From: Anand Jain Anand.Jain@oracle.com
[ 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 --- fs/btrfs/inode.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 972475eeb2dd0..ef8ed0cd8075a 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -926,7 +926,6 @@ 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; @@ -942,7 +941,6 @@ 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 < 64 * 1024 && @@ -969,16 +967,15 @@ 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, root->sectorsize, 0, alloc_hint, &ins, 1, 1); @@ -1033,7 +1030,7 @@ static noinline int cow_file_range(struct inode *inode, goto out_drop_extent_cache; }
- 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 @@ -1050,8 +1047,10 @@ static noinline int cow_file_range(struct inode *inode, start + ram_size - 1, 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; }