fs/ext4/extents_status.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  fs/ext4/extents_status.h
   4  *
   5  * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
   6  * Modified by
   7  *      Allison Henderson <achender@linux.vnet.ibm.com>
   8  *      Zheng Liu <wenqing.lz@taobao.com>
   9  *
  10  */
  11
  12 #ifndef _EXT4_EXTENTS_STATUS_H
  13 #define _EXT4_EXTENTS_STATUS_H
  14
  15 /*
  16  * Turn on ES_DEBUG__ to get lots of info about extent status operations.
  17  */
  18 #ifdef ES_DEBUG__
  19 #define es_debug(fmt, ...)      printk(fmt, ##__VA_ARGS__)
  20 #else
  21 #define es_debug(fmt, ...)      no_printk(fmt, ##__VA_ARGS__)
  22 #endif
  23
  24 /*
  25  * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
  26  * checked with old map_block's result.
  27  */
  28 #define ES_AGGRESSIVE_TEST__
  29
  30 /*
  31  * These flags live in the high bits of extent_status.es_pblk
  32  */
  33 enum {
  34         ES_WRITTEN_B,
  35         ES_UNWRITTEN_B,
  36         ES_DELAYED_B,
  37         ES_HOLE_B,
  38         ES_REFERENCED_B,
  39         ES_FLAGS
  40 };
  41
  42 #define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
  43 #define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
  44
  45 #define EXTENT_STATUS_WRITTEN   (1 << ES_WRITTEN_B)
  46 #define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
  47 #define EXTENT_STATUS_DELAYED   (1 << ES_DELAYED_B)
  48 #define EXTENT_STATUS_HOLE      (1 << ES_HOLE_B)
  49 #define EXTENT_STATUS_REFERENCED        (1 << ES_REFERENCED_B)
  50
  51 #define ES_TYPE_MASK    ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
  52                           EXTENT_STATUS_UNWRITTEN | \
  53                           EXTENT_STATUS_DELAYED | \
  54                           EXTENT_STATUS_HOLE) << ES_SHIFT)
  55
  56 struct ext4_sb_info;
  57 struct ext4_extent;
  58
  59 struct extent_status {
  60         struct rb_node rb_node;
  61         ext4_lblk_t es_lblk;    /* first logical block extent covers */
  62         ext4_lblk_t es_len;     /* length of extent in block */
  63         ext4_fsblk_t es_pblk;   /* first physical block */
  64 };
  65
  66 struct ext4_es_tree {
  67         struct rb_root root;
  68         struct extent_status *cache_es; /* recently accessed extent */
  69 };
  70
  71 struct ext4_es_stats {
  72         unsigned long es_stats_shrunk;
  73         unsigned long es_stats_cache_hits;
  74         unsigned long es_stats_cache_misses;
  75         u64 es_stats_scan_time;
  76         u64 es_stats_max_scan_time;
  77         struct percpu_counter es_stats_all_cnt;
  78         struct percpu_counter es_stats_shk_cnt;
  79 };
  80
  81 extern int __init ext4_init_es(void);
  82 extern void ext4_exit_es(void);
  83 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
  84
  85 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
  86                                  ext4_lblk_t len, ext4_fsblk_t pblk,
  87                                  unsigned int status);
  88 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
  89                                  ext4_lblk_t len, ext4_fsblk_t pblk,
  90                                  unsigned int status);
  91 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
  92                                  ext4_lblk_t len);
  93 extern void ext4_es_find_delayed_extent_range(struct inode *inode,
  94                                         ext4_lblk_t lblk, ext4_lblk_t end,
  95                                         struct extent_status *es);
  96 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
  97                                  struct extent_status *es);
  98
  99 static inline unsigned int ext4_es_status(struct extent_status *es)
 100 {
 101         return es->es_pblk >> ES_SHIFT;
 102 }
 103
 104 static inline unsigned int ext4_es_type(struct extent_status *es)
 105 {
 106         return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
 107 }
 108
 109 static inline int ext4_es_is_written(struct extent_status *es)
 110 {
 111         return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
 112 }
 113
 114 static inline int ext4_es_is_unwritten(struct extent_status *es)
 115 {
 116         return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
 117 }
 118
 119 static inline int ext4_es_is_delayed(struct extent_status *es)
 120 {
 121         return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
 122 }
 123
 124 static inline int ext4_es_is_hole(struct extent_status *es)
 125 {
 126         return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
 127 }
 128
 129 static inline void ext4_es_set_referenced(struct extent_status *es)
 130 {
 131         es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
 132 }
 133
 134 static inline void ext4_es_clear_referenced(struct extent_status *es)
 135 {
 136         es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
 137 }
 138
 139 static inline int ext4_es_is_referenced(struct extent_status *es)
 140 {
 141         return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
 142 }
 143
 144 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
 145 {
 146         return es->es_pblk & ~ES_MASK;
 147 }
 148
 149 static inline void ext4_es_store_pblock(struct extent_status *es,
 150                                         ext4_fsblk_t pb)
 151 {
 152         ext4_fsblk_t block;
 153
 154         block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
 155         es->es_pblk = block;
 156 }
 157
 158 static inline void ext4_es_store_status(struct extent_status *es,
 159                                         unsigned int status)
 160 {
 161         es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
 162                       (es->es_pblk & ~ES_MASK);
 163 }
 164
 165 static inline void ext4_es_store_pblock_status(struct extent_status *es,
 166                                                ext4_fsblk_t pb,
 167                                                unsigned int status)
 168 {
 169         es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
 170                       (pb & ~ES_MASK);
 171 }
 172
 173 extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
 174 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
 175
 176 extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
 177
 178 #endif /* _EXT4_EXTENTS_STATUS_H */