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btrfs: cow_file_range() num_bytes and disk_num_bytes are same

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[ Upstream commit 3752d22fcea160cc2493e34f5e0e41cdd7fdd921 ]

This patch deletes local variable disk_num_bytes as its value
is same as num_bytes in the function cow_file_range().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anand Jain 2018-02-15 12:29:38 +08:00 committed by Greg Kroah-Hartman
parent a39010dcd3
commit 8714d9b4ae
1 changed files with 8 additions and 9 deletions
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17
fs/btrfs/inode.c
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@ -947,7 +947,6 @@ static noinline int cow_file_range(struct inode *inode,
u64 alloc_hint = 0;
u64 num_bytes;
unsigned long ram_size;
u64 disk_num_bytes;
u64 cur_alloc_size;
u64 blocksize = root->sectorsize;
struct btrfs_key ins;
@ -963,7 +962,6 @@ static noinline int cow_file_range(struct inode *inode,
num_bytes = ALIGN(end - start + 1, blocksize);
num_bytes = max(blocksize, num_bytes);
disk_num_bytes = num_bytes;
/* if this is a small write inside eof, kick off defrag */
if (num_bytes < SZ_64K &&
@ -992,16 +990,15 @@ static noinline int cow_file_range(struct inode *inode,
}
}
BUG_ON(disk_num_bytes >
btrfs_super_total_bytes(root->fs_info->super_copy));
BUG_ON(num_bytes > btrfs_super_total_bytes(root->fs_info->super_copy));
alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
while (disk_num_bytes > 0) {
while (num_bytes > 0) {
unsigned long op;
cur_alloc_size = disk_num_bytes;
cur_alloc_size = num_bytes;
ret = btrfs_reserve_extent(root, cur_alloc_size, cur_alloc_size,
root->sectorsize, 0, alloc_hint,
&ins, 1, 1);
@ -1058,7 +1055,7 @@ static noinline int cow_file_range(struct inode *inode,
btrfs_dec_block_group_reservations(root->fs_info, ins.objectid);
if (disk_num_bytes < cur_alloc_size)
if (num_bytes < cur_alloc_size)
break;
/* we're not doing compressed IO, don't unlock the first
@ -1076,8 +1073,10 @@ static noinline int cow_file_range(struct inode *inode,
delalloc_end, locked_page,
EXTENT_LOCKED | EXTENT_DELALLOC,
op);
disk_num_bytes -= cur_alloc_size;
num_bytes -= cur_alloc_size;
if (num_bytes < cur_alloc_size)
num_bytes = 0;
else
num_bytes -= cur_alloc_size;
alloc_hint = ins.objectid + ins.offset;
start += cur_alloc_size;
}