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258 lines
8.0 KiB
258 lines
8.0 KiB
// 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 <[email protected]> |
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* Modified by |
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* Allison Henderson <[email protected]> |
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* Zheng Liu <[email protected]> |
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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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