diff options
| author | Hongbo Li <lihongbo22@huawei.com> | 2024-06-03 21:26:20 +0800 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-07-14 19:00:15 -0400 |
| commit | 7a254053a59008913247606d0ce4a0a8b61fe6ee (patch) | |
| tree | b60e6f06dd19f9b8394e274d8ddd33f80b8f3965 /fs | |
| parent | 81bce3cf2b2b4adcba4eda58fb3ebc4082b13fb3 (diff) | |
bcachefs: support FS_IOC_SETFSLABEL
Implement support for FS_IOC_SETFSLABEL ioctl to set filesystem
label.
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/bcachefs/fs-ioctl.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/bcachefs/fs-ioctl.c b/fs/bcachefs/fs-ioctl.c index c82c25e7f45a..aea8132d2c40 100644 --- a/fs/bcachefs/fs-ioctl.c +++ b/fs/bcachefs/fs-ioctl.c @@ -301,6 +301,41 @@ static int bch2_ioc_getlabel(struct bch_fs *c, char __user *user_label) return ret ? -EFAULT : 0; } +static int bch2_ioc_setlabel(struct bch_fs *c, + struct file *file, + struct bch_inode_info *inode, + const char __user *user_label) +{ + int ret; + char label[BCH_SB_LABEL_SIZE]; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (copy_from_user(label, user_label, sizeof(label))) + return -EFAULT; + + if (strnlen(label, BCH_SB_LABEL_SIZE) == BCH_SB_LABEL_SIZE) { + bch_err(c, + "unable to set label with more than %d bytes", + BCH_SB_LABEL_SIZE - 1); + return -EINVAL; + } + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + mutex_lock(&c->sb_lock); + strscpy(c->disk_sb.sb->label, label, BCH_SB_LABEL_SIZE); + mutex_unlock(&c->sb_lock); + + ret = bch2_write_super(c); + + mnt_drop_write_file(file); + return ret; +} + static int bch2_ioc_goingdown(struct bch_fs *c, u32 __user *arg) { u32 flags; @@ -539,6 +574,10 @@ long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg) ret = bch2_ioc_getlabel(c, (void __user *) arg); break; + case FS_IOC_SETFSLABEL: + ret = bch2_ioc_setlabel(c, file, inode, (const void __user *) arg); + break; + case FS_IOC_GOINGDOWN: ret = bch2_ioc_goingdown(c, (u32 __user *) arg); break; @@ -584,6 +623,7 @@ long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg) cmd = FS_IOC_GETVERSION; break; case FS_IOC_GETFSLABEL: + case FS_IOC_SETFSLABEL: break; default: return -ENOIOCTLCMD; |