On Wed 24-09-14 22:04:30, Li Xi wrote:
> This patch adds ioctl interface for setting/getting project of ext4.
One more thing...
> Signed-off-by: Li Xi <lixi@xxxxxxx>
> ---
> Documentation/filesystems/ext4.txt | 4 ++
> fs/ext4/ext4.h | 2 +
> fs/ext4/ioctl.c | 85 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 91 insertions(+), 0 deletions(-)
>
> + case EXT4_IOC_SETPROJECT:
> + {
> + __u32 projid;
> + int err;
> + handle_t *handle;
> + kprojid_t kprojid;
> + struct ext4_iloc iloc;
> + struct ext4_inode *raw_inode;
> +
> + struct dquot *transfer_to[EXT4_MAXQUOTAS] = { };
> +
> + /* Make sure caller can change project. */
> + if (!capable(CAP_SYS_ADMIN))
> + return -EACCES;
I realized you forgot to check EXT4_FEATURE_RO_COMPAT_PROJECT here...
Honza
> +
> + if (get_user(projid, (__u32 __user *) arg))
> + return -EFAULT;
> +
> + kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
> +
> + if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
> + return 0;
> +
> + err = mnt_want_write_file(filp);
> + if (err)
> + return err;
> +
> + err = -EPERM;
> + mutex_lock(&inode->i_mutex);
> + /* Is it quota file? Do not allow user to mess with it */
> + if (IS_NOQUOTA(inode))
> + goto project_out;
> +
> + dquot_initialize(inode);
> +
> + handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
> + EXT4_QUOTA_INIT_BLOCKS(sb) +
> + EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
> + if (IS_ERR(handle)) {
> + err = PTR_ERR(handle);
> + goto project_out;
> + }
> +
> + err = ext4_reserve_inode_write(handle, inode, &iloc);
> + if (err)
> + goto project_stop;
> +
> + raw_inode = ext4_raw_inode(&iloc);
> + if ((EXT4_INODE_SIZE(inode->i_sb) <=
> + EXT4_GOOD_OLD_INODE_SIZE) ||
> + (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid))) {
> + err = -EFBIG;
> + goto project_stop;
> + }
> +
> + transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
> + if (!transfer_to[PRJQUOTA])
> + goto project_set;
> +
> + err = __dquot_transfer(inode, transfer_to);
> + dqput(transfer_to[PRJQUOTA]);
> + if (err)
> + goto project_stop;
> +
> +project_set:
> + EXT4_I(inode)->i_projid = kprojid;
> + inode->i_ctime = ext4_current_time(inode);
> + err = ext4_mark_iloc_dirty(handle, inode, &iloc);
> +project_stop:
> + ext4_journal_stop(handle);
> +project_out:
> + mutex_unlock(&inode->i_mutex);
> + mnt_drop_write_file(filp);
> + return err;
> + }
> default:
> return -ENOTTY;
> }
> --
> 1.7.1
>
--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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