diff options
| author | Hongbo Li <lihongbo22@huawei.com> | 2024-06-03 21:26:19 +0800 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-07-14 19:00:15 -0400 |
| commit | 81bce3cf2b2b4adcba4eda58fb3ebc4082b13fb3 (patch) | |
| tree | 903cf4d9eceea7b625266680593fedb770eff535 | |
| parent | 8a4ef7e28abade861d894e25b167988c5b8977a7 (diff) | |
bcachefs: support get fs label
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>
| -rw-r--r-- | fs/bcachefs/fs-ioctl.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/bcachefs/fs-ioctl.c b/fs/bcachefs/fs-ioctl.c index add90172b475..c82c25e7f45a 100644 --- a/fs/bcachefs/fs-ioctl.c +++ b/fs/bcachefs/fs-ioctl.c @@ -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; } |