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jbd2: Make credit checking more strict

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Make checking of available credits in jbd2_journal_dirty_metadata() more
strict. There should be always enough credits in the handle to write all
potential revoke descriptors. Also we warn in case there are not enough
credits since this is a bug in the filesystem.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191105164437.32602-22-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2019-11-05 17:44:28 +01:00 committed by Theodore Ts'o
parent 933f1c1e0b
commit d090707eda
1 changed files with 1 additions and 1 deletions
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2
fs/jbd2/transaction.c
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@ -1477,7 +1477,7 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
* of the transaction. This needs to be done
* once a transaction -bzzz
*/
if (handle->h_total_credits <= 0) {
if (WARN_ON_ONCE(jbd2_handle_buffer_credits(handle) <= 0)) {
ret = -ENOSPC;
goto out_unlock_bh;
}