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jbd2, ext4, ocfs2: introduce/use journal callbacks j_submit|finish_inode_data_buffers()

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Introduce journal callbacks to allow different behaviors
for an inode in journal_submit|finish_inode_data_buffers().

The existing users of the current behavior (ext4, ocfs2)
are adapted to use the previously exported functions
that implement the current behavior.

Users are callers of jbd2_journal_inode_ranged_write|wait(),
which adds the inode to the transaction's inode list with
the JI_WRITE|WAIT_DATA flags. Only ext4 and ocfs2 in-tree.

Both CONFIG_EXT4_FS and CONFIG_OCSFS2_FS select CONFIG_JBD2,
which builds fs/jbd2/commit.c and journal.c that define and
export the functions, so we can call directly in ext4/ocfs2.

Signed-off-by: Mauricio Faria de Oliveira <mfo@canonical.com>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Link: https://lore.kernel.org/r/20201006004841.600488-3-mfo@canonical.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Mauricio Faria de Oliveira 2020-10-05 21:48:39 -03:00 • committed by Theodore Ts'o
parent aa3c0c61f6
commit 342af94ec6
4 changed files with 50 additions and 13 deletions
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25
include/linux/jbd2.h
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@ -629,7 +629,9 @@ struct transaction_s
struct journal_head *t_shadow_list;
/*
* List of inodes whose data we've modified in data=ordered mode.
* List of inodes associated with the transaction; e.g., ext4 uses
* this to track inodes in data=ordered and data=journal mode that
* need special handling on transaction commit; also used by ocfs2.
* [j_list_lock]
*/
struct list_head t_inode_list;
@ -1111,6 +1113,27 @@ struct journal_s
void (*j_commit_callback)(journal_t *,
transaction_t *);
/**
* @j_submit_inode_data_buffers:
*
* This function is called for all inodes associated with the
* committing transaction marked with JI_WRITE_DATA flag
* before we start to write out the transaction to the journal.
*/
int (*j_submit_inode_data_buffers)
(struct jbd2_inode *);
/**
* @j_finish_inode_data_buffers:
*
* This function is called for all inodes associated with the
* committing transaction marked with JI_WAIT_DATA flag
* after we have written the transaction to the journal
* but before we write out the commit block.
*/
int (*j_finish_inode_data_buffers)
(struct jbd2_inode *);
/*
* Journal statistics
*/