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![Xiu Jianfeng](/assets/img/avatar_default.png)
It seems it was introduced by commit d3f77dfdc7
("blkcg: implement
REQ_CGROUP_PUNT") unintentionally, but the definition does not exist,
remove it.
Link: https://lkml.kernel.org/r/20230812110128.482650-1-xiujianfeng@huaweicloud.com
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Stefan Roesch <shr@devkernel.io>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
375 lines
10 KiB
C
375 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/backing-dev.h
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*
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* low-level device information and state which is propagated up through
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* to high-level code.
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*/
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#ifndef _LINUX_BACKING_DEV_H
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#define _LINUX_BACKING_DEV_H
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/device.h>
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#include <linux/writeback.h>
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#include <linux/backing-dev-defs.h>
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#include <linux/slab.h>
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static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi)
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{
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kref_get(&bdi->refcnt);
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return bdi;
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}
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struct backing_dev_info *bdi_get_by_id(u64 id);
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void bdi_put(struct backing_dev_info *bdi);
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__printf(2, 3)
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int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...);
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__printf(2, 0)
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int bdi_register_va(struct backing_dev_info *bdi, const char *fmt,
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va_list args);
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void bdi_set_owner(struct backing_dev_info *bdi, struct device *owner);
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void bdi_unregister(struct backing_dev_info *bdi);
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struct backing_dev_info *bdi_alloc(int node_id);
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void wb_start_background_writeback(struct bdi_writeback *wb);
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void wb_workfn(struct work_struct *work);
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void wb_wakeup_delayed(struct bdi_writeback *wb);
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void wb_wait_for_completion(struct wb_completion *done);
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extern spinlock_t bdi_lock;
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extern struct list_head bdi_list;
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extern struct workqueue_struct *bdi_wq;
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static inline bool wb_has_dirty_io(struct bdi_writeback *wb)
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{
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return test_bit(WB_has_dirty_io, &wb->state);
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}
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static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi)
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{
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/*
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* @bdi->tot_write_bandwidth is guaranteed to be > 0 if there are
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* any dirty wbs. See wb_update_write_bandwidth().
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*/
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return atomic_long_read(&bdi->tot_write_bandwidth);
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}
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static inline void wb_stat_mod(struct bdi_writeback *wb,
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enum wb_stat_item item, s64 amount)
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{
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percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);
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}
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static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
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{
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wb_stat_mod(wb, item, 1);
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}
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static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
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{
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wb_stat_mod(wb, item, -1);
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}
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static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
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{
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return percpu_counter_read_positive(&wb->stat[item]);
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}
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static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)
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{
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return percpu_counter_sum_positive(&wb->stat[item]);
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}
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extern void wb_writeout_inc(struct bdi_writeback *wb);
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/*
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* maximal error of a stat counter.
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*/
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static inline unsigned long wb_stat_error(void)
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{
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#ifdef CONFIG_SMP
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return nr_cpu_ids * WB_STAT_BATCH;
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#else
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return 1;
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#endif
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}
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/* BDI ratio is expressed as part per 1000000 for finer granularity. */
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#define BDI_RATIO_SCALE 10000
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u64 bdi_get_min_bytes(struct backing_dev_info *bdi);
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u64 bdi_get_max_bytes(struct backing_dev_info *bdi);
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int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio);
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int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
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int bdi_set_min_ratio_no_scale(struct backing_dev_info *bdi, unsigned int min_ratio);
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int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio);
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int bdi_set_min_bytes(struct backing_dev_info *bdi, u64 min_bytes);
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int bdi_set_max_bytes(struct backing_dev_info *bdi, u64 max_bytes);
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int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit);
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/*
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* Flags in backing_dev_info::capability
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*
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* BDI_CAP_WRITEBACK: Supports dirty page writeback, and dirty pages
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* should contribute to accounting
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* BDI_CAP_WRITEBACK_ACCT: Automatically account writeback pages
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* BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold
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*/
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#define BDI_CAP_WRITEBACK (1 << 0)
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#define BDI_CAP_WRITEBACK_ACCT (1 << 1)
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#define BDI_CAP_STRICTLIMIT (1 << 2)
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extern struct backing_dev_info noop_backing_dev_info;
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int bdi_init(struct backing_dev_info *bdi);
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/**
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* writeback_in_progress - determine whether there is writeback in progress
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* @wb: bdi_writeback of interest
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*
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* Determine whether there is writeback waiting to be handled against a
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* bdi_writeback.
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*/
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static inline bool writeback_in_progress(struct bdi_writeback *wb)
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{
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return test_bit(WB_writeback_running, &wb->state);
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}
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struct backing_dev_info *inode_to_bdi(struct inode *inode);
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static inline bool mapping_can_writeback(struct address_space *mapping)
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{
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return inode_to_bdi(mapping->host)->capabilities & BDI_CAP_WRITEBACK;
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}
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#ifdef CONFIG_CGROUP_WRITEBACK
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struct bdi_writeback *wb_get_lookup(struct backing_dev_info *bdi,
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struct cgroup_subsys_state *memcg_css);
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struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi,
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struct cgroup_subsys_state *memcg_css,
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gfp_t gfp);
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void wb_memcg_offline(struct mem_cgroup *memcg);
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void wb_blkcg_offline(struct cgroup_subsys_state *css);
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/**
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* inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode
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* @inode: inode of interest
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*
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* Cgroup writeback requires support from the filesystem. Also, both memcg and
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* iocg have to be on the default hierarchy. Test whether all conditions are
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* met.
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*
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* Note that the test result may change dynamically on the same inode
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* depending on how memcg and iocg are configured.
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*/
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static inline bool inode_cgwb_enabled(struct inode *inode)
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{
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struct backing_dev_info *bdi = inode_to_bdi(inode);
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return cgroup_subsys_on_dfl(memory_cgrp_subsys) &&
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cgroup_subsys_on_dfl(io_cgrp_subsys) &&
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(bdi->capabilities & BDI_CAP_WRITEBACK) &&
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(inode->i_sb->s_iflags & SB_I_CGROUPWB);
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}
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/**
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* wb_find_current - find wb for %current on a bdi
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* @bdi: bdi of interest
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*
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* Find the wb of @bdi which matches both the memcg and blkcg of %current.
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* Must be called under rcu_read_lock() which protects the returend wb.
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* NULL if not found.
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*/
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static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi)
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{
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struct cgroup_subsys_state *memcg_css;
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struct bdi_writeback *wb;
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memcg_css = task_css(current, memory_cgrp_id);
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if (!memcg_css->parent)
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return &bdi->wb;
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wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);
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/*
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* %current's blkcg equals the effective blkcg of its memcg. No
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* need to use the relatively expensive cgroup_get_e_css().
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*/
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if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))
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return wb;
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return NULL;
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}
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/**
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* wb_get_create_current - get or create wb for %current on a bdi
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* @bdi: bdi of interest
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* @gfp: allocation mask
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*
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* Equivalent to wb_get_create() on %current's memcg. This function is
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* called from a relatively hot path and optimizes the common cases using
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* wb_find_current().
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*/
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static inline struct bdi_writeback *
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wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp)
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{
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struct bdi_writeback *wb;
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rcu_read_lock();
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wb = wb_find_current(bdi);
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if (wb && unlikely(!wb_tryget(wb)))
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wb = NULL;
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rcu_read_unlock();
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if (unlikely(!wb)) {
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struct cgroup_subsys_state *memcg_css;
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memcg_css = task_get_css(current, memory_cgrp_id);
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wb = wb_get_create(bdi, memcg_css, gfp);
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css_put(memcg_css);
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}
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return wb;
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}
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/**
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* inode_to_wb - determine the wb of an inode
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* @inode: inode of interest
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*
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* Returns the wb @inode is currently associated with. The caller must be
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* holding either @inode->i_lock, the i_pages lock, or the
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* associated wb's list_lock.
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*/
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static inline struct bdi_writeback *inode_to_wb(const struct inode *inode)
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{
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#ifdef CONFIG_LOCKDEP
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WARN_ON_ONCE(debug_locks &&
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(!lockdep_is_held(&inode->i_lock) &&
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!lockdep_is_held(&inode->i_mapping->i_pages.xa_lock) &&
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!lockdep_is_held(&inode->i_wb->list_lock)));
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#endif
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return inode->i_wb;
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}
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static inline struct bdi_writeback *inode_to_wb_wbc(
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struct inode *inode,
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struct writeback_control *wbc)
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{
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/*
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* If wbc does not have inode attached, it means cgroup writeback was
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* disabled when wbc started. Just use the default wb in that case.
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*/
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return wbc->wb ? wbc->wb : &inode_to_bdi(inode)->wb;
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}
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/**
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* unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction
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* @inode: target inode
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* @cookie: output param, to be passed to the end function
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*
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* The caller wants to access the wb associated with @inode but isn't
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* holding inode->i_lock, the i_pages lock or wb->list_lock. This
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* function determines the wb associated with @inode and ensures that the
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* association doesn't change until the transaction is finished with
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* unlocked_inode_to_wb_end().
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*
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* The caller must call unlocked_inode_to_wb_end() with *@cookie afterwards and
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* can't sleep during the transaction. IRQs may or may not be disabled on
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* return.
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*/
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static inline struct bdi_writeback *
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unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
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{
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rcu_read_lock();
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/*
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* Paired with store_release in inode_switch_wbs_work_fn() and
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* ensures that we see the new wb if we see cleared I_WB_SWITCH.
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*/
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cookie->locked = smp_load_acquire(&inode->i_state) & I_WB_SWITCH;
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if (unlikely(cookie->locked))
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xa_lock_irqsave(&inode->i_mapping->i_pages, cookie->flags);
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/*
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* Protected by either !I_WB_SWITCH + rcu_read_lock() or the i_pages
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* lock. inode_to_wb() will bark. Deref directly.
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*/
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return inode->i_wb;
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}
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/**
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* unlocked_inode_to_wb_end - end inode wb access transaction
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* @inode: target inode
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* @cookie: @cookie from unlocked_inode_to_wb_begin()
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*/
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static inline void unlocked_inode_to_wb_end(struct inode *inode,
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struct wb_lock_cookie *cookie)
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{
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if (unlikely(cookie->locked))
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xa_unlock_irqrestore(&inode->i_mapping->i_pages, cookie->flags);
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rcu_read_unlock();
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}
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#else /* CONFIG_CGROUP_WRITEBACK */
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static inline bool inode_cgwb_enabled(struct inode *inode)
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{
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return false;
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}
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static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi)
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{
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return &bdi->wb;
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}
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static inline struct bdi_writeback *
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wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp)
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{
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return &bdi->wb;
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}
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static inline struct bdi_writeback *inode_to_wb(struct inode *inode)
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{
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return &inode_to_bdi(inode)->wb;
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}
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static inline struct bdi_writeback *inode_to_wb_wbc(
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struct inode *inode,
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struct writeback_control *wbc)
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{
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return inode_to_wb(inode);
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}
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static inline struct bdi_writeback *
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unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
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{
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return inode_to_wb(inode);
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}
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static inline void unlocked_inode_to_wb_end(struct inode *inode,
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struct wb_lock_cookie *cookie)
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{
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}
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static inline void wb_memcg_offline(struct mem_cgroup *memcg)
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{
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}
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static inline void wb_blkcg_offline(struct cgroup_subsys_state *css)
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{
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}
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#endif /* CONFIG_CGROUP_WRITEBACK */
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const char *bdi_dev_name(struct backing_dev_info *bdi);
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#endif /* _LINUX_BACKING_DEV_H */
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