函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\power\swap.c Create Date:2022-07-27 11:02:27
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：get_swap_writer

函数原型：static int get_swap_writer(struct swap_map_handle *handle)

返回类型：int

参数：

类型参数名称
struct swap_map_handle *handle
413  ret等于swsusp_swap_check - check if the resume device is a swap device* and get its index (if so)* This is called before saving image
414  如果ret则
415  如果ret不等于负ENOSPC则打印错误信息("Cannot find swap device, try swapon -a\n")
417  返回:ret
419  cur等于get_zeroed_page(GFP_KERNEL)
420  如果非cur则
421  ret等于负ENOMEM
422  转到:err_close
424  cur_swap等于alloc_swapdev_block - allocate a swap page and register that it has* been allocated, so that it can be freed in case of an error.
425  如果非cur_swap则
426  ret等于负ENOSPC
427  转到:err_rel
429  k等于0
430  reqd_free_pages等于Number of pages required to be kept free while writing the image. Always* half of all available low pages before the writing starts.
431  first_sector等于cur_swap
432  返回:0
433  err_rel :
434  release_swap_writer(handle)
435  err_close :
436  swsusp_close - close swap device.
437  返回:ret
调用者
名称描述
swsusp_writeswsusp_write - Write entire image and metadata.*@flags: flags to pass to the "boot" kernel in the image header* It is important _NOT_ to umount filesystems at this point. We want* them synced (in case something goes wrong) but we DO not want to mark