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authorZhang Yi <yi.zhang@huawei.com>2023-11-29 14:47:40 +0300
committerTheodore Ts'o <tytso@mit.edu>2023-12-01 07:27:39 +0300
commit6a3afb6ac6dfab158ebdd4b87941178f58c8939f (patch)
treefbbbf93a03dc5f3fb08947e8060dbe1aa0c5f334 /fs/jbd2
parent85559227211020b270728104c3b89918f7af27ac (diff)
downloadlinux-6a3afb6ac6dfab158ebdd4b87941178f58c8939f.tar.xz
jbd2: increase the journal IO's priority
Current jbd2 only add REQ_SYNC for descriptor block, metadata log buffer, commit buffer and superblock buffer, the submitted IO could be throttled by writeback throttle in block layer, that could lead to priority inversion in some cases. The log IO looks like a kind of high priority metadata IO, so it should not be throttled by WBT like QOS policies in block layer, let's add REQ_SYNC | REQ_IDLE to exempt from writeback throttle, and also add REQ_META together indicates it's a metadata IO. Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20231129114740.2686201-2-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/commit.c9
-rw-r--r--fs/jbd2/journal.c20
2 files changed, 16 insertions, 13 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 8d6f934c3d95..9bdb377a348f 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -119,7 +119,7 @@ static int journal_submit_commit_record(journal_t *journal,
struct commit_header *tmp;
struct buffer_head *bh;
struct timespec64 now;
- blk_opf_t write_flags = REQ_OP_WRITE | REQ_SYNC;
+ blk_opf_t write_flags = REQ_OP_WRITE | JBD2_JOURNAL_REQ_FLAGS;
*cbh = NULL;
@@ -395,8 +395,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
*/
jbd2_journal_update_sb_log_tail(journal,
journal->j_tail_sequence,
- journal->j_tail,
- REQ_SYNC);
+ journal->j_tail, 0);
mutex_unlock(&journal->j_checkpoint_mutex);
} else {
jbd2_debug(3, "superblock not updated\n");
@@ -715,6 +714,7 @@ start_journal_io:
for (i = 0; i < bufs; i++) {
struct buffer_head *bh = wbuf[i];
+
/*
* Compute checksum.
*/
@@ -727,7 +727,8 @@ start_journal_io:
clear_buffer_dirty(bh);
set_buffer_uptodate(bh);
bh->b_end_io = journal_end_buffer_io_sync;
- submit_bh(REQ_OP_WRITE | REQ_SYNC, bh);
+ submit_bh(REQ_OP_WRITE | JBD2_JOURNAL_REQ_FLAGS,
+ bh);
}
cond_resched();
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 71b30f6a662d..206cb53ef2b0 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1100,8 +1100,7 @@ int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block)
* space and if we lose sb update during power failure we'd replay
* old transaction with possibly newly overwritten data.
*/
- ret = jbd2_journal_update_sb_log_tail(journal, tid, block,
- REQ_SYNC | REQ_FUA);
+ ret = jbd2_journal_update_sb_log_tail(journal, tid, block, REQ_FUA);
if (ret)
goto out;
@@ -1775,8 +1774,7 @@ static int journal_reset(journal_t *journal)
*/
jbd2_journal_update_sb_log_tail(journal,
journal->j_tail_sequence,
- journal->j_tail,
- REQ_SYNC | REQ_FUA);
+ journal->j_tail, REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
}
return jbd2_journal_start_thread(journal);
@@ -1798,6 +1796,11 @@ static int jbd2_write_superblock(journal_t *journal, blk_opf_t write_flags)
return -EIO;
}
+ /*
+ * Always set high priority flags to exempt from block layer's
+ * QOS policies, e.g. writeback throttle.
+ */
+ write_flags |= JBD2_JOURNAL_REQ_FLAGS;
if (!(journal->j_flags & JBD2_BARRIER))
write_flags &= ~(REQ_FUA | REQ_PREFLUSH);
@@ -2052,7 +2055,7 @@ void jbd2_journal_update_sb_errno(journal_t *journal)
jbd2_debug(1, "JBD2: updating superblock error (errno %d)\n", errcode);
sb->s_errno = cpu_to_be32(errcode);
- jbd2_write_superblock(journal, REQ_SYNC | REQ_FUA);
+ jbd2_write_superblock(journal, REQ_FUA);
}
EXPORT_SYMBOL(jbd2_journal_update_sb_errno);
@@ -2173,8 +2176,7 @@ int jbd2_journal_destroy(journal_t *journal)
++journal->j_transaction_sequence;
write_unlock(&journal->j_state_lock);
- jbd2_mark_journal_empty(journal,
- REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
+ jbd2_mark_journal_empty(journal, REQ_PREFLUSH | REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
} else
err = -EIO;
@@ -2475,7 +2477,7 @@ int jbd2_journal_flush(journal_t *journal, unsigned int flags)
* the magic code for a fully-recovered superblock. Any future
* commits of data to the journal will restore the current
* s_start value. */
- jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA);
+ jbd2_mark_journal_empty(journal, REQ_FUA);
if (flags)
err = __jbd2_journal_erase(journal, flags);
@@ -2521,7 +2523,7 @@ int jbd2_journal_wipe(journal_t *journal, int write)
if (write) {
/* Lock to make assertions happy... */
mutex_lock_io(&journal->j_checkpoint_mutex);
- jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA);
+ jbd2_mark_journal_empty(journal, REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
}