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ext4: add discard/zeroout flags to journal flush

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Add a flags argument to jbd2_journal_flush to enable discarding or
zero-filling the journal blocks while flushing the journal.

Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Link: https://lore.kernel.org/r/20210518151327.130198-1-leah.rumancik@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Leah Rumancik
2021-05-18 15:13:25 +00:00
committed by Theodore Ts'o
parent 8f6840c4fd
commit 01d5d96542
7 changed files with 134 additions and 17 deletions
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6
include/linux/jbd2.h
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@@ -1370,6 +1370,10 @@ JBD2_FEATURE_INCOMPAT_FUNCS(fast_commit, FAST_COMMIT)
* mode */
#define JBD2_FAST_COMMIT_ONGOING 0x100 /* Fast commit is ongoing */
#define JBD2_FULL_COMMIT_ONGOING 0x200 /* Full commit is ongoing */
#define JBD2_JOURNAL_FLUSH_DISCARD 0x0001
#define JBD2_JOURNAL_FLUSH_ZEROOUT 0x0002
#define JBD2_JOURNAL_FLUSH_VALID (JBD2_JOURNAL_FLUSH_DISCARD | \
JBD2_JOURNAL_FLUSH_ZEROOUT)
/*
* Function declarations for the journaling transaction and buffer
@@ -1500,7 +1504,7 @@ extern int jbd2_journal_invalidatepage(journal_t *,
struct page *, unsigned int, unsigned int);
extern int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page);
extern int jbd2_journal_stop(handle_t *);
extern int jbd2_journal_flush (journal_t *);
extern int jbd2_journal_flush(journal_t *journal, unsigned int flags);
extern void jbd2_journal_lock_updates (journal_t *);
extern void jbd2_journal_unlock_updates (journal_t *);