'\" t
.\"     Title: block_invalidatepage
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: The Linux VFS
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "BLOCK_INVALIDATEPAGE" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "The Linux VFS"
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.SH "NAME"
block_invalidatepage \- invalidate part or all of a buffer\-backed page
.SH "SYNOPSIS"
.HP \w'void\ block_invalidatepage('u
.BI "void block_invalidatepage(struct\ page\ *\ " "page" ", unsigned\ int\ " "offset" ", unsigned\ int\ " "length" ");"
.SH "ARGUMENTS"
.PP
\fIpage\fR
.RS 4
the page which is affected
.RE
.PP
\fIoffset\fR
.RS 4
start of the range to invalidate
.RE
.PP
\fIlength\fR
.RS 4
length of the range to invalidate
.RE
.SH "DESCRIPTION"
.PP
\fBblock_invalidatepage\fR
is called when all or part of the page has become invalidated by a truncate operation\&.
.PP
\fBblock_invalidatepage\fR
does not have to release all buffers, but it must ensure that no dirty buffer is left outside
\fIoffset\fR
and that no I/O is underway against any of the blocks which are outside the truncation point\&. Because the caller is about to free (and possibly reuse) those blocks on\-disk\&.
.SH "COPYRIGHT"
.br