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 old, loff_t new);
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ARGUMENTS

12       inode
13           inode
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15       old
16           old file offset
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18       new
19           new file offset
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DESCRIPTION

22       inode's new i_size must already be written before truncate_pagecache is
23       called.
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25       This function should typically be called before the filesystem releases
26       resources associated with the freed range (eg. deallocates blocks).
27       This way, pagecache will always stay logically coherent with on-disk
28       format, and the filesystem would not have to deal with situations such
29       as writepage being called for a page that has already had its
30       underlying blocks deallocated.
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33Kernel Hackers Manual 2.6.       November 2011           TRUNCATE_PAGECACHE(9)
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