fscrypt_decrypt_pagecache

Name:scrypt_decrypt_pagecache_blocks() - Decrypt filesystem blocks in a pagecache page*@page: The locked pagecache page containing the block(s) to decrypt*@len: Total size of the block(s) to decrypt. Must be a nonzero* multiple of the filesystem's block size.

Proto:int fscrypt_decrypt_pagecache_blocks(struct page *page, unsigned int len, unsigned int offs)

Type:int

Parameter:

Type	Parameter	Name
struct page *	page
unsigned int	len
unsigned int	offs

240

inode = host

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blockbits = i_blkbits

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blocksize = 1 << blockbits

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lblk_num = ( Our offset within mapping. << PAGE_SHIFT determines the page size - blockbits ) + (offs >> blockbits)

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If WARN_ON_ONCE(!PageLocked(page)) Then Return -EINVAL

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If WARN_ON_ONCE(len <= 0 || !IS_ALIGNED(len | offs, blocksize)) Then Return -EINVAL

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When i < offs + len cycle

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err = Encrypt or decrypt a single filesystem block of file contents

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If err Then Return err

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Return 0

**Caller**
Name	Describe
fscrypt_decrypt_bio

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion

Function report