函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\iomap\swapfile.c Create Date:2022-07-29 11:08:09
Last Modify:2020-03-18 11:03:10 Copyright©Brick
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函数名称：Accumulate iomaps for this swap file. We have to accumulate iomaps because* swap only cares about contiguous page-aligned physical extents and makes no* distinction between written and unwritten extents.

函数原型：static loff_t iomap_swapfile_activate_actor(struct inode *inode, loff_t pos, loff_t count, void *data, struct iomap *iomap, struct iomap *srcmap)

返回类型：loff_t

参数：

类型参数名称
struct inode *inode
loff_tpos
loff_tcount
void *data
struct iomap *iomap
struct iomap *srcmap
82  isi等于data
86  当: type of mapping 恒等于locks allocated at @addr
87  当: type of mapping 恒等于locks allocated at @addr in unwritten state
89  退出
90  当: type of mapping 恒等于data inline in the inode
92  打印错误信息("swapon: file is inline\n")
93  返回:负EINVAL
94  默认
95  打印错误信息("swapon: file has unallocated extents\n")
96  返回:负EINVAL
100  如果 flags for mapping 按位与IOMAP_F_DIRTY则
101  打印错误信息("swapon: file is not committed\n")
102  返回:负EINVAL
104  如果 flags for mapping 按位与IOMAP_F_SHARED则
105  打印错误信息("swapon: file has shared extents\n")
106  返回:负EINVAL
110  如果 block device for I/O 不等于swap device or bdev of swap file 则
111  打印错误信息("swapon: file is on multiple devices\n")
112  返回:负EINVAL
115  如果 length of mapping, bytes 恒等于0则
117  memcpy( & accumulated iomap , iomap, accumulated iomap 的长度)
118  否则如果 disk offset of mapping, bytes 加 length of mapping, bytes 恒等于 disk offset of mapping, bytes 则
120  length of mapping, bytes 加等于 length of mapping, bytes
121  否则
123  error等于Collect physical extents for this swap file. Physical extents reported to* the swap code must be trimmed to align to a page boundary. The logical* offset within the file is irrelevant since the swapfile code maps logical
124  如果error则返回:error
126  memcpy( & accumulated iomap , iomap, accumulated iomap 的长度)
128  返回:count