truncate_pagecache(9) [centos man page]

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

NAME

       truncate_pagecache - unmap and remove pagecache that has been truncated

SYNOPSIS

       void truncate_pagecache(struct inode * inode, loff_t oldsize, loff_t newsize);

ARGUMENTS

       inode
	   inode

       oldsize
	   old file size

       newsize
	   new file size

DESCRIPTION

       inode's new i_size must already be written before truncate_pagecache is called.

       This function should typically be called before the filesystem releases resources associated with the freed range (eg. deallocates blocks).
       This way, pagecache will always stay logically coherent with on-disk format, and the filesystem would not have to deal with situations such
       as writepage being called for a page that has already had its underlying blocks deallocated.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						     TRUNCATE_PAGECACHE(9)

MREMAP(2)						      BSD System Calls Manual							 MREMAP(2)

NAME

     mremap -- re-map a virtual memory address

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/mman.h>

     void *
     mremap(void *oldp, size_t oldsize, void *newp, size_t newsize, int flags);

DESCRIPTION

     The mremap() function resizes the mapped range (see mmap(2)) starting at oldp and having size oldsize to newsize.	The following arguments
     can be OR'ed together in the flags argument:

     MAP_ALIGNED(n)	The allocation should be aligned to the given boundary, i.e. ensure that the lowest n bits of the address are zero.  The
			parameter n should be the base 2 logarithm of the desired alignment (e.g., to request alignment to 16K, use 14 as the
			value for n).  The alignment must be equal to or greater than the platform's page size as returned by sysconf(3) with the
			_SC_PAGESIZE request.

     MAP_FIXED		newp is tried and mremap() fails if that address can't be used as new base address for the range.  Otherwise, oldp and
			newp are used as hints for the position, factoring in the given alignment.

RETURN VALUES

     mremap() returns the new address or MAP_FAILED, if the remap failed.

COMPATIBILITY

     The semantics of mremap() differ from the one provided by glibc on Linux in that the newp argument was added and a different set of flags are
     implemented.

SEE ALSO

     mmap(2), munmap(2)

HISTORY

     The mremap() system call appeared in NetBSD 5.0.  It was based on the code that supports mremap() compatibility for Linux binaries.

BSD
								 February 14, 2008							       BSD