jbd2_journal_extend
Prev | Transasction Level | Next

## 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 modications 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.

Prev | Up | Next
jbd2_journal_start_reserved | Home | jbd2__journal_restart