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

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