From bedbef8ad3e75a304af6361af235302bcc61d06b Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 14 May 2024 06:39:01 +0000
Subject: [PATCH] 修改内核路径
---
kernel/include/linux/backing-dev.h | 116 +++++++++++----------------------------------------------
1 files changed, 23 insertions(+), 93 deletions(-)
diff --git a/kernel/include/linux/backing-dev.h b/kernel/include/linux/backing-dev.h
index d28d57e..44df4fc 100644
--- a/kernel/include/linux/backing-dev.h
+++ b/kernel/include/linux/backing-dev.h
@@ -25,6 +25,7 @@
return bdi;
}
+struct backing_dev_info *bdi_get_by_id(u64 id);
void bdi_put(struct backing_dev_info *bdi);
__printf(2, 3)
@@ -32,23 +33,22 @@
__printf(2, 0)
int bdi_register_va(struct backing_dev_info *bdi, const char *fmt,
va_list args);
-int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner);
+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_node(gfp_t gfp_mask, int node_id);
-static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask)
-{
- return bdi_alloc_node(gfp_mask, NUMA_NO_NODE);
-}
+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)
{
@@ -110,33 +110,14 @@
/*
* Flags in backing_dev_info::capability
*
- * The first three flags control whether dirty pages will contribute to the
- * VM's accounting and whether writepages() should be called for dirty pages
- * (something that would not, for example, be appropriate for ramfs)
- *
- * WARNING: these flags are closely related and should not normally be
- * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these
- * three flags into a single convenience macro.
- *
- * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting
- * BDI_CAP_NO_WRITEBACK: Don't write pages back
- * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages
- * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold.
- *
- * BDI_CAP_CGROUP_WRITEBACK: Supports cgroup-aware writeback.
- * BDI_CAP_SYNCHRONOUS_IO: Device is so fast that asynchronous IO would be
- * inefficient.
+ * 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_NO_ACCT_DIRTY 0x00000001
-#define BDI_CAP_NO_WRITEBACK 0x00000002
-#define BDI_CAP_NO_ACCT_WB 0x00000004
-#define BDI_CAP_STABLE_WRITES 0x00000008
-#define BDI_CAP_STRICTLIMIT 0x00000010
-#define BDI_CAP_CGROUP_WRITEBACK 0x00000020
-#define BDI_CAP_SYNCHRONOUS_IO 0x00000040
-
-#define BDI_CAP_NO_ACCT_AND_WRITEBACK \
- (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB)
+#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;
@@ -169,51 +150,15 @@
static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)
{
- struct backing_dev_info *bdi = wb->bdi;
-
- if (bdi->congested_fn)
- return bdi->congested_fn(bdi->congested_data, cong_bits);
- return wb->congested->state & 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 bdi_cap_synchronous_io(struct backing_dev_info *bdi)
+static inline bool mapping_can_writeback(struct address_space *mapping)
{
- return bdi->capabilities & BDI_CAP_SYNCHRONOUS_IO;
-}
-
-static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi)
-{
- return bdi->capabilities & BDI_CAP_STABLE_WRITES;
-}
-
-static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi)
-{
- return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK);
-}
-
-static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi)
-{
- return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY);
-}
-
-static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi)
-{
- /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */
- return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB |
- BDI_CAP_NO_WRITEBACK));
-}
-
-static inline bool mapping_cap_writeback_dirty(struct address_space *mapping)
-{
- return bdi_cap_writeback_dirty(inode_to_bdi(mapping->host));
-}
-
-static inline bool mapping_cap_account_dirty(struct address_space *mapping)
-{
- return bdi_cap_account_dirty(inode_to_bdi(mapping->host));
+ return inode_to_bdi(mapping->host)->capabilities & BDI_CAP_WRITEBACK;
}
static inline int bdi_sched_wait(void *word)
@@ -224,9 +169,8 @@
#ifdef CONFIG_CGROUP_WRITEBACK
-struct bdi_writeback_congested *
-wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp);
-void wb_congested_put(struct bdi_writeback_congested *congested);
+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);
@@ -238,9 +182,9 @@
* inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode
* @inode: inode of interest
*
- * cgroup writeback requires support from both the bdi and filesystem.
- * Also, both memcg and iocg have to be on the default hierarchy. Test
- * whether all conditions are met.
+ * 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.
@@ -251,8 +195,7 @@
return cgroup_subsys_on_dfl(memory_cgrp_subsys) &&
cgroup_subsys_on_dfl(io_cgrp_subsys) &&
- bdi_cap_account_dirty(bdi) &&
- (bdi->capabilities & BDI_CAP_CGROUP_WRITEBACK) &&
+ (bdi->capabilities & BDI_CAP_WRITEBACK) &&
(inode->i_sb->s_iflags & SB_I_CGROUPWB);
}
@@ -366,7 +309,7 @@
rcu_read_lock();
/*
- * Paired with store_release in inode_switch_wb_work_fn() and
+ * 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;
@@ -400,19 +343,6 @@
static inline bool inode_cgwb_enabled(struct inode *inode)
{
return false;
-}
-
-static inline struct bdi_writeback_congested *
-wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp)
-{
- refcount_inc(&bdi->wb_congested->refcnt);
- return bdi->wb_congested;
-}
-
-static inline void wb_congested_put(struct bdi_writeback_congested *congested)
-{
- if (refcount_dec_and_test(&congested->refcnt))
- kfree(congested);
}
static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi)
--
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