linux-ext4 - [PATCH v2 5/8] fs/jbd2: use sleeping version of __find_get

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Message-ID: <20250410014945.2140781-6-mcgrof@kernel.org>
Date: Wed,  9 Apr 2025 18:49:42 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: brauner@...nel.org,
	jack@...e.cz,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org,
	riel@...riel.com
Cc: dave@...olabs.net,
	willy@...radead.org,
	hannes@...xchg.org,
	oliver.sang@...el.com,
	david@...hat.com,
	axboe@...nel.dk,
	hare@...e.de,
	david@...morbit.com,
	djwong@...nel.org,
	ritesh.list@...il.com,
	linux-fsdevel@...r.kernel.org,
	linux-block@...r.kernel.org,
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	gost.dev@...sung.com,
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	da.gomez@...sung.com,
	mcgrof@...nel.org
Subject: [PATCH v2 5/8] fs/jbd2: use sleeping version of __find_get_block()

From: Davidlohr Bueso <dave@...olabs.net>

Convert to the new nonatomic flavor to benefit from potential
performance benefits and adapt in the future vs migration such
that semantics are kept.

- jbd2_journal_revoke(): can sleep (has might_sleep() in the beginning)

- jbd2_journal_cancel_revoke(): only used from do_get_write_access() and
    do_get_create_access() which do sleep. So can sleep.

- jbd2_clear_buffer_revoked_flags() - only called from journal commit code
    which sleeps. So can sleep.

Suggested-by: Jan Kara <jack@...e.cz>
Signed-off-by: Davidlohr Bueso <dave@...olabs.net>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 fs/jbd2/revoke.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
index 0cf0fddbee81..1467f6790747 100644
--- a/fs/jbd2/revoke.c
+++ b/fs/jbd2/revoke.c
@@ -345,7 +345,8 @@ int jbd2_journal_revoke(handle_t *handle, unsigned long long blocknr,
 	bh = bh_in;
 
 	if (!bh) {
-		bh = __find_get_block(bdev, blocknr, journal->j_blocksize);
+		bh = __find_get_block_nonatomic(bdev, blocknr,
+						journal->j_blocksize);
 		if (bh)
 			BUFFER_TRACE(bh, "found on hash");
 	}
@@ -355,7 +356,8 @@ int jbd2_journal_revoke(handle_t *handle, unsigned long long blocknr,
 
 		/* If there is a different buffer_head lying around in
 		 * memory anywhere... */
-		bh2 = __find_get_block(bdev, blocknr, journal->j_blocksize);
+		bh2 = __find_get_block_nonatomic(bdev, blocknr,
+						 journal->j_blocksize);
 		if (bh2) {
 			/* ... and it has RevokeValid status... */
 			if (bh2 != bh && buffer_revokevalid(bh2))
@@ -464,7 +466,8 @@ void jbd2_journal_cancel_revoke(handle_t *handle, struct journal_head *jh)
 	 * state machine will get very upset later on. */
 	if (need_cancel) {
 		struct buffer_head *bh2;
-		bh2 = __find_get_block(bh->b_bdev, bh->b_blocknr, bh->b_size);
+		bh2 = __find_get_block_nonatomic(bh->b_bdev, bh->b_blocknr,
+						 bh->b_size);
 		if (bh2) {
 			if (bh2 != bh)
 				clear_buffer_revoked(bh2);
@@ -492,9 +495,9 @@ void jbd2_clear_buffer_revoked_flags(journal_t *journal)
 			struct jbd2_revoke_record_s *record;
 			struct buffer_head *bh;
 			record = (struct jbd2_revoke_record_s *)list_entry;
-			bh = __find_get_block(journal->j_fs_dev,
-					      record->blocknr,
-					      journal->j_blocksize);
+			bh = __find_get_block_nonatomic(journal->j_fs_dev,
+							record->blocknr,
+							journal->j_blocksize);
 			if (bh) {
 				clear_buffer_revoked(bh);
 				__brelse(bh);
-- 
2.47.2