'\" t
.\"     Title: clean_bdev_aliases
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: July 2017
.\"    Manual: The Linux VFS
.\"    Source: Kernel Hackers Manual 4.12.2
.\"  Language: English
.\"
.TH "CLEAN_BDEV_ALIASES" "9" "July 2017" "Kernel Hackers Manual 4\&.12\&" "The Linux VFS"
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.SH "NAME"
clean_bdev_aliases \- 
.SH "SYNOPSIS"
.HP \w'void\ clean_bdev_aliases('u
.BI "void clean_bdev_aliases(struct\ block_device\ *\ " "bdev" ", sector_t\ " "block" ", sector_t\ " "len" ");"
.SH "ARGUMENTS"
.PP
\fIstruct block_device * bdev\fR
.RS 4
Block device to clean buffers in
.RE
.PP
\fIsector_t block\fR
.RS 4
Start of a range of blocks to clean
.RE
.PP
\fIsector_t len\fR
.RS 4
Number of blocks to clean
.RE
.SH "DESCRIPTION"
.PP
We are taking a range of blocks for data and we don\*(Aqt want writeback of any buffer\-cache aliases starting from return from this function and until the moment when something will explicitly mark the buffer dirty (hopefully that will not happen until we will free that block ;\-) We don\*(Aqt even need to mark it not\-uptodate \- nobody can expect anything from a newly allocated buffer anyway\&. We used to use
\fBunmap_buffer\fR
for such invalidation, but that was wrong\&. We definitely don\*(Aqt want to mark the alias unmapped, for example \- it would confuse anyone who might pick it with
\fBbread\fR
afterwards\&.\&.\&.
.PP
Also\&.\&. Note that
\fBbforget\fR
doesn\*(Aqt lock the buffer\&. So there can be writeout I/O going on against recently\-freed buffers\&. We don\*(Aqt wait on that I/O in
\fBbforget\fR
\- it\*(Aqs more efficient to wait on the I/O only if we really need to\&. That happens here\&.
.SH "COPYRIGHT"
.br