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From: Stefan Roesch <[email protected]>
To: <[email protected]>, <[email protected]>,
	<[email protected]>, <[email protected]>
Cc: <[email protected]>, <[email protected]>, <[email protected]>,
	<[email protected]>
Subject: [PATCH v3 06/12] btrfs: make btrfs_check_nocow_lock nowait compatible
Date: Mon, 12 Sep 2022 12:27:46 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

From: Josef Bacik <[email protected]>

Now all the helpers that btrfs_check_nocow_lock uses handle nowait, add
a nowait flag to btrfs_check_nocow_lock so it can be used by the write
path.

Signed-off-by: Josef Bacik <[email protected]>
Signed-off-by: Stefan Roesch <[email protected]>
---
 fs/btrfs/ctree.h |  2 +-
 fs/btrfs/file.c  | 33 ++++++++++++++++++++++-----------
 fs/btrfs/inode.c |  2 +-
 3 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 5cc5394503e0..eb25d007e651 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3480,7 +3480,7 @@ int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
 		      struct extent_state **cached, bool noreserve);
 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
-			   size_t *write_bytes);
+			   size_t *write_bytes, bool nowait);
 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
 
 /* tree-defrag.c */
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 0f257205c63d..f18efd9f2bc3 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1481,7 +1481,7 @@ lock_and_cleanup_extent_if_need(struct btrfs_inode *inode, struct page **pages,
  * NOTE: Callers need to call btrfs_check_nocow_unlock() if we return > 0.
  */
 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
-			   size_t *write_bytes)
+			   size_t *write_bytes, bool nowait)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	struct btrfs_root *root = inode->root;
@@ -1500,16 +1500,21 @@ int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
 			   fs_info->sectorsize) - 1;
 	num_bytes = lockend - lockstart + 1;
 
-	btrfs_lock_and_flush_ordered_range(inode, lockstart, lockend, NULL);
+	if (nowait) {
+		if (!btrfs_try_lock_ordered_range(inode, lockstart, lockend)) {
+			btrfs_drew_write_unlock(&root->snapshot_lock);
+			return -EAGAIN;
+		}
+	} else {
+		btrfs_lock_and_flush_ordered_range(inode, lockstart, lockend, NULL);
+	}
 	ret = can_nocow_extent(&inode->vfs_inode, lockstart, &num_bytes,
-			NULL, NULL, NULL, false, false);
-	if (ret <= 0) {
-		ret = 0;
+			NULL, NULL, NULL, nowait, false);
+	if (ret <= 0)
 		btrfs_drew_write_unlock(&root->snapshot_lock);
-	} else {
+	else
 		*write_bytes = min_t(size_t, *write_bytes ,
 				     num_bytes - pos + lockstart);
-	}
 	unlock_extent(&inode->io_tree, lockstart, lockend);
 
 	return ret;
@@ -1666,16 +1671,22 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
 						  &data_reserved, pos,
 						  write_bytes, false);
 		if (ret < 0) {
+			int can_nocow;
+
 			/*
 			 * If we don't have to COW at the offset, reserve
 			 * metadata only. write_bytes may get smaller than
 			 * requested here.
 			 */
-			if (btrfs_check_nocow_lock(BTRFS_I(inode), pos,
-						   &write_bytes) > 0)
-				only_release_metadata = true;
-			else
+			can_nocow = btrfs_check_nocow_lock(BTRFS_I(inode), pos,
+							   &write_bytes, false);
+			if (can_nocow < 0)
+				ret = can_nocow;
+			if (can_nocow > 0)
+				ret = 0;
+			if (ret)
 				break;
+			only_release_metadata = true;
 		}
 
 		num_pages = DIV_ROUND_UP(write_bytes + offset, PAGE_SIZE);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 52b3abb4c57c..4ff07b47df82 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4883,7 +4883,7 @@ int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
 	ret = btrfs_check_data_free_space(inode, &data_reserved, block_start,
 					  blocksize, false);
 	if (ret < 0) {
-		if (btrfs_check_nocow_lock(inode, block_start, &write_bytes) > 0) {
+		if (btrfs_check_nocow_lock(inode, block_start, &write_bytes, false) > 0) {
 			/* For nocow case, no need to reserve data space */
 			only_release_metadata = true;
 		} else {
-- 
2.30.2


  parent reply	other threads:[~2022-09-12 19:28 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-12 19:27 [PATCH v3 00/12] io-uring/btrfs: support async buffered writes Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 01/12] mm: export balance_dirty_pages_ratelimited_flags() Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 02/12] btrfs: implement a nowait option for tree searches Stefan Roesch
2022-09-26  9:14   ` Filipe Manana
2022-09-26 10:55     ` David Sterba
2022-09-12 19:27 ` [PATCH v3 03/12] btrfs: make can_nocow_extent nowait compatible Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 04/12] btrfs: add the ability to use NO_FLUSH for data reservations Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 05/12] btrfs: add btrfs_try_lock_ordered_range Stefan Roesch
2022-09-12 19:27 ` Stefan Roesch [this message]
2022-09-12 19:27 ` [PATCH v3 07/12] btrfs: make prepare_pages nowait compatible Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 08/12] btrfs: make lock_and_cleanup_extent_if_need " Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 09/12] btrfs: plumb NOWAIT through the write path Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 10/12] btrfs: make balance_dirty_pages nowait compatible Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 11/12] btrfs: assert nowait mode is not used for some btree search functions Stefan Roesch
2022-09-12 19:27 ` [PATCH v3 12/12] btrfs: enable nowait async buffered writes Stefan Roesch
2022-09-13  9:47 ` [PATCH v3 00/12] io-uring/btrfs: support " Filipe Manana
2022-09-20 12:25 ` David Sterba
2022-09-21 10:19   ` David Sterba
2022-09-21 14:33     ` Jens Axboe

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