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btrfs: eliminate insert label in add_falloc_range 

By way of inverting the list_empty conditional the insert label can be
eliminated, making the function's flow entirely linear.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2021-06-01 09:08:15 +03:00 committed by David Sterba
parent 3d078efae6
commit 77d255348b
1 changed files with 11 additions and 12 deletions
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23
fs/btrfs/file.c
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@ -3050,19 +3050,18 @@ static int add_falloc_range(struct list_head *head, u64 start, u64 len)
{
struct falloc_range *range = NULL;
if (list_empty(head))
goto insert;
/*
* As fallocate iterate by bytenr order, we only need to check
* the last range.
*/
range = list_last_entry(head, struct falloc_range, list);
if (range->start + range->len == start) {
range->len += len;
return 0;
if (!list_empty(head)) {
/*
* As fallocate iterates by bytenr order, we only need to check
* the last range.
*/
range = list_last_entry(head, struct falloc_range, list);
if (range->start + range->len == start) {
range->len += len;
return 0;
}
}
insert:
range = kmalloc(sizeof(*range), GFP_KERNEL);
if (!range)
return -ENOMEM;