函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\iomap\buffered-io.c Create Date:2022-07-29 11:07:28
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：iomap_alloc_ioend

函数原型：static struct iomap_ioend *iomap_alloc_ioend(struct inode *inode, struct iomap_writepage_ctx *wpc, loff_t offset, sector_t sector, struct writeback_control *wbc)

返回类型：struct iomap_ioend

参数：

类型参数名称
struct inode *inode
struct iomap_writepage_ctx *wpc
loff_toffset
sector_tsector
struct writeback_control *wbc
1299  bio等于bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, & iomap_ioend_bioset)
1300  bio_set_dev(bio, block device for I/O )
1301  device address in 512 byte sectors 等于sector
1302  bottom bits req flags, * top bits REQ_OP. Use * accessors.等于REQ_OP_WRITE按位或wbc_to_write_flags(wbc)
1303  bi_write_hint等于i_write_hint
1304  wbc_init_bio(wbc, bio)
1306  ioend等于container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(bio, structiomap_ioend, io_inline_bio)
1307  初始化链表头
1308  io_type等于 type of mapping
1309  IOMAP_F_* 等于 flags for mapping
1310  le being written to 等于inode
1311  size of the extent 等于0
1312  ffset in the file 等于offset
1313  le system private data = NULL
1314  being built 等于bio
1315  返回:ioend
调用者
名称描述
iomap_add_to_ioendTest to see if we have an existing ioend structure that we could append to* first, otherwise finish off the current ioend and start another.