thr3ads.net - Btrfs devel - [PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2 [Jul 2011]

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Josef Bacik

2011-Jul-18 18:11 UTC

[PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2

Currently we reserve enough space to COW an entirely full btree for every extent
we have reserved for an inode.  This _sucks_, because you only need to COW once,
and then everybody else is ok.  Unfortunately we don''t know
we''ll all be able to
get into the same transaction so that''s what we have had to do.  But
the global
reserve holds a reservation large enough to cover a large percentage of all the
metadata currently in the fs.  So all we really need to account for is any new
blocks that we may allocate.  So fix this by

1) Passing to btrfs_alloc_free_block() wether this is a new block or a COW
block.  If it is a COW block we use the global reserve, if not we use the
trans->block_rsv.
2) Reduce the amount of space we reserve.  Since we don''t need to
account for
cow''ing the tree we can just keep track of new blocks to reserve, which
greatly
reduces the reservation amount.

This makes my basic random write test go from 3 mb/s to 75 mb/s.  I''ve
tested
this with my horrible ENOSPC test and it seems to work out fine.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
---
V1->V2:
-fix a problem reported by Liubo, we need to make sure that we move bytes
over for any new extents we may add to the extent tree so we don''t get
a bunch
of warnings.
-fix the global reserve to reserve 50% of the metadata space currently used.
 fs/btrfs/ctree.c       |   10 +++++-----
 fs/btrfs/ctree.h       |    5 ++---
 fs/btrfs/disk-io.c     |    3 ++-
 fs/btrfs/extent-tree.c |   20 +++++++++++++++-----
 fs/btrfs/ioctl.c       |    2 +-
 5 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 2e66786..fbd48e9 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -206,7 +206,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
 
 	cow = btrfs_alloc_free_block(trans, root, buf->len, 0,
 				     new_root_objectid, &disk_key, level,
-				     buf->start, 0);
+				     buf->start, 0, 1);
 	if (IS_ERR(cow))
 		return PTR_ERR(cow);
 
@@ -412,7 +412,7 @@ static noinline int __btrfs_cow_block(struct
btrfs_trans_handle *trans,
 
 	cow = btrfs_alloc_free_block(trans, root, buf->len, parent_start,
 				     root->root_key.objectid, &disk_key,
-				     level, search_start, empty_size);
+				     level, search_start, empty_size, 0);
 	if (IS_ERR(cow))
 		return PTR_ERR(cow);
 
@@ -1985,7 +1985,7 @@ static noinline int insert_new_root(struct
btrfs_trans_handle *trans,
 
 	c = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
 				   root->root_key.objectid, &lower_key,
-				   level, root->node->start, 0);
+				   level, root->node->start, 0, 1);
 	if (IS_ERR(c))
 		return PTR_ERR(c);
 
@@ -2112,7 +2112,7 @@ static noinline int split_node(struct btrfs_trans_handle
*trans,
 
 	split = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
 					root->root_key.objectid,
-					&disk_key, level, c->start, 0);
+					&disk_key, level, c->start, 0, 1);
 	if (IS_ERR(split))
 		return PTR_ERR(split);
 
@@ -2937,7 +2937,7 @@ again:
 
 	right = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
 					root->root_key.objectid,
-					&disk_key, 0, l->start, 0);
+					&disk_key, 0, l->start, 0, 1);
 	if (IS_ERR(right))
 		return PTR_ERR(right);
 
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3ba4d5f..1accb56 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2135,8 +2135,7 @@ static inline bool btrfs_mixed_space_info(struct
btrfs_space_info *space_info)
 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
 						 unsigned num_items)
 {
-	return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
-		3 * num_items;
+	return root->leafsize * 3 * num_items;
 }
 
 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
@@ -2161,7 +2160,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct
btrfs_trans_handle *trans,
 					struct btrfs_root *root, u32 blocksize,
 					u64 parent, u64 root_objectid,
 					struct btrfs_disk_key *key, int level,
-					u64 hint, u64 empty_size);
+					u64 hint, u64 empty_size, int new_block);
 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 			   struct btrfs_root *root,
 			   struct extent_buffer *buf,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 234a084..0245cad 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1143,7 +1143,8 @@ static struct btrfs_root *alloc_log_tree(struct
btrfs_trans_handle *trans,
 	root->ref_cows = 0;
 
 	leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
-				      BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0);
+				      BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0,
+				      1);
 	if (IS_ERR(leaf)) {
 		kfree(root);
 		return ERR_CAST(leaf);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2e0f87b..e2dd833 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5661,13 +5661,23 @@ struct extent_buffer *btrfs_init_new_buffer(struct
btrfs_trans_handle *trans,
 
 static struct btrfs_block_rsv *
 use_block_rsv(struct btrfs_trans_handle *trans,
-	      struct btrfs_root *root, u32 blocksize)
+	      struct btrfs_root *root, u32 blocksize, int new_block)
 {
-	struct btrfs_block_rsv *block_rsv;
+	struct btrfs_block_rsv *block_rsv = NULL;
 	struct btrfs_block_rsv *global_rsv =
&root->fs_info->global_block_rsv;
 	int ret;
 
-	block_rsv = get_block_rsv(trans, root);
+	if (root->ref_cows) {
+		if (new_block)
+			block_rsv = trans->block_rsv;
+		else
+			block_rsv = global_rsv;
+	} else {
+		block_rsv = root->block_rsv;
+	}
+
+	if (!block_rsv)
+		block_rsv = &root->fs_info->empty_block_rsv;
 
 	if (block_rsv->size == 0) {
 		ret = reserve_metadata_bytes(trans, root, block_rsv,
@@ -5726,7 +5736,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct
btrfs_trans_handle *trans,
 					struct btrfs_root *root, u32 blocksize,
 					u64 parent, u64 root_objectid,
 					struct btrfs_disk_key *key, int level,
-					u64 hint, u64 empty_size)
+					u64 hint, u64 empty_size, int new_block)
 {
 	struct btrfs_key ins;
 	struct btrfs_block_rsv *block_rsv;
@@ -5735,7 +5745,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct
btrfs_trans_handle *trans,
 	int ret;
 
 
-	block_rsv = use_block_rsv(trans, root, blocksize);
+	block_rsv = use_block_rsv(trans, root, blocksize, new_block);
 	if (IS_ERR(block_rsv))
 		return ERR_CAST(block_rsv);
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index fd252ff..39fb634 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -352,7 +352,7 @@ static noinline int create_subvol(struct btrfs_root *root,
 	}
 
 	leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
-				      0, objectid, NULL, 0, 0, 0);
+				      0, objectid, NULL, 0, 0, 0, 1);
 	if (IS_ERR(leaf)) {
 		ret = PTR_ERR(leaf);
 		goto fail;
-- 
1.7.5.2

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Josef Bacik

2011-Jul-18 18:14 UTC

head link

Re: [PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2

On 07/18/2011 02:11 PM, Josef Bacik wrote:> Currently we reserve enough space to COW an entirely full btree for every
extent
> we have reserved for an inode.  This _sucks_, because you only need to COW
once,
> and then everybody else is ok.  Unfortunately we don''t know
we''ll all be able to
> get into the same transaction so that''s what we have had to do. 
But the global
> reserve holds a reservation large enough to cover a large percentage of all
the
> metadata currently in the fs.  So all we really need to account for is any
new
> blocks that we may allocate.  So fix this by
> 
> 1) Passing to btrfs_alloc_free_block() wether this is a new block or a COW
> block.  If it is a COW block we use the global reserve, if not we use the
> trans->block_rsv.
> 2) Reduce the amount of space we reserve.  Since we don''t need to
account for
> cow''ing the tree we can just keep track of new blocks to reserve,
which greatly
> reduces the reservation amount.
> 
> This makes my basic random write test go from 3 mb/s to 75 mb/s. 
I''ve tested
> this with my horrible ENOSPC test and it seems to work out fine.  Thanks,
> 
> Signed-off-by: Josef Bacik <josef@redhat.com>
> ---
> V1->V2:
> -fix a problem reported by Liubo, we need to make sure that we move bytes
> over for any new extents we may add to the extent tree so we don''t
get a bunch
> of warnings.
> -fix the global reserve to reserve 50% of the metadata space currently
used.
Argh helps if I actually send the updated patch, sorry!


---
 fs/btrfs/ctree.c       |   10 +++++-----
 fs/btrfs/ctree.h       |    5 ++---
 fs/btrfs/disk-io.c     |    3 ++-
 fs/btrfs/extent-tree.c |   31 ++++++++++++++++++++++++-------
 fs/btrfs/ioctl.c       |    2 +-
 5 files changed, 34 insertions(+), 17 deletions(-)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 2e66786..fbd48e9 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -206,7 +206,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,

 	cow = btrfs_alloc_free_block(trans, root, buf->len, 0,
 				     new_root_objectid, &disk_key, level,
-				     buf->start, 0);
+				     buf->start, 0, 1);
 	if (IS_ERR(cow))
 		return PTR_ERR(cow);

@@ -412,7 +412,7 @@ static noinline int __btrfs_cow_block(struct
btrfs_trans_handle *trans,

 	cow = btrfs_alloc_free_block(trans, root, buf->len, parent_start,
 				     root->root_key.objectid, &disk_key,
-				     level, search_start, empty_size);
+				     level, search_start, empty_size, 0);
 	if (IS_ERR(cow))
 		return PTR_ERR(cow);

@@ -1985,7 +1985,7 @@ static noinline int insert_new_root(struct
btrfs_trans_handle *trans,

 	c = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
 				   root->root_key.objectid, &lower_key,
-				   level, root->node->start, 0);
+				   level, root->node->start, 0, 1);
 	if (IS_ERR(c))
 		return PTR_ERR(c);

@@ -2112,7 +2112,7 @@ static noinline int split_node(struct
btrfs_trans_handle *trans,

 	split = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
 					root->root_key.objectid,
-					&disk_key, level, c->start, 0);
+					&disk_key, level, c->start, 0, 1);
 	if (IS_ERR(split))
 		return PTR_ERR(split);

@@ -2937,7 +2937,7 @@ again:

 	right = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
 					root->root_key.objectid,
-					&disk_key, 0, l->start, 0);
+					&disk_key, 0, l->start, 0, 1);
 	if (IS_ERR(right))
 		return PTR_ERR(right);

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3ba4d5f..1accb56 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2135,8 +2135,7 @@ static inline bool btrfs_mixed_space_info(struct
btrfs_space_info *space_info)
 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
 						 unsigned num_items)
 {
-	return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
-		3 * num_items;
+	return root->leafsize * 3 * num_items;
 }

 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
@@ -2161,7 +2160,7 @@ struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 					struct btrfs_root *root, u32 blocksize,
 					u64 parent, u64 root_objectid,
 					struct btrfs_disk_key *key, int level,
-					u64 hint, u64 empty_size);
+					u64 hint, u64 empty_size, int new_block);
 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 			   struct btrfs_root *root,
 			   struct extent_buffer *buf,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 234a084..0245cad 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1143,7 +1143,8 @@ static struct btrfs_root *alloc_log_tree(struct
btrfs_trans_handle *trans,
 	root->ref_cows = 0;

 	leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
-				      BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0);
+				      BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0,
+				      1);
 	if (IS_ERR(leaf)) {
 		kfree(root);
 		return ERR_CAST(leaf);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2e0f87b..1011bcb 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3779,7 +3779,7 @@ static u64 calc_global_metadata_size(struct
btrfs_fs_info *fs_info)

 	num_bytes = (data_used >> fs_info->sb->s_blocksize_bits) *
 		    csum_size * 2;
-	num_bytes += div64_u64(data_used + meta_used, 50);
+	num_bytes += div_factor(data_used + meta_used, 5);

 	if (num_bytes * 3 > meta_used)
 		num_bytes = div64_u64(meta_used, 3);
@@ -5552,10 +5552,17 @@ int btrfs_alloc_reserved_file_extent(struct
btrfs_trans_handle *trans,
 				     u64 root_objectid, u64 owner,
 				     u64 offset, struct btrfs_key *ins)
 {
+	struct btrfs_block_rsv *block_rsv = get_block_rsv(trans, root);
+	struct btrfs_block_rsv *global_rsv =
&root->fs_info->global_block_rsv;
 	int ret;

 	BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID);
-
+	if (block_rsv != global_rsv) {
+		u64 num_bytes = btrfs_calc_trans_metadata_size(root, 1);
+		ret = btrfs_block_rsv_migrate(block_rsv, global_rsv,
+					      num_bytes);
+		WARN_ON(ret);
+	}
 	ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset,
 					 0, root_objectid, owner, offset,
 					 BTRFS_ADD_DELAYED_EXTENT, NULL);
@@ -5661,13 +5668,23 @@ struct extent_buffer
*btrfs_init_new_buffer(struct btrfs_trans_handle *trans,

 static struct btrfs_block_rsv *
 use_block_rsv(struct btrfs_trans_handle *trans,
-	      struct btrfs_root *root, u32 blocksize)
+	      struct btrfs_root *root, u32 blocksize, int new_block)
 {
-	struct btrfs_block_rsv *block_rsv;
+	struct btrfs_block_rsv *block_rsv = NULL;
 	struct btrfs_block_rsv *global_rsv =
&root->fs_info->global_block_rsv;
 	int ret;

-	block_rsv = get_block_rsv(trans, root);
+	if (root->ref_cows) {
+		if (new_block)
+			block_rsv = trans->block_rsv;
+		else
+			block_rsv = global_rsv;
+	} else {
+		block_rsv = root->block_rsv;
+	}
+
+	if (!block_rsv)
+		block_rsv = &root->fs_info->empty_block_rsv;

 	if (block_rsv->size == 0) {
 		ret = reserve_metadata_bytes(trans, root, block_rsv,
@@ -5726,7 +5743,7 @@ struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 					struct btrfs_root *root, u32 blocksize,
 					u64 parent, u64 root_objectid,
 					struct btrfs_disk_key *key, int level,
-					u64 hint, u64 empty_size)
+					u64 hint, u64 empty_size, int new_block)
 {
 	struct btrfs_key ins;
 	struct btrfs_block_rsv *block_rsv;
@@ -5735,7 +5752,7 @@ struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 	int ret;


-	block_rsv = use_block_rsv(trans, root, blocksize);
+	block_rsv = use_block_rsv(trans, root, blocksize, new_block);
 	if (IS_ERR(block_rsv))
 		return ERR_CAST(block_rsv);

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index fd252ff..39fb634 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -352,7 +352,7 @@ static noinline int create_subvol(struct btrfs_root
*root,
 	}

 	leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
-				      0, objectid, NULL, 0, 0, 0);
+				      0, objectid, NULL, 0, 0, 0, 1);
 	if (IS_ERR(leaf)) {
 		ret = PTR_ERR(leaf);
 		goto fail;
-- 
1.7.5.2

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Christian Brunner

2011-Jul-21 14:12 UTC

head link

Re: [PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2

2011/7/18 Josef Bacik <josef@redhat.com>:> On 07/18/2011 02:11 PM, Josef Bacik wrote:
>> Currently we reserve enough space to COW an entirely full btree for
every extent
>> we have reserved for an inode.  This _sucks_, because you only need to
COW once,
>> and then everybody else is ok.  Unfortunately we don''t know
we''ll all be able to
>> get into the same transaction so that''s what we have had to
do.  But the global
>> reserve holds a reservation large enough to cover a large percentage of
all the
>> metadata currently in the fs.  So all we really need to account for is
any new
>> blocks that we may allocate.  So fix this by
>>
>> 1) Passing to btrfs_alloc_free_block() wether this is a new block or a
COW
>> block.  If it is a COW block we use the global reserve, if not we use
the
>> trans->block_rsv.
>> 2) Reduce the amount of space we reserve.  Since we don''t need
to account for
>> cow''ing the tree we can just keep track of new blocks to
reserve, which greatly
>> reduces the reservation amount.
>>
>> This makes my basic random write test go from 3 mb/s to 75 mb/s.
 I''ve tested
>> this with my horrible ENOSPC test and it seems to work out fine.
 Thanks,
>>
>> Signed-off-by: Josef Bacik <josef@redhat.com>
>> ---
>> V1->V2:
>> -fix a problem reported by Liubo, we need to make sure that we move
bytes
>> over for any new extents we may add to the extent tree so we
don''t get a bunch
>> of warnings.
>> -fix the global reserve to reserve 50% of the metadata space currently
used.
When I run this patch I get a lot of messages like these (V1 seemed to
run fine).

Regards,
Christian

Jul 21 15:25:59 os00 kernel: [   35.411360] ------------[ cut here ]------------
Jul 21 15:25:59 os00 kernel: [   35.416589] WARNING: at
fs/btrfs/extent-tree.c:5564
btrfs_alloc_reserved_file_extent+0xf8/0x100 [btrfs]()
Jul 21 15:25:59 os00 kernel: [   35.427311] Hardware name: ProLiant DL180 G6
Jul 21 15:25:59 os00 kernel: [   35.432326] Modules linked in: btrfs
zlib_deflate libcrc32c bonding ipv6 serio_raw pcspkr ghes hed iTCO_wdt
iTCO_vendor_support ixgbe dca mdio i7core_edac edac_core
iomemory_vsl(P) hpsa squashfs usb_storage [last unloaded:
scsi_wait_scan]
Jul 21 15:25:59 os00 kernel: [   35.456799] Pid: 1876, comm:
btrfs-endio-wri Tainted: P            3.0.0-1.fits.4.el6.x86_64 #1
Jul 21 15:25:59 os00 kernel: [   35.466610] Call Trace:
Jul 21 15:25:59 os00 kernel: [   35.469497]  [<ffffffff8106306f>]
warn_slowpath_common+0x7f/0xc0
Jul 21 15:25:59 os00 kernel: [   35.476254]  [<ffffffff810630ca>]
warn_slowpath_null+0x1a/0x20
Jul 21 15:25:59 os00 kernel: [   35.482839]  [<ffffffffa02227f8>]
btrfs_alloc_reserved_file_extent+0xf8/0x100 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.491683]  [<ffffffffa023d871>]
insert_reserved_file_extent.clone.0+0x201/0x270 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.500912]  [<ffffffffa023debb>]
btrfs_finish_ordered_io+0x2eb/0x360 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.508978]  [<ffffffff81073841>] ?
try_to_del_timer_sync+0x81/0xe0
Jul 21 15:25:59 os00 kernel: [   35.516081]  [<ffffffffa023df7c>]
btrfs_writepage_end_io_hook+0x4c/0xa0 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.524340]  [<ffffffffa0277846>]
end_compressed_bio_write+0x86/0xf0 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.532259]  [<ffffffff8118f0cd>]
bio_endio+0x1d/0x40
Jul 21 15:25:59 os00 kernel: [   35.538034]  [<ffffffffa0232654>]
end_workqueue_fn+0xf4/0x130 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.545384]  [<ffffffffa0265e7e>]
worker_loop+0x13e/0x540 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.552307]  [<ffffffffa0265d40>] ?
btrfs_queue_worker+0x2d0/0x2d0 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.560039]  [<ffffffffa0265d40>] ?
btrfs_queue_worker+0x2d0/0x2d0 [btrfs]
Jul 21 15:25:59 os00 kernel: [   35.567768]  [<ffffffff81085836>]
kthread+0x96/0xa0
Jul 21 15:25:59 os00 kernel: [   35.573275]  [<ffffffff81562b84>]
kernel_thread_helper+0x4/0x10
Jul 21 15:25:59 os00 kernel: [   35.579931]  [<ffffffff810857a0>] ?
kthread_worker_fn+0x1a0/0x1a0
Jul 21 15:25:59 os00 kernel: [   35.586816]  [<ffffffff81562b80>] ?
gs_change+0x13/0x13
Jul 21 15:25:59 os00 kernel: [   35.592779] ---[ end trace d87e2733f1e978b8 ]---
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Btrfs devel - Jul 2011 - [PATCH] Btrfs: don't be as agressive with delalloc metadata reservations V2

[PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2

Re: [PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2

Re: [PATCH] Btrfs: don''t be as agressive with delalloc metadata reservations V2