fs/ext4/extents_status.h

   1 /*
   2  *  fs/ext4/extents_status.h
   3  *
   4  * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
   5  * Modified by
   6  *      Allison Henderson <achender@linux.vnet.ibm.com>
   7  *      Zheng Liu <wenqing.lz@taobao.com>
   8  *
   9  */
  10
  11 #ifndef _EXT4_EXTENTS_STATUS_H
  12 #define _EXT4_EXTENTS_STATUS_H
  13
  14 /*
  15  * Turn on ES_DEBUG__ to get lots of info about extent status operations.
  16  */
  17 #ifdef ES_DEBUG__
  18 #define es_debug(fmt, ...)      printk(fmt, ##__VA_ARGS__)
  19 #else
  20 #define es_debug(fmt, ...)      no_printk(fmt, ##__VA_ARGS__)
  21 #endif
  22
  23 #define EXTENT_STATUS_WRITTEN   0x80000000      /* written extent */
  24 #define EXTENT_STATUS_UNWRITTEN 0x40000000      /* unwritten extent */
  25 #define EXTENT_STATUS_DELAYED   0x20000000      /* delayed extent */
  26 #define EXTENT_STATUS_HOLE      0x10000000      /* hole */
  27
  28 #define EXTENT_STATUS_FLAGS     (EXTENT_STATUS_WRITTEN | \
  29                                  EXTENT_STATUS_UNWRITTEN | \
  30                                  EXTENT_STATUS_DELAYED | \
  31                                  EXTENT_STATUS_HOLE)
  32
  33 struct extent_status {
  34         struct rb_node rb_node;
  35         ext4_lblk_t es_lblk;    /* first logical block extent covers */
  36         ext4_lblk_t es_len;     /* length of extent in block */
  37         ext4_fsblk_t es_pblk;   /* first physical block */
  38 };
  39
  40 struct ext4_es_tree {
  41         struct rb_root root;
  42         struct extent_status *cache_es; /* recently accessed extent */
  43 };
  44
  45 extern int __init ext4_init_es(void);
  46 extern void ext4_exit_es(void);
  47 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
  48
  49 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
  50                                  ext4_lblk_t len, ext4_fsblk_t pblk,
  51                                  unsigned long long status);
  52 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
  53                                  ext4_lblk_t len);
  54 extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk,
  55                                         struct extent_status *es);
  56
  57 static inline int ext4_es_is_written(struct extent_status *es)
  58 {
  59         return (es->es_pblk & EXTENT_STATUS_WRITTEN);
  60 }
  61
  62 static inline int ext4_es_is_unwritten(struct extent_status *es)
  63 {
  64         return (es->es_pblk & EXTENT_STATUS_UNWRITTEN);
  65 }
  66
  67 static inline int ext4_es_is_delayed(struct extent_status *es)
  68 {
  69         return (es->es_pblk & EXTENT_STATUS_DELAYED);
  70 }
  71
  72 static inline int ext4_es_is_hole(struct extent_status *es)
  73 {
  74         return (es->es_pblk & EXTENT_STATUS_HOLE);
  75 }
  76
  77 static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
  78 {
  79         return (es->es_pblk & EXTENT_STATUS_FLAGS);
  80 }
  81
  82 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
  83 {
  84         return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
  85 }
  86
  87 static inline void ext4_es_store_pblock(struct extent_status *es,
  88                                         ext4_fsblk_t pb)
  89 {
  90         ext4_fsblk_t block;
  91
  92         block = (pb & ~EXTENT_STATUS_FLAGS) |
  93                 (es->es_pblk & EXTENT_STATUS_FLAGS);
  94         es->es_pblk = block;
  95 }
  96
  97 static inline void ext4_es_store_status(struct extent_status *es,
  98                                         unsigned long long status)
  99 {
 100         ext4_fsblk_t block;
 101
 102         block = (status & EXTENT_STATUS_FLAGS) |
 103                 (es->es_pblk & ~EXTENT_STATUS_FLAGS);
 104         es->es_pblk = block;
 105 }
 106
 107 #endif /* _EXT4_EXTENTS_STATUS_H */