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From: Qu Wenruo <quwenruo@cn.fujitsu.com>
To: linux-btrfs@vger.kernel.org
Subject: [PATCH v3 11/21] btrfs: extent-tree: Switch to new check_data_free_space and free_reserved_data_space
Date: Tue, 13 Oct 2015 10:20:17 +0800	[thread overview]
Message-ID: <1444702827-18169-12-git-send-email-quwenruo@cn.fujitsu.com> (raw)
In-Reply-To: <1444702827-18169-1-git-send-email-quwenruo@cn.fujitsu.com>

Use new reserve/free for buffered write and inode cache.

For buffered write case, as nodatacow write won't increase quota account,
so unlike old behavior which does reserve before check nocow, now we
check nocow first and then only reserve data if we can't do nocow write.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
v2:
  Add call for new free function too. Or we will leak reserved space in
  case of data reservation succeeded but metadata reservation failed.
v3:
  None
---
 fs/btrfs/extent-tree.c |  4 ++--
 fs/btrfs/file.c        | 34 +++++++++++++++++++++-------------
 fs/btrfs/relocation.c  |  8 ++++----
 3 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0cd6baa..f4b9db8 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3356,7 +3356,7 @@ again:
 	num_pages *= 16;
 	num_pages *= PAGE_CACHE_SIZE;
 
-	ret = btrfs_check_data_free_space(inode, num_pages, num_pages);
+	ret = __btrfs_check_data_free_space(inode, 0, num_pages);
 	if (ret)
 		goto out_put;
 
@@ -3365,7 +3365,7 @@ again:
 					      &alloc_hint);
 	if (!ret)
 		dcs = BTRFS_DC_SETUP;
-	btrfs_free_reserved_data_space(inode, num_pages);
+	__btrfs_free_reserved_data_space(inode, 0, num_pages);
 
 out_put:
 	iput(inode);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index b823fac..142b217 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1510,12 +1510,17 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
 		}
 
 		reserve_bytes = num_pages << PAGE_CACHE_SHIFT;
-		ret = btrfs_check_data_free_space(inode, reserve_bytes, write_bytes);
-		if (ret == -ENOSPC &&
-		    (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW |
-					      BTRFS_INODE_PREALLOC))) {
+
+		if (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW |
+					     BTRFS_INODE_PREALLOC)) {
 			ret = check_can_nocow(inode, pos, &write_bytes);
+			if (ret < 0)
+				break;
 			if (ret > 0) {
+				/*
+				 * For nodata cow case, no need to reserve
+				 * data space.
+				 */
 				only_release_metadata = true;
 				/*
 				 * our prealloc extent may be smaller than
@@ -1524,20 +1529,19 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
 				num_pages = DIV_ROUND_UP(write_bytes + offset,
 							 PAGE_CACHE_SIZE);
 				reserve_bytes = num_pages << PAGE_CACHE_SHIFT;
-				ret = 0;
-			} else {
-				ret = -ENOSPC;
+				goto reserve_metadata;
 			}
 		}
-
-		if (ret)
+		ret = __btrfs_check_data_free_space(inode, pos, write_bytes);
+		if (ret < 0)
 			break;
 
+reserve_metadata:
 		ret = btrfs_delalloc_reserve_metadata(inode, reserve_bytes);
 		if (ret) {
 			if (!only_release_metadata)
-				btrfs_free_reserved_data_space(inode,
-							       reserve_bytes);
+				__btrfs_free_reserved_data_space(inode, pos,
+							         write_bytes);
 			else
 				btrfs_end_write_no_snapshoting(root);
 			break;
@@ -2569,8 +2573,11 @@ static long btrfs_fallocate(struct file *file, int mode,
 	/*
 	 * Make sure we have enough space before we do the
 	 * allocation.
+	 * XXX: The behavior must be changed to do accurate check first
+	 * and then check data reserved space.
 	 */
-	ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start, alloc_end - alloc_start);
+	ret = btrfs_check_data_free_space(inode, alloc_start,
+					  alloc_end - alloc_start);
 	if (ret)
 		return ret;
 
@@ -2703,7 +2710,8 @@ static long btrfs_fallocate(struct file *file, int mode,
 out:
 	mutex_unlock(&inode->i_mutex);
 	/* Let go of our reservation. */
-	btrfs_free_reserved_data_space(inode, alloc_end - alloc_start);
+	__btrfs_free_reserved_data_space(inode, alloc_start,
+					 alloc_end - alloc_start);
 	return ret;
 }
 
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 303babe..f4621c5 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3034,8 +3034,8 @@ int prealloc_file_extent_cluster(struct inode *inode,
 	BUG_ON(cluster->start != cluster->boundary[0]);
 	mutex_lock(&inode->i_mutex);
 
-	ret = btrfs_check_data_free_space(inode, cluster->end +
-					  1 - cluster->start, 0);
+	ret = __btrfs_check_data_free_space(inode, cluster->start,
+					    cluster->end + 1 - cluster->start);
 	if (ret)
 		goto out;
 
@@ -3056,8 +3056,8 @@ int prealloc_file_extent_cluster(struct inode *inode,
 			break;
 		nr++;
 	}
-	btrfs_free_reserved_data_space(inode, cluster->end +
-				       1 - cluster->start);
+	__btrfs_free_reserved_data_space(inode, cluster->start,
+					 cluster->end + 1 - cluster->start);
 out:
 	mutex_unlock(&inode->i_mutex);
 	return ret;
-- 
2.6.1


  parent reply	other threads:[~2015-10-13  2:20 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-13  2:20 [PATCH v3 00/21] Rework btrfs qgroup reserved space framework Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 01/21] btrfs: extent_io: Introduce needed structure for recoding set/clear bits Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 02/21] btrfs: extent_io: Introduce new function set_record_extent_bits Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 03/21] btrfs: extent_io: Introduce new function clear_record_extent_bits() Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 04/21] btrfs: qgroup: Introduce btrfs_qgroup_reserve_data function Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 05/21] btrfs: qgroup: Introduce functions to release/free qgroup reserve data space Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 06/21] btrfs: delayed_ref: Add new function to record reserved space into delayed ref Qu Wenruo
2015-10-25 14:39   ` Filipe Manana
2015-10-26  1:27     ` Qu Wenruo
2015-10-27  4:13     ` Qu Wenruo
2015-10-27  5:14       ` Chris Mason
2015-10-27  5:48         ` Qu Wenruo
2015-10-27  6:12           ` Chris Mason
2015-10-27  7:26             ` Qu Wenruo
2015-10-27  9:05             ` Qu Wenruo
2015-10-27 11:34               ` Chris Mason
2015-10-28  0:25                 ` Qu Wenruo
2015-10-28 13:36                 ` Holger Hoffstätte
2015-10-29  6:29                   ` Chris Mason
2015-10-27  9:22       ` Filipe Manana
2015-10-13  2:20 ` [PATCH v3 07/21] btrfs: delayed_ref: release and free qgroup reserved at proper timing Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 08/21] btrfs: qgroup: Introduce new functions to reserve/free metadata Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 09/21] btrfs: qgroup: Use new metadata reservation Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 10/21] btrfs: extent-tree: Add new version of btrfs_check_data_free_space and btrfs_free_reserved_data_space Qu Wenruo
2015-10-13  2:20 ` Qu Wenruo [this message]
2015-10-13  2:20 ` [PATCH v3 12/21] btrfs: extent-tree: Add new version of btrfs_delalloc_reserve/release_space Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 13/21] btrfs: extent-tree: Switch to new delalloc space reserve and release Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 14/21] btrfs: qgroup: Cleanup old inaccurate facilities Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 15/21] btrfs: qgroup: Add handler for NOCOW and inline Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 16/21] btrfs: Add handler for invalidate page Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 17/21] btrfs: qgroup: Add new trace point for qgroup data reserve Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 18/21] btrfs: fallocate: Add support to accurate qgroup reserve Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 19/21] btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 20/21] btrfs: qgroup: Avoid calling btrfs_free_reserved_data_space in clear_bit_hook Qu Wenruo
2015-10-13  2:20 ` [PATCH v3 21/21] btrfs: qgroup: Check if qgroup reserved space leaked Qu Wenruo

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