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btrfs: sysfs: export currently running exclusive operation

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/sys/fs/<fsid>/exclusive_operation contains the currently executing
exclusive operation. Add a sysfs_notify() when operation end, so
userspace can be notified of exclusive operation is finished.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Goldwyn Rodrigues 2020-08-25 10:02:33 -05:00 committed by David Sterba
parent c3e1f96c37
commit 66a2823c54
2 changed files with 38 additions and 0 deletions
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1
fs/btrfs/ioctl.c
View File

@ -387,6 +387,7 @@ bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
{
WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
}
/*

37
fs/btrfs/sysfs.c
View File

@ -809,6 +809,42 @@ static ssize_t btrfs_checksum_show(struct kobject *kobj,
BTRFS_ATTR(, checksum, btrfs_checksum_show);
static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
struct kobj_attribute *a, char *buf)
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
const char *str;
switch (READ_ONCE(fs_info->exclusive_operation)) {
case BTRFS_EXCLOP_NONE:
str = "none\n";
break;
case BTRFS_EXCLOP_BALANCE:
str = "balance\n";
break;
case BTRFS_EXCLOP_DEV_ADD:
str = "device add\n";
break;
case BTRFS_EXCLOP_DEV_REMOVE:
str = "device remove\n";
break;
case BTRFS_EXCLOP_DEV_REPLACE:
str = "device replace\n";
break;
case BTRFS_EXCLOP_RESIZE:
str = "resize\n";
break;
case BTRFS_EXCLOP_SWAP_ACTIVATE:
str = "swap activate\n";
break;
default:
str = "UNKNOWN\n";
break;
}
return scnprintf(buf, PAGE_SIZE, "%s", str);
}
BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, label),
BTRFS_ATTR_PTR(, nodesize),
@ -817,6 +853,7 @@ static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, quota_override),
BTRFS_ATTR_PTR(, metadata_uuid),
BTRFS_ATTR_PTR(, checksum),
BTRFS_ATTR_PTR(, exclusive_operation),
NULL,
};