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bcachefs: support get fs label

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Implement support for FS_IOC_GETFSLABEL ioctl to read filesystem
label.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Hongbo Li
2024-06-03 21:26:19 +08:00
committed by Kent Overstreet
parent 8a4ef7e28a
commit 81bce3cf2b
1 changed files with 30 additions and 0 deletions
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30
fs/bcachefs/fs-ioctl.c
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@@ -277,6 +277,30 @@ static int bch2_ioc_getversion(struct bch_inode_info *inode, u32 __user *arg)
return put_user(inode->v.i_generation, arg);
}
static int bch2_ioc_getlabel(struct bch_fs *c, char __user *user_label)
{
int ret;
size_t len;
char label[BCH_SB_LABEL_SIZE];
BUILD_BUG_ON(BCH_SB_LABEL_SIZE >= FSLABEL_MAX);
mutex_lock(&c->sb_lock);
memcpy(label, c->disk_sb.sb->label, BCH_SB_LABEL_SIZE);
mutex_unlock(&c->sb_lock);
len = strnlen(label, BCH_SB_LABEL_SIZE);
if (len == BCH_SB_LABEL_SIZE) {
bch_warn(c,
"label is too long, return the first %zu bytes",
--len);
}
ret = copy_to_user(user_label, label, len);
return ret ? -EFAULT : 0;
}
static int bch2_ioc_goingdown(struct bch_fs *c, u32 __user *arg)
{
u32 flags;
@@ -511,6 +535,10 @@ long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg)
ret = -ENOTTY;
break;
case FS_IOC_GETFSLABEL:
ret = bch2_ioc_getlabel(c, (void __user *) arg);
break;
case FS_IOC_GOINGDOWN:
ret = bch2_ioc_goingdown(c, (u32 __user *) arg);
break;
@@ -555,6 +583,8 @@ long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
case FS_IOC32_GETVERSION:
cmd = FS_IOC_GETVERSION;
break;
case FS_IOC_GETFSLABEL:
break;
default:
return -ENOIOCTLCMD;
}