Ross Zwisler 4384cd4bb0 jbd2: introduce jbd2_inode dirty range scoping ... commit 6ba0e7dc64 upstream. Currently both journal_submit_inode_data_buffers() and journal_finish_inode_data_buffers() operate on the entire address space of each of the inodes associated with a given journal entry. The consequence of this is that if we have an inode where we are constantly appending dirty pages we can end up waiting for an indefinite amount of time in journal_finish_inode_data_buffers() while we wait for all the pages under writeback to be written out. The easiest way to cause this type of workload is do just dd from /dev/zero to a file until it fills the entire filesystem. This can cause journal_finish_inode_data_buffers() to wait for the duration of the entire dd operation. We can improve this situation by scoping each of the inode dirty ranges associated with a given transaction. We do this via the jbd2_inode structure so that the scoping is contained within jbd2 and so that it follows the lifetime and locking rules for that structure. This allows us to limit the writeback & wait in journal_submit_inode_data_buffers() and journal_finish_inode_data_buffers() respectively to the dirty range for a given struct jdb2_inode, keeping us from waiting forever if the inode in question is still being appended to. Signed-off-by: Ross Zwisler <zwisler@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-07-31 07:28:47 +02:00
..
checkpoint.c	jbd2: fix use after free in jbd2_log_do_checkpoint()	2018-11-13 11:15:05 -08:00
commit.c	jbd2: introduce jbd2_inode dirty range scoping	2019-07-31 07:28:47 +02:00
journal.c	jbd2: introduce jbd2_inode dirty range scoping	2019-07-31 07:28:47 +02:00
Kconfig	jbd2: remove debug dependency on debug_fs and update Kconfig help text	2013-06-12 23:07:51 -04:00
Makefile
recovery.c	fs: have ll_rw_block users pass in op and flags separately	2016-06-07 13:41:38 -06:00
revoke.c	jbd2: don't leak memory if setting up journal fails	2017-03-15 15:08:48 -04:00
transaction.c	jbd2: introduce jbd2_inode dirty range scoping	2019-07-31 07:28:47 +02:00