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ext4: refactor ext4_free_blocks() to pull out ext4_mb_clear_bb() 

ext4_free_blocks() function became too long and confusing, this patch
just pulls out the ext4_mb_clear_bb() function logic from it
which clears the block bitmap and frees it.

No functionality change in this patch

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/22c30fbb26ba409cf8aa5f0c7912970272c459e8.1644992610.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ritesh Harjani 2022-02-16 12:32:45 +05:30 committed by Theodore Ts'o
parent bfdc502a4a
commit 8ac3939db9
1 changed files with 102 additions and 78 deletions
fs/ext4
mballoc.c

180
fs/ext4/mballoc.c
View File

@ -5872,7 +5872,8 @@ static void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
}
/**
* ext4_free_blocks() -- Free given blocks and update quota
* ext4_mb_clear_bb() -- helper function for freeing blocks.
* Used by ext4_free_blocks()
* @handle: handle for this transaction
* @inode: inode
* @bh: optional buffer of the block to be freed
@ -5880,9 +5881,9 @@ static void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
* @count: number of blocks to be freed
* @flags: flags used by ext4_free_blocks
*/
void ext4_free_blocks(handle_t *handle, struct inode *inode,
struct buffer_head *bh, ext4_fsblk_t block,
unsigned long count, int flags)
static void ext4_mb_clear_bb(handle_t *handle, struct inode *inode,
ext4_fsblk_t block, unsigned long count,
int flags)
{
struct buffer_head *bitmap_bh = NULL;
struct super_block *sb = inode->i_sb;
@ -5899,80 +5900,6 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
sbi = EXT4_SB(sb);
if (sbi->s_mount_state & EXT4_FC_REPLAY) {
ext4_free_blocks_simple(inode, block, count);
return;
}
might_sleep();
if (bh) {
if (block)
BUG_ON(block != bh->b_blocknr);
else
block = bh->b_blocknr;
}
if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) &&
!ext4_inode_block_valid(inode, block, count)) {
ext4_error(sb, "Freeing blocks not in datazone - "
"block = %llu, count = %lu", block, count);
goto error_return;
}
ext4_debug("freeing block %llu\n", block);
trace_ext4_free_blocks(inode, block, count, flags);
if (bh && (flags & EXT4_FREE_BLOCKS_FORGET)) {
BUG_ON(count > 1);
ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA,
inode, bh, block);
}
/*
* If the extent to be freed does not begin on a cluster
* boundary, we need to deal with partial clusters at the
* beginning and end of the extent. Normally we will free
* blocks at the beginning or the end unless we are explicitly
* requested to avoid doing so.
*/
overflow = EXT4_PBLK_COFF(sbi, block);
if (overflow) {
if (flags & EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER) {
overflow = sbi->s_cluster_ratio - overflow;
block += overflow;
if (count > overflow)
count -= overflow;
else
return;
} else {
block -= overflow;
count += overflow;
}
}
overflow = EXT4_LBLK_COFF(sbi, count);
if (overflow) {
if (flags & EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER) {
if (count > overflow)
count -= overflow;
else
return;
} else
count += sbi->s_cluster_ratio - overflow;
}
if (!bh && (flags & EXT4_FREE_BLOCKS_FORGET)) {
int i;
int is_metadata = flags & EXT4_FREE_BLOCKS_METADATA;
for (i = 0; i < count; i++) {
cond_resched();
if (is_metadata)
bh = sb_find_get_block(inode->i_sb, block + i);
ext4_forget(handle, is_metadata, inode, bh, block + i);
}
}
do_more:
overflow = 0;
ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
@ -6140,6 +6067,103 @@ error_return:
return;
}
/**
* ext4_free_blocks() -- Free given blocks and update quota
* @handle: handle for this transaction
* @inode: inode
* @bh: optional buffer of the block to be freed
* @block: starting physical block to be freed
* @count: number of blocks to be freed
* @flags: flags used by ext4_free_blocks
*/
void ext4_free_blocks(handle_t *handle, struct inode *inode,
struct buffer_head *bh, ext4_fsblk_t block,
unsigned long count, int flags)
{
struct super_block *sb = inode->i_sb;
unsigned int overflow;
struct ext4_sb_info *sbi;
sbi = EXT4_SB(sb);
if (sbi->s_mount_state & EXT4_FC_REPLAY) {
ext4_free_blocks_simple(inode, block, count);
return;
}
might_sleep();
if (bh) {
if (block)
BUG_ON(block != bh->b_blocknr);
else
block = bh->b_blocknr;
}
if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) &&
!ext4_inode_block_valid(inode, block, count)) {
ext4_error(sb, "Freeing blocks not in datazone - "
"block = %llu, count = %lu", block, count);
return;
}
ext4_debug("freeing block %llu\n", block);
trace_ext4_free_blocks(inode, block, count, flags);
if (bh && (flags & EXT4_FREE_BLOCKS_FORGET)) {
BUG_ON(count > 1);
ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA,
inode, bh, block);
}
/*
* If the extent to be freed does not begin on a cluster
* boundary, we need to deal with partial clusters at the
* beginning and end of the extent. Normally we will free
* blocks at the beginning or the end unless we are explicitly
* requested to avoid doing so.
*/
overflow = EXT4_PBLK_COFF(sbi, block);
if (overflow) {
if (flags & EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER) {
overflow = sbi->s_cluster_ratio - overflow;
block += overflow;
if (count > overflow)
count -= overflow;
else
return;
} else {
block -= overflow;
count += overflow;
}
}
overflow = EXT4_LBLK_COFF(sbi, count);
if (overflow) {
if (flags & EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER) {
if (count > overflow)
count -= overflow;
else
return;
} else
count += sbi->s_cluster_ratio - overflow;
}
if (!bh && (flags & EXT4_FREE_BLOCKS_FORGET)) {
int i;
int is_metadata = flags & EXT4_FREE_BLOCKS_METADATA;
for (i = 0; i < count; i++) {
cond_resched();
if (is_metadata)
bh = sb_find_get_block(inode->i_sb, block + i);
ext4_forget(handle, is_metadata, inode, bh, block + i);
}
}
ext4_mb_clear_bb(handle, inode, block, count, flags);
return;
}
/**
* ext4_group_add_blocks() -- Add given blocks to an existing group
* @handle: handle to this transaction