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Date: Sun, 22 Nov 2009 21:18:26 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 4/8] ext4: fold ext4_free_blocks() and ext4_mb_free_blocks()
ext4_mb_free_blocks() is only called by ext4_free_blocks(), and the
latter function doesn't really do much. So merge the two functions
together, such that ext4_free_blocks() is now found in
fs/ext4/mballoc.c. This saves about 200 bytes of compiled text space.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/balloc.c | 38 --------------------------------------
fs/ext4/ext4.h | 7 +++----
fs/ext4/mballoc.c | 30 +++++++++++++++++++++++-------
3 files changed, 26 insertions(+), 49 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index f3032c9..22bc743 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -499,44 +499,6 @@ error_return:
}
/**
- * ext4_free_blocks() -- Free given blocks and update quota
- * @handle: handle for this transaction
- * @inode: inode
- * @block: start physical block to free
- * @count: number of blocks to count
- * @metadata: Are these metadata blocks
- */
-void ext4_free_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t block, unsigned long count,
- int metadata)
-{
- struct super_block *sb;
- unsigned long dquot_freed_blocks;
-
- /* this isn't the right place to decide whether block is metadata
- * inode.c/extents.c knows better, but for safety ... */
- if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
- metadata = 1;
-
- /* We need to make sure we don't reuse
- * block released untill the transaction commit.
- * writeback mode have weak data consistency so
- * don't force data as metadata when freeing block
- * for writeback mode.
- */
- if (metadata == 0 && !ext4_should_writeback_data(inode))
- metadata = 1;
-
- sb = inode->i_sb;
-
- ext4_mb_free_blocks(handle, inode, block, count,
- metadata, &dquot_freed_blocks);
- if (dquot_freed_blocks)
- vfs_dq_free_block(inode, dquot_freed_blocks);
- return;
-}
-
-/**
* ext4_has_free_blocks()
* @sbi: in-core super block structure.
* @nblocks: number of needed blocks
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 57c4e03..210e1b5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1325,8 +1325,6 @@ extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
-extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t block, unsigned long count, int metadata);
extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
ext4_fsblk_t block, unsigned long count);
extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
@@ -1385,8 +1383,9 @@ extern int ext4_mb_reserve_blocks(struct super_block *, int);
extern void ext4_discard_preallocations(struct inode *);
extern int __init init_ext4_mballoc(void);
extern void exit_ext4_mballoc(void);
-extern void ext4_mb_free_blocks(handle_t *, struct inode *,
- ext4_fsblk_t, unsigned long, int, unsigned long *);
+extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t block, unsigned long count,
+ int metadata);
extern int ext4_mb_add_groupinfo(struct super_block *sb,
ext4_group_t i, struct ext4_group_desc *desc);
extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6e5a23a..0dca90b 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4427,18 +4427,24 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
return 0;
}
-/*
- * Main entry point into mballoc to free blocks
+/**
+ * ext4_free_blocks() -- Free given blocks and update quota
+ * @handle: handle for this transaction
+ * @inode: inode
+ * @block: start physical block to free
+ * @count: number of blocks to count
+ * @metadata: Are these metadata blocks
*/
-void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t block, unsigned long count,
- int metadata, unsigned long *freed)
+void ext4_free_blocks(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t block, unsigned long count,
+ int metadata)
{
struct buffer_head *bitmap_bh = NULL;
struct super_block *sb = inode->i_sb;
struct ext4_allocation_context *ac = NULL;
struct ext4_group_desc *gdp;
struct ext4_super_block *es;
+ unsigned long freed = 0;
unsigned int overflow;
ext4_grpblk_t bit;
struct buffer_head *gd_bh;
@@ -4448,7 +4454,15 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
int err = 0;
int ret;
- *freed = 0;
+ /*
+ * We need to make sure we don't reuse the freed block until
+ * after the transaction is committed, which we can do by
+ * treating the block as metadata, below. We make an
+ * exception if the inode is to be written in writeback mode
+ * since writeback mode has weak data consistency guarantees.
+ */
+ if (!ext4_should_writeback_data(inode))
+ metadata = 1;
sbi = EXT4_SB(sb);
es = EXT4_SB(sb)->s_es;
@@ -4577,7 +4591,7 @@ do_more:
ext4_mb_release_desc(&e4b);
- *freed += count;
+ freed += count;
/* We dirtied the bitmap block */
BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
@@ -4597,6 +4611,8 @@ do_more:
}
sb->s_dirt = 1;
error_return:
+ if (freed)
+ vfs_dq_free_block(inode, freed);
brelse(bitmap_bh);
ext4_std_error(sb, err);
if (ac)
--
1.6.5.216.g5288a.dirty
--
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