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238 lines
5.9 KiB
238 lines
5.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* fs/ext4/mballoc.h |
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* |
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* Written by: Alex Tomas <[email protected]> |
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* |
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*/ |
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#ifndef _EXT4_MBALLOC_H |
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#define _EXT4_MBALLOC_H |
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#include <linux/time.h> |
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#include <linux/fs.h> |
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#include <linux/namei.h> |
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#include <linux/quotaops.h> |
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#include <linux/buffer_head.h> |
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#include <linux/module.h> |
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#include <linux/swap.h> |
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#include <linux/proc_fs.h> |
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#include <linux/pagemap.h> |
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#include <linux/seq_file.h> |
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#include <linux/blkdev.h> |
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#include <linux/mutex.h> |
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#include "ext4_jbd2.h" |
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#include "ext4.h" |
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/* |
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* mb_debug() dynamic printk msgs could be used to debug mballoc code. |
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*/ |
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#ifdef CONFIG_EXT4_DEBUG |
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#define mb_debug(sb, fmt, ...) \ |
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pr_debug("[%s/%d] EXT4-fs (%s): (%s, %d): %s: " fmt, \ |
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current->comm, task_pid_nr(current), sb->s_id, \ |
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__FILE__, __LINE__, __func__, ##__VA_ARGS__) |
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#else |
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#define mb_debug(sb, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
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#endif |
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#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */ |
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#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */ |
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/* |
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* How long mballoc can look for a best extent (in found extents) |
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*/ |
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#define MB_DEFAULT_MAX_TO_SCAN 200 |
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/* |
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* How long mballoc must look for a best extent |
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*/ |
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#define MB_DEFAULT_MIN_TO_SCAN 10 |
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/* |
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* with 'ext4_mb_stats' allocator will collect stats that will be |
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* shown at umount. The collecting costs though! |
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*/ |
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#define MB_DEFAULT_STATS 0 |
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/* |
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* files smaller than MB_DEFAULT_STREAM_THRESHOLD are served |
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* by the stream allocator, which purpose is to pack requests |
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* as close each to other as possible to produce smooth I/O traffic |
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* We use locality group prealloc space for stream request. |
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* We can tune the same via /proc/fs/ext4/<partition>/stream_req |
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*/ |
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#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */ |
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/* |
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* for which requests use 2^N search using buddies |
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*/ |
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#define MB_DEFAULT_ORDER2_REQS 2 |
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/* |
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* default group prealloc size 512 blocks |
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*/ |
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#define MB_DEFAULT_GROUP_PREALLOC 512 |
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/* |
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* maximum length of inode prealloc list |
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*/ |
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#define MB_DEFAULT_MAX_INODE_PREALLOC 512 |
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/* |
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* Number of groups to search linearly before performing group scanning |
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* optimization. |
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*/ |
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#define MB_DEFAULT_LINEAR_LIMIT 4 |
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/* |
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* Minimum number of groups that should be present in the file system to perform |
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* group scanning optimizations. |
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*/ |
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#define MB_DEFAULT_LINEAR_SCAN_THRESHOLD 16 |
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/* |
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* Number of valid buddy orders |
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*/ |
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#define MB_NUM_ORDERS(sb) ((sb)->s_blocksize_bits + 2) |
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struct ext4_free_data { |
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/* this links the free block information from sb_info */ |
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struct list_head efd_list; |
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/* this links the free block information from group_info */ |
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struct rb_node efd_node; |
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/* group which free block extent belongs */ |
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ext4_group_t efd_group; |
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/* free block extent */ |
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ext4_grpblk_t efd_start_cluster; |
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ext4_grpblk_t efd_count; |
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/* transaction which freed this extent */ |
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tid_t efd_tid; |
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}; |
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struct ext4_prealloc_space { |
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struct list_head pa_inode_list; |
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struct list_head pa_group_list; |
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union { |
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struct list_head pa_tmp_list; |
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struct rcu_head pa_rcu; |
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} u; |
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spinlock_t pa_lock; |
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atomic_t pa_count; |
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unsigned pa_deleted; |
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ext4_fsblk_t pa_pstart; /* phys. block */ |
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ext4_lblk_t pa_lstart; /* log. block */ |
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ext4_grpblk_t pa_len; /* len of preallocated chunk */ |
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ext4_grpblk_t pa_free; /* how many blocks are free */ |
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unsigned short pa_type; /* pa type. inode or group */ |
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spinlock_t *pa_obj_lock; |
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struct inode *pa_inode; /* hack, for history only */ |
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}; |
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enum { |
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MB_INODE_PA = 0, |
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MB_GROUP_PA = 1 |
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}; |
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struct ext4_free_extent { |
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ext4_lblk_t fe_logical; |
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ext4_grpblk_t fe_start; /* In cluster units */ |
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ext4_group_t fe_group; |
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ext4_grpblk_t fe_len; /* In cluster units */ |
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}; |
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/* |
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* Locality group: |
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* we try to group all related changes together |
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* so that writeback can flush/allocate them together as well |
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* Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC |
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* (512). We store prealloc space into the hash based on the pa_free blocks |
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* order value.ie, fls(pa_free)-1; |
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*/ |
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#define PREALLOC_TB_SIZE 10 |
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struct ext4_locality_group { |
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/* for allocator */ |
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/* to serialize allocates */ |
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struct mutex lg_mutex; |
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/* list of preallocations */ |
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struct list_head lg_prealloc_list[PREALLOC_TB_SIZE]; |
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spinlock_t lg_prealloc_lock; |
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}; |
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struct ext4_allocation_context { |
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struct inode *ac_inode; |
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struct super_block *ac_sb; |
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/* original request */ |
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struct ext4_free_extent ac_o_ex; |
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/* goal request (normalized ac_o_ex) */ |
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struct ext4_free_extent ac_g_ex; |
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/* the best found extent */ |
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struct ext4_free_extent ac_b_ex; |
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/* copy of the best found extent taken before preallocation efforts */ |
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struct ext4_free_extent ac_f_ex; |
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ext4_group_t ac_last_optimal_group; |
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__u32 ac_groups_considered; |
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__u32 ac_flags; /* allocation hints */ |
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__u16 ac_groups_scanned; |
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__u16 ac_groups_linear_remaining; |
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__u16 ac_found; |
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__u16 ac_tail; |
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__u16 ac_buddy; |
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__u8 ac_status; |
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__u8 ac_criteria; |
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__u8 ac_2order; /* if request is to allocate 2^N blocks and |
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* N > 0, the field stores N, otherwise 0 */ |
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__u8 ac_op; /* operation, for history only */ |
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struct page *ac_bitmap_page; |
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struct page *ac_buddy_page; |
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struct ext4_prealloc_space *ac_pa; |
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struct ext4_locality_group *ac_lg; |
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}; |
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#define AC_STATUS_CONTINUE 1 |
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#define AC_STATUS_FOUND 2 |
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#define AC_STATUS_BREAK 3 |
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struct ext4_buddy { |
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struct page *bd_buddy_page; |
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void *bd_buddy; |
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struct page *bd_bitmap_page; |
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void *bd_bitmap; |
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struct ext4_group_info *bd_info; |
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struct super_block *bd_sb; |
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__u16 bd_blkbits; |
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ext4_group_t bd_group; |
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}; |
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static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb, |
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struct ext4_free_extent *fex) |
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{ |
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return ext4_group_first_block_no(sb, fex->fe_group) + |
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(fex->fe_start << EXT4_SB(sb)->s_cluster_bits); |
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} |
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typedef int (*ext4_mballoc_query_range_fn)( |
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struct super_block *sb, |
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ext4_group_t agno, |
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ext4_grpblk_t start, |
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ext4_grpblk_t len, |
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void *priv); |
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int |
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ext4_mballoc_query_range( |
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struct super_block *sb, |
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ext4_group_t agno, |
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ext4_grpblk_t start, |
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ext4_grpblk_t end, |
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ext4_mballoc_query_range_fn formatter, |
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void *priv); |
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#endif
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