函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\aio.c Create Date:2022-07-29 10:53:21
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：ioctx_add_table

函数原型：static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)

返回类型：int

参数：

类型参数名称
struct kioctx *ctx
struct mm_struct *mm
639  加自旋锁
640  table等于Dependency order vs. p above. (ioctx_table)
642  当1循环
643  如果table则以i小于nr循环
645  如果非cu_access_pointer() - fetch RCU pointer with no dereferencing*@p: The pointer to read* Return the value of the specified RCU-protected pointer, but omit the* lockdep checks for being in an RCU read-side critical section(table[i])则
646  id等于i
647  cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(table[i], ctx)
648  自旋锁解锁
654  ring等于kmap_atomic(ring_pages[0])
655  kernel internal index number 等于id
656  Prevent people trying to call kunmap_atomic() as if it were kunmap()* kunmap_atomic() should get the return value of kmap_atomic, not the page.(ring)
657  返回:0
660  new_nr等于如果table则nr否则1乘4
661  自旋锁解锁
663  table等于分配内存并置零
665  如果非table则返回:负ENOMEM
668  nr等于new_nr
670  加自旋锁
671  old等于Dependency order vs. p above. (ioctx_table)
673  如果非old则
674  cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(ioctx_table, table)
675  否则如果nr大于nr则
676  memcpy(table, table, nr * *的长度)
679  cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(ioctx_table, table)
680  kfree_rcu() - kfree an object after a grace period(old, rcu)
681  否则
682  释放内存
683  table等于old
调用者
名称描述
ioctx_allocx_alloc* Allocates and initializes an ioctx. Returns an ERR_PTR if it failed.