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 /*
  24  * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
  25  * checked with old map_block's result.
  26  */
  27 #define ES_AGGRESSIVE_TEST__
  28
  29 /*
  30  * These flags live in the high bits of extent_status.es_pblk
  31  */
  32 #define EXTENT_STATUS_WRITTEN   (1ULL << 63)
  33 #define EXTENT_STATUS_UNWRITTEN (1ULL << 62)
  34 #define EXTENT_STATUS_DELAYED   (1ULL << 61)
  35 #define EXTENT_STATUS_HOLE      (1ULL << 60)
  36
  37 #define EXTENT_STATUS_FLAGS     (EXTENT_STATUS_WRITTEN | \
  38                                  EXTENT_STATUS_UNWRITTEN | \
  39                                  EXTENT_STATUS_DELAYED | \
  40                                  EXTENT_STATUS_HOLE)
  41
  42 struct ext4_sb_info;
  43 struct ext4_extent;
  44
  45 struct extent_status {
  46         struct rb_node rb_node;
  47         ext4_lblk_t es_lblk;    /* first logical block extent covers */
  48         ext4_lblk_t es_len;     /* length of extent in block */
  49         ext4_fsblk_t es_pblk;   /* first physical block */
  50 };
  51
  52 struct ext4_es_tree {
  53         struct rb_root root;
  54         struct extent_status *cache_es; /* recently accessed extent */
  55 };
  56
  57 extern int __init ext4_init_es(void);
  58 extern void ext4_exit_es(void);
  59 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
  60
  61 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
  62                                  ext4_lblk_t len, ext4_fsblk_t pblk,
  63                                  unsigned long long status);
  64 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
  65                                  ext4_lblk_t len);
  66 extern void ext4_es_find_delayed_extent_range(struct inode *inode,
  67                                         ext4_lblk_t lblk, ext4_lblk_t end,
  68                                         struct extent_status *es);
  69 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
  70                                  struct extent_status *es);
  71 extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex);
  72
  73 static inline int ext4_es_is_written(struct extent_status *es)
  74 {
  75         return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;
  76 }
  77
  78 static inline int ext4_es_is_unwritten(struct extent_status *es)
  79 {
  80         return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;
  81 }
  82
  83 static inline int ext4_es_is_delayed(struct extent_status *es)
  84 {
  85         return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;
  86 }
  87
  88 static inline int ext4_es_is_hole(struct extent_status *es)
  89 {
  90         return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;
  91 }
  92
  93 static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
  94 {
  95         return (es->es_pblk & EXTENT_STATUS_FLAGS);
  96 }
  97
  98 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
  99 {
 100         return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
 101 }
 102
 103 static inline void ext4_es_store_pblock(struct extent_status *es,
 104                                         ext4_fsblk_t pb)
 105 {
 106         ext4_fsblk_t block;
 107
 108         block = (pb & ~EXTENT_STATUS_FLAGS) |
 109                 (es->es_pblk & EXTENT_STATUS_FLAGS);
 110         es->es_pblk = block;
 111 }
 112
 113 static inline void ext4_es_store_status(struct extent_status *es,
 114                                         unsigned long long status)
 115 {
 116         ext4_fsblk_t block;
 117
 118         block = (status & EXTENT_STATUS_FLAGS) |
 119                 (es->es_pblk & ~EXTENT_STATUS_FLAGS);
 120         es->es_pblk = block;
 121 }
 122
 123 extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);
 124 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
 125 extern void ext4_es_lru_add(struct inode *inode);
 126 extern void ext4_es_lru_del(struct inode *inode);
 127
 128 #endif /* _EXT4_EXTENTS_STATUS_H */