jbd2_journal_extend (9) - Linux Manuals

jbd2_journal_extend: extend buffer credits.

Command to display jbd2_journal_extend manual in Linux: $ man 9 jbd2_journal_extend

NAME

jbd2_journal_extend - extend buffer credits.

SYNOPSIS

int jbd2_journal_extend(handle_t * handle, int nblocks);

ARGUMENTS

handle

: handle to 'extend'

nblocks

: nr blocks to try to extend by.

DESCRIPTION

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.

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.

Return 0 on success, non-zero on failure.

return code < 0 implies an error return code > 0 implies normal transaction-full status.

AUTHORS

Roger Gammans <rgammans [at] computer-surgery.co.uk>

: Author.

Stephen Tweedie <sct [at] redhat.com>

: Author.