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Message-Id: <20210518151327.130198-1-leah.rumancik@gmail.com>
Date: Tue, 18 May 2021 15:13:25 +0000
From: Leah Rumancik <leah.rumancik@...il.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu, Leah Rumancik <leah.rumancik@...il.com>
Subject: [PATCH v5 1/3] ext4: add discard/zeroout flags to journal flush
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@...il.com>
Changes in v4:
- restructured code division between patches
- changed jbd2_journal_flush flags arg from bool to unsigned long long
Changes in v5:
- changed jbd2_journal_flush flags to unsigned int
- changed name of jbd2_journal_flush flags from JBD2_ERASE* to
JBD2_JOURNAL_FLUSH*
- cleaned up loop in jbd2_journal_erase which finds contiguous regions
- updated flag checking
---
fs/ext4/inode.c | 4 +-
fs/ext4/ioctl.c | 6 +--
fs/ext4/super.c | 6 +--
fs/jbd2/journal.c | 119 +++++++++++++++++++++++++++++++++++++++++--
fs/ocfs2/alloc.c | 2 +-
fs/ocfs2/journal.c | 8 +--
include/linux/jbd2.h | 6 ++-
7 files changed, 134 insertions(+), 17 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index fe6045a46599..f44800361a38 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3223,7 +3223,7 @@ static sector_t ext4_bmap(struct address_space *mapping, sector_t block)
ext4_clear_inode_state(inode, EXT4_STATE_JDATA);
journal = EXT4_JOURNAL(inode);
jbd2_journal_lock_updates(journal);
- err = jbd2_journal_flush(journal);
+ err = jbd2_journal_flush(journal, 0);
jbd2_journal_unlock_updates(journal);
if (err)
@@ -6005,7 +6005,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
if (val)
ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA);
else {
- err = jbd2_journal_flush(journal);
+ err = jbd2_journal_flush(journal, 0);
if (err < 0) {
jbd2_journal_unlock_updates(journal);
percpu_up_write(&sbi->s_writepages_rwsem);
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 0796bfa72829..d5512e17a13f 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -762,7 +762,7 @@ static long ext4_ioctl_group_add(struct file *file,
err = ext4_group_add(sb, input);
if (EXT4_SB(sb)->s_journal) {
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
- err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
}
if (err == 0)
@@ -945,7 +945,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
if (EXT4_SB(sb)->s_journal) {
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
- err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
}
if (err == 0)
@@ -1088,7 +1088,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (EXT4_SB(sb)->s_journal) {
ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE);
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
- err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
}
if (err == 0)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 886e0d518668..fe3ae750d83a 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5639,7 +5639,7 @@ static int ext4_mark_recovery_complete(struct super_block *sb,
return 0;
}
jbd2_journal_lock_updates(journal);
- err = jbd2_journal_flush(journal);
+ err = jbd2_journal_flush(journal, 0);
if (err < 0)
goto out;
@@ -5781,7 +5781,7 @@ static int ext4_freeze(struct super_block *sb)
* Don't clear the needs_recovery flag if we failed to
* flush the journal.
*/
- error = jbd2_journal_flush(journal);
+ error = jbd2_journal_flush(journal, 0);
if (error < 0)
goto out;
@@ -6379,7 +6379,7 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
* otherwise be livelocked...
*/
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
- err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
if (err)
return err;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 2dc944442802..521ce41c242c 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1686,6 +1686,110 @@ static void jbd2_mark_journal_empty(journal_t *journal, int write_op)
write_unlock(&journal->j_state_lock);
}
+/**
+ * __jbd2_journal_erase() - Discard or zeroout journal blocks (excluding superblock)
+ * @journal: The journal to erase.
+ * @flags: A discard/zeroout request is sent for each physically contigous
+ * region of the journal. Either JBD2_JOURNAL_FLUSH_DISCARD or
+ * JBD2_JOURNAL_FLUSH_ZEROOUT must be set to determine which operation
+ * to perform.
+ *
+ * Note: JBD2_JOURNAL_FLUSH_ZEROOUT attempts to use hardware offload. Zeroes
+ * will be explicitly written if no hardware offload is available, see
+ * blkdev_issue_zeroout for more details.
+ */
+static int __jbd2_journal_erase(journal_t *journal, unsigned int flags)
+{
+ int err = 0;
+ unsigned long block, log_offset; /* logical */
+ unsigned long long phys_block, block_start, block_stop; /* physical */
+ loff_t byte_start, byte_stop, byte_count;
+ struct request_queue *q = bdev_get_queue(journal->j_dev);
+
+ /* flags must be set to either discard or zeroout */
+ if ((flags & ~JBD2_JOURNAL_FLUSH_VALID) || !flags ||
+ ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
+ (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
+ return -EINVAL;
+
+ if (!q)
+ return -ENXIO;
+
+ if (JBD2_JOURNAL_FLUSH_DISCARD & !blk_queue_discard(q))
+ return -EOPNOTSUPP;
+
+ /*
+ * lookup block mapping and issue discard/zeroout for each
+ * contiguous region
+ */
+ log_offset = be32_to_cpu(journal->j_superblock->s_first);
+ block_start = ~0ULL;
+ for (block = log_offset; block < journal->j_total_len; block++) {
+ err = jbd2_journal_bmap(journal, block, &phys_block);
+ if (err) {
+ pr_err("JBD2: bad block at offset %lu", block);
+ return err;
+ }
+
+ if (block_start == ~0ULL) {
+ block_start = phys_block;
+ block_stop = block_start - 1;
+ }
+
+ /*
+ * last block not contiguous with current block,
+ * process last contiguous region and return to this block on
+ * next loop
+ */
+ if (phys_block != block_stop + 1) {
+ block--;
+ } else {
+ block_stop++;
+ /*
+ * if this isn't the last block of journal,
+ * no need to process now because next block may also
+ * be part of this contiguous region
+ */
+ if (block != journal->j_total_len - 1)
+ continue;
+ }
+
+ /*
+ * end of contiguous region or this is last block of journal,
+ * take care of the region
+ */
+ byte_start = block_start * journal->j_blocksize;
+ byte_stop = block_stop * journal->j_blocksize;
+ byte_count = (block_stop - block_start + 1) *
+ journal->j_blocksize;
+
+ truncate_inode_pages_range(journal->j_dev->bd_inode->i_mapping,
+ byte_start, byte_stop);
+
+ if (flags & JBD2_JOURNAL_FLUSH_DISCARD) {
+ err = blkdev_issue_discard(journal->j_dev,
+ byte_start >> SECTOR_SHIFT,
+ byte_count >> SECTOR_SHIFT,
+ GFP_NOFS, 0);
+ } else if (flags & JBD2_JOURNAL_FLUSH_ZEROOUT) {
+ err = blkdev_issue_zeroout(journal->j_dev,
+ byte_start >> SECTOR_SHIFT,
+ byte_count >> SECTOR_SHIFT,
+ GFP_NOFS, 0);
+ }
+
+ if (unlikely(err != 0)) {
+ pr_err("JBD2: (error %d) unable to wipe journal at physical blocks %llu - %llu",
+ err, block_start, block_stop);
+ return err;
+ }
+
+ /* reset start and stop after processing a region */
+ block_start = ~0ULL;
+ }
+
+ return blkdev_issue_flush(journal->j_dev);
+}
/**
* jbd2_journal_update_sb_errno() - Update error in the journal.
@@ -2246,13 +2350,18 @@ EXPORT_SYMBOL(jbd2_journal_clear_features);
/**
* jbd2_journal_flush() - Flush journal
* @journal: Journal to act on.
+ * @flags: optional operation on the journal blocks after the flush (see below)
*
* Flush all data for a given journal to disk and empty the journal.
* Filesystems can use this when remounting readonly to ensure that
- * recovery does not need to happen on remount.
+ * recovery does not need to happen on remount. Optionally, a discard or zeroout
+ * can be issued on the journal blocks after flushing.
+ *
+ * flags:
+ * JBD2_JOURNAL_FLUSH_DISCARD: issues discards for the journal blocks
+ * JBD2_JOURNAL_FLUSH_ZEROOUT: issues zeroouts for the journal blocks
*/
-
-int jbd2_journal_flush(journal_t *journal)
+int jbd2_journal_flush(journal_t *journal, unsigned int flags)
{
int err = 0;
transaction_t *transaction = NULL;
@@ -2306,6 +2415,10 @@ int jbd2_journal_flush(journal_t *journal)
* commits of data to the journal will restore the current
* s_start value. */
jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA);
+
+ if (flags)
+ err = __jbd2_journal_erase(journal, flags);
+
mutex_unlock(&journal->j_checkpoint_mutex);
write_lock(&journal->j_state_lock);
J_ASSERT(!journal->j_running_transaction);
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 78710788c237..1b41bf9f4a7e 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6020,7 +6020,7 @@ int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
* Then truncate log will be replayed resulting in cluster double free.
*/
jbd2_journal_lock_updates(journal->j_journal);
- status = jbd2_journal_flush(journal->j_journal);
+ status = jbd2_journal_flush(journal->j_journal, 0);
jbd2_journal_unlock_updates(journal->j_journal);
if (status < 0) {
mlog_errno(status);
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index db52e843002a..a1438548747e 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -310,7 +310,7 @@ static int ocfs2_commit_cache(struct ocfs2_super *osb)
}
jbd2_journal_lock_updates(journal->j_journal);
- status = jbd2_journal_flush(journal->j_journal);
+ status = jbd2_journal_flush(journal->j_journal, 0);
jbd2_journal_unlock_updates(journal->j_journal);
if (status < 0) {
up_write(&journal->j_trans_barrier);
@@ -1002,7 +1002,7 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
if (ocfs2_mount_local(osb)) {
jbd2_journal_lock_updates(journal->j_journal);
- status = jbd2_journal_flush(journal->j_journal);
+ status = jbd2_journal_flush(journal->j_journal, 0);
jbd2_journal_unlock_updates(journal->j_journal);
if (status < 0)
mlog_errno(status);
@@ -1072,7 +1072,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed)
if (replayed) {
jbd2_journal_lock_updates(journal->j_journal);
- status = jbd2_journal_flush(journal->j_journal);
+ status = jbd2_journal_flush(journal->j_journal, 0);
jbd2_journal_unlock_updates(journal->j_journal);
if (status < 0)
mlog_errno(status);
@@ -1668,7 +1668,7 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
/* wipe the journal */
jbd2_journal_lock_updates(journal);
- status = jbd2_journal_flush(journal);
+ status = jbd2_journal_flush(journal, 0);
jbd2_journal_unlock_updates(journal);
if (status < 0)
mlog_errno(status);
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index db0e1920cb12..8543233b0388 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -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 *);
--
2.31.1.751.gd2f1c929bd-goog
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