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Date: Tue, 2 Sep 2014 18:05:48 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 2/3] ext4: prepare to drop EXT4_STATE_DELALLOC_RESERVED
The EXT4_STATE_DELALLOC_RESERVED flag was originally implemented
because it was too hard to make sure mballoc and get_block flags could
be reliably passed down through all of the codepaths that end up
calling ext4_mb_new_blocks().
Since then, we have mb_flags passed down through most of the code
paths, so getting rid of EXT4_STATE_DELALLOC_RESERVED isn't as tricky
as it used to.
This commit plumbs in the last of what is required, and then adds a
WARN_ON check to make sure we haven't missed anything. If this passes
a full regression test run, we can then drop
EXT4_STATE_DELALLOC_RESERVED.
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
fs/ext4/balloc.c | 3 +--
fs/ext4/extents.c | 6 +++++-
fs/ext4/indirect.c | 6 +++++-
fs/ext4/mballoc.c | 10 ++++++----
fs/ext4/xattr.c | 6 ------
5 files changed, 17 insertions(+), 14 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 581ef40..d70f154 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -636,8 +636,7 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
* Account for the allocated meta blocks. We will never
* fail EDQUOT for metdata, but we do account for it.
*/
- if (!(*errp) &&
- ext4_test_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED)) {
+ if (!(*errp) && (flags & EXT4_MB_DELALLOC_RESERVED)) {
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
dquot_alloc_block_nofail(inode,
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3ac1686..8170b32 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1933,6 +1933,8 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
ext4_lblk_t next;
int mb_flags = 0, unwritten;
+ if (gb_flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+ mb_flags |= EXT4_MB_DELALLOC_RESERVED;
if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
return -EIO;
@@ -2054,7 +2056,7 @@ prepend:
* We're gonna add a new leaf in the tree.
*/
if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
- mb_flags = EXT4_MB_USE_RESERVED;
+ mb_flags |= EXT4_MB_USE_RESERVED;
err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
ppath, newext);
if (err)
@@ -4438,6 +4440,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
ar.flags = 0;
if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
ar.flags |= EXT4_MB_HINT_NOPREALLOC;
+ if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+ ar.flags |= EXT4_MB_DELALLOC_RESERVED;
newblock = ext4_mb_new_blocks(handle, &ar, &err);
if (!newblock)
goto out2;
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 69af0cd..36b3696 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -333,7 +333,9 @@ static int ext4_alloc_branch(handle_t *handle,
new_blocks[i] = ext4_mb_new_blocks(handle, ar, &err);
} else
ar->goal = new_blocks[i] = ext4_new_meta_blocks(handle,
- ar->inode, ar->goal, 0, NULL, &err);
+ ar->inode, ar->goal,
+ ar->flags & EXT4_MB_DELALLOC_RESERVED,
+ NULL, &err);
if (err) {
i--;
goto failed;
@@ -572,6 +574,8 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
ar.logical = map->m_lblk;
if (S_ISREG(inode->i_mode))
ar.flags = EXT4_MB_HINT_DATA;
+ if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+ ar.flags |= EXT4_MB_DELALLOC_RESERVED;
ar.goal = ext4_find_goal(inode, map->m_lblk, partial);
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8b0f9ef..15dffda 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4415,9 +4415,12 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
* EDQUOT check, as blocks and quotas have been already
* reserved when data being copied into pagecache.
*/
- if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED))
+ if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED)) {
+ WARN_ON((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0);
ar->flags |= EXT4_MB_DELALLOC_RESERVED;
- else {
+ }
+
+ if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) {
/* Without delayed allocation we need to verify
* there is enough free blocks to do block allocation
* and verify allocation doesn't exceed the quota limits.
@@ -4528,8 +4531,7 @@ out:
if (inquota && ar->len < inquota)
dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len));
if (!ar->len) {
- if (!ext4_test_inode_state(ar->inode,
- EXT4_STATE_DELALLOC_RESERVED))
+ if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0)
/* release all the reserved blocks if non delalloc */
percpu_counter_sub(&sbi->s_dirtyclusters_counter,
reserv_clstrs);
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index e738733..da4df70 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -899,14 +899,8 @@ inserted:
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
- /*
- * take i_data_sem because we will test
- * i_delalloc_reserved_flag in ext4_mb_new_blocks
- */
- down_read(&EXT4_I(inode)->i_data_sem);
block = ext4_new_meta_blocks(handle, inode, goal, 0,
NULL, &error);
- up_read((&EXT4_I(inode)->i_data_sem));
if (error)
goto cleanup;
--
2.1.0
--
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