2012-11-08 20:18:54 +00:00
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/*
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* fs/ext4/extents_status.h
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*
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* Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
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* Modified by
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* Allison Henderson <achender@linux.vnet.ibm.com>
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* Zheng Liu <wenqing.lz@taobao.com>
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*
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*/
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#ifndef _EXT4_EXTENTS_STATUS_H
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#define _EXT4_EXTENTS_STATUS_H
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2012-11-09 02:57:20 +00:00
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/*
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* Turn on ES_DEBUG__ to get lots of info about extent status operations.
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*/
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#ifdef ES_DEBUG__
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#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
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#else
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#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
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#endif
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2013-03-11 01:01:03 +00:00
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/*
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* With ES_AGGRESSIVE_TEST defined, the result of es caching will be
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* checked with old map_block's result.
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*/
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#define ES_AGGRESSIVE_TEST__
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2013-02-27 19:54:37 +00:00
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/*
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* These flags live in the high bits of extent_status.es_pblk
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*/
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2014-11-25 16:53:47 +00:00
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enum {
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ES_WRITTEN_B,
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ES_UNWRITTEN_B,
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ES_DELAYED_B,
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ES_HOLE_B,
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ES_FLAGS
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};
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2013-02-18 05:26:51 +00:00
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2014-11-25 16:53:47 +00:00
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#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
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#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
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2013-08-17 01:22:41 +00:00
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2014-11-25 16:53:47 +00:00
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#define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B)
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#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
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#define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B)
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#define EXTENT_STATUS_HOLE (1 << ES_HOLE_B)
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2013-08-17 01:22:41 +00:00
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2013-07-01 12:12:37 +00:00
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struct ext4_sb_info;
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2013-03-11 01:13:05 +00:00
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struct ext4_extent;
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2012-11-08 20:18:54 +00:00
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struct extent_status {
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struct rb_node rb_node;
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2013-02-18 05:26:51 +00:00
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ext4_lblk_t es_lblk; /* first logical block extent covers */
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ext4_lblk_t es_len; /* length of extent in block */
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2013-02-18 05:26:51 +00:00
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ext4_fsblk_t es_pblk; /* first physical block */
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2012-11-08 20:18:54 +00:00
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};
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struct ext4_es_tree {
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struct rb_root root;
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struct extent_status *cache_es; /* recently accessed extent */
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};
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2014-09-02 02:26:49 +00:00
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struct ext4_es_stats {
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unsigned long es_stats_shrunk;
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unsigned long es_stats_cache_hits;
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unsigned long es_stats_cache_misses;
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u64 es_stats_scan_time;
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u64 es_stats_max_scan_time;
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struct percpu_counter es_stats_all_cnt;
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2014-11-25 16:45:37 +00:00
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struct percpu_counter es_stats_shk_cnt;
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2014-09-02 02:26:49 +00:00
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};
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2012-11-09 02:57:20 +00:00
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extern int __init ext4_init_es(void);
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extern void ext4_exit_es(void);
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extern void ext4_es_init_tree(struct ext4_es_tree *tree);
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2013-02-18 05:26:51 +00:00
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extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
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2013-02-18 05:26:51 +00:00
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ext4_lblk_t len, ext4_fsblk_t pblk,
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2013-08-17 01:22:41 +00:00
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unsigned int status);
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2013-08-17 01:23:41 +00:00
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extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t len, ext4_fsblk_t pblk,
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unsigned int status);
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2013-02-18 05:26:51 +00:00
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extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
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2012-11-09 02:57:20 +00:00
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ext4_lblk_t len);
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2013-05-03 06:15:52 +00:00
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extern void ext4_es_find_delayed_extent_range(struct inode *inode,
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ext4_lblk_t lblk, ext4_lblk_t end,
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2013-02-18 05:27:26 +00:00
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struct extent_status *es);
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2013-02-18 05:29:59 +00:00
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extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
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struct extent_status *es);
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2012-11-09 02:57:20 +00:00
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2014-11-25 16:53:47 +00:00
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static inline unsigned int ext4_es_status(struct extent_status *es)
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{
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return es->es_pblk >> ES_SHIFT;
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}
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2013-02-18 05:26:51 +00:00
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static inline int ext4_es_is_written(struct extent_status *es)
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{
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2014-11-25 16:53:47 +00:00
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return (ext4_es_status(es) & EXTENT_STATUS_WRITTEN) != 0;
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2013-02-18 05:26:51 +00:00
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}
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static inline int ext4_es_is_unwritten(struct extent_status *es)
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{
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2014-11-25 16:53:47 +00:00
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return (ext4_es_status(es) & EXTENT_STATUS_UNWRITTEN) != 0;
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2013-02-18 05:26:51 +00:00
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}
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static inline int ext4_es_is_delayed(struct extent_status *es)
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{
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2014-11-25 16:53:47 +00:00
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return (ext4_es_status(es) & EXTENT_STATUS_DELAYED) != 0;
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2013-02-18 05:26:51 +00:00
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}
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static inline int ext4_es_is_hole(struct extent_status *es)
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{
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2014-11-25 16:53:47 +00:00
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return (ext4_es_status(es) & EXTENT_STATUS_HOLE) != 0;
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2013-02-18 05:26:51 +00:00
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}
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static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
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{
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2013-08-17 01:22:41 +00:00
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return es->es_pblk & ~ES_MASK;
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2013-02-18 05:26:51 +00:00
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}
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static inline void ext4_es_store_pblock(struct extent_status *es,
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ext4_fsblk_t pb)
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{
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ext4_fsblk_t block;
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2013-08-17 01:22:41 +00:00
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block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
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2013-02-18 05:26:51 +00:00
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es->es_pblk = block;
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}
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static inline void ext4_es_store_status(struct extent_status *es,
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2013-08-17 01:22:41 +00:00
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unsigned int status)
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2013-02-18 05:26:51 +00:00
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{
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2014-11-25 16:53:47 +00:00
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es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
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(es->es_pblk & ~ES_MASK);
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2013-02-18 05:26:51 +00:00
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}
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2014-02-20 01:15:15 +00:00
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static inline void ext4_es_store_pblock_status(struct extent_status *es,
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ext4_fsblk_t pb,
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unsigned int status)
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{
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2014-11-25 16:53:47 +00:00
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es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
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(pb & ~ES_MASK);
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2014-02-20 01:15:15 +00:00
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}
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2014-09-02 02:26:49 +00:00
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extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
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2013-07-01 12:12:37 +00:00
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extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
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2013-02-18 05:32:55 +00:00
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2012-11-08 20:18:54 +00:00
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#endif /* _EXT4_EXTENTS_STATUS_H */
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