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/* SPDX-License-Identifier: GPL-2.0 */
/*
* include/linux/backing-dev.h
*
* low-level device information and state which is propagated up through
* to high-level code.
*/
#ifndef _LINUX_BACKING_DEV_H
#define _LINUX_BACKING_DEV_H
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/writeback.h>
#include <linux/blk-cgroup.h>
#include <linux/backing-dev-defs.h>
#include <linux/slab.h>
static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi)
{
kref_get(&bdi->refcnt);
return bdi;
}
struct backing_dev_info *bdi_get_by_id(u64 id);
void bdi_put(struct backing_dev_info *bdi);
__printf(2, 3)
int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...);
__printf(2, 0)
int bdi_register_va(struct backing_dev_info *bdi, const char *fmt,
va_list args);
void bdi_set_owner(struct backing_dev_info *bdi, struct device *owner);
void bdi_unregister(struct backing_dev_info *bdi);
struct backing_dev_info *bdi_alloc(int node_id);
void wb_start_background_writeback(struct bdi_writeback *wb);
void wb_workfn(struct work_struct *work);
void wb_wakeup_delayed(struct bdi_writeback *wb);
void wb_wait_for_completion(struct wb_completion *done);
extern spinlock_t bdi_lock;
extern struct list_head bdi_list;
extern struct workqueue_struct *bdi_wq;
extern struct workqueue_struct *bdi_async_bio_wq;
static inline bool wb_has_dirty_io(struct bdi_writeback *wb)
{
return test_bit(WB_has_dirty_io, &wb->state);
}
static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi)
{
/*
* @bdi->tot_write_bandwidth is guaranteed to be > 0 if there are
* any dirty wbs. See wb_update_write_bandwidth().
*/
return atomic_long_read(&bdi->tot_write_bandwidth);
}
static inline void __add_wb_stat(struct bdi_writeback *wb,
enum wb_stat_item item, s64 amount)
{
percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);
}
static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
{
__add_wb_stat(wb, item, 1);
}
static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
{
__add_wb_stat(wb, item, -1);
}
static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
{
return percpu_counter_read_positive(&wb->stat[item]);
}
static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)
{
return percpu_counter_sum_positive(&wb->stat[item]);
}
extern void wb_writeout_inc(struct bdi_writeback *wb);
/*
* maximal error of a stat counter.
*/
static inline unsigned long wb_stat_error(void)
{
#ifdef CONFIG_SMP
return nr_cpu_ids * WB_STAT_BATCH;
#else
return 1;
#endif
}
int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio);
int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
/*
* Flags in backing_dev_info::capability
*
* BDI_CAP_WRITEBACK: Supports dirty page writeback, and dirty pages
* should contribute to accounting
* BDI_CAP_WRITEBACK_ACCT: Automatically account writeback pages
* BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold
*/
#define BDI_CAP_WRITEBACK (1 << 0)
#define BDI_CAP_WRITEBACK_ACCT (1 << 1)
#define BDI_CAP_STRICTLIMIT (1 << 2)
extern struct backing_dev_info noop_backing_dev_info;
/**
* writeback_in_progress - determine whether there is writeback in progress
* @wb: bdi_writeback of interest
*
* Determine whether there is writeback waiting to be handled against a
* bdi_writeback.
*/
static inline bool writeback_in_progress(struct bdi_writeback *wb)
{
return test_bit(WB_writeback_running, &wb->state);
}
static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
{
struct super_block *sb;
if (!inode)
return &noop_backing_dev_info;
sb = inode->i_sb;
#ifdef CONFIG_BLOCK
if (sb_is_blkdev_sb(sb))
return I_BDEV(inode)->bd_bdi;
#endif
return sb->s_bdi;
}
static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)
{
return wb->congested & cong_bits;
}
long congestion_wait(int sync, long timeout);
long wait_iff_congested(int sync, long timeout);
static inline bool mapping_can_writeback(struct address_space *mapping)
{
return inode_to_bdi(mapping->host)->capabilities & BDI_CAP_WRITEBACK;
}
static inline int bdi_sched_wait(void *word)
{
schedule();
return 0;
}
#ifdef CONFIG_CGROUP_WRITEBACK
struct bdi_writeback *wb_get_lookup(struct backing_dev_info *bdi,
struct cgroup_subsys_state *memcg_css);
struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi,
struct cgroup_subsys_state *memcg_css,
gfp_t gfp);
void wb_memcg_offline(struct mem_cgroup *memcg);
void wb_blkcg_offline(struct blkcg *blkcg);
int inode_congested(struct inode *inode, int cong_bits);
/**
* inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode
* @inode: inode of interest
*
* Cgroup writeback requires support from the filesystem. Also, both memcg and
* iocg have to be on the default hierarchy. Test whether all conditions are
* met.
*
* Note that the test result may change dynamically on the same inode
* depending on how memcg and iocg are configured.
*/
static inline bool inode_cgwb_enabled(struct inode *inode)
{
struct backing_dev_info *bdi = inode_to_bdi(inode);
return cgroup_subsys_on_dfl(memory_cgrp_subsys) &&
cgroup_subsys_on_dfl(io_cgrp_subsys) &&
(bdi->capabilities & BDI_CAP_WRITEBACK) &&
(inode->i_sb->s_iflags & SB_I_CGROUPWB);
}
/**
* wb_find_current - find wb for %current on a bdi
* @bdi: bdi of interest
*
* Find the wb of @bdi which matches both the memcg and blkcg of %current.
* Must be called under rcu_read_lock() which protects the returend wb.
* NULL if not found.
*/
static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi)
{
struct cgroup_subsys_state *memcg_css;
struct bdi_writeback *wb;
memcg_css = task_css(current, memory_cgrp_id);
if (!memcg_css->parent)
return &bdi->wb;
wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);
/*
* %current's blkcg equals the effective blkcg of its memcg. No
* need to use the relatively expensive cgroup_get_e_css().
*/
if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))
return wb;
return NULL;
}
/**
* wb_get_create_current - get or create wb for %current on a bdi
* @bdi: bdi of interest
* @gfp: allocation mask
*
* Equivalent to wb_get_create() on %current's memcg. This function is
* called from a relatively hot path and optimizes the common cases using
* wb_find_current().
*/
static inline struct bdi_writeback *
wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp)
{
struct bdi_writeback *wb;
rcu_read_lock();
wb = wb_find_current(bdi);
if (wb && unlikely(!wb_tryget(wb)))
wb = NULL;
rcu_read_unlock();
if (unlikely(!wb)) {
struct cgroup_subsys_state *memcg_css;
memcg_css = task_get_css(current, memory_cgrp_id);
wb = wb_get_create(bdi, memcg_css, gfp);
css_put(memcg_css);
}
return wb;
}
/**
* inode_to_wb_is_valid - test whether an inode has a wb associated
* @inode: inode of interest
*
* Returns %true if @inode has a wb associated. May be called without any
* locking.
*/
static inline bool inode_to_wb_is_valid(struct inode *inode)
{
return inode->i_wb;
}
/**
* inode_to_wb - determine the wb of an inode
* @inode: inode of interest
*
* Returns the wb @inode is currently associated with. The caller must be
* holding either @inode->i_lock, the i_pages lock, or the
* associated wb's list_lock.
*/
static inline struct bdi_writeback *inode_to_wb(const struct inode *inode)
{
#ifdef CONFIG_LOCKDEP
WARN_ON_ONCE(debug_locks &&
(!lockdep_is_held(&inode->i_lock) &&
!lockdep_is_held(&inode->i_mapping->i_pages.xa_lock) &&
!lockdep_is_held(&inode->i_wb->list_lock)));
#endif
return inode->i_wb;
}
/**
* unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction
* @inode: target inode
* @cookie: output param, to be passed to the end function
*
* The caller wants to access the wb associated with @inode but isn't
* holding inode->i_lock, the i_pages lock or wb->list_lock. This
* function determines the wb associated with @inode and ensures that the
* association doesn't change until the transaction is finished with
* unlocked_inode_to_wb_end().
*
* The caller must call unlocked_inode_to_wb_end() with *@cookie afterwards and
* can't sleep during the transaction. IRQs may or may not be disabled on
* return.
*/
static inline struct bdi_writeback *
unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
{
rcu_read_lock();
/*
* Paired with store_release in inode_switch_wbs_work_fn() and
* ensures that we see the new wb if we see cleared I_WB_SWITCH.
*/
cookie->locked = smp_load_acquire(&inode->i_state) & I_WB_SWITCH;
if (unlikely(cookie->locked))
xa_lock_irqsave(&inode->i_mapping->i_pages, cookie->flags);
/*
* Protected by either !I_WB_SWITCH + rcu_read_lock() or the i_pages
* lock. inode_to_wb() will bark. Deref directly.
*/
return inode->i_wb;
}
/**
* unlocked_inode_to_wb_end - end inode wb access transaction
* @inode: target inode
* @cookie: @cookie from unlocked_inode_to_wb_begin()
*/
static inline void unlocked_inode_to_wb_end(struct inode *inode,
struct wb_lock_cookie *cookie)
{
if (unlikely(cookie->locked))
xa_unlock_irqrestore(&inode->i_mapping->i_pages, cookie->flags);
rcu_read_unlock();
}
#else /* CONFIG_CGROUP_WRITEBACK */
static inline bool inode_cgwb_enabled(struct inode *inode)
{
return false;
}
static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi)
{
return &bdi->wb;
}
static inline struct bdi_writeback *
wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp)
{
return &bdi->wb;
}
static inline bool inode_to_wb_is_valid(struct inode *inode)
{
return true;
}
static inline struct bdi_writeback *inode_to_wb(struct inode *inode)
{
return &inode_to_bdi(inode)->wb;
}
static inline struct bdi_writeback *
unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
{
return inode_to_wb(inode);
}
static inline void unlocked_inode_to_wb_end(struct inode *inode,
struct wb_lock_cookie *cookie)
{
}
static inline void wb_memcg_offline(struct mem_cgroup *memcg)
{
}
static inline void wb_blkcg_offline(struct blkcg *blkcg)
{
}
static inline int inode_congested(struct inode *inode, int cong_bits)
{
return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);
}
#endif /* CONFIG_CGROUP_WRITEBACK */
static inline int inode_read_congested(struct inode *inode)
{
return inode_congested(inode, 1 << WB_sync_congested);
}
static inline int inode_write_congested(struct inode *inode)
{
return inode_congested(inode, 1 << WB_async_congested);
}
static inline int inode_rw_congested(struct inode *inode)
{
return inode_congested(inode, (1 << WB_sync_congested) |
(1 << WB_async_congested));
}
static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
{
return wb_congested(&bdi->wb, cong_bits);
}
static inline int bdi_read_congested(struct backing_dev_info *bdi)
{
return bdi_congested(bdi, 1 << WB_sync_congested);
}
static inline int bdi_write_congested(struct backing_dev_info *bdi)
{
return bdi_congested(bdi, 1 << WB_async_congested);
}
static inline int bdi_rw_congested(struct backing_dev_info *bdi)
{
return bdi_congested(bdi, (1 << WB_sync_congested) |
(1 << WB_async_congested));
}
const char *bdi_dev_name(struct backing_dev_info *bdi);
#endif /* _LINUX_BACKING_DEV_H */
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