1TRUNCATE_PAGECACHE(9)     Memory Management in Linux     TRUNCATE_PAGECACHE(9)
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NAME

6       truncate_pagecache - unmap and remove pagecache that has been truncated
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SYNOPSIS

9       void truncate_pagecache(struct inode * inode, loff_t newsize);
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ARGUMENTS

12       inode
13           inode
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15       newsize
16           new file size
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DESCRIPTION

19       inode's new i_size must already be written before truncate_pagecache is
20       called.
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22       This function should typically be called before the filesystem releases
23       resources associated with the freed range (eg. deallocates blocks).
24       This way, pagecache will always stay logically coherent with on-disk
25       format, and the filesystem would not have to deal with situations such
26       as writepage being called for a page that has already had its
27       underlying blocks deallocated.
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30Kernel Hackers Manual 3.10         June 2019             TRUNCATE_PAGECACHE(9)
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