// SPDX-License-Identifier: GPL-2.0 /* * fs/ext4/mballoc.h * * Written by: Alex Tomas <[email protected]> * */ #ifndef _EXT4_MBALLOC_H #define _EXT4_MBALLOC_H #include <linux/time.h> #include <linux/fs.h> #include <linux/namei.h> #include <linux/quotaops.h> #include <linux/buffer_head.h> #include <linux/module.h> #include <linux/swap.h> #include <linux/proc_fs.h> #include <linux/pagemap.h> #include <linux/seq_file.h> #include <linux/blkdev.h> #include <linux/mutex.h> #include "ext4_jbd2.h" #include "ext4.h" /* * mb_debug() dynamic printk msgs could be used to debug mballoc code. */ #ifdef CONFIG_EXT4_DEBUG #define mb_debug(sb, fmt, ...) … #else #define mb_debug … #endif #define EXT4_MB_HISTORY_ALLOC … #define EXT4_MB_HISTORY_PREALLOC … /* * How long mballoc can look for a best extent (in found extents) */ #define MB_DEFAULT_MAX_TO_SCAN … /* * How long mballoc must look for a best extent */ #define MB_DEFAULT_MIN_TO_SCAN … /* * with 's_mb_stats' allocator will collect stats that will be * shown at umount. The collecting costs though! */ #define MB_DEFAULT_STATS … /* * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served * by the stream allocator, which purpose is to pack requests * as close each to other as possible to produce smooth I/O traffic * We use locality group prealloc space for stream request. * We can tune the same via /proc/fs/ext4/<partition>/stream_req */ #define MB_DEFAULT_STREAM_THRESHOLD … /* * for which requests use 2^N search using buddies */ #define MB_DEFAULT_ORDER2_REQS … /* * default group prealloc size 512 blocks */ #define MB_DEFAULT_GROUP_PREALLOC … /* * Number of groups to search linearly before performing group scanning * optimization. */ #define MB_DEFAULT_LINEAR_LIMIT … /* * Minimum number of groups that should be present in the file system to perform * group scanning optimizations. */ #define MB_DEFAULT_LINEAR_SCAN_THRESHOLD … /* * The maximum order upto which CR_BEST_AVAIL_LEN can trim a particular * allocation request. Example, if we have an order 7 request and max trim order * of 3, we can trim this request upto order 4. */ #define MB_DEFAULT_BEST_AVAIL_TRIM_ORDER … /* * Number of valid buddy orders */ #define MB_NUM_ORDERS(sb) … struct ext4_free_data { … }; struct ext4_prealloc_space { … }; enum { … }; struct ext4_free_extent { … }; /* * Locality group: * we try to group all related changes together * so that writeback can flush/allocate them together as well * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC * (512). We store prealloc space into the hash based on the pa_free blocks * order value.ie, fls(pa_free)-1; */ #define PREALLOC_TB_SIZE … struct ext4_locality_group { … }; struct ext4_allocation_context { … }; #define AC_STATUS_CONTINUE … #define AC_STATUS_FOUND … #define AC_STATUS_BREAK … struct ext4_buddy { … }; static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb, struct ext4_free_extent *fex) { … } static inline loff_t extent_logical_end(struct ext4_sb_info *sbi, struct ext4_free_extent *fex) { … } static inline loff_t pa_logical_end(struct ext4_sb_info *sbi, struct ext4_prealloc_space *pa) { … } ext4_mballoc_query_range_fn; int ext4_mballoc_query_range( struct super_block *sb, ext4_group_t agno, ext4_grpblk_t start, ext4_grpblk_t end, ext4_mballoc_query_range_fn formatter, void *priv); #endif
Codebase Browser
linux