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btrfs: factor out reada loop in __reada_start_machine 

This is in preparation for moving fs_devices to proper lists.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2020-07-15 13:48:46 +03:00 committed by David Sterba
parent 1028d1c48b
commit dc0ab488d2
1 changed files with 15 additions and 5 deletions
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20
fs/btrfs/reada.c
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@ -767,15 +767,13 @@ static void reada_start_machine_worker(struct btrfs_work *work)
kfree(rmw);
}
static void __reada_start_machine(struct btrfs_fs_info *fs_info)
/* Try to start up to 10k READA requests for a group of devices */
static int reada_start_for_fsdevs(struct btrfs_fs_devices *fs_devices)
{
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
u64 enqueued;
u64 total = 0;
int i;
struct btrfs_device *device;
again:
do {
enqueued = 0;
mutex_lock(&fs_devices->device_list_mutex);
@ -787,6 +785,18 @@ again:
mutex_unlock(&fs_devices->device_list_mutex);
total += enqueued;
} while (enqueued && total < 10000);
return total;
}
static void __reada_start_machine(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
int i;
u64 enqueued = 0;
again:
enqueued += reada_start_for_fsdevs(fs_devices);
if (fs_devices->seed) {
fs_devices = fs_devices->seed;
goto again;