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jbd2: make jbd2_handle_buffer_credits() handle reserved handles

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The helper jbd2_handle_buffer_credits() doesn't correctly handle reserved
handles which can lead to crashes. Fix it getting of journal pointer to
work for reserved handles as well.

Fixes: a9a8344ee1 ("ext4, jbd2: Provide accessor function for handle credits")
Reported-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191115102210.29445-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2019-11-15 11:22:10 +01:00 committed by Theodore Ts'o
parent 565333a155
commit 3c845acd02
1 changed files with 6 additions and 2 deletions
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8
include/linux/jbd2.h
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@ -1627,10 +1627,14 @@ static inline tid_t jbd2_get_latest_transaction(journal_t *journal)
return tid;
}
static inline int jbd2_handle_buffer_credits(handle_t *handle)
{
journal_t *journal = handle->h_transaction->t_journal;
journal_t *journal;
if (!handle->h_reserved)
journal = handle->h_transaction->t_journal;
else
journal = handle->h_journal;
return handle->h_total_credits -
DIV_ROUND_UP(handle->h_revoke_credits_requested,