino_alloc_slot(struct v_superblock* vsb, struct ext2_gdesc** gd_out)
  32 {
  33     return __ext2_global_slot_alloc(vsb, GDESC_INO_SEL, gd_out);
  34 }
  35
  36 int
  37 ext2db_alloc_slot(struct v_superblock* vsb, struct ext2_gdesc** gd_out)
  38 {
  39     return __ext2_global_slot_alloc(vsb, GDESC_BLK_SEL, gd_out);
  40 }
  41
  42 int
  43 ext2gd_alloc_slot(struct ext2_gdesc* gd, int type_sel)
  44 {
  45     struct ext2_bmp* bmp;
  46     struct ext2_sbinfo *sb;
  47     int alloc;
  48
  49     sb = gd->sb;
  50     bmp = &gd->bmps[type_sel];
  51     alloc = ext2bmp_alloc_one(bmp);
  52
  53     if (alloc < 0) {
  54         return alloc;
  55     }
  56
  57     if (!ext2bmp_check_free(bmp)) {
  58         llist_delete(&gd->free_list_sel[type_sel]);
  59     }
  60
  61     if (type_sel == GDESC_INO_SEL) {
  62         gd->info->bg_free_ino_cnt--;
  63         sb->raw->s_free_ino_cnt--;
  64     } else {
  65         gd->info->bg_free_blk_cnt--;
  66         sb->raw->s_free_blk_cnt--;
  67     }
  68
  69     fsblock_dirty(gd->buf);
  70     fsblock_dirty(sb->buf);
  71     return alloc;
  72 }
  73
  74 void
  75 ext2gd_free_slot(struct ext2_gdesc* gd, int type_sel, int slot)
  76 {
  77     struct llist_header *free_ent, *free_list;
  78     struct ext2_sbinfo *sb;
  79
  80     ext2bmp_free_one(&gd->bmps[type_sel], slot);
  81
  82     sb = gd->sb;
  83     free_ent  = &gd->free_list_sel[slot];
  84     free_list = &gd->sb->free_list_sel[slot];
  85     if (llist_empty(free_ent)) {
  86         llist_append(free_list, free_ent);
  87     }
  88
  89     if (type_sel == GDESC_INO_SEL) {
  90         gd->info->bg_free_ino_cnt++;
  91         sb->raw->s_free_ino_cnt++;
  92     } else {
  93         gd->info->bg_free_blk_cnt++;
  94         sb->raw->s_free_blk_cnt++;
  95     }
  96
  97     fsblock_dirty(gd->buf);
  98     fsblock_dirty(sb->buf);
  99 }