/* * fs/f2fs/gc.h * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define GC_THREAD_MIN_WB_PAGES 1 /* * a threshold to determine * whether IO subsystem is idle * or not */ #define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */ #define DEF_GC_THREAD_MAX_SLEEP_TIME 60000 #define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */ #define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */ #define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */ /* Search max. number of dirty segments to select a victim segment */ #define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */ struct f2fs_gc_kthread { struct task_struct *f2fs_gc_task; wait_queue_head_t gc_wait_queue_head; /* for gc sleep time */ unsigned int min_sleep_time; unsigned int max_sleep_time; unsigned int no_gc_sleep_time; /* for changing gc mode */ unsigned int gc_idle; }; struct gc_inode_list { struct list_head ilist; struct radix_tree_root iroot; }; /* * inline functions */ static inline block_t free_user_blocks(struct f2fs_sb_info *sbi) { if (free_segments(sbi) < overprovision_segments(sbi)) return 0; else return (free_segments(sbi) - overprovision_segments(sbi)) << sbi->log_blocks_per_seg; } static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi) { return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100; } static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi) { block_t reclaimable_user_blocks = sbi->user_block_count - written_block_count(sbi); return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100; } static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th, long *wait) { if (*wait == gc_th->no_gc_sleep_time) return; *wait += gc_th->min_sleep_time; if (*wait > gc_th->max_sleep_time) *wait = gc_th->max_sleep_time; } static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th, long *wait) { if (*wait == gc_th->no_gc_sleep_time) *wait = gc_th->max_sleep_time; *wait -= gc_th->min_sleep_time; if (*wait <= gc_th->min_sleep_time) *wait = gc_th->min_sleep_time; } static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi) { block_t invalid_user_blocks = sbi->user_block_count - written_block_count(sbi); /* * Background GC is triggered with the following conditions. * 1. There are a number of invalid blocks. * 2. There is not enough free space. */ if (invalid_user_blocks > limit_invalid_user_blocks(sbi) && free_user_blocks(sbi) < limit_free_user_blocks(sbi)) return true; return false; } ae1825bdbafc701965442a47739ff0ad&showmsg=1'>root/include/net/caif/caif_spi.h
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