We need get write access for qgroup operations, or we will modify the R/O fs.
Signed-off-by: Miao Xie <[email protected]> --- fs/btrfs/ioctl.c | 73 +++++++++++++++++++++++++++++++++++++------------------- 1 file changed, 48 insertions(+), 25 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index a7afafa..e6525d1 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3481,8 +3481,9 @@ out: return ret; } -static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_quota_ctl_args *sa; struct btrfs_trans_handle *trans = NULL; int ret; @@ -3491,12 +3492,15 @@ static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { trans = btrfs_start_transaction(root, 2); @@ -3529,14 +3533,16 @@ static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) if (err && !ret) ret = err; } - out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } -static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_qgroup_assign_args *sa; struct btrfs_trans_handle *trans; int ret; @@ -3545,12 +3551,15 @@ static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) { @@ -3573,11 +3582,14 @@ static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } -static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_qgroup_create_args *sa; struct btrfs_trans_handle *trans; int ret; @@ -3586,12 +3598,15 @@ static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) { @@ -3613,11 +3628,14 @@ static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } -static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_qgroup_limit_args *sa; struct btrfs_trans_handle *trans; int ret; @@ -3627,12 +3645,15 @@ static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) { @@ -3655,6 +3676,8 @@ static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } @@ -3830,13 +3853,13 @@ long btrfs_ioctl(struct file *file, unsigned int case BTRFS_IOC_GET_DEV_STATS: return btrfs_ioctl_get_dev_stats(root, argp); case BTRFS_IOC_QUOTA_CTL: - return btrfs_ioctl_quota_ctl(root, argp); + return btrfs_ioctl_quota_ctl(file, argp); case BTRFS_IOC_QGROUP_ASSIGN: - return btrfs_ioctl_qgroup_assign(root, argp); + return btrfs_ioctl_qgroup_assign(file, argp); case BTRFS_IOC_QGROUP_CREATE: - return btrfs_ioctl_qgroup_create(root, argp); + return btrfs_ioctl_qgroup_create(file, argp); case BTRFS_IOC_QGROUP_LIMIT: - return btrfs_ioctl_qgroup_limit(root, argp); + return btrfs_ioctl_qgroup_limit(file, argp); } return -ENOTTY; -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
