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 oldsize,
10                               loff_t newsize);
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ARGUMENTS

13       inode
14           inode
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16       oldsize
17           old file size
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19       newsize
20           new file size
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DESCRIPTION

23       inode´s new i_size must already be written before truncate_pagecache is
24       called.
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26       This function should typically be called before the filesystem releases
27       resources associated with the freed range (eg. deallocates blocks).
28       This way, pagecache will always stay logically coherent with on-disk
29       format, and the filesystem would not have to deal with situations such
30       as writepage being called for a page that has already had its
31       underlying blocks deallocated.
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34Kernel Hackers Manual 2.6.         June 2019             TRUNCATE_PAGECACHE(9)
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