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JBD2_JOURNAL_EXTEND(9) The Linux Journalling API JBD2_JOURNAL_EXTEND(9)

NAME

jbd2_journal_extend - extend buffer credits.

SYNOPSIS

int jbd2_journal_extend(handle_t * handle, int nblocks);

ARGUMENTS

handle_t * handle
handle to 'extend'

int 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@computer-surgery.co.uk>
Author.

Stephen Tweedie <sct@redhat.com>

Author.

COPYRIGHT

September 2017 Kernel Hackers Manual 4.12