diff options
| -rw-r--r-- | fs/btrfs/ioctl.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 4482cf35522e..80fe3c654612 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2928,8 +2928,14 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp) ret = btrfs_defrag_root(root); break; case S_IFREG: - if (!(file->f_mode & FMODE_WRITE)) { - ret = -EINVAL; + /* + * Note that this does not check the file descriptor for write + * access. This prevents defragmenting executables that are + * running and allows defrag on files open in read-only mode. + */ + if (!capable(CAP_SYS_ADMIN) && + inode_permission(inode, MAY_WRITE)) { + ret = -EPERM; goto out; } |