259 lines
8.0 KiB
C
259 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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/*
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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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/*
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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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/*
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* These flags live in the high bits of extent_status.es_pblk
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*/
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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_REFERENCED_B,
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ES_FLAGS
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};
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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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#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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#define EXTENT_STATUS_REFERENCED (1 << ES_REFERENCED_B)
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#define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
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EXTENT_STATUS_UNWRITTEN | \
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EXTENT_STATUS_DELAYED | \
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EXTENT_STATUS_HOLE) << ES_SHIFT)
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struct ext4_sb_info;
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struct ext4_extent;
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struct extent_status {
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struct rb_node rb_node;
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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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ext4_fsblk_t es_pblk; /* first physical block */
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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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struct ext4_es_stats {
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unsigned long es_stats_shrunk;
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struct percpu_counter es_stats_cache_hits;
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struct percpu_counter 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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struct percpu_counter es_stats_shk_cnt;
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};
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/*
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* Pending cluster reservations for bigalloc file systems
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*
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* A cluster with a pending reservation is a logical cluster shared by at
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* least one extent in the extents status tree with delayed and unwritten
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* status and at least one other written or unwritten extent. The
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* reservation is said to be pending because a cluster reservation would
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* have to be taken in the event all blocks in the cluster shared with
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* written or unwritten extents were deleted while the delayed and
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* unwritten blocks remained.
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*
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* The set of pending cluster reservations is an auxiliary data structure
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* used with the extents status tree to implement reserved cluster/block
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* accounting for bigalloc file systems. The set is kept in memory and
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* records all pending cluster reservations.
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*
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* Its primary function is to avoid the need to read extents from the
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* disk when invalidating pages as a result of a truncate, punch hole, or
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* collapse range operation. Page invalidation requires a decrease in the
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* reserved cluster count if it results in the removal of all delayed
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* and unwritten extents (blocks) from a cluster that is not shared with a
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* written or unwritten extent, and no decrease otherwise. Determining
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* whether the cluster is shared can be done by searching for a pending
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* reservation on it.
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*
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* Secondarily, it provides a potentially faster method for determining
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* whether the reserved cluster count should be increased when a physical
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* cluster is deallocated as a result of a truncate, punch hole, or
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* collapse range operation. The necessary information is also present
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* in the extents status tree, but might be more rapidly accessed in
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* the pending reservation set in many cases due to smaller size.
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*
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* The pending cluster reservation set is implemented as a red-black tree
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* with the goal of minimizing per page search time overhead.
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*/
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struct pending_reservation {
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struct rb_node rb_node;
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ext4_lblk_t lclu;
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};
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struct ext4_pending_tree {
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struct rb_root root;
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};
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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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extern int ext4_es_insert_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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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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extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t len);
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extern void ext4_es_find_extent_range(struct inode *inode,
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int (*match_fn)(struct extent_status *es),
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ext4_lblk_t lblk, ext4_lblk_t end,
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struct extent_status *es);
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extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t *next_lblk,
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struct extent_status *es);
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extern bool ext4_es_scan_range(struct inode *inode,
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int (*matching_fn)(struct extent_status *es),
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ext4_lblk_t lblk, ext4_lblk_t end);
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extern bool ext4_es_scan_clu(struct inode *inode,
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int (*matching_fn)(struct extent_status *es),
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ext4_lblk_t lblk);
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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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static inline unsigned int ext4_es_type(struct extent_status *es)
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{
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return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
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}
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static inline int ext4_es_is_written(struct extent_status *es)
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{
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return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
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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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return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
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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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return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
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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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return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
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}
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static inline int ext4_es_is_mapped(struct extent_status *es)
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{
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return (ext4_es_is_written(es) || ext4_es_is_unwritten(es));
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}
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static inline int ext4_es_is_delonly(struct extent_status *es)
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{
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return (ext4_es_is_delayed(es) && !ext4_es_is_unwritten(es));
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}
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static inline void ext4_es_set_referenced(struct extent_status *es)
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{
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es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
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}
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static inline void ext4_es_clear_referenced(struct extent_status *es)
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{
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es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
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}
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static inline int ext4_es_is_referenced(struct extent_status *es)
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{
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return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
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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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return es->es_pblk & ~ES_MASK;
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}
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static inline ext4_fsblk_t ext4_es_show_pblock(struct extent_status *es)
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{
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ext4_fsblk_t pblock = ext4_es_pblock(es);
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return pblock == ~ES_MASK ? 0 : pblock;
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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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block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
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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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unsigned int status)
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{
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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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}
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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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es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
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(pb & ~ES_MASK);
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}
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extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
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extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
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extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
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extern int __init ext4_init_pending(void);
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extern void ext4_exit_pending(void);
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extern void ext4_init_pending_tree(struct ext4_pending_tree *tree);
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extern void ext4_remove_pending(struct inode *inode, ext4_lblk_t lblk);
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extern bool ext4_is_pending(struct inode *inode, ext4_lblk_t lblk);
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extern int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
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bool allocated);
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extern unsigned int ext4_es_delayed_clu(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t len);
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extern void ext4_clear_inode_es(struct inode *inode);
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#endif /* _EXT4_EXTENTS_STATUS_H */
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