'\" t
.\"     Title: jbd2_journal_extend
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: The Linux Journalling API
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "JBD2_JOURNAL_EXTEND" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "The Linux Journalling API"
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.SH "NAME"
jbd2_journal_extend \- extend buffer credits\&.
.SH "SYNOPSIS"
.HP \w'int\ jbd2_journal_extend('u
.BI "int jbd2_journal_extend(handle_t\ *\ " "handle" ", int\ " "nblocks" ");"
.SH "ARGUMENTS"
.PP
\fIhandle\fR
.RS 4
handle to \*(Aqextend\*(Aq
.RE
.PP
\fInblocks\fR
.RS 4
nr blocks to try to extend by\&.
.RE
.SH "DESCRIPTION"
.PP
Some transactions, such as large extends and truncates, can be done atomically all at once or in several stages\&. The operation requests a credit for a number of buffer modifications in advance, but can extend its credit if it needs more\&.
.PP
jbd2_journal_extend tries to give the running handle more buffer credits\&. It does not guarantee that allocation \- this is a best\-effort only\&. The calling process MUST be able to deal cleanly with a failure to extend here\&.
.PP
Return 0 on success, non\-zero on failure\&.
.PP
return code < 0 implies an error return code > 0 implies normal transaction\-full status\&.
.SH "AUTHORS"
.PP
\fBRoger Gammans\fR <\&rgammans@computer-surgery.co.uk\&>
.RS 4
Author.
.RE
.PP
\fBStephen Tweedie\fR <\&sct@redhat.com\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br